Friedrich Metal Products RT2 Installation Manual

Installation Instructions

SINGLE STAGE HEAT/COOL THERMOSTAT

Please read these instructions completely before attempting installation.

WARNING

Before installing thermostat, turn off all power
to unit. There may be more than one power
disconnect. Electrical shock can cause per­sonal injury or death.

Improper wiring or installation may damage
thermostat. Wiring must conform to local and
national electrical codes.

0.8

Selects System Mode:
OFF. HEAT, or COOL

4.55

Turns Continuous Fan
On or OFF

Model RT2

Increase
Temperature

Decrease
Temperature

3.30

INSTALLATION CONSIDERATIONS

The thermostat is a wall mounted, low-voltage thermostat,
which maintains room temperature by controlling the opera­tion of a heating and air conditioning system. Batteries are
not required; temperature and mode settings are preserved
with the power off.

I. THERMOSTAT LOCATION

Thermostat should be mounted:

- Approximately 5 ft. (1.5m) from fl oor.

- Close to or in a frequently used room, preferably on an
inside partitioning wall.

- On a section of wall without pipes or duct work.

Thermostat should NOT be mounted:

- Close to a window, on an outside wall, or next to a door
leading to the outside.

- Exposed to direct light and heat from a lamp, sun,
fi replace, or other temperature-radiating object which
may cause a false reading.

- Close to or in direct airfl ow from supply registers and
return-air grilles.

- In areas with poor air circulation, (behind a door or in
an alcove.)

II. INSTALL THERMOSTAT

1. Turn off all power to unit.

2. If an existing thermostat is being replaced:
A. Remove existing thermostat from wall.

B. Disconnect wires from existing thermostat, one at

a time. Be careful not to allow wires to fall back into
the wall.

C. As each wire is disconnected, record wire color and

terminal marking.

D. Discard or recycle old thermostat.

NOTE: Mercury is a hazardous waste and MUST be
disposed of properly.

3. Separate the thermostat and back plate.

4. Route thermostat wires through hole in back plate. Level

back plate against wall (for aesthetic value only - thermo­stat need not be leveled for proper operation) and mark
wall through 2 mounting holes.

920-162-01 (5-05)

5. Drill two 3/16-in. mounting holes in wall where marked.

2

(Note: Mounting holes on back plate are designed to fi t on a
horizontal J-box).

1.587

2.375

2.625

3.275

6. Secure back plate to wall with 2 anchors and screws provid­ed making sure all wires extend through hole in back plate.

7. Connect wires to proper terminal of the connector block

8. Push any excess wire back into wall. Excess wire inside
the thermostat plastic case can interfere with proper air fl ow
across the temperature sensor. Seal hole in wall to prevent
air leaks. Leaks can affect operation.

9. Install thermostat on back plate.

10. Turn on power to the unit.

o

P

On initial power up, the LCD readout will display

.

III CHECK THERMOSTAT OPERATION

1. Fan Operation

A. Press fan button, starting fan operation. Fan icon turns

on.

B. Press Fan button, stopping fan operation. Fan icon turns

off.

2. Heating Operation

A. Press and Release MODE button until HEAT is dis-

played.

B. Press up button until LCD readout reads 10 degrees

above room temperature. Heating system should begin
to operate within 5 minutes.

3. Cooling Operation

A. Press and Release MODE button until COOL is dis-

played

B. Press down button until LCD readout reads 10 degrees

below room temperature. Cooling system should begin
to operate within 5 minutes.

IV. THERMOSTAT OPERATION

1. TEMPER ATURE DISPLAY

The thermostat will display room temperature until the UP or DOWN
button is pressed. The word SET appears when these buttons
are pressed and the current set point is displayed. If no buttons
are pressed for 5 seconds, the display will change back to show
room temperature.

2. TIMEGUARD TIMER

A 5-minute timeguard is built into the thermostat immediately upon
power up, and any time the compressor turns off. The compres­sor will not turn on until the timeguard has expired. Pressing UP
and FAN buttons simultaneously will override the timeguard for
1 cycle.

WIRING DIAGRAMS

NOTE: All excess wire should be pushed back into the wall as far
as possible. Excess wire inside the thermostat plastic case may
interfere with the air fl ow across the temperature sensor.

SINGLE STAGE HEAT/COOL WIRING

Thermostat

HEAT

COOL

FAN

24 VAC HOT

4 VAC COMM

Revers ing Va lve

W

Y

G

R

C

B

Unit Terminal Strip

W

Y

G

R

C

Connection to “B”

B

terminal required on

Heat Pump models

3. CYCLE TIMER

In normal heating and cooling operation the thermostat will not
allow more than 4 equipment cycles per hour (or 1 cycle every
15 minutes). Both the Y and W outputs have a 15-minute timer
that starts counting down when the output is turned on, (e.g., if Y
output is turned on for 9 minutes and then satisfi es, it cannot turn
back on for another 6 minutes regardless of demand). However,
pressing UP and FAN buttons simultaneously or changing the set
point will override the timer for 1 cycle.

4. MINIMUM ON TIMER

Once the equipment has turned on, it will remain on for a minimum
of 3 minutes regardless of demand. However, the equipment can
turn off in less than 3 minutes if a change in set point, or a change
in mode occurs.

5. ERROR MESSAGES

E4 will be displayed if the thermostat has an internal memory failure.
If E4 appears, replace the thermostat.

- - (two dashes) will be displayed if the temperature cannot
properly read the room temperature. If - - appears, replace the
thermostat.

2