Balancing and zones

[plumbinguser]

Hi

I have been reading the forums and believe that I understand how to balance a single system.

I have two zones on the central heating, one for downstairs and one for upstairs. I have these coming on together in the morning but after that they are timed for different times.

The question is do I balance the zones individually or both together (as forums usually say to find the nearest and work away from it but as zones seperate I am not sure).

 

[payney1974]

i would balance with both zones on

 

[migoplumber]

all zones open and calling for heat when balancing - that means trv's as well , so best to do from cold

 

[plumbinguser]

Thankyou for the information.

I will open up fully on both sides and call for all heat (except hot water) and then run around and see which order they heat up in (hopefully before they all have)

 

[doitmyself]

How to balance a CH System

You should have an Automatic Bypass valve. There may be one in the boiler, if not it should be after the pump and before the motorized valves.

 

[plumbinguser]

Thank you for the info, not sure what the Automatic Bypass valve is so will have to check the boiler as there is none elsewhere

 

[doitmyself]

Which make and model boiler do you have?

If you have an external bypass valve, there will be a pipe teed off after the pump and before any motorized valves which connects the flow to the return. This will have either a gate valve on it or a valve with an adjuster and a numbered scale (this is the ABV).

PS The bit underlined in my last post is a link to balancing instructions.

 

[plumbinguser]

Hi

Its an EcoTec Plus 637 condensing bolier. The pump and boiler asre combined.

I have followed the link and saved the instructions for use later.

Thank you

 

[doitmyself]

Its an EcoTec Plus 637 condensing bolier. The pump and boiler are combined.

This boiler has an internal by-pass. Adjustment instructions are in the Installation Manual on page 32.

 

[plumbinguser]

Thank you, I can see it on the drawing. I presume I just leave this as it is as the balancing link you provided just says to set as per manufacturers instruction (may be a daft question but what exacly does it do?)