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AC Unit Installed on Roof Top #104813 11/16/03 08:24 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
I don't think that this work was done by an electrician, and it looks like there may have been no permit secured or the benefit of an inspection here in Boston on North street!

What about the vent here? Anything to discuss concerning the proximity to the unit?

[Linked Image]

Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: AC Unit Installed on Roof Top #104814 11/16/03 08:28 PM
Joined: Nov 2003
Posts: 269
electricman2 Offline
Is that white box the disconnect?. Also,wonder why he left all that flex coiled up?

Re: AC Unit Installed on Roof Top #104815 11/16/03 08:50 PM
Joined: Oct 2003
Posts: 147
crash Offline
It is the disconnect, some of the weather-proof enclosures (for this purpose), that I have seen have tiny drain holes in the bottom and are constructed so water will not enter the top, but will drain out the bottom. Laying the enclosure on its side defeats this. Not to mention other code issues. But I don't think the disconnect and flex are the big danger here.

Re: AC Unit Installed on Roof Top #104816 11/17/03 04:17 AM
Joined: Jul 2003
Posts: 394
Big Jim Offline
The unit is a heat exchanger, there is no transfer of air into the building. I don't think the proximity of the vents is a problem except possibly the combustion vent could be hot and pose a hazard to the service person.

Re: AC Unit Installed on Roof Top #104817 11/17/03 05:16 AM
Joined: Aug 2002
Posts: 1,081
ThinkGood Offline
Could that be a sewer line vent? Stinky...

(Or is that vent part of the HVAC system?Still, it seems too close to the unit.)

[This message has been edited by ThinkGood (edited 11-17-2003).]

Re: AC Unit Installed on Roof Top #104818 11/17/03 09:22 AM
Joined: May 2002
Posts: 25
seeks Offline
There should be a receptacle within 25 feet for maintenence persons to plug in to.

Re: AC Unit Installed on Roof Top #104819 11/17/03 11:11 AM
Joined: Aug 2002
Posts: 1,081
ThinkGood Offline
Is the puddle from condensation or from rain? How deep can the water get? Should the unit be raised up on blocks?

Re: AC Unit Installed on Roof Top #104820 11/18/03 08:11 PM
Joined: Apr 2001
Posts: 518
John Steinke Offline
The vent loks like the sort used to vent a gas water heater, space heater, etc. As such, it may include an inner sleeve for "out" and an outer sleeve for "fresh air in."

That coiled flex and "Bell" box look to be some design to allow the equipment to be operated fron some distance away. Is there another unit nearby that might work together with this one, and for which a serviceman might want to control from one point?

Re: AC Unit Installed on Roof Top #104821 01/03/04 02:14 PM
Joined: Jan 2004
Posts: 2
Steve Wiggins Offline
Junior Member
The elect whips come extra long and coiled up like that. It saves an extra step by not cutting it to length. The disconnect box was probably mounted on the unit at one time but the service person had to remove it to gain access to the controls.

Vent pipe is not a problem.

Obviously the owner doesn't care because there was no permit pulled and the equipment looks like a cheap piece of scratch & dent. A lot of rental apartments are this way and worse. But see the employees of the property managers are exempt from regulation in most states [Linked Image]

Re: AC Unit Installed on Roof Top #104822 01/20/04 08:02 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
This unit looks like it was just thrown on the roof. It should sitting atop a structural member that will hold the additional weight.
The Liquidtite, as in any other conduit, can't have >360° of bend between pull points, much less remain coiled.
(We actually know a guy that lives on North Street in Boston [Linked Image] I can't imagine him letting this remain in his neighborhood!)...S

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