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- 14 Feb 2004
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Could anybody help me out on how to change the 3 port mid-position valve MAV-322 (Landis & Gyr)? The valve has failed. I've replaced the motor but the microswitches have now failed. What brand / make shall I replace it with. I have a look at the Honeywell v4073. How do I drain the heating system to fit it? I have a standard heating system, Ideal Standard boiler and water tank in the cupboard. In the cupboard next to the tank is the pump and valve. The pump has 1 pipe going into the valve. The top of the tank has a pipe coming out, that then goes into the top of the valve and the bottom goes into the floor. The pump has a stop valve on it. The bottom of the tank has a pipe going in with a gate valve.
I hope that has described it! Any help much appreciated. Thanks.
I hope that has described it! Any help much appreciated. Thanks.