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Old system time clock help please?

View the thread, titled "Old system time clock help please?" which is posted in UK Plumbers Forums on UK Plumbers Forums.

arran197

Gas Engineer
My in-laws have an old Ideal Mexico Super 2 floorstanding open flued boiler. It old, the system is pants. It's a gravity hot water, 28mm circs up to the tank in the loft. Pumped heating, which looks like it is one pipe. Heating gets 'warm' at best, hot water is no problem.

As a result of this old crap that is fitted, during the winter months the heating takes a while to get the house up to a temperature that makes you want to get out of bed in the morning. So it would be a good idea to set the time clock. However, it doesn't work, has never worked and I'm not sure what I will need to do to get it to work. The room stat doesn't work either. To put the heating on it is a simple, fuse spur on, heating off is fuse spur off. The clock comes on and you can select everything, it just doesn't control the boiler.

The current clock is a twin channel Grasslin. Stat is a Honeywell.

My personal feeling is that, due to the fact there is no control over whether the boiler operates on heating or hot water, (it's either both off or immersion for water only), that the twin channel clock is wrong and it should have a single channel clock as per combi boilers.

There are about 8 different wire going to the clock, I'm guessing 2 from the live and neutral, 3 from/to the boiler, 2 from the stat and earth?

Any help with what I need to do? Not very good with wiring tbh.

Thanks, Arran.
 
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usual method of controlling this set up is two channel clock set so that you cant select heating only
ho water on sends juice to boiler heating on sends juice to pump via the room stat
there is no cylinder stat as there is no way to close that cicuit often there was a citrol valve on the return from cylinder
you say this system id pants and it probably is by todays standards but it probably been there 30 years without much maintainence how many of todays boilers will be working in half that time ?
 
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Yes, you are right, when it was installed it was probably the dogs dangleys, but now could do with being updated. So what do I need to do with this wiring exactly?
 
Yes, you are right, when it was installed it was probably the dogs dangleys, but now could do with being updated. So what do I need to do with this wiring exactly?
i would think it needs to have a new programmer and wired by someone who has a clue
plug to clock
hot water "on" terminal to boiler
heating "on" terminal to room stat
room stat to pump
all the neutrals together
all the earths together probably the easiest system ever
 
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Ye, thanks for that Steve. Unfortunately I'm only 22 and as a result, experience isn't something I have in bucket loads. I don't know much about electrical work either, so an old system with an electrical problem on the time clock is not my strong suit. I will have to look in to it further and hopefully if it works, improve my skills so that in 20 years time I can tell people how easy things are.

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inlaws and relatives are not the best people to practice with if it all goes **** up youll hear the story every x mas for the next 30 years belive me i know
 

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