Honeywell T6360 to Honeywell DT90E wiring question.

[Intelvision]

Hi all and thanks for taking the time to read this.

I am changing a Honeywell T6360 to a Honeywell DT90E in my house and have a question regarding the wiring.

Terminal 1 (brown) goes to A
Terminal 3 (2 blacks)goes to B.

This leaves terminal 2 and the Earth, which I made safe and didn't fit to the DT90E. When I activate the new thermostat the underfloor heating pump kicks in but the boiler doesn't seem to fire up. Have I missed something ?


Cheers.

 

[CBW]

Doesn’t appear to be anything missed, especially if the pump is kicking in. Definitely on at the programmer? Have you checked the zone valve. I take it that it worked before you changed over?

 

[Intelvision]

Thanks for the reply Chris, as it turns out it was muppetry on my part, thought the boiler would fire up at the same time as the pump, there is a few minutes delay for some reason, and a few minutes of run on after I have turned the thermostat down. But it is working, I presume the delay is normal ?.

 

[CBW]

A slight delay is normal, especially if there’s a previous demand being satisfied, eg on a Combi boiler it will pump overrun after a hot water demand.