Hi,Been to a customer's house who requires their old open vented pumped ch with indirect dhw cylinder converting to a sealed combi system,The old system can independantly heat dhw but ch can only be heated whilst dhw is being heated,looked in the airing cupboard to see if there was any port valves,there was none to be seen,am i right in assuming that there must be a valve under the floorboards somewhere that shuts of ch when only dhw heating is required?
dhw 2 port valve
- Thread starter asp108
- Start date
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If its gravity HW and pumped CH then there may well only be an anti gravity valve preventing rads heating when HW only is selected.
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There might be a gate valve that acts as a summer/winter valve.
But if you are converting the system to a combi should it really matter? Just cap the cylinder primaries under the floor? Possibly with an AAV just above the floor boards.
You'll need to give more info than this though really.
But if you are converting the system to a combi should it really matter? Just cap the cylinder primaries under the floor? Possibly with an AAV just above the floor boards.
You'll need to give more info than this though really.
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