Page 1 Ductless Multi-Split Heat Pump Outdoor Indoor ASH220NCDWA Wall Mount - Highwall ASH324NCDWA ASYW07URDWA ASH436NCDWA ASYW09URDWA ASYW12URDWA ASYW18URDWA 2’x2’ Compact Cassette Service Manual AB09SC2VHA AB12SC2VHA AB18SC2VHA 3’x3’ Large Cassette AL24LP2VHA Slim Duct AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB Mid-Static Ducted USYM09UCDSA USYM12UCDSA USYM18UCDSA...
Page 2 Revision History Oct. 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
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 ASH220NCDWA ASH324NCDWA ASH436NCDWA Rated Capacity Btu/hr 18,100 22,000 34,000 Capacity Range Btu/hr 7000-20000 6000-23600 6000-38000 Cooling Non-Ducted...
Page 6: Highwall Indoor
Specifications Topic Title Highwall Indoor ASYW07URDWA ASYW09URDWA ASYW12URDWA ASYW18URDWA 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 42/39/37/28/23 42/39/37/28/23 42/39/37/28/23...
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.
Page 12 [This page intentionally left blank.]...
Page 13 OUTDOOR TECHNICAL OVERVIEW ASH220NCDWA ASH324NCDWA ASH436NCDWA Table of Contents Components ..................................B-2 Component Overview ................................. B-2 Service Monitor Board (SMB) .............................. B-3 Inverter Power Module (IPM) ............................... B-3 PCB ....................................... B-4 Power Filter Board (PFB) ..............................B-5 Operations.................................... B-6 Cooling Mode Sequence of Operation ..........................B-6 Heating Mode Sequence of Operation ..........................
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, and is 208/230 VAC, 60 Hz, single phase. Compatible indoor units are High wall, Cassette, Ducted, and Console with remote control, cassette with either remote or wired control, and ducted with wired control only.
Page 15: Service Monitor Board (Smb
Components Topic Title Service Monitor Board (SMB) The SMB has important features including operational DIP switches, error code display, compressor speed, and diagnostic capabilities. The SMB is connected to the PCB via connections CN-2 and CN-3. The SW1 DIP switches are OFF (default position for normal operation). The digital display will indicate operating frequency of the compressor when no error code is present, or will flash an error code if present.
Page 16: Pcb
Components The PCB is connected via communication cables to the Inverter Power Module, Filter Board, and the Service Monitor Board. Voltage to operate the PCB is provided by the Power Filter Board on terminals ACN and ACL. When power is present, the Green LED will light.
Page 17: Power Filter Board (Pfb
Components Power Filter Board (PFB) 2U & 3U The purpose of the PFB 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 PFB. A replaceable, 30A, 250V rated ceramic fuse protects the outdoor unit electronics.
Page 18: Operations
Operations Cooling Mode Sequence of Operation On a call for cooling, the indoor unit will send the room temperature and set-point requirement to the outdoor unit PCB via the data signal wire path. The data travels from the indoor unit to the outdoor unit via the wire located on terminal 3/C. The indoor louvers will open and the indoor fan motor will start.
Page 19 Operations Temperature Sensor Tc1 Temperature Sensor Td The Gas Pipe Sensor will monitor the temperature of the The temperature of the compressor discharge hot gas will be gas pipe to calculate the difference between Liquid Pipe monitored by the Discharge Temperature Sensor. If the sensor Temperature and Gas Pipe Temperature.
Page 20: Heating Mode Sequence Of Operation
Operations Heating Mode Sequence of Operation On a call for heating, the indoor unit will send the room temperature and set-point requirement to the outdoor unit PCB via the data signal wire path. The data travels from the indoor unit to the outdoor unit via the wire located on terminal 3/C. The indoor unit louvers will open.
Page 21 Operations Temperature Sensor Td Temperature Sensor Te The temperature of the compressor discharge hot gas will be The outdoor coil temperature will be sensed by the Defrost monitored by the Discharge Temperature Sensor. If the sensor Sensor. The sensor will use this temperature to to adjust EEV reads too hot or cool, the frequency/status of the operation open angle and to calculate when a defrost cycle is necessary.
Page 22: Defrost Cycle Sequence Of Operation
Operations Defrost Cycle Sequence of Operation Multi: Beginning Fixed frequency Indicated FQY 60s Defrosting FQY 80 Hz （ E） Soft startup Compressor Outdoor motor Send defrosting signal to indoor Auto 4-way valve 450-pulse 450-pulse 350-pulse(E) All EEVs Auto open angle Auto open angle All indoor motors ON Anti- cold air fun ction...
Page 23: Electronic Expansion Valve (Eev) Control
Operations Electronic Expansion Valve (EEV) Control Electronic characteristics Max. open angle 480 pulses Driving speed Open angle limitation of EEV Unit stop Max. open angle Thermostat OFF Min. open angle Cool/ dry 5 pulses 480 pulses 5 pulses 80 pulses Heat 5 pulses 480 pulses...
Page 24: Defrost Control
Operations Defrost Control Base Pan Heater Control Logic In the heating mode and along with the ambient sensor, the When the compressor starts in the heating mode, the defrost sensor monitors the temperature of the outdoor following conditions will apply: coil to determine if defrost is needed.
Page 25: High Current Protection
Operations High Current Protection The below table is the outdoor unit protection current and compressor current. Model Maximum current (I) Compressor current (CT) ASH220NCDWA 12.5A ASH324NCDWA 13.5 ASH436NCDWA If the temperature reaches 150 F(66 C) three times in one hour, the system will lock out.
Page 26: Low Pressure Protection
Operations Low Pressure Protection With the compressor running, if the low pressure switch opens for 1 minute, the compressor will stop. If this condition occurs 3 times in an hour, the compressor will lock out and a low pressure error code will be displayed at the indoor unit.
Page 27: Oil Return Cycle
If the system stops during an oil return cycle due to an error code, the cycle timing will resume when the system restarts after the error is cleared. If there is a switch from heating to cooling, or from cooling to heating during the oil return cycle Operations timing, and the system stops due to an error code, the oil return cycle will occur immediately when the error code is cleared.
Page 28: Testing
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 29: 4-Way Valve
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. During cooling mode de-energized operation, the internal slide will direct compressor hot gas to the outdoor coil.
Page 30: Variable Speed Compressor
Testing Topic Title 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.
Page 31: Wiring Diagrams
Wiring Diagrams Topic Title ASH220NCDWA DC-FAN Base Pan Heater Reactor MOTOR 4-WAY VALVE CRANKCASE HEATER GRAY BL Y W B P1(L) FUSE FG Vsp Vcc CON9 F30A 250VAC CN11 P2(N) Electrolytic CON8 1 2 3 4 5 6 7 8...
Page 32 Wiring Diagrams Topic Title ASH324NCDWA DC-FAN MOTOR Base Pan Heater Reactor 4-WAY VALVE CRANKCASE HEATER GRAY BL Y W B P1(L) FUSE FG Vsp Vcc CON9 F30A 250VAC CN11 P2(N) Electrolytic CON8 1 2 3 4 5 6 7 8 CN15 Capacitor TO Module...
Page 33 ENGLISH Wiring Diagrams Topic Title ASH436NCDWA 0150538688 abbreviation Sensor DC FAN 4-WAY Tc: Condensing Temp. CRANKCASE BASE PAN MOTOR VALVE Ts: Compressor Suction HEATER HEATER Temp. Ta: Ambient Temp. BL Y W B Td: Compressor Discharge ACL(L1) ’ ’ Te: Defrosting Temp. FG Vsp Vcc CON9 ACL(L2)
Page 34 Power input restrict invalid ---- ---- OFF* ---- ---- ---- ---- ---- Power input restrict valid ---- ---- ---- ---- ---- ---- ---- ASH220NCDWA ---- ---- ---- ---- ---- ASH324NCDWA ---- ---- ---- ---- ---- Factory use only ---- ---- ---- ----...
Page 35 DIP Switch Settings Topic Title SW6 DIP Switch Settings Outdoor central control address settings Outdoor Central SW6-1 SW6-2 SW6-3 SW6-4 Control Address SW7 DIP Switch Settings Description SW7-1 SW7-2 SW7-3 SW7-4 SW7-5 SW7-6 SW7-7 SW7-8 USA energy efficiency test mode for High Wall unit OFF* OFF* ----...
Page 36 Loss of synchronism detection Outdoor Unit Std. Value Max Value Indoor thermal overload ASH220NCDWA 30m/100ft. 50m/164ft. Indoor unit overload protection, heating mode only. ASH324NCDWA 30m/100ft. 60m/197ft. Indoor coil frosted ASH436NCDWA 40m/131ft. 70m/230ft. Module thermal overload Compressor start failure, over-current...
Page 37 WALL MOUNT TECHNICAL OVERVIEW ASYW07URDWA ASYW09URDWA ASYW12URDWA ASYW18URDWA Table of Contents Components ..................................C-2 Component Overview ................................. C-2 Indoor 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 ..............................
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
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...
Page 68 [This page intentionally left blank.]...
Page 69: Error Codes
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 duct connection flanges.
Page 71: 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 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
Testing Topic Title 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 Topic Title 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...
Page 78 [This page intentionally left blank.]...
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 Temperature Sensors
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: Indoor Fan Motor Voltage Check
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: Static Pressure Charts
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: Board Replacement
Testing Topic Title 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: Replacing Wifi Module
Testing Topic Title 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
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 CONSOLE TECHNICAL OVERVIEW USYF09UCDWA USYF12UCDWA USYF18UCDWA Table of Contents Components ..................................H-2 Component Overview .................................H-2 Indoor Circuit Board................................H-3 Testing ....................................H-4 Removing the Filter Cover & Filter ............................H-4 Front Cover Removal ................................H-4 Control Box Removal ................................H-4 Board Replacement ................................H-4 Upper Louver Removal ................................H-5 Lower Damper Assembly Removal .............................H-5 Replace Fan Motor ................................H-5 Indoor Fan Motor Test Procedure ............................H-6...
Page 94: 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 95: 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 96: Testing
Testing Topic Title 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 97: Upper Louver Removal
Testing Topic Title 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 98: Indoor Fan Motor Test Procedure
Testing Topic Title 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 99: Testing Temperature Sensors
Testing Topic Title 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 100: Testing Communication Circuit
Testing Topic Title 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 101: Wiring Diagram/Dip Switch Settings
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 102 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 103 TROUBLESHOOTING & REFERENCES Table of Contents Special Functions ..................................I-3 Auto Restart ...................................I-3 Forced Defrost ..................................I-3 Indoor Temperature Display (Highwall Only) ........................I-3 Enhanced Defrost ..................................I-3 Temperature Compensation ..............................I-4 Matching Tables ..................................I-6 Resistance Chart / Sensor Definitions .............................I-7 Resistance Values ...................................I-8 Louver Motors ..................................I-8 EEV ......................................I-8 Component Ratings ................................I-9 4-Way Valve ...................................I-9...
Page 104 [This page intentionally left blank.]...
Page 105: Special Functions
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 106: Temperature Compensation
Special Functions Temperature Compensation This function allows you the capability to adjust the temperature compensation offset of any indoor unit. The adjusted value is programmed into the EEPROM. IDU PCB part number Controls Needed Guide Series Haier Controller IR Reciever Wired Controller Reference 3X3 Cassette...
Page 107 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 108: Matching Tables
Matching Tables Topic Title ASH220NCDWA ASH436NCDWA 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 109: 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 110: Resistance Values
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 111: Component Ratings
Component Ratings Topic Title 4-Way Valve Ohms 2.1K 208-230 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 Abbr.
Page 112: Refrigeration Diagrams
Refrigeration Diagrams ASH220NCDWA 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 TC1 Ø2.7*Ø1.0*1400 Indoor unit A...
Page 113 Refrigeration Diagrams ASH436NCDWA 4U36EH2VHA Low pressure Suction temp. switch 4-way valve coil: sensor Ts Comp- Refrigerant flow in cooling ressor Refrigerant flow in heating Discharge temp. sensor Accumulator separator Capillary tube Unit A gas pipe temp. sensor Tc1 Ø2.7*Ø1.0*1400 Indoor unit A High pressure switch Unit B gas pipe temp.
Page 114 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 115: 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 116 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 117 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 118 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 119: 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 120: 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 121: 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 122: Flow Charts
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 123: 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 124: Discharge Temperature Too High Protection
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 125: 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 126: 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 127: 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 128: 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 129: 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 130 GE Appliances, A Haier Company Appliance Park, Louisville, KY 40225 ©2020 GE Appliances, A Haier Company Issued Date: 10/08/2020...

This manual is also suitable for:

Ash324ncdwa Ash436ncdwa Asyw07urdwa Asyw09urdwa Asyw12urdwa Asyw18urdwa ... Show all

GE ASH220NCDWA Service Manual

Introduction

Ash324Ncdwa Ash436Ncdwa

Asyw07Urdwa Asyw09Urdwa Asyw12Urdwa Asyw18Urdwa

Ab09Sc2Vha Ab12Sc2Vha Ab18Sc2Vha

Al24Lp2Vha

Ad07Sl2Vhb Ad09Sl2Vhb Ad12Sl2Vhb Ad18Sl2Vhb

Usym09Ucdsa Usym12Ucdsa Usym18Ucdsa Usym24Ucdsa

Usyf09Ucdwa Usyf12Ucdwa Usyf18Ucdwa

Table of Contents

Quick Links

Chapters

Related Manuals for GE ASH220NCDWA

Summary of Contents for GE ASH220NCDWA

This manual is also suitable for:

Table of Contents