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Old 07-30-2020, 04:57 PM   #1
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Load Shedding A/C from Generator


Apologies if this is not the correct forum for this.

I recently had a whole home 22kw Generac installed along with an ATS that has built-in load shedding (SACM) capabilities.

The wiring diagram states to interrupt the wire from the furnace/ thermostat to the outdoor unit and run it to the SACM. Essentially the SACM provides an N/C contact to delay the A/C startup a set amount of time upon transfer to the generator at utility power loss.

My unit is a Trane TEM6A, heat pump 4TWR7 & heater BAYHTR series using an XL824 thermostat.

Could anyone confirm which wire/ color would be the correct choice to run to the SACM?
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Old 07-30-2020, 05:32 PM   #2
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Re: Load Shedding A/C from Generator


Y terminal wire.
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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 07-30-2020, 08:40 PM   #3
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Re: Load Shedding A/C from Generator


I run a wire to the air handler and interrupt the red wire, shut it all down.
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Old 07-31-2020, 05:04 AM   #4
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Re: Load Shedding A/C from Generator


Break the red wire(RC/RH) on a heat pump with electric aux heat.
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