Service and Parts Manual (2016, 2017, 2018, 2019, 2020, 2021, 2022)

75 PB
26
Desk Control Terminals
The Friedrich PD model PTAC has built-in provisions for connection to an
external switch to control power to the unit. The switch can be a central
desk control system or even a normally open door switch.
For desk control operation connect one side of the switch to the D1 terminal
and the other to the D2 terminal (See Figure 31, Page 23). Whenever the
switch closes the unit operation will stop.
NOTE: The desk control system and switches must be eld supplied.
Energy Management
Sometimes known as Front Desk Control, an input is provided so that the
unit can be manually disabled from a remote location. If the unit detects
24Vac on this input, it will automatically turn itself off. If no voltage is
detected on the input , the unit will run normally.
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. 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 Friedrich.
WARNING
Electrical Shock Hazard
Turn off electrical power before service
or installation.
ALL electrical connections and wiring
MUST be installed by a qualified
electrician and conform to the National
Code and all local codes which have
jurisdiction.
Improper connection of the thermostat
control wiring and/or tampering with the
units internal wiring may result in property
damage, personal injury or death.
INSTALLATION
Thermostat