Generac (OPCB) set up?? - Electrician Talk - Professional Electrical Contractors Forum
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Old 02-02-2015, 06:56 AM   #1
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Default Generac (OPCB) set up??

Getting ready to set a Generac 22KW air cooled gen. set with a RTSY200A3 transfer switch. I've also purchased their PMM starter kit (24VAC) and one additional PMM (24VAC).

The house has two Bryant split heat pump systems, one 1st floor with 15KW supplemental heater and one on 2nd floor with 10KW.

I would like to set up the (OPCB) on the transfer switch to shed the 2nd floor system first and the first floor system second in the event of a generator overload.

Just want to know the best wiring method to accomplish this.

Thanks for any help you can provide.

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Old 02-02-2015, 07:05 AM   #2
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PMM's are only good for 50 amps. Be wary of how the heat strips are controlled. I found out on one job that I had to add a tdr relay because the furnace had a thermal relay controlling the heat. So even though I had broken the low voltage wire to the heat strips, the heat would still come back on after an outage on the generator unless I held up the transfer for a minute.
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