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Honeywell WIFI T-Stat shorting control fuse in cooling mode

dbucciero
Member Posts: 3
I have a hydro air system I installed about 15 years ago I was using a battery operated t-stat therefore didn't need to connect the C wire. With the new stat when I connect the C wire to the B terminal at the AHU (Tran TWE031E-SF-1B) it shorts the control fuse only when the stat calls for cooling . I am using a relay to activate the boiler which is wire from the W at the stat and the B terminal on the AHU. I am also using a aqua stat to delay the fan by connecting it in series with the W from the stat to W2 at the AHU.
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Comments
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Had concerns because it is a two transformer system and was missing the obvious. Ended up being a short between Y & COM in the wall somewhere. Lucky I have a spare wire. Thank you.0
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Bad coil in the contactor isn't uncommon.0
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