On Thu, 31 Jul 2003 20:28:44 +0000 (UTC), "Simon Stroud"
wrote:




I have an Eco Hometec badged (MAN Micromat) combi boiler in the garage. This
has built-in frost protection based on the outside temperature (it has a
sensor for this) and the return water temperature.

I originally planned to add an external frost thermostat for additional
protection, and got the bits. However I haven't connected them up yet,
mainly because the boiler doesn't actually have a direct "CH demand" input
that I can see - their engineer said I could short out the outside
temperature sensor and this would make the boiler think it was minus XX
degrees and would force it into firing mode.

You don't need to do that, although I agree it would work.

Have a look at the MHS Boilers web site and download the installation
guide for the Strata 1. It will seem quite familiar but rather
better. There are some scenarios of different plumbing hookups
(most for small commercial use, some for domestic), and there are also
wiring diagrams.

Depending on what you have in terms of controls, the inputs and
outputs behave differently. For example, the CH demand inputs can
either be for a room thermostat or a temperature sensor.
The point is that you have to select the correct function code for
this and for the operating temperatures. This can be reached via
the engineer's menu. I presume you know that this can be reached
using access code 21. The functions are better described in the MHS
translation.





..andy

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