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Posted by Paul on December 04, 2008 at 08:17:44:
Having just fitted my HW/CH system with new programmer and 3 port valve( honeywell V4073A fitted on the flow) all working fine, except I get bad cavitation noise inside the 3 port valve when it is in the AB mid postion feeding both HW and CH. I have tried turning down the speed of the pump (which is on the return) and this does help, except it is not strong enough at low speed to pump to upstairs rads.
What can i do to stop the cavitation inside the valve
All is fitted correctly according to specs.
Is the valve faulty? is it the wrong type? Does the pump need to be on the flow?
Do I need a valve with a higher differential pressure?
any help welcome please.
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