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.
RT6
Electronic 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-Stage Heat/1-Stage Cool Systems
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit
breaker off.
• Configurable to: 2-stage heat pump
• Large Display With Backlight
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).
• Selectable Fahrenheit or Celsius
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.
Installation, Operation & Application Guide
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
Heat pump with electric backup
Up button
Transformer
Transformer
Down button
R
R
120
VAC
120
24 VAC
24 VAC
VAC
C
C
Low Fan
High Fan
GL
GH
O/B
Y
Low Fan
GL
GH
O/B
Y
High Fan
Reversing Valve
Compressor
R
C
GL GH O/B
Y
W
Right (fan)
button
Cool
Heat
RESET CONFIG
Auxiliary Heat
W
W
Left (system)
button
Reset
switch
Configuration
switch
Lo/Hi fan
switch
Terminal Designator Descriptions
R – 24 VAC hot
C – 24 VAC common
O/B – Configurable
Icon Descriptions
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
Room temperature
offset activated
Fan operation icon
Cooling operation icon
Heating operation icon
COOL
HEAT
GH – High fan
Heat set point when blinking
Cool set point when blinking
RT6 Output Chart
1ST Cool
1ST Heat
W, G, B
Y, G
2ND Heat
N/A
Configuration
Heat/Cool and single stage HP models
PDH (PTHP) models only
ELC
Y, G
HP ‘O’ Config
Y, G, O
Y, W, G
Specifications
The RT6 thermostat is configurable for different systems. The configuration directly affects the outputs.
Electrical rating: • 24 VAC (18-30 VAC)
Use the output chart to correctly configure and wire the thermostat to your system.
• 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-stage heat, 1-stage cool, heat pump, electric
Configuration Mode
Timing: Anti-short Cycle: 4 minutes (bypass anti-short cycle delay by returning to OFF mode for 5 seconds)
Backlight Operation: 10 seconds
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.
Terminations: R, C, GL, GH, O/B, Y, W
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:
Important Safety Information
WARNING!: Always turn off power at the main power supply before installing, cleaning, or removing
1. Verify the RT6 is in the OFF mode.
thermostat.
Press the SYS (left) button until off mode displays.
• 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
2. Remove the cover of the thermostat by gently pulling near one of the corners at
OFF
the top of the thermostat.
• Use this thermostat only as described in this manual
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
Press the up or down button to change settings within each screen.
Up
button
Tools required for installation: Drill with 3/16” bit, hammer, screwdriver
Down
button
Press the right button to advance to the next screen.
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.
Note: Pressing the left button will return you to the previous screen.
Left
button
Right
button
To exit configuration mode, press the CONFIG switch for 1 second.
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.
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