Page 1 Ductless Multi-Split Heat Pump Outdoor Indoor 2U18MS2VHB Wall Mount - Highwall 3U24MS2VHB AW07EH2VHA 4U36MS2VHB AW09EH2VHA Service Manual 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...
Page 2 Revision History Aug. 2020 - Manual release.
Page 3: Table Of Contents
INTRODUCTION Table of Contents Safety & Precautions................................A-2 Specifications ..................................A-3 Outdoor Units ..................................A-3 Highwall Indoor ................................... A-4 Ducted Indoor ..................................A-4 Cassette Indoor .................................. A-5 Console Indoor ..................................A-5 Mid-Static Ducted Indoor ..............................A-5 Functions and Control ................................A-6 Auto Mode ....................................
Page 4: Safety & Precautions
Safety & Precautions Topic Title • Read these Safety Precautions carefully to ensure correct installation. • This manual classifies the precautions by WARNING and CAUTION. • Follow all precautions below. They are all important for ensuring safety and preventing property/equipment damage. WARNING: Failure to follow any of WARNING is likely to result in grave consequences such as death or serious injury. CAUTION: Failure to follow any of CAUTION may, in some cases, result in grave consequences.
Page 5: Specifications
Specifications Topic Title Outdoor Units Compressor Type: 2 Zones 3 Zones 4 Zones DC Inverter Driven Rotary Voltage/Cycle/Phase: 208-230/60/1 Operating Range ( Cooling Heating Outdoor Units 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB Rated Capacity Btu/hr 17,400 22,600 34,000 Capacity Range Btu/hr 4,400-19,400 5,000-24,500 5,000-36,000 Cooling Non- ducted...
Page 6: Highwall Indoor
Specifications Topic Title Highwall Indoor AW07EH2VHA AW09EH2VHA AW12EH2VHA AW18EH2VHA Rated Cooling Capacity Btu/hr 7,000 9,000 12,000 19,000 Rated Heating Capacity Btu/hr 10,000 12,000 16,500 20,400 Voltage, Cycle, Phase V/Hz/- 208-230/60/1 208-230/60/1 208-230/60/1 208-230/60/1 Airflow CFM 420/360/300/240/180 470/410/350/290/230 440/410/380/311/260 710/650/560/440/410 (Turbo/H/M/L/Quiet) Indoor Sound dB...
Page 7: Cassette Indoor
Specifications Topic Title Cassette Indoor AB09SC2VH(-) AB12SC2VH(-) AB18SC2VH(-) AL24LP2VH(-) Rated Cooling Capacity Btu/hr 9,000 12,000 18,000 24200 Rated Heating Capacity Btu/hr 10,000 13,000 19,000 27300 Voltage, Cycle, Phase V/Hz/- 208-230/60/1 208-230/60/1 208-230/60/1 208-230/60/1 Airflow CFM 410/365/305/265/205 410/365/305/265/205 470/410/365/295/252 740/630/480/400 (Turbo/H/M/L/Quiet) Indoor Sound dB 42/40/36/32/25 42/40/36/32/25 45/42/40/36/32...
Page 8: Functions And Control
Functions and Control Auto Mode Dry Mode (Dehumidifying Mode) When the running mode is turned to auto after starting the • Temperature control range: 60-86°F system, the system will first determine the running mode • Temperature difference: ±2°F according to the current room temperature and then will Control feature: Send the dehumidifying signal to the outdoor run according to the determined mode: Tr means room system.
Page 9: Heat Mode
Functions and Control Heat Mode • Residue heat sending. The indoor fan will send the residue heat at a low speed for 12 seconds. • Temperature control range: 60-86°F • If other conditions are satisfied, when the compressor stops, • Temperature difference: ±2°F the indoor system will operate at a light speed. The indoor Control feature: the temperature compensation is fan will stop when the coil temperature is below the heat automatically added and the system will send the heating...
Page 10: Abnormality Confirmation Approaches
Functions and Control Abnormality Confirmation Approaches The Outdoor Fan Control When In Cooling or Dehumidifying Mode 1. Indoor temperature sensor abnormality: Under the operation, the normal temperature ranges from Five seconds after compressor starts, the outdoor fan will 120°F to -30°F. When the temperature goes beyond this start running at medium speed.
Page 11: Over-Temperature Heat Mode Indoor Coil
Functions and Control Over-Temperature Heat Mode Indoor Coil The over-temperature routine will protect the system from excessive high indoor coil temperature during heat mode operation. The routine will initiate if the indoor coil temperature 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.
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Page 13 OUTDOOR TECHNICAL OVERVIEW 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB Table of Contents Components ..................................B-2 Service Monitor Board (SMB) .............................. B-2 Module Circuit Board (MCB) ..............................B-2 Electronic Control Unit Circuit Board (ECU) ........................B-3 Power Circuit Board (PCB) ..............................B-4 Outdoor Fan Motor ................................B-5 Low Pressure Switch................................
Page 14: Components
Components Topic Title The outdoor unit features a variable speed rotary type compressor that delivers refrigerant flow to up to 4 individual indoor units. The system uses R-410A refrigerant mixed with PVE oil. The system is rated to operate at 208/230 volts single phase 60 Hz power.
Page 15: Electronic Control Unit Circuit Board (Ecu
Components Topic Title Electronic Control Unit Circuit Board (ECU) The Electronic Control Unit operates the outdoor fan motor, crankcase heater, EEV stepper motors and the 4-way valve. This board also controls the general operation of the system and makes all of the diagnostic decisions.
Page 16: Power Circuit Board (Pcb
Components Power Circuit Board (PCB) The purpose of the Power Circuit Board is to filter out potential electrical noise before it reaches the outdoor unit electronic circuits. All voltage to operate the outdoor unit circuits must pass through the PCB. 1.
Page 17: Outdoor Fan Motor
Components Outdoor Fan Motor 4 Way Valve The 4 Way Valve is energized during heating mode operation. The Outdoor Fan Motor is a variable speed motor. The motor The valve is energized with 230 volts via a connection plug on is energized via a connection plug on the ECU.
Page 18: Compressor
Components Compressor example, in cooling mode, at outdoor air temperature above 68°F, the starting position of the valve will be 250 pulses. If the Outdoor Air Temperature is lower than 68°F, the valve will be opened to a position equal to 210 pulses. The actual starting position of the valve is not something a service technician can use to aid in solving a diagnostic problem.
Page 19: Temperature Sensors
Components Temperature 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.
Page 20: Operations
Operations The outdoor unit is capable of controlling up to 4 individual indoor units. The outdoor unit will vary compressor capacity and outdoor fan motor speed to match the demand requirement from the indoor units. All capacity and diagnostic decisions are controlled by the outdoor unit ECU.
Page 21 Operations Temperature Sensor Td Temperature Sensor Tc1 The temperature of the compressor discharge hot gas will The EEV Gas Pipe Sensor will monitor the temperature of the be monitored by the Discharge Temperature Sensor. If the suction gas to calculate the difference between Liquid Pipe sensor reads too hot or cool, the frequency/status of the Temperature and Gas Pipe Temperature.
Page 22: Heating Mode Sequence Of Operation
Operations Heating Mode Sequence of Operation Low pressure Suction temp. switch 4-way valve coil: sensor Comp- Refrigerant flow in cooling ressor Refrigerant flow in heating Discharge temp. sensor Accumulator separator Capillary tube Unit A gas pipe temp. sensor Indoor unit A High pressure switch Unit B gas pipe temp.
Page 23 Operations Temperature Sensor Te Temperature Sensor Td The outdoor coil temperature will be sensed by the Defrost The temperature of the compressor discharge hot gas will Sensor. The sensor will use this temperature to maintain be monitored by the Discharge Temperature Sensor. If the EEV position/superheat adjustment and to calculate when a sensor reads too hot or cool, the frequency/status of the defrost cycle is necessary.
Page 24: Outdoor Frequency Control
Operations Outdoor Frequency Control Crankcase Heater Control A. The compressor running frequency is range is 20-95 RPS. The crankcase heater is controlled by the ECU. The heater keeps the compressor oil warm to prevent liquid refrigerant from migrating to the oil during periods where the system is Electronic Expansion Valve (EEV) Control not running.
Page 25: Initiating Forced Defrost Operation
Operations Initiating Forced Defrost Operation Frequency Control when there is CT Over-current Protection The system can be placed into a forced defrost cycle from the 10.2.8. wired controller. The system will remain in defrost until sensor Stop immediately, if abnormal stop 3 times in 1 hour, the Te has sensed 53.6°F for at least 1 minute or until the defrost unit will stop and alarm.
Page 26: Forced Defrost Operation
Operations Forced Defrost Operation During compressor start-up, if the AC current is greater than 9A, the frequency of the compressor increases at the There are times when the switch is not active. The periods of prohibited speed. inactive switch operation are: During compressor start-up, if the AC current is greater than 1.
Page 27: Testing
Topic Title Testing Outdoor Fan Motor Check that the wiring and plug connections are in good condition. If the outdoor unit fan motor does not run, or the Service Monitor Board indicates an error code of 09, check the following voltages at the motor connector on the outdoor unit PCB. Set the meter to read DC volts with a minimum voltage range of 350 volts.
Page 28: 4-Way Valve
Topic Title Testing 4-Way Valve The 4-way valve will control the direction of hot gas discharge via an internal slide assembly. The valve has a line voltage solenoid that is energized in heat mode. The solenoid will direct the internal slide to send the hot gas to the indoor coil.
Page 29: Variable Speed Compressor
Testing Variable Speed Compressor 1. Begin by turning off power at the equipment disconnect switch. Adequate time must be given for capacitors on the circuit board to discharge. Wait a minimum of 12 minutes before handling the circuitry. 2. Locate the Inverter control module (IPM). The IPM is connected to the main circuit board by a wire harnesses, and has the compressor connections mounted on it.
Page 30: Wiring Diagrams
Wiring Diagrams 2U18MS2VHB B-18 OUTDOOR TECHNICAL OVERVIEW...
Page 31 Wiring Diagrams 3U24MS2VHB B-19 OUTDOOR TECHNICAL OVERVIEW...
Page 32 Wiring Diagrams 4U36MS2VHB B-20 OUTDOOR TECHNICAL OVERVIEW...
Page 33: Dip Switch Settings
DIP Switch Settings SW5 DIP Switch Settings (3U24MS2VHB, 4U36MS2VHB) Description SW5-1 SW5-2 SW5-3 SW5-4 SW5-5 SW5-6 SW5-7 SW5-8 Cooling Only ---- ---- ---- ---- ---- ---- ---- Heat Pump OFF* ---- ---- ---- ---- ---- ---- ---- Set On For Colder Climates ---- ---- ----...
Page 34 DIP Switch Settings SW6 DIP Switch Settings Outdoor central control address settings Outdoor Central SW6-1 SW6-2 SW6-3 SW6-4 Control Address Master Indoor Unit Slave 1 Slave 2 Slave 3 Slave 4 Slave 5 Slave 6 Slave 7 Slave 8 Slave 9 Slave 10 Slave 11 Slave 12...
Page 35: Error Codes
Error Codes LED Error Diagnosis Code Outdoor EEPROM failure IPM overcurrent or short circuit Communication failure between the IPM and outdoor PCB Module operated overload (compressor overload protection) Module low or high voltage Overheat protection for discharge temperature Malfunction of the DC fan motor Malfunction of defrost temperature sensor Precautions For Adding Refrigerant Suction temperature sensor failure...
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Page 37 WALL MOUNT TECHNICAL OVERVIEW AW07LC2VHB AW09LC2VHB AW12LC2VHB AW18LC2VHB AW24LP2VHA Table of Contents Components ..................................C-2 Component Overview ................................. Indoor Wall Mount Unit Circuit Board ..........................Testing ....................................C-5 Accessing Components/Removing Cover ......................... Indoor Fan Motor Voltage Check ............................Replacing the Blower Motor ..............................Testing Temperature Sensors .............................
Page 38: Components
Components The wall mounted units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have gravity condensate drain systems. If a condensate pump is needed, it must be field provided and mounted external to the indoor unit.
Page 39: Indoor Wall Mount Unit Circuit Board
Components Display The indoor unit has a display that communicates system mode, room temperature and diagnostic code information. The diagnostic code information shown on the indoor unit will NOT be the same code that is displayed on the outdoor unit. When servicing a diagnostic error, compare the indoor unit code to the outdoor unit code to make diagnostic decisions.
Page 40 Components Topic Title Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections.
Page 41: Testing
Testing Accessing Components/Removing Cover 1. To access components for service, first disconnect power 6. Open the 3 caps that cover the screws located behind the to the outdoor unit. This will de-energize the indoor unit. bottom of the louver. These caps flip up. 2.
Page 42: Indoor Fan Motor Voltage Check
Testing Indoor Fan Motor Voltage Check +310 VDC Black If The Indoor Fan Motor Does Not Run: DC Ground White 1. Remove the front cover and access the circuit board fan motor +15 VDC DC Motor Yellow connection. Signal Blue 2.
Page 43 Testing 6. Remove 6 screws that hold the motor bracket and 9. Unplug the motor from the circuit board. evaporator coil. 7. Lift the evaporator coil and remove the motor bracket. 10. Lift and slide the motor away from the blower wheel. 11.
Page 44: Testing Temperature Sensors
Testing Testing Temperature Sensors 3. Identify on the schematic drawing the inoperable louver motor and disconnect the plug from the circuit board. (The The easiest problems to solve will involve codes that are up down louver motor is located on the right side of the related to potential failure of temperature sensors.
Page 45: Wiring Diagram
Wiring Diagrams Topic Title WALL MOUNT TECHNICAL OVERVIEW...
Page 46: Error Codes
Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Outdoor Diagnosis...
Page 47 COMPACT CASSETTE TECHNICAL OVERVIEW AB09SC2VHA AB12SC2VHA AB18SC2VHA Table of Contents Components ..................................D-2 Component Overview .................................D-2 Cassette Unit Indoor Circuit Board .............................D-4 Testing ....................................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...
Page 48: Components
Components The indoor cassette type units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit.
Page 49 Components Topic Title The Blower Assembly The blower assembly consists of a plastic blower wheel that is connected to a PSC indoor blower motor. A set screw holds the blower wheel to the blower motor. The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board. The wiring from the motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds.
Page 50: Cassette Unit Indoor Circuit Board
Components Topic Title Cassette Unit Indoor Circuit Board N Terminal CN19 Float Switch CN6 Fan Motor L Terminal CN21 Louver Panel CN9 Condensate Pump Communication Terminal CN11 Wired Remote CN4 U-HOME 3.15A 250V Fuse DIP Switches CN13 Remote Central CN3 Pipe/Room Temp Sensors CN35 Stepper Motor CN1 Room Card The indoor unit circuit board controls the switching functions...
Page 51: Testing
Testing Accessing the Blower Motor and Condensate Pump Removing Fan Motor 1. Disconnect power to the outdoor unit. 1. Remove holding nut from fan blade. 2. Remove the louver assembly. 2. Fan blade will slide off motor shaft. 3. Remove Phillips head screw holding cover plate over motor wiring leads.
Page 52: Indoor Fan Motor Test Procedure
Testing Indoor Fan Motor Test Procedure If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the circuit board connection. 3. Reset power and turn the remote control fan command to Fan On mode. Motor Test: 1.
Page 53: Testing Louver Motors
Testing Testing Louver Motors 4. Use an Ohmmeter to test the electrical continuity of the If the louver does not operate with command from the remote louver motor windings. The proper resistance for each control, either the indoor board is bad, or the louver motor winding can be found in this table.
Page 54: Test Condensate Pump And Associated Float Switch
Testing Test Condensate Pump and Associated Float Switch If the 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.
Page 55: Wiring Diagram & Dip Switch Settings
2014.11.29 Wiring Diagram & DIP Switch Settings 0150515406 FLOAT ROOM DC FAN PIPING SWITCH TEMP. TEMP. ROOMCARD PANNEL SENSOR SENSOR PUMP CN21 CN19 87654321 87654321 FUSE CN11 T5A/250VAC CN16 CN35 CN13 REMOTE U-HOME CENTRAL UP/DOWN BM1-2 BM1-3 BTU BM1-1 TO OUT DOOR AB09SC2VHA/AB09CS2ERA 9000 AB12SC2VHA/AB12CS2ERA(S)
Page 56: Error Codes
Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Indoor Outdoor...
Page 57 LARGE CASSETTE TECHNICAL OVERVIEW AL24LP2VHA Table of Contents Components ..................................E-2 Component Overview ................................E-2 Cassette Unit Indoor Circuit 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...
Page 58: Components
Components The indoor cassette type units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit.
Page 59 Components The Blower Assembly The blower assembly consists of a plastic blower wheel that is connected to a PSC indoor blower motor. A set screw holds the blower wheel to the blower motor. The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board. The wiring from the motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds.
Page 60: Cassette Unit Indoor Circuit Board
Components Cassette Unit Indoor Circuit Board Power CN19 Float Switch CN6 Fan Motor Communication Terminal CN11 Wired Remote CN9 Condensate Pump 3.15A 250V Fuse DIP Switches CN14 Panel Connection CN3 Pipe/Room Temp Sensors CN36 Stepper Motor The indoor unit circuit board controls the switching functions of The control board has a replaceable 3.15A 250V fuse that the indoor unit.
Page 61: Testing
Testing Accessing the Blower Motor and Condensate Pump Removing Fan Motor 1. Disconnect power to the outdoor unit. 1. Remove holding nut from fan blade. 2. Remove the louver assembly. 2. Fan blade will slide off motor shaft. 3. Disconnect the main power wire to the indoor unit. 3.
Page 62: Indoor Fan Motor Test Procedure
Testing Indoor Fan Motor Test Procedure If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the circuit board fan motor connection. 3. Reset power and turn the remote control fan command to Fan On mode. Motor Test: 1.
Page 63: Testing Louver Motors
Testing Testing Louver Motors 4. Use an Ohmmeter to test the electrical continuity of the If the louver does not operate with command from the remote louver motor windings. The proper resistance for each control, either the indoor board is bad, or the louver motor winding can be found in this table.
Page 64: Test Condensate Pump And Float Switch
Testing Test Condensate Pump and Float Switch If the 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.
Page 65: Wiring Diagram
Wiring Diagram 0150516956U DC FAN MOTOR PIPING ROOM CARD FRESH AIR MOTOR / TEMP FLOAT ROOM SENSOR EXTERNAL ALARM OUTPUT SWITCH TEMP (FUNCTION IN FUTURE ) SENSOR ( Contact rating_230VAC,3A) CN10 DRAIN WIRED PUMP CONTROLLER CN19 CN11 ELECTRIC HEATING TERMINAL RATING_230VAC,3A 87654321 87654321...
Page 66 DIP Switch Settings Topic Title BM1 DIP Switch Settings Capacity Room Card Running Mode Unit Type Description SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 Capacity: 24kBTU(7.1kW) Capacity: 30kBTU(9.0kW) Capacity: 35kBTU(10.5kW) Capacity: 42kBTU(12.5kW) Capacity: 48kBTU(14.0kW_ Room card invalid(default) Room card valid Heat pump(default) Cooling only High performance cassette...
Page 67 Error Codes Topic Title The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Indoor Panel...
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Page 69 SLIM DUCT TECHNICAL OVERVIEW AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB Table of Contents Components ..................................F-2 Component Overview ................................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 &...
Page 70: Components
Components The Slim Duct Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air These units have a built in condensate pump with an associated condensate level switch.
Page 71: Indoor Unit Circuit Board
Components Condensate Pump The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette. The float switch connects onto the circuit board. 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.
Page 72 Components The Indoor Unit Circuit Board communicates with the outdoor unit ECU Outdoor unit via a connection at Terminal Block screw 3. The data pulse that sends the Indoor uni t communication information can be measured with a voltmeter placed to DCV range.
Page 73: Ductwork/Grilles
Ductwork / Grilles Topic Title Basic Duct Configurations Here are the typical duct configurations that can be used with the unit. Ductwork Installation Roof Installation Roof Return air box Air outlet grill Ceiling Air supply Unit Return air box Unit Return air Air supply Return air...
Page 74: Testing
Topic Title Testing Test Condensate Pump and Float Switch 3. The pump should start. 4. If the pump does not start, check for voltage at the control The unit has a built-in condensate pump and water level board pump connection. There should be 230 Volts AC to safety switch.
Page 75: Testing Temperature Sensors
Topic Title Testing Testing Temperature Sensors Indoor Fan Motor Voltage Check The easiest problems to solve will involve codes that are If The Indoor Fan Motor Does Not Run: related to potential failure of temperature sensors. Common 1. Remove the front cover and access the fan motor circuit problems may include loose connections, open electrically, board connection.
Page 76 Wiring Diagrams & DIP Switch Settings Topic Title ROOM FLOAT 0150515412 SWITCH TEMP. PIPING TEMP. SENSOR REMOTE SENSOR U-HOME CENTRAL PANNEL CONTROLLER ROOMCARD CN13 CN36 CN18 CN19 REMOTE RECEIVER T5A/250VAC FUSE CN22 87654321 4321 NOTE: CN23 LEFT/RIGHT 1.DASHED PARTS ARE SWING MOTOR OPTIONAL.
Page 77 Error Codes Topic Title The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Indoor Outdoor...
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Page 79 MID-STATIC DUCTED TECHNICAL OVERVIEW USYM09UCDSA USYM12UCDSA USYM18UCDSA USYM24UCDSA Table of Contents Components ..................................G-2 Component Overview .................................G-2 Indoor Unit Circuit Board ..............................G-4 Fresh Air Function ................................G-5 Ductwork/Grilles .................................. 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...
Page 80 Components Components The Mid-Static Ducted Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection flanges.
Page 81 Components Components Control Board Located under the electrical control box cover. 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. Piping Temperature Sensor The Piping Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode.
Page 82 Components 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. CN17-GEA3 wifi module socket CN6-DC fan motor socket CN10-Fresh air link/E.A.O socket...
Page 83 Components Topic Title Fresh Air Function In Heating mode When there is fresh air signal received by the Indoor Unit PCB (the fresh air signal can be sent by infrared remote controller The fresh air output will maintain a 20 minutes ON, 20 minutes or wired controller), the Normal fresh air function is valid.
Page 84 Ductwork / Grilles Basic Duct Configurations Here are the typical duct configurations that can be used with the unit. Ductwork Installation Roof Installation Roof Return air box Air outlet grill Ceiling Air supply Unit Return air box Unit Return air Air supply Return air Long Duct...
Page 85 Testing Test Condensate Pump and Associated Float Switch Testing Temperature Sensors If the internal condensate pump does not operate, the pump The easiest problems to solve will involve codes that are may be bad or the float switch may be defective. Perform the related to potential failure of temperature sensors.
Page 86 Testing Testing Communication Circuit Indoor Fan Motor Voltage Check If an Error E7 occurs, perform the following test to determine If The Indoor Fan Motor Does Not Run: if the indoor control board is functioning properly to send data 1. Remove the front cover and access the fan motor circuit to the outdoor unit.
Page 87 Testing Static Pressure Charts AM09SL2VHA air flow and static pressure chart USYM09UCDSA AM09SL2VHA air flow and static pressure chart High(cfm) Med(cfm) High(cfm) Low(cfm) Med(cfm) Quiet(cfm) Low(cfm) Quiet(cfm) 0.15 0.28 0.36 0.44 0.48 0.52 Static pressure (in.wc.) 0.15 0.28 0.36 0.44 0.48 0.52 Static pressure (in.wc.)
Page 88 Topic Title Testing Board Replacement 3. Remove the 4 screws holding the pump in place. 1. Remove the ambient sensor. 4. Tilt the pump out from the top and pull out 2. Unplug all connectors from the board. 3. Remove the 2 board mounting screws and remove the board.
Page 89 Topic Title Testing 3. Feed motor wires into the air inlet box 8. Support the motor (2 people may be required at this time). Loosen the 2 screws of the motor mount bracket and 4. Remove the air box cover. remove full assembly 9.
Page 90 Wiring Diagram Topic Title INFRARED SIGNAL RECEIVER DC FAN MOTOR YCJ-A002 Indoor un REMOTE CENTRAL RELAY FOR AUXILIARY CONTROL (dry contact port,contact ADAPTOR rating 230VAC,3A Wire Flash times of the CN21 indoor unit PCBA erro LED3 LED4 WiFi MODULE LED4 TO RJ 45 device LED3 ROOM CARD...
Page 91: Dip Switch Settings
DIP Switch Settings SW1 DIP Switch Settings Description SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 Capacity: 9000btu/h Capacity: 12000btu/h Capacity: 18000btu/h Capacity: 24000btu/h Room card invalid OFF* Room card valid Heat pump OFF* Cooling only Fresh air valid OFF* External alarm output Without filter clean warning OFF*...
Page 92: Error Codes
Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Indoor Outdoor...
Page 93 MEDIUM STATIC DUCTED (PRO SERIES) TECHNICAL OVERVIEW AM24LP2VHA Table of 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 ..................................
Page 94: Components
Components The Medium Static Ducted Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection flanges.
Page 95: Indoor Unit Circuit Board
Components Piping Temperature Sensor The Piping 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 temperature information to the ECU that may be used in frequency adjustments.
Page 96 Components The Indoor Unit Circuit Board communicates with the outdoor unit ECU Outdoor unit via a connection at Terminal Block screw 3. The data pulse that sends the Indoor uni t communication information can be measured with a voltmeter placed to DCV range.
Page 97: Ductwork/Grilles
Ductwork / Grilles Topic Title Basic Duct Configurations Here are the typical duct configurations that can be used with the unit. Ductwork Installation Roof Installation Roof Return air box Air outlet grill Ceiling Air supply Unit Return air box Unit Return air Air supply Return air...
Page 98: Test Condensate Pump And Associated Float Switch
Topic Title Testing Test Condensate Pump and Float Switch 3. The pump should start. 4. IIf the pump does not start, check for voltage at the pump The unit has a built-in condensate pump and water level control board connection. There should be 230 Volts AC safety switch.
Page 99: Testing Temperature Sensors
Topic Title Testing Testing Temperature Sensors Indoor Fan Motor Voltage Check The easiest problems to solve will involve codes that are If The Indoor Fan Motor Does Not Run: related to potential failure of temperature sensors. Common 1. Remove the front cover and access the fan motor circuit problems may include loose connections, open electrically, board connection.
Page 100: Wiring Diagram
Wiring Diagram Topic Title MEDIUM STATIC DUCTED (PRO SERIES) TECHNICAL OVERVIEW...
Page 101: Dip Switch Settings
DIP Switch Settings Description SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 AM24LP2VHA Room card invalid(default) Room card valid Cool and heat(default) Cool only External alarm output(default) Fresh air Without filter clean remind (default) With filter clean remind ESP DUCT ( USA) EU.
Page 102: Error Codes
Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Indoor Outdoor...
Page 103 CONSOLE TECHNICAL OVERVIEW USYF09UCDWA USYF12UCDWA USYF18UCDWA Table of Contents Components ...................................I-2 Component Overview ................................I-2 Indoor Circuit Board................................I-3 Testing ....................................I-4 Removing the Filter Cover & Filter ............................I-4 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...
Page 104: Components
Components The indoor console unit functions as an evaporator coil during cooling mode, and as a condensing coil during heat mode. Condensate is collected by a drain pan below the coil and condensate is drained directly to the outdoor or to a secondary condensate pump via the provided condensate drain line Console units may be operated with either a wired remote control or the wireless remote control provided with the unit.
Page 105: Indoor Circuit Board
Components Indoor Circuit Board SW2-Damper switch CN31- Display CN35- Lower damper motor CN3-Temperature sensor socket (Tr: ROOM SENSOR, Tp:PIPE SENSOR) CN6-DC fan motor CN17-WiFi module Power supply RJ45 adapter board CN20-Diagnostic port CN22- Optional wired controller The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU.
Page 106: Removing The Filter Cover & Filter
Topic Title Testing Removing the Filter Cover & Filter 3. Unplug the three connectors for the fan motor, upper louver and bottom damper. 1. Slide the side latches up to unlock the cover and pull forward about an inch then lift up. 4.
Page 107: Upper Louver Removal
Topic Title Testing Replace Fan Motor 3. Take note of connection location and carefully remove each connector. 1. Remove filter cover, front panel, control box, upper louver 4. Remove the 2 screws mounting the board in the box. They and bottom damper. in diagonal corners from each other.
Page 108 Topic Title Testing Indoor Fan Motor Test Procedure 5. Remove the four screws holding on the fan inlet faring. If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the fan motor circuit board connection.
Page 109 Topic Title Testing Testing Temperature Sensors Testing Louver Motors The easiest problems to solve will involve codes that are If the louver does not operate with command from the remote related to potential failure of temperature sensors. Common control, either the indoor board is bad, or the louver motor problems may include loose connections, open electrically, is defective.
Page 110 Topic Title Testing 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 unit powered and all wiring connected between indoor and outdoor unit.
Page 111 Wiring Diagram/DIP Switch Settings Panel Wire display disp CN16 CN17 CN31 CN16-1 Swing motor for lower louver CN22(22-1) Swing motor Main control board for upper louver L2 L1 CN10 Note: To RJ45 DEVICE To Outdoor Unit DIP switches factory default setting Note：...
Page 112 Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ. Indoor Outdoor Diagnosis...
Page 113 TROUBLESHOOTING & REFERENCES Table of Contents Special Functions ...................................J-3 Auto Restart ..................................J-3 Forced Defrost ..................................J-3 Indoor Temperature Display (Highwall Only) ........................J-3 Enhanced Defrost .................................J-3 Temperature Compensation ..............................J-4 Matching Tables ..................................J-6 Resistance Chart / Sensor Definitions ............................J-7 Resistance Values ..................................J-8 Louver Motors ..................................J-8 EEV ......................................J-8 Component Ratings ................................J-9 4-Way Valve ..................................J-9...
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Page 115: Auto Restart
Special Functions Topic Title Auto Restart When this is enabled, the following functions will automatically resumes after a power loss: • ON/OFF State, Mode of Operation, Fan Speed, Temperature Setpoint, Louver Swing settings. • If there was a timer set or the system was in Sleep mode, they will be canceled upon restart. Wired Controller: •...
Page 116: Temperature Compensation
Slim Duct AD12SL2VH* 0151800175A WJ26X23178 YR-HBS01 RE-02(CN29) Unplug Chart 2 Slim Duct AD18SL2VH* 0151800175A WJ26X23178 YR-HBS01 RE-02(CN29) Unplug Chart 2 Highwall AW07EH2VHA A0011001066 WJ26X25213 YR-HG Chart 4 Highwall AW09EH2VHA A0011001066 WJ26X25213 YR-HG Chart 4 Highwall AW12EH2VHA A0011001066 WJ26X25213 YR-HG Chart 4...
Page 117 Special Functions Guide 2 1. Remove power to the unit and unplug the wired controller from the indoor unit PCB. 2. Connect the infrared remote signal receiver to indoor unit PCB. 0151800106E = socket CN29 0151800267 = socket CN21 3. Apply power to the unit. 4.
Page 118 Matching Tables Topic Title 2U18MS2VHB / 2U20EH2VHA 4U36MS2VHB/ 4U36EH2VHA Combinations Combinations Required Required Total Adapter Port B Port A Total Capacity Port D Port C Port B Port A Adapter Capacity 1/4" x 3/8" 1/4" x 3/8" 1/4" x 1/2" 1/4" x 3/8" 1/4" x 3/8" 1/4" x 3/8" - - - - - - - - -...
Page 119: Resistance Chart / Sensor Definitions
Resistance Chart / Sensor Definitions Topic Title Abbr. Definition Type Abbr. Definition Type Temperature of indoor ambient Temperature of outdoor ambient Temperature of indoor condenser Temperature of outdoor condenser Toci Hot Gas Leaving the 4-Way Valve Temperature of outdoor discharge EEV Liquid Sensor Temperature of outdoor defrost EEV Gas Sensor...
Page 120: Louver Motors
Resistance Values Topic Title Highwall Horizontal Louver Motor Highwall Vertical Louver Motor Orange Yellow Pink Blue Grey Yellow Orange Blue Grey 193 Ω 189.5 Ω 185.4 Ω 191.5 Ω White 92.6 Ω 47 Ω Orange 381.6 Ω 377.4 Ω 383.3 Ω 47 Ω...
Page 121: 4-Way Valve
Component Ratings Topic Title 4-Way Valve Reactor Ohms Ohms 2.1K 208-230 ???? 29.4?? Basepan Heater Ohms 0.28K - 0.379K 208-230 Fan Motors VDC Outputs to DC Fan Motor (VDC) DC Fan Motor Pin Identification PIN # RED Probe Black Probe Value PIN # Color...
Page 122: Refrigeration Diagrams
Refrigeration Diagrams 3U24MS2VHB J-10 TROUBLESHOOTING & REFERENCES...
Page 123 NGLISH Refrigeration Diagrams 4U36MS2VHB J-11 TROUBLESHOOTING & REFERENCES...
Page 124 Master Error Code Chart Topic Title HIGHWALL CONSOLE COMPACT CASSETTE Panel LED Flash or Outdoor Outdoor Outdoor ID PCB LED Flash Pro-Series Multi-Zone Single-Zone Digital Digital FAULT DESCRIPTION LED Display LED Display LED1 Flash Display Display Yellow Timer LED Green Run LED (CAC) (CAC) (RAC)
Page 125: Master Error Code Chart
Master Error Code Chart LARGE CASSETTE DUCTED WIRED CONTROLLER Panel LED Flash or MID-STATIC DUCT HIGH STATIC SLIM DUCT Panel ID PCB LED Flash (MSP) YRE-17A Display YRE-16B QACT17A Yellow Timer LED Green Run LED LED4 LED3 LED4 LED3 (PB*****) LED4 LED3 (PCB LED4)
Page 126 Master Error Code Chart HIGHWALL CONSOLE COMPACT CASSETTE Panel LED Flash or Outdoor Outdoor Outdoor ID PCB LED Flash Pro-Series Multi-Zone Single-Zone Digital Digital FAULT DESCRIPTION LED Display LED Display LED1 Flash Display Display Yellow Timer LED Green Run LED (CAC) (CAC) (RAC)
Page 127 Master Error Code Chart LARGE CASSETTE DUCTED WIRED CONTROLLER Panel LED Flash or MID-STATIC DUCT HIGH STATIC SLIM DUCT Panel ID PCB LED Flash (MSP) YRE-17A Display YRE-16B QACT17A Yellow Timer LED Green Run LED LED4 LED3 LED4 LED3 (PB*****) LED4 LED3 (PCB LED4)
Page 128 Outdoor Unit Error Codes 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. Temperature Sensor Error Codes The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open or shorted, and out of calibration.
Page 129: Outdoor Unit Error Codes
Outdoor Unit Error Codes Pressure-Related Error Codes To protect the compressor, the PCB has a low pressure switch connection at CN13, and a high pressure switch connection at CN12. Pressure Pressure Switch Switch High Pres- High Pres- sure sure Switch Switch Error Code 42 &...
Page 130: Error Codes Caused By Abnormal Refrigerant Circuit Conditions
Outdoor Unit Error Codes Error Codes Caused by Abnormal Refrigerant Circuit Error Code 4 Conditions This code indicates the IPM is not communicating with the PCB. Check the wiring and the connections CN9 on the Error Code 8 PCB and CN15 on the IPM. If the connections are good, yet the boards do not communicate and the code will not clear, This code indicates the temperature of the compressor hot check for correct voltage at the IPM CN15 connection.
Page 131: Error Codes Related To Compressor, Outdoor Fan & 4-Way Valve
Outdoor Unit Error Codes Error Codes Related to Compressor, Outdoor Fan & Error Code 23 4-Way Valve This code indicates an IPM thermal overload. This error was generated by a temperature sensor located in the IPM Error Code 9 heat sink. Causes of overheating are typically overcharge of refrigerant, excessively plugged coil, sensor open or This code indicates the outdoor fan motor is not running.
Page 132: Outdoor Eeprom Malfunction
Flow Charts Topic Title [1] Outdoor EEPROM Malfunction Code disappears after EEPROM communication error; EEPROM data check power off/on again error (model ID, checksum, etc.); EEPROM data logic error (wider data range, wrong order, etc.) Possible causes: Check outdoor • EEPROM is bad PCB, If faulty, replace it.
Page 133: Communication Abnormal Between Pcb And Ipm
Flow Charts Topic Title [4] Communication abnormal between PCB and IPM Control board can not Is the compressor drive module communicate with the input power normal (Test the AC power supply voltage of the compressor driver module for Adjust communication wire module’s power input ACL-ACN: over 4 minutes normal value should between 196-...
Page 134: Replace Fan Motor
Flow Charts Topic Title [8] Discharge temperature too high protection Compressor discharge temperature over 115°C. Error Reconnect Is sensor wiring firmly in place? clears within 3 minutes if temperature lowers below 115°C. Error status lock if it occurs 3 times in 1 hour. Possible causes: •...
Page 135: Outdoor Defrosting Temp. Sensor Te Abnormal
Flow Charts Topic Title [10] Outdoor defrosting temp. sensor Te abnormal [11] Suction temp.sensor Ts abnormal [12] Outdoor ambient temp. sensor Ta abnormal [13] Discharging temp. sensor Td abnormal Is the sensor wiring Replace firmly and correctly in sensor place? Sensor temperature has been detected below or higher than expected, or the sensor has been detected as a shorted or open circuit.
Page 136: Lack Of Refrigerant Or Discharging Pipe Blocked
Flow Charts Topic Title [16] Lack of refrigerant or discharging pipe blocked Discharge & suction temperature Td-Ts≥80°C 10 minutes after compressor start. Error status locks if it occurs 3 times Is the sensor wiring correct Correct wiring in 1 hour. and firmly connected? Possible causes: •...
Page 137: Compressor Motor Desynchronizing
Flow Charts Topic Title [18] Compressor motor desynchronizing Motor desynchronizing occurred. Caused by overload, load Correct power supply Is supply voltage normal? sharply fluctuating, abnormal compressor current sensor circuit, or one of the inverter gate drive signals is missing. Is wire connection Possible causes: Correct the wiring between power module...
Page 138: Open High Pressure Switch
Flow Charts Topic Title [42] Open high pressure switch High pressure switch: Switch circuit has been detected open for Power on 30 seconds (after 3 minute of compressor run time). Error locks if it occurs 3 times in 1 hour. Possible causes: Short the high pressure switch terminal on the PCB.
Page 139: High Pressure Detected In System
Flow Charts Topic Title [44] High pressure detected in system The minimum temperature value of indoor pipe Tm Power off. Is pressure switch and outdoor Ts is lower than -45 °C during cooling Reconnect wiring connection ok? mode, or minimum temperature value of outdoor Tc and outdoor Te is lower than -45 °C.
Page 140 GE Appliances, A Haier Company Appliance Park, Louisville, KY 40225 ©2020 GE Appliances, A Haier Company Issued Date: X/X/2020...

Haier AW07EH2VHA Service Manual

A-1 Introduction

Safety & Precautions

Specifications

Functions and Control

Outdoor Technical Overview 2U18Ms2Vhb 3U24Ms2Vhb 4U36Ms2Vhb

Components

Operations

Testing

Wiring Diagrams

DIP Switch Settings

Error Codes

Wall Mount Technical Overview Aw07Lc2Vhb Aw09Lc2Vhb Aw12Lc2Vhb Aw18Lc2Vhb Aw24Lp2Vha

Compact Cassette Technical Overview Ab09Sc2Vha Ab12Sc2Vha Ab18Sc2Vha

Components

Testing

Wiring Diagram & DIP Switch Settings

Error Codes

Large Cassette Technical Overview Al24Lp2Vha

Components

Testing

Wiring Diagram

Slim Duct Technical Overview Ad07Sl2Vhb Ad09Sl2Vhb Ad12Sl2Vhb Ad18Sl2Vhb

Components

Ductwork/Grilles

Testing

MID-Static Ducted Technical Overview Usym09Ucdsa Usym12Ucdsa Usym18Ucdsa Usym24Ucdsa

DIP Switch Settings

Error Codes

Wiring Diagram & DIP Switch Settings

Am24Lp2Vha

Components

Ductwork/Grilles

Testing

DIP Switch Settings

Wiring Diagram

Error Codes

Console Technical Overview Usyf09Ucdwa Usyf12Ucdwa Usyf18Ucdwa

Troubleshooting & References

Special Functions

Matching Tables

Resistance Chart / Sensor Definitions

Resistance Values

Component Ratings

Refrigeration Diagrams

Master Error Code Chart

Outdoor Unit Error Codes

Flow Charts

Quick Links

Chapters

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Summary of Contents for Haier AW07EH2VHA

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Table of Contents