AHU disconnect mount above ceiling

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Sparkfromtex

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I have a job where the ahu closets are too small to mount the disconnect beside the unit in the closet. The only place I can mount the disconnects are above the grid ceiling on the a/c duct work right in front of the closet. if I put a sign on the unit and the ceiling, showing where the disconnect is mounted is that a legal installation. Also what about mounting the disconnect to the duct work? I don't find anyting in the code book about that.
 
You have to follow;

440.14 Location.
Disconnecting means shall be located within sight from and readily accessible from the air-conditioning or refrigerating equipment.

The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment.

The disconnecting means shall not be located on panels that are designed to allow access to the air-conditioning or refrigeration equipment or to obscure the equipment nameplate(s).

Rick
 
The closet is too tight to get a disconnect on the side of the unit or on the wall inside the closet, and all that is exposed on the front of the unit is removeable service panels. Above the ceiling is not redily accessible, and the AH unit does not have an internal breaker where can the disconnect be mounted to satisfy 440.14?
 
I don't think 440 applys to a AHU if it does not have the compressor in the unit. See 440.3(B)

so either 422 or 430 applys.
if 422 applies then a simple single, two pole or 3 pole, switch could be used as the disconnect?, I also see no requirment in 422.32 for it to be readly accessable.
 
That might can be done, but it will be hard to make a solid installation that won't sway back and forth while the disconnect is being turned on or off. What section are you seing that says you cant mount it to the duct work?
 
You remove sway when you use triangle supports. I hang ac disco above drop ceilings that have removable access panels frequently. I attach unistrut channel triangle supports to the ceiling and attach the disco to the verticle side of the triangle supports. Flex over to unit. Done.
 
Sparkfromtex said:
The closet is too tight to get a disconnect on the side of the unit or on the wall inside the closet, and all that is exposed on the front of the unit is removeable service panels. Above the ceiling is not redily accessible, and the AH unit does not have an internal breaker where can the disconnect be mounted to satisfy 440.14?
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This is poor planning.

Install a permanent, lockable means on the supply circuitbreaker.
 
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