Summary of the content on the page No. 1
Manual Changeover
Non-Programmable
RT4
Hardwired
Non-Programmable Electronic Thermostat
• For use with Friedrich PTAC and Vert-I-Pak Systems
• 30-Minute Power Loss Memory Retention
Installation, Operation & Application Guide
Summary of the content on the page No. 2
Table of Contents Parts Diagram ........................................................................................................................................... 1 Specifications ........................................................................................................................................... 2 Important Safety Information .................................................................................................................. 2 Package Contents/Tools
Summary of the content on the page No. 3
Parts Diagram Celsius/ Fahrenheit Jumper F–C NON–HP Heat Pump/ HP Gas Non-Heat Pump Jumper Electric Gas/Electric Switch Reset Button Auto On Cool Heat Off Mode Switch Fan Switch 1
Summary of the content on the page No. 4
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 Room temperature setpoint • Note: This thermostat is designed for: Single stage electric SET heating, heating/coolin
Summary of the content on the page No. 5
Package Contents/Tools Required Package includes: RT4 non-programmable 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. General Description • The RT4 thermostat is a hardwired, digital, mercury-free, non-programmable, electronic thermostat • Compatible with single stage heating/cooling systems, and heat pump systems • Separate setpoints for he
Summary of the content on the page No. 6
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 off the appropriate circuit breaker. 2. Remove cover of old thermostat. This should expose the wires. 3. Label the existing wires with the enclosed wire labels before removing wires. Se
Summary of the content on the page No. 7
To Install Thermostat (continued) 4. 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). 5. Mark the placement of the mounting holes. 6. Set thermostat base and cover away from working area. 7. Using a 3/16” drill bit, drill holes in the places you have marked for mounting. 8. Use a hammer to tap supplied anchors into mounting holes. 9. Align thermostat base with mounting holes and feed the control wir
Summary of the content on the page No. 8
Replacing Wiring Labels Replace the old labels with the enclosed new labels: Old New Type F, G G Fan control relay B B Heat active reversing valve Y, Y6 Y Cooling control H, W, 4 W Heating control C C Transformer, common side M, 4, RH, RS, R R Transformer, hot side 6
Summary of the content on the page No. 9
Operation Setting the Room Temperature (Setpoint Temperature) Step 1: Press the or button; the current temperature setpoint displays. Step 2: Press the or button until the desired temperature setpoint displays. The new temperature setting is automatically saved. After 5 seconds, the display returns to showing the current room temperature. Setting a New Temperature Differential The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat turns on yo
Summary of the content on the page No. 10
A Quick Test caution!: Do not switch system to cool if the outdoor temperature is below 50°F (10°C). This can damage the air conditioning system and may cause personal injury. Action: Set the Mode switch to Cool. Press the button until the temperature setting is 3°F below the room temperature. Result: The A/C system and fan should turn on. Action: Set the Mode switch to Off. Result: The A/C should turn off (there may be a fan delay). Action: Set the Mode switch to Heat. Press the butto
Summary of the content on the page No. 11
Wiring Diagram HARDWIRED T C C F H R R R E I P W W R E T M D Y Y A O R B B C S I T O C A H G G T NOTE: B terminal used on heat pump models only 9
Summary of the content on the page No. 12
Troubleshooting Symptom Remedy The system is not turning on Check the wiring (see Installation, Page 4) LCD is blank Check the wiring (see Installation, Page 4) Thermostat is not properly controlling the fan Check that the Gas/Electric switch is set to electric Thermostat is continuously turning on and off Increase the temperature differential (see Setting a New Temperature Differential, Page 7) Temperature display is not accurate Your thermostat has two options for temperature readout: Fahrenh
Summary of the content on the page No. 13
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
