I have a Glow-worm 38cxi combi boiler (very happy with it by the way) and
I've decided to install a programmable thermostat. The one I've decided on
is the CM67 RF NG, not least because of the good reports it gets on this
Now, the installation guide for the CM67 relay (HC60NG) is a bit sparse.
Basically the mains wiring is OK, but it shows 2 wires leaving the relay
going to a symbol which I take to mean the boiler to 2 switches marked T1
and T2 as follows...
HC60 A B C D E
BOILER T1 T2
But on the diagram there is a little picture showing switching between A and
B and A and C...
| / \
A B C
So T1 on the boiler A can be connected to B or C either of which is directed
to T2 on the boiler.
This text is also printed on the picture...
A-B:10(3)A 0..30 deg C / <8(3)A 0..40 deg C
Now I have a couple of questions.
1) The 38cxi boiler doesnt have any switches labeled up as T1 or T2. The
installation guide shows a programmer/thermostat only connecting via 1 wire
in the central position of a 3 way block for mains voltage connections. I
assume the HC60 is a mains voltage controller. What wires do I need to
connect from the HC60 to the 38cxi?
2) What switch setting is required between A and B or C within the HC60?
Any help would be gratefully received.
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