Pressure Switch Not Closing Due to Drainage Problem On 90% Furnace EP108
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- Опубликовано: 26 ноя 2022
- How to diagnose a non closing pressure switch on a 90% furnace.
No heat call. The pressure switch was not closing and the inducer draft motor was struggling. While the unit was attempting to light I could heat water inside the system. I tried cleaned the condensate line and removed the flue pipe to see if there was any excess water. Water began pouring out of the flue. In this video I diagnose the problem and re-run the flue pipe to get proper pitch to promote proper drainage. Enjoy!
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Awesome video! Thanks for sharing!
Nice job. Learning a lot
Very informative video!
👍 good catch you Musta seen that 100 times
A classic case Billy Bob Butt Crack who can’t read an installation manual that even contains pictures with the big circle with a slash through the middle of it saying how not to install it.
Lowest bid won the install.
Very informative
Attention to detail nice video brother
Nice job 👌
Great info, my son has a new furnace and the guy ran the pipe across the basement ceiling to the outside, straight out to a 45 degree pointing down. I hear a gurgling sound and there is way too much dripping on the concrete. Now need to get it fixed...
Gurgling bad. Get the installation manual out, follow the manufacturers directions, you will solve the problem.
Nice work
Very informative. Keep the diagnostic videos coming bro! Cheers
Dam what a great video bro
Does no hell a long run for the venting. Great job!
All condensing furnaces have a detailed description of the length of pipe, size and how many elbows can be used or how much the pipe length is reduced based on the number of elbows/45s. Can't tell you how many times I've seen incorrectly, newly installed furnaces with the installation manual sealed tightly in the plastic package and never glanced at. BTW, Lennox furnaces come with a trap that can be mounted on the side of the furnace or remotely, up to 5' away, but they also have a vent that requires 3/4" pvc added to it that must be at least 1" above the cold end header box drain but not more than 2" above the drain for upflow. If it's a horizontal install the vent pipe must be at least 4" above the bottom of the furnace but not more than 5". There's obviously a great deal of specifics involved and it's not because the engineers just wanted to be jerks. It's either done correctly or not, no winging it.
Easy fix on my Lennox. the metered orifice plugged off and the pressure switch was shutting off the furnace. I drilled and tapped a hole in the trap and installed a plastic tubing drain with a loop that acts like a siphon on a steam boiler gauge so that no flue gas gets in the house. Retired steam engineer fix.
@@rooky55what is the metered orfice.?
That was a small orifice on the condensate drain piping that plugged off so the flue gas condensate was blocked from the drain pipe. Simple fix by installing a siphon and eliminating the orifice..Metered orifice is a term that is used on carburetors or other devices where a designed flow rate is required. @@farashvac
The installers should pay the bill. There is no excuse for mixing up the pressure switches. The installers can deny the pressure switch error. However the pipe i stall cant be denied
Great video. I have water in my furnace. I can hear it when it starts up. I need to vacuum out. Can i damage pressure switches when vacuuming?
Good catch. I was working on a 98% and the flame would drop out, I had checked everything could not understand why. So I start pulling off all the hoses from the collector box then tweaked my back, so I kind of fell back into the wall and just sat their. Then the owner a lady says ( Do you even know what your doing ) your the third guy out. I sat and stayed quite. I looked at the bottom left side drain nipple from the collector box and saw white stuff in it. ( Usually on 80% inducer motor's you see this all the time ). I went NO WAY! stuck my small screw driver in their it all broke apart . Put all the hoses back on and BAM! zero problem's. I have only seen this once on a condensing furnace.
Nice!
Hey Nighthawk, find a manual that shows the venting the way you did it is approved by the mfr.
Doing it this way increases the pressure on the venting system and by EVERY Carrier manual, is NOT correct.
Intake done this way is correct because it minimizes the possibility of sucking in the exhaust.
Exhaust is to be straight out/up or one 90°, like it was when you found it.
Hopefully this was not your company that did the install.
It is as if the installers never opened the installation instruction or if the bage is open, they cannot read.
It looks like the end of inducer motor is really close to the exhaust pipe .
Great video! Question: What happens if I connect the 2 pressure switch hoses backwards? Thanks.
The switch won’t close.
is there a drain outlet at the bottom/lower portion of the inducer housing/collector box? seems like the housing and collector box should drain even if that horizontal vent pipe was holding water..
I'm wondering as well. I see the drain pipe but how does water that was filling the vent pipe end up at the drain? Doesn't seem like water goes back to the inducer housing and end up at the collector box then to drain. Great video for sure.
The first red flag was that mitered 90 off the furnace. Such a horrible way to start and it only got worse. Should be long sweeps for vent applications.
Did you say Lenox does not have it's own condensate trap? Why is that and how can it function w/o one?
Some models of Lennox don’t have one built in but still require one added to the drain line. Came across many without one installed due to the installation manual not being read.
Does code allow for a drain to be installed in the flue in your area? I have seen them in my area installed for the same issue...
I think it depends on the manufacturer. Some carrier units required one near the unit and even comes with a proprietary condensate trap.
I replaced my pressure switch with a new one but it’s still throwing the same 3 red light code saying it’s stuck open. Any ideas?
What type of furnace do you have? 80% or 90 plus.
I had water in the little pressure switch hose, causing same error code.
I agree that the installers should have come back to correct the job. But so many times, if they didn't know what they were doing the first time, they won't know how to fix it unless you stand there and supervise. And that usually pisses off "Billy Bob Butt Crack" (LOL-comment below), so they just refuse to have you tell them what to do.
Agreed.
I’m worried about the main beam. It has a substantial amount taken out and it looks like it holds up the 2nd floor.
Robert
Carbon monoxide isn’t dangerous Right?
Horrible. The installers I mean. 😉👍
My thoughts exactly.
There are SOOOOOOOOOOOOOOOOOOOOO many things wrong with that install and it is ALL in the manual.
As the homeowner, I would demand t be done to the manual and be compensated for the downtime and any loss of work I take off to be there to fix that sh!t show of an install.
SANI-T
Ive been out of the loop have they recieved their license yet?