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

74 PB
25
Remote Control Thermostat
Installation
Install Thermostat
1. Approximately 5 ft. from the oor.
2. Close to or in a frequently used room, preferably on an inside wall.
3. On a section of wall without pipes or ductwork.
The Thermostat should NOT be mounted:
1. Close to a window, on an outside wall, or next to a door leading
outside.
2. Where it can be exposed to direct sunlight or heat, such as the sun,
a lamp, replace, or any ther temperatureradiating object which
may cause a false reading.
3. Close to or in the direct airow of supply registers and/or return
air grilles.
4. Any areas with poor air circulation, such as a corner, behind a
door, or an alcove.
Remote Thermostat and Low
Voltage Control Connections
Remote Thermostat
All Friedrich PZ model PTAC units are factory congured to be controlled
by either the chassis mounted Smart Center or a 24V remote wall mounted
thermostat. The thermostat may be auto or manual changeover as long as
the control conguration matches that of the PTAC unit.
NOTE: All PDE models require a single stage cool, single stage heat
thermostat. All PDH models require a single stage cool, dual
stage heat thermostat with an O reversing valve control. The
Friedrich RT6 thermostat can be congured for either model.
Figure 33
Control board with optional PDXRT escutcheon kit installed
To control the unit with a wall mounted thermostat
follow the steps below:
1. Unplug the unit before doing any work.
2. With the front cover removed locate the dip switches located below
the Smart Center control panel. See page 23. Switch Dip switch
2 to the up on 'ON' position.
3. Remove the low voltage terminal block from the unit.
4. Connect the corresponding terminals from the wall thermostat to
the terminal block.
5. Replace the terminal block on the unit.
6. Restore power to the unit.
7. The unit is now controlled by the wall thermostat only.
8. If the accessory escutcheon kit (PDXRTA) is to be used, install it
over the existing control panel.
NOTE: The unit mounted controls no longer control the unit. To restore
the unit mounted controls move dip switch 2 to the down or
'OFF' position.
Thermostat Connections
R = 24V Power from Unit
Y = Call for Cooling
W = Call for Heating
O = Reversing Valve Energized in cooling mode (PDH Models Only)
GL = Call for Low Fan
GH = Call for High Fan
C = Common Ground
*If only one G terminal is present on thermostat connect to GL for low
speed fan or to GH for high speed fan operation.
INSTALLATION
Thermostat