Friedrich RT4 User Manual

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RT4

Manual Changeover

Non-Programmable

Hardwired

Non-ProgrammableElectronic Thermostat

For use with Friedrich PTAC and Vert-I-PakSystems

30-MinutePower Loss Memory Retention

Installation, Operation & Application Guide

 

Table of Contents

Parts Diagram...........................................................................................................................................

1

Specifications ...........................................................................................................................................

2

Important Safety Information ..................................................................................................................

2

Package Contents/Tools Required .............................................................................................................

3

General Description..................................................................................................................................

3

To Remove Existing Thermostat................................................................................................................

4

To Install Thermostat ................................................................................................................................

4

Replacing Wiring Labels ...........................................................................................................................

6

Operation.................................................................................................................................................

7

A Quick Test..............................................................................................................................................

8

Wiring Diagrams ......................................................................................................................................

9

Troubleshooting .....................................................................................................................................

10

CAUTION!: This thermostat should be installed by trained technicians only. Adhere to all local and national codes. Disconnect all power to the system before installing, removing, or cleaning.

Parts Diagram

Celsius/

Fahrenheit

Jumper

 

F–C

 

 

 

 

Heat Pump/

NON–HP

 

 

Gas

 

HP

 

 

 

Non-Heat

 

 

 

 

 

Pump Jumper

 

 

 

 

 

 

 

 

 

Electric

Gas/Electric

Reset Button

 

 

 

 

Switch

 

 

 

 

 

 

 

 

Auto

On

 

 

Cool

Off

Heat

 

 

 

 

 

 

 

 

Mode Switch

 

 

Fan Switch

1

Room temperature setpoint
Room temperature
Temperature differential setting

Specifications

Input:

Voltage: 18-30 VAC

Output:

Maximum: 1 amp per terminal (3 amp total for all terminals)

Temperature Ranges:

Temperature control range: 45°F to 90°F (7°C to 32°C)Accuracy: ± 1°F (± 0.5°C)

Differential range: 1°F to 3°F (0.5°C to 1.5°C)Accuracy: ± 1°F (± 0.5°C)

System configurations: Single stage heat pump

Terminations: R, C, W, Y, B, O, G

Note: This thermostat is designed for: Single stage electric heating, heating/cooling systems and heat pump systems. It will retain your setpoint temperatures in memory for up to 30 minutes during a power outage.

SETROOM

DIFF

Important Safety Information

Always turn off the thermostat before installing, removing, cleaning, or servicing; turn off the power at the main power source by unscrewing fuse or switching off circuit breaker

Do not switch to “Cool” if outside temperature is below 50°F (10°C), this could damage your A/C system and cause injury

Do not install on voltages higher than 30 VAC

All wiring must conform to local and national building and electrical codes and ordinances

While cleaning, do not get soap directly on thermostat switches or LCD readout; only use a damp cloth with a mild soap to wipe the outside of the thermostat cover

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Package Contents/Tools Required

Package includes: RT4non-programmablethermostat on base, thermostat cover, wiring labels, screws and wall anchors, Installation, Operation and Application Guide.

Tools required for installation: Drill with 3/16” bit, hammer, screwdriver.

General Description

The RT4 thermostat is a hardwired, digital, mercury-free,non-programmable,electronic thermostat

Compatible with single stage heating/cooling systems, and heat pump systems

Separate setpoints for heating and cooling

Freeze Protection Feature: Protects pipes from freezing! If the room temperature drops to 40°F, the thermostat automatically turns on the heat; the thermostat must be in the Heat position

Built-in Compressor Protection for Air Conditioners; to protect the A/C’s compressor, there is a5-minutedelay between the system turning off and the A/C starting

30-minutepower loss memory retention protection

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To Remove Existing Thermostat

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

1.Turn off power to the heating and cooling system by removing the fuse or switching off the appropriate circuit breaker.

2.Remove cover of old thermostat. This should expose the wires.

3.Label the existing wires with the enclosed wire labels before removing wires. See table on Page 6 for old and new label identification.

4.After labeling wires, remove wires from wire terminals.

5.Remove existing thermostat base from wall.

6.Refer to the following section for instructions on how to install this thermostat.

To Install Thermostat

ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat.

IMPORTANT: Thermostat installation must conform to local and national building and electrical codes and ordinances.

Note: Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in direct sunlight, behind a door, or in an area affected by a vent or duct.

1.Turn off power to your system. Move the Mode switch toOff.

2.Move the Fan switch toAuto.

3.To remove cover, insert and twist a coin or screwdriver in the slots on the sides of the thermostat.

4

To Install Thermostat (continued)

4.Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire opening in the base of the thermostat).

5.Mark the placement of the mounting holes.

6.Set thermostat base and cover away from working area.

7.Using a 3/16” drill bit, drill holes in the places you have marked for mounting.

8.Use a hammer to tap supplied anchors into mounting holes.

9.Align thermostat base with mounting holes and feed the control wires through wire opening.

10.Use supplied screws to mount thermostat base to wall.

CAUTION!: Be sure exposed portion of wires does not touch other wires.

11.Tighten screws on terminal block. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper terminal.

12.Seal hole for wires behind thermostat with non-flammableinsulation or putty.

13.Set the Gas/Electric switch toelectric, and heat pump jumper toNON-HP.

14.Set the temperature scale jumper to Fahrenheit or Celsius.

15.Replace cover on thermostat by snapping it in place.

16.Turn on power to the system at the main service panel.

5

Replacing Wiring Labels

Replace the old labels with the enclosed new labels:

Old

New

Type

F, G

G

Fan control relay

 

 

 

B

B

Heat active reversing valve

 

 

 

Y, Y6

Y

Cooling control

 

 

 

H, W, 4

W

Heating control

 

 

 

C

C

Transformer, common side

 

 

 

M, 4, RH, RS, R

R

Transformer, hot side

 

 

 

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Operation

Setting the Room Temperature (Setpoint Temperature)

Step 1:

Press the

or

button; the current temperature setpoint displays.

Step 2:

Press the

or

button until the desired temperature setpoint displays.

The new temperature setting is automatically saved. After 5 seconds, the display returns to showing the current room temperature.

Setting a New Temperature Differential

The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat turns on your system. If you notice your system turning on and off too frequently, increase the temperature differential.

Step 1: Remove the cover and press theReset button once.

Step 2: For the first 10 seconds of operation, the temperature differential is displayed. Press theorbutton to select desired setting.

Changing Fahrenheit to Celsius

The temperature displays in degrees Fahrenheit as a factory set default. Follow these steps to change to degrees Celsius:

Step 1: Remove the cover.

Step 2: Move theF/C jumper to the desired position,F orC using the center pin as a common.Step 3: Press theReset button once and reinstall the cover.

Your LCD readout changes accordingly.

Starting the Thermostat

Step 1: Move theFan Auto/On switch into theAuto position.

Step 2: Move theMode switch toHeat orCool, depending on the season.

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A Quick Test

CAUTION!: Do not switch system to cool if the outdoor temperature is below 50°F (10°C). This can damage the air conditioning system and may cause personal injury.

Action: Set theMode switch toCool. Press thebutton until the temperature setting is 3°F below the room temperature.

Result: The A/C system and fan should turn on.

Action: Set theMode switch toOff.

Result: The A/C should turn off (there may be a fan delay).

Action: Set theMode switch toHeat. Press thebutton until the temperature setting is 3°F above the room temperature.

Result: The heating systems and fan should turn on (there may be a time delay depending on your system).

Action: Set theMode switch toOff.

Result: The heating system should turn off (there may be a fan delay).

Action: Set theFan switch toOn (continuous indoor fan operation).Result: The blower fan should turn on.

Action: Set theFan switch toAuto.

Result: The blower fan should turn off.

If the above test was successful, you have a proper installation.

If not: Double check that wires are securely connected and are connected to the proper terminals. Consult the troubleshooting section (see Page 10).

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