Lock out heat strip when on gen power

[switchleg45]

Can the heat strip be locked out when on generator power using 2-pole mechanically held contactor inside AHU?
Configuration: 400A service w/(2) 200A panels...(1) 200A panel will be emergency power panel w/30KW generator.
Upon generator start up would like to lock out just the 10kw heat strips in (2) AHU's but need power to AHU for blower.
Any suggestions?

 

[jcole]

Is there an automatic transfer switch? Is it a permanent install? If not I would just take the side off unit and unplug one wire going to the heaters when I manually applied gen to system. But to answer your question, I dont see anyreason why a contactor would not work but your going to have to fiqure out a way to let the contactor know when the gen is installed/running. You could do this with an aux contact on ats.

 

[LarryFine]

Any suggestions?

Simplest is to use aux contacts on genny to interrupt the 24v control transformer in the air-handler. You can disable the AC compressor the same way.

A bypass can be added for manual reset after shedding other loads if heat or AC are required.