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2WAY VRF SYSTEM

Outdoor Unit Repair Procedures

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- 18

1

2

3

4

5

6

7

8

9

7. Charging Compressor Oil

2WAY VRF SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

High-pressure outlet port

(for ø5/16” (ø7.94mm)-

dia connector)

Type: 120, 144

Low-pressure outlet port

(for ø5/16” (ø7.94mm)-

dia connector)

Liquid tube service port

(for ø5/16” (ø7.94mm)-

dia connector)

Gas tube service port

(for ø5/16” (ø7.94mm)-

dia connector)

Fig. 11-b

Close

Close

Lower side

valve

Lo

Hi

Manifold

gauge

Upper side

valve

DPR

2WAY VRF SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

High-pressure outlet port

(for ø5/16” (ø7.94mm)-

dia connector)

Type: 72, 96

Low-pressure outlet port

(for ø5/16” (ø7.94mm)-

dia connector)

Liquid tube service port

(for ø5/16” (ø7.94mm)-

dia connector)

Gas tube service port

(for ø5/16” (ø7.94mm)-

dia connector)

Fig. 12

Procedure 2: Open

Procedure 1: Open

Procedure 3:

Open

Lower

side valve

Lo

Hi

Manifold

gauge

Upper side

valve

DPR

Next, follow the instructions in “4-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged,
and start cooling operation at all units. After the operating conditions were stabilized, open each valve (Hi-side

When this is done, the refrigerant pressure from operation forces the oil out of the oil charge tank, and oil is charged

into the outdoor unit from the low-pressure outlet port. Occasionally close the upper valve on the top of the oil charge

tank (only this valve) and shake the tank to check the amount of remaining oil.

1. Open the valve on the high-pressure side of the manifold gauge.
2. Open the upper valve.
3. Open the lower valve.

manifold gauge, upper valve and lower valve) in sequence as follows.

Operating valve

Close*

Open

Close

Hi-side

manifold gauge

Close

(No connection)

Close

(No connection)

Open

(Connect to refrigerant

recovery tank)

Lo-side

manifold gauge

Open

Open

Open

Upper valve

Oil charge completed

Oil charging

Refrigerant recovery

(oil-charging tank inside)

Process

Open

Close after approx.

60 seconds

Close

Lower valve

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

Completing oil-charging
To terminate the oil charging work, do as follows:

To end the charge process, first close the valve on the Hi-side manifold gauge. Then wait approximately 60

seconds in order to vaporize the refrigerant in the charge tank. Then fully close the lower valve.

Refrigerant recovery (oil-charging tank inside)
Finally, connect the refrigerant recovery unit to the Lo-side manifold gauge, shut down all indoor and outdoor units,

and then recover the remaining refrigerant in the oil-charging tank. Perform these procedures quickly and securely

so that no air can enter them. Then, charge the necessary amount of new refrigerant by referring to the “Installation

Instructions” that came with the outdoor unit.

SM830237-07_北米向け2WAY_VRF.indb 18

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Summary of Contents for U-120ME2U9

Page 1: ...Indoor Units Nominal Capacity U2 4 Way Cassette 36 x36 Indoor Unit Type Type S 12MY2U6 S 12MD1U6 S 12MF2U6 S 12MM2U6 S 09MD1U6 S 09MF2U6 S 09MM2U6 S 07MD1U6 S 09MY2U6 S 07MY2U6 S 12MU2U6 S 09MU2U6 S 07MU2U6 S 07MF2U6 S 07MM2U6 S 12MT2U6 S 12MK2U6 S 12MP1U6 S 12MR1U6 S 15MF2U6 S 15MM2U6 S 15MP1U6 S 15MR1U6 S 09MK2U6 S 09MP1U6 S 09MR1U6 S 07MK2U6 S 07MP1U6 S 07MR1U6 S 18MY2U6 S 18MF2U6 S 18MM2U6 S 1...

Page 2: ... ELCB or Residual Current Device RCD Otherwise it may cause electrical shock and fire in case of equipment breakdown or insulation breakdown When Transporting Be careful when picking up and moving the indoor and outdoor units Get a partner to help and bend your knees when lifting to reduce strain on your back Sharp edges or thin aluminum fins on the air conditioner can cut your fingers When Instal...

Page 3: ...amaged Check of Density Limit The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out its density will not exceed a set limit The refrigerant R410A which is used in the air conditioner is safe without the toxicity or combustibility of ammonia and is not restricted by laws imposed to protect the ozone layer However since it contain...

Page 4: ...e unit 2 2 Since refrigerant composition changes and performance decreases when gas leaks collect the remaining refrigerant and recharge the required total amount of new refrigerant after fixing the leak 3 Different tools required 3 1 Tool specifications have been changed due to the characteristics of R410A Some tools for R22 and R407C type refrigerant systems cannot be used Item New tools R407C t...

Page 5: ...ts are different 2 Existing tubing cannot be used especially R22 Completely cleaning out residual refrigerating machine oil is impossible even by flushing 3 Refrigerating machine oil differs R22 Since R22 refrigerating machine oil is mineral oil it does not dissolve in R410A Therefore refrigerating machine oil discharged from the compressor can cause compressor damage R22 refrigerating machine oil...

Page 6: ...s 2 2 2 Discharging Compressor Oil 2 4 3 Backup Operation 2 7 4 Recovering Refrigerant 2 9 5 Checking for Leakage After Repair 2 14 6 Evacuating System 2 15 7 Charging Compressor Oil 2 16 8 Pumping Out Refrigerant from Outdoot Unit 2 22 9 Compressor 2 26 10 Replacing Peripheral Parts of Fusible Plug 2 36 11 High and Low Pressure Sensors 2 37 Section 3 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 3 1...

Page 7: ...s 5 31 6 Test Pin 5 35 7 Symptom Thermostat in OFF continues or cycles OFF ON too Frequently 5 36 Section 6 TEST RUN 6 1 1 Preparing for Test Run 6 2 2 Test Run Procedure 6 3 3 Main Outdoor Unit PCB Setting 6 4 4 Function Switches on P C Board 6 7 5 Auto Address Setting 6 9 6 Setting Test Run Remote Controller 6 17 7 Caution for Pump Down 6 18 8 Self Diagnosis Function Table and Contents of Alarm ...

Page 8: ...vii MEMO SM830237 07_北米向け2WAY_VRF indb 8 18 06 19 15 44 15 ...

Page 9: ...Operation Compressor Control Output of PCB Outdoor Unit Fan Control Outdoor Unit CCU command controller unit Control 7 Oil Control 8 9 10 11 12 4 Way Valve Adjustment Control Defrost Control Upper Current Limitation Mode Demand control Backup Operation Other Functions 1 42 13 Detailed Settings in EEPROM of Outdoor Unit 1 44 14 Outdoor Unit Control PCB Contents Contents SM830237 07_北米向け2WAY_VRF ind...

Page 10: ... outdoor unit For the main outdoor unit perform all the settings in the table PCB setting of outdoor unit below The ME2U series outdoor units for USA is a system that allows multiple outdoor units to be connected Main outdoor unit The outdoor unit where the unit No is set to other than 1 is a sub outdoor unit The system will not operate if outdoor units have been set other than unit No 1 This syst...

Page 11: ...This is in order to reduce the load on the power supply equipment 2 Delayed start for each system When systems are linked with one communication cable and multiple systems are required to operate simultaneously by the central control device all main outdoor units will begin operating simultaneously In this situation the load of the power supply equipment increases temporarily To prevent the overlo...

Page 12: ...ompressor is higher than that of other outdoor unit 3 Outdoor Unit Stop Rules 1 Stopping of all outdoor units When all outdoor units must stop all units will stop in order of unit No every one second 2 Stopping of individual outdoor units When it is necessary to reduce the number of operating compressors due to load reduction of indoor units the outdoor units will stop in order of priority for the...

Page 13: ... compressor Compressor trip counter 0 Compressor trip counter 1 Shorter operating time Longer operating time Outdoor unit small address installed in outdoor unit Outdoor unit large address installed in outdoor unit 1 1 Select first priority order of compressor in each outdoor unit by following method The compressor that has no trip counter shorter operating time and smaller number of compressor wi...

Page 14: ...d above is performed when 1st compressor or 2nd compressor is additionally started If necessary capacity is initially higher and two compressors are started simultaneously the operation noted above is not performed and both of them are regarded as the target frequency Type of outdoor unit Minimum frequency Hz Maximum frequency Hz 80 72 96 120 144 100 15 80 15 15 15 80 If the low pressure is over 2...

Page 15: ...nsors E1 or E3 when the indoor unit heat exchanger is functioning as an evaporator Condensation temperature Tc Shows the highest temperature among the high pressure saturated temperature in the system 6 1 Evaporation temperature adjustment by roadmap control The cooling capacity is adjusted with this control It prevents freezing of the indoor unit s heat exchanger and the dew to the outside panel ...

Page 16: ... 51 0 118 2 47 9 Thermostat OFF Area D Area C Area B Area A 124 0 51 1 118 4 48 0 123 8 51 0 15 30 0 118 4 48 0 104 9 40 5 95 0 35 0 91 4 33 0 F C Max required level 109 4 43 0 PX is usually fixed to 136 4 F 58 C If the high pressure goes up rapidly after the compressor starts the system experiences urgent stop The next time the system will start with lower PX In the area B the compressor capacity...

Page 17: ...he highest temperature among all compressors 222 8 106 219 2 104 217 4 103 213 8 101 Capacity goes down 2 0 hp Capacity goes down 1 0 hp Capacity goes down 0 5 hp Compressor capacity increase prohibited Compressor capacity increase possible Compressor capacity decrease 221 0 105 Stop If this temperature is detected at regular intervals alarm appears Low pressure 36 3 0 25 24 7 0 17 Capacity goes u...

Page 18: ...Use the same values of 1st compressor and 2nd compressor B B Current limit 1 Maximum current 1 H Primary Maximum current 1 L 24 30 43 30 30 72 96 120 144 37 22 5 21 5 25 38 22 5 21 5 Current limit 2 Maximum current 2 H Secondary Maximum current 2 L 24 30 44 30 30 39 25 24 25 40 25 24 Type of outdoor unit unit Ampere Current limit 1 Maximum current 1 H Primary Maximum current 1 L 24 30 43 30 30 72 ...

Page 19: ...U 120ME2U94 U 144ME2U94 Use the same values of 1st compressor and 2nd compressor unit Ampere Current limit 1 Maximum current 1 H Primary Maximum current 1 L 15 5 19 5 19 5 19 5 19 5 72 96 120 144 15 5 16 5 15 5 16 5 16 5 16 5 15 5 Current limit 2 Maximum current 2 H Secondary Maximum current 2 L 13 1 16 6 23 0 16 6 16 6 19 5 14 1 13 1 14 1 20 5 14 1 13 1 Type of outdoor unit Noise filter Diode bri...

Page 20: ... right This valve turns OFF when the high pressure goes down below β shown in the table at right This valve turns ON when the high pressure switch is activated This valve stays ON for 10 seconds after the high pressure switch returns in normal After that it turns OFF This valve might turn ON when the system capacity is excessive although the inverter compressor operates at minimum frequency This v...

Page 21: ...xchanger of outdoor unit is the evaporator in heating mode This valve turns OFF when the excessive amount of refrigerant is in the condenser The heat exchanger of indoor unit is the condenser in heating operation The heat exchanger of outdoor unit is the condenser in cooling operation This valve turns OFF when the outdoor unit is stopped This valve might turn ON when a special control is in progre...

Page 22: ... RBV This valve turns ON for 20 seconds after heating operation is stopped and then turns OFF This valve turns OFF when an abnormal drop in compressor discharge gas temperature is detected This valve turns OFF when an abnormal drop in compressor suction gas temperature is detected After the valve turns from ON to OFF it will not turn ON again for 15 minutes This valve turns ON when low pressure se...

Page 23: ...alve ACV The purpose of this valve is to recover oil and refrigerant from the accumulator to the compressor This valve turns OFF when the compressor operation just started This valve turns ON when the compressor is warmed up This valve turns ON while the oil recovery among the systems and defrost control are in progress This valve turns ON while the MOV4 is operating 8 O2 Valve O2 ACV Accumulator ...

Page 24: ...pressor MOV1 pulse MOV2 pulse Stop Stop 0 0 Operation 480 480 Stop 0 0 Operation 0 480 0 480 Stop 0 0 When the indoor unit receives the signal for operation request from the control equipment the pulse turns other than the 480 pulses regardless of the thermostat ON OFF or operating ON OFF It is necessary to switch ON the power supply again if the 480 pulses are required If any one compressor in th...

Page 25: ...stor and low pressure saturated temperature to 5 4deg F 3deg C 10 2 Heating SC Control When the discharge temperature increases to 194 F 90 C or more MOV 4 opens to 100 pulses to cool down the compressor Then the MOV 4 operates according to the state of the discharge temperature between 20 480 pulses This operation takes priority over SC control This operation is continued until discharge temperat...

Page 26: ... temperature 50 F 10 C 13 13 13 13 High static pressure mode setting Condenser 15 15 12 12 Evaporator Ambient temperature 50 F 10 C 15 15 12 12 Ambient temperature 50 F 10 C 15 15 13 13 Minimum value 1 1 1 1 For the sake of protecting temperature of the electrical parts the minimum values of the fan mode may sometimes increase in accordance with the ambient temperature or the amount of secondary c...

Page 27: ... hours when ambient temperature is 41 18 F 5 1 C or more Fan motor operates for 45 seconds and stops for 1 5 hours when ambient temperature is 32 2 41 0 F 0 1 5 0 C Fan motor operates for 45 seconds and stops for 1 hour when ambient temperature is 32 0 F 0 0 C or less EEPROM setting in each main outdoor unit All outdoor units are connected with same communication wiring To activate this function i...

Page 28: ...tory preset mode 1 Silent priority Necessary Silent mode 2 3 Unnecessary Silent mode 4 5 Capacity priority Necessary Silent mode 6 7 Unnecessary Silent mode 8 When the setting is external input to PCB necessary this function works by short circuiting SILENT pins When the setting is external input to PCB unnecessary this function always works When the setting is silent priority max fan mode is deci...

Page 29: ... mode is always increased when the detected high pressure sensor temperature is 114 8 F 46 C or higher Fan mode is increased when the detected high pressure saturated temperature is high and is decreased when the high pressure saturated temperature is low The fan mode may be decreased when the system detects refrigerant shortage at an indoor unit During cooling operation if the fan mode becomes 0 ...

Page 30: ...ntrolled by CCU 1 1 1 Indoor unit without RAP valve kit 1 SH control adjusts the difference between the liquid temperature and gas temperature in indoor unit unit pulse MOV of Indoor Unit SH gas temperature E3 liquid temperature E1 Target SH is 37 4deg F 3deg C when the load level of indoor unit is 30 or 31 test run 3 SC control adjusts the difference in temperature between the liquid temperature ...

Page 31: ...op Stop Stop OFF OFF ON ON Operation 20 20 20 20 20 20 20 20 20 20 20 60 480 SH control 1 65 480 pulses SC control 3 20 Operation Operation Fan only Cooling Heating Heating Cooling Cooling Heating Heating 1 2 Indoor unit with RAP valve kit Go to previous page and see the comments with asterisks 1 and 3 In the case of special controls the MOV performs a special operation For details see 4 Output of...

Page 32: ... CCU intervenes in fan control of the indoor unit according to the status of the operating mode The priority order of fan control by the CCU is higher than that of indoor units Operating mode of outdoor unit Operating mode of Compressor Thermostat ON OFF RAP valve kit ON OFF Stop Cooling Stop Operation Stop Operation Stop Operation Stop Stop Stop OFF OFF ON ON Operation OFF OFF OFF OFF OFF OFF OFF...

Page 33: ... Dry mode Heating mode Cooling mode Dry mode Both Setting No 4 and 5 functions DP operates for XX minutes when indoor unit s operation changes from thermostat ON or thermostat OFF operation stopped In the case of special controls the MOV performs special operation For details see 4 Special Control under this section 4 Drain Pump Control The CCU intervenes in drain pump control of the indoor unit a...

Page 34: ... the signal of indoor PCB not by the CCU Once the drain pump operates it keeps operating for 20 minutes EEPROM setting in main outdoor unit CODE 2B Setting No 20 30 40 60 XX 20 minutes 30 minutes factory preset mode 40 minutes 50 50 minutes 60 minutes Regarding the preset discharge air temperature that is set in the indoor unit is able to change see the section 4 REMOTE CONTROLLER FUNCTIONS for th...

Page 35: ...ems to come short of oil in the system Check valves related to oil recovery operation the refrigerant tubing and for any oil leakage The compressor oil in the crankcase is sent by bypass via a capillary tube to the low pressure circuit The temperature detected by an oil sensor is used to determine whether it is oil warm or refrigerant cold 3 Self separator Oil Recovery Control When a low oil level...

Page 36: ... 1 or lower the system oil recovery control will start This timer will be cleared when the oil level 2 continues for 5 minutes If any compressor oil level 2 remains in the same outdoor unit even though one compressor oil level 0 exists this oil recovery control is not performed When the system oil recovery control is once performed it will not be resumed for 30 minutes System oil recovery control ...

Page 37: ...rol shall be performed as the flow mentioned below Normal operation System oil recovery control Normal operation Simplified flow of system oil recovery control 3WAY SYSTEM Control Functions 8 Oil Control 6 Oil Rotation Control The oil rotation control system regularly exchanges oil among the outdoor units regardless of oil level Oil rotation control is performed every one hour with accumulated ope...

Page 38: ...ntrol time Outdoor units MOV RAP valve kit Fan All outdoor units operate at the maximum capacity MOV at all indoor units operate at a fixed pulse according to the indoor unit capacity All indoor units operate in Cooling mode OFF status Minimum 1 min Maximum 20 min until max pressure sensor temp 95 F 35 C Indoor units Control time Outdoor units MOV RAP valve kit Fan All outdoor units operate at the...

Page 39: ...changer temperature F C 50 10 Ambient temperature F C Frost detection area below the bold lines L1 and L2 L1 L2 59 15 Defrosting operation end temperature unit F C 30 2 1 26 6 3 17 6 8 14 10 13 9 25 5 17 5 27 5 L1 line shown in the figure below is detected for a total of 60 minutes while the compressor is operating Even if all indoor units are stopped while defrosting defrost control continues unt...

Page 40: ...eration Condenser operation E C C E Switching evaporator operation to condenser operation Switching condenser operation to evaporator operation Indoor unit Cooling mode Heating mode Defrost preparation Defrost in progress Defrost end judgment Defrost end Thermostat ON E C E E C Thermostat OFF E C E E C Thermostat ON E C E E C Fan only E C E E C Thermostat OFF E C E E C Compressor Operating Stopped...

Page 41: ...ond operation In the case of 3 outdoor units installed in the refrigerant system Defrost outdoor unit Evaporator outdoor unit Defrost outdoor unit Defrost outdoor unit Defrost outdoor unit Evaporator outdoor unit Evaporator outdoor unit Evaporator outdoor unit Evaporator outdoor unit Defrost outdoor unit Switch to Heating mode indoor units Defrost Preparation Defrost in progress Switch Defrost in ...

Page 42: ...ow input is received by serial parallel I O and demand control is performed The demand values can be set as needed with serial parallel I O The rated current indicates the current value that is listed in the catalog or similar material XX and YY are able to set in EEPROM of main outdoor unit Input present Input not present 1 Demand Control 1 No control 130 130 CODE 1B Setting No YY 0 0 40 40 45 45...

Page 43: ...tional Seri Para I O unit optional CZ CAPDC2 and setup the system The current limitation values can be set by changing either contact The rated current indicates the current value that is listed in the catalog or service manual During setting in DRM1 DRM3 CZ RTC5A demand activated displays on the In respect of connection method for demand terminal block and Seri Para I O unit refer to the installa...

Page 44: ...kup operation does not work When there are multiple outdoor units in the system only the outdoor unit which contains the problem stops but the other outdoor units in the system operate normally 1 Automatic Backup Operation 1 1 Alarms that result in automatic backup operation Alarm list 1 Backup operation continues unless power supply of all outdoor units is turned off Alarm display Overcurrent in ...

Page 45: ... or misplaced DISCH1 OIL1 thermistor for the oil of 1st compressor has failure OIL1 DISCH2 thermistor at the discharge of 2nd compressor is disconnected shorted or misplaced DISCH2 OIL2 thermistor for the oil of 2nd compressor has failure OIL2 B B B B B B B F23 F17 F24 H08 H05 H27 H15 1st compressor discharge temperature too high 2nd compressor discharge temperature too high B B P17 P03 1 2 Start ...

Page 46: ...compressor to disable and turn ON the BACKUP switch SW7 3 Close all service valves at the failed outdoor units 4 Reset the power at outdoor unit No 1 The outdoor unit that backed up all compressors is not controlled by CCU main outdoor unit Even if all compressors of the main outdoor unit are backed up they are not controlled by CCU However the CCU function stays active The manual backup can be us...

Page 47: ...main outdoor PCB is changed to 2 from 3 All compressors of main outdoor unit are backed up All compressors in unit No 1 are backed up Therefore the setting No of outdoor units installed on the main outdoor PCB is changed to 2 from 3 Same setting Examples Combination of 3 outdoor units with 2 compressors Examples Combination of 3 outdoor units with 2 compressors 2 2 Disabling operation of one compr...

Page 48: ...ether to switch the mode in XX minutes intervals Case 1 Number of thermostat ON indoor units in cooling mode Number of thermostat ON indoor units in heating mode system selects cooling mode The heating indoor units will be forced to thermostat OFF Case 2 Number of thermostat ON indoor units in cooling mode Number of thermostat ON indoor units in heating mode system selects heating mode The cooling...

Page 49: ...ly stop excluding stopped indoor units However the upper limit value set by the code 23 must be less than 25 of the total number of indoor units of the system EEPROM setting in main outdoor unit However the upper limit value set by the code 23 must be less than 25 of the total number of indoor units of the system CODE 23 ON ON ON ON ON OFF OFF OFF ON ON ON ON ON OFF OFF OFF ON ON ON ON ON OFF OFF ...

Page 50: ...d 23 E06 ignore function 1 invalid P 0 0 1 1 13 13 14 52 Never use 27 Auto change over function for 2WAY VRF system 0 Invalid P 40 40 minutes 60 60 minutes 120 120 minutes 240 240 minutes 30 30 minutes 50 50 minutes 90 90 minutes 180 180 minutes For details see 12 Other Functions 1 2A Dew condensation prevention control of indoor unit 0 Invalid P 1 30 min 2 40 min 3 50 min 4 60 min 2B DP operation...

Page 51: ...d P 1 Valid C1 O2 output change 0 Continuously set OFF P 1 Refrigerant leak prevention normal OFF 2 Refrigerant leak prevention normal ON E1 Discharge air temperature control with thermostat OFF additional time 20 20 min 19 19 min 0 0 min P 10 10 min Never use the DN code unlisted in the following table P Factory preset mode SM830237 07_北米向け2WAY_VRF indb 43 18 06 19 18 55 36 ...

Page 52: ...sensor LPS CN49 SW1 SW2 High pressure sensor HPS CN46 MODE CN40 pin A ADD CN30 pin STOP CN28 pin SILENT CN33 RUN CN27 pin AP CN24 pin CHK CN23 pin TEST CN22 pin EEPROM memory IC IC14 EEPROM LED LED3 Alarm LED LED2 Alarm LED LED1 SW4 SW7 SW6 SW5 Snow sensor CN34 SW3 Oil detection sensor OIL1 2 CN54 CN67 1 Outdoor Unit Control PCB A747841 U 72ME2U9 U 96ME2U9 OC plug CN76 RC plug CN73 EMG plug CN69 2...

Page 53: ...p TO CN53 Low pressure sensor LPS CN49 High pressure sensor HPS CN46 MODE CN40 pin A ADD CN30 pin AP CN24 pin STOP CN28 pin CHK CN23 pin TEST CN22 pin RUN CN27 pin SILENT CN33 EEPROM memory IC IC14 EEPROM LED LED3 Alarm LED LED2 Alarm LED LED1 SW4 SW3 SW2 SW1 SW6 SW5 SW7 Snow sensor CN34 Oil detection sensor OIL1 2 CN54 CN67 2 Outdoor Unit Control PCB A747593 U 120ME2U9 U 144ME2U9 OC plug CN76 RC ...

Page 54: ...CH1 CN55 SCG CN77 EXG1 2 CN61 EXL1 2 CN60 SCT CN65 TO CN53 LPS CN49 SW1 SW2 HPS CN46 CN40 CN30 CN28 CN33 CN27 CN24 CN23 CN22 LED2 LED1 SW4 SW7 SW6 SW5 CN34 SW3 OIL1 2 CN54 CN67 CN69 CN82 DISCH2 CN56 CN25 2WAY VRF SYSTEM Control Functions 1 46 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 46 18 06 19 18 55 43 ...

Page 55: ...43 U 72ME2U9 U 120ME2U9 U 144ME2U9 V W N P U V W U N P 5 Outdoor Unit HIC PCB A747846 U 96ME2U9 2WAY VRF SYSTEM Control Functions 1 47 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 47 18 06 19 18 55 44 ...

Page 56: ... 2 3 4 5 6 7 8 9 6 Outdoor Unit HIC PCB ACXA73 02090 U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 W NU V U P NV NW 2WAY VRF SYSTEM Control Functions 1 48 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 48 18 06 19 18 55 46 ...

Page 57: ... 02080 A747845 U 72ME2U9 U 120ME2U9 U 144ME2U9 U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 U 96ME2U9 7 Outdoor Unit Filter PCB 2WAY VRF SYSTEM Control Functions 1 49 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 49 18 06 19 18 55 47 ...

Page 58: ...0ME2U94 U 144ME2U94 ACXA73 02100 U 72ME2U9 U 96ME2U9 U 120ME2U9 U 144ME2U9 P W V U N 8 Outdoor Unit FAN PCB A747844 A747844 P U V W NW NV NU 2WAY VRF SYSTEM Control Functions 1 50 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 50 18 06 19 18 55 48 ...

Page 59: ...B and Functions U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 9 Outdoor Unit Relay PCB ACXA73 02110 2WAY VRF SYSTEM Control Functions 1 51 1 2 3 4 5 6 7 8 9 14 Outdoor Unit Control PCB SM830237 07_北米向け2WAY_VRF indb 51 18 06 19 18 55 49 ...

Page 60: ...if system addresses are duplicated For details see Table 1 Switches for setting system address 10s digit and 20s digit SW2 DIP switch 2P Black If 10 systems or more are set the setting is made by a combination of this DIP switch and SW1 If 10 19 systems are set set switch 1 10s digit to ON If 20 29 systems are set set switch 2 20s digit to ON and set switch 1 10s digit to OFF If 30 systems are set...

Page 61: ... season short circuit this pin in the cooling mode Then perform auto address setting When auto address setting is completed release the short circuit to return the unit to normal status When cooling mode is short circuited cooling operation can be used When heating mode is short circuited heating operation can be used TEST pin 2P White CN22 CN23 This pin is used to test the PCB at the factory When...

Page 62: ...OFF ON ON ON ON ON ON ON ON ON ON ON ON 1P 10s digit 2P 20s digit 1 2 3 OFF OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF ON ON ON OFF OFF ON ON ON ON ON OFF OFF OFF OFF OFF OFF ON OFF ON ON OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON 1 2 3 9 0 1 9 0 1 9 0 1 9 0 1 9 0 1 9 0 1 3 4 2 1 2 3 9 10 11 19 20 21 29 30 31 39 40 41 49 50 51 59 60 61 63 64 62 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON...

Page 63: ...emoving Panels Discharging Compressor Oil Backup Operation Recovering Refrigerant Checking for Leakage After Repair Evacuating System Charging Compressor Oil Pumping Out Refrigerant from Outdoor Unit Compressor Replacing Peripheral Parts of Fusible Plug High and Low Pressure Sensors Contents 2WAY VRF SYSTEM Outdoor Unit Repair Procedures SM830237 07_北米向け2WAY_VRF indb 1 18 06 18 18 47 56 ...

Page 64: ...er panels Remove the power outlet panel Remove the tubing cover U 72ME2U9 U 96ME2U9 U 120ME2U9 U 144ME2U9 Be sure to turn off the power before maintenance work Then start working when 5 minutes or longer has passed after turning off the power CAUTION Upper side front panel Lower side front panel Power outlet panel Tubing cover Mounting Plate Power outlet panel Tubing cover Lower side front panel U...

Page 65: ...Removing Panels Fig 1 c Fig 1 d Type 72 96 Type 120 144 Upper side front panel Lower side front panel Power outlet panel Tubing cover Mounting Plate Power outlet panel Tubing cover Lower side front panel Upper side front panel Mounting Plate U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 SM830237 07_北米向け2WAY_VRF indb 3 18 06 18 18 48 07 ...

Page 66: ...s 2 Discharging Compressor Oil High pressure outlet port for ø5 16 ø7 94mm dia connector Low pressure outlet port for ø5 16 ø7 94mm dia connector Liquid tube service port for ø5 16 ø7 94mm dia connector Gas tube service port for ø5 16 ø7 94mm dia connector Nitrogen gas Manifold gauge Lo Hi Oil balance tube service port For ø5 16 ø7 94mm dia connector Packless valve or the like Container Nitrogen g...

Page 67: ...ervice port for ø5 16 ø7 94mm dia connector Nitrogen gas Manifold gauge Lo Hi Oil balance tube service port For ø5 16 ø7 94mm dia connector Packless valve or the like Container Nitrogen gas Manifold gauge Lo Hi Packless valve or the like Container High pressure outlet port for ø5 16 ø7 94mm dia connector Low pressure outlet port for ø5 16 ø7 94mm dia connector Liquid tube service port for ø5 16 ø7...

Page 68: ...e total acid value in the field therefore oil hue and odor are the rule of thumb Checking for carbon deposits and abrasive metal powder can additionally be used to assess the system condition Judgment criteria for changing oil Condition of refrigeration cycle Color Odor Total acid value Hue Normal Yellowish None 0 02 or less 3 5 or less 0 06 or over 4 0 or over Abnormal overheat operation Brownish...

Page 69: ...rating mode blinks on the wired remote controller only to inform the user that operation is in backup mode However this is not displayed on any other control devices Backup operation is intended as emergency operation until repairs are completed Have repairs made as soon as possible 2WAY VRF SYSTEM Outdoor Unit Repair Procedures 3 Backup Operation If the power is not reset on the control PCB of th...

Page 70: ...tube valve at the failed outdoor unit Collecting refrigerant in the failed outdoor unit Short circuit the AP pin CN24 on the control PCB of the failed outdoor unit where the service valves are closed then turn the power ON Also disconnect the wiring between the outdoor units With the normal outdoor units operating monitor the operating condition and open close the liquid tube service valve on the ...

Page 71: ...recovery 2WAY VRF SYSTEM Outdoor Unit Repair Procedures 4 Recovering Refrigerant The remaining refrigerant in the faulty outdoor unit may create internal pressure Before connecting hoses be sure to confirm that each of the manifold gauge valves is tightly closed Note that the connection ports employ Schrader type push to release valves CAUTION For detailed procedures such as connecting the refrige...

Page 72: ...units run excluding indoor unit where refrigerant is recovered Power can independently be turned off for indoor unit where refrigerant is recovered Change controllable number of indoor units including changes in group control and integrated control settings Other indoor units can operate normally Replace or repair faulty unit Check for leakage in repaired unit H Evacuate air from repaired unit H O...

Page 73: ...ntroller to the RC connector 3P BLU CN73 on any one of the outdoor unit control PCBs Then start a test run of all units Press and hold the 1 Determine the outdoor unit where the unit No setting SW5 3P DIP switch Blue on the outdoor unit control PCB is set to No 1 3 Short circuit the CHK pin CHK CN23 on the PCB to start test run operation 2 Short circuit the MODE pin COOL side of CN40 on the main o...

Page 74: ... stop operation at all units Then immediately fully close the gas tube valve on the outdoor unit where pump down is being performed By pulling out the RC1 connector communication between the main and the sub outdoor units will be isolated When not using the outdoor unit maintenance remote controller short circuit the STOP pin CN28 5 Change the setting of controllable outdoor unit numbers reduce by...

Page 75: ...CN24 on the outdoor control PCB of all outdoor units then supply power to the outdoor units By short circuiting the AP pin CN24 and supplying power to the outdoor units the solenoid valve in each unit is forcibly opened and all remaining refrigerant can be recovered Remaining refrigerant may cause internal pressure Check that each valve on the manifold gauge valves is tightly closed The connection...

Page 76: ...e of 484 psi 3 34 MPa Then measure both the outdoor ambient temperature and the pressure in the system Leave the system in this state for 1 full day and night and again measure the outdoor ambient temperature and pressure to determine any reduced values During the inspection it is recommended that an awning or cover be used to shield the unit in case of rain If no problem is found purge all nitrog...

Page 77: ...ng nitrogen gas can be recovered Failure to perform this procedure may result in nitrogen gas remaining in the refrigerant circuit and causing operating problems Therefore never skip this step CAUTION To ensure proper evacuation refer to the operating instructions that came with the vacuum pump CAUTION Fig 7 b Fig 7 a Type 72 96 Type 120 144 6 1 Evacuating Repaired Outdoor Unit Refer to the Instal...

Page 78: ... the gas tube service port carefully to avoid releasing refrigerant into the atmosphere DPR CV623 081 7937 Nipple Packless valve Receiver tank CV638 015 2988 Perform oil charging work carefully so that no liquid refrigerant enters the charging tank CAUTION 1 Evacuation drying in oil charging tank With the lower side valve fully closed open the upper side valve and connect it to the vacuum pump via...

Page 79: ...7 psig 101 kPa 5 Torr Close the upper valve and then stop the vacuum pump Do this operation quickly because compressor oil easily absorbs moisture from the air 3 Charging compressor oil into outdoor unit Connect the lower valve to the low pressure outlet with Schrader type push to release valve in the outdoor unit to be oil charged and then connect the high pressure outlet with push to release val...

Page 80: ... High pressure outlet port for ø5 16 ø7 94mm dia connector Type 120 144 Low pressure outlet port for ø5 16 ø7 94mm dia connector Liquid tube service port for ø5 16 ø7 94mm dia connector Gas tube service port for ø5 16 ø7 94mm dia connector Fig 11 b Close Close Lower side valve Lo Hi Manifold gauge Upper side valve DPR SM830237 07_北米向け2WAY_VRF indb 18 18 06 18 18 48 15 ...

Page 81: ...ge 2 Open the upper valve 3 Open the lower valve manifold gauge upper valve and lower valve in sequence as follows Operating valve Close Open Close Hi side manifold gauge Close No connection Close No connection Open Connect to refrigerant recovery tank Lo side manifold gauge Open Open Open Upper valve Oil charge completed Oil charging Refrigerant recovery oil charging tank inside Process Open Clos...

Page 82: ...th oil Insert the other end of the tube into the oil container 2 Follow the instructions in 6 Evacuating System and apply vacuum to the outdoor unit to be charged with oil When this is done oil is charged into the outdoor unit through the oil outlet port 3 When the unit has been charged with the designated amount of oil stop the vacuum pump The oil absorbs moisture readily This work must be comple...

Page 83: ...above For example Type of replaced compressor C 9RVN393H0M Remaining oil in the removed compressor 0 581 gal 2 2 liter Additional oil to be charged Remaining oil in the removed compressor rated oil amount 0 581 gal 0 502 gal 2 2 liter 1 9 liter 0 079 gal 0 3 liter If the result is a negative amount remaining oil in the removed compressor is less than the rated amount it is not necessary to dischar...

Page 84: ...r 4 seconds or longer The hoses may be subject to internal pressure from the refrigerant inside the outdoor unit Check that the manifold gauge valves are fully closed beforehand A Schrader type push to release valve is provided at each connection port Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup operation by recovering the refrigera...

Page 85: ...me 8 Short circuit the AP pin CN24 on the outdoor unit control PCB of the unit to be repaired Then turn ON the outdoor unit power Open both Hi and Lo side valves on the manifold gauge valves and recover the refrigerant remaining in the outdoor unit After that measure the amount of recovered refrigerant Cooling mode low temperature 68 F 20 C or lower Heating mode high temperature 140 F 60 C or high...

Page 86: ...occurs immediately before operation starts Therefore it does not change at this time Mode change cannot be judged from the sound 4 Short circuit the MODE pin COOL side of CN40 on the outdoor unit control PCB of the No 1 unit The hoses may be subject to internal pressure from the refrigerant inside the outdoor unit Check that the manifold gauge valves are fully closed beforehand A Schrader type pus...

Page 87: ...hat measure the amount of recovered refrigerant When the low pressure at the outdoor unit to be repaired reaches 72 5 psi 0 5MPa or below pull out the SCT connector 2P YEL CN65 from the outdoor unit control PCB of that outdoor unit Then immediately fully close the gas tube valve on that outdoor unit Pulling out the SCT connector immediately stops all of the outdoor units While closing the valves t...

Page 88: ...resistance between the electrified and non electrified parts P16 P29 Compressor 1 INV compressor 1 right side when viewed from front P19 P26 Compressor 2 INV compressor 2 left side when viewed from front A judgment is made based on factors that include the following coil resistance varies depending on the compressor insulation resistance current leakage breaker operation oil and refrigerant foulin...

Page 89: ...engaged follow the instructions in 3 Backup Operation and perform backup operation recovery 8 If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible fully close the high pressure gauge valve on the manifold gauge Then while the unit is operating in 4 2 1 Cooling operation for all units open the low pressure gauge valve on the manifold gauge and ...

Page 90: ...n remove the short circuit at the AP pin CN24 Finally fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 7 If backup operation was engaged follow the instructions in 3 Backup Operation and perform backup operation recovery 8 If charging with an amount of new refrigerant equal to the amount of rec...

Page 91: ...Then fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 8 If backup operation was engaged follow the instructions in 3 Backup Operation and perform backup operation recovery 9 If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible fully close t...

Page 92: ...from the liquid tube service port to all outdoor units where dry cores are attached until the pressure is 14 7 psig 101kPa 5 Torr or less 8 Fully open the liquid tube valve and ball valve on all outdoor units where dry cores are attached 9 10 Follow the above procedure and replace all dry cores with new dry cores Operate all outdoor units for approximately 3 hours in either Heating or Cooling mode...

Page 93: ... unit 17 INSTALLATION Refer to the Installation Instructions for further information Charge with an amount of refrigerant equal to the amount that was recovered Color sample sheet for degree of stain 1 See 4 2 3 Refrigerant recovery procedures 2 Indoor unit with no ball valve equipped Perform pump down of the refrigerant from all indoor units and inter unit tubing to the outdoor unit side 2 Cut th...

Page 94: ...a manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compressor will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement in the outdoor unit tubings 2 3 Remove the caps and insulator surrounding the compressor Fig 17 a 4 Remove the terminal cap on the compressor Then disconnect the power terminal 5 Remove the crankc...

Page 95: ...r the box containing the trans Type 72 96 1 1 1 1 Type 120 144 6 Disconnect the tube with flare nut using two adjustable wrenches At this time cover the tube in place with waste cloth while watching out for oil leaks Then cap the disconnected tube and mount the flare nut on the compressor Tighten the flare nut with a seal bonnet 1 4 in it Attach the cap s to prevent the oil leakage after removing ...

Page 96: ... nut Remove the discharge thermistor High pressure switch Cooling is necessary Crankcase heater Inverter compressor Brazed locations 2 Tube with flare nut Protect the sensors and the surrounding plates rubber lead wires clamps and other items Remove the discharge thermistor shown in Fig 18 CAUTION Cool the high pressure switch and protect it CAUTION 9 Pull the compressor toward you When pulling th...

Page 97: ... and perform nitrogen gas replacement 9 Perform copper brazing at the 2 brazing locations 10 Follow the instructions in 5 Checking for Leakage After Repair and check for leaks at the outdoor unit where the compressor was replaced 11 Attach the insulator surrounding the compressor 12 Follow the instructions in 6 Evacuating System and apply vacuum to the outdoor unit where the compressor was replace...

Page 98: ...ng at the time of replacing the peripheral parts of electronic expansion valve etc and fusible plugs be sure to protect them from the heat affect 10 Replacing Peripheral Parts of Fusible Plug If the fusible plugs are affected by the heat refrigerant leaks may occur CAUTION Fusible Plug Fusible Plug Type 72 96 Type 120 144 SM830237 07_北米向け2WAY_VRF indb 36 18 06 18 18 48 25 ...

Page 99: ...ecovered before removing the sensors the connection port does not employ a Schrader type valve CAUTION 11 1 Removing the High and Low Pressure Sensors 1 Use 2 adjustable wrenches in combination to install the high and low pressure sensors 11 2 Installing the High and Low Pressure Sensors Type 72 96 The connection ports for the high and low pressure sensors do not employ Schrader type push to relea...

Page 100: ...res 2 38 1 2 3 4 5 6 7 8 9 11 High and Low Pressure Sensors 2WAY VRF SYSTEM Outdoor Unit Repair Procedures 11 High and Low Pressure Sensors Type 120 144 Low Pressure Sensor High Pressure Sensor SM830237 07_北米向け2WAY_VRF indb 38 18 06 18 18 48 26 ...

Page 101: ...7 8 9 3 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1 Overview 3 2 2 Functions 3 3 3 Ordinary Display Controls and Functions 3 4 4 Monitoring Operations 3 9 5 Outdoor Unit Alarm History Monitor 3 11 6 Mode Settings 3 12 Contents SM830237 07_北米向け2WAY_VRF indb 1 18 06 18 18 48 59 ...

Page 102: ...on status number of units operating mode etc NOTE Outdoor unit maintenance remote controller does not function as an ordinary remote controller It is therefore only used for test runs and during servicing A l The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller to the outdoor unit PCB l Ordinary remote controllers or other controller are...

Page 103: ... display No of indoor outdoor units Unit Nos of connected indoor outdoor units Indoor outdoor unit operating status blinks when an alarm occurs Indoor unit thermostat ON Display of individual outdoor unit alarms Total operating time of outdoor unit compressors Oil level of the outdoor unit oil sensor Total outdoor unit power ON time Outdoor unit microcomputer version other information n Temperatur...

Page 104: ...B Terminal board l If the communications line in the inter unit control wiring is connected it can be left as is l In case of an independent outdoor unit 1 maintenance remote controller connected to 1 outdoor unit auto address setting for indoor units not completed setting mode 1 can be used l The overall system status for that refrigerant system is displayed l is displayed until auto address sett...

Page 105: ...en heating and cooling operation The display indicates the operating mode of the indoor unit with the lowest unit No l All units test run Operation The Check button can be used to start and stop a test run for all indoor units Press and hold for 4 seconds to turn ON During the test run is displayed The status of test runs performed from the indoor unit remote controller is not displayed on the out...

Page 106: ...ment display 1st compressor operating time 0 99999999 hours 2nd compressor operating time 0 99999999 hours 1st compressor oil level 0 Empty 1 Insufficient 2 Sufficient 2nd compressor oil level 0 Empty 1 Insufficient 2 Sufficient Outdoor unit power ON time 0 99999999 hours 1st compressor operation count 0 65535 times 2nd compressor operation count 0 65535 times Alarm history 1 most recent Display o...

Page 107: ... is currently selected XX Outdoor system address on main bus line 1 30 YY Outdoor unit sub bus address 1 8 1 appears when there is only 1 outdoor unit Locations where À Á and Â are displayed as shown in Fig 1 01 No of connected indoor units 4 units connected Sample displays 02 Unit Nos 1 2 3 and 4 are connected Fig 1 A A LED 1 2 3 A SM830237 07_北米向け2WAY_VRF indb 7 18 06 18 18 49 02 ...

Page 108: ...have passed press the Flap button n The total compressor operating time is displayed in 1 hour units using 8 digits When the first 4 digits are displayed the top dot of the colon is illuminated Figure A When the last 4 digits are displayed the colon dot is OFF Figure B The display of the first 4 digits and last 4 digits changes automatically after 10 seconds The display can also be changed by pres...

Page 109: ...oring is illuminates The display and operations are the same as for monitor mode using the indoor unit remote controller 2 Press the button and select the indoor unit to monitor 3 Press the temperature setting and buttons and select the item code of the temperature to monitor The unit No of the selected indoor unit and the temperature data are displayed 4 To end monitoring press the Check button T...

Page 110: ...econdary current A A 1st compressor primary current L2 A A A A A 2nd compressor primary current L2 Outdoor unit STEP MOV pulse 1 MOV1 STEP MOV pulse 2 MOV2 2nd compressor secondary current 1st compressor actual operating frequency STEP Hz MOV pulse 4 MOV4 1st compressor primary current L1 only 460V 2nd compressor primary current L1 only 460V Low pressure sensor temp Suction temp SCT 1st compressor...

Page 111: ...or unit address 2 Press the button and select the outdoor unit for which to monitor the alarm history 3 Press the temperature setting and buttons and select the item code for the alarm history The select outdoor unit address the item code and the alarm history alarm data are displayed The outdoor unit address is displayed as R C XX YY System XX Outdoor unit system address R C XX Outdoor unit syste...

Page 112: ... change the setting data To confirm the changed setting data press the button At this time display stops blinking and remains lit During this mode is displayed blinking The outdoor unit address display section displays ALL the item code and number DN value in the table and the setting data 6 digits The setting data is displayed in 6 digits The display changes between the first 3 digits Fig A and t...

Page 113: ...Controller CZ RTC5A Timer Remote Controller CZ RTC4 Simplified Remote Controller CZ RE2C2 System Controller CZ 64ESMC2U Schedule Timer CZ ESWC2 Intelligent Controller CZ 256ESMC2U Communication Adapter CZ CFUNC1U Remote Sensor CZ CSRC3 LonWorks Interface CZ CLNC1U Interface Adaptor CZ CAPC2U Refer to the VRF SYSTEMS INDOOR UNIT Technical Data TD831178 High spec Wired Remote Controller CZ RTC3 High...

Page 114: ...no by pressing the or button for changes Maintenance func 1 Outdoor unit error data 2 Service contact 3 RC setting mode 4 Test run Sel Page Confirm 20 30 THU Maintenance func 5 Sensor info 6 Servicing check 8 Detailed settings Sel Page Confirm 20 30 THU Confirm 7 Simple settings Simple settings Unit no Code no Set data 01 3 1 0001 Sel Next 20 30 THU 3 Select the Code no by pressing the or button C...

Page 115: ...rol is in effect press the select the address unit No of the indoor unit to set button and At this time the fan at the indoor unit begins operating If unit No is displayed the same setting will be made for all indoor units 4 Press the temperature setting select the item code to change buttons to 5 Press the timer time buttons to select the desired setting data For item codes and setting data see t...

Page 116: ... 4 F down 0003 Shifts intake temperature 6 F down 0004 Shifts intake temperature 8 F down 0005 Shifts intake temperature 10 F down 0006 Shifts intake temperature 12 F down Electric heater installation 0000 No heater 0001 Heater installed Humidifying when heater thermostat is OFF 0000 No setting at time of shipping 0001 Yes Change to remote controller sensor thermostat differential 0000 Thermostat ...

Page 117: ...mes for each model Model data Model Filter sign ON time Standard Long life Standard High fouling Standard High fouling 0000 1 Way Cassette D1 75 2500 1250 0001 4 Way Cassette 36 36 U2 4 Way Cassette 24 24 Y2 2500 1250 0005 Concealed Duct Medium Static F2 Concealed Duct Low Static M2 0006 Concealed Duct High Static E1 0007 Ceiling T2 1500 750 0008 Wall Mounted K2 150 75 0010 Floor Standing P1 150 7...

Page 118: ...ific remote controller When there are multiple remote controllers in the same refrigerant system it is possible to set one remote controller as the priority remote controller the remote controller which is given priority for selecting the operating mode If 2 or more remote controllers are set as priority remote controllers an alarm will occur at the remote controllers and operation will not be pos...

Page 119: ...mostat is OFF 06 Heating intake temperature shift Shifts the intake temperature during heating Can be set when the body thermostat is used 07 Electric heater installation Set when cost distribution is performed using an AMY central control system or similar system and when an optional electric heater is installed This is unrelated to control of the electric heater 08 Humidifying when heater thermo...

Page 120: ...o by pressing the or button for changes Maintenance func 1 Outdoor unit error data 2 Service contact 3 RC setting mode 4 Test run Sel Page Confirm 20 30 THU Maintenance func 5 Sensor info 6 Servicing check 8 Detailed settings Sel Page Confirm 20 30 THU 7 Simple settings Detailed settings Unit no Code no Set data 10 3 1 0001 Sel Next 20 30 THU 3 Select the Code no by pressing the or button Change t...

Page 121: ...ndoor unit to set button and At this time the fan at the indoor unit begins operating If unit No is displayed the same setting will be made for all indoor units 4 Press the temperature setting select the item code to change buttons to 5 Press the timer time buttons to select the desired setting data For item codes and setting data see the following page 6 Press the button The display stops blinkin...

Page 122: ... 54 Unit No 1 Unit No 2 Unit No 3 Unit No 3 Unit No 2 Unit No 1 Not set Unit No 30 Unit No 64 Not set Individual 1 1 Indoor unit with no group wiring Main unit One of the group control indoor units Sub unit All group control indoor units except for main unit Not set Shifts intake temperature 20 F down Shifts intake temperature 18 F down Shifts intake temperature 2 F down No intake temperature shif...

Page 123: ... 0018 64 F Lower limit at shipment 0019 66 F Lower limit 0029 84 F 0030 86 F Upper limit at shipment Upper limit Heating 0016 60 F Lower limit at shipment 0017 62 F Lower limit 0029 84 F 0030 86 F Upper limit at shipment Upper limit Drying 0018 64 F Lower limit at shipment 0019 66 F Lower limit 0029 84 F 0030 86 F Upper limit at shipment Upper limit Auto heat cool 0017 62 F Lower limit at shipment...

Page 124: ... 0013 Control temperature 55 F 0014 Control temperature 57 F 0025 Control temperature 77 F 0026 Control temperature 78 F Fan output switching 0000 Output linked with fan ON when indoor unit fan is operating 0001 Fan mode operation output Drain pump delayed stop time 0000 No delayed stop 0001 1 sec delayed stop Except Indoor unit Type F2 U2 T2 1 min delayed stop Indoor unit Type F2 U2 T2 0002 2 sec...

Page 125: ... 0001 1 second 0002 2 seconds 0058 58 seconds 0059 59 seconds 0060 Continuously ON Timer function change prohibit 0000 Function disabled 0001 Function enabled Smudging control 0000 No smudging control Setting the Flap Separately Only for 4 Way Cassette type 0000 0001 0002 0003 0004 0005 0006 Setting the Flap Separately Only for 4 Way Cassette type Setting the Flap Separately Only for 4 Way Cassett...

Page 126: ...Increase this value when it is difficult to turn the thermostat ON 18 Automatic stop time after operation start The time at which an indoor unit is automatically stopped after operation starts can be set in increments of 5 minutes 1E Temperature shift for cooling heating change in auto heat cool mode Auto heat cool selects the operating mode automatically based on the difference between the room t...

Page 127: ...l is used for OFF reminder or for fire prevention input 31 Ventilation fan operation from remote controller It is possible to install a total heat exchanger and ventilation fan in the system which can be started and stopped by the wired remote controller The ventilation fan can operate linked with the start and stop of the indoor unit or can be operated even when the indoor unit is stopped Use a v...

Page 128: ... operation to draft reduction mode 46 DC flap swing mode Selects the swing operation mode for the flap 5d DC fan tap setting Sets the DC fan tap according to the purpose of use Change the settings data at the same time 5E Humidifier ON time Sets the humidifier output ON time for when the humidifier is operating ON OFF control is performed during humidifier operation This setting therefore sets the...

Page 129: ...sh the ducting and electrical wiring and prepare it for use Note 1 External static pressure should be set during initial operations after installation before the cooling and heating test run When operating with group control connecting multiple indoor units with one wired remote controller make the concealed duct medium static type to the main unit Start external static pressure setting a No setti...

Page 130: ...een completed for the main unit Decisions on sub unit complete are not possible The test run operation display will disappear after one hour even if the external static pressure setting check or auto airflow volume control operation check have not been completed CAUTION l Make sure the external static pressure is in a range of specifications Then proceed the external static pressure setting Improp...

Page 131: ...r button Select one of the Set data among 0001 0015 according to the desired external static pressure setting by pressing the or button Then press the button See the table below When setting to auto airflow volume control Select the setting data to 002 Then press the button Indoor unit Item code 7 9 12 15 18 24 36 48 54 B0 External static pressure of the rated air flow volume 0 60 in WC 150 Pa 0 6...

Page 132: ...data 2 Service contact 3 RC setting mode 4 Test run Sel Page Confirm 20 30 THU 8 Press the button TEST will be displayed on the LCD display TEST START 20 30 THU 9 Press the button Test run will be started Test run setting mode screen appears on the LCD display TEST FAN SPEED FLAP 20 30 THU COOL MODE 10 Set the operation mode to and fan speed mode to by pressing the or button or or button Then pres...

Page 133: ... the operation mode Fan by pressing the A Mode select button Then select the fan speed by pressing the Fan speed button NOTE Auto airflow volume control operations and external static pressure setting check operations will not be performed unless the above settings are made 4 The fan motor will be activated and auto airflow volume control operations or external static pressure setting check operat...

Page 134: ...tatic pressure Limit line Limit line Limit line Limit line Limit line Type 24 Airflow Volume 0 50 100 150 180 0 0 20 0 40 0 60 0 72 706 1059 1 3 1 2 3 1 6 5 15 14 13 12 11 8 CFM m3 min 20 30 PQ diagram External static pressure L i m i t l i n e Lim it line Lim it line Limit line Limit line Type 36 Airflow Volume 0 50 100 150 180 0 0 20 0 40 0 60 0 72 15 14 13 12 11 8 6 5 3 706 1059 1412 1 3 1 2 1 ...

Page 135: ...h changes etc it is necessary to cancel b Manual setting switching OFF positions When b Manual setting has not been cancelled c Manual setting will be activated if selected but b Manual setting takes precedence when the power is switched back on after power outages etc CAUTION l Make sure the external static pressure is in a range of specifications Then proceed the external static pressure setting...

Page 136: ...own in Fig 3 3 Connect the short circuit connector to the short circuit pin TP3 2P Yellow of the indoor unit control board l In the case of wired remote control setting do not use the short circuit connector TP6 TP3 EMG CN062 CHK CN063 DISP CN064 CN073 JP001 IC010 IC001 TEST EXCT OC RC CN044 CN040 CN041 FAN TAP TP1 T5A L250V TP6 TP3 TP1 Fig 3 White Yellow Red Table 3 External static pressure Type ...

Page 137: ...t data 10 3 1 0006 Sel Next 20 30 THU 3 Select the Code no by pressing the or button Change the Code no to 5D by pressing the or button or keeping it pressed Detailed settings Unit no Code no Set data 0 0 0 0 1 3 Sel Next 20 30 THU 5D 4 Select the Set data by pressing the or button Select one of the Set data among 0003 according to the desired external static pressure setting by pressing the or bu...

Page 138: ... by pressing the buttons for the temperature setting buttons and confirm the values set at shipment 4 Press the buttons for the time to amend the values for the set data See Table 4 and Fig 4 and select a value 5 Press the button The display will stop blinking and remain illuminated 6 Press the button The fan motor will stop operating and the LCD display will return to the normal stop mode Table 4...

Page 139: ...e 12 0 0 0 2 5 0 0 2 5 0 2 5 0 M L L M H H H M L L M H M L H M L H M L L M HT H H L M L M H H External static pressure s upper limit in high static pressure mode Standard external static pressure s upper limit External Static Pressure in WC Pa External Static Pressure Airflow CFM m3 min Airflow CFM m3 min Airflow CFM m3 min Airflow CFM m3 min Airflow CFM m3 min Airflow CFM m3 min External Static P...

Page 140: ...lection Reset operation Unit status Test run Operation with forced thermostat ON 4 Test run Press the button Sensor temperature display Temperature display from each sensor 5 Sensor info Servicing check display Alarm history display 6 Service check Simple settings Filter lifetime operating mode priority central control address and other settings 7 Simple settings Press the button Restart When sett...

Page 141: ... controller is connected stops Detailed settings System address indoor unit address central control address and other settings Auto address Auto address setting based on command from the wired remote controller Automatic reset Entire system stops Address change Change of indoor unit address Press the button CZ RTC4 Press and hold the button for 4 seconds or longer Press and hold the and buttons fo...

Page 142: ...lect 4 Test run on the LCD display and press the button Change the display from OFF to ON by pressing the or button Then press the button Maintenance func 1 Outdoor unit error data 2 Service contact 3 RC setting mode 4 Test run Sel Page Confirm Sel Page Confirm 20 30 THU Maintenance func 1 Outdoor unit error data 2 Service contact 3 RC setting mode 4 Test run 20 30 THU Confirm Test run Change 20 3...

Page 143: ...return to normal remote controller display The temperature cannot be adjusted in Test Run mode This mode places a heavy load on the machines Therefore use it only when performing the test run The test run can be performed using the HEAT COOL or FAN operation modes To prevent continuous test runs this remote controller includes a timer function that cancels the test run after 60 minutes The operati...

Page 144: ...ntly press the or button Select 5 Sensor info on the LCD display and press the button Select the Unit no by pressing the or button for changes Then press the button Display sensor information of the unit See the information by pressing the or button Maintenance func 1 Outdoor unit error data 2 Service contact 3 RC setting mode 4 Test run Sel Page Confirm 20 30 THU Maintenance func 5 Sensor info 6 ...

Page 145: ...ol is in effect press the to select the unit to monitor button Press the temperature setting buttons to select the item code to change Press the button to return to normal remote Display shows a discharge temperature of 00XX at unit No 1 1 controller display A 1 2 3 4 5 3 4 3 4 1 2 5 4 NOTE The temperature display appears as for units that are not connected If monitor mode is engaged while normal ...

Page 146: ...pressor secondary current 19 39 59 1st compressor actual operating frequency 1A 3A 5A MOV pulse 4 MOV4 1B 3B 5B 1st compressor primary current L1 only 460V 1C 3C 5C 2nd compressor primary current L1 only 460V 1D 3D 5D Low pressure sensor temp 1E 3E 5E Suction temp SCT 1F 3F 5F 1st compressor detected oil temp OIL1 20 40 60 2nd compressor detected oil temp OIL2 21 41 61 22 42 62 2nd compressor actu...

Page 147: ...tdoor Unit Control Panel LED Display 5 4 3 2WAY Alarm Codes 5 5 4 Blinking Inspection Display on the Remote Controller 5 30 5 Inspection and Characteristics of Parts 5 31 6 Test Pin 5 35 7 Symptom Thermostat in OFF continues or cycles OFF ON too frequently 5 36 Contents 2WAY SYSTEM Trouble Diagnosis Contents SM830237 07_北米向け2WAY_VRF indb 1 18 06 18 18 50 04 ...

Page 148: ... communication inside outdoor unit control box E31 Improper setting Indoor unit model does not match with the outdoor unit model Multi split mini split L02 Two or more indoor units are set as main in group control L03 Two or more indoor units are set as priority indoor unit L05 Two or more indoor units are set as priority indoor unit L06 Group control wiring is detected for indoor unit set as indi...

Page 149: ...iled to syncronize with rotation P19 Too high load in refrigerant circuit P20 Fan motor or inverter drive of outdoor unit has failure P22 Overcurrent of 2nd compressor on the secondary side of inverter circuit or inverter failed to syncronize with rotation P26 Inverter for 1st compressor failed to start or failed to syncronize with rotation P29 Indoor unit communication error of group control wiri...

Page 150: ... completed successfully After the power is turned ON and auto address setting is not in progress the number of detected indoor units connected to that system matches the number that was set and regular communications are occurring Both OFF Auto address setting is in progress Blinking alternately At time of auto address setting the number of indoor units did not match the number that was set Both b...

Page 151: ...ressure sensor of the outdoor unit has failure HPS 5 14 F17 Low pressure sensor of the outdoor unit has failure LPS 5 15 F23 EXG2 thermistor at the gas side of 2nd heat exchanger of the outdoor unit has failure EXG2 5 12 F24 EXL2 thermistor at the liquid side of 2nd heat exchanger of the outdoor unit has failure EXL2 5 12 F31 EEPROM on outdoor unit PCB has failure 5 15 H01 Overcurrent in 1st compr...

Page 152: ...Overcurrent of 1st compressor on the secondary side of inverter circuit or inverter failed to syncronize with rotation 5 27 P26 Overcurrent of 2nd compressor on the secondary side of inverter circuit or inverter failed to syncronize with rotation 5 27 P17 2nd compressor discharge temperature too high 5 25 P20 Too high load in refrigerant circuit 5 28 P22 Fan motor or inverter drive of outdoor unit...

Page 153: ...utdoor unit in the same link Probable cause Auto address setting is in progress at another outdoor unit Check This alarm is not displayed on the remote controller Therefore check the blinking on the Outdoor Unit Control PCB Correction Wait for auto address setting to be completed at the outdoor unit where it is currently in progress Then start auto address setting again Example Notes E15 Alarm Ala...

Page 154: ...oor unit quantity setting or the inter unit control wiring perform auto address setting again Example Notes E20 Alarm U 72ME2U9 U 96ME2U9 U 120ME2U9 U 144ME2U9 Alarm code E20 Alarm meaning No indoor unit responded in Auto Addressing Alarm conditions When auto address setting was performed no indoor units were recognized Probable cause 1 The inter unit control wiring from the outdoor unit to the in...

Page 155: ...to the indoor units is cut 2 Check whether serial wire is disconnected at the terminal TM1 1 2 3 Check the power at the indoor units Correction 1 Reconnect the inter unit control wire from the outdoor unit to the indoor unit Example Notes Position of serial terminal TM1 1 2 on 2WAY terminal TM1 1 2 E24 Alarm Alarm code E24 Alarm meaning No response from sub outdoor unit Alarm conditions After init...

Page 156: ...e outdoor unit main sub control wiring Example Notes Recovery from this alarm occurs automatically when the set outdoor unit quantity matches the number of outdoor units detected on the outdoor unit main sub control wiring E29 Alarm Alarm code E29 Alarm meaning No response from main outdoor unit Alarm conditions Outdoor unit communications from outdoor unit main were interrupted for 3 minutes or l...

Page 157: ...ldly In some cases the precise temperature may not be known even when monitoring software is used Check Wiggle the sensor and check whether the trouble continues Check whether the connector is partially disconnected from the Outdoor Unit Control PCB An F04 alarm will not result if the connector is completely disconnected circuit is open If the cause is still uncertain check the following to determ...

Page 158: ... no apparent reason The purpose of this alarm is to facilitate identification of the problem in this case F06 F23 Alarm Alarm code F06 F23 Alarm meaning F06 EXG1 thermistor at the gas side of 1st heat exchanger of the outdoor unit has failure EXG1 F23 EXG2 thermistor at the gas side of 2nd heat exchanger of the outdoor unit has failure EXG2 Alarm conditions 1 Short circuit A D step is 10 steps or ...

Page 159: ... less 2 Open circuit A D step is 1014 steps or more Probable cause 1 Sensor malfunction including connector 2 The Outdoor Unit Control PCB malfunction Check 1 Measure the sensor resistance Check that the sensor is operating normally 2 Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer Correction Example Notes F14 Alarm Alarm code F14 Alar...

Page 160: ...rant is likely to accumulate in the outdoor unit cooling and indoor unit heating Sudden rise in pressure at start may sometimes occur 6 Outdoor Unit Control PCB failure The check items are the same as for a high pressure sensor malfunction A normal PCB is needed to determine whether the problem is a PCB failure or a pressure sensor malfunction If an abnormality was found at the check items for a h...

Page 161: ...nd compressor Alarm conditions 1st compressor 2nd compressor primary current detected overcurrent higher than the values overcurrent listed in the table below Model name U 72ME2U9 U 96ME2U9 U 120ME2U9 U 144ME2U9 Current A 30 0 43 0 30 0 30 0 Model name U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 Current A 19 5 19 5 19 5 19 5 Probable cause 1 Wiring failure 2 Operating under extremely high pressu...

Page 162: ...ped the current value at the other compressor is high When this type of condition occurs seizing detection control takes priority 3 If the cause is still unknown after checking the above then it is possible that noise is the cause of the trouble It is necessary to connect a PC or other instrument Correction 1 Replace the CT circuit 2 Replace the Outdoor Unit Control PCB 3 Correct the problem Examp...

Page 163: ...below 14 F 10 C Alarm occurs if the temperature detected by the discharge sensor has changed by less than 3 6 F 2 C when the compressor has operated for 30 minutes immediately after start Probable cause 1 Discharge sensor temperature detector is not inserted into the tube s sensor holder 2 Discharge sensor itself has suffered some kind of malfunction other than a cut wire Check 1 Check that the di...

Page 164: ...en clogging in the refrigerant circuit occurs refrigerant does not return to the compressor As a result low pressure may occasionally decrease abnormally Then check the following points Solenoid valve expansion valve fleezing caused by contaminated water inside the circuit etc 4 Insufficiency of refrigerant gas When insufficiency of refrigerant charge amount or of refrigerant amount in the system ...

Page 165: ...ve ORVR ACV BPV in the oil circuit has malfunctioned or there is clogging of the circuit capillaries which returns oil from the oil separator to the compressor 6 If an excessive amount or liquid returns to the compressor oil foaming may increase oil discharge The same occurs when the refrigerant proportion in the compressor is high at start due to an open circuit in the crank case heater 7 Oil sen...

Page 166: ...nd compressor has failure OIL2 Alarm conditions This alarm occurs when a connector connection pins 1 and 2 for 1st compressor and pins 4 and 5 for 2nd compressor is open Probable cause Disconnected connector Check Check that the connector is securely connected Correction 1 Connect the connector 2 Correct the connection at connector pins 1 and 2 or pins 3 and 4 Example Notes SM830237 07_北米向け2WAY_VR...

Page 167: ... a tester to measure the resistance between the compressor HIC power DC and ground DC If there is a short circuit there is an HIC malfunction Correction Example Notes If an HIC failure is found replace the PCB Turn OFF the power and check the continuity of DC and DC on the HIC PCB L04 Alarm Alarm code Alarm meaning Alarm conditions that unit 5 times or more within 3 minutes Probable cause Check Co...

Page 168: ...ring and connectors are normal use a tester to measure the resistance between the compressor HIC power P and ground NW If there is a short circuit there is an HIC malfunction HIC PCB ACXA73 02090 Correction If an HIC failure is found replace the PCB Example Notes Turn OFF the power and check the continuity of P and NW on the HIC PCB L04 Alarm Alarm code L04 Alarm meaning Duplicate system address s...

Page 169: ... to 0 or to a capacity that is not allowed U 72 96 120 144ME2U9 Number of compressor JP7 in CTL board item code 81 Type of outdoor unit 1 open 210 280 72 96 2 short 355 420 120 144 U 72 96 120 144ME2U94 Number of compressor HIC1 HIC2 item code 81 Type of outdoor unit 1 7 pieces electric wire 210 280 72 96 2 8 pieces electric wire 7 pieces electric wire 355 420 120 140 Correction If item code 81 is...

Page 170: ...ired in order to set the refrigerant type in the outdoor unit EEPROM L18 Alarm Alarm code Alarm meaning Alarm conditions Probable cause 2 The 4 way valve circuit is locked malfunctioning Check 2 If the connector is normal check the 4 way valve wiring and the Outdoor Unit Control PCB circuit Correction Example Notes L18 Reversing valve or solenoid valve failure During heating operation Comp ON the ...

Page 171: ...ed outdoor unit After an outdoor unit stops there is the sound of refrigerant flowing into an outdoor unit that was stopped for a long time When an outdoor unit starts after being stopped for a long time the start is accompanied by much vibration Check Check Check the following points limited to the stopped outdoor units while the other outdoor units are operating Refrigerant leak on the expansion...

Page 172: ...cteristics of high pressure sensor Connect a gauge to the high pressure outlet and check for changes in the value displayed by the monitoring software and for large deviation of the gauge pressure 4 During cooling check whether the outdoor unit heat exchanger is clogged Remove any foreign material that prevents ventilation 5 During cooling check whether an air short blockage has occurred in the ou...

Page 173: ...eset If Yes see 3 3 If No see 3 2 3 2 Since there is no error see what happens 3 3 Indoor Control board defective replace board Example Notes P16 P26 Alarm Alarm code P16 P26 Alarm meaning P16 Overcurrent of 1st compressor on the secondary side of inverter circuit or inverter failed to syncronize with rotation P26 Overcurrent of 2nd compressor on the secondary side of inverter circuit or inverter ...

Page 174: ...ort circuit there is an HIC malfunction Correction 1 If there is a fan HIC failure or circuit failure replace the FAN PCB 2 If the fan motor is locked replace the fan motor Example Notes If the fan does not start the below corrections may be effective Turn OFF the power and check the continuity of P and N on the FAN PCB FAN PCB A747844 P N P20 Alarm Alarm code P20 Alarm meaning Alarm conditions Pr...

Page 175: ...rcuit failure replace the FAN PCB 2 If the fan motor is locked replace the fan motor Example Notes Turn OFF the power and check the continuity of P and NW on the FAN PCB P19 P29 Alarm Alarm code P19 P29 Alarm meaning P19 Inverter for 2nd compressor failed to start or failed to syncronize with rotation P29 Inverter for 1st compressor failed to start or failed to syncronize with rotation Alarm condi...

Page 176: ...F24 has occurred check the alarm history then see the corresponding items Correction Follow the instructions in the corresponding items to correct the trouble Recovery After repairing the malfunctioning locations reset the power for the system all outdoor units Caution Automatic backup mode will not be canceled until the power is reset Notes Automatic backup mode is not engaged in cases of alarms ...

Page 177: ...ure the resistance between each pair of pins on the electronic control valve connector The connector is normal if all results pin 5 pin 1 pin 5 pin 2 pin 5 pin 3 pin 5 pin 4 are approximately 46Ω If the results are 0Ω or replace the coil MOV2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN63 connector 5P red on the Outdoor Unit Control PCB Because of the pulse output a simpli...

Page 178: ...eristics of Thermistor Indoor Unit 40 35 30 25 20 15 10 5 0 4 5 14 23 32 41 50 59 68 8 7 6 5 4 3 2 1 0 68 86 104 122 140 50 131 122 113 104 95 86 77 68 59 10 9 8 7 6 5 4 3 1 2 Resistance Resistance Resistance Temperature F Temperature F Temperature F Intake temperature thermistor TA Indoor unit heat exchanger thermistor E1 E3 SM830237 07_北米向け2WAY_VRF indb 32 18 06 18 18 50 16 ...

Page 179: ... 8 8 6 Coil Resistance of Compressor Motor unit ohm Model name Resistance at 68 F 1st compressor 2nd compressor U V U W V W U V U W V W U 72ME2U9 C 9RVN393HOM 0 246 0 246 0 246 U 96ME2U9 C 9RVN393HON 0 167 0 167 0 167 U 120ME2U9 C 9RVN393HOM 0 246 0 246 0 246 0 246 0 246 0 246 U 144ME2U9 C 9RVN393HOM 0 246 0 246 0 246 0 246 0 246 0 246 U 72ME2U94 C 9RVN393HOK 1 449 1 449 1 449 U 96ME2U94 C 9RVN393...

Page 180: ...or kΩ Resistor kΩ Resistor kΩ Ambient air temperature thermistor TO Suction temperature thermistor SCT Temperature F Temperature F Temperature F Outlet of subcooling heat exchange thermistor SCG Heat exchanger liquid temperature thermistor EXL Heat exchanger gas temperature thermistor EXG Discharge temperature thermistor TD 40 35 30 25 20 15 10 5 0 14 5 4 32 194 176 158 140 122 104 86 68 50 68 68 ...

Page 181: ...in the sequence shown in the table below for 0 5 seconds each Output Operation 1 Relay RY12 4 way valve 20s 2 Relay RY8 Bypass valve BPV 3 Relay RY6 Oil recovery valve ORVR 4 Relay RY11 Refrigerant balance valve RBV 5 Relay RY10 Refrigerant control valve RCV 6 Relay RY4 Save valve SAVE 7 Relay RY2 Crankcase heater 2 CH2 8 Relay RY1 Crankcase heater 1 CH1 9 Relay RY7 PDV OPTION 10 Relay RY9 O2 OPTI...

Page 182: ...unit main control PC board and check alarm messages See operational status 2 2 Yes No 2 2 Discharge temperature is over 176 F 80 C in stop mode and does not decrease Connect outdoor maintenance remote controller to RC socket on outdoor unit main control PC board and check alarm messages Replace discharge temperature sensor 2 3 Yes No 2 3 Demand value always stays low The value is lower than 70 Exc...

Page 183: ...Run Procedure 6 3 3 Main Outdoor Unit PCB Setting 6 4 4 Function Switches on P C Board 6 7 5 Auto Address Setting 6 9 6 Setting Test Run Remote Controller 6 17 7 Caution for Pump Down 6 18 8 Self Diagnosis Function Table and Contents of Alarm Display 6 18 SM830237 07_北米向け2WAY_VRF indb 1 18 06 18 18 50 39 ...

Page 184: ...the compressor should be warm to the touch and the crankcase heater around the feet of the compressor should be hot to the touch ON Power must be turned ON at least 5 hours before attempting test run Power mains switch 6 Both the gas and liquid tube service valves are open If not open them now Gas tube Balance tube Liquid tube 7 Request that the customer be present for the trial run Explain the co...

Page 185: ... Are LEDs 1 and 2 on outdoor unit P C B OFF Are LEDs 1 and 2 on outdoor unit P C B OFF Does system operate If the terminating resistance pin on outdoor main unit P C B is made link wiring more than 2 refrigerant systems set to OPEN side excepting the nearest outdoor unit and the farthest outdoor unit from the central controller Are indoor and outdoor control wires connected to a multiple refrigera...

Page 186: ...3 CN30 CN27 CN73 SW6 SW3 SW1 CN28 CN24 CN40 CN33 CN34 7 3 Main Outdoor Unit PCB Setting U 72ME2U9 U 96ME2U9 SHORT OPEN CN67 CR 72MF2U9 A748186 COOL SW1 SW2 SW3 SW4 SW6 SW5 HEAT A ADD MODE R C ADD NO OF I U ON ON OFF OFF ON OFF ON OFF NO OF O U O U ADD SW5 SW4 CN24 SW6 CN23 CN34 CN27 SW3 CN30 CN28 CN40 SW2 SW1 CN33 CN73 Terminating resistance pin Terminating resistance pin U 120ME2U9 U 144ME2U9 00_...

Page 187: ...Outdoor Unit PCB Setting CN34 CN33 SW5 SW6 SW4 SW3 SW1 SW2 CN24 CN40 CN30 CN28 CN27 CN23 Terminating resistance pin U 72ME2U94 U 96ME2U94 U 120ME2U94 U 144ME2U94 CN73 LED1 JP11 JP12 CN69 CN82 TM1 LED2 CN25 SM830237 07_北米向け2WAY_VRF indb 5 18 06 18 18 50 44 ...

Page 188: ... 1 ON 2 1 3 ON ON OFF 1 Set to 1 21 units 2 ON 1 2 3 ON ON OFF 1 Set to 1 31 units 3 ON 3 2 1 ON ON OFF 1 Set to 1 40 units 1 3 ON 1 2 3 ON ON OFF 0 Set to 0 58 units 2 3 ON 1 2 3 ON ON OFF 8 Set to 8 64 units All ON 1 2 3 ON ON OFF 4 Set to 4 l Sample Setting system address Necessary when link wiring established SW2 SW1 System address number System address SW2 2P Dip switch black System address S...

Page 189: ...ed test run begins If the remote controller is connected in test run mode it is automatically cancelled after 1 hour Also if short circuit is cancelled test run mode is cancelled RC plug 3P BLU CN73 Connects to outdoor unit maintenance remote controller and content of alarm message will be checked RUN pin 2P WHT CN27 When short circuited and pulse signal is given all indoor units operate in the sa...

Page 190: ...e will be checked RUN pin 2P WHT CN27 When short circuited and pulse signal is given all indoor units operate in the same refrigerant system STOP pin 2P WHT CN28 When short circuited and pulse signal is given all indoor units stop in the same refrigerant system When short circuited operation cannot be performed by the indoor unit s remote controller DEF pin 2P WHT CN25 When the pin of the main uni...

Page 191: ...pped Be sure to perform auto address setting again Auto address setting is completed when LEDs 1 and 2 on outdoor main unit control P C board go out 7 Remote control operation is now available When auto address setting is controlled by the remote controller perform auto address setting by the remote controller after step 5 described above See to section Auto Address Setting from Remote Controller ...

Page 192: ... of outdoor units 3 units setting Unit number setting unit 1 Unit number setting unit 2 Set the terminating resistance pin to SHORT side CN67 Unit number setting unit 3 Inter outdoor unit control wiring Inter outdoor unit control wiring Remote control communication wiring Outdoor unit system 1 Inter unit control wiring Inter unit control wiring Remote Controller Indoor unit Inter unit control wiri...

Page 193: ... stopped Be sure to perform auto address setting again Auto address setting is completed when the compressor stops and LEDs 1 and 2 on outdoor main unit control P C board go out 7 Turn ON power to indoor and outdoor units only for another refrigerant system and repeat steps 1 to 5 described above Complete auto address setting for each refrigerant system 8 Remote control operation is now available ...

Page 194: ... in a multiple refrigerant system simultaneously Communication for auto address setting begins and the compressor is started and auto address setting in heating mode begins All indoor units can also be operated To cancel again short circuit the A ADD pin CN30 for over 1 second long and then open circuit LEDs 1 and 2 that indicate auto address setting is in progress go out and that process is stopp...

Page 195: ...ress setting again Auto address setting is completed when the compressor stops and LEDs 1 and 2 on outdoor main unit control P C board go out 7 Short circuit the A ADD pin CN30 on outdoor main unit in another refrigerant system for over 1 second long Then open circuit Repeat the same procedure and complete auto address setting 8 Remote control operation is now available It is impossible to perform...

Page 196: ...e disappears when auto address setting is completed Repeat the same steps to perform auto address setting for each successive system Auto Address Setting from the High spec Wired Remote Controller CZ RTC5A Keep pressing the 1 2 3 and buttons simultaneously for 4 or more seconds The Maintenance func screen appears on the LCD display Press the or button to see each menu If you wish to see the next s...

Page 197: ...re inconsistencies between the number of indoor units and setting number of indoor units Under auto address setting Alternately Auto address setting completed There are inconsistencies between the number of indoor units and setting number of indoor units at the time of auto address setting Simultaneously See the section 8 Self Diagnosis Function Table and Contents of Alarm Display Alternating Disp...

Page 198: ...n and button for 4 seconds or longer simple settings mode 2 The address is displayed for the indoor unit that is connected to the remote controller Only the address of the indoor unit that is connected to the remote controller can be checked 3 Press the button again to return to normal remote controller mode CZ RTC5A High spec wired remote controller Keep pressing the 1 2 and buttons simultaneousl...

Page 199: ...HU COOL MODE START 20 30 THU CZ RTC4 Timer remote controller 1 Press the remote controller button for 4 seconds or longer Then press the button appears on the LCD display while the test run is in progress The temperature cannot be adjusted when in Test Run mode This mode places a heavy load on the machines Therefore use it only when performing the test run 2 The test run can be performed using the...

Page 200: ...remote control wiring and inter unit control wiring connected properly Is indoor unit turned ON power Auto address setting begins but finishes improperly Symptom Cause and countermeasure Soon after a few seconds or after a few minutes the alarm content is displayed on the remote controller See Contents of Alarm Display and make a correction After a few minutes when auto address setting begins the ...

Page 201: ...e remote controller when in the indoor unit group control address setting may not occasionally be made although under setting is displayed 3 Although the alarm E15 and E16 are displayed addresses will be installed in the recognized indoor units The installed addresses can be checked by the remote controller See the section Checking the indoor unit address When operating the remote controller after...

Page 202: ... in outdoor unit has failure SCG F16 High pressure sensor of the outdoor unit has failure HPS F17 Low pressure sensor of the outdoor unit has failure LPS F23 EXG2 thermistor at the gas side of 2nd heat exchanger of the outdoor unit has failure EXG2 F24 EXL2 thermistor at the liquid side of 2nd heat exchanger of the outdoor unit has failure EXL2 F29 EEPROM on indoor unit PCB has failure F31 EEPROM ...

Page 203: ...g Indoor unit model does not match with the outdoor unit model Multi split mini split L03 Two or more indoor units are set as main in group control L05 Two or more indoor units are set as priority indoor unit L06 Two or more indoor units are set as priority indoor unit L07 Group control wiring is detected for indoor unit set as individual control L08 Indoor unit address is not set L09 Capacity set...

Page 204: ...ut detected at EXCT terminal on indoor PCB for refrigerant detector P03 Protective device in outdoor unit is activated 1st compressor discharge temperature too high P04 Protection device activated High pressure switch 63PH 63PH1 or 63PH2 or compressor thermal protector 49C1 49C2 P05 Missing phase in power input is detected at HIC for 1st compressor P15 Missing phase in power input is detected at H...

Page 205: ... C board When connecting central controller interface or peripheral equipment adjustment of terminating resistance pin is necessary Although the connection is not made confirmation is necessary for VRF systems In the case of a refrigerant system the terminating resistance pin for this inter unit control wiring S LINK wiring is one location See the section 5 Auto Address Setting For 2 or more refri...

Page 206: ...201807 SM830237 07_北米向け2WAY_VRF indb 1 18 06 18 18 51 24 ...

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