Appendix A: Remote Thermostat Wiring - Friedrich WallMaster PTAC Installation & Operation Manual

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.
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.
TERMINAL LETTER
Y
W
G
C
R
B (Heat Pump units Only)
For Non-Heat Pump equipped units: A single stage cooling and heating thermostat is required. Terminal "G" should be
energized whenever a call for heating or cooling is made. Typically a heat/cool thermostat designed for use with electric heat
systems will meet this requirement.
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.
920-087-02 (9-03)
Honeywell Thermostat Terminal Designation:
OPERATION
Cooling
Heating
Fan
Common Terminal
24 V to the thermostat
Reversing Valve
Simplified Wiring Example
Unit Terminal Board
* A-Suffix models do not have a "C" terminal
Thermostat Terminals
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.
CONTACT MADE
During call for cooling.
During call for heating.
Continuous if the slider is in the "Fan" position, otherwise, intermittent.
For thermostats requiring a common terminal
Directly from the transformer
Made continuously during call for heating.
Typical PTAC/PTHP unit
Used for PTHP only
Wall thermostat
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