TRV Question

25 Nov 2005
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United Kingdom
Can someone help my understanding please. I have a Eurocal Combi Boiler (installed in the shed) with TRVs on all radiators except one (bathroom) and no room thermostats. I understand how TRVs work which is pretty simple, but not how should these work in conjunction with the boiler.

I have the heating set (via a timer) to come on for a few hours in the evening and it duely does, the boiler fires approximately every 10~15 minutes and the required radiators heat up.

To assist my understanding I suppose my questions are as follows:

1) When the heating is on, is it the TRVs that control how often the boiler fires up?

2) If the heating was switched on and I turned all the TRVs down to zero, would the boiler fire up?

3) When the heating is switched on, what prompts the boiler to fire up? Is it when the ambient temperature drops below the temperature on the TRV?

I would really appreciate it if some one would give me a descriptive explanation of how this system works.

Looking forward to your replies.
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(1) No.
(2) Only briefly to heat itself up.
(3) Boiler firing is controlled by boiler thermostat.

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