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Overload Protection for Air Handlers #209973
05/20/13 01:26 AM
05/20/13 01:26 AM
BigB  Offline OP
Joined: Mar 2004
Posts: 725
Tucson, AZ USA
In the Southwest virtually all 120 volt air handlers are plug and cord connected. For years we installed one of these:[Linked Image]

With all the newer units having built in motor overload protection it is my understanding that the fused receptacles are no longer needed/required. I believe this is also true of evaporative coolers.

Anyone have any input on this?

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Re: Overload Protection for Air Handlers [Re: BigB] #209979
05/20/13 09:28 AM
05/20/13 09:28 AM
HotLine1  Offline

Joined: Apr 2002
Posts: 6,935
Brick, NJ USA
Here furnaces and air handlers are hard wired; OCP is the branch circuit breaker and/or internal from the mfg.

Re: Overload Protection for Air Handlers [Re: BigB] #209981
05/20/13 10:31 AM
05/20/13 10:31 AM
ghost307  Offline
Joined: May 2005
Posts: 934
Chicago Illinois USA
A lot of the furnaces in the Midwest have a similar device to the picture, but with a switch instead of a receptacle and the furnace itself is hardwired. A service tech told me that's so he can unscrew the fuse for LOTO instead of just hoping that the homeowner doesn't turn the c/b back on.

Re: Overload Protection for Air Handlers [Re: BigB] #210075
05/25/13 02:30 PM
05/25/13 02:30 PM
harold endean  Offline
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
In a lot of the older homes around here, they used to use them for furnaces and boilers as well. Usually the service was 100 amp and fuses.

Re: Overload Protection for Air Handlers [Re: BigB] #210091
05/26/13 03:09 PM
05/26/13 03:09 PM
renosteinke  Offline
Cat Servant
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I've installed a few of those, as a way to give the equipment more appropriately sized over-current protection. I'd use an Edison-base breaker, rather than a fuse. Only problem is ... they didn't work out.

They didn't work out, as the first thing the HVAC guy did on his next visit was remove them, leaving an open box in place.


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