Service and Parts Manual (2016, 2017, 2018, 2014, 2015, 2013, 2012)
Table Of Contents
- INTRODUCTION
- IMPORTANT SAFETY INFORMATION
- PERSONAL INJURY OR DEATH HAZARDS
- Operation of Equipment in During Construction
- Equipment Identification
- Model and Serial Number Location
- Model and Serial Number information is found on the Manufacturer’s DATA TAG, located on the front or top.
- Model Number Reference Guide
- SERIAL NUMBER REFERENCE GUIDE
- Chassis Specifications
- Small Chassis Dimensions
- Large Chassis Dimensions
- Electrical Data
- Electrical Requirements
- Electrical Ratings Table
- Supply Air Flow and Data
- ELECTRONIC CONTROL BOARD FEATURES
- Electronic Sequence of Operation
- Interface Connector Definitions
- Remote Wall Thermostat
- Remote Wall Thermostat Location
- Desk Control
- Auxiliary Fan Control
- Unit Heat Control Operation - Heat Pump With Electric Heat
- Refrigeration Sequence Of Operation
- Remove The Chassis
- Servicing / Chassis Quick Changeouts
- To Remove the Chassis from the Closet:
- Refrigerant Charging
- Undercharged Refrigerant Systems
- Overcharged Refrigerant Systems
- Restricted Refrigerant System
- Sealed System Method of Charging/ Repairs
- Checking External Static Pressure
- Explanation of charts
- Indoor Airflow Data
- Ductwork Preparation
- Fresh Air Door
- Checking Approximate Airflow
- Electric Heat Strips
- COMPONENT TESTING
- 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 -Special Procedure in Case of Compressor Burnout
- Fan Motor
- Capacitors
- Heating Element and Limit Switch
- Drain Pan Valve
- Thermistor Resistence Values (This Table Applies to All Thermistors)
- Testing the Diagnostic Service Module
- Testing the Electronic Control Board
- ELECTRONIC CONTROL BOARD COMPONENTS IDENTIFICATION AND TESTING
- Error Codes and Alarm Status
- Electrical Troubleshooting Chart - Cooling
- 9K Btu, 12K Btu, & 18K Btu
- 24K Btu
- Electrical Troubleshooting Chart - Heat Pump
- Troubleshooting Chart - Cooling
- 9-18K VEA 208/230V
- 9-18K VHA 208/230V
- 9-18K VHA 265V
- 24K VEA 208/230V 2.5/3.4/5.0
- 24K VEA 208/230V 7.5/10.0
- 24K VHA 208/230V 2.5/3.4/5.0
- 24K VHA 208/230V 7.5/10
- 24K VHA 265V 2.5/3.4/5.0
- 24K VHA 265V 7.5/10.0
- VEA9K, VHA9K, VEA12K, VHA12K, VEA18K Figure 901
- AVAILABLE ACCESSORIES
- Thermostat - Rt6
- Thermostat - Rt6p
- Thermostat - WRT1
- Drain Pan
20 PB
Note: Unit is operated by a wired remote wall t-stat which is connected to an electronic control board at the VPAK unit.
Operation
Electronic Sequence of Operation
Compressor and Reversing Valve Control
Active Mode Compressor Reversing Valve
Cooling On De-Energized
Heat - Pump On Energized
Heat - Electric Off
Fan Only Off
Reversing Valve
The reversing valve stays in the last state until a call for heat or cooling.
The reversing valve only changes when required to provide coooling or heat pump. Leave the reversing valve in it’s last state
until it’s required to change.
Unit Cooling Mode
Once the ambient temperature rises past the cool demand set point of the t-stat (see gure below), and the compressor is
not locked out, the cooling cycle begins. As shown in the gure below, the fan is started 5 seconds prior to the compressor.
Once the ambient temperature has been lowered to the cool set point, the cooling cycle starts to terminate by shutting off
the compressor. After a 30 seconds delay, the fan is shut off.
Heating Mode Control Operation
There are two heating methods: Heat Pump and Electric Resistance Heat.
There are 2 Types of units that provide heating:
Cool / Heat Pump with Electric Heat and Cool with Electric heat.
Heat Mode in Cool with Electric Heat Units
When the t-stat is in the Heat Mode, if the indoor ambient temperature is below the heat set point, the fan turns on 5
seconds prior then the electric heat will turn on. When the t-stat is satised, the electric heat will turn off. The fan turns off
15 seconds later.
Heat Pump With Electric Heat Operation
This heating has two heating methods. If the ambient indoor temperature is below the heat set point and the compressor is
not locked out, the compressor turns on. If the ambient temperature rises above the t-stat’s heat set point, the compressor
turns off.
If the Compressor is Locked Out on the 3 Minute Time Delay and Electric Heat is Available
1. The control turns on the electric heat until the compressor is not locked out.
2. After lockout, the control turns off the electric heat, waits 5 seconds, then turns on the compressor. (The wired
remote wall t-stat’s time delay may override this feature).
Condition 1
If the outdoor coil temperature sensor drops to 30 degrees F for less than 2 consecutive minutes, the unit will switch to
electric heat if available. Thereafter, the unit will switch back to Heat Pump heat until the outdoor coil temperature sensor
rises to 45 degrees F or greater.
Figure 341 (Compressor Operation)