Hi all,
Apologies if I sound like a div writing this but, having followed the FAQ from this site, and read several times a couple of other articles on balancing, I am a bit stumped as to how to progress.
Q's:
Question 1 is regarding a condensing boiler not holding a constant CH temp during balancing.
Question 2 is regarding the drop required (I have it in my head 12C but read an article suggesting that condensing boilers need to be 20C - or is it just the diff between boiler flow and return temps?)
Scenario:
I have a detached 60's house with 5 rads downstairs and 4 upstairs. Boiler is a Vaillant ecoplus 428 with output set at 80C. Using a TPI 343 diff thermometer (as recommended in other posts on this site) to measure drop across the rads, but cannot get a temp diff that holds/is reliable/repeatable. Seems the diff is constantly changing, whether boiler is firing or "modulating"/cycling (?).
Questions:
Q1: Seems to me, to do the rad balancing, I need to have the boiler push 80C CH around until the thermostat says to stop (which, when balancing, will never do) - does that sound right?
If so, any ideas how to get my boiler to do that (i.e. just keep CH at same temp)?
Q2: what is the ideal drop for my boiler?
Any help very much appreciated - I'm struggling big time...
NB
Apologies if I sound like a div writing this but, having followed the FAQ from this site, and read several times a couple of other articles on balancing, I am a bit stumped as to how to progress.
Q's:
Question 1 is regarding a condensing boiler not holding a constant CH temp during balancing.
Question 2 is regarding the drop required (I have it in my head 12C but read an article suggesting that condensing boilers need to be 20C - or is it just the diff between boiler flow and return temps?)
Scenario:
I have a detached 60's house with 5 rads downstairs and 4 upstairs. Boiler is a Vaillant ecoplus 428 with output set at 80C. Using a TPI 343 diff thermometer (as recommended in other posts on this site) to measure drop across the rads, but cannot get a temp diff that holds/is reliable/repeatable. Seems the diff is constantly changing, whether boiler is firing or "modulating"/cycling (?).
Questions:
Q1: Seems to me, to do the rad balancing, I need to have the boiler push 80C CH around until the thermostat says to stop (which, when balancing, will never do) - does that sound right?
If so, any ideas how to get my boiler to do that (i.e. just keep CH at same temp)?
Q2: what is the ideal drop for my boiler?
Any help very much appreciated - I'm struggling big time...
NB