Dear all,
My Rayburn (with a 36Kw Net Honeywell burner) seems to cut in and out very often, even when heating up. It heats up a pressurised cylinder up stairs and a lot of radiators (14 - but half of them are valved out). I've taken some basic measurements and have deduced that the control valve to the hot ware circuit doesn't really stay open for very long as the cylinder is well lagged - so the problem is down to the central heating circuit.
The pressurised cylinder is very new, but the rest of the system is as we bought the house a year or so ago, and as recently been dosed, but there is a known leak (under the floor somewhere I think). The burner cuts in for a minute then out and will do this all evening - I don't think it is correct.
I can think of a number of reasons but can't really get to the bottom of it
a) the heat exchanger in the boiler is crapped up (but it has recently been serviced by the Rayburn man - no adverse comments about it, and also dosed by the plumber that did work for our extension
b) the pump speed (three speed adjustable) is not set at the correct speed, but
c) the boiler is too overpowered for the number of radiators (given how many are valved out as they're in redundant rooms - i.e the garage!)
d) the system is so crapped up that it doesn't hold much water and can heat it up so quickly. We do live in a hard water area, and due to the leak it must be topped up regularly - but does the circuit get hot enough to give deposits?? This I don't know about. We do have a water softener, I can test if it is NOW plumed (via the filling loop) into the softener - but I don't know historically if it has been, or even if it should be?
e) there's a problem with the hysteresis of the thermostat and it cuts out way too cold, or cuts in way too hot
f) Arrrgh
Is there anyone out there who has had a similar problem?
Nozzle
My Rayburn (with a 36Kw Net Honeywell burner) seems to cut in and out very often, even when heating up. It heats up a pressurised cylinder up stairs and a lot of radiators (14 - but half of them are valved out). I've taken some basic measurements and have deduced that the control valve to the hot ware circuit doesn't really stay open for very long as the cylinder is well lagged - so the problem is down to the central heating circuit.
The pressurised cylinder is very new, but the rest of the system is as we bought the house a year or so ago, and as recently been dosed, but there is a known leak (under the floor somewhere I think). The burner cuts in for a minute then out and will do this all evening - I don't think it is correct.
I can think of a number of reasons but can't really get to the bottom of it
a) the heat exchanger in the boiler is crapped up (but it has recently been serviced by the Rayburn man - no adverse comments about it, and also dosed by the plumber that did work for our extension
b) the pump speed (three speed adjustable) is not set at the correct speed, but
c) the boiler is too overpowered for the number of radiators (given how many are valved out as they're in redundant rooms - i.e the garage!)
d) the system is so crapped up that it doesn't hold much water and can heat it up so quickly. We do live in a hard water area, and due to the leak it must be topped up regularly - but does the circuit get hot enough to give deposits?? This I don't know about. We do have a water softener, I can test if it is NOW plumed (via the filling loop) into the softener - but I don't know historically if it has been, or even if it should be?
e) there's a problem with the hysteresis of the thermostat and it cuts out way too cold, or cuts in way too hot
f) Arrrgh
Is there anyone out there who has had a similar problem?
Nozzle
