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    Using a 3-port valve in an S-plan system

    Can I use an in situ 3-port valve as a 2-port valve where port B (hot water) is blanked off? I assume that if I simply combine the grey and white wires from the actuator to receive 230V from the CH thermostat, when the CH thermostat calls for heating, the 3-port valve opens to allow water to...
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