Corrosion inside furnace around opening to heat exchanger
Looking for some advice please... We have a couple relatively new high efficiency Daikin furnaces (2.5 years old). We are noticing an unusual amount of corrosion in one of the furnaces, specifically on the inlet plate facing the middle burner (picture attached) around the hole leading into the heat exchanger. There is no visible corrosion elsewhere on either furnace. We had a couple contractors come in and they weren't able to determine the issue. Wondering if anyone can shed some light on what could be going on. Any thoughts would be sincerely appreciated, thank you.
Last edited by PJmax; 07-05-21 at 09:42 PM.
Reason: resized pic
Thank you so much for responding. Below are a few pictures of the venting. There are two furnaces, the one with corrosion inside is on the right. It is the larger of the two furnaces (60k BTU). Any insight is appreciated!
Furnace on the right shows corrosion (facing middle burner). Intake is non direct, however, there is a fresh air intake from the duct on the left. Exhaust wraps behind the furnaces.
Furnace exhaust routes behind the furnace, then goes up into the basement ceiling and then travels approx 15 feet before venting outside.
The furnace is natural gas. Flames look ok to my untrained eye. Something that i thought of is that the furnaces share a relatively confined space with a water softener and extra bags of salt. When we were cleaning, we noticed salt on the ground, and salt dust may have been produced whenever the softener was refilled. Perhaps salt in air may be contributing to corrosion during combustion? We've since cleaned up the salt but will continue to monitor. Seems like a reasonable theory given that the other furnace with no corrosion is closer to the fresh air supply...
I noticed a loud noise coming from my furnace. I went to take a look and discovered my draft inducer was running while the cool mode is on, the ignitor nor gas kick on, thank goodness. I have checked the wiring. In the last several months I had to replace the board due to water damage. The draft inducer should not run when in cool mode. I shut down the breaker for about 20 minutes, hoping a reset would happen. Any other possibilities?
[b]BLW00889 draft inducer Fasco D341663PO5
Trane XR80[/b]
Hi all; It's been awhile. I had two incidents with low voltage wiring lately. The first was on my relay control panel . I was looking in my LV panel box because I am redoing a bathroom, and I drained the HW system and I pulled the relay for that zone. While I was in there, I guess i touched some of the many LV wires in there. As i touched the wires I heard clicking. After a couple more touches, and clicking , I guested that some of the terminals might need tightening , and that took away the clicking. The almost same thing happened to my irrigation controller. I started it up this morning, and it stopped right in my face. So after 20 minuets of checking every scenario , I touched some of the low voltage zone panel wiring , It started up, again I tightened up all of the LV terminals on the circuit board. So I guess the message is check the LV circuit terminals once in a while, I guess every 5 or 10 years, some of those terminals might have 2,3,or more wires in them, and I guess they might work loose over time. Stay Safe.
Sid
06-28-21, 11:05 AM
