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HVAC T-Stat Wire Routing #120782 05/02/05 09:07 PM
Joined: Oct 2000
Posts: 3,632
Admin Offline OP
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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
Joined: Jul 2002
Posts: 8,359
Trumpy Offline
Member
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
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
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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
Joined: Jul 2002
Posts: 8,359
Trumpy Offline
Member
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
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
That fine bit of "carpentry" was done by the HVAC guy.

Re: HVAC T-Stat Wire Routing #120787 05/05/05 09:20 PM
Joined: Jul 2002
Posts: 8,359
Trumpy Offline
Member
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
Joined: Nov 2003
Posts: 16
T
tshea Offline
Member
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
Joined: Jun 2011
Posts: 1
H
HVACInfo Offline
New Member
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
Joined: Feb 2002
Posts: 2,233
H
harold endean Offline
Member
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
Joined: Apr 2002
Posts: 7,218
HotLine1 Offline
Member
Harold:

Are you tastefully implying something ???

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



John
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