surely you can get at the return at the cylinder,if so connect it to there (after the balancing valve if fitted)
Pump over-run - location for by-pass valve
- Thread starter firebladerrw
- Start date
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Thanks but not possible. The pump is in the airing cupboard upstairs, and obviously the by-pass valve has to be fitted after the pump. Problem is, that I cant get to the common return pipe. Its also very tight round about the boiler (under a kitchen worktop).
Having talked to the guys that are doing it, the heating circuit just after the heating zone valve looks favourite to connect the by-pass valve. Because one radiator hasn't got a TRV, then there will always be flow, which will eventually go back to the boiler. Make sense? Its hard to explain on here.
Having talked to the guys that are doing it, the heating circuit just after the heating zone valve looks favourite to connect the by-pass valve. Because one radiator hasn't got a TRV, then there will always be flow, which will eventually go back to the boiler. Make sense? Its hard to explain on here.
But there must be a pipe coming out of near the bottom of the cylinder, usually immediately below the feed from the valve into the cylinder. This is the cylinder return. It connects into the main return after all the radiator returns so will be a suitable connection point.matt1e said:
NO! that is no good. The fact that you have one rad without a TRV is irrelevant. If the heating zone valve is closed there will be no circulation through anything after the heating valve. End of!
The inlet of the valve must be connected after the pump and before any motorized valve. The outlet can be connected into the return from the bottom of the HW cylinder.
PS If your installer is making this type of stupid suggestion, it might be advisable to change your installer.
Sorry I probably didn't explain it properly ?
The inlet of the by-pass valve is connected after the pump, and the outlet is connected after the zone valve, therefore there will always be flow if the by-pass valve lifts as there is one radiator without a TRV. It's working fine and been checked with both solenoid valves closed.
Any clearer ?
Only slight issue is what to set the by pass valve at, trying it at 0.3 for now.
The inlet of the by-pass valve is connected after the pump, and the outlet is connected after the zone valve, therefore there will always be flow if the by-pass valve lifts as there is one radiator without a TRV. It's working fine and been checked with both solenoid valves closed.
Any clearer ?
Only slight issue is what to set the by pass valve at, trying it at 0.3 for now.
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Bit slap dash doing it that way.
Edit: the bypass should be set as required in the manufacturers instructions
Edit: the bypass should be set as required in the manufacturers instructions
trying to tell the op to do what you sugested and move the mag to the rtn pipe. you know it makes sense!
M
mysteryman
Better if you can to use a Y Plan [mid-position] valve and no bypass. You don't want a bypass with a condensing boiler because it raises the return temperature.
Best of all - fit weather compensation with a two position diverter valve, aka W Plan.
Best of all - fit weather compensation with a two position diverter valve, aka W Plan.
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