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
20 PB
OPERATION
Function and Control
Relationship Between Inputs and Output by 24V Wall Thermostat
INPUTS OUTPUT
FreshAire Mode "24V wall
Thermostat"
In Demand No Demand
Enable Continuous "ID Fan
Speed Selec-
tion"
ID Fan Opera-
tion
"Fresh-Air Fan
Operation"
ID Fan Opera-
tion
"Fresh-Air Fan
Operation"
YES NO High High ON High ON
low low low
Auto Auto OFF OFF
YES High High High O N
low low low
Auto Auto low
NO NO High High OFF High OFF
low low low
Auto Auto OFF
YES High High High
low low low
Auto Auto OFF
Relationship Between Inputs and Output by 12V Wall Thermostat
INPUTS OUTPUT
FreshAire Mode "12V wall
Thermostat"
In Demand No Demand
Enable Continuous "ID Fan
Speed Selec-
tion"
ID Fan Opera-
tion
"Fresh-Air Fan
Operation"
ID Fan Opera-
tion
"Fresh-Air Fan
Operation"
YES NO High High ON High ON
low low low
Auto Low OFF OFF
YES High High High ON
low low low
Auto Low low
NO NO High High OFF High OFF
low low low
Auto Low OFF
YES High High High
low low low
Auto Low OFF