Friedrich RT6 Installation, Operation & Application Manual

RT6
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

Parts Diagram

R C GL
RESET CONFIG
Reset Configuration
switch switch

Icon Descriptions

Fan operation icon
Cooling operation icon
Heating operation icon
Heat set point when blinking
Cool set point when blinking

Specifications

Electrical rating: • 24 VAC (18-30 VAC)
• 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
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
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.
Up button
Down button
GH O/B Y W
Right (fan)
button
Left (system)
button
Lo/Hi fan
switch
Room temperature
offset activated
COOL
HEAT

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
R
120
24 VAC
VAC
C
GL
Low Fan
GH
High Fan
O/B
Y
Cool
W
Heat

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-heat pump systems, auxiliary heat for HP systems
GL – Low fan
GH – High fan
RT6 Output Chart
Configuration
Heat/Cool and single stage HP models
PDH (PTHP) models only HP 'O' Config
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. 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.
3. Press the CONFIG button for 1 second while the RT6 is in OFF mode.
Press the up or down button to change settings within each screen.
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.
Heat pump with electric backup
Transformer
120
24 VAC
VAC
Low Fan
High Fan
Reversing Valve
Compressor
Auxiliary Heat
1 ST 1 ST
Cool Heat
ELC Y, G W, G, B
Y, G, O Y, G
CONFIG
Left
button
R
C
GL
GH
O/B
Y
W
2 ND
Heat
N/A
Y, W, G
OFF
Up
button
Down
button
Right
button