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10-25-2009, 07:21 AM
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#1
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Junior Member
Join Date: Sep 2009
Location: nj
Posts: 3
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built in disconnects
Do you guys find that most new - ac units , condensing units as well as heaters are coming with built in means of disconnects
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10-25-2009, 07:52 AM
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#2
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Ratus Maximumus
Join Date: Apr 2009
Location: South Eastern MA
Posts: 1,340
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Quote:
Originally Posted by lakeveiw
Do you guys find that most new - ac units , condensing units as well as heaters are coming with built in means of disconnects
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It depends on the job and how the units are ordered. The built in disconnects are an option when the units are ordered.
Many of the large chain stores we do will have job specs that require the HVAC contractor to order units with built in in disconnects and built in GFCI service outlets. Makes it sweet for us, we just bring a single 480 volt feeder to them and we are done. The GFCI receptacle is powered from the 480 via a transformer.
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Bob Badger
Electrical Construction and Maintenance
MA, RI, CT
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10-25-2009, 10:09 AM
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#3
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
Posts: 5,187
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Quote:
Originally Posted by Bob Badger
Many of the large chain stores we do will have job specs that require the HVAC contractor to order units with built in in disconnects and built in GFCI service outlets. Makes it sweet for us, we just bring a single 480 volt feeder to them and we are done. The GFCI receptacle is powered from the 480 via a transformer.
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I have seen that also. It sure makes it a lot easier on the electrician for sure, and like you said Bob it is becoming more and more common.
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10-25-2009, 10:29 AM
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#4
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Senior Member
Join Date: Feb 2009
Location: us
Posts: 515
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Not much around here. The option for the breaker on an average residential job adds over $100.00 Most HVAC contractors won't spring for that, just to save the electrician a $6.00 pullout. I agree,,,it's nice, but in the game of money, it doesn't add up.
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10-25-2009, 11:16 AM
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#5
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Senior Member
Join Date: Jun 2009
Location: U.S.
Posts: 133
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Did 2 rooftop units last week and they both came with built in disconnects. Nice and easy.
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10-25-2009, 09:19 PM
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#6
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Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,015
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Quote:
Originally Posted by lakeveiw
Do you guys find that most new - ac units , condensing units as well as heaters are coming with built in means of disconnects
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Commercial, yes.
Residential, no, at least as far as A/C and heat pump units. Air handlers/furnaces, sometimes.
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John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution. 
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10-25-2009, 09:43 PM
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#7
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Burger Flipper
Join Date: Aug 2007
Location: Bay Area, CA
Posts: 1,376
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Quote:
Originally Posted by Bob Badger
It depends on the job and how the units are ordered. The built in disconnects are an option when the units are ordered.
Many of the large chain stores we do will have job specs that require the HVAC contractor to order units with built in in disconnects and built in GFCI service outlets. Makes it sweet for us, we just bring a single 480 volt feeder to them and we are done. The GFCI receptacle is powered from the 480 via a transformer.
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You dont hook it up? Doesnt an HVAC company have to have an electrical lisence to hook it up in that case?
~Matt
__________________
I would rather beg for forgiveness then beg for permission.
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10-25-2009, 10:30 PM
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#8
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Rat in a Dress
Join Date: Aug 2009
Location: Port Coquitlam, British Columbia
Posts: 566
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ya the heat pumps we are installing in all the units in the tower Im on all have their own.
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I can drink you pretty.......
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10-26-2009, 01:02 AM
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#9
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Hack and Rat all in one
Join Date: Jan 2009
Location: Stars and Stripes
Posts: 3,276
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Quote:
Originally Posted by TOOL_5150
You dont hook it up?
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Yes, the EC's always hook them up. I think he just meant that it's not required to bring an additional 120 volt feed for the receptacles. One 480 volt feed and done.
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10-26-2009, 01:06 AM
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#10
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"A" inside wireman
Join Date: Sep 2007
Location: Ocean, NJ
Posts: 3,872
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It all comes down to the job specs, most of the commercial jobs we have done in the last few years have had them OEM.
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10-26-2009, 06:57 AM
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#11
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Ratus Maximumus
Join Date: Apr 2009
Location: South Eastern MA
Posts: 1,340
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Quote:
Originally Posted by Bob Badger
we just bring a single 480 volt feeder to them and we are done.
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Quote:
Originally Posted by TOOL_5150
You dont hook it up?
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Quote:
Originally Posted by Peter D
I think he just meant that it's not required to bring an additional 120 volt feed for the receptacles. One 480 volt feed and done.
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Thanks Pete, yes I meant we terminate the feeder as well. But we do not have to play around trying to find a good place to hang the disconnect, install the receptacle or supply it with another circuit.
Many times the supply and return duct smokes are also factory installed and all we have to do is monitor them with the FA system.
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Bob Badger
Electrical Construction and Maintenance
MA, RI, CT
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10-26-2009, 07:52 AM
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#12
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Burger Flipper
Join Date: Aug 2007
Location: Bay Area, CA
Posts: 1,376
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Quote:
Originally Posted by Bob Badger
Thanks Pete, yes I meant we terminate the feeder as well. But we do not have to play around trying to find a good place to hang the disconnect, install the receptacle or supply it with another circuit.
Many times the supply and return duct smokes are also factory installed and all we have to do is monitor them with the FA system.
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Gotcha! 
~Matt
__________________
I would rather beg for forgiveness then beg for permission.
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