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
34 PB
External Static Pressure can best be described as the pressure difference (drop) between the Positive Pressure (discharge)
and the Negative Pressure (intake) sides of the blower. External Static Pressure is developed by the blower as a result of
resistance to airow (Friction) in the air distribution system EXTERNAL to the VERT-I-PAK cabinet.
Resistance applied externally to the VERT-I-PAK (i.e. duct work, lters, etc.) on either the supply or return side of the system
causes an INCREASE in External Static Pressure accompanied by a REDUCTION in airow.
External Static Pressure is affected by two factors.
1.Resistance
2.Blower Speed (Changing to a higher or lower blower speed will raise or lower the External Static Pressure accord
ingly).
These affects must be understood and taken into consideration when checking External Static Pressure/Air ow to insure that
the system is operating within design conditions.
Operating a system with insufcient or excessive airow can cause a variety of different operating problems. Among these are
problems such as, reduced capacity, freezing evaporator coils, premature compressor’ heating component failures, and/ or
other air local distribution issues..
System airow should always be veried upon completion of a new installation, or before a change-out, compressor
replacement, or in the case of heat strip failure to insure that the failure was not caused by improper airow.
Checking External Static Pressure
The airow through the unit can be determined by measuring the external static pressure of the system, and consulting the
blower performance data for the specic VERT-I-PAK.
1. Set up to measure external static pressure at the supply and return air.
2. Ensure the coil and lter are clean, and that all the registers are open.
3. Determine the external static pressure with the blower operating.
Use an incline or dual port manometer to measure. Measurement should be taken roughly 3-6” from the Vert-I-Pak
collar and the center of the indoor coil with the lter installed.
4. Refer to the Air Flow Data for your VERT-I-PAK system to nd the actual airow for factory-selected fan speeds.
5. If the actual air ow is either too high or too low, the blower speed will need to be changed to appropriate setting
or the ductwork will need to be reassessed and corrections made as required.
6. Select a speed, which most closely provides the required airow for the system.
7. Recheck the external static pressure with the new speed. External static pressure (and actual airow) will have
changed to a higher or lower value depending upon speed selected. Recheck the actual airow (at this “new” static
pressure) to conrm speed selection.
8. Repeat steps 8 and 9 (if necessary) until proper air ow has been obtained.
EXAMPLE: Airow requirements are calculated as follows: (Having a wet coil creates additional resistance to airow. This
additional resistance must be taken into consideration to obtain accurate airow information.
Figure 604
EXTERNAL STATIC PRESSURE