my house has a 12 year old system (i moved here just under 3 years ago). it consists of:
potterton profile 80e boiler
no roomstat (trvs on every radiator)
fully pumped
2 motorised zone valves
open vented
storage tank with coil inside for hot water
it basically works, but a few things have been bothering me:
1 the pump overrun can last for as long as 30 minutes. i measured the length of the overrun circuit and it is 2.9m. the boiler installation instructions say it should be a minimum of 4m. i've removed all lagging from the overrun circuit and set the differential valve at 0.15bar. grateful to know whether this sounds right, or if there is any other way of reducing the duration of pump overrun.
2 the boiler overheat stat will trip when the main stat is set at 4.5 or higher. do you think is it worth replacing the overheat stat?
3 lastly, the lack of room stat has always niggled me. at the moment the pump runs for as long as the heating is on, which causes the boiler to cycle roughly 1 minute on/4 minutes off throughout the evening. would fitting a room stat override this? i know you're not meant to fit a room stat and trv in the same room but, if the trv is set to maximum (or even slightly loosened) i don't think it would interfere with the room stat.
i'd be delighted to get an expert's view on any of the above!
potterton profile 80e boiler
no roomstat (trvs on every radiator)
fully pumped
2 motorised zone valves
open vented
storage tank with coil inside for hot water
it basically works, but a few things have been bothering me:
1 the pump overrun can last for as long as 30 minutes. i measured the length of the overrun circuit and it is 2.9m. the boiler installation instructions say it should be a minimum of 4m. i've removed all lagging from the overrun circuit and set the differential valve at 0.15bar. grateful to know whether this sounds right, or if there is any other way of reducing the duration of pump overrun.
2 the boiler overheat stat will trip when the main stat is set at 4.5 or higher. do you think is it worth replacing the overheat stat?
3 lastly, the lack of room stat has always niggled me. at the moment the pump runs for as long as the heating is on, which causes the boiler to cycle roughly 1 minute on/4 minutes off throughout the evening. would fitting a room stat override this? i know you're not meant to fit a room stat and trv in the same room but, if the trv is set to maximum (or even slightly loosened) i don't think it would interfere with the room stat.
i'd be delighted to get an expert's view on any of the above!