Temp sensor Q- for the experts.
- Thread starter bster
- Start date
Agile - I'm asking for no particular reason, I just want to start understanding boilers more in depth. My mission this year is to learn the basic elctrical test that can be performed on various parts to id faults, but to do this obviously you need to know the exact functioning of each individule part and not just the basic ignition sequence.
I'm sure that with help of the diynot'ers that i'll be an expert in 12months!
I'm sure that with help of the diynot'ers that i'll be an expert in 12months!
Although people test ntcs they sometimes just need a clean, but sometimes fail intermitently, not when u testing . Cheap part on the whole, if in doubt change.
If there are2 the primary one has the hard life.
If there are2 the primary one has the hard life.
Look at the curve for the Biasi prisma - in the MI, which gives typical resistance for an NTC.
Get yourself a couple of "pots", 10k ohm, pcb mounting (so they have thin legs) which you can poke into the connector to similate a hot/cold boiler as you wish.
You disconnect the connector from the boiler's NTC which you leave in place - to measure its resistance.
They can be hard to get a spanner on - a cheap set of Melco or similar box spanners is worth having.
Get yourself a couple of "pots", 10k ohm, pcb mounting (so they have thin legs) which you can poke into the connector to similate a hot/cold boiler as you wish.
You disconnect the connector from the boiler's NTC which you leave in place - to measure its resistance.
They can be hard to get a spanner on - a cheap set of Melco or similar box spanners is worth having.
"""to id faults, but to do this obviously you need to know the exact functioning of each individual part and not just the basic ignition sequence."""
The operation of the NTC in a boiler is quite a complicated situation because it depends on the system water flow, control circuit interpretation of the restance value amd lastly the NTC itself.
The two most common faults are the NTC itself as its subjected to severe thermal cycling and the system flow as thats dependent on the pump and any blockages.
Its not easy to test an NTC in circuit unless you use a variable resistor to simulate the NTC while you measure the fitted NTC.
Tony
The operation of the NTC in a boiler is quite a complicated situation because it depends on the system water flow, control circuit interpretation of the restance value amd lastly the NTC itself.
The two most common faults are the NTC itself as its subjected to severe thermal cycling and the system flow as thats dependent on the pump and any blockages.
Its not easy to test an NTC in circuit unless you use a variable resistor to simulate the NTC while you measure the fitted NTC.
Tony
modern Alphas prove the pump by monitoring rate of change of primary ntc. Possibly Buderus regular boilers also. Not aware of any others.
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Some have 4 (older Worcester Highflows etc) ...
DHW Stat.
CH Stat.
Primary water overheat stat.
Safety cutout stat on primary heat exchanger. If this one trips so does the pilot requiring a manual relight.
DHW Stat.
CH Stat.
Primary water overheat stat.
Safety cutout stat on primary heat exchanger. If this one trips so does the pilot requiring a manual relight.
Paul Barker said:
Gloworm, Vailliant and the new Vokeras do to Paul. Thus making it imperitive to have a clean system to install them on.
Ive known a Glowworm be nightmare as it was installed on only 2 small rads and towel rail. It kept coming up with a pump error code as it just couldnt get the heat out the boiler quick enough.
flue stat is another one to throw into the works.............
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