raharra
04-19-2008, 10:29 PM
I had a residential Coleman furnace that had a sticky combustion blower diff. press. switch. The part came in and I got it replaced/retested today, sat.:cool:
My questions are:
-the two ports were labeled "+P" and "V", which I assume meant positive pressure and vacuum. Yet, the (factory installed)tubes were connected to the combustion pipe exhaust fan on the suction and discharge sides respectively. Am I interpreting the labels correctly?
-On the "+P" side of the new switch, the port had a small tubing piece inside with a hole bored thru it, I guess that you would call it a sleeve inside the port. Only on the "+P" side (I searched the box for any missing sleeve for the other port, no dice), not the "V" port. What the heck is the purpose of that sleeve?
Plus, I have to say that I was pretty impressed with the flashing diagnostic light on this furnace. I had figured the intermittant problem was due to a dirty flame sensor until the board gave me the code for a failed combustion switch. Then, the homeowner informed me that the guy who used to work on his furnace (before he died) told him he had a sticky switch. He would tap the combustion d/p switch and it would work just fine for a while.
I was happy to have that diagnostic board telling me the same thing the homeowner was; it made selling him a new d/p switch a cinch.
I wish all of them were that easy.
My questions are:
-the two ports were labeled "+P" and "V", which I assume meant positive pressure and vacuum. Yet, the (factory installed)tubes were connected to the combustion pipe exhaust fan on the suction and discharge sides respectively. Am I interpreting the labels correctly?
-On the "+P" side of the new switch, the port had a small tubing piece inside with a hole bored thru it, I guess that you would call it a sleeve inside the port. Only on the "+P" side (I searched the box for any missing sleeve for the other port, no dice), not the "V" port. What the heck is the purpose of that sleeve?
Plus, I have to say that I was pretty impressed with the flashing diagnostic light on this furnace. I had figured the intermittant problem was due to a dirty flame sensor until the board gave me the code for a failed combustion switch. Then, the homeowner informed me that the guy who used to work on his furnace (before he died) told him he had a sticky switch. He would tap the combustion d/p switch and it would work just fine for a while.
I was happy to have that diagnostic board telling me the same thing the homeowner was; it made selling him a new d/p switch a cinch.
I wish all of them were that easy.