Technibel Climatisation GRFMI 1158 R7I Service Manual & Test Run Service Manual Download Page 4

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2-WAY MULTISET VRF SYSTEM

Address Settings

1. Address Settings

(Outdoor Units)

1. Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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2. Settings of Indoor Unit Control PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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3. Auto Address Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Summary of Contents for GRFMI 1158 R7I

Page 1: ...2 WAY V R F DC INVERTER A R410A OUTDOOR UNIT TEST RUN SERVICE MANUAL April 2008 ...

Page 2: ...R DSAFM185R DSAFM225R DSAFM255R DSAFM365R DSAFM485R DSAFMHP254R DSAFMHP364R DSAFMHP484R KFM74R KFM94R KFM124R KFM184R KFM254R KFMNC74R KFMNC94R KFMNC124R KFMNC184R KFMNC254R KPAPM75R KPAFM95R KPAPM125R KPAFM165R KPAFM185R KPAFM225R SDAFM76R SDAFM96R SDAFM126R SDAFM166R SDAFM186R SDAFM226R Outdoor Units GRFMI DC Inverter units GRFMI 708 R7I GRFMI 908 R7I GRFMI 1158 R7I GRFMI 1308 R7I GRFMI 1408 R7I...

Page 3: ...ontroller Servicing Functions 2 12 3 Trouble Diagnosis 3 1 1 Contents of Remote Controller Switch Alarm Display 3 2 2 Outdoor Unit Control PCB LED Display 3 4 4 PCB Settings 4 1 1 Outdoor Unit Control PCB 4 2 5 Self Diagnostics Function Table 5 1 1 Self Diagnostics Function Table 5 2 6 Service Checker 6 1 1 Outdoor Unit Maintenance Remote Controller ACC CH80U1 6 2 7 Trouble Diagnosis 7 1 1 2WAY MU...

Page 4: ...1 1 2 WAY MULTISET VRF SYSTEM Address Settings 1 1 Address Settings Outdoor Units 1 Test Run 1 2 2 Settings of Indoor Unit Control PCB 1 3 3 Auto Address Setting 1 4 ...

Page 5: ...he outdoor unit PCB OFF Set the unit address Set the No of outdoor units Set the No of indoor units Set the system address When multiple outdoor main units exist disconnect the terminals extended from the shorted plugs CN003 at all outdoor main unit PCBs except for 1 Alternatively move the sockets to the OPEN side Outdoor unit control PCB O U ADD setting switch S007 Outdoor unit control PCB No of ...

Page 6: ...S002 Rotary switch black R C ADD S003 2P DIP switch blue RC CN006 The number of outdoor units number of indoor units and system address shown below must be set at the No 1 unit main unit These settings are not necessary at all outdoor units other than the No 1 unit At these units set only the unit number General Explanation of the Switches on the Outdoor Unit Control PCB MODE 2P white Changes the ...

Page 7: ...No switch S007 to unit No 2 On the No 3 sub unit control PCB set the unit address No switch S007 to unit No 3 3 On the outdoor main unit control PCB check that the system address rotary switch S002 is set to 1 and that the DIP switch S003 is set to 0 These are the settings at the time of factory shipment 4 To set the number of indoor units that are connected to the outdoor unit to 10 on the outdoo...

Page 8: ...ing pages Move the socket to the OPEN side S006 S007 S005 S004 S003 S002 If link wiring is used No 1 main outdoor unit settings No 2 sub unit settings Unit No 2 Unit No 3 Unit No 1 Main Outdoor unit system 1 Unit No 2 Unit No 1 Main Outdoor unit Indoor unit Remote controller Indoor unit Remote controller Outdoor main sub control wiring Outdoor main sub control wiring Inter unit control wiring Inte...

Page 9: ...and set the rotary switch S004 to 3 5 Turn on power to all indoor and outdoor units in the system 6 Short circuit the automatic address pin at the outdoor main unit CN100 for 1 second or longer then release it Communication for automatic address setting begins Automatic address setting is completed when LEDs 1 and 2 on the outdoor main unit control PCB turn OFF 7 Next turn the power ON only for th...

Page 10: ...mmunication for automatic address setting begins the compressors turn ON and automatic address setting in Heating mode begins All indoor units operate Automatic address setting is completed when the compressors stop and LEDs 1 and 2 on the main unit control PCB turn OFF 7 At the outdoor main unit in the next different system short circuit the automatic address pin CN100 for 1 second or longer then...

Page 11: ...m short circuit the automatic address pin CN100 for 1 second or longer then release it Repeat the same steps to complete automatic address setting for all units 8 Operation from the remote controllers is now possible Automatic address setting in Cooling mode cannot be done from the remote controller Automatic Address Setting from the Wired Remote Controller Selecting each refrigerant system indivi...

Page 12: ...ycle then repeats Alarm is P05 Display during automatic address setting On outdoor main unit PCB LED 1 2 Blink alternately Remote controller display Do not short circuit the automatic address setting pin CN100 again while automatic address set ting is in progress Doing so will cancel the setting operation and will cause LEDs 1 and 2 to turn OFF LED 1 is D72 LED 2 is D75 When automatic address sett...

Page 13: ...ecked 3 Press the button again to return to normal remote controller mode If multiple indoor units are connected to 1 remote controller group control 1 Press and hold the button and button for 4 seconds or longer 2 ALL is displayed on the remote controller 3 Next press the button 4 The address is displayed for 1 of the indoor units which is connected to the remote controller Check that the fan of ...

Page 14: ...VRF SYSTEM Remote Controller Functions 2 2 Remote Controller Functions 1 Remote Controller Test Run Settings 2 2 2 Simple Settings Function 2 3 3 Detailed Settings Function 2 5 4 Remote Controller Servicing Functions 2 12 ...

Page 15: ...es Note The outdoor units will not operate for approximately 3 minutes after the power is turned ON and after operation is stopped If correct operation is not possible a error code is displayed on the remote controller LCD display Refer to Table of Self Diagnostic Functions and correct the problem 4 After the test run is completed press the button again Check that TEST disappears from the LCD disp...

Page 16: ...code and settings data are displayed blinking on the remote controller LCD display Fig 1 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating If unit No is displayed the same setting will b...

Page 17: ...F 0000 MED 1 min LO 3 min LO 0001 MED LO 0002 LO LO 0004 MED 1 min LO 3 min MED 0005 MED MED Fan speed when heating thermostat is OFF 0006 LO MED 0000 No shift 0001 Shifts intake temperature 1 C down 0002 Shifts intake temperature 2 C down 0003 Shifts intake temperature 3 C down 0004 Shifts intake temperature 4 C down 0005 Shifts intake temperature 5 C down Heating intake temperature shift 0006 Sh...

Page 18: ...o or in the case of group control item code and settings data are displayed blinking on the remote controller LCD display Fig 2 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operat ing If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating Press t...

Page 19: ...n unit Group control address 0099 Not set 010 Shifts intake temperature by 10 C 009 Shifts intake temperature by 9 C 001 Shifts intake temperature by 1 C 0000 No intake temperature shift 0001 Shifts intake temperature by 1 C 0009 Shifts intake temperature by 9 C Cooling intake temperature shift 0010 Shifts intake temperature by 10 C 0000 Function disabled 0001 Stops automatically 5 minutes after o...

Page 20: ...19 0027 0026 0017 0018 0001 0000 0000 0001 0000 0002 0002 0000 0001 0002 5 minutes 4 minutes 10 10 10 1 2 3 7 18 19 29 30 16 17 29 30 18 19 29 30 17 18 26 27 9 8 10 9 8 Normal None Used for OFF reminder Ignore heat exchanger temperature conditions Filter input differential pressure switch input Alarm input for trouble input about air cleaner or similar device Humidifier input Operates linked with ...

Page 21: ...e 25 C Heat exchanger temperature for cold air discharge Heat exchanger control point for control to prevent cold air 0026 Control temperature 26 C 0000 Output linked with fan ON when indoor unit fan is operating Fan output switching 0001 Fan mode operation output 0000 No delayed start 0001 1 sec delayed start 0002 2 sec delayed start 0058 58 sec delayed start 0059 59 sec delayed start Drain pump ...

Page 22: ...erial high performance filter 65 Air cleaning unit air cleaning unit optical regenerative deodorizing filter deodorant activated charcoal filter 0003 For air blocking material For 3 way discharge when discharge duct is connected Fan tap setting Fan tap change in order to prevent drop in air discharge caused by filter installation 0006 For air blocking material For 2 way discharge 0000 No humidifie...

Page 23: ...tions High performance filter 90 by JIS colorimetric method High performance filter 65 by JIS colorimetric method Air cleaning unit Optical regeneration deodorant filter for air cleaning unit Deodorant filter Air blocking material for 3 way air discharge Air blocking material when a discharge duct is connected Air blocking material for 2 way air discharge Table 1 Table of DC Fan Motor Tap Settings...

Page 24: ...High ceiling 1 way ceiling cassette type Procedure Be sure to turn OFF the main power source before performing the steps below Open the electrical component box cover then check the indoor unit control PCB Fig 4 Connect the jumper connector 2P yellow which was supplied with the accessory to the correct connector pin on the indoor unit control PCB according to the setting number which was confirmed...

Page 25: ... settings System address indoor unit address central control address and other settings Press and hold the and buttons for 4 seconds or longer Press the button When settings are made from a remote controller the indoor unit where that remote controller is connected stops Automatic address Automatic address setting based on command from the wired remote controller Press and hold th and the e timer ...

Page 26: ... forced ON Procedure Press and hold the button for 4 seconds or longer Test appears on the remote controller LCD display Fig 5 Start operation Press the button to return to normal remote controller display 2 3 1 4 Fig 5 4 Remote Controller Servicing Functions 2 ...

Page 27: ... Press the button to return to normal remote controller display The temperature display appears as for units that are not connected If monitor mode is engaged while normal operation is in progress only the parts of the LCD display shown in the figure will change Other parts continue to display the same information as during normal operation NOTE Fig 6 Display shows a discharge temperature of 85 C ...

Page 28: ...3 1 2 WAY MULTISET VRF SYSTEM Trouble Diagnosis 3 1 3 Trouble Diagnosis 1 Contents of Remote Controller Switch Alarm Display 3 2 2 Outdoor Unit Control PCB LED Display 3 4 3 ...

Page 29: ...s is less than the number set Number of connected indoor units is more than the number set Duplicated outdoor unit address Mismatch in No of outdoor units setting Error of sub outdoor unit in receiving serial communication signal from main outdoor unit Duplication of main indoor unit address setting in group control Group control wiring is connected to individual control indoor unit Indoor unit ad...

Page 30: ... F12 F16 F17 F24 F23 F08 F07 F06 High pressure switch Compressor 1 INV discharge temp sensor Compressor 2 constant speed discharge temp sensor Compressor 3 constant speed discharge temp sensor Outdoor air temp sensor Heat exchanger 1 liquid temp sensor Heat exchanger 1 gas temp sensor Compressor intake temp sensor suction temp High pressure sensor Low pressure sensor Heat exchanger 2 liquid temp s...

Page 31: ...wer is turned ON and auto matic 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 Automatic address setting is in progress At time of automatic address setting the number of indoor units did not match the number that was set Alarm display Blinking alternately LED 1 blinks...

Page 32: ...4 1 2 WAY MULTISET VRF SYSTEM PCB Settings 4 1 4 PCB Settings 1 Outdoor Unit Control PCB 4 2 4 ...

Page 33: ... OC CN001 plug RC CN006 plug RC1 CN106 plug Low pressure sensor Comp discharge 3 temp Comp discharge 1 temp Comp discharge 2 temp Gas temp sensor at heat exchanger 1 2 Liquid temp sensor at heat exchanger 1 2 Outdoor air temp Control circuit fuse F003 High pressure sensor CT2 CT3 Suction temp CTL1 CTL2 Oil detection sensor HIC2 HIC1 HIC3 F04 S002 S003 S004 S005 S006 S010 Power LED D53 S007 EEPROM ...

Page 34: ...is DIP switch and S002 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 set both switch 1 10s digit and switch 2 20s digit to ON For details concerning S002 and S003 refer to Table 1 DIP switch 2P blue Switches for setting system address 10s digit and 20s digit If 10 systems or more a...

Page 35: ...ode is Heating 2P plug white Indoor unit Heating Cooling mode change pin This pin is used to test the PCB at the factory When the power is turned ON after this pin has been short circuited all output signals will be output in sequence Sequential output does not occur if this pin is short circuited when the power is already ON Releasing this pin returns the unit to normal control 2P plug white Indi...

Page 36: ... 2 3 4 5 6 7 8 9 0 OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON ON ON ON S005 Setting 1 2 3 1 2 3 1 2 3 OFF OFF OFF OFF OFF OFF OFF OFF OFF 9 10 11 9 0 1 OFF ON ON OFF OFF OFF OFF OFF OFF 19 20 21 9 0 1 ON ON OFF OFF OFF ON OFF OFF OFF ...

Page 37: ...5 1 2 WAY MULTISET VRF SYSTEM Self Diagnostics Function Table 5 5 Self Diagnostics Function Table 1 Self Diagnostics Function Table 5 2 ...

Page 38: ...nd the inter unit control wiring are connected correctly Check that the indoor unit power is ON An alarm appears on the wired remote controller sometime from several seconds to several minutes after automatic address setting is started LED 1 and 2 on the outdoor unit control PCB indicate that automatic address setting is in progress the LEDs blink alternately for several minutes after automatic ad...

Page 39: ...ng is started from the outdoor unit control PCB or from the remote controller SETTING appears on the remote controller at units where the inter unit control wiring and remote con troller wiring are connected correctly LED 1 and 2 on the outdoor unit control PCB blink alternately In the case of indoor unit group control if there is a mistake in the group control wiring addresses may not be set even...

Page 40: ...t circuit Compressor 3 discharge temperature sensor disconnected H06 Low pressure trouble H08 Compressor 1 oil detection sensor connection trouble H13 Compressor 2 CT sensor disconnected or short circuit H15 Compressor 2 discharge temperature sensor disconnected H22 H21 H23 H25 H27 H28 Compressor 3 lock current alarm H31 HIC trouble alarm Compressor 2 lock current alarm L04 Outdoor unit address du...

Page 41: ...6 1 2 WAY MULTISET VRF SYSTEM Service Checker 6 6 Service Checker 1 Outdoor Unit Maintenance Remote Controller 6 2 ...

Page 42: ...eration manual included in package Outdoor unit Outdoor unit control PCB Inter unit control wiring Indoor unit Indoor unit Remote controller Remote controller The special service checker wiring is required in order to connect the outdoor unit maintenance remote con troller to the outdoor unit PCB Ordinary remote controllers or other controllers are still required for the indoor units even when the...

Page 43: ...gerant system is displayed LED 1 3 Ordinary Display Controls and Functions Functions on the ordinary display Connect the special service checker wiring to the outdoor unit PCB The connection diagram is shown below Fig 7 Fig 8 All units start stop Fig 7 Operation The ON OFF operation button can be used to start and stop all indoor units The LED illuminates if any indoor unit is operating The LED bl...

Page 44: ...Compressor 3 operating time Compressor 3 oil level Compressor 3 operation count Alarm history 1 most recent Alarm history 2 Alarm history 3 Alarm history 4 Alarm history 5 Alarm history 6 Alarm history 7 Alarm history 8 oldest Firmware version Program version Alarm code display Quantity 7 segment display 7 segment display 7 segment display 1 4 7 segment display 7 segment display 0 99999999 hrs 0 9...

Page 45: ...hich is currently selected XX Outdoor unit system address 1 30 YY Outdoor unit address 1 4 The locations where and are displayed as shown on Fig 9 Fig 10 Fig 11 No of connected indoor units 4 units connected Unit Nos 1 2 3 4 connected Sample display Fig 10 Fig 11 1 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER ...

Page 46: ...e are no higher number units connected To change the display to the higher number units before 10 seconds have passed press the FLAP button An 8 digit display is used for display of the compressor total operating time in 1 hour units 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 ...

Page 47: ...he CHECK button The display returns to the normal display The display does not blink NOTE 1 2 3 4 Display of unit No 1 main unit Intake temp E1 E2 E3 Discharge temp Discharge temp setting Indoor unit electronic control valve position Discharge temp 1 at Compressor 1 Discharge temp 2 at Compressor 2 High pressure sensor temp Heat exchanger gas 1 Heat exchanger liquid 1 Heat exchanger gas 2 Heat exc...

Page 48: ...r performed from the indoor unit remote controller However the unit No display shows the outdoor unit address Press the UNIT button and select the outdoor unit for which to monitor the alarm history Press the temperature setting and buttons and select the item code for the alarm history The selected outdoor unit address the item code and the alarm history alarm data are displayed The outdoor unit ...

Page 49: ...orresponding setting data 6 digits are also displayed The 6 digits of the setting data are displayed by changing between the first 3 digits Fig A and the last three digits Fig B When the first 3 digits are displayed the top dot of the colon is illuminated To exit setting mode press the CHECK button Snowfall sensor usage Outdoor unit fan Quiet mode Demand 1 current Demand 2 current 0000 Sensor inpu...

Page 50: ...ress the item code No values from the table below and the corresponding settings data 6 digits are displayed The item code number values shown in the table below and the corresponding setting data 6 digits are also displayed The 6 digits of the setting data are displayed by changing between the first 3 digits Fig C and the last three digits Fig D When the first 3 digits are displayed the top dot o...

Page 51: ...7 1 2 WAY MULTISET VRF SYSTEM Trouble Diagnosis 7 7 Trouble Diagnosis 1 2 WAY VRF DCI Alarm Codes 7 2 2 Blinking Inspection Display on the Remote Controller 7 17 ...

Page 52: ...oor heat exchanger 2 In F24 Liquid temperature sensor trouble at outdoor heat exchanger 2 Out H11 Constant speed compressor 2 overcurrent alarm 7 9 H03 Compressor CT sensor disconnected or short circuit Compressor 3 overcurrent alarm H12 Constant speed compressor 2 lock current alarm Compressor 3 lock current alarm Compressor 3 CT sensor disconnected or short circuit H05 Compressor 1 discharge tem...

Page 53: ...c address setting was performed Probable cause 1 The number of indoor units set at the indoor unit quantity setting SW No of I U S004 S005 on the outdoor unit PCB is too many 2 The inter unit control wiring between indoor units has been cut Check 1 Refer to the test run servicing materials and check the indoor unit quantity setting SW No of I U S004 S005 2 Check the inter unit control wiring at th...

Page 54: ...ddress setting was performed no indoor units were recognized Probable cause 1 The inter unit control wiring from the outdoor unit to the indoor units has been cut 2 Serial connector OC CN001 is disconnected at the outdoor unit 3 The power is OFF at all indoor units in the system Check 1 Check whether the inter unit control wiring from the outdoor unit to the indoor units is cut 2 Check whether ser...

Page 55: ...rol wiring is cut Check 1 Check the outdoor unit quantity setting again 2 Check the outdoor unit main sub control wiring Correction 1 Correct the incorrect outdoor unit quantity setting 2 Repair the 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...

Page 56: ...fluctuates suddenly and wildly 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 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 d...

Page 57: ...m is to facilitate identification of the problem in this case F06 F23 Alarm Alarm code F06 F23 Alarm meaning Gas temperature sensor EXG1 trouble at outdoor heat exchanger 1 Gas temperature sensor EXG2 trouble at outdoor heat exchanger 2 Alarm conditions 1 A D step is 10 steps or less short circuit 2 A D step is 1014 steps or more open circuit Probable cause 1 Sensor malfunction including connector...

Page 58: ...r 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 F16 Alarm Alarm code F16 Alarm meaning High pressure sensor HPS trouble Alarm conditions 1 Sensor short circuit 2 Sensor open circuit Probable cause 1 Sensor malfunction including connector 2 PCB malfuncti...

Page 59: ...ure including cut wiring etc 2 Disconnected CT circuit connector 3 This CT circuit is connected to the connector of the other CT circuit 4 PCB failure 5 Noise Check 1 CT circuit failure PCB failure Trouble Current value during compressor operation is below the threshold value Check Check that the connector is not disconnected Check the continuity of the CT circuit Install a normal CT in place of t...

Page 60: ...lower high pressure level results in a smaller difference between low pressure and high pressure that may be insufficient to cause refrigerant flow 3 The refrigerant circuit has become closed and refrigerant has not returned to the compressor In some cases when moisture enters the refrigerant circuit it can freeze at the low pressure locations and the resulting ice can block the circuit If the ala...

Page 61: ...k current alarm H22 Compressor 3 constant speed lock current alarm H21 Compressor 3 constant speed overcurrent alarm H11 H12 H21 H22 Trouble Check Current value during operation greatly exceeds the value shown above When the current for each phase is measured with a clamp meter or similar instrument check that the current value for all phases is not high If MG was forced ON use caution check that ...

Page 62: ...mpressor 1 discharge temperature sensor DISCH1 disconnected Compressor 2 discharge temperature sensor DISCH2 disconnected Compressor 3 discharge temperature sensor DISCH3 disconnected Alarm conditions This alarm occurs when the discharge sensor temperature detector is not inserted into the tubeʼs sensor holder or when the sensor itself has suffered some kind of malfunction other than a cut wire Wh...

Page 63: ...r more within 3 minutes Probable cause Incorrect outdoor system address settings Check Check the system address settings again Correction Correct the system address settings Example Notes Recovery from this alarm occurs automatically when communication that contains the same address as that unit is not received for 3 minutes after detection The HIC judges the current and temperature and outputs th...

Page 64: ...he item code 80 refrigerant type If the setting is incorrect change it to R410A Correction Example Notes The outdoor unit maintenance remote controller is required in order to set the refrigerant type in the outdoor unit EEPROM L06 Alarm Alarm code L06 Alarm meaning Duplicated indoor unit priority alarm at non priority indoor units and outdoor unit Alarm conditions Multiple indoor units set as the...

Page 65: ...cal valve is opened to 300 pulses or more after checking for foreign object intrusion 4 Foreign object intrusion Trouble Liquid valve effectiveness is poor Check Check that there is no difference in the condensation or frost conditions between the strainer primary side and secondary side tubing 5 Crossed thermistor Trouble The discharge temperature of the other compressor is high although only thi...

Page 66: ...t the outdoor heat exchanger has not become clogged or blocked Remove any objects that impede the flow of air 4 If the operation is cooling operation check that an air short circuit has not occurred at the outdoor unit The status is OK as long as the temperature in the area around the outdoor unit does not become abnormally high during operation 5 If the operation is cooling operation check that t...

Page 67: ...ng Compressor 1 INV overcurrent alarm Alarm conditions This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of less than 80 Hz after start when trouble judgment current is detected 13 5 A or higher in the primary or secondary current Probable cause There is a strong possibility of a compressor failure An alarm occurs for current detection trouble when...

Page 68: ...e primary or secondary current Probable cause The detection methods are the same as for P16 However the fact that operation up to high frequencies is possible does not necessarily mean that a compressor failure is the cause of the trouble Start the compressor several times If alarm P26 occurs every time and alarm P16 does not occur at all then the possibility of a compressor failure is low It is a...

Page 69: ...H31 has occurred check the alarm history then refer to 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 al...

Page 70: ...ower is turned OFF the primary side and secondary side contacts remain together The conditions of magnet SW operation are poor difficult to open When a magnet SW is used in a DC circuit it may be difficult for the SW to open at times In an AC circuit the magnet SW should open instantaneously as long as the current is within the allowable range However this kind of trouble can occur if excessive cu...

Page 71: ...R D 28 Reyrieux BP 131 01601 Tré voux CEDEX France Té l 04 74 00 92 92 Fax 04 74 00 42 00 R C S Bourg en Bresse B 759 200 728 ...

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