"Dave Plowman (News)" wrote in message
...
In article ,
John wrote:

"sarmavsn" wrote in message
s.com...
Dear All,
I had a Honeywell room thermostat which controlled the Alpha Combi
boiler in the loft.
I tried to replace it with a Drayton Digistat 3. It did not work.
Can any one please expalin what is the meaning of the terms, call for
heat, satisfied etc?
What do thes wires do in real terms? When I put an ohm meter across the
three terminals of the digistat, nothing happens as the programme calls
for heat. Does this work by connecting terminal 1 to 3 or does it send
a voltage signal?
Can some please explain how the system works?
thanks
sam

I think the best option would be to put your new Drayton Digistat 3 on
Ebay or get a refund and get one of these
http://www.alpha-boilers.co.uk/index.asp?wpid=109 which is specifically
designed for Alpha boilers. I've got one and it's absolutely brilliant.

The one it's replacing doesn't seem to have been a 'special'. What's so
different about Alpha boilers?

--
*Puritanism: The haunting fear that someone, somewhere may be happy.

Dave Plowman London SW
To e-mail, change noise into sound.

The thermostat is a changeover switch. The live feed is switched to "Call
for heat" when the room is below temp and to "Satisfied" when it hits the
temp. Therefore the call for heat needs to be connected to the pump / boiler
..