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
90 PB
TROUBLESHOOTING
Unit Does Not Operate
Disconnect Dis play
Connector CN6 on
top of Main PCB
Set multi meter do
read low voltage DC
and pl ace Mult i
Meter leads on pins
3 and 7.
Is Fluctuating
0-6Vdc Present?
Set multimeter to
read continuity.
Check all wires on
display boar d
conne ct or c ab le to
CN6 plug for pin to
pin continuity.
Are any wi re s
showing open
(OL)?
Replace Dis play
Boa rd
Replace Connector
cabl e
Che ck all wi r ing an d
comms cable
conne ct or s from
Mai n PCB to the
Power PCB
Ensure all
conne ct or s are
undama ged, ful ly
connected and fully
engaged.
Fix any issues
Refere nc e wiring di agr am (figure 801)
Main PCB Diagram (Figure 7xx)
Power P CB Di agra m (Figure (7 xx )
Any loose,
damaged, or
disconnected
conne ct or s?
Is Fluctuating
0-6Vd c Pre sent?
NO YES
YES
YES
END PROCESS YES
No
Continue
troubleshooting on
next page
No
NO
Figure 713