- Thread starter Westernr1
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- boiler hot water oil boiler water
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
No diverter valve on that model, it uses a twin pump. Are you in a hard water area? Have you tried turning up the blending valve?
Yes pump is spinning.
Have removed the silver screw on the front and made sure it hasn't siezed up.
Gave it a few turns with a small screwdriver.
All good
Sorry, yes course.......heatstore is hardly hot at all.
Pump is way too hot though when hot tap is run
It's the tank behind the pumps, it stores hot water to generate your actually hot water.
Sorry, yes course.......heatstore is hardly hot at all.
Pump is way too hot though when hot tap is run
Not really, the water temp fluctuates, and when I rotate the blender valve backwards and forwards it does get hot for a while. Which is why I was wondering if it was the blender valve?
The heat store should still get very hot even if blender valve is faulty. Can you switch off the boiler, run off say 20 or 30 liters of HW, shut the HW tap then fire up the boiler and see how long it runs for.
The 35kw boiler must have sent 5.53 kwh somewhere, assuming.iit's to the store then that's sufficient to raise 125L from 25C to 65C . Are you sure the store isn't very hot? The only other route for that 5.53kwh is to the CH?
Can't find a schematic of a Firebird Combi but its probably something like this Grant where the stored water is primary water, might be worth checking the non return valves and that the heating pump isn't running when HW requested. The Grant primary store is 32.5 Litres, total contents 53.5 litres.
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Two pumps = no diverter.
Need to know if rads are getting hot when hot waters ran. If so it's a non return valve.
Need to know if rads are getting hot when hot waters ran. If so it's a non return valve.
I'm attaching a firebird technical update I got some years ago when we were repairing one ,
Seem to indicate heat store should be 78 C also describes how to test thermistors
Seem to indicate heat store should be 78 C also describes how to test thermistors
They claim 120L available at 20LPM at a 40C dT from the 40L primary store (78C) presumably as the boiler will be firing at 35kw output as well.
Any idea of the continuous flowrate at say 40C once the store has fallen to say 50C?, there will obviously be a dT between the PHE and the DHW temperature, is say 16.0/16.5LPM at 40C achievable at a mains/DHW dT of 30C.
Any idea of the continuous flowrate at say 40C once the store has fallen to say 50C?, there will obviously be a dT between the PHE and the DHW temperature, is say 16.0/16.5LPM at 40C achievable at a mains/DHW dT of 30C.
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