Hi

I want to replace an hold whiterodgers thermostat 1e30-910 with a honeywell RTH230B for
Oil heating system.
There are two wires for the old one, one is connected to a point marked with R5 which is connected with a white wire to the mercury "bulb". The other is marked with 4 and is connected to the middle of the thermostat.

Which of the wires I connect to W and which to Rh?

Thanks, kobics

Hi

I want to replace an hold whiterodgers thermostat 1e30-910 with a honeywell RTH230B for
oil heating system.
There are two wires for the old one, one is connected to a point marked with R5 which is connected with a white wire to the mercury "bulb". The other is marked with 4 and is connected to the middle of the thermostat.

Which of the wires I connect to W and which to Rh?

Thanks, kobics



White to W