WB 18Ri - melting transformers
- Thread starter CMairiD
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Ms "C",
Can you give us details of the installations and anything which might account for this problem?
Its hard to think of any normal fault with a transformer which would cause them to melt.. Much more likely to be an external cause.
Tony
Can you give us details of the installations and anything which might account for this problem?
Its hard to think of any normal fault with a transformer which would cause them to melt.. Much more likely to be an external cause.
Tony
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Don't have the details to hand at the moment, but can look into it today at work and get back to you.
For the most part the WBs we've fitted over the last four years have been rather reliable. However, after the nightmare we had with the early Viessmanns, we are a bit sensitive to emerging trends.
For the most part the WBs we've fitted over the last four years have been rather reliable. However, after the nightmare we had with the early Viessmanns, we are a bit sensitive to emerging trends.
As it happens we had one earlier this week on a 12Ri......10 months old. WB came and fixed it under warrenty and the guy appantly said it was a common problem.
Ideals are well known for the transformers melting since they are under rated for the job...they can't cope with the ambient temperatures, sealed in the pcb casing and are probably undersized. AFAIR when I recently visited CET they had just had a batch of 800 transformers in for the Icos/Isar boards!
IMHO Worcester transformers also run far too hot for long life...have a look at the Ta rating on them.
IMHO Worcester transformers also run far too hot for long life...have a look at the Ta rating on them.
I was told on the CDi training day that most board related problems are actually the transformer
Gasguru,
the transformer in the Icos/Isar pcb box will overheat and fail if there is any increase in output current because there is no protection built into the circuit.
Some of the better designs of PCB like the original Biasi 24S had a PTC resistor is seriew with the primary of the transformer. Any overload and the PTC goes high resistance effectively shutting the system down with an automatic reset if depowered long enough for the PTC to cool down.
Tony
the transformer in the Icos/Isar pcb box will overheat and fail if there is any increase in output current because there is no protection built into the circuit.
Some of the better designs of PCB like the original Biasi 24S had a PTC resistor is seriew with the primary of the transformer. Any overload and the PTC goes high resistance effectively shutting the system down with an automatic reset if depowered long enough for the PTC to cool down.
Tony
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