Hi all. I am planning to add a return wall vent in the living room. There is an existing return wall vent in the room and I looked at how that was installed. Looking up into the basement joist bay, I found a metal plate along a flat side of the oval stack head (#5 in the picture). The house was built in late 80's. Currently, the living room has hardwood flooring. It might have been carpeted at one point. My guess is this metal plate was put in place to support flooring because the hole in the subfloor was way oversized.
Could there be another reason why a metal plate was there?
I appreciate your comments.
Thank you
1) Rim joist around floor josts
2) subfloor 1st floor
3) Living room wall bottom plate
4) throat of oval stack head
Hi all. I am planning to add a return duct in the living room. One option is to connect the new vent to an existing return branch running not too far from the planned vent. The branch is an 8" round duct. The branch return duct and a branch supply duct are inside a box/soffit and I only have access to the top of the return branch. This section of the branch was installed with the seam on the top. Is it ok to cut a 6" hole on the seam? If so, do I need to take any precautions so the seam won't pop open?
Thank you
It's a Lennox EL180UHO70E36B-01 unit. This morning the house was cold so I started looking into it and here I am now.
As I am watching it, the error light gives a slow steady blink indicating it is functioning normally. The induction fan kicks on for a while, then a click and the sid(?) starts to glow, stays on for about 5 or 10seconds, then another click and everything stops. Then the error light starts it's slow steady blinking and the whole thing repeats continuously. It doesn't stop after 3 tries, it keeps trying with no error code. Each cycle takes about 30 seconds and the gas never kicks on. No solenoid sounds or gas flow sounds from the gas valve either.
Other observations from troubleshooting:
If I switch off the gas valve the fan does not stop and I will get the 3 blink code "burner failed to light or lost flame", but when I switch it back the above cycle continues and the code goes away.
Voltage across the gas valve is 0Vac until the final click (I understand this is normal), then it goes up to .6Vac momentarily and back to 0.If I disconnect the leads from the gas valve and check voltage, I will get 28Vac after the sid has been on for a bit and the fan will continue to run and I will get the 3 flash error code again.
I also removed and cleaned the flame sensor and ignitor because it's easy and quick and was hoping that would fix it, but it didn't.
The second click, just before the fan stops and the cycle starts over, is coming from the K1 relay on the control panel. I don't have the full wiring schematic, just what's posted on the back of the panel, but it looks like the K1 relay activates the gas valve.
My theory is when the K1 relay activates something causes an overload and the system shut down and restarts, I don't know what it could be or how to test it. It could be the gas valve, the control panel or even the main blower for the house. If I had a full wiring diagram (something that explained what the relay connects to) I could start narrowing things down, but I got nothing.
I'm an electrician, nothing with HVAC, valves scare me, especially gas valves. Money is tight, so if this is something I can fix myself I would be greatly appreciated. Please help, it's so cold out there.
01-07-22, 05:18 PM
