Honeywell CMT927 Wiring question

[tapped]

Hi

I have a conventional condesing boiler running off a timer unit and sunvic tlx201 thermostat in a 2 year old house

The thermostat has wires to COM, DEMAND and N

How do I connect up the reciever/relay unit to these 3 wires when replacing the 'stat? I am planning on just setting the original programmer to permanently "ON" for the CH and only then using that origianl timer unit for the HW

cheers!!!

 

[D_Hailsham]

The thermostat has wires to COM, DEMAND and N

Sunvic = Honeywell
Com = L
N = N
Demand = B

If that does not work, reverse the L and B wires - it was wrongly wired to begin with.

Also connect L to A in the receiver

I am planning on just setting the original programmer to permanently "ON" for the CH

That's OK until someone accidentally turns the CH OFF at the programmer. A better way is to disconnect the wire from the CH ON terminal of the programmer and connect it to the L terminal.

 

[tapped]

Hi there

Well, finally got around to fitting this today. Relay lamp illuminates in repsonse to transmitter but boiler is not responding....

I tried swapping the two wires (L & B) but still nothing. Am I missing something?


many thanks!

cheers

Paul