Service and Parts Manual (2018, 2019, 2020, 2021, 2022)
Table Of Contents
- INTRODUCTION
- Important Safety Information
- Personal Injury Or Death Hazards
- Operation of Equipment in During Construction
- Typical Unit Components and Dimensions
- Model Number Reference Guide
- Serial Number Reference Guide
- Product Features
- General Specifications 9-12k Heat Pump Models
- Electrical Data
- Function and Control
- Buttons and Display
- Temperature Definition
- System Basic Function
- 1) Cooling Mode
- 2) Heating Mode
- 3) Room Freeze Protection (AUTO HEATING)
- 4) Temperature Sensor Open Circuit or Short Circuit Protection
- 5) Power cut protection
- 6) Compressor and DC-inverter features
- 7) Smart fresh air system
- Advanced Functions
- Advanced Settings
- Memory Function
- FD Control (front-desk control) & 24V REMOTE THERMOSTAT
- Protection Functions
- System Configuration Fresh Air Vent Control
- Digital Control User Input Configuration
- Settings- Detailed Configurations
- Refrigeration Sequence Of Operation
- Refrigerant System Diagram
- PTAC Installation Recommendations
- Wall Sleeve Installation Instructions (PDXWS)
- Alternate Wall Installations
- PXDR10 Drain Kit Installation
- External Drain
- PXGA Standard Grille
- Chassis Install
- Remote Control Thermostat Installation
- Front Desk Control Terminal
- Final Inspection & Start-up Checklist
- Remove Chassis
- Remove User Interface
- Open Electrical Control Box
- Remove Main PCB (logic) Board
- Remove Power Cord
- Remove Power PCB
- Remove IPM PCB (Inverter Board)
- Remove Blower Wheel (Inside Fan)
- Remove Blower Wheel Motor (Inside Fan)
- Remove Heating Element
- Remove Freshaire Components
- Remove Outdoor Fan
- Remove Reversing valve Solenoid
- Refrigerant Charging
- Undercharged Refrigerant Systems
- Overcharged Refrigerant Systems
- Restricted Refrigerant System
- Sealed System Method of Charging/ Repairs
- Hermetic Components Check
- Reversing Valve Description And Operation
- Testing The Reversing Valve Solenoid Coil
- Checking The Reversing Valve
- Touch Test Chart : To Service Reversing Valves
- Compressor Checks
- Compressor Replacement
- Compressor Replacement -Special Procedure in Case of Compressor Burnout
- Check Indoor Fan Motor
- Check Outdoor Fan Motor
- Check Fan Motor Capacitors
- Main PCB (logic) Board Connector Identification
- Power PCB (Power Board) Connector Identification
- Basic Troubleshooting
- Error code and solutions
- Unit Does Not Operate
- Check Electric Heater Control
- Check Thermistors
- Check Thermistors -Resistance Table of Thermistors (5K)
- Check Thermistors -Resistance Table of Thermistors (50K)(Compressor Discharge Sensor)
- PARTS CATALOG
88 PB
TROUBLESHOOTING
Error code and solutions
Figure 712
ERROR CODE Meaning Solutions Click link for
reference
P2 IPM Over Heat or Over
Current Protection
envoked
Check for low air flow or no air flow due to evaporator or con-
denser coil bloked with debris.
Evap/Cond motor fan motor compromised, fan Capacitors com-
promised, blower wheel/fan blade compromised.
Check Dip Switch SW2 on Main Board is correct for the BTU of
the unit model.
Check Compressor wiring is properly connected, Check compres-
sor for Short/Ground, Check IPM PCB.
See Operation
section for details
on dip switches.
Check indor fan
motor
Check oudoor fan
motor
Check Fan
Capacitors
Check
Compressor
Check IPM PCB
P4 Compressor Discahrge
Over Heat Protection
envoked
Check for low air flow or no air flow due to evaporator or con-
denser coil bloked with debris.
Evap/Cond motor fan motor compromised, Fan Capacitors com-
promised, blower wheel/fan blade compromised.
Check Dip Switch SW2 on Main Board is correct for the BTU of
the unit model
Check Compressor wiring is properly connected, Check compres-
sor for Short/Ground, Check IPM Board,
See Operation
section for details
on dip switches.
Check indor fan
motor
Check oudoor fan
motor
Check Fan
Capacitors
heck Compressor
Check IPM PCB
P7 DC Over/Under Supply
Power Voltage Protec-
tion envoked
Check for low air flow or no air flow due to evaporator or conden-
sor coil blocked with debris.
Indoor blower/ outdor fan comprimised, fan capacitors compri-
mised. Blower wheel/ fan blade comprimised.
Check dip switch SW2 on main pcb is correct for the BTU of the
model.
Check compressor wiring is properly connected. Check compres-
sor for short. Check IPM PCB.
Check Power Supply is within the required power supply toler-
ances of +/- 10%
Check and monitor power supply stability and ensure proper NEC
code grounding at the main breaker and power supply.
See Unit does not
Operate
Check indor fan
motor
Check oudoor fan
motor
Check Fan
Capacitors
Check
Compressor
Check IPM PCB