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Is there such a thing a residential HVAC (gas heater) unit that does not have anyother fuses other than the Circuit *
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Why would you want a unprotected low voltage side
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I have an older gas furnace (Trane 1989 vintage) that does not have any fusing for the low voltage control board. Older boards were not as processor/IC oriented long ago. But today most all have a fuse to protect the control board. However what they do not usually have is any protection for induced current spikes from lightning on the thermostat/control wiring.
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