Heating on with water

ollie3686 · 19 Feb 2011

Some of you may remeber but I recently replaced my Danfoss Randall RMT230 thermsotat with a Honeywell CM907 programmeable thermostat. I wired it up correctly (so i thought) but the other morning i noticed the radiators were hot, when only the hot water was on, the thermostat was only set at 5.

The programmeable thermostat is connected to the programmer (Danfoss CP715). My programmeable thermostat is set at 5 degrees overnight and when we are out (raising it in the morning). The heating on the programmer is constantly set to on. The hot water is on a timer.

Can anyone help?

Thanks

45yearsagasman · 19 Feb 2011

After you fitted your new clock,did it work ok at any time? Have you any motorised valves fitted to your system?

bengasman · 19 Feb 2011

First thing to check is the settings of the timer, followed by the valves.

ollie3686 · 15 Mar 2011

I know it's taken a while to respond but any further help would be appreciated.

My timer settings are rather limited. The heating is set on constantly (with the programmeable thermostat controlling the heating in theory) and the water is set on at different times of the day.

As far as i can see we have one valve on the system. It's in the airing cupboard and is a Danfoss Randall Type HSA3. There's a lever on the top which can be switched to either automatic or manual. Ever since i moved in it's been on automatic but i've moved it to manual to see if that makes any difference, but it doesn't appear to.

Any ideas?

45yearsagasman · 15 Mar 2011

You have a 3 port valve and there should be a wiring centre close by.
When you have timer on HW only there should be 230v on the orange wire only.You can check this with a meter.You should also check that the 3 port valve spindle is not siezed and not returning to the HW position.(it does this by spring return)The head is easy to remove(2 screws).Those valves are renowned for sticking.

ollie3686 · 15 Mar 2011

Ok. Where should i start. I'll set it to HW only and see. But i don't have a meter to test this, is there another way? By removing the screws can i easily tell whether it is siezing? Sorry to be a pain but i'm very naive with this.

Thanks

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Heating on with water

ollie3686

45yearsagasman

bengasman

ollie3686

45yearsagasman

ollie3686

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