Posted by rrc300 u on December 21, 2015 at 16:44:48 from (107.77.76.17):
In Reply to: Lennox pulse furnace posted by Greg K on December 21, 2015 at 16:16:59:
I worked for a Lennox dealer while I was in HVAC school. This was in 1997. What I remember of them things is they had a spark plug and a rubber flapper valve on the qas heat side. From what you describe the heat pump should be working at this outdoor temp. Lennox did have some proprietary electronics on alot of their stuff. I would not be surprised if the heat pump propane change over was one of those proprietary parts. You might look at the basic stuff blocked drain or pressure switch tubes being plugged or blocked. Does the vent motor run or does the spark try to light off. If I remember correctly they pop a few times to get the firing set up and burning. I wish I could be of more help.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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