Friedrich RT6 User Manual

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RT6

Electronic Thermostat

1-StageHeat/1-StageCool Systems

Configurable to: 2-stageheat pump

Large Display With Backlight

Selectable Fahrenheit or Celsius

Installation, Operation & Application Guide

Parts Diagram

Up button

Down button

 

R

C

GL GH O/B Y

W

 

 

 

 

Right (fan)

RESET

CONFIG

 

 

button

 

 

 

 

 

 

 

Left (system)

 

 

 

 

button

Reset

Configuration

 

Lo/Hi fan

switch

switch

 

switch

Icon Descriptions

Fan operation icon

 

Room temperature

 

offset activated

 

COOL

Cooling operation icon

 

 

 

Heating operation icon

HEAT

 

 

 

Heat set point when blinking

 

 

Cool set point when blinking

 

 

Specifications

Electrical rating: • 24 VAC(18-30VAC)

1 amp maximum per terminal

3 amp maximum total load

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

System configurations: 2-stageheat,1-stagecool, heat pump, electric

Timing: Anti-shortCycle: 4 minutes (bypassanti-shortcycle delay by returning to OFF mode for 5 seconds) Backlight Operation: 10 seconds

Terminations: R, C, GL, GH, O/B, Y, W

Important Safety Information

WARNING!: Always turn off power at the main power supply before installing, cleaning, or removing thermostat.

This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC

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

Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system and cause personal injuries

Use this thermostat only as described in this manual

Package Contents/Tools Required

Package includes: RT6 thermostat 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

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 the appropriate circuit breaker off.

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

3.Label the existing wires with the enclosed wire labels before removing wires.

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 the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off.

2.To remove cover, pull gently at the seam at the top.

3.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).

4.Mark the placement of the mounting holes.

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

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

7.Use a hammer to tap supplied anchors in mounting holes.

8.Align thermostat base with mounting holes and feed the control wires through slit in thermal intrusion barrier and into wire opening.

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

10.Insert stripped, labeled wires in matching wire terminals.

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

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

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

13.Configure thermostat to match the type of system you have.

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

15.Test thermostat operation as described in “Testing the Thermostat”.

Wiring Diagrams

Heat/Cool Systems

 

Transformer

 

120

24 VAC

R

 

VAC

C

 

 

 

 

Low Fan

GL

 

High Fan

GH

 

 

O/B

 

Cool

Y

 

Heat

W

Heat pump with electric backup

 

Transformer

 

120

24 VAC

R

 

VAC

C

 

 

 

 

Low Fan

GL

 

High Fan

GH

 

Reversing Valve

O/B

 

Compressor

Y

 

Auxiliary Heat

W

Terminal Designator Descriptions

R – 24 VAC hot

C – 24 VAC common

O/B – Configurable

O – Cool active reversing valve (Freidrich PTHP)

B – Heat active reversing valve (Freidrich Vert-I-Pak,Kuhl+HP)

Y – 1st stage cool, 1st stage heat for heat pumps

W – 1st stage heat for non-heatpump systems, auxiliary heat for HP systems

GL – Low fan

GH – High fan

RT6 Output Chart

 

Configuration

1ST Cool

1ST Heat

2ND Heat

Heat/Cool and single stage HP models

ELC

Y, G

W, G, B

N/A

 

 

 

 

 

PDH (PTHP) models only

HP ‘O’ Config

Y, G, O

Y, G

Y, W, G

 

 

 

 

 

The RT6 thermostat is configurable for different systems. The configuration directly affects the outputs. Use the output chart to correctly configure and wire the thermostat to your system.

Configuration Mode

The configuration mode is used to set the RT6 to match your heating/cooling system. TheRT6 functions with heat pump, air conditioning, or electric heat systems.

Note: Thermostat comes configured for1-stageheat /1-stagecooling for use with all heat/cool andsingle-stageheat pump models.For Friedrich PTHP models follow the instructions below to configure the thermostat fortwo-stageheat pump operation using the ‘O’ terminal.

To configure the RT6, perform the following steps:

1.

Verify the RT6 is in theOFF mode.

 

 

 

Press the SYS (left) button until off mode displays.

 

 

2.

Remove the cover of the thermostat by gently pulling near one of the corners at

 

 

 

the top of the thermostat.

 

OFF

3.

Press the CONFIG button for 1 second while theRT6 is inOFF mode.

 

 

 

 

CONFIG

 

Press the up ordown button to change settings within each screen.

 

Up

 

 

 

button

 

 

 

Down

 

 

 

button

Press the right button to advance to the next screen.

 

 

 

Note: Pressing theleft button will return you to the previous screen.

Left

Right

 

 

button

button

To exit configuration mode, press the CONFIG switch for 1 second.

COOL icon will blink.
HEAT icon will blink.

Configuration Mode Settings

The setup screens for Configuration Mode are as follows:

1. System – Set for heat pump,non-heatpump, reversing valve operation

System

Setting

Reversing Valve Setting

Friedrich Models

 

 

 

 

Heat Pump

HP

O - Energized in Cooling

PDH (PTHP) Only

 

 

 

 

Heat/Cool and Single-Stage

ELC

N/A

VEA, PDE (PTAC), Kuhl+

Heat Pump Only

 

 

 

 

 

 

 

Press the up ordown button to select.

Press the right button to advance to the next screen.

2. Temperature Scale(F or C) Choose Fahrenheit or Celsius.

Press the up ordown button to select.

Press the right button to advance to the next screen.

3. 1st Stage Temperature Differential (1°F to 5°F) (0.5°C to 2.5°C)

Set the number of degrees between your “setpoint” temperature and your “turn on” temperature.

Press the up ordown button to set differential value. Press theright button to advance to the next screen.

4. 2nd Stage Temperature Differential (1°F to 5°F) (0.5°C to 2.5°C)(For HP 0 only)

Set the number of degrees between when stage 1 turns on and when stage 2 turns on. Press the up ordown button to set differential value.

Press the right button to advance to the next screen.

5. Staged Off Outputs(For HP 0 only)

Select whether the outputs for heating and cooling are staged off independently or are satisfied simultaneously.

1 = outputs staged off independently

0 = outputs off simultaneously Press the up ordown button to set.

Press the right button to advance to the next screen.

6. Auxiliary Delay ON (0-30 minutes) (For HP 0 only)

Set the delay time in minutes for auxiliary heat to be locked out after a call for second stage. This extra savings feature is used to temporarily lock out auxiliary heat devices, allowing just heat pump to try to satisfy heat call.

Press the up ordown button to select.

Press the right button to advance to the next screen.

7. Maximum Heat Setpoint (45°F to 90°F) (7°C to 32°C) Adjust to control the maximum heat set temperature allowed. Press theup ordown button to select.

Press the right button to advance to the next screen.

8. Minimum Cool Setpoint (45°F to 90°F) (7°C to 32°C) Adjust to control the minimum cool set temperature allowed. Press theup ordown button to select.

Press the right button to advance to the next screen.

9. Room Temperature Offset (+9°F to-9°F)(+4.5°C to-4.5°C)

Adjust to calibrate displayed room temperature to match actual room temperature.

Note: When not set to 0,will display.

Press the up ordown button to select.

Press the right button to advance to the next screen.

Mode of Operation

The RT6 is a1-stageor2-stageheat thermostat. It functions with air conditioning, heat pumps, or electric heat systems.

The thermostat activates the heating appliance when the room temperature is below the set heat temperature (by the differential temperature). The RT6 will stop outputting when the call for heat has been satisfied. With heat pumps, the thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor.

When the room temperature is greater than the set cool temperature (by the differential temperature), the cooling device is activated. The RT6 will stop outputting when the call for cooling is satisfied. The thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor.

The RT6 has three possible operating modes:OFF,Heat, andCool mode. In off mode, the thermostat will not turn on heating or cooling devices. The manual fan can be turned on in all operating modes using the fan button. In heat mode, the thermostat controls the heating system. In the cool mode, the thermostat controls the cooling system.

Button Functions

Up button

Downbutton

SYStem (left)

FAN (right)

UP – Used to increase the set temperatures and to adjust configuration settings.

DOWN – Used to decrease the set temperatures and to adjust configuration settings.

SYS (left) – Used to change from OFF, HEAT, and COOL modes

FAN (right) – Used to turn on and off the indoor fan.

Operating Modes

There are three possible operating modes for the RT6. Off, Heat, and Cool modes are accessed by pressing theSYS (left) button.

OFF Mode

 

• In this mode, the thermostat will not turn on the heating or cooling devices

Note: The indoor fan can be turned on manually in every operating mode by

pressing the FAN (right) button. The wordFAN shows on the display and

the fan icon

appears when the fan operates.

 

OFF

Heat Mode

• In this mode, the thermostat controls the heating system. When the heat outputs, the flame icon apprears on the display.

Note: For heat pumps, there is a four minute delay for your compressor to restart after it has turned off. To bypass the compressor time delay, go to OFF mode for 5 seconds.

Cool Mode

• In this mode, the thermostat controls the cooling system. When the cooling outputs, the snowflake icon apprears on the display.

Note: There is a four minute delay for your compressor to restart after it has turned off. To bypass the compressor time delay, go to OFF mode for 5 seconds.

Set Point Adjustment

Heat Set Point

• Use the SYS button to select Heat Mode. Press the up or down button to view the current heat set point larger on the display. When the large set point is displayed, the HEAT icon will blink. The up or down buttons can be used to adjust the set point. After 5 seconds of inactivity the screen will display the room temperature and the HEAT icon will not blink.

Cool Set Point

Use the SYS button to select Cool Mode. Press the up or down button to view the current cool set point larger on the display. When the large set point is displayed,

the COOL icon will blink. The up or down buttons can be used to adjust the set point. After 5 seconds of inactivity the screen will display the room temperature and the COOL icon will not blink.

Testing the Thermostat

Once the thermostat is configured, it should be thoroughly tested.

CAUTION!: Do not energize the air conditioning system when the outdoor temperature is below 50 degrees. It can result in equipment damage or personal injury.

Heat Test

1. Press SYS (left) button until heat mode is displayed.

2. Adjust the set temperature so it is 5 degrees above the room temperature. 3. Heat should come on within a few seconds.

4. Adjust the set temperature 2 degrees below the room temperature and the heat should turn off. There may be a fan delay on your system.

Note: For heat pumps, there is afour-minutedelay to protect your compressor after it turns off. To bypass the compressor time delay, go to OFF mode for 5 seconds.

Cool Test

1. Press SYS (left) button until cool mode is displayed.

2. Adjust set temperature so it is 5 degrees below room temperature. 3. A/C should come on within a few seconds.

4. Adjust the set temperature 2 degrees above the room temperature and the A/C should turn off. There may be a fan delay on your system.

Note: There is afour-minutetime delay to protect the compressor after it . To bypass the compressor time delay, go to OFF mode for 5 seconds.

Fan Test

1. Press FAN (right) button. Fan displays. Indoor fan turns ON. 2. PressFAN (right) button. Indoor fan turns OFF.

OFF

 

Troubleshooting

 

 

Symptom

Remedy

No display

Check for 24 VAC at thermostat; display is blank when 24 VAC is not

 

present

 

 

All thermostat buttons are inoperative

Verify 24 VAC is present; unit locks out when 24 VAC is not present

 

 

No response with first button press

First button press activates backlight only

 

 

Thermostat turns on and off too

Adjust temperature differential

frequently

(see Configuration Mode Settings 3 & 4)

 

 

Fan runs continuously

Press FAN (right) button to turn fan off

 

 

Room temperature is not correct

Calibrate thermostat (see Configuration Mode Setting 10)

 

 

Heat or Cool not coming on

Verify wiring is correct, gently pull on each wire to verify there is a good

 

connection at terminal block

 

 

HEAT blinking

In heat set point screen, this is normal operation

 

 

COOL blinking

In cool set point screen, this is normal operation

 

 

Problem not listed above

Press Reset button once*

 

 

* Reset Button Function: Display is refreshed, configuration settings are unchanged.

Friedrich Air Conditioning Co.

Post Office Box 1540 • San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway • San Antonio, Texas 78218-5212(210)357-4400• FAX (210)357-4480

www.friedrich.com LIAF126