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Replies: 14
Views: 3,384
Posted By 2john02458

May also need a zone control panel or relay to...

May also need a zone control panel or relay to manage the pump. Otherwise how to keep pump from running against 2 closed valves when no heat call from either zone.
Replies: 14
Views: 3,384
Posted By 2john02458

The zone valve will prevent back flow. The pipe...

The zone valve will prevent back flow. The pipe in the inactive zone adjacent to the merge may get slightly warm due to conduction but not enough to worry about.
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