When any thermostat temperature drops below set point, the respective zone valve will open, activating a switch within the zone valve. This turns on the circulator providing flow through each respective loop.
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When any thermostat temperature drops below set point, the respective zone valve will open, activating a switch within the zone valve. This turns on the circulator providing flow through each respective loop.
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pfffft zm 12 . nowt new . Get them from Watts