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Central Heating controls

n0brain3r

Hi all,

I've a Siemens RWB 29 timer on my boiler. It has separate programs for both heating and hot water. At the moment I've everything wired to the CH terminal so boiler, circulating pump and motorized zone valves all operate on the CH program.

I've switched lives at the timer the boiler, circulating pump and motorized valves.

I'd like to have the following setup CH powers all 3 circuits so providing heating and hot water but that the HW powers only 2 the boiler and circulating pump.

I've been able to get it to function as above but the motorized valves are always powered and are only turned off when the HW program runs and I'd like to avoid this if possible.

The wiring diagrams and manual for the timer are here http://www.leeds.gov.uk/docs/Boiler%20and%20Heating%20information%20-%20siemens%20rwb%2029.pdf

Can anyone suggest a better way to wire it to achieve what I'm after?

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n0brain3r

What does each stat serve?
2 stats one for upstairs and one downstairs

How many zone valves?
3, 2 on the room stats and one TRV type on the cylinder

What does each zone valve serve?
1 upstairs
1 downstairs
1 hot water cylinder(TRV type)

thanks!

2011

How many stats?
What does each stat serve?
How many zone valves?
What does each zone valve serve?

Answer the above and a diagram will be posted by myself or someone else.

Sir Arthur Daley

n0brain3r wrote: »

I just don't like having the stats powered all the time and wasn't sure how electrically safe this was either.

As in room stat and hw stat on cylinder?

n0brain3r

frankmul wrote: »

I think that we need to know how you have the stats and the valves wired. The switch on the valve should bring on your boiler.

For the stats and valves I only have a single wire back at the boiler. I'm guessing this splits and runs via the 2 stats and on to the valves. I've 5 wires at the boiler neutral, live and a switched live to the boiler, pump and stats.

2011 wrote: »

By connecting the stat & zone valves to terminal #1 these devices will only be powered when the HW channel is off. This is not what you want.

I know but it works crudely when the CH program runs the boiler, pump and stats are powered (HW is off) so I have CH and HW and when the HW program runs only the boiler and pump run as the stats are switched off so I have just HW. I just don't like having the stats powered all the time and wasn't sure how electrically safe this was either.

2011

n0brain3r wrote: »

Ok heres the graphic I hope it makes sense!

By connecting the stat & zone valves to terminal #1 these devices will only be powered when the HW channel is off. This is not what you want.

2011

frankmul wrote: »

The switch on the valve should bring on your boiler.

+1
This is a good way of bringing the boiler on.

frankmul

I think that we need to know how you have the stats and the valves wired. The switch on the valve should bring on your boiler.

n0brain3r

Ok heres the graphic I hope it makes sense!

n0brain3r

I'll try get a pic up tomorrow but here the txt of what I did.

I powered the thermostats/zone valves from the HW off terminal and the boiler and circulating pump from the CH on terminal. I then looped the HW on terminal to th CH on terminal. When the cH program runs all 3 are powered but when the HW program runs only the boiler and pump are powered but when CH and HW are off the thermostat/ zone valves s are powered which I wanted to avoid. There's a switch/terminal diagram in the pdf linked above if it helps too

Sir Arthur Daley

n0brain3r wrote: »

I've been able to get it to function as above but the motorized valves are always powered and are only turned off when the HW program runs and I'd like to avoid this if possible.

This is confusing, can you put up a drawing of your installation?