It is stalled in the mid position by applying a rectified AC voltage to the motor; but when it is in the CH position the motor is continually running to keep it there. Presumably that was the only way of guaranteeing that the valve completely closed the HW port. A slight error in holding in mid position would not be too important - as long as both ports were open. The motor draws about 6 watts, which means it will get hot. Some heat will be transferred through the pipes to the valve.
Banging from Motorised Valve
- Thread starter andymck
- Start date
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This appears to be the case all the time the valve is in the CH position the motor is trying to turn even when the heating timer is off during the day?! Sound right? Seems a bit of a waste of energy. Thanks for the prompt and reassuring reply.
It's one of the flaws in the design of the mid-position valve. You don't have this problem if you fit separate zone valves in the HW and CH circuits.
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