Biomass domestic boiler issue

mountfarm

Member
Got a heat exchanger plumbed in a house which is fed directly from the biomass boiler. The flow pipe is hot and return pipe is warm so we are getting heat into the house. However there doesn’t seem to be enough heat being utilised as the house is just luke warm.
if we put the motorised valve into manual then we get more heat in the house but then the return pipe is also red hot so we are sending heat back to the biomass boiler. Our plumber who fitted and knows this stuff is not contactable so anybody seen this before.
The motorised valve seems to be working in auto as it opens and shuts but we don’t seem to be getting the full heat into the house.
Checked radiators for air etc and they are fine as it’s also luke warm in the shower/baths.
 

Still Farming

Member
Mixed Farmer
Location
Glamorgan Wales
Lots of questions possibly?

Have you had work or replaced anything with the system recently?

Is biomass boiler lit and upto temp. 70 oC + or more?

Is Accumulator tank upto temp?

Are all pumps on and flowing ok?
How old is system?

What type of heat exchanger do you have?
Remember you never get the boiler temps in your house through the heat exchanger, think 60 to 70% generous possibly?
Is anything different recently or just happened?
 

mountfarm

Member
Lots of questions possibly?

Have you had work or replaced anything with the system recently?

Is biomass boiler lit and upto temp. 70 oC + or more?

Is Accumulator tank upto temp?

Are all pumps on and flowing ok?
How old is system?

What type of heat exchanger do you have?
Remember you never get the boiler temps in your house through the heat exchanger, think 69 to 70% possibly?
Is anything different recently or just happened?

No
Biomass kicks in at 65 and kicks out at 87
No accumulator tank - direct feed as the boiler has an auto fuel feeder so runs as soon as it hits 65.
Yes
2 yrs old
Nordec tec plate 32-20
 

mountfarm

Member
So all working ok upto today was it?

I’m not in the house and the person who is has said a few days but I’ve discovered about putting it in manual today.
It’s 17 degrees here today but I can tell come winter time it’s not going to be efficient unless run in manual which we can of course do, but sending heat back to the biomass boiler isn’t ideal!!
 
Last edited:

f0ster

Member
I presume the heat exchanger is a plate heat exchanger (phe) these have a hot end and a cool end so the flow has to be in opposite directions if you know what I mean, what has changed recently, anything? you should have a pump on both sides of the phe, one to feed the phe and the other to take the heat from the phe to the property, are these both working, put your ear right up close to see if it is turning or just humming, these phe can be prone to block up internally especially if you do not have a magnetic filter fitted, we usually remove them and fill them with hypochlorite for a couple of hours then pressure wash them out, do not leave the hypo in too long, it attacks the brazening,
 

rollestonpark

Member
Arable Farmer
Location
Burton on trent
Got a heat exchanger plumbed in a house which is fed directly from the biomass boiler. The flow pipe is hot and return pipe is warm so we are getting heat into the house. However there doesn’t seem to be enough heat being utilised as the house is just luke warm.
if we put the motorised valve into manual then we get more heat in the house but then the return pipe is also red hot so we are sending heat back to the biomass boiler. Our plumber who fitted and knows this stuff is not contactable so anybody seen this before.
The motorised valve seems to be working in auto as it opens and shuts but we don’t seem to be getting the full heat into the house.
Checked radiators for air etc and they are fine as it’s also luke warm in the shower/baths.
sounds like the motorised valve is opening properly when done manually, but not when in auto.
When in manual sounds like too faster water flow from boiler. You need to slow the pump down, or restrict it on a ball valve or something. So that the return is about 60 (+-5).

If its 1 of those domestic honeywell motorised valves, I have had them eat the teeth off inside. They are pretty poor I think (like most honeywell stuff).
Chris
 

CHAP Webinar - Innovative tools to overcome the challenges of Regen Ag

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