Separate CH/DHW Programmer with third "OR'ed" output for boiler

[naffer]

Can anyone suggest a programmer/controller with separate CH & DHW outputs with a third output being an "OR"of the other two.

I am seeking to replace an old Sunvic controller which has/had such an arrangement to drive the boiler on the "OR" output and either the CH or DHW pumps as called for.

I appreciate that all this can be done with Y plans etc but that's a "wet" solution. What I'd like is a "Dry" solution involving a straight replacment of the controller/programmer. For reasons much too boring to go into, I'd rather just replace the controller since the pumps and boiler are A1 and access to the plumbing is limited.

(I'm not being idle, I've spent hours trying to get this info from on-line files where each time I have to download a pdf file and kick off Adobe to look at the schematic of the back plate. There must be expertise in this group that can say, "Try xxxxx")

I think what I want is a set of three "voltage-free" ouputs.

Thanks Naffer

[Chip]

On 27 Apr 2006 11:56:41 -0700,it is alleged that "naffer" spake thusly in uk.d-i-y:

One solution that immediately springs to mind is a pair of 230v coil relays with the NO contacts in parallel (If no equivalent programmer is forthcoming).

Items from

(tinyurl for would seem suitable