combi boiler and indirect tank

[BenC]

ive got a customer who is wanting to keep their indirect cylinder and plumb it into the new combi they have fitted, they are wanting to keep the cylinder just for the sake of the bathroom as they use the bath alot. what im wanting to know is the best way to go about it. any diagrams would be helpfull, cheers ben

 

[quality]

Junk the combi and fit as system boiler

 

[tr7dan]

ive got a customer who is wanting to keep their indirect cylinder and plumb it into the new combi they have fitted, they are wanting to keep the cylinder just for the sake of the bathroom as they use the bath alot. what im wanting to know is the best way to go about it. any diagrams would be helpfull, cheers ben

Dead easy - just take a separate flow and return to the indirect cylinder and use 2 Honeywell 2 port motor valves on the flow pipes. The grey and orange wires of the motor valves connect to the switched contacts on the combi boiler and the live feed to the motor valves can be run through a timer and cylinder stat. Just Google 'S plan' for diagrams.
Swapping the combi for a system boiler is a complete waste of time and money because, guess what, a combi boiler IS a system boiler .... but with some 'hot water making' gubbbins added in as well !

Dan

 

[BenC]

thanks for the advice a sparky will be doing any wireing in of the valves etc. and i dont think they would want to scrap the combi as its fairly new install.

 

[BenC]

the 2 port valves go on the flow for the indirect and the flow for the radiators, is that right?

 

[Centralheatking]

Hooking a combi up in this way is a good system. Hot water for downstairs/basin taps is made by the combi and a cylinder does the bath/shower water - stick an immersion in the cylinder for the summer and you have a good set up which will be quite economical and give good service/flow rates where needed. We have done a few like this over the past 20 years and no come backs.

centralheatking

 

[tr7dan]

the 2 port valves go on the flow for the indirect and the flow for the radiators, is that right?

Yep, if you google 'S plan' you will get both piping and wiring layouts

cheers

Dan

 

[stevetheplumber]

just remember to use the auxilary switch wires grey and orange usually to switch the boiler

 

[BenC]

i could i not just use a 3 port valve and tap into excisting flow pipe, if you get what i mean. would save the cost of an extra 2 port valve.