how to wire new HONEYWELL DT90E digital room thermostat

[kennymcd]

I am new to forum so Hi.
I have an old honeywell control room thermostat and I want to change to a HONEYWELL DT90E digital room thermostat. I have a RED wire and Black wire connected to the old thermostat.
2 questions: will this new thermostat do the job and where do I connect these two wires to on the new thermostat. Thanks

 

[gas112]

If you only have two wires to your existing stat then connect then to A and B of the 90

 

[Ches1andonly]

Did this work as i am thinking of doing the same?

 

[D_Hailsham]

Did this work as i am thinking of doing the same?

It's over a year since the OP was given the advice, so I think he would have come back if it didn't work.

PS The advice given was correct. If you have three wires connected to the old stat, come back with more info, i.e. make/model of stat and which wires are connected to which terminal.

 

[Ches1andonly]

Only the 3 wires black red and earth so think its going to work so I think I will purchase one.

 

[D_Hailsham]

Only the 3 wires black red and earth so think its going to work so I think I will purchase one.

Not necessarily as you can't trust wire colours. You must let me have the info I asked for (make and model, which wire to which terminal).

 

[Ches1andonly]

 

[Ches1andonly]

Earth no 1
Black no 3
Red no 5

 

[Ches1andonly]

Actually red is in no 1 I was just numbering them 1 to 5 left to right before

 

[denso13]

If you only have two wires to your existing stat then connect then to A and B of the 90

This should work using the red and black. You seem to be missing a neutral on the existing one but don't need it on the new one anyway.

 

[Ches1andonly]

Cheers thanks for the info