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Transformer with RWG Terminals. Sequence of Operation
HydroTech23
Member Posts: 2
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Comments
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This is an original American Standard Transformer that supplies voltage to the gas valve. I need to replace it but its so old I cant find it.0
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What is the secondary voltage and VA?All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
This is the replacement https://www.supplyhouse.com/Resideo-AT72D1683-Foot-Mounted-Plate-Mounted-or-Clamp-Mounted-120-Vac-Transformer-w-9-in-Lead-Wires-40VA
A close look at the black cover shows 40VASteamhead said:What is the secondary voltage and VA?
Some assembly is required since this is a multi-mount universal transformer.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Why did the transformer fail? Could be old age. OR there could be a failed section of wire insulation causing a dead short. If that is the case, you will be purchasing a second transformer if that short circuit is not corrected before connecting the new one.
Try adding a fuse to the R terminal, then connect the red wire to the other side of the fuse. Like This
I don't really sell these, Just get some fuses and wire connectors from the auto parts store.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Hello @HydroTech23,
Looks like 24 VAC at 10 VA on the cover plate. So a transformer with the same secondary Voltage and the same VA rating or greater should work as long as there is no system defect that cause the original transformer to fail.
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System0 -
for a 24V transformer, chose the fuse (on the low voltage side) with a rating lower or equal to I=VA/24.
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Looks to me like with R<W & G the old one is a fan center with maybe a relay on the other side that is not being used.0
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