Friedrich Heat Pump 920-087-09 User Manual download pdf (Page 27)

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 PD 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.

FRP029

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.

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Friedrich Heat Pump 920-087-09 User Manual Page 27

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