TECHNICAL SERVICE GUIDE

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1 GE Consumer Home Services Training TECHNICAL SERVICE GUIDE Zoneline Vertical Air Conditioners Case Zoneline unit Front MODEL SERIES: AZE09DAC AZH09DAC AZE09EAC AZH09EAC AZEDAC AZHDAC AZEEAC AZHEAC AZEDAC AZHDAC AZEEAC AZHEAC PUB # /0

2 ! IMPORTANT SAFETY TICE The information in this service guide is intended for use by individuals possessing adequate backgrounds of electrical, electronic, and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use. WARNING To avoid personal injury, disconnect power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. RECONNECT ALL GROUNDING DEVICES If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened. GE Consumer Home Services Training Technical Service Guide Copyright 00 All rights reserved. This service guide may not be reproduced in whole or in part in any form without written permission from the General Electric Company.

3 Table of Contents Table of Contents Introduction... Nomenclature... Electrical Specifications... Technical Data... Features and Operation... ON/OFF Switch... Dip Switches... Main Board Terminal Strip...9 Remote Thermostat Control... 0 Central Desk Control (CDC)... 0 Temperature Limiting... Freeze Sentinel... Fan Speed (Indoor Fan)... Energy Management System... Door Sensor (kit)... Motion Sensor (kit)... Room Air Sensor (kit)... Automatic Defrosting of Indoor and Outdoor Coils... Ventilation Control... Cool Mode Operation... Heat Mode Operation... Slide-Out Chassis... Front Removal... Side Removal... Components... 9 Main Board... 9 Driver Board... 9 Fuse... 9 Sub Board... 9 Compressor and Capacitor... 0 Filter/Dryer... 0 Resistance Heaters... Indoor Fan and Capacitor... Outdoor Fan and Capacitor... Reversing Valve... 0 Transformer... Thermistors... Thermostatic Drain Valve... Dead Unit Troubleshooting... Schematics and Wiring Diagrams... Component Locator Views... 0 Parts List... Care and Cleaning... Warranty...

4 Introduction Case Zoneline unit Front The new Zoneline Vertical Air Conditioners are ideal for hotel/motel installations. Programmable for central desk control, electric heat, freeze sentinel, fan speed, and temperature limiting, these units allow for efficient control of power usage. The Energy Management System is also available, providing automatic comfort at peak energy efficiency. The information on the following pages will help you service the Zoneline Vertical Air Conditioners effectively and efficiently.

5 Nomenclature Model Number AZ E 09 D A C Zoneline Chassis Series C = Corrosion A = Revision D = 0/0 V E = V E = Cooling w/electric Resistance Heat H = Cooling w/heat Pump and Electric Resistance Heat BTU/hr 09 = 9000 = 000 = 000 Model/Serial Tag Location Serial Number The first two characters of the serial number identify the month and year of manufacture. Example: AD = January, 00 The model/serial tag is located on the front upper left-hand corner of the unit. This tag contains important information such as: Model/serial number Refrigerant charge Voltage rating Heat and cool amperes Heat resistance amperes BTU/hR A - JAN D - FEB F - MAR G - APR H - MAY L - JUN M - JUL R - AUG S - SEP T - OCT V - V Z - DEC 00 - H 00 - G 00 - F 00 - D 00 - A Z V 99 - T 99 - S 99 - R 99 - M 99 - L The letter designating the year repeats every years. Example: T - 9 T - 9 T - 99 Note: The technical sheet is located on the front left side of the unit under the model/serial tag.

6 Wire Size and Breaker Size Electrical Specifications Warning: All wiring, including installation of the receptacle, must be in accordance with the National Electric Code, local codes, ordinances, and regulations. Use only the wiring size recommended for single outlet branch circuit. Use only the type and size fuse of HACR circuit breaker indicated on the unit s rating plate. Proper current protection is the responsibility of the owner. Recommended branch circuit wire sizes* Nameplate maximum circuit breaker size AWG Wire size** A 0A 0A 0 AWG American Wire Gauge * Single circuit breaker from main box ** Based on copper wire, single insulated conductor at 0 C Note: Use copper conductors only. Power Supply Kits Tandem Amp. Perpendicular 0 Amp. Large Tandem 0 Amp. /0/0 Volt Power Supply Kits Wall Plug Configuration Circuit Protective Device Heater 0/0 volts RAK RAK0 RAK0 RAK RAK0 RAK0 Tandem Perpendicular Large Tandem Direct Connect Direct Connect Direct Connect Amp time Delay Fuse or Breaker 0 Amp time Delay Fuse or Breaker 0 Amp time Delay Fuse or Breaker Amp time Delay Fuse or Breaker 0 Amp time Delay Fuse or Breaker 0 Amp time Delay Fuse or Breaker./.09 KW./. KW.00/.0 KW. KW. KW.00 KW

7 Direct Connection 0 VAC 0 VAC VAC

8 Technical Data Heat Pump Model AZHDAC DISCONNECT POWER BEFORE SERVICING IMPORTANT - RECONNECT ALL GROUNDING DEVICES All parts of this appliance capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened. IMPORTANT SAFETY TICE This information is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use. WARNING DISCONNECT UNIT FROM ELECTRICAL POWER SUPPLY BEFORE MAKING ANY ELECTRICAL CHECKS. MAXIMUM CURRENT LEAKAGE: 0. MILLIAMP MAXIMUM GROUND PATH RESISTANCE: 0. OHM POWER SUPPLY RATED VOLTAGE VOLTAGE LIMITS 0/0 - REPLACEMENT PARTS FILTER Check for cleanliness. DESCRIPTION OWER (I.D.) CAPACITOR, I.D. MOTOR CAPACITOR, O.D. MOTOR CAPILLARY () (CUT TO /") COMPRESSOR CONDENSER DRIVE PWB EVAPORATOR FAN (O.D.) FILTER/DRYER FUSE, TRANSFORMER PRIMARY HEATER ASSEMY MAIN PWB MOTOR, OWER (I.D.) MOTOR, FAN (O.D.) PROTECTOR, COMPRESSOR PROTECTOR, HEATER- (resettable) PROTECTOR, HEATER- (one-time) REVERSING VALVE REVERSING VALVE COIL RUN CAPACITOR SUB PWB THERMISTOR TRANSFORMER VARISTOR CAT.. WJX009 WJ0X000 WP0X000 WJX WJ9X000 WJX00 WJX00 WJX00 WJX000 WJX0 WJX000 WJ0X00 WJX000 WJX00 WJX00 WPX000 WPX000 WPX000 WJX000 WJX00 WJ0X WJX00 WJX00 WPX00 WPX000 SENSOR RESISTANCE (OHM) F INDOOR COIL OUTDOOR COIL OUTDOOR AIR CONDENSER. Check for blockage with dirt, or other material.. Check for corrosion. RUNNING CURRENT With unit in case, operate for ten minutes on Hi-Cool. Following are the operating limits: CURRENT-TEMPERATURE CHECK DATA AIR TEMPERATURE COOLING CURRENT CONDENSER IN F 0V-MIN. MAX. 0V-MIN. MAX TEMPERATURE DIFFERENTIAL - COOLING Unit must operate for one hour with thermostat at coldest setting prior to measuring air temperatures. Following are the normal limits: TEMPERATURE DIFFERENTIAL CHECK DATA EVAPORATOR EVAPORATOR AIR TEMPERATURE AIR TEMPERATURE OUT F IN F 0V-MIN. MAX. 0V-MIN. MAX RUNNING CURRENT With unit in case, operate for ten minutes on Hi-Heat. Following are the operating limits: CURRENT-TEMPERATURE CHECK DATA AIR TEMPERATURE REVERSE CYCLE HEATING CURRENT OUTDOOR COIL IN F 0V-MIN. MAX. 0V-MIN. MAX TEMPERATURE DIFFERENTIAL - HEATING Unit must operate for one hour in reverse cycle heating prior to measuring air temperatures. Following are the normal limits: TEMPERATURE DIFFERENTIAL CHECK DATA INDOOR COIL INDOOR COIL AIR TEMPERATURE AIR TEMPERATURE OUT F IN F 0V-MIN. MAX. 0V-MIN. MAX RUN CAPACITOR CHECK WIRING - COMPRESSOR DIRECT CHECK. Replace unit run capacitor with a known TEST CAPACITOR CAUTION: good test capacitor. Keep head clear of terminal RATED COMPRESSOR which may be 0 MFD WHITE VOLTAGE TERMINALS area when cover is removed. RED higher than specified START. Check windings first. If open ACK RUN S C O R and attempt to start R or grounded, DO T compressor. COMMON apply power to compressor S. If compressor starts, terminals. install a new run C GROUND GROUND TEST KIT COMPRESSOR ACK capacitor which has TO UNIT OVERLOAD a rating specified for COMPRESSOR WIRING the unit. Pub. No. -00 Page Z-0

9 Electric Resistance Heat Model AZEDAC DISCONNECT POWER BEFORE SERVICING IMPORTANT - RECONNECT ALL GROUNDING DEVICES All parts of this appliance capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened. WARNING DISCONNECT UNIT FROM ELECTRICAL POWER SUPPLY BEFORE MAKING ANY ELECTRICAL CHECKS. MAXIMUM CURRENT LEAKAGE: 0. MILLIAMP MAXIMUM GROUND PATH RESISTANCE: 0. OHM POWER SUPPLY RATED VOLTAGE VOLTAGE LIMITS 0/0 - REPLACEMENT PARTS DESCRIPTION OWER (I.D.) CAPACITOR, I.D. MOTOR CAPACITOR, O.D. MOTOR CAPILLARY () (CUT TO ") COMPRESSOR CONDENSER DRIVE PWB EVAPORATOR FAN (O.D.) FILTER/DRYER FUSE, TRANSFORMER PRIMARY HEATER ASSEMY MAIN PWB MOTOR, OWER (I.D.) MOTOR, FAN (O.D.) PROTECTOR, COMPRESSOR PROTECTOR, HEATER- (resettable) PROTECTOR, HEATER- (one-time) RUN CAPACITOR SUB PWB THERMISTOR TRANSFORMER VARISTOR CAT.. WJX009 WP0X000 WP0X000 WJX WJ9X000 WJX009 WJX00 WJX00 WJX000 WJX0 WPX000 WJ0X00 WJX000 WJX00 WJX00 WPX000 WJX000 WJX000 WJ0X WJX00 WJX00 WPX00 WPX000 IMPORTANT SAFETY TICE This information is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use. RUNNING CURRENT With unit in case, operate for ten minutes on Hi-Cool. Following are the operating limits: CURRENT-TEMPERATURE CHECK DATA AIR TEMPERATURE COOLING CURRENT CONDENSER IN F 0V-MIN. MAX. 0V-MIN. MAX TEMPERATURE DIFFERENTIAL - COOLING Unit must operate for one hour with thermostat at coldest setting prior to measuring air temperatures. Following are the normal limits: TEMPERATURE DIFFERENTIAL CHECK DATA EVAPORATOR EVAPORATOR AIR TEMPERATURE AIR TEMPERATURE OUT F IN F 0V-MIN. MAX. 0V-MIN. MAX RUN CAPACITOR CHECK. Replace unit run capacitor with a known good test capacitor which may be 0 MFD higher than specified and attempt to start compressor.. If compressor starts, install a new run capacitor which has a rating specified for the unit. RATED VOLTAGE GROUND TEST CAPACITOR TEST KIT COMPRESSOR TERMINALS START RUN S C R COMMON GROUND TO UNIT SENSOR RESISTANCE (OHM) F INDOOR COIL FILTER Check for cleanliness. CONDENSER. Check for blockage with dirt, or other material.. Check for corrosion. WIRING - COMPRESSOR DIRECT CHECK CAUTION:. Keep head clear of terminal area when cover is removed.. Check windings first. If open or grounded, DO T apply power to compressor terminals. ACK WHITE C COMPRESSOR ACK OVERLOAD COMPRESSOR WIRING O S RED R

10 Features and Operation ON/OFF Switch Warning: ON/OFF switch does not disconnect power from all circuits. The ON/OFF switch is located on the electronics cover behind the front case panel. The ON/OFF switch disables all relays but does not disconnect power from all circuits. No functions are available when the switch is off. Dip Switches The dip switches are located behind the front case panel, through an opening on the front of the unit. The top row of dip switches control Temperature Limiting. The bottom row of dip switches control the heat pump lockout, Freeze Sentinel, constant fan, Energy Management System, and indoor fan speed. The dip switches will be set in the down position from the factory. Dip Switches ON/OFF Switch TL (C) (Temp. Limit Cool) TL (C) (Temp. Limit Cool) TL (C) (Temp. Limit Cool) ALL IR (Heat pump lockout) When this switch is up, heat pump operation is locked out. Only electric resistance heat is available when switch is up. Note: Not ALL all I R models (All Electric areheat) (on some models) equipped with heat pumps. FREEZ Refer S (Freeze Sentinel) to the Nomenclature CONST chapter FAN to (Constant ON Fan) determine if your model is equipped with a heat pump. FREEZ S (Freeze Sentinel) Refer to the Freeze Sentinel section of this chapter for more information. TL (H) (Temp. Limit Heat) TL (H) (Temp. Limit Heat) TL (H) (Temp. Limit Heat) T USED No Function (Reserved for future use) DUCT DUCT(Blower Fan) OCCUPIED (Occupancy Sensor) This switch, in conjunction with the thermostat connection, controls indoor fan speed. Refer to the Fan Speed section of this chapter for more information. OCCUPIED Refer to the Energy Management System section of this chapter for more information. CONST FAN When this switch is up, the fan runs continuously at high speed even if unit is off.

11 Main Board Terminal Strip Caution: Improper wiring may damage the Zoneline electronics. Damage or erratic operation may result. No common busing is permitted. A separate wire pair must be run from each separate controlling switch to each individual Zoneline. The terminal connections are located behind the front case panel. Insert the building hookup wires into the bottom of the terminal and tighten screw securely to make the desired connections. Route any wires from the terminal connections through the case loop. Terminal Connections GEA00 ON/OFF Switch Room Air Sensor Motion Sensor Door Sensor Central Central Desk Control Desk Control Common Ground - Ground White Heater - Signal Yellow Compressor - Cool Signal Unused Black Reversing Valve Green High - Speed Fan Fan Green Low - Low Speed Fan Fan Red - V VAC only Only 9

12 Remote Thermostat Control The unit is controlled by an externally mounted, remote thermostat. The Zoneline thermostat connections provide VAC only. If using a digital/electronic wall thermostat, it must be set to the VAC setting. Refer to the thermostat installation instructions for details. Note: Some thermostats can be programmed to energize the reversing valve in heating mode or cool mode. If the thermostat is not programmed correctly, the unit will heat when the thermostat is set to cool and cool when the thermostat is set to heat. Refer to the instructions provided with the thermostat for thermostat programming procedures. Also refer to the Reversing Valve section of the Components chapter for more information. Central Desk Control (CDC) Red Red - VAC V Only only Green Green Low - Fan Speed Speed Fan Green Green High - Fan Speed Speed Fan Black Reversing Unused Valve Yellow Compressor - Cool Signal White White Heater - Signal Common Ground - CLASS REMOTE THERMOSTAT V FAN (L) FAN (H) COOL HEAT COM 9 0 MAIN BOARD GEA0 0

13 When a CDC switch is connected to the main board terminal strip, the unit can be turned on and off from a remote location. Up to 000 feet of wire may be used to connect a remote CDC switch to the unit. A separate wire pair must be run from each CDC switch to each Zoneline. Multiple units cannot be run from the same CDC switch. Central Desk Control The remote CDC switch will be closed when the unit is off. REMOTE CDC SWITCH CLOSED = UNIT OFF REMOTE CDC SWITCH OPEN = UNIT ON Note: The Freeze Sentinel is still operational when the remote CDC switch has turned the unit off (room air sensor must be installed and Freeze Sentinel dip switch must be in the down position for the Freeze Sentinel to operate). CDC SWITCH MAIN BOARD GEA0 Temperature Limiting Temperature limiting limits the lowest temperature that can be set for cooling and the highest temperature that can be set for heating. The dip switches are used to control temperature limiting. Temperature limiting is dependent on the Room Air Sensor (kit). If the Room Air Sensor (kit) is not installed, temperature limiting will not operate. Temperature limiting is not dependent on the Occupied dip switch, Motion Sensor (kit), or Door Sensor (kit). Freeze Sentinel TL (C) (Temp. Limit Cool) TL (C) (Temp. Limit Cool) TL (C) (Temp. Limit Cool) TL (H) (Temp. Limit Heat) TL (H) (Temp. Limit Heat) TL (H) (Temp. Limit Heat) Temperature Limiting During Cool Mode Temperature Limiting During Heat Mode Up Down Minimum Maximum Up Down Minimum Maximum None,, 0 F F, F F, F F, F F, 0 F F,, None F F, F F, F F None,, 0 F F, 0 F 0 F, 0 F F, 0 F F, 0 F F,, None 0 F F, 0 F 0 F, 0 F F

14 The Freeze Sentinel is enabled by a dip switch and is dependant on the Room Air Sensor (kit). If the Room Air Sensor (kit) is not installed, the Freeze Sentinel will not operate. The FREEZE S dip switch must be down for Freeze Sentinel operation. FREEZE S SWITCH DOWN = ON FREEZE S SWITCH UP = OFF OCCUPIED DUCT The Freeze Sentinel turns on the resistance heater(s) and indoor fan when the Room Air Sensor (kit) sees F. When the temperature of the room has risen to F, the unit will turn off. The Freeze Sentinel will remain enabled when the unit has been turned off by the remote Central Desk Control. ALL I R (All Electric Heat) FREEZE S (Freeze Sentinel) CONST FAN Fan Speed (Indoor Fan) The Indoor fan operates at one speed during unit operation. The duct dip switch, in conjunction with the thermostat connection, controls at what speed the indoor fan operates. Fan Speed Door Sensor When the green thermostat wire is connected to the high speed fan (GH) terminal: DUCT SWITCH UP = HIGH FAN SPEED DUCT SWITCH DOWN = MEDIUM FAN SPEED When the green thermostat wire is connected to the low speed fan (GL) terminal: DUCT SWITCH UP = MEDIUM FAN SPEED DUCT SWITCH DOWN = LOW FAN SPEED

15 Energy Management System The following conditions must exist for the Energy Management System to operate: OCCUPIED dip switch is up. Room Air Sensor (kit) is installed. Door Sensor (kit) is installed. Motion Sensor (kit) is installed. The Energy Management System uses input from the Door Sensor (kit) and Motion Sensor (kit) to establish if the room is occupied or unoccupied. When the Energy Management System has established that the room is unoccupied, it uses input from the Room Air Sensor (kit) and allows the temperature of the room to lower to F (heat mode) or raise to F (cool mode). When the room becomes occupied, the Energy Management System will return to thermostat-controlled operation and will return the room to the temperature set on the thermostat. ROOM AIR SENSOR MOTION SENSOR DOOR SWITCH CDC SWITCH MAIN BOARD Schematic shown with unit on, door closed, and motion sensed. 9 GEA0 Door Sensor (kit) The door sensor has a two-wire circuit that is connected to the main board terminal strip. When the door opens, the door sensor (switch) closes. When the Energy Management System sees the door sensor circuit close (door opened), the Energy Management System will then check the motion sensor circuit. Note: The Energy Management System is dependent on the Room Air Sensor, Motion Sensor, and Door Sensor. If the Room Air Sensor, Motion Sensor, and Door Sensor are not installed, the Energy Management System will not operate. Door Sensor DOOR OPEN = SENSOR (SWITCH) CLOSED DOOR CLOSED = SENSOR (SWITCH) OPEN MAIN BOARD OUTPUT TO DOOR SENSOR = VAC No motion detected by motion sensor. Unit continues to be controlled by thermostat. The following conditions must exist for the energy management system to operate: Occupied dip switch is up. Room Air Sensor (kit) installed. Door Sensor (kit) installed. Motion Sensor (kit) installed. When the door opens, the unit will check the motion sensor. Motion detected by motion sensor. Unit switches to Room Air Sensor control. Unit will lower temperature of room to F (heat mode) or raise the temperature of room to F (cool mode).

16 Motion Sensor (kit) The motion sensor has a -wire circuit that is connected to the main board terminal strip. The motion sensor is an electronic sensor that, when motion is sensed, closes a switch (internal to the sensor), completing the motion sensor circuit. After the Energy Management System has seen the door sensor circuit closed (door opened), it will check the motion sensor circuit. If the Energy Management System sees the motion sensor circuit closed (no motion detected by the sensor), it will then check the temperature being reported by the room air sensor. If the Energy Management System sees the motion sensor circuit open (motion detected by sensor), the unit will continue to be thermostat-controlled. Motion Sensor MOTION = SENSOR (SWITCH) CLOSED MOTION = SENSOR (SWITCH) OPEN MAIN BOARD OUTPUT TO MOTION SENSOR = VAC Note: The Energy Management System is dependent on the Room Air Sensor, Motion Sensor, and Door Sensor. If the Room Air Sensor, Motion Sensor, and Door Sensor are not installed, the Energy Management System will not operate. Room Air Sensor (kit) The room air sensor is a thermistor with a negative coefficient (as temperature rises, resistance goes down). The sensor has a -wire circuit that is connected to the main board terminal strip. The room air sensor is used for Temperature Limiting and for the Energy Management System. When the Energy Management System sees the door sensor circuit close and then the motion sensor circuit close (room unoccupied), the Energy Management System will ignore the thermostat and check the temperature reported by the room air sensor. Based on the input from the room air sensor, the Energy Management System will allow the temperature of the room to lower to F (heat mode) or raise to F (cool mode). Note: The Energy Management System is dependent on the Room Air Sensor, Motion Sensor, and Door Sensor. If the Room Air Sensor, Motion Sensor, and Door Sensor are not installed, the Energy Management System will not operate. Room Air Sensor MAIN BOARD OUTPUT TO ROOM AIR SENSOR = VDC Room Air Sensor Resistance Values Temperature Resistance F 0 kω F 0 kω F 0 kω F 9 kω 9 F kω

17 Automatic Defrosting of Indoor and Outdoor Coils During continued compressor operation, there is potential for ice to form on the indoor coil when in cool mode and for ice to form on the outdoor coil when in heat mode. The Zoneline is equipped with Automatic Defrost to eliminate this potential problem. Indoor coil defrost will occur when the indoor coil thermistor reads a temperature of F or less for a duration of minutes. The main board will automatically shut the compressor off, allowing the indoor coil temperature to rise. The fans will continue to operate throughout the defrost cycle for continued air circulation. When the indoor coil thermistor detects a temperature of 0 F or above, the compressor will resume normal operation. A -minute minimum compressor off time will be in effect. Outdoor coil defrost will occur for one of the following reasons: The outdoor temperature thermistor reads a temperature of F or less for a duration of hours and 9 minutes. The accumulated run time of the compressor is greater that hours with an outdoor temperature of F or less. The outdoor coil is defrosted by reverse cycle defrosting (reversing the direction of the refrigerant flowing through the sealed system). This will cause hot refrigerant flowing through the outdoor coil to quickly and efficiently melt any ice that has formed. Outdoor coil defrosting will terminate when the outdoor coil thermistor reads a temperature of F or when a period of 9 minutes has elapsed, whichever comes first. When outdoor defrosting has been completed, the resistance heater(s) and fans will run for a minimum of 90 seconds or until the room has reached the thermostat set point. Ventilation Control The ventilation control lever is located on the left side of the Zoneline unit, behind the front case panel. When the lever is in the CLOSE position, only air inside the room is circulated and filtered. When the lever is in the OPEN position, some outdoor air will be drawn into the room. This will reduce the heating or cooling efficiency. Open Vent control (push lever down and pull forward or back to operate) Close

18 Cool Mode Operation Note: Minimum compressor/fans off time is minutes +/- 0 seconds. Reversing valve is energized at all times in cool mode. Reversing valve is not de-energized when thermostat is satisfied. Indoor and outdoor fans always operate at the same time in cool mode. Currently Cooling Indoor fan, outdoor fan, compressor, reversing valve energized. Thermostat satisfied. Indoor fan, outdoor fan, compressor off. Currently Off Set thermostat to cool. Adjust thermostat to setting below room temperature. Indoor fan, outdoor fan, reversing valve energized. SECOND DELAY Compressor energized. Thermostat not satisfied. SECOND DELAY Indoor fan, outdoor fan energized.

19 Heat Mode Operation Note: Minimum compressor/fans off time is minutes +/- 0 seconds. Heat pump will not operate if outdoor thermistor sees F or less. Heat pump and resistance heater(s) do not operate at the same time. Indoor and outdoor fans operate at the same time, with the following exception: Should the indoor coil temperature reach F, the outdoor fan will stop until the indoor coil temperature lowers to F. Heat pump model currently off with an outdoor temperature above F. Set thermostat to heat mode. Adjust thermostat to setting above room temperature. Indoor fan, outdoor fan, resistance heaters energized. Thermostat satisfied. Indoor fan, outdoor fan, resistance heaters off. Heat pump model currently heating with an outdoor temperature above F. Indoor fan, outdoor fan, compressor energized. Thermostat satisfied. Indoor fan, outdoor fan, compressor off. Thermostat not satisfied. Compressor on. SECOND DELAY Indoor fan, outdoor fan on. Nonheat pump model currently off or heat pump model currently off with an outdoor temperature below F. Set thermostat to heat mode. Adjust thermostat to setting above room temperature. Nonheat pump model currently heating or heat pump model currently heating with an outdoor temperature below F. Indoor fan, outdoor fan, resistance heaters energized. Thermostat satisfied. Indoor fan, outdoor fan, resistance heaters off. Thermostat not satisfied. Thermostat satisfied. Indoor fan, outdoor fan, resistance heaters energized.

20 Slide-Out Chassis WARNING: Case ground bolt at front of chassis must be installed to ensure proper grounding of the unit. Case ground screw on left hand cabinet side plate and/or right hand cabinet side plate must be installed to ensure proper grounding of the unit. Screws Cabinet Top Plate Front Removal. Remove screws and the front panel.. Remove the /-in. (case ground) bolt fastening the chassis to the base of the cabinet.. Remove the case ground screw from the lefthand side cabinet side plate and/or the righthand cabinet side plate.. Turn screws on the cabinet top plate counterclockwise to the raise duct connector to stop.. Slide the chassis out of the cabinet. Case Ground Screw /-in. Bolt (Case Ground) Side Removal Note: If slide-out chassis cannot be removed from the front, perform the first steps of Front Removal above and proceed with Side Removal below. Pull Chassis Forward. Remove screws and the cabinet side plate.. Move the chassis out of the front of the cabinet approximately inches.. Slide the chassis out from the side of the cabinet. Slide Out Side

21 Components Main Board To access the main board:. Remove screws and the front panel.. Unplug the heater connector. WARNING: Do not touch the capacitors after the electronics cover is removed. Caution: When removing electronics cover, pull the right side out a few inches to avoid damage to the switch wires.. Remove screws from the electronics cover.. Lift the electronics cover to access the sub board. Unplug the ON/OFF switch from the sub board at connector CN0 and remove the cover. Electronics Cover ON/OFF Switch Heater Connector Driver Board To access the driver board: Main Board Sub Board Driver Board Remove the electronics cover (see Main Board section). Fuse Fuse A -amp fuse is located on the driver board, and is common to the transformer circuit. If this fuse blows (open), all relays and the remote thermostat will not function. Sub Board To access the sub board: Remove the electronics cover (see Main Board section). 9

22 Compressor and Capacitor The Zoneline compressor is a rotary type that operates on /0/0 VAC. After the compressor has cycled off, it will not attempt to restart for minutes + /-0 seconds, regardless of the state of the thermostat. This will allow internal pressure to equalize and prevent the compressor from stalling by trying to start against high pressure in the sealed system. Current flow into the compressor is monitored by the main board to determine if the compressor is running or locked. If the run signal is sent and a locked condition is detected for seconds, the run signal will stop and a -minute count will begin. After the -minute count, the run signal is sent again. If the compressor starts, the count is reset and the unit functions normally. If the compressor does not start after consecutive attempts, the control will determine that a compressor failure has occurred and a beeping alarm will sound. The alarm will continue until the compressor failure condition is reset by turning the unit off at the ON/ OFF switch or by removing power to the unit. Compressor Capacitor Compressor The compressor overload is internal to the compressor for 000 BTU models and is located under the relay/overload cover for 9000 and 000 BTU models. Should the overload trip (open) it will open the common line to the compressor, stopping compressor operation. A copper process tube is provided for access to the low-pressure side of the refrigeration system. The compressor capacitor is located under the electronics cover, above the driver board. Filter/Dryer The filter/dryer for heat pump models is located in the horizontal section of the discharge tube between the compressor and reversing valve. The filter dryer for electric resistance heat models is located in the liquid tube between the condenser and the capillaries. Compressor Resistance Values Compressor Size 9000 BTU 0/0 VAC 000 BTU 0/0 VAC 000 BTU 0/0 VAC Winding C to R Winding C to S. Ω. Ω. Ω. Ω Ω. Ω 0

23 Note: On 000 BTU models, overload protection is internal to the compressor. 9 GR GY C 9 GR GY R COMP. MOTOR S O. L. P. RUN. CAP. OR BR SUBBOARD RY0 VAC 0/0 VAC DRIVER BOARD RY0 RY0 RY0 CN MAIN BOARD GEA0 Compressor Troubleshooting Note: Minimum comp./ fans-off time is min. Fan-on may be delayed. Set the thermostat to heat mode or cool mode. Adjust the temperature set point so that the unit will begin to cool or heat. Are both fans running? Go to Dead Unit troubleshooting. Is the compressor short cycling or not operating at all? T OPERATING Unplug the unit. Move the black wire from upper lefthand terminal (terminal ) of relay RY0 to lower righthand terminal (terminal ) of relay RY0. Turn the ON/ OFF switch OFF. Plug the unit in. Turn the switch ON. Check for VAC from main board terminal strip terminal to terminal. Voltage present? SHORT CYCLING Note: Compressor will remain off for minutes. When compressor comes on, check lines to indoor coil. Are compressor lines cold? Compressor and overload are suspect. Check compressor and overload. Does compressor come on? Check for line voltage at compressor between the C and R terminals? Voltage present? Thermostat or wiring. Replace the black wire from the lower right-hand terminal (terminal ) of relay RY0 to the upper left-hand terminal (terminal ) of relay RY0. Compressor or Capacitor. Reversing valve is stuck in the heat position. Diagnose reversing valve. Check: Circuit from RY0 to compressor. Circuit from RY0 to compressor. Driver board power-supply circuit from relay RY0 to relay RY0. Replace main board. Check for VDC at main board CN between terminals and 0. Voltage present? Replace driver board.

24 Resistance Heaters The heaters consist of three VAC or 0/0 VAC resistance heating coils fastened together in a single assembly. The heaters are located behind the indoor coil and are protected against overheating by thermal protectors. An L-0 thermal protector is used as a temperature regulator. A one-shot L thermal protector is used as a backup in case the temperature regulating thermal protector fails (stuck closed). Heat Pump models will utilize electric resistance heat upon initial heat mode startup or when a power outage has occurred with the unit in heat mode. The electric heaters will be energized until the room temperature reaches the thermostat setting. Once the thermostat temperature setting is attained, the unit will cycle off and automatically switch over to heat pump operation. The heat pump will provide all heating requirements for subsequent cycles unless one of the following conditions occur: The dip switch has been placed in the IR (ALL ELECTRIC HEAT) position. When the dip switch is placed in the up position, heat pump operation will be locked out. Only electric resistance heat will be available. A temperature differential of approximately F (temperature differential varies by thermostat manufacturer) is detected between the thermostat set point and the room air temperature. If a differential of approximately F is detected, due to thermostat adjustment or falling room air temperature, the electric heaters will be energized (heat pump off) until the thermostat is satisfied. Once the thermostat has been satisfied, the unit will automatically revert back to heat pump operation for subsequent cycles. The outdoor temperature falls below F. If the outdoor temperature falls below F, the unit will automatically switch from heat pump operation to resistance heat operation. A F hysteresis loop will be in effect; therefore, the unit will operate in resistance heat mode until an outdoor temperature of F or higher is detected. Electric resistance heat and heat pump operation will never occur at the same time. Models without heat pump feature will meet heating requirements by use of electric resistance heating coils. Heater Resistance Values When checked at connector When checked at heater Large Tandem 0 Amp. Perpendicular 0 Amp. WH WH GY RD GR GY RD GR 9 9 Black to White Black to Red 9 WH GR RD GY BR 0/0 VAC VAC: 0 Ω 0/0 VAC: Ω VAC: Ω 0/0 VAC: Ω Upper Coil Middle Coil Lower Coil VAC: 9 Ω 0/0 VAC: 0 Ω VAC: Ω 0/0 VAC: Ω VAC: 0 Ω 0/0 VAC: Ω RY0 HEATER UNIT WH UPPER RD MIDDLE PROTECTOR LOWER RD HEATER CONN RY0 PROTECTOR DRIVER BOARD 9 Tandem Amp. WH RD GY GR CN MAIN BOARD GEA0

25 Resistance Heater Troubleshooting Note: Normal heat is provided by heat pump operation when outdoor temperature is above F. The number of heaters that operate is dependant on the Power Supply Kit used. Tandem - heater Perpendicular - heaters Large Tandem - heaters Place thermostat in heat mode. Set thermostat to setting F above room temperature. Do heaters come on? Monitor heater operation. Do heaters short cycle? Replace faulty thermal protector. Normal operation Go to Dead Unit trouble shooting. Does the indoor fan come on? Place dip switch in IR lockout. Do heaters come on? Check for VAC at main board terminal strip (CN) between terminal (white) and terminal (common). Replace main board. Is VAC present? Check resistance at heater. Resistance OK? Check heater resistance at heater connector. VAC to R = to W = 0 0/0 VAC to R = to W = Replace thermostat. Resistance OK? Replace heater. Repair faulty wiring. Replace faulty protector. Check for continuity through both thermal protectors. Continuity? With thermostat calling for heat, check for line voltage between RY0 (orange wire/brown wire) and RY0 (black wire). Check for open wire between RY0 and heaters. Check for open wire between RY0 and power cord connector. Check for open wire between power cord connector and heaters. Line voltage present? Replace main board. Check for VDC between CN pin to CN pin 0. Check for VDC between CN pin to CN pin 0. Replace driver board. VDC present? VDC present? Replace main board.

26 To remove the resistance heaters:. Remove the front panel and slide the chassis forward approximately in. (see Slide-Out Chassis chapter).. Remove electronics cover (see Main Board chapter).. Remove the left and right corner sheet metal panels fastened to the sides of the indoor coil. Left Corner Sheet Metal Panel. Remove screws fastening the ventilation control to the indoor coil top panel.. Remove screws and the indoor coil top panel.. Carefully position the indoor coil to allow access to heater assembly mounting screws.. Remove screws and the heater.. Tag and disconnect wires. 9. Slide the heater out of the right side of the unit. To Test Heaters and Thermal Protectors: Disconnect the heater connector. Measure the resistance of each coil using the following resistance values. Ventilation Control Resistance Heaters Indoor Coil Right Corner Sheet Metal Panel Indoor Coil Top Panel Thermal Protectors Heater Resistance Values When checked at connector When checked at heater Black to White VAC: 0 Ω 0/0 VAC: Ω Upper Coil VAC: 9 Ω 0/0 VAC: 0 Ω Black to Red VAC: Ω 0/0 VAC: Ω Middle Coil VAC: Ω 0/0 VAC: Ω Lower Coil VAC: 0 Ω 0/0 VAC: Ω Check the thermal protectors for continuity between heater connector terminal (black wire) and the black wire to relay RY0. Heater Connector Note: A continuity reading on a thermal protector indicates that the protector is closed at the time of the check only. A faulty thermal protector may open prematurely, resulting in insufficient heating.

27 Indoor Fan and Capacitor The indoor fan is a /0/0 VAC, permanently lubricated motor. Indoor fan speed is selected in the following manner: When the green thermostat wire is connected to the high-speed fan (GH) terminal: DUCT SWITCH UP = HIGH FAN SPEED DUCT SWITCH DOWN = MEDIUM FAN SPEED When the green thermostat wire is connected to the low-speed fan (GL) terminal: DUCT SWITCH UP = MEDIUM FAN SPEED DUCT SWITCH DOWN = LOW FAN SPEED The indoor fan and outdoor fan will operate simultaneously under normal operating conditions. To energize the fans, press the FAN button on the thermostat. When fan ON mode is selected, the fans will run continuously, independent of the compressor or heaters. Selecting AUTO on the thermostat will cause the fans to automatically cycle on and off with the compressor or heaters. The fans will always run when the compressor or heaters are operating. They will start before compressor or heater operation, and will stop after compressor or heater operation has ended. The fans can also be set to run continually, regardless of thermostat setting, by placing the CONST FAN dip switch in the (UP) position (see Dip Switches section of the Features and Operation chapter). The indoor fan capacitor is located under the electronics cover and below the driver board. Indoor Fan Capacitor Outdoor Fan Capacitor To remove the outdoor fan:. Remove the unit from the cabinet (see Slide- Out Chassis chapter).. Remove the left and right divider assemblies.. Remove the electronics cover (see Main Board chapter).. Remove the resistance heaters (see Resistance Heaters chapter).. Remove screw and slide the metal panel from in back of the indoor coil out the right side of the unit.. Loosen the Phillips head setscrew securing the blower wheel. Note: Position blower wheel setscrew on the flat side of the motor shaft when reassembling. Indoor Coil Metal Panel

28 Brace 9. Disconnect CN0 from sub board. 0. Remove screws from the sheet metal panel on top of the fan shroud above the wire retainer.. Remove the metal wire retainer and the wire harness.. Remove screws and the brace above the indoor fan motor.. Disconnect the indoor fan wiring connector (CN0) at the driver board. Screws Wire Retainer Screws Fan Motor Motor Angle Sheet Metal Panel Wire Harness Note: Collars are placed on the fan mounting screws. Use care not to lose collars.. Remove screws, the fan motor, and the motor rubber from the indoor fan motor angle. 9 VAC GY 9 0/0 VAC GY RY0 RY0 CAPACITOR I.D. FAN MOTOR COM LOW HI MED WH RD CN0 CN0 BR RY0 RD CN0 SUB BOARD RY0 DRIVER BOARD MAIN BOARD RY RY0 CN CN0 Indoor Fan Resistance Values 0/0 VAC Models White to black Ω Orange to black 0 Ω White to orange Ω GEA0

29 Indoor Fan Note: Minimum comp./fanoff time is minutes. Fanon may be delayed. Go to Dead Unit troubleshooting. Set thermostat to heat mode or cool mode and adjust temperature set point so that the unit will begin to heat or cool. Does the outdoor fan spin freely? Is the outdoor fan free from obstructions? Remove the obstruction or replace the outdoor fan motor. Do the outdoor fan and compressor fan come on? Replace fan motor. Check indoor fan motor resistance values. Resistance values OK? Indoor Fan Resistance Values 0/0 VAC Models White to black Ω Orange to black 0 Ω White to orange Ω HIGH Before continuing troubleshooting, the fan speed setting must be established: High - Duct dip switch up and green thermostat wire connected to GH terminal. Medium - Duct dip switch down and green thermostat wire connected to GH terminal or Duct dip switch up and green thermostat wire connected to GL terminal. Low - Duct dip switch down and green thermostat wire connected to GL terminal. What speed is fan set to run at? LOW MED Set thermostat to fan run mode. Check for line voltage between CN0 pin and CN0 pin. Set thermostat to fan run mode. Check for line voltage between CN0 pin and CN0 pin. Set thermostat to fan run mode. Check for line voltage between CN0 pin and CN0 pin. Voltage present? Voltage present? Voltage present? Check for VDC on main board CN between pins and 0. Voltage present? Replace capacitor. Check for VDC on main board CN between pins and 0. Voltage present? Replace capacitor. Check for VDC on main board CN between pins 9 and 0. Voltage present? Replace capacitor. Replace main board. Check for 0 VDC on driver board between CN0- and CN 0-0. Replace main board. Replace driver board. Replace main board. Replace driver board. Voltage present? Replace driver board. Replace Sub Board

30 Outdoor Fan and Capacitor The outdoor fan is a single-speed, /0/0 VAC, permanently lubricated motor. The indoor fan and outdoor fan will operate simultaneously under normal operating conditions. However, if the heat pump is operated when high outdoor temperatures are present, the indoor coil may overheat. Should the indoor coil temperature reach F, the main board will shut the outdoor fan off. A F hysteresis loop will restore outdoor fan operation when the indoor coil temperature lowers to F. To energize the fans, press the FAN button on the thermostat. When fan ON mode is selected, the fans will run continuously, independent of the compressor or heaters. Selecting AUTO on the thermostat will cause the fans to automatically cycle on and off with the compressor or heaters. The fans will always run when the compressor or heaters are operating. They will start before compressor or heater operation, and will stop after compressor or heater operation has ended. The fans can also be set to run continually, regardless of thermostat setting, by placing the CONST FAN dip switch in the UP position (see Dip Switches section of the Features and Operation chapter). The outdoor fan capacitor is located under the electronics cover and below the driver board. Indoor Fan Capacitor Outdoor Fan Capacitor To remove the outdoor fan:. Remove the unit from the cabinet (see Slide-Out Chassis chapter).. Remove the left and right divider assemblies (outer sheet metal panels).. Remove screws from the fan shroud.. Remove screws and the brace above the outdoor fan motor.. Disconnect the outdoor fan wiring connector at the drive board.. Remove screws fastening the bottom of the outdoor fan motor angle to the base plate.. Lift the fan shroud, motor angle, and fan motor as an assembly and remove them from the right side of the unit.. Remove the mm nut fastening the fan blade to the motor shaft. 9. Grasp the fan motor shaft with locking pliers. While holding the shaft, turn the fan blade counterclockwise to unscrew the blade from the shaft. Note: Lockwashers are placed between the screw head and fan motor, and between the fan motor and the fan motor angle. 0. Remove screws, lockwashers, and the fan motor from the fan motor angle. Fan Shroud Brace Outdoor Fan Motor Angle

31 9 GR GY 9 GR GY BR CAPACITOR O.D. FAN MOTOR RD SUB BOARD RY0 VAC 0/0 VAC CN0 RY0 RY0 CN0 DRIVER BOARD RY0 CN0 Outdoor Fan Resistance Values 0/0 VAC Models Black to red wires Ω MAIN BOARD CN GEA0 Outdoor Fan Troubleshooting Go to Dead Unit troubleshooting. Note: Minimum comp./ fans-off time is min. Fan-on may be delayed. Set the thermostat to heat mode or cool mode. Adjust the temperature set point so that the unit will begin to heat or cool. Does the indoor fan and compressor come on? Remove the obstruction or replace the outdoor fan motor. Does the outdoor fan spin freely? Is the outdoor fan free from obstructions? Replace main board. Check for VDC at main board between CN- and CN-0. Voltage present? Replace driver board. Set thermostat to fan run mode. Check for line voltage at driver board between CN0-and CN0-. Voltage present? Check resistance values for outdoor fan motor. Resistance OK? Replace fan motor. Replace capacitor. 9

32 Reversing Valve The reversing valve operates on /0/0 VAC and is used to switch the direction of refrigerant flow. The reversing valve controls the direction of the refrigerant flow. When the reversing valve solenoid is energized, it will close the reversing valve and the unit will operate as an air conditioner. When the solenoid is de-energized, the reversing valve will open and the unit will function as a heat pump. To confirm that the reversing valve and reversing valve solenoid are functioning properly, the main board continually monitors the indoor coil thermistor and outdoor coil thermistor. Should the system operate in the reverse of the selected mode due to a reversing valve or reversing valve solenoid malfunction, the board will detect improper thermistor readings, determine that the unit is not operating properly, and terminate compressor operation. Note: Some thermostats can be programmed to energize the reversing valve in heat mode or cool mode. If the thermostat is not programmed correctly, the unit will heat when the thermostat is set to cool and will cool when the thermostat is set to heat. Refer to the instructions provided with the thermostat for thermostat programming procedures. Also refer to the Remote Thermostat Control section of the Features and Operation chapter for more information. To remove the reversing valve solenoid:. Remove the unit from the cabinet (see Slide- Out Chassis chapter).. Remove the electronics cover.. Remove the left divider assembly.. Disconnect the reversing valve solenoid wiring from the driver board.. Remove ( mm) screw and the reversing valve solenoid. Reversing Valve 0

33 9 VAC GR GY 9 0/0 VAC GR GY REV. VALVE SOLEID CN0 SUB BOARD RY0 RY0 RY0 CN0 DRIVER BOARD RY0 CN0 ENERGIZED = AIR CONDITIONER DE-ENERGIZED = HEAT PUMP MAIN BOARD CN Reversing Valve Coil Resistance Value = 00Ω Reversing Valve Troubleshooting GEA0 Note: Minimum compressor/fans-off time is minutes. Set thermostat to cool mode. Adjust the temperature set point to a setting below room temperature. Check for line voltage on driver board at CN0 between pins and. Voltage present? Replace main board. Check for VDC on main board at CN between pins and 0? Voltage present? Feel the lines going to the indoor coil. Do lines feel warm or cold? WARM Suspect a faulty valve coil. COLD Replace driver board. Reversing valve is operating properly. WARM Note: Minimum compressor/fans-off time is minutes. Heat pump models will utilize electric resistance heaters for initial heat mode startup. Once the thermostat set point is attained, the unit will cycle off and automatically switch to heat pump operation on subsequent cycles, unless the outdoor temperature is less than F. Set the thermostat to heat mode. Adjust the temperature set point to a setting above room temperature. When compressor comes on, feel the lines going to the indoor coil. COLD Suspect a faulty valve coil. Do lines feel warm or cold?

34 Transformer The transformer is located under the electronics cover and below the driver board. The transformer provides low voltage power to the main board, driver board and thermostat. To test the transformer: Verify line voltage is present at CN0 on sub board. If line voltage is not present, suspect building supply voltage, blown (open) fuse, a faulty sub board or a faulty driver board. If line voltage is present, use the following chart to check the voltage output and resistance values. If values are not correct, replace the transformer. Driver Board 0/0 VAC Transformer Voltage and Resistance Values Transformer 0/0 VAC version shown Measure Across Black to Black Yellow to Yellow White to White Voltage Output Resistance Line in 0 Ω VAC. 0 Ω VAC. Ω 9 GY 9 GY BR RY0 CN0 SW0 SUB BOARD VAC 0/0 VAC RY0 RY0 FUSE ( amp) RD CN0 CN0 CN0 YL YL DRIVER BOARD MAIN BOARD THERMISTORS ROOM AIR SENSOR TR MOTION SENSOR DOOR SWITCH WH WH CDC SWITCH THERMOSTAT GEA0

35 Thermistors The main control board uses input from thermistors. These thermistors are located on the indoor coil, outdoor coil, and outdoor fan shroud. The main control board monitors the thermistors to determine the temperature in these areas and uses this information to make operating decisions. For the optional room air sensor (kit), see the Room Air Sensor section in the Features and Operation chapter. Thermistor Resistance (Ohms) Temperature Indoor Coil Outdoor Coil Outdoor Air 0 F F F F F INDOOR COIL THERMISTOR INDOOR THERMISTOR OUTDOOR COIL THERMISTOR OUTDOOR THERMISTOR OUTDOOR AIR THERMISTOR OUTSIDE THERMISTOR MAIN BOARD CN 90 F GEA0 Thermostatic Drain Valve During the cooling season, the thermostatic drain valve remains closed to allow water to accumulate in the base pan. The water is then picked up by the outdoor fan blade and blown into the condenser, providing more efficient cooling. During heat pump season the thermostatic drain opens to allow water to drain from the base pan prior to freezing. This prevents the outdoor fan blade from scraping against ice that could freeze in the bottom of the base pan. The thermostatic drain valve is operated by a selfcontained thermostat. The thermostat begins to open the drain valve at approximately F and will be fully open at approximately F. To remove the thermostatic drain valve:. Remove the unit from the cabinet (see Slide- Out Chassis chapter).. Remove the left divider assembly.. Remove screws and the thermostatic drain valve.

36 Dead Unit Troubleshooting Check the ON/ OFF switch to be sure it is on. Is the thermostat illuminated? Check for VAC at main board terminal strip (CN) between green fan wire (terminal 0 or ) and common wire (terminal ). Voltage present? Replace the fuse. Check the fuse. Fuse OK? Open green wire or faulty thermostat. Check for line voltage on sub board at CN0 between pins and. Voltage present? Check for 0 VDC at sub board connector CN0- to CN0-. Check for 0 VDC at driver board CN0- and CN0-. Voltage present? Check for 0 VDC at driver board CN0- to CN0-. Replace transformer. Voltage present? Open ON/OFF switch or open sub board. Voltage present? Replace sub board. Check building supply voltage and power cord. Check for line voltage between terminals and at power cord connector. Voltage present? Check for VAC at main board CN- to CN-. Voltage present? Replace thermostat. Check for VDC at main board CN- to CN-0. Voltage present? Check brown wire between driver board and RY0 (sub board) for an open. If OK, replace driver board. Check for line voltage between driver board CN0- and the brown wire at RY0. Voltage present? Replace transformer. Replace main board. Replace driver board Replace sub board.

37 Notes

38 Schematic (Heat Pump Models) Schematics and Wiring Diagrams Tandem Amp. Perpendicular 0 Amp. Large Tandem 0 Amp. WH WH WH GY RD GY GR RD GR GY RD GR GEA0 Overload is internal to compressor on 000 BTU model. UNIVERSAL CONNECTOR FAN MOTOR CAPACITOR FAN MOTOR CAPACITOR O. L. P. C COMP. MOTOR S R RUNNING CAPACITOR Varistor HEATER UNIT HEATER RY0 HEATER FUSE (FU0) (NR0) HEATER PROTECTOR RY0 FUSE T CURRENT DETECTOR (CT) RY0 Capacitor (C0, C0) OUTDOOR FAN MOTOR CN0 CN RY0 INDOOR FAN MOTOR CN0 RY0 RY0 * REVERSE VALVE SOL. * CN0 * RY0 CN0 RY0 CN0 RY0 CN0 TRANSFORMER (TR) DRIVE BOARD UNIT REGULATOR CN0 CN0 CN0 SWITH FOR DISCONNECT REMOTE T' STAT CDC MOTION SENSOR DOOR SWITCH ROOM ID. COIL OD. COIL OUTDOOR CN CN (for setting) DIP SW INTERFACE MAIN BOARD UNIT CONTROL CIRCUIT CN CN0 * RY0 RY0 RY0 RY0 RY0 RY0 RY0 CN0 CN0 RY0 RY0 SUB BOARD UNIT RY0 CN

39 Wiring Diagram (Heat Pump Models) Tandem Amp. Perpendicular 0 Amp. Large Tandem 0 Amp. WH WH WH GY RD GY GR RD GR GY RD GR GEA0 WIRING DIAGRAM 9 9 BR GY RD GR WH OR (V) (0/0V) O.L.P. CN ID. COIL OR OR TRANSFORMER WH OUTDOOR * CN MAIN BOARD UNIT CN WH OD. COIL * SWITCH FOR DISCONNECT YL YL CN CN0 CN0 CN0 CN0 CN0 RY0 RY0 DRIVE BOARD UNIT CN0 CN0 SUB BOARD UNIT CN NR0 VARISTOR CN0 CN0 RY0 RD WH RY0 CN0* REV. RV VALVE SOLE. * OD. FAN MOTOR RD FM GY T BR CN0 RD CN0 OR RD WH BR YL RUNNING CAPACITOR FM RUNNING CAPACITOR ID. FAN MOTOR WH RD WH RD RUNNING CAPACITOR COLOR : ACK : UE BR : BROWN GR : GREEN GY : GRAY OR : ORANGE RD : RED WH : WHITE YL : YELLOW *: ONLY AZH SERIES WH TL (C) (Temp. Limit -Cool) TL (C) (Temp Limit -Cool) S C CM RD COMPRESSOR R HEATER UNIT HEATER HEATER HEATER PROTECTOR FUSE Overload is internal to compressor on 000 BTU model.

40 Schematic (Electric Resistance Heat Models) Tandem Amp. Perpendicular 0 Amp. Large Tandem 0 Amp. WH WH WH GY RD GY GR RD GR GY RD GR GEA0 Overload is internal to compressor on 000 BTU model UNIVERSAL CONNECTOR FAN MOTOR CAPACITOR FAN MOTOR CAPACITOR O. L. P. C COMP. MOTOR S R RUNNING CAPACITOR Varistor HEATER UNIT HEATER RY0 HEATER FUSE (FU0) (NR0) HEATER PROTECTOR RY0 FUSE T CURRENT DETECTOR (CT) RY0 Capacitor (C0, C0) OUTDOOR FAN MOTOR CN0 CN RY0 INDOOR FAN MOTOR CN0 RY0 RY0 * REVERSE VALVE SOL. * CN0 * RY0 CN0 RY0 CN0 RY0 CN0 TRANSFORMER (TR) DRIVE BOARD UNIT REGULATOR CN0 CN0 CN0 SWITH FOR DISCONNECT REMOTE T' STAT CDC MOTION SENSOR DOOR SWITCH ROOM ID. COIL OD. COIL OUTDOOR CN CN (for setting) DIP SW INTERFACE MAIN BOARD UNIT CONTROL CIRCUIT CN CN0 * RY0 RY0 RY0 RY0 RY0 RY0 RY0 CN0 CN0 RY0 RY0 SUB BOARD UNIT RY0 CN

41 Wiring Diagram (Electric Resistance Heat Models) Tandem Amp. Perpendicular 0 Amp. Large Tandem 0 Amp. WH WH WH GY RD GY GR RD GR GY RD GR GEA0 9 9 BR GY RD GR WH OR (V) (0/0V) O.L.P. CN ID. COIL OR OR TRANSFORMER WH OUTDOOR * CN MAIN BOARD UNIT CN WH OD. COIL * SWITCH FOR DISCONNECT YL YL CN CN0 CN0 CN0 CN0 CN0 RY0 RY0 DRIVE BOARD UNIT CN0 CN0 SUB BOARD UNIT CN NR0 VARISTOR CN0 CN0 RY0 RD WH RY0 CN0* REV. RV VALVE SOLE. * OD. FAN MOTOR RD FM GY T BR CN0 RD CN0 OR RD WH BR YL RUNNING CAPACITOR FM RUNNING CAPACITOR ID. FAN MOTOR WH RD WH RD RUNNING CAPACITOR COLOR : ACK : UE BR : BROWN GR : GREEN GY : GRAY OR : ORANGE RD : RED WH : WHITE YL : YELLOW *: ONLY AZH SERIES WH CM TL (C) (Temp. Limit -Cool) Overload is internal to TL compressor (C) (Temp. on Limit 000 -Cool) BTU model TL (C) (Temp. Limit -Cool) S C RD COMPRESSOR R HEATER UNIT HEATER HEATER HEATER PROTECTOR FUSE 9

42 Component Locator Views Outdoor Thermistor Ventilation Control Indoor Fan Motor Reversing Valve Reversing Valve Solenoid Outdoor Coil Thermistor Indoor Coil Thermistor Thermostatic Drain Valve 0

43 Power Cord Connector Resistance Heater Connector Accumulator Relay and Overload Cover Outdoor Fan Motor Compressor Indoor Coil Outdoor Coil

44 Main Board Sub Board Compressor Capacitor Driver Board Power Cord Connector Fuse Transformer Indoor Fan Capacitor Outdoor Fan Capacitor

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