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Coleman Evcon electric furnace
QUESTION:I bought a home that has a Coleman Evcon model EB15B furnace. Until I
upgrade to a heat pump, I'd like to get the most of what I can out of
this fuel hog.
When the thermostat calls for heat, the fan blows and 2 of the three
heaters in it have power going to them. (the limit switch is OK to the
one that doesn't turn on.) (I'm guessing the third may be for if it's
very, very cold?) Anyway, when the room temperature rises, the
thermostat opens, the fan speed slows, and the two heating elements are
still getting full 240VAC. After about a minute it shuts off
completely. This seems strange to me, I again am guessing that the
heaters should turn off and the slow fan speed makes good of what heat
is in the system, mainly the two hot heating elements. But like I said,
the heaters stay on. Is this not working correctly?
All three heating elements are wired to what the wiring digram calls a
"sequencer", it looks like a combination of two relays/heat sensor
combinations, mounted on a plate with the numbers: 15SH41 309509
3115-357 H1-110 C1-110
So is the sequencer bad? Which of those numbers are the actual part
number I would need to get a replacement? Can I get a replacement? Where?
(by the way I've been playing with 240VAC for almost 30 years now and
I'm not going to fry myself)
ANSWER: The operative phrase here is "I've been playing with 240VAC for almost 30
years now". "Playing with" and "safely working with" are 2 different
animals. An electrician or handyman or plumber does not an HVAC technician
make.
You obviously don't know or understand the operation of the most basic of
electric furnaces. and no its not working correctly. Call your local,
*competent*, licensed, insured, professionally trained, HVAC technician to
diagnose the problem(yes I *do* know what it is), then have him correct it.
I get calls frequently where the trailer owner has screwed with the furnace
and instead of a simple repair, it turns out that the entire thing has to be
re-wired and all of the 24VAC control components have to be replaced after
having 240VAC run through them. Makes a hell of a mess and its very
expensive to correctly repair.
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