"Ed Sirett" wrote in message
news
On Thu, 06 Jan 2005 22:06:33 +0000, andrewpreece wrote:


p

Has your filling loop been removed? They are really supposed to be
removed
once you've topped up the system. There will still be a connection point
on
the coldwater pipe and the CH return ( or flow? ). Some combis have
built in
filling loops: my Vaillant has two valves built into the underside of
the
casing, it takes two special little keys to open or shut the valves.
It's
all very inconspicuous.

You must have a Eco/Turbomax/Thermocompact Plus model. About 5 years old
or less.
The OP has something from about 10-20 years ago.

Yes, that's right, it's a Turbomax. Ed, we talked a while back when I was
concerned that the HW from my Turbomax was hotter than I had it set when I
installed it, yet I hadn't touched the HW temperature control: I was miffed
because the Turbomax gives the impression from the display that the HW can
be set to an exact temperature. I spent an entire day faultfinding and
decided something must be broken, but I've come to the conclusion it's OK
after all. I reckon the Turbomax only controls the CH loop temperature, and
the HW temperature is determined by both the CH loop temperature and the
temperature of the water as it enters from the ground.
When I was concerned about the HW being hotter than I'd set it, a few
months back, the ground-water temperature was 16C, about as warm as it gets!
I shall have to twiddle the dial a few times a year to keep the HW
temperature constant at the taps, but that's no big deal, now that I know,

Andy.