Heating thermostat wiring

[hotdog62]

Hi
I am replacing a Eberle type 15015 room thermstat with a Danfoss Retb one, the Eberle has 4 wires going to it. one yellow, one red, one blue and a earth, the Danfoss only needs 3 wires. my question is does the Danfoss not need the earth wire?
many thanks

 

[D_Hailsham]

What type of heating system do you have - gas or electric?

 

[hotdog62]

Hi
Gas central heating

 

[Iddy]

Normally Red=Live Feed; Yellow=Live Return (Switched Live from 'stat); Blue=Neutral.


http://na.heating.danfoss.com/PCMPDF/RETB instruc.pdf

According to page 5 of the above, the Danfoss just needs the Red to Terminal 3, and Yellow to Terminal 2.

The above needs to be confirmed with a multimeter and the Neutral and Earth made safe