"Valve went wrong so not being a plumber bought what looked like exactly the same valve for ease of installation
Fitted it no probs with the actuator arm in the same place as the old one.........heating worked in reverse.....turned on central heating,got hot water etc etc The Problem?. I had fitted it upside down as valve looked the same but model changed. For the plumbers out there A and B flow reversed from old model.It is marked up correctly but being an amature didnt look.....my fault entirely"
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Review 3 for Horstmann Z322 3-Port Motorised Valve
"I bought this Z322 diverter as it was advertised as a direct replacement for the F322 enabling the control box to be swapped without changing the valve body. This is NOT possible. The valve body design is completely different and there is no detach button like on the previous model. You cannot fit the Z322 control box to a valve body F322. So now I have to drain the system down can fit the valve body with all the hassle that involves. Not at all impressed."