Friedrich RT4 User Manual
RT4
Non-Programmable Electronic Thermostat
• For use with Friedrich PTAC and Vert-I-Pak Systems
• 30-Minute Power Loss Memory Retention
Installation, Operation & Application Guide
Manual Changeover
Non-Programmable
Hardwired
Table of Contents
Parts Diagram ........................................................................................................................................... 1
Specifications ........................................................................................................................................... 2
Important Safety Information .................................................................................................................. 2
Package Contents/Tools Required ............................................................................................................. 3
General Description .................................................................................................................................. 3
To Remove Existing Thermostat ................................................................................................................ 4
To Install Thermostat ................................................................................................................................ 4
Replacing Wiring Labels ........................................................................................................................... 6
Operation ................................................................................................................................................. 7
A Quick Test.............................................................................................................................................. 8
Wiring Diagrams ...................................................................................................................................... 9
Troubleshooting ..................................................................................................................................... 10
caution!
:
This thermostat should be installed by trained technicians only. Adhere to all local and
national codes. Disconnect all power to the system before installing, removing, or cleaning.
Celsius/
Fahrenheit
Jumper
Parts Diagram
F–C
Heat Pump/
Non-Heat
Pump Jumper
Reset Button
NON–HP
HP
Gas
Electric
OnAuto
Cool Heat
Off
Mode Switch Fan Switch
Gas/Electric
Switch
1
Specifications
Input:
• Voltage: 18-30 VAC
Output:
• Maximum: 1 amp per terminal (3 amp total for all terminals)
Temperature Ranges:
• Temperature control range: 45°F to 90°F (7°C to 32°C) Accuracy: ± 1°F (± 0.5°C)
• Differential range: 1°F to 3°F (0.5°C to 1.5°C) Accuracy: ± 1°F (± 0.5°C)
• System configurations: Single stage heat pump
• Terminations: R, C, W, Y, B, O, G
• Note: This thermostat is designed for: Single stage electric
heating, heating/cooling systems and heat pump
systems. It will retain your setpoint temperatures in
memory for up to 30 minutes during a power outage.
Room temperature
setpoint
Room temperature
Temperature
differential setting
SET
ROOM
DIFF
Important Safety Information
• Always turn off the thermostat before installing, removing, cleaning, or servicing; turn off the power at the main
power source by unscrewing fuse or switching off circuit breaker
• Do not switch to “Cool” if outside temperature is below 50°F (10°C), this could damage your A/C system and cause
injury
• Do not install on voltages higher than 30 VAC
• All wiring must conform to local and national building and electrical codes and ordinances
• While cleaning, do not get soap directly on thermostat switches or LCD readout; only use a damp cloth with a mild
soap to wipe the outside of the thermostat cover
2
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