Recent posts

HVAC Help / Re: Amyone do Hvac drawing for...
Last post by wantboost - Today at 06:17:31 AM
Quote from: tenletters on September 28, 2022, 04:44:12 AMI took the residential air design course. If you don't know about sheet metal design, it's pointless and all you get is the ability to slap your number on a print the installers will just laugh at.

The software won't taper down the duct properly the longer the run is. It'll use a 6'' round for 2 cfm of air you should have just removed.

The software makes the drawing for you, but you have to know what stuff to change.

Also they don't teach software. You do it by paper in that hrai class.
On paper did they reach you the sizing tho?
Can autocad be used with mep?

Did they teach you the following:

Heat loss /gain ,& window distribution
Heat loss / gain summary sheet
Residential foundation thermal load
Envelope air leakage calculator
Residential mechanical ventilation design
Technical Information / Underground piping CSST
Last post by samihabib - October 05, 2022, 08:54:44 PM
So I know common practice is to run CSST underground through PVC conduit, can you use ABS instead ? Or even 636 ?
HVAC Help / Re: PTACs and Wired Thermostat...
Last post by Sergroum - October 04, 2022, 03:34:49 PM
one thing you need to make sure is the number of wires you've got ran between your ptac and the thermostat

If you only have 2 wires, you are pretty much limited to wifi tstats.

I'd say the moment you have 5 or 6 wires then the number of options become wildly variable.

Any tech should be able to do it.  Friedrich is not using any weird communicating board to tstat systems, so any tstat mentioned above would work. Provided you have the wires for it.
HVAC Help / Re: PTACs and Wired Thermostat...
Last post by Admin - October 04, 2022, 03:15:54 PM
Some manufacturers make you buy a wiring adapter to use a remote stat.  Some use their own proprietary stat.  It really depends.

The Friedrich manual I looked up lets you use any stat with single stage cooling, 2 stage heating and a B reversing valve terminal, which energizes on cooling.  And depending on whether you want low speed or high speed fan you connect GL or GH to the G on the stat.  I would check before buying though.  Newer models may change.

Any HVAC installer should be able to do this.

The advantage with WIFI stats is you can get alerts if the room is freezing.
HVAC Help / PTACs and Wired Thermostats
Last post by spedprof - October 04, 2022, 02:34:02 PM
Living in a condo apt. by the ocean in New York State where all units have PTACs. Prefer Friedrich units. All rooms have wired programmable thermostats but of different brands. The latest Thermostat, made by Friedrich, is a pain to to use. As some PTACs are aging, I'm trying to look ahead to the replacement of a unit or two. A few  questions:
1) If wired programmable thermostats are working, any reason to change to Bluetooth models? (Not interested in W-Fi thermostats).
2) Can I use any brand wired Thermostat with a new Friedrich PTAC or is it advisable to use a Friedrich Thermostat?
3) Should any HVAC installer be able to hook up the wired PTAC to the thermostats? (Have had problems in the past) .
Technical Information / Re: Which meter serves who? I ...
Last post by Admin - October 04, 2022, 05:20:53 AM
Nothing in writing.  I deal with them in residential new construction where they enforce these stamped tags.  We only stamp the numbers from the address and that is accepted.
Technical Information / Re: Which meter serves who? I ...
Last post by Attavior - October 03, 2022, 09:51:31 PM
Hey Admin,

Do you have anything written from Enbridge or is it what their inspectors will accept?   
HVAC Help / Re: Mid efficiency inducer fan...
Last post by Admin - October 03, 2022, 09:51:16 AM
It sounds like a faulty control board that is not sending power to the inducer motor.  You can wire the inducer motor to constant power to prove it works.  It's usually pretty easy to connect the black inducer motor wire to the black line voltage wire coming into the furnace.
HVAC Help / Mid efficiency inducer fan wil...
Last post by jinxie - October 03, 2022, 09:45:45 AM
Good Morning

My mid efficient residential furnace will not fire up. Would someone be able to help me troubleshoot? I am mechanically inclined so I should be able to follow the necessary steps.
Here is what I know so far....
The furnace A/C works fine
When I switch the thermostat to heat or cycle the switcIMG_9869.jpg h on the furnace you can hear and measure 24V power coming out of the transformer. You can also hear the relay on the circuit board "click" as power is turned on. (I assume that is what should turn on the inducer fan?)
No power at the inducer fan
I realize this is pretty vague, but it doesnt seem like there are alot of components in between to troubleshoot? For example there appears to be a pressure switch and the gas valve switch/wiring that probably controls the inducer somehow?

HVAC Help / Re: Honeywell T9 install for M...
Last post by cmtullos - October 02, 2022, 08:13:49 PM
It came with the adapter.  I'm unsure how to wire it in since the circuit board only has the 4 ports listed. I did not see a "Y" on the diagram. Is it possible to use the blue wire for Y, and C?  On the old thermostat it was connected to Y, and to C on the control unit within the furnace housing. Is it possible to splice the adapter "C" wire to a different 24v source on the circuit board, and place the other wires accordingly?