Advice on wiring when replacing old Central Heating Controll

[markyboy944]

Hi Guys

I have a very old "Landis & Gyr" mechanical Central Heating / Hot Water controller in the airing cupboard, which controls the central heating and hot water, in terms of when they come on, and turn off.

It's become tempremental #(and getting worse), so I think it's high time I replaced it with one of the new digital ones (possibly with wireless thermostat).

I would have attached a photo , but the camera is bust, so bear with me.

My question is >> Where do I learn about the wiring / connections of this device , so I can successfully "swap" it out and replace it for a new device. (Also - is there any other knowledge I need?)

(I'm ok with wiring, having re-wired part of the house etc, but would just appreciate some initial advice).

Anyone able to point me somewhere ?

Many Thanks in anticipation

Mark

 

[gas4you]

Visit the Honeywell UK site. You will find all the wiring diagrams for ch systems on there.

 

[namsag]

The old landis and gear have industry standard back plate .
Look at seimens range of programmers for straight swap with no wiring alterations

 

[markyboy944]

Thanks for the advice. I'll look at those sources.

Mark

 

[bhm1712]

the siemes RWB29 fits directly onto the landis and gyr backplate.

i have a list of programmers that the rwb29 replaces like for like, if you tell me the model of yours i can tell you if the rwb29 fits without mod

 

[markyboy944]

Hi bhm1712

Had a look on the front - no model number at all.

Will it be safe for me to undo the "front" and have a look ? (I guess the model number MUSt be under the face plate of something ?)

Thanks v m

Mark

 

[markyboy944]

Hi ,

Came across the following image of a "Potterton Miniminder" and visually it's exactly the same as mine (apart from mine says "Landis and Gyr" on the bottom left, and has a dark brown fascia plate, however - the actual time clock "wheel" and two stwitches are identical:

(Hope you guys can see this image: )

Untitled

• markyboy944
• 23 Feb 2009
• 1

I google "potterton miniminder" and it seems like its an equiv of Landis and Gyr "RWB2"

Also (for what it's worth) , the actual backplate only occupies the left hand "half" of the unit (i.e. there is nothing behind the right hand half if that makes sense).

Cheers again

Thanks - Mark

 

[bhm1712]

right thats identical to my old landis and gyr controller, mine was an rwb2 with the glow worm mastermind name on it. im 100% sure the RWB29 will be a direct replacement for yours. it will do no harm to take it off and there will be a sticker on the back with the model number just to make sure!

just undo the 2 screws at the top and lift upwards and outwards from the bottom of the controller and it should come right off, your right about the back plate, its just a single DIN so only takes up half

 

[markyboy944]

Awesome - it worked, thanks for the help.

One point (not sure if I should try and post this in an "Advice" section) but the RWB29 requires you to set dip switches for Daily, 5-2, or 7 day programming. No problem thre, HOWEVER the unit only recognised the current dip settings AFTER you press the small recessed "reset" switch on the front.

Thanks again - Mark