New Room Stat Honeywell Digital DT200

[alan8376]

My current roomstat is an old Honewell type dial model T6360 with connections 1,2,3. etc.

I,ve bought a digital type Honeywell D200, T6620B 1008, which has a,b,c connections.

The instructions indicate I should use connections a and b, on the digital, but not sure whether 2 or 3 should be connected to b?

I have a Y Plan system, Oil Boiler with a 3 Port Mid Pos Valve, type 4073A

Can anyone advse off wiring connection?

Thanks
Alan

 

[stumpydick]

term 2 on old stat is neutral. Not used on digital. Connect 1 and 3 and make safe neutral in choc block and tape.

 

[alan8376]

Thanks for the info.

Regards
Alan