CH Controller Terminal Identification

[Andy]

It's that time of year when the 3 port valves have to wake from their slumber and mine has developed incontinence over the summer. I have decided to bite the bullet and separate the CH control from the DHW (can only have CH + DHW, not CH on its own). I have worked out the wiring required but am missing one vital piece of info - what function the connectors on the controller are mapped to.

I have a Landis and Gyr controller model RWB252, but I cannot find the installation notes that came with it 10+ years ago. It seem that the domestic controllers side of Landis and Gyr is now in the hands of Siemens Buildng Technology and the data on earlier models is lost. Googling has not revealed the info directly, but I have found other controllers that claim to be directly compatible with the mounting plate. So it would seem that the 6 terminals are as follows:

L = Live N = Neutral

1 = HW off 2 = CH off 3 = HW on 4 = CH on

Can anyone confirm if this is correct (perhaps it might be a standard for this brand of controllers)?

Regards,

Andy.

[geoff]

In message , Andy writes

Is it not on the back of the programmer ?

[John Stumbles]

That looks like a universal backplate pinout. Does the programmer have pins which plug into slit-like sockets on a square plastic frame fixed to the wall, with 2 screws at the bottom fastening the programmer to the plate? The frame being about the size of a light switch plate?

[Andy]

John,

Your description exactly matches the mounting/wiring plate I have. As this info backs up the data I had found else where (for a different controller), I took the plunge and rewired my system over the week end. I am happy to report that it all worked perfectly first time.

Thanks again,

Andy.