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40MBAB: Service Manual

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

28

DIAGNOSIS AND SOLUTION (CONT.)

PC 03 - Low Pressure Protection Diagnosis and Solution

Description: If the sampling voltage is not 5V, the LED displays a failure code.
Recommended parts to prepare:

• Connection wires
• Low pressure protector
• Indoor fan assembly
• Outdoor PCB

Troubleshooting and Repair:

Low pressure protection 

?

Are the low pressure protector 

and main control board wired 

properly?

Yes

Reconnect the low pressure protector 

and main control board.

Replace outdoor main board.

No

Replace the low pressure protector.

Is the outdoor ambient 

temperature too low ?

No

Stop the unit.

Yes

Open the valve core of the high

pressure valve.

No

Is the valve core of the high 

pressure valve fully opened?

Is the indoor fan running

properly in cooling mode? 

.

Refer to the solution to the malfunction 

of fan speed being out of control. Find
the cause and resolve the problem.

No

Yes

Yes

.

Check whether the refrigerant 
system is functioning properly .

No

?

 Is it in working order?

No

No

Yes

When the refrigerant level is not

sufficient, does the system function 

properly after more refrigerant

is added?

Is the low pressure protector broken?

Method: Disconnect the plug.

Measure the resistance of the low pressure 

protector. If the protector is normal, 

the value is 0.

Summary of Contents for 40MBAB

Page 1: ...fies the most serious of hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation INTRODUCTION This...

Page 2: ...OR UNIT MB MODEL VOLTAGE 3 208 230 1 60 INDOOR FAN COIL UNIT TYPE A AIR HANDLER UNIT TYPE Q Heat Pump MAXIMUM NUMBER OF FAN COIL UNITS CONNECTED TO THE OUTDOOR UNIT A 1 1 NOMINAL CAPACITY 18 1 1 2 TON 24 2 TONS 30 2 1 2 TONS 36 3 TONS 48 4 TONS 60 5 TONS A Light Commercial B Non Light Commercial B MAJOR SERIES 21 22 10001 Week of Manufacture Sequential Serial Number V V ALL MODELS Year of Manufact...

Page 3: ...3 power is provided from the external control system and not from the unit The contacts are rated at 250VAC and 10 AMP maximum If an active 24V signal output is required G and C ports thermostat connections may be used instead Fig 1 Auxiliary Contacts ALARM Terminal Port CN33 Normally Open DRY CONTACT OUTPUT Allows the terminal port to connect to an external ALARM interface or annunciator There is...

Page 4: ...LOSED contacts normal OPEN contacts overflow When an overflow condition occurs a signal is sent to the system to turn it off Alarm EE appears Fig 3 Auxiliary Contacts UV LED terminal port CN43 OUTPUT 24VAC The UV LED port is linked to the unit s fan When the fan is running the relay is closed and there is an output of 24VAC through the contacts that can be used to power a compatible UV LED LIGHT M...

Page 5: ...OFF function When the remote switch is off OPEN the unit is OFF When remote switch is on CLOSE the unit is ON When the remote switch is close open the unit responds to the demand within 2 seconds When the remote switch is on you can use the included remote controller or wired controller to operate the unit as normal When the remote switch off the unit will not respond to the command from the remot...

Page 6: ...oller Range 00 63 Fig 7 Unit Configuration Fig 8 Unit Configuration Factory Settings 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON 0 8 4 1 2 3 5 6 7 C 9 A B D E F 1 2 ON S1 S2 0 F 0 F 0 F 0 F NETADDRESS CODE 0 15 16 31 32 47 48 63 FACTORY S ETTING FOR SETTING NETADDRESS 0 8 4 1 2 3 5 6 7 C 9 A B D E F 0 F ON OFF CODE FACTORY 1 ...

Page 7: ...to turn on the temperature difference 1 8 F 1 C 3 6 F 2 C SW2 2 Whether the electric heating is delayed YES NO SW2 3 Electric auxiliary heating delay start time 30 minutes 15 minutes SW2 4 Electric heating compressor allow opening limit Compressor allowed to operate to low limit set by S3 Electric heating allowed to operate to high limit set by S3 SW3 1 Continuous running time when the 1 8 F 1 C s...

Page 8: ...cable with the cable clamp The cable must not be loose or put strain on the fork terminals 7 Reattach the electric box cover Fig 10 Ferrite Core Magnetic Ring The main power is supplied to the outdoor unit When disconnecting the power of the outdoor unit the indoor unit would lose power A disconnect switch is not required on the indoor unit side on the wiring between the outdoor and indoor unit A ...

Page 9: ...r this scenario to be enabled SW1 1 must be set to the OFF positions Default SCENARIO 1 Wireless controller Included Hand held wireless remote provides the same functionality as the wired controller and can be used in conjunction with the wired controller Refer to the owner s manual for the remote s operational instructions For this scenario to be enabled SW1 1 must be set to the OFF position Defa...

Page 10: ...d N 230VAC SWITCH Output 5VDC Output 24VAC Output 5VDC Output 5VDC Output 220VAC Output 12VDC Output 24VAC Output 15VDC Output 220VAC Output 24VAC JR1 CN5 CN4 Cn 1 CN2 ON OF F Remot e Contro l CN6 CN9 CN1 0 CN1 1 CN7 2 WIR E WIR E CONTROLLE R CN1 4 4 48 5 POR T CN3 E Y X To CCM Comm Bu s Output 24VAC Output 24VAC Output 15VDC Output 12VDC Output 15VDC Output 12VDC Output 5VDC Output 24VAC Output 2...

Page 11: ...N 5 WATER LEVEL CN4 6 T1 ECM Cn15 M 4 3 3 Cn34 CN4 3 UVLE D Output BLU E RED RED TRAN S CN2 2 RED CN9 J1 CN2 9 T2 Cn1 2 3 HEATER 2 CN1 1 N L L and N 230VAC SWITCH Output 5VDC Output 24VAC Output 5VDC Output 5VDC Output 220VAC Output 12VDC Output 24VAC Output 15VDC Output 220VAC Output 24VAC JR1 CN5 CN4 Cn 1 CN2 ON OFF Remote Control CN6 CN9 W1 CN1 0 DH CN1 1 CN7 2 WIR E WIRE CONTROLLER CN1 4 4 48 ...

Page 12: ...e the tubing so that vibration or noise is not transmitted into the structure 6 For piping runs greater than 25 ft 7 6 m add refrigerant up to the allowable length as specified in the product data Refrigerant Coil Specifications Table 5 Refrigerant Coil Specifications UNIT SIZE 18 24 30 36 48 60 DUCTED INDOOR COIL Number of rows 3 4 5 Tube pitch a x row pitch b in 0 83x0 53 mm 21x13 37 Fin Spacing...

Page 13: ...circuited Page 22 ELOC Refrigerant Leakage Detection for some models Page 23 EH06 Communication error between indoor two chips EH0E Water level alarm malfunction Page 24 EC07 The outdoor fan speed is operating outside of the normal range for some models Page 20 EC51 Outdoor unit EEPROM parameter error EC52 Condenser coil temperature sensor T3 is in open circuit or has short circuited Page 22 EC53 ...

Page 14: ...x x x x T2 Sensor x x x x x x x x x T2B Sensor x x x x x x x x x T2A Sensor x x x x x x x x x T3 Sensor x x x x x x x x x x T4 Sensor x x x x x x x x x Reactor x x x x x x x x x Compressor x x x x x x x x x x Additional refrigerant x x x x x x x x x Water level switch x x x x x x x x x Water pump x x x x x x x x x PART REQUIRING REPLACEMENT EC 54 EC 51 EC 5C EC 52 EC07 71 72 73 PC 00 PC 01 PC 02 P...

Page 15: ... x x TP Sensor x x x x x Pressure sensor x x x x x x Reactor x x x x Compressor x x x x x x IPM module board x x x x x Data adapter board x x x x High pressure valve assembly x x x x x High pressure protector x x x x x x Low pressure protector x x x x x x Additional refrigerant x x x x PART REQUIRING REPLACEMENT PC 41 PC 43 PC 10 11 12 PC 30 PC 31 PC 40 Indoor PCB x x x x x x Outdoor PCB Outdoor f...

Page 16: ... and Solution Description Indoor or outdoor PCB main chip does not receive feedback from the EEPROM chip Recommended parts to prepare Indoor PCB Outdoor PCB Troubleshooting and Repair NOTE The priority is EH00 followed by EC51 Shut oī the power and turn it on 2 minutes later Is it sƟůů displaying the error code The unit is operaƟng normally No Replace the indoor main PCB EH 00 outdoor main PCB EC ...

Page 17: ... minutes later Use a shield cable grounding No Yes Correct the connection No Yes Yes Replace the signal wire Yes Pull out and re insert No Replace the outdoor main PCB Check whether the signal wire is shield cable or whether the shield cable is ground Check whether the wire has the correct polarity P to P Q to Q or E to E Check whether the signal wire is broken Check whether the signal wires are i...

Page 18: ...ndoor PCB are they good Check if the power LE D is on Yes Yes Unplug all the high voltage components connected to main PCB such as 4 way valve heater AC fan one by one to check their resistance Is there any component short circuit Unplug electronic expansion valve Check if power LED ison No No Check the AC voltage of L N output to IP M board is it same as power input Check the DC 5V 12V from IPM b...

Page 19: ...pin is for the 3 port or N or S Terminal When the unit is normal running the voltage is moving alternately as positive values and negative values If the outdoor unit malfunctions the voltage remains a positive value If the indoor unit malfunctions the voltage does not change Use a multimeter to test the reactor resistance which does not connect with the capacitor The normal value should be around ...

Page 20: ...ays the failure Recommended parts to prepare Connection wires Fan assembly Fan motor PCB Troubleshooting and Repair NOTE For certain models the outdoor PCB cannot be removed separately In this case the outdoor electric control box should be replaced as a whole YES Power off Restart the unit after 2 minutes Is it within normal parameters Replace the fan motor Does a problem remain The unit is opera...

Page 21: ...t in the range shown in Table 12 the PCB has an issue and needs to be replaced Table 12 CN34 Table 13 CN15 2 Outdoor DC Fan Motor control chip is in outdoor PCB Release the UVW connector Measure the resistance of U V U W V W If the resistance is not equal to each other the fan motor has an issue and needs to be replaced Otherwise the PCB has an issue and needs to be replaced Fig 17 Outdoor DC Fan ...

Page 22: ...ensors PCB Troubleshooting and Repair NOTE The priority is EC 52 EC 53 EC54 EC55 EC 56 EH 60 EH61 EH62 EH 65 Fig 18 Test NOTE For certain models the outdoor PCB could not be removed separately In this case the outdoor electric control box should be replaced as a whole Figure 18 and the value within are for reference only The actual appearance and value may vary Check the connection between the tem...

Page 23: ...Recommended parts to prepare Indoor PCB Additional Refrigerant Troubleshooting and Repair Power off then restart the unit 15 minutes later Are there any leaks Place your hands in front of theindoor air outlet Is cool or hotair blowing from the indoor air outlet Ensure proper connections Check system for leaks NO NO Repair the leak and recharge the refrigerant YES NO Is T2 loose YES YES Is T1 too c...

Page 24: ... voltage is not 5V the LED displays the failure code Recommended parts to prepare Connection wires Water level switch Water pump Indoor PCB Troubleshooting and Repair Power off then restart the unit 2 minutes later Isthe water level switch inserted properly Insert the water level switch properly NO YES Replace the water level switch NO YES Replace the indoor main PCB Doesa problem remain YES The u...

Page 25: ...or Outdoor PCB Troubleshooting and Repair NOTE For certain models the outdoor PCB cannot be removed separately In this case the outdoor electric control box should be replaced as a whole Check the wiring between PCB and compressor Does an error exist Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it in working order Replace the IPM board or replace the outdoo...

Page 26: ...on circuit Recommended parts to prepare Power supply wires IPM module board PCB Reactor Troubleshooting and Repair NOTE For certain models the outdoor PCB could not be removed separately In this case the outdoor electric control box should be replaced as a whole Check the power supply Is it in working order Turn off the unit NO Check the connections and wires YES Are they in working order NO Power...

Page 27: ...ting and Repair Check if the air flow system of the indoor and outdoor units is obstructed Clear the air inlet and outlet or the indoor and outdoor unit s heat exchanger Yes No Yes Yes Turn off the power supply Wait 10 minutes and turn back on Check if the compressor top temperature is higher than 194 F 90 C No Check if the refrigerant system is normal Repair the refrigerant system Replace the out...

Page 28: ...board Replace outdoor main board No Replace the low pressure protector Is the outdoor ambient temperature too low No Stop the unit Yes Open the valve core of the high pressure valve No Is the valve core of the high pressure valve fully opened Is the indoor fan running properly in cooling mode Refer to the solution to the malfunction of fan speed being out of control Find the cause and resolve the ...

Page 29: ...fan assembly Compressor Outdoor PCB Troubleshooting and Repair NOTE For certain models the outdoor PCB could not be removed separately In this case the outdoor electric control box should be replaced as a whole Check the wiring between the PCB and compressor Is it improperly wired Ensure proper connections or replace the wires and connectors YES Check the IPM NO Is it functioning properly Replace ...

Page 30: ... Description It is a protection function When the compressor is off the outdoor ambient temperature T4 is lower than 31 F 35 C for 10 second the unit stops and displays the failure code When the compressor is on and the outdoor ambient temperature T4 is lower than 40 F for 10 seconds the unit stops and displays the failure code When the outdoor ambient temperature T4 is no lower than 25 F for 10 s...

Page 31: ...ive feedback from another chip Recommended parts to prepare Indoor main board Adapter board adapter Troubleshooting and Repair Yes No No No Trouble is resolved Yes Shut off the power supply and turn it on 2 minutes later Is it still displaying the error code Yes Yes Check the connection wires between the adaptor board and the main board Is it connected properly Reconnect and retry Does the error s...

Page 32: ...ard Outdoor main PCB Troubleshooting and Repair DIAGNOSIS AND SOLUTION CONT FL 09 Indoor and outdoor mismatch malfunction Diagnosis and Solution Description Indoor and outdoor units are mismatched the LED displays this code Replace the matching indoor or outdoor unit YES Power off then restart the unit after 3 minutes Does the error still exist Replace the outdoor main control board Does a problem...

Page 33: ... the indoor unit A is working in the COOLING mode or the FAN mode and the indoor unit B is set to the HEATING mode The indoor unit A turns off and indoor unit B keeps running in the HEATING mode Suppose the indoor unit A is working in the HEATING mode and indoor unit B is set to COOLING mode or the FAN mode then indoor unit B changes to STANDBY and indoor unit A remains in the current mode Table 1...

Page 34: ...e PCB 2 Measure the sensor s resistance value using a multi meter 3 Check the corresponding temperature sensor resistance value Fig 19 Temperature Sensor Check NOTE Figure 19 is for reference only The actual condition and specific value may vary according to temperature Turn off all power supplies or disconnect all wires to avoid electric shock Operate after compressor and coil have returned to no...

Page 35: ...s and designs without notice and without obligations 35 Compressor Check 1 Disconnect the compressor power cord from the outdoor PCB 2 Measure the resistance value of each winding using a multi meter 3 Check the resistance value of each winding using Figure 20 Fig 20 Input Terminal typical ...

Page 36: ...4 36 97 6 13059 76 169 1 34105 116 241 0 4006 3 27 41 5878 37 99 5 87359 77 171 1 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 3...

Page 37: ...3 37 3 74 165 8 358 114 237 2 489 5 23 234 9 35 95 35 78 75 167 8 084 115 239 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 10...

Page 38: ...ns without notice and without obligations 38 DISASSEMBLY INSTRUCTIONS Electrical Parts Anti static gloves must be worn PROCEDURES ILLUSTRATION 1 Remove the 2 screws of the upper cover plate assembly then remove it 2 Remove 2 screws then unplug the plugs 3 Pull out the electric control box subassembly ...

Page 39: ...9 DISASSEMBLY INSTRUCTIONS CONT Electrical Parts Anti static gloves must be worn CONT PROCEDURES ILLUSTRATION 4 Remove the 2 screws and 1 ground screw 5 Unplug the plugs then remove the main control board subassembly 6 Release the data transfer module control board screw 1 and remove the board 7 Release the 2 screws then remove the transformer ...

Page 40: ...erves the right to change at any time specifications and designs without notice and without obligations 40 DISASSEMBLY INSTRUCTIONS CONT Fan Motor and Fan PROCEDURES ILLUSTRATION 1 Remove the 2 fan assembly screws 2 Remove the fan assembly ...

Page 41: ... specifications and designs without notice and without obligations 41 DISASSEMBLY INSTRUCTIONS CONT Fan Motor and Fan Cont PROCEDURES ILLUSTRATION 3 Release the 3 nuts securing the fan motor then remove the fan motor 4 Release the 1 nut securing the fan and then remove the fan ...

Page 42: ...erves the right to change at any time specifications and designs without notice and without obligations 42 DISASSEMBLY INSTRUCTIONS CONT Evaporator PROCEDURES ILLUSTRATION 1 Remove the cover plate 2 Remove the cover plate assembly screws 3 ...

Page 43: ...tions and designs without notice and without obligations 43 DISASSEMBLY INSTRUCTIONS CONT Evaporator Cont PROCEDURES ILLUSTRATION 3 Remove the evaporator with a water collector assembly 4 Remove the water collector assembly screws 2 5 Release the evaporator and water collector assembly ...

Page 44: ...l rights reserved Edition Date 09 22 Catalog No SG 40MBAB 01 Replaces NEW 40MBAB Service Manual Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 44 ...

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