I have received some help (from Ed and others) tuning my CH in the
recent past. The set-up is: a Potterton Netaheat conventional boiler
(its stat set to 3); a Honeywell CM907 programmable thermostat at the
hall (driving the CH pump); TRVs everywhere but the hall rad; and a
hot-water tank with an external thermostat attached to it (set to 70;
doubt I am getting that).
The coldest room is my lounge. I struggle to get it to 19.5 in this
weather and the heating has been on for over 12 hours (though the room
stat has cut in hours ago). According to
I need ~10K BTUs.
I have approx 13,200 BTUs available from my two, similar, 25-yo rads
in the lounge. The TRVs are full on, as are the other valves. When the
heating is on, touching the top of the rads is possible but painful.
The target temp is 21 degrees (for the room stat and for the lounge).
The hall radiator is tuned well down and the room stat took two+
hours to get there and cut out this morning. While building up heat, I
noticed that the boiler was cutting out, but the pump kept going. Is
this detrimental to the pump/boiler?
The options I see (bypassing for now the investigation of window
insulation; this room has three open sides and 10 m2 of windows) are:
- Increase the boiler stat
- Increase the pump rate (not sure if this will heat the lounge
- Increase the room stat setting and let the TRVs sort out the rooms
already well heated. I am concerned about the effect of this on the
pump, given the throttled hall radiator.
How would one start?
- posted 12 years ago