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HVAC T-Stat Wire Routing #120782
05/02/05 09:07 PM
05/02/05 09:07 PM
Admin  Offline
OP
Administrator
Member
Joined: Oct 2000
Posts: 3,481
NY, USA
Quote
I often see air conditioner installs that appear to have no t-stat line going to the remote condensing unit. This can be for three reasons:
- it is run within the power conduit (a violation);
- the unit operated on the principle of 'pressure drop,' and needs none; or,
- as shown here, the HVAC guy ran the wires with his 'line set.'

These pics show the need to know a little about other trades, as well as your own.

- renosteinke
[Linked Image]

[Linked Image]

Tools for Electricians:
Re: HVAC T-Stat Wire Routing #120783
05/04/05 07:16 PM
05/04/05 07:16 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
John,
I used to work for a company here that specialised in installing AirCon/HVAC equipment and the majority of our systems worked off of a Pressure switch.
Running a thermostat wire inside the same conduit as the Mains wiring sounds a little dangerous, considering that the T/Stat wire is often very lightly insulated, to say the least.
Speaking of insulation, were these pictures taken before the HVAC guy had a chance to insulate his pipe-work?.
Often the liquid (smaller) line would go un-insulated here.
I was hooking up the power to a new house recently where the Building Inspector refused to sign-off the Building Completion Notice until there was insulation on the Gas (larger) pipe of the AC system.
Un-insulated pipes like this cause water problems from dripping Condensation. [Linked Image]

Re: HVAC T-Stat Wire Routing #120784
05/04/05 08:30 PM
05/04/05 08:30 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
One must start the day early to slip one past Trumpy!

Yes, I took the pic before the insulation was added, so you could see the wire.

NEC does ban running "power limited" circuits in the same raceway as power cables- so running the t-stat wire together with the power leads is a violation. The whole point of my pic is to show your average non-HVAC person that the t-stat wires are often run separate from the power, even though they may not be visible without taking things apart.

Likewise, most electricians are not aware that some systems don't even have a cable run to the condenser (outside unit).

Re: HVAC T-Stat Wire Routing #120785
05/05/05 04:10 AM
05/05/05 04:10 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
BTW John,
Who was that idiot that nailed that dwang (Horizontal timber piece) in to hold the T-stat wire, in the top pic?.
Looks like the nail-gun completely missed as did the person fitting the dwang. [Linked Image]

Re: HVAC T-Stat Wire Routing #120786
05/05/05 07:44 PM
05/05/05 07:44 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
That fine bit of "carpentry" was done by the HVAC guy.

Re: HVAC T-Stat Wire Routing #120787
05/05/05 09:20 PM
05/05/05 09:20 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
The sheet-rockers are going to love that little piece of artistry. [Linked Image]

Re: HVAC T-Stat Wire Routing #120788
05/06/05 12:04 PM
05/06/05 12:04 PM
T
tshea  Offline
Member
Joined: Nov 2003
Posts: 16
racine, wi
Looks like the stud split, on the right, where Mr. HVAC added his 2x4.
Just proves anybody can be an electrician if they get hte right matchbook cover!

Re: HVAC T-Stat Wire Routing [Re: Admin] #201499
06/05/11 04:41 AM
06/05/11 04:41 AM
H
HVACInfo  Offline
New Member
Joined: Jun 2011
Posts: 1
Washington, DC
Many HVAC Technicians are certified to do some electrical work, it is really part of the trade. If your uncomfortable with the work that was done you can get a second opinion from another HVAC Contractor. You can find some in your area by going to http://www.airconditionerfeatures.com/location/contractorsdir/NY.html

Re: HVAC T-Stat Wire Routing [Re: Admin] #201517
06/06/11 09:12 AM
06/06/11 09:12 AM
H
harold endean  Offline
Member
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
Here in NJ a lot of HVAC people have EC's working for them. A lic. EC will sign all the permits and hopefully do the electric work.

Re: HVAC T-Stat Wire Routing [Re: Admin] #201519
06/06/11 10:00 AM
06/06/11 10:00 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,918
Brick, NJ USA
Harold:

Are you tastefully implying something ???

"A lic. EC will sign all the permits and hopefully do the electric"



John
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