Appendix A: Remote Thermostat Unit Installation
Remote Thermostat Selection & Wiring Guidelines for Packaged Terminal Air Conditioners
Follow the instructions and recommendations of the thermostat manufacturer for installation and wiring. Do not use a conventional heat pump thermostat with emergency electric heat selection for our heat pump units. Our units make an automatic decision about turning on electric heat if the heating demand cannot be met by the heat pump due to low outdoor temperatures.
Manual Changeover Thermostat
For Heat Pump equipped units: A single stage, heat/cool thermostat with a terminal for a reversing valve operation is required. Terminal "B" should be continuously energized in the heat mode and terminal "G" should be energized whenever there is a call for heating or cooling. Typically, a heat/cool thermostat designed for use with electric heat systems will meet the above requirements.
NOTE: This unit is designed for use with a single stage thermostat only. Improper application of the thermostat may result in property damage, personal injury or death.
Honeywell Thermostat Terminal Designation:
TERMINAL LETTER | OPERATION | CONTACT MADE |
Y | Cooling | During call for cooling. |
W | Heating | During call for heating. |
G | Fan | Continuous if the slider is in the "Fan" position, otherwise, intermittent. |
C | Common Terminal | For thermostats requiring a common terminal |
R | 24 V to the thermostat | Directly from the transformer |
B (Heat Pump units Only) | Reversing Valve | Made continuously during call for heating. |
For
Simplified Wiring Example
Unit Terminal Board
* A-Suffix models do not have a "C" terminal
Typical PTAC/PTHP unit
Used for PTHP only
Wall thermostat
Thermostat Terminals
NOTE: It is the installer's responsibility to ensure that all control wiring connections are made in accordance with the installation instructions. Improper connection of the thermostat control wiring and/or tampering with the unit's internal wiring can void the equipment warranty and may result in property damage, personal injury or death. Other manufacturer's PTACs and even older Friedrich models may have different control wire connections. Questions concerning proper connections to the unit should be directed to the factory.
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