WebMay 28, 2024 - Wiring for a 2 port valve and high limit thermostat when installing an unvented hot water cylinder on a Y plan heating system. May 28, 2024 - Wiring for a 2 port valve and high limit thermostat when … WebHeating active. When heat is required (zone 1 in this diagram), the thermostat contact closes, which connects 230V to the output terminal 3. This is connected in the wiring centre terminal 7 to the zone valve, so …
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