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Configuration Mode Settings
The setup screens for Configuration Mode are as follows:
1. System – Set for heat pump, non-heat pump, reversing valve operation
System
Setting
Heat Pump
HP
Heat/Cool and Single-Stage
ELC
Heat Pump Only
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.
3. 1
st
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. 2
Stage Temperature Differential (1°F to 5°F) (0.5°C to 2.5°C) (For HP 0 only)
nd
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.
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.
Mode of Operation
The RT6 is a 1-stage or 2-stage heat 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, 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
SYStem (left)
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.
Reversing Valve Setting
Friedrich Models
O - Energized in Cooling
PDH (PTHP) Only
N/A
VEA, PDE (PTAC), Kuhl+
Up button
Down button
FAN (right)
Operating Modes
There are three possible operating modes for the RT6. Off, Heat, and Cool modes are accessed by pressing the
SYS (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 word FAN shows on the display and
the fan icon
appears when the fan operates.
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 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.
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.
Troubleshooting
Symptom
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
OFF
HEAT icon will blink.
COOL icon will blink.
OFF
Remedy
LIAF126
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