17
920-087-02 (9-03)
Typical PTAC/PTHP unit
Used for PTHP only
Wall thermostat
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.
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.
Unit Terminal Board
* A-Sufx models do not have a "C" terminal
Simplied Wiring Example
Thermostat Terminals
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.
Honeywell Thermostat Terminal Designation:
Appendix A: Remote Thermostat Unit Installation
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.
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.
