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Have you tried balancing the system should be around a 10 dc drop on the rad flow and returns ?
Discuss Central heating pump sizing in the USA area at PlumbersForums.net
None of the radiators struggle to get hot..they all struggle when the boiler is cycling 5.3 to 5.4..once it settles down, everything is really hot....found a pump on eBay where the wattage is 93W on high compared to 65W on my present one, does that imply it’s more powerful or just uses more power to do the same thing ? don’t want to modify the system....I assume the 30oC Delta T setting can’t be changed, also not sure why it’s there, efficiency or boiler protection thanks
HiThat wattage will be its power consumption, which obviously increases with a more powerful pump and the higher the setting. With 22mm primaries and a larger pump I imagine more problems with boiler delta t.
Hello have TRVs fitted to all rads except the top landing Hall and lounge ( 4 rads ) needs these fully on, works well....don’t think balancing is appropriate.....the rad flow return Delta T, is that the same as across the boiler, effectively, when on heating only ?Have you tried balancing the system should be around a 10 dc drop on the rad flow and returns ?
Hello have TRVs fitted to all rads except the top landing Hall and lounge ( 4 rads ) needs these fully on, works well....don’t think balancing is appropriate.***.the rad flow return Delta T, is that the same as across the boiler, effectively, when on heating only ?
Hiyou should be getting around 15dc split / delta across the flow and return at the boiler
eg
flow 65
Return 50
Hi
get 20-25oC DT when running normally
Difficult to tell, as the temperature falls quickly when the boiler trips, but must be greater than D30oC according to valiant....when it moves from 5.4 to 5.3 hold state, it’s typically around 15-20oC DT but the outlet temperature is only around 60oC on low fire, while it’s on ‘hold’ in its 5.3 state.....would like to know if the 30C DT is for boiler protection or efficiency, can’t seem to find this out, or if the value can be changed..... altered D02 to 10 minutes from 20 minutes to stop it staying in 5.3 so long.....what about when it’s playing up ?
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