Friedrich RT4 Manuale Utente

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   button until the temperature setting is 3°F above the room 

temperature. 

 

Result:  The heating systems and fan should turn on (there may be a time delay depending on your system).

Action: Set the Mode switch to Off. 

 

Result:  The heating system should turn off (there may be a fan delay). 

Action: Set the Fan switch to On (continuous indoor fan operation). 

 

Result:  The blower fan should turn on. 

Action: Set the Fan switch to Auto. 

 

Result:  The blower fan should turn off.

If the above test was successful, you have a proper installation. 
If not: 

Double check that wires are securely connected and are connected to the proper terminals. Consult the 

troubleshooting section (see Page 10).