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RT6
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.
Electronic Thermostat
•1-Stage Heat/1-Stage Cool Systems
•Configurable to: 2-stage heat pump
•Large Display With Backlight
•Selectable Fahrenheit or Celsius
Installation, Operation & Application Guide
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”.
Parts Diagram
Wiring Diagrams
Heat/Cool Systems
Up button
Heat pump with electric backup
Transformer
Down button
R
RESET
C GL GH O/B Y
120
VAC
Right (fan)
button
CONFIG
Configuration
switch
Lo/Hi fan
switch
Fan operation icon
Heating operation icon
COOL
120
VAC
C
R
24 VAC
C
Low Fan
GL
Low Fan
GL
High Fan
GH
High Fan
GH
O/B
Reversing Valve
O/B
Cool
Y
Compressor
Y
Heat
W
Auxiliary Heat
W
Terminal Designator Descriptions
Icon Descriptions
Cooling operation icon
24 VAC
W
Left (system)
button
Reset
switch
Transformer
R
Room temperature
offset activated
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-heat pump systems, auxiliary heat for HP systems
GL – Low fan
GH – High fan
HEAT
Heat set point when blinking
RT6 Output Chart
Cool set point when blinking
Configuration
Specifications
Electrical rating: •24 VAC (18-30 VAC)
•1 amp maximum per terminal
•3 amp maximum total load
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.
Temperature control range: 45°F to 90°F (7°C to 32°C) Accuracy: ± 1°F (± 0.5°C)
System configurations: 2-stage heat, 1-stage cool, heat pump, electric
Timing: Anti-short Cycle: 4 minutes (bypass anti-short cycle 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
Configuration Mode
The configuration mode is used to set the RT6 to match your heating/cooling system. The RT6 functions with heat
pump, air conditioning, or electric heat systems.
Note:Thermostat comes configured for 1-stage heat / 1-stage cooling for use with all heat/cool and single-stage heat
pump models.For Friedrich PTHP models follow the instructions below to configure the thermostat for two-stage
heat pump operation using the ‘O’ terminal.
To configure the RT6, perform the following steps:
1. Verify the RT6 is in the OFF 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 the RT6 is in OFF mode.
CONFIG
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
Press the up or down button to change settings within each screen.
Up
button
Down
button
To Remove Existing Thermostat
1.
2.
3.
4.
5.
6.
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.
Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit
breaker off.
Remove cover of old thermostat. This should expose the wires.
Label the existing wires with the enclosed wire labels before removing wires.
After labeling wires, remove wires from wire terminals.
Remove existing thermostat base from wall.
Refer to the following section for instructions on how to install this thermostat.
Press the right button to advance to the next screen.
Note: Pressing the left button will return you to the previous screen.
To exit configuration mode, press the CONFIG switch for 1 second.
Left
button
Right
button
Operating Modes
Configuration Mode Settings
There are three possible operating modes for the RT6. Off, Heat, and Cool modes are accessed by pressing the
SYS (left) button.
The setup screens for Configuration Mode are as follows:
1. System – Set for heat pump, non-heat pump, 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
Heat Pump Only
ELC
N/A
VEA, PDE (PTAC), Kuhl+
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 word FAN 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.
Press the up or down 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 or down button to select.
Press the right button to advance to the next screen.
Cool Mode
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 or down button to set differential value.
Press the right 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 or down 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 or down 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 or down button to select.
Press the right button to advance to the next screen.
• 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.
HEAT icon will 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.
COOL icon will 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 a four-minute delay to protect your compressor after it turns off. To bypass the
compressor time delay, go to OFF mode for 5 seconds.
7.
Maximum Heat Setpoint (45°F to 90°F) (7°C to 32°C)
Adjust to control the maximum heat set temperature allowed.
Press the up or down 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 the up or down 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 or down button to select.
Press the right button to advance to the next screen.
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 a four-minute time 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. Press FAN (right) button. Indoor fan turns OFF.
Mode of Operation
OFF
The RT6 is a 1-stage or 2-stage heat thermostat. It functions with air conditioning, heat pumps, or electric heat
systems.
Troubleshooting
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, and Cool 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
Down button
SYStem (left)
FAN (right)
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
frequently
Adjust temperature differential (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.
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.
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
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