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OUTDOOR TECHNICAL OVERVIEW

B-7

ENGLISH

Components

Outdoor Coil Cooling

Outdoor Coil Cooling
Temperature Sensor

Temperature Sensor

Outdoor Coil

Outdoor Coil

Entering Gas

Entering Gas

Temperature

Temperature

Sensor

Sensor

Outdoor coil

Outdoor coil

Heat Mode

Heat Mode

Temperature

Temperature

Sensor

Sensor

(Defrost)

(Defrost)

Module

Module

Heat Sink

Heat Sink

Temperature

Temperature

Sensor

Sensor

Compressor

Compressor

Discharge Line

Discharge Line

Temperature

Temperature

Sensor

Sensor

Compressor

Compressor

Suction Line

Suction Line

Temperature

Temperature

Sensor

Sensor

T

emperature Sensors

The outdoor unit has two groups of temperature sensors. The first group of sensors are Liquid and Gas Sensors that are

associated with each indoor unit EEV. These sensors monitor the leaving liquid temperature from the EEV and the returning

Suction Vapor temperature from the indoor units. The difference between the two temperatures is used to calculate the

operational suction vapor superheat level of each calling indoor unit. These sensors are labeled Tc1 and Tc2 on the schematic
drawing. They plug into the ECU unit on a series of plugs located near the center of the circuit board.
The second group of sensors monitor key temperatures in the refrigeration circuit and outdoor unit. The sensors associated
with the refrigeration circuit include compressor discharge line temperature, compressor suction line temperature, outdoor
coil entering gas temperature, outdoor coil temperature cooling mode and outdoor coil heat mode temperature (Defrost).
The ambient outdoor air temperature is monitored by sensor Ta. The temperature of the heat sink attached to the Module
Board is monitored by Sensor Tm. These sensors connect to the ECU via plugs CN-7 and CN-14.

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Summary of Contents for AW07EH2VHA

Page 1: ... 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB Indoor Wall Mount Highwall AW07EH2VHA AW09EH2VHA AW12EH2VHA AW18EH2VHA AW07LC2VHB AW09LC2VHB AW12LC2VHB AW18LC2VHB AW24LP2VHA 2 x2 Compact Cassette AB09SC2VHA AB12SC2VHA AB18SC2VHA 3 x3 Large Cassette AL24LP2VHA Slim Duct AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB Mid Static Ducted USYM09UCDSA USYM12UCDSA USYM18UCDSA USYM24UCDSA Medium Static Ducted AM24LP2VHA Co...

Page 2: ...Aug 2020 Manual release Revision History ...

Page 3: ...ode A 6 Heat Mode A 7 Indoor Fan Control A 7 Cold Air Proof Operation A 7 Timing A 7 Indoor System Mode Conflict A 7 Abnormality Confirmation Approaches A 8 Low Load Protection Control A 8 High Load Protection Control A 8 When the Compressor First Starts A 8 The Outdoor Fan Control Exchange Fan A 8 The Outdoor Fan Control When In Cooling or Dehumidifying Mode A 8 The Control of the Outdoor Unit Ex...

Page 4: ...ical connections between the indoor and outdoor units Firmly clamp the interconnecting wires so they receive no external stresses Incomplete connections or clamping may cause terminal over heating or fire After completing interconnecting and supply wiring connections shape the cables so that they do not put undue force on the electrical covers or panels Install covers over the wires Incomplete cov...

Page 5: ...ed Heating Capacity 47 F Btu hr 18 000 22 000 33 000 Heating Capacity Range Btu hr 6 100 22 100 6 100 25 000 6 100 35 000 Rated Power Input W 1 700 2 100 3 000 HSPF 8 5 8 5 9 0 Rated Heating Capacity 17 F Btu hr 10 000 14 000 21 000 OutdoorUnit Maximum Fuse Size A 25 25 30 Minimum Circuit Amp A 15 18 23 Outdoor Fan Speed RPM 300 900 300 900 300 900 Outdoor Noise Level dB 53 54 56 Dimension Height ...

Page 6: ... 38 35 29 26 23 31 29 23 29 25 38 35 32 29 Dimension HxWxD in mm 7 5 16 x 33 7 16 x16 9 16 185x850x420 7 5 16 x 33 7 16 x16 9 16 185x850x420 7 5 16 x 33 7 16 x16 9 16 185x850x420 7 5 16 x 46 1 16 x16 9 16 185x1170x420 9 7 8 x 37 5 8 x 25 3 4 250x957x655 Weight Ship Net lbs kg 47 2 36 8 21 4 16 7 47 2 36 8 21 4 16 7 47 2 36 8 21 4 16 7 61 8 48 5 28 22 68 8 81 1 31 2 36 8 Liquid Suction O D in 1 4 3...

Page 7: ...dCoolingCapacityBtu hr 9 000 12 000 15 000 RatedHeatingCapacityBtu hr 10 000 13 000 18 000 Voltage Cycle PhaseV Hz 208 230 60 1 208 230 60 1 208 230 60 1 Airflow Turbo High Med Low Quiet CFM 264 235 205 176 147 294 264 205 176 147 341 311 282 252 223 IndoorSoundLeveldB Turbo High Med Low Quiet 40 32 25 20 42 34 26 21 46 37 33 28 ChassisDimension HxWxDin mm 23 6 27 5 8 3 600 700 210 Weight Ship Net...

Page 8: ...the compressor will be stopped and the malfunction will be recorded in the malfunction list The indoor system will continue to run When the temperature of the indoor coil is raised to 45 F the compressor will be restarted again the requirement of 3 minutes delay should be satisfied Dry Mode Dehumidifying Mode Temperature control range 60 86 F Temperature difference 2 F Control feature Send the deh...

Page 9: ...efrosting finishes the coil malfunction will still be neglected until the compressor has been started up for 30 seconds The indoor temperature display will not change and the system operates at the cold air proof mode Automatic heating temperature compensation when the system enters the heating mode the temperature compensation 4 will be added When the status is switched off the compensation will ...

Page 10: ...ted when the coil temperature is below 108 F and the system has been stopped for 3 minutes The malfunction will be stored in the malfunction resume and will not be revealed When the Compressor First Starts The compressor will start in low frequency After a brief time delay the compressor will come up to operating speed to meet the demand requirement for capacity The Outdoor Fan Control Exchange Fa...

Page 11: ... sensor reads temperatures in excess of 131F Conditions that cause high indoor coil temperature include indoor fan failure dirty indoor coil and operating the system in heat mode when outdoor air temperatures exceed operating limit Too warm outside Should this routine be initiated the system will reduce compressor frequency until the indoor coil temperature reaches 117F Once this is achieved the s...

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Page 13: ... Way Valve Control During Heating Mode B 12 Crankcase Heater Control B 12 On Demand Defrost Logic B 12 Initiating Forced Defrost Operation B 13 Defrosting Time Flowchart B 13 Frequency Control and Compressor Discharge Line Temperature B 13 Frequency Control when there is CT Over current Protection B 13 High Pressure Protection B 13 Low Pressure Protection B 13 Forced Defrost Operation B 14 Prevent...

Page 14: ...the system All other indoor units must now operate in the same mode as the first unit that was energized 2 4 5 6 3 1 1 2 6 3 4 5 The Module Circuit Board generates 3 phase DC power to operate the variable speed compressor The compressor is connected to the MCB via terminals CN 5 CN 6 and CN 7 A Reactor Coil is connected to the MCB at terminals CN 3 and CN 4 The Reactor Coil will filter out electri...

Page 15: ...vaporator circuit These sensors are mounted in a group near the center of the circuit board There are 6 system temperature sensors that monitor refrigerant line temperature and outdoor air temperatures These sensors plug into the ECU via 2 Plugs CN 14 and CN 7 The system has two refrigerant pressure switches a Low Pressure Switch and a High Pressure Switch These switches are connected to the ECU v...

Page 16: ...le to the Electronic Control Board and the Compressor Module board their respective GREEN LED indicators will be flashing if the unit is in standby or continuously lit if the system is running If the GREEN LED is not lit there may not be power to either the PCB or the board receiving power from the PCB The Power Control Board does not have a power indicating LED 6 There is a communication plug lab...

Page 17: ...open during a call for cooling or heating mode operation the system will shut off the compressor and display an error code If the pressure rises to re close the switch the compressor will re start and continue on with normal operation Multiple cycles of opening and closing the switch will cause the system to lock out and display an Error Code 43 Causes of low refrigerant pressure include leaks und...

Page 18: ...e line If the line becomes too hot or cool the position of the EEV may be altered to ensure the compressor is not damaged by a lack of refrigerant flow or liquid floodback The compressor is a variable speed dual rotary type compressor The compressor has a built in accumulator to protect against liquid floodback during running operation A factory supplied crankcase heater will protect the compresso...

Page 19: ...e leaving liquid temperature from the EEV and the returning Suction Vapor temperature from the indoor units The difference between the two temperatures is used to calculate the operational suction vapor superheat level of each calling indoor unit These sensors are labeled Tc1 and Tc2 on the schematic drawing They plug into the ECU unit on a series of plugs located near the center of the circuit bo...

Page 20: ...e 5 8 3 8 Strainer Unit A liquid pipe temp sensor Indoor unit A Strainer Unit B liquid pipe temp sensor Indoor unit B Strainer Unit C liquid pipe temp sensor Indoor unit C Strainer Unit D liquid pipe temp sensor Indoor unit D Unit A gas pipe temp sensor Unit B gas pipe temp sensor Unit C gas pipe temp sensor Unit D gas pipe temp sensor Indoor unit A Indoor unit B Indoor unit C Indoor unit D 4 way ...

Page 21: ...NIT s EEV The EEV will drop the pressure of the liquid to low pressure low temperature 5 Temperature Sensor Tc2 The EEV associated Liquid Pipe Sensor will monitor the temperature of the refrigerant leaving the EEV to calculate system superheat The low pressure low temperature refrigerant will enter the mixed phase liquid line and travel to the indoor unit Heat from the air passing across the indoo...

Page 22: ... When the compressor starts the compressor will discharge hot gas into the oil separator Oil will be trapped in the separator and returned to the suction inlet of the compressor via the capillary tube assembly low pressure path Heating Mode Sequence of Operation 4U36HS1ERE 4U36MS2VHB Comp ressor Discharge temp sensor Oil separator Capillary tube High pressure switch 4 way valve Pipe sensor Toci Su...

Page 23: ...ver where excess refrigerant will store After the liquid leaves the Liquid Receiver it will enter the restriction of the OUTDOOR UNIT s EEV The EEV will drop the pressure of the liquid to low pressure low temperature Heat from the outdoor air will boil off the cold refrigerant The outdoor coil absorbs heat from the outdoor air The refrigerant vapor boiling from the liquid refrigerant in the outdoo...

Page 24: ...they are Outdoor air temperature Sensor Ta and Outdoor coil temperature Sensor Te To enter a defrost cycle on demand the system must be in heat mode and the compressor must have run for 10 minutes continuously and 45 minutes of compressor run time in heat mode must have accumulated If the following conditions have been met for at least 5 continuous minutes the system will enter a demand defrost cy...

Page 25: ...ignal of low pressure switch is low level 0 for 1 2 When compressor no running if output signal of low pressure switch is low level 0 for 30 156 154 151 147 144 140 code to indoor Meanwhiel by controling the max condensating temp Tc cooling or module temp sensor TmAVE please confirm as follow 71 High Pressure Protection If abnormally high refrigerant circuit condensing pressure is detected the hig...

Page 26: ...QY 20HZ SV2 OFF 20HZ SV2 ON 20HZ Keep for 5 seconds unit stops and alarm occurs 3 minutes later restart up If it occurs 3 times in 1 hour it will always alarm and stop electrify again and failure will be cleared 13 22 31 40 49 49 40 31 22 58 72 Preventing Compressor Overcurrent During compressor start up if the current of the compressor is greater than 17A for 3 seconds the compressor will stop an...

Page 27: ...o operate This is the feedback voltage to the PCB for determining the speed of the fan motor If the outdoor fan initially runs increases speed then stops and the Service Monitor Board indicates an error code of 09 the feedback circuit is not functioning Check that the wiring and plug connections are in good condition Outdoor Fan 310VDC Pins 1 3 Outdoor Fan 15VDC Pins 3 4 Outdoor Fan Control Pins 3...

Page 28: ...he solenoid coil will have to be replaced 5 If the coil resistance is within the tolerance use a magnet along the valve body to determine the location of the piston If one end of the piston is against the end of the valve body it is stuck and the valve must be replaced 6 Partial shifting of the valve can be detected by measuring the temperature of the suction gas where it enters the reversing valv...

Page 29: ... identifier 7 Repeat process outlined in step 5 Repair or replace the wires if the compressor windings check properly 8 Check each terminal to ground suction line connection at compressor to check for grounded windings if the resistance values are not correct 9 Replace the compressor if the winding measurements are greater than 7 out of specification 1 Disconnect power to the outdoor unit 2 Set Di...

Page 30: ...OUTDOOR TECHNICAL OVERVIEW B 18 ENGLISH Wiring Diagrams 2U18MS2VHB ...

Page 31: ...OUTDOOR TECHNICAL OVERVIEW B 19 ENGLISH Wiring Diagrams 3U24MS2VHB ...

Page 32: ...OUTDOOR TECHNICAL OVERVIEW B 20 ENGLISH Wiring Diagrams 4U36MS2VHB ...

Page 33: ... OFF invalid ON valid 3500W 2 Quiet operation If OFF the outdoor unit will calculate and obtain the average ambient temperature of the unit within the last 24 hours Tao_average_24 Then compare the current ambient temperature with the ambient temperature average Tao_average_24 and combine it with the previous ambient temperature trend to determine whether it can enter Quiet operation low compressor...

Page 34: ... ON ON Slave 14 OFF ON ON ON Slave 15 ON ON ON ON Outdoor central control address settings Definition SW1 1 SW1 2 SW1 3 SW1 4 Default From Factory Normal Operations OFF OFF OFF OFF Forced Heating ON OFF OFF OFF Forced Cooling OFF ON OFF OFF Rated Condition Operations Factory Testing OFF OFF ON OFF Set Enhanced Defrost OFF OFF OFF ON Wiring Error Check ON ON ON ON Description SW7 1 SW7 2 SW7 3 SW7 ...

Page 35: ...33 Gas pipe sensor failure Circuit B 34 Gas pipe sensor failure Circuit C 35 Gas pipe sensor failure Circuit D 36 Gas pipe sensor failure Circuit E 38 Malfunction of module temperature sensor momentary power failure detection 39 Malfunction of condensing temperature sensor 40 Liquid pipe sensor failure Circuit E 41 Toci temperature sensor failure 42 High Pressure switch open 43 Low Pressure switch...

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Page 37: ... Wall Mount Unit Circuit Board C 3 Testing C 5 Accessing Components Removing Cover C 5 Indoor Fan Motor Voltage Check C 6 Replacing the Blower Motor C 6 Testing Temperature Sensors C 8 Testing Louver Motors C 8 Testing Communication Circuit C 8 Wiring Diagram C 9 Error Codes C 10 AW07LC2VHB AW09LC2VHB AW12LC2VHB AW18LC2VHB AW24LP2VHA ...

Page 38: ...hould the feedback signal not be present during a call for indoor blower the indoor control board will indicate a Malfunction Code E14 Louver Stepper Motors Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver motors are controlled via commands received from the remote control The blower motor is controlled by both the remote control and by co...

Page 39: ...ing functions of the indoor unit All control decisions are made by the outdoor unit ECU The indoor board has some limited diagnostic capability which will be covered in this manual Evaporator Coil Indoor Wall Mount Unit Circuit Board 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 10 11 9 The Indoor Unit Circuit Board communicates with the outdoor unit ECU via a connection at Terminal Block screw 3 The da...

Page 40: ...is open The indoor unit temperature sensors are connected to the control board When testing the calibration of these sensors the wires can be released from the plug by pressing on the tension tab on the side of the plug The receiver display unit that is mounted to the front cover of the indoor unit plugs into the control board There are two to three motors connected to the control board that contr...

Page 41: ...ead screws located near the bottom of the indoor unit These screws are located directly below the bottom of the air filter 4 Remove the filters 5 Manually open the louver 7 Remove the three screws located behind the caps 8 Remove the two screws that hold the digital display to the front cover The display can hang free 9 Release the air temperature sensor from the clip that holds it 10 Pull upward ...

Page 42: ...he indoor board is bad If voltage is present continue on 2 Check the voltage between Pins 3 and 4 The voltage should be 15VDC If it is not present the board is bad If voltage is present continue on 3 Check for voltage between Pins 3 and 6 If no DC voltage is present the board is bad If voltage is present change the motor 3 Remove the cover from the electrical box on the right side of the indoor un...

Page 43: ...orator coil and remove the motor bracket 8 Loosen the motor shaft set screw Phillips head screw 9 Unplug the motor from the circuit board 10 Lift and slide the motor away from the blower wheel 11 Remove the two black anti vibration mounts from the defective motor and place them on the new motor 12 Install new motor in reverse order ...

Page 44: ...board is bad or the louver motor is defective It is more likely the motor is defective than the board Make sure the louver assembly is not binding and keeping the vanes from moving 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board Testing Communication Circuit If an Error E7 occurs perform the following test to determine if the indoor control board is functio...

Page 45: ...WALL MOUNT TECHNICAL OVERVIEW C 9 ENGLISH Topic Title Wiring Diagrams ...

Page 46: ...Indoor anti frosting protection F5 23 Module thermal overload F2 24 Compressor start failure over current F23 25 Phase current protection IPM F9 26 MCU reset F24 27 Module current detect circuit malfunction F10 28 Liquid pipe sensor failure Circuit A F16 29 Liquid pipe sensor failure Circuit B F17 30 Liquid pipe sensor failure Circuit C F18 31 Liquid pipe sensor failure Circuit D F29 32 Gas pipe s...

Page 47: ...sting D 5 Accessing the Blower Motor and Condensate Pump D 5 Removing Fan Motor D 5 Removing Condensate Pump D 5 Indoor Fan Motor Test Procedure D 6 Testing Temperature Sensors D 6 Testing Louver Motors D 7 Testing Communication Circuit D 7 Test Condensate Pump and Associated Float Switch D 8 Wiring Diagram DIP Switch Settings D 9 Error Codes D 10 AB09SC2VHA AB12SC2VHA AB18SC2VHA ...

Page 48: ... These wires should always be 14 gauge AWG Stranded type wire Splices in wires 1 or 3 may cause communication errors Motor Blower The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver motors are controlled via commands r...

Page 49: ...l temperature information to the ECU that may be used in frequency adjustments Ambient Temperature Sensor The Ambient Temperature Sensor senses room temperature This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control Control Board The indoor unit circuit board controls the switching functions of the indoor unit All control decisions...

Page 50: ...ard the Display Power Indicator will be lit The control board has a replaceable 3 15A 250V fuse that protects against excessive current If power is present at the board but the board does not work check for continuity through the fuse Replace if the fuse is open The indoor unit temperature sensors are connected at Plug CN 13 When testing the calibration of these sensors the wires can be released f...

Page 51: ... condensate pump 3 Remove assembly 8 Slide condensate pan from cassette 2 Fan blade will slide off motor shaft 3 Remove Phillips head screw holding cover plate over motor wiring leads 4 Remove 3 nuts that hold fan motor in place 5 Fan motor will come loose 3 Disconnect the main power wire to the indoor unit 4 Unplug the condensate pump and float switch from wiring harness 5 Unplug fan motor from w...

Page 52: ...ollowing 1 Confirm the sensor is firmly attached to the circuit board connection plug 2 Remove the sensor wires form the connection plug by releasing holding tension on the plugs tension tab 3 Use an ohmmeter to test the electrical resistance of the sensor 4 Measure the air temperature near the sensor and compare the required resistance against measured resistance See chart in reference section If...

Page 53: ...ing 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board 3 Identify the inoperable louver motor on the schematic drawing below and disconnect the plug from the circuit board 4 Use an Ohmmeter to test the electrical continuity of the louver motor windings The proper resistance for each winding can be found in this table If the motor winding resistance is erratic ...

Page 54: ...control box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump connector on the board There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective 2 4 5 When installing the condensate discharge port...

Page 55: ...11 29 BM1 1 BM1 7 BM1 8 TYPE DEFINE OFF OFF BM1 2 BM1 3 BTU B BLACK R RED W WHITE Y G YELLOW GREEN TEMP SENSOR ROOM SENSOR FLOAT SWITCH HEATER PUMP UP DOWN CN9 CN1 CN6 PANNEL CN4 CN11 CN19 CN13 CN3 ON CN35 CN21 T5A 250VAC FUSE BM3 2 1 3 B W R Y G OFF OFF OFF ON OFF OFF OFF ON OFF ON ON OFF OFF OFF ON ON OFF ON OFF ON ON ON ON ON 9000 12000 18000 24000 28000 36000 48000 60000 NOTE1 DASHED PART ARE ...

Page 56: ...ed 4 2 Indoor anti frosting protection 4 3 23 Module thermal overload 4 4 24 Compressor start failure over current 4 5 25 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 ...

Page 57: ...Board E 4 Testing E 5 Accessing the Blower Motor and Condensate Pump E 5 Removing Fan Motor E 5 Removing Condensate Pump E 5 Indoor Fan Motor Test Procedure E 6 Testing Temperature Sensors E 6 Testing Louver Motors E 7 Testing Communication Circuit E 7 Test Condensate Pump and Float Switch E 8 Wiring Diagram E 9 DIP Switch Settings E 10 Error Codes E 11 AL24LP2VHA ...

Page 58: ...Wires 1 and 3 complete the data path These wires should always be 14 gauge AWG Stranded type wire Splices in wires 1 or 3 may cause communication errors Motor Blower The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit Separate motors located in the indoor unit control the operation of the motorized louvers All of the louver ...

Page 59: ...mperature information to the ECU that may be used in frequency adjustments Ambient Temperature Sensor The Ambient Temperature Sensor senses room temperature This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control Control Board The indoor unit circuit board controls the switching functions of the indoor unit All control decisions are...

Page 60: ...Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2 Power connects from these terminal connections to CH 3 and CH 4 on the circuit board If the board does not respond to commands and has no display check for line voltage at these connections When power is present at the indoor board the Display Power Indicator will be lit The control board has a replaceable 3 15A 2...

Page 61: ...ondensate water from the pan by removing drain plug 10 Remove the screws holding on the condensate pan 2 Fan blade will slide off motor shaft 3 Remove Phillips head screw holding cover plate over motor wiring leads 4 Remove 3 nuts that hold fan motor in place 5 Fan motor will come loose 3 Disconnect the main power wire to the indoor unit 4 Unplug the condensate pump and float switch from wiring ha...

Page 62: ...he following 1 Confirm the sensor is firmly attached to the circuit board connection plug 2 Remove the sensor wires form the connection plug by releasing holding tension on the plugs tension tab 3 Use an ohmmeter to test the electrical resistance of the sensor 4 Measure the air temperature near the sensor and compare the required resistance against measured resistance See chart in reference sectio...

Page 63: ...s If the louver does not operate with command from the remote control either the indoor board is bad or the louver motor is defective It is more likely the motor is defective than the board Make sure the louver assembly is not binding and keeping the vanes from moving 1 Remove power from the unit and remove the indoor unit cover 2 Access the circuit board 3 Identify the inoperable louver motor on ...

Page 64: ...l box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump connector on the board There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective 2 4 5 When installing the condensate discharge port at th...

Page 65: ...ROLLER M SENSOR TEMP ROOM ROOM CARD CN3 CN6 T5A 250VAC CN16 DRAIN PUMP M CN9 CN10 CN4 CN14 FUSE FLOAT SWITCH CN13 CN4 CN3 CN2 CN7 CN1 CN6 INTELLIGENT MOVE EYE DEVICE M M LOUVER STEP MOTOR4 LOUVER STEP MOTOR3 M M LOUVER STEP MOTOR2 LOUVER STEP MOTOR1 INDOOR UNIT MAIN CONTROL BOARD I R RECEIVER INFRARED REMOTE RECEIVER TEMP TEMPERATURE ON OFF ON CN26 AB M FRESHAIR MOTOR EXTERNALALARM OUTPUT FUNCTION...

Page 66: ...p default OFF Cooling only ON High performance cassette OFF OFF ON Indoor unit Address Indoor unit address for one wired controller control more than one unit BM3 5 BM3 6 BM3 7 BM3 8 0 master OFF OFF OFF OFF 1 slave OFF OFF OFF ON 2 slave OFF OFF ON OFF 3 slave OFF OFF ON ON 4 slave OFF ON OFF OFF 5 slave OFF ON OFF ON 6 slave OFF ON ON OFF 7 slave OFF ON ON ON 8 slave ON OFF OFF OFF 9 slave ON OF...

Page 67: ...3 2B 23 Module thermal overload 4 4 2C 24 Compressor start failure over current 4 5 2D 25 Phase current protection IPM 4 6 2E 26 MCU reset 4 7 2F 27 Module current detect circuit malfunction 4 8 30 28 Liquid pipe sensor failure Circuit A 4 9 31 29 Liquid pipe sensor failure Circuit B 5 0 32 30 Liquid pipe sensor failure Circuit C 5 1 33 31 Liquid pipe sensor failure Circuit D 5 2 34 32 Gas pipe se...

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Page 69: ...verview F 2 Indoor Unit Circuit Board F 3 Ductwork Grilles F 5 Testing F 6 Test Condensate Pump and Float Switch F 6 Testing Communication Circuit F 6 Testing Temperature Sensors F 7 Indoor Fan Motor Voltage Check F 7 Wiring Diagram DIP Switch Settings F 8 Error Codes F 9 AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB ...

Page 70: ...he blower assembly consists of 2 plastic blowers A set screw holds each blower wheel to the blower motor The indoor blower motor is connected to the indoor unit control board The wiring from the motor to indoor board consists of 5 wires connected to pins that deliver line voltage speed and feedback information During normal operation the indoor control board will energize the indoor blower motor a...

Page 71: ...board has some limited diagnostic capability which will be covered in this manual 1 4 7 10 2 5 8 11 3 6 9 12 L Terminal N Terminal Communication Terminal 5A 250V Fuse CN13 Sensors CN18 Float Switch CN1 Wired Remote DIP Switches CN14 Stepper Motor CN15 Stepper Motor CN6 Fan Motor CN9 Condensate Pump 1 4 7 10 2 5 8 11 3 6 9 12 1 If in COOL or DRY mode Compressor running Thermal ON then condensate pu...

Page 72: ...oor unit capacity Air Delivery Power is set with DIP Switches SW1 4 and SW1 5 The settings are shown in Hydrostatic Selection of 0Pa up to 30Pa SW1 7 and SW1 8 define the unit type The conversions are as follows 0Pa 0 w c 10Pa 04 w c 20Pa 08 w c 30Pa 12 w c Recommended settings are for motorized Louver set to 10Pa Ducting limited to a total of 12 w c External Static set to 30Pa Components The Indo...

Page 73: ...tion Air distribution Air return blind Air return duct Indoor unit Rivet gluey nail heat preservation cotton tinfoil gluey nail cap adhesive tape Roof Installation Ceiling Air supply Unit Return air Return air box Roof Air outlet grill Air supply Unit Return air box Return air Long Duct Suspending hook Drain pipe Air return duct Air return blind Air out duct Transition duct Tie in of air Distribut...

Page 74: ...ump connection There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective Testing Communication Circuit If an Error E7 occurs perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit Perform this test with the...

Page 75: ...the air temperature near the sensor and compare the required resistance against measured resistance refer to charts in reference section If the sensor is within calibration the sensor is good If the sensor is out of calibration replace the sensor Tube Sensors should be removed from socket and exposed to air temperature during test If The Indoor Fan Motor Does Not Run 1 Remove the front cover and a...

Page 76: ...IDGE CN22 CN23 ON SLAVE UNITS PCB SHOULD BE CUT OFF WHEN ONE WIRED CONTROLLER CONTROL MORE THAN ONE UNIT OFF OFF SW1 4 SW1 5 SW1 6 OFF OFF OFF ON TEMP SENSOR ROOM SENSOR PIPING TEMP ROOMCARD CN13 CN19 CN14 CH3 CN29 R O T O M N A F C D CN36 CN7 CN18 CN5 CN6 CN15 CN37 CN4 CH1 CH2 CN9 CN1 SW1 SW2 T5A 250VAC FUSE WIRED CONTROLLER RECEIVER FLOAT SWITCH U HOME REMOTE CENTRAL PANNEL CONTROLLER LEFT RIGHT...

Page 77: ...5 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 Gas pipe sensor failure Circuit A 5 3 33 Gas pipe sensor failure Circuit B 5 4 34 Gas pipe sensor failure Circuit C 5 5 ...

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Page 79: ...G 6 Testing G 7 Test Condensate Pump and Associated Float Switch G 7 Testing Temperature Sensors G 7 Testing Communication Circuit G 8 Indoor Fan Motor Voltage Check G 8 Static Pressure Charts G 9 Board Replacement G 10 Removing the Condensate Pump G 10 Removing Fan Motor G 10 Replacing WiFi Module G 11 Wiring Diagram G 12 DIP Switch Settings G 13 Error Codes G 14 USYM09UCDSA USYM12UCDSA USYM18UCD...

Page 80: ...are accessed under the removable panel next to the electrical control box The wired controller can be configured to sense room air temperature There is no option for use with remote control All operating status and information is displayed on the wired controller The Mid Static Ducted unit does not have a display 8 9 6 4 2 2 7 5 3 3 1 1 Evaporator Coil Blower Assembly The indoor unit features a DC...

Page 81: ...oard The pump is capable of minimal lift If high lift is required the water from the Mid Static Ducted unit should be pumped to a WiFi The unit comes shipped with a WiFi module that provides control via a smartphone app 1 If in COOL or DRY mode Compressor running Thermal ON then condensate pump is energized When compressor stops Thermal OFF condensate pump runs for an additional 5 minutes 2 If in ...

Page 82: ...nge From the ground connection at the Terminal Block to the Number 3 screw connection the voltage should pulse up and down when data is being transmitted Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2 Power connects from these terminal connections to CH 1 and CH 2 on the circuit board If the board does not respond to commands and has no display check for line ...

Page 83: ... cycle will be active until one of the following occurs Fresh air function is canceled via the controller wired controller or wireless remote controller Indoor unit has been via the controller In Heating mode The fresh air output will maintain a 20 minutes ON 20 minutes OFF cycle after the compressor starts This cycle will be active until one of the following occurs Fresh air function is canceled ...

Page 84: ...on Air distribution Air return blind Air return duct Indoor unit Rivet gluey nail heat preservation cotton tinfoil gluey nail cap adhesive tape Roof Installation Ceiling Air supply Unit Return air Return air box Roof Air outlet grill Air supply Unit Return air box Return air Long Duct Suspending hook Drain pipe Air return duct Air return blind Air out duct Transition duct Tie in of air Distributio...

Page 85: ...e internal condensate pump does not operate the pump may be bad or the float switch may be defective Perform the following test 1 Access the electrical control box 2 Unplug the float switch from the circuit board 3 The pump should start 4 If the pump does not start check for voltage at the pump control board connection There should be 230 Volts AC to the pump If there is not the circuit board is d...

Page 86: ... and 23VDC The fluctuating signal indicates a good communication path 3 If the voltage does not fluctuate and the wiring is good the indoor board is defective If The Indoor Fan Motor Does Not Run 1 Remove the front cover and access the fan motor circuit board connection 2 Reset power and turn the remote control fan command to Fan On mode Motor Test 1 If the motor doesn t run check for 310VDC betwe...

Page 87: ... 0 10 0 15 0 20 0 28 0 36 0 40 0 44 0 48 0 52 Air flow cfm Static pressure in wc AM09SL2VHA air flow and static pressure chart High cfm Med cfm Low cfm Quiet cfm USYM12UCDSA ENGLISH 350 0 400 0 450 0 500 0 550 0 600 0 650 0 0 10 0 15 0 20 0 28 0 36 0 40 0 44 0 48 0 52 0 60 Air flow cfm Static pressure in wc AM18SL2VHA air flow and static pressure chart High cfm Med cfm Low cfm Quiet cfm 400 0 450 ...

Page 88: ...all connectors from the board 3 Remove the 2 board mounting screws and remove the board 2 Unplug the pump motor and float switch wires from within the air inlet 3 Remove the 4 screws holding the pump in place 4 Tilt the pump out from the top and pull out 5 Pull wires through rubber grommets and remove pump assembly Removing Fan Motor 1 Remove control board cover 2 Unplug motor wires ...

Page 89: ...e screws holding the blower housing to the unit 4 on each housing 8 Support the motor 2 people may be required at this time Loosen the 2 screws of the motor mount bracket and remove full assembly 9 Using a long 4mm hex wrench loosen the set screws from the blower wheel and remove from motor shaft Replacing WiFi Module 1 Unplug existing WiFi module 2 Insert new WiFi module 3 Replace the wifi passco...

Page 90: ...switches setting without technical support 4 Get details from trouble shooting list about LED indication 5 Abbreviation RD red W withe BLK black BLU blue GRN green YL yellow Y G yellow green E A O external alarm output Tr indoor unit ambient room temperature sensor Tp indoor unit pipe coil temperature sensor 6 The port CN4 CN10are dry contact output port for particular use do not connect other dev...

Page 91: ...arm output ON Without filter clean warning OFF With filter clean warning ON North America area OFF Non North America area ON Description SW3 1 SW3 2 SW3 3 SW3 4 Special fresh air Canadian ventilation mode Canada particular Area invalid OFF Special fresh air Canadian ventilation mode Canada particular Area valid ON Console MESP Duct OFF Cassette Reserved ON Auxiliary heater invalid OFF Auxiliary he...

Page 92: ...4 3 23 Module thermal overload 4 4 24 Compressor start failure over current 4 5 25 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 Gas pipe sensor failure Circuit A 5 3 3...

Page 93: ...Contents Components H 2 Component Overview H 2 Indoor Unit Circuit Board H 3 Ductwork Grilles H 5 Testing H 6 Test Condensate Pump and Float Switch H 6 Testing Communication Circuit H 6 Testing Temperature Sensors H 7 Indoor Fan Motor Voltage Check H 7 Wiring Diagram H 8 DIP Switch Settings H 9 Error Codes H 10 AM24LP2VHA ...

Page 94: ...e with remote control All operating status and information is displayed on the wired controller The Medium Static Ducted unit does not have a display Medium Static Ducted units are controlled by a wired controller only 8 8 6 4 4 2 2 7 5 5 3 3 1 1 Evaporator Coil Blower Assembly The indoor unit features a DC variable speed dual shaft blower motor that will change speed to match the capacity demand ...

Page 95: ...ft is required the water from the Medium Static Ducted unit should be pumped to a field supplied condensate pump that is capable of high lift Indoor Unit Circuit Board The indoor unit circuit board controls the switching functions of the indoor unit All control decisions are made by the outdoor unit ECU The indoor board has some limited diagnostic capability which will be covered in this manual 1 ...

Page 96: ...in the louver assembly The blower motor is connected to the circuit board at plug CN 6 Components The Indoor Unit Circuit Board communicates with the outdoor unit ECU via a connection at Terminal Block screw 3 The data pulse that sends the communication information can be measured with a voltmeter placed to DCV range From the ground connection at the Terminal Block to the Number 3 screw connection...

Page 97: ...r distribution Air distribution Air return blind Air return duct Indoor unit Rivet gluey nail heat preservation cotton tinfoil gluey nail cap adhesive tape Roof Installation Ceiling Air supply Unit Return air Return air box Roof Air outlet grill Air supply Unit Return air box Return air Long Duct Suspending hook Drain pipe Air return duct Air return blind Air out duct Transition duct Tie in of air...

Page 98: ... control board connection There should be 230 Volts AC to the pump If there is not the circuit board is defective If there is proper voltage to the pump either the pump or associated pump wiring is defective Testing Communication Circuit If an Error E7 occurs perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit Perform this te...

Page 99: ...4 Measure the air temperature near the sensor and compare the required resistance against measured resistance refer to charts in reference section If the sensor is within calibration the sensor is good If the sensor is out of calibration replace the sensor Tube Sensors should be removed from socket and exposed to air temperature during test If The Indoor Fan Motor Does Not Run 1 Remove the front c...

Page 100: ...MEDIUM STATIC DUCTED PRO SERIES TECHNICAL OVERVIEW H8 ENGLISH Topic Title Wiring Diagram ...

Page 101: ...remind ON ESP DUCT USA OFF 0 EU Australia ON Indoor unit Address Indoor unit address for one wired controller control more than one unit SW3 5 SW3 6 SW3 7 SW3 8 0 master OFF OFF OFF OFF 1 slave OFF OFF OFF ON 2 slave OFF OFF ON OFF 3 slave OFF OFF ON ON 4 slave OFF ON OFF OFF 5 slave OFF ON OFF ON 6 slave OFF ON ON OFF 7 slave OFF ON ON ON 8 slave ON OFF OFF OFF 9 slave ON OFF OFF ON 10 slave ON O...

Page 102: ...4 5 25 Phase current protection IPM 4 6 26 MCU reset 4 7 27 Module current detect circuit malfunction 4 8 28 Liquid pipe sensor failure Circuit A 4 9 29 Liquid pipe sensor failure Circuit B 5 0 30 Liquid pipe sensor failure Circuit C 5 1 31 Liquid pipe sensor failure Circuit D 5 2 32 Gas pipe sensor failure Circuit A 5 3 33 Gas pipe sensor failure Circuit B 5 4 34 Gas pipe sensor failure Circuit C...

Page 103: ... Front Cover Removal I 4 Control Box Removal I 4 Board Replacement I 4 Upper Louver Removal I 5 Lower Damper Assembly Removal I 5 Replace Fan Motor I 5 Indoor Fan Motor Test Procedure I 6 Testing Temperature Sensors I 7 Testing Louver Motors I 7 Testing Communication Circuit I 8 Replacing WiFi Module I 8 Wiring Diagram DIP Switch Settings I 9 Error Codes I 10 USYF09UCDWA USYF12UCDWA USYF18UCDWA ...

Page 104: ...ent Temperature Sensor senses room temperature This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control WiFi Module Coil Sensor The Coil Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode This sensor is used for Anti Freezing and Anti Cold Blow cycles The sensor also provides critical temper...

Page 105: ... power the indoor unit is made on terminal block connections 1 and 2 Power connects from these terminal connections to CH 3 and CH 4 on the circuit board If the board does not respond to command and has no display check for line voltage at these connections When power is present at the indoor board the Display Power Indicator will be lit The control board has a replaceable 3 15A 250V fuse that pro...

Page 106: ...ntal louver Lift up the top edge of the front cover and then pull forward Control Box Removal 1 Remove the screw from the right side of the box cover 2 Lift up the panel that contains the diagnostic port wifi module and ambient sensor And remove the box cover 3 Unplug the three connectors for the fan motor upper louver and bottom damper 4 Remove the ground screw 5 Remove the mounting screw for the...

Page 107: ...ate the bottom of the assembly outward Note When re installing the damper assembly first place the front edge of the condensate drain pan into place then rotate the bottom of the assembly into position Replace Fan Motor 1 Remove filter cover front panel control box upper louver and bottom damper 2 Remove the white plastic strap that hold the line set in place on the right side of the unit 3 Locate...

Page 108: ...n air cover and access the fan motor circuit board connection 3 Reset power and turn the remote control fan command to Fan On mode Motor Test 1 If the motor doesn t run check for 310VDC between Pins 1 and 3 If it is not present the indoor board is bad If voltage is present continue on 2 Check the voltage between Pins 3 and 4 The voltage should be 15VDC If it is not present the board is bad If volt...

Page 109: ...breviation R red B black BL blue W white Y G yellow green TEMP temperature E A O exrernal alarm output Tr indoor unit room temperature sensor Tp indoor unit pipe temperature sensor coil temperature sensor Wired c display 07 flas upper Outdoo 20 cor HEX co Tp Tr SW1 1 OFF OFF SW1 2 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF ON SW1 3 SW1 4 SW1 5 SW1 6 SW1 7 SW...

Page 110: ...nit are correct There should no splices between the indoor and outdoor unit wiring connecting terminals 1 or 3 Make sure wiring is correct before performing this test 1 Measure the DC voltage between terminals 1 and 3 on the indoor terminal block 2 The voltage should fluctuate between 8VDC and 23VDC The fluctuating signal indicates a good communication path 3 If the voltage does not fluctuate and ...

Page 111: ... unit pipe temperature sensor coil temperature sensor Wire disp 07 upp Out 20 HEX Tp Tr SW1 1 OFF OFF SW1 2 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF ON SW1 3 SW1 4 SW1 5 SW1 6 SW1 7 SW1 8 To Outdoor Unit All Console default MODEL DIP switches factory default setting L2 L1 Note SW1 LED5 LED4 250VAC T5A FUSE CN20 CN22 22 1 CN31 CN11 CN35 Main control board S...

Page 112: ...M F9 26 MCU reset F24 27 Module current detect circuit malfunction F10 28 Liquid pipe sensor failure Circuit A F16 29 Liquid pipe sensor failure Circuit B F17 30 Liquid pipe sensor failure Circuit C F18 31 Liquid pipe sensor failure Circuit D F29 32 Gas pipe sensor failure Circuit A F30 33 Gas pipe sensor failure Circuit B F31 34 Gas pipe sensor failure Circuit C F32 35 Gas pipe sensor failure Cir...

Page 113: ...r Codes Related to the IPM J 18 Error Codes Related to Compressor Outdoor Fan 4 Way Valve J 19 Flow Charts J 20 1 Outdoor EEPROM Malfunction J 20 2 Outdoor IPM over current or short circuit J 20 4 Communication abnormal between PCB and IPM J 21 6 DC voltage or AC voltage high J 21 8 Discharge temperature too high protection J 22 9 DC fan motor fault J 22 10 Outdoor defrosting temp sensor Te abnorm...

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Page 115: ...mes within 5 seconds You will hear 2 beeps as confirmation Forced Defrost This will force the unit to run a Defrost Cycle Wireless Controller Set the unit to HEAT 30 C and High fan speed Press the Sleep button 6 times within 5 seconds You will hear 3 beeps as a confirmation Indoor Temperature Display Highwall Only This function will allow you to set the display to show either the Ambient temperatu...

Page 116: ...0011001066 WJ26X25213 YR HG Chart 4 Highwall AW12EH2VHA A0011001066 WJ26X25213 YR HG Chart 4 Highwall AW18EH2VHA A0011007590 WJ26X25413 YR HG Chart 4 Highwall AW07LC2VHB A0011800281CA WJ26X23928 YR HG Chart 4 Highwall AW09LC2VHB A0011800281CA WJ26X23928 YR HG Chart 4 Highwall AW12LC2VHB A0011800281CA WJ26X23928 YR HG Chart 4 Highwall AW18LC2VHB A0011800281FA WJ26X23929 YR HG Chart 4 Console USYF09...

Page 117: ...er from the indoor unit PCB 2 Apply power to the unit 3 Press the ON OFF button on the remote control HBS 01 4 Ignore this step if the display temperature is already O C Press MENU O F button to switch the display temperature to O C then press confirm 5 Set the remote controller for HEAT mode operation and set the temperature to 24O C 6 Aim the controller at the infrared signal receiver and press ...

Page 118: ... C A 24 12 36K C A 18 18 36K D 18 24 42K A B 24 24 48K B C A x2 Three Zone 9 9 9 27K E 12 9 7 28K E 12 9 9 30K E 12 12 7 31K E 18 7 7 32K 12 12 9 33K E 18 9 7 34K 18 9 9 36K 12 12 12 36K E 18 12 7 37K 24 7 7 38K C A 18 12 9 39K 24 9 7 40K C A 24 9 9 42K C A 18 12 12 42K 24 12 7 43K C A 24 12 9 45K C A 18 18 12 48K D 24 12 12 48K C A Four Zone 7 7 7 7 28K E 9 7 7 7 30K E 9 9 7 7 32K E 12 7 7 7 33K ...

Page 119: ...22 11 33 26 521 592 18 73 4 23 10 86 25 283 563 66 75 2 24 10 42 24 111 536 65 77 25 10 00 23 511 08 78 8 26 9 60 21 947 486 94 F C Normal KΩ 10K SENSORS 23K SENSORS 50K SENSORS 80 6 27 9 21 20 949 464 05 82 4 28 8 85 20 003 442 35 84 2 29 8 50 19 104 421 77 86 30 8 16 18 252 402 24 87 8 31 7 84 17 442 383 72 89 6 32 7 54 16 674 366 13 91 4 33 7 25 15 943 349 43 93 2 34 6 97 15 249 333 58 95 35 6 ...

Page 120: ...e 383 Ω 388 Ω 390 Ω 195 Ω Violet 381 Ω 385 Ω 189 Ω Yellow 388 Ω 193 Ω Orange 196 Ω Red EEV 6 pin 6 wire White Yellow Orange Blue Brown Red White OL 92 Ω OL 46 Ω OL Yellow OL 92 Ω OL 46 Ω Orange OL 46 Ω OL Blue OL 46 Ω Brown OL Red EEV 6 pin 5 wire White Yellow Orange Blue X Red White 92 Ω 92 Ω 92 Ω 46 Ω Yellow 92 Ω 92 Ω 46 Ω Orange 92 Ω 46 Ω Blue 46 Ω X Red Highwall Horizontal Louver Motor Orange ...

Page 121: ... 1MΩ 5 Blank Blank Blank 4 GND GND GND 3 Vcc GND 1MΩ 2 Vsp GND 135KΩ 1 FG GND 1MΩ DC Fan Motor Pin Identification PIN Color Abbr Definition 1 Blue FG Revolution Pulse Output 2 Yellow Vsp Speed Control Voltage Input 3 White Vcc Control Power Voltage Input 4 Black GND Ground 5 Blank Blank Blank 6 Red Vdc Motor Driver Voltage Input DC Motor 310 VDC DC Ground 15 VDC Signal Feedback Red Black White Yel...

Page 122: ...TROUBLESHOOTING REFERENCES J 10 ENGLISH Refrigeration Diagrams 3U24MS2VHB Refrigerant Diagram ...

Page 123: ...TROUBLESHOOTING REFERENCES J 11 ENGLISH Refrigeration Diagrams 4U36MS2VHB REFERENCES PAGE 101 NGLISH ...

Page 124: ...ensor failure F6 F6 3 2 13 13 13 Discharge temperature sensor failure F25 F25 3 3 14 High outdoor suction temperature F30 F30 3 4 14 PFC circuit loop voltage 15 15 15 Communication failure between the indoor outdoor unit E7 E7 3 5 16 16 16 Lack of refrigerant or discharging F13 F13 3 6 17 17 17 4 way valve switching failure F14 F14 3 7 18 18 18 Loss of synchronism detection F11 F11 3 8 19 Position...

Page 125: ... 5 2 5 19 25 2 6 1A 2 6 2 6 2 6 1A 26 2 7 1B 2 7 2 7 2 7 1B 27 2 8 1C 2 8 2 8 2 8 1C 28 2 9 1D 2 9 2 9 2 9 1D 29 3 0 1E 3 0 3 0 3 0 1E 30 3 1 1F 3 1 3 1 3 1 1F 31 3 2 20 3 2 3 2 3 2 20 32 3 3 21 3 3 3 3 3 3 21 33 22 34 3 4 22 3 4 3 4 3 4 22 34 3 5 23 3 5 3 5 3 5 23 35 3 6 24 3 6 3 6 3 6 24 36 3 7 25 3 7 3 7 3 7 25 37 3 8 26 3 8 3 8 3 8 26 38 27 39 3 9 27 3 9 3 9 3 9 27 39 28 40 4 0 28 4 0 4 0 4 0 ...

Page 126: ...ensing temperature sensor F36 F36 5 9 40 Liquid pipe sensor failure Circuit E F33 F33 6 0 41 Toci temperature sensor failure F38 F38 6 1 42 42 High Pressure switch open F39 F39 6 2 43 43 Low Pressure switch open F40 F40 6 3 44 44 System high pressure protection Overcharged high condensing temperature or malfunction of fan motor F41 F41 6 4 45 45 System low pressure protection Undercharged low defr...

Page 127: ... 35 53 5 4 36 5 4 5 4 5 4 36 54 5 5 37 5 5 5 5 5 5 37 55 5 6 38 5 6 5 6 5 6 38 56 39 57 5 7 39 5 7 5 7 5 7 39 57 5 8 3A 5 8 5 8 5 8 3A 58 5 9 3B 5 9 5 9 5 9 3B 59 6 0 3C 6 0 6 0 6 0 3C 60 6 1 3D 6 1 6 1 6 1 3D 61 6 2 3E 6 2 6 2 6 2 3E 62 6 3 3F 6 3 6 3 6 3 3F 63 6 4 40 6 4 6 4 6 4 40 64 6 5 41 6 5 6 5 6 5 41 65 42 66 0 1 01 0 1 0 1 0 1 01 01 0 2 02 0 2 0 2 0 2 02 02 0 4 04 0 4 0 4 0 4 04 04 0 7 07...

Page 128: ... the calibration of the sensors The measured resistance must be within the tolerances located in the tables There are 16 potential Error Codes that can be generated by the PCB to indicate a failure of an outdoor unit temperature sensor When the system generates an error code it will be displayed on the Service Monitor Board the number of flashes on the PCB and also on the indoor unit display panel...

Page 129: ...g Mode Overcharge Undersized refrigerant lines or excessive length Restriction Note If the refrigerant pressures are correct yet the system does not close the error reporting pressure switch replace the defective pressure switch Low Low Pressure Pressure Switch Switch High Pres High Pres sure sure Switch Switch Error Code 45 This code is indicating that system pressure is too low Typical Causes of...

Page 130: ...B Check the wiring and the connections CN9 on the PCB and CN15 on the IPM If the connections are good yet the boards do not communicate and the code will not clear check for correct voltage at the IPM CN15 connection If the communication voltage is correct and the high voltage input is present replace the IPM If the communication voltage is not correct replace the PCB Error Code 5 The IPM is prote...

Page 131: ... Possible Causes Overcharge Dirty outdoor coil Hot conditioned space temperature or high load Refrigeration circuit restriction Seized compressor Defective IPM Error Codes Related to Compressor Outdoor Fan 4 Way Valve Error Code 9 This code indicates the outdoor fan motor is not running The fault is detected very quickly by the PCB The system will shut off and display this error code If this error...

Page 132: ...e causes EEPROM is bad Loose EEPROM wiring Correct the wiring Is electric box wiring correct and is compressor wiring firmly connected Is compressor normal compressor coil resistor insulation Is power module normal Replace compressor Replace power module Yes Yes Yes No No No Solve or correct any failures according to relative information 2 Outdoor IPM over current or short circuit 3U24EH2VHA Input...

Page 133: ...ce No The filter board is broken replace the filter board No 4 Communication abnormal between PCB and IPM Control board can not communicate with the compressor driver module for over 4 minutes Possible causes The communication wire is bad The PCB is bad The power module is bad Correct power supply Is power supply voltage normal Is electric box wiring correct Is power module voltage between termina...

Page 134: ...ure over 115 C Error clears within 3 minutes if temperature lowers below 115 C Error status lock if it occurs 3 times in 1 hour Possible causes The sensor is bad or fixed bad The system is clogged The system lack of refrigerant The valve opening is wrong Replace wire and test again Are the fan motor wires conductive Is the motor running Power off and rotate the fan motor by hand Does it turn freel...

Page 135: ...The temperature acquired by PCB is not accurate Replace wire Is the communication wire is shorted Is the communication wire CN21 is disconnected Reconnect Reconnect Yes No No Yes Is the wiring connection sequence correct according to the wiring diagram No Measure the outdoor terminal block voltage between communication 3 and N and measure the indoor terminal block between communication 3 and N to ...

Page 136: ...in the 4 way valve No Replace 4 way valve Yes No Adjust the valve opening Yes Is the electronic expansion valve over throttled 17 4 way valve reversing failure Indoor pipe indoor ambient temperature Tm Tai 5 C 10 minutes after compressor started Error status locks if it occurs 3 times in 1 hour Possible causes The 4 way valve is bad The PCB is bad The 4 way valve coil connection is bad The system ...

Page 137: ...pressor correct Is power module is normal Correct the wiring according to diagram Replace power module Yes Yes No No Compressor load too high find the reason Yes Is compressor is normal compressor coil resistor insulation No Replace compressor No 24 Compressor startup failure Compressor start failure has been detected by driver module Possible causes The power supply is abnormal Incorrect compress...

Page 138: ...Power off Is pressure switch wiring connection ok Use multimeter to check the high pressure switch Is the switch short circuited Is the EEV coil wiring correct and firmly in place Is the stop valve is open Use a multimeter to check the resistance of Tc Tm Are they withing range Is the piping system clogged Is the connection pipe bent The pressure is bad replace it Open the stop valve Clean the pip...

Page 139: ...sensor detection value is incorrect Refrigerant overcharge Blocked liquid line piping The outdoor unit cannot be turned on normally due to failure to open outdoor heat exchanger electronic expansion valve when heating The operation environment is beyond the allowed range Power on Short the low pressure switch terminal on the PCB Does the system report a failure Is the fan motor ok Is the resistanc...

Page 140: ...www haierductless com GE Appliances A Haier Company Appliance Park Louisville KY 40225 2020 GE Appliances A Haier Company Issued Date X X 2020 ...

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