Remington REM-05-240-GH Service Manual download pdf (Page 12)

REMOTE THERMOSTAT AND LOW VOLTAGE

CONTROL CONNECTIONS

Room Thermostats

Room thermostats are available from several different

manufacturers in a wide variety of styles. They range from

the very simple Bimetallic type to the complex electronic set-

back type. In all cases, no matter how simple or complex,

they are simply a switch (or series of switches) designed to

turn equipment (or components) “ON” or “OFF” at the desired

conditions.

An improperly operating, or poorly located room thermostat

can be the source of perceived equipment problems. A careful

check of the thermostat and wiring must be made then to

insure that it is not the source of problems.

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 single stage 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.

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 single stage,

heat/cool thermostat designed for use with electric heat

systems will meet the above requirements.

To control the unit with a wall mounted thermostat follow

the steps below:

1) With the front cover removed locate the low voltage

terminal strip at the lower portion of the Smart Center.

2) Remove the jumper between the ‘GL’ and GH’

terminals.

3) The control is now congured for control by a wall

thermostat. The Smart Center will no longer control the

unit.

4) If desired the accessory escutcheon kit (PDXRT) is to

be used, install it over the existing control panel

Note: To revert back to the Smart Center control of the unit

replace the jumper wire between the ‘GL’ and ‘GH’ terminals

that was removed in step 1.

Remote Thermostat Control

Heat Pump with Electric Heat Operation

When there is a call for heat from the wall thermostat the

control board will receive signals on terminals W, B, GL or

GH. During compressor lock-out time, the electric heat will

turn on rst. When the compressor lock-out time is up, the

compressor will turn on. If the outdoor coil temperature sensor

drops to 30° F or less for 2 consecutive minutes then the unit

will switch to electric heat.

Location

The thermostat should not be mounted where it may be

affected by drafts, discharge air from registers (hot or

cold), or heat radiated from the sun or appliances.

The thermostat should be located about 5 Ft. above the

oor in an area of average temperature, with good air

circulation. Close proximity to the return air grille is the

best choice.

Mercury bulb type thermostats MUST be level to control

temperature accurately to the desired set-point. Electronic

digital type thermostats SHOULD be level for aesthetics.

Thermostat Connections

C = Common Ground

W = Call for Heating

Y = Call for Cooling

R = 24V Power from Unit

GL = Call for Low Fan

GH = Call for High Fan

B = Reversing Valve Energized in heating mode

(PDH Models Only)

*If only one G terminal is present on thermostat connect to

GL for low fan or to GH for high fan operation.

NOTE: It is the installer’s responsibility to ensure that all

control wiring connectiions are made in accordance with

the Friedrich installation instructions. Improper connection

of the thermostat control wiring and/or tampering with the

unit’s internal wiring can void the equipment warranty.

Questions concerning proper connections to the unit

should be directed to the factory: 210-357-4400.

Thereafter, the unit will switch back to heat pump heat if the

outdoor coil temperature sensor rises to 45’ F or greater.

Thermostat Location

Manual Changeover Thermostat

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Remington REM-05-240-GH Service Manual Page 12

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