HVAC Questions? Ask an HVAC Expert for Answers ASAP
ill see if i cant assist you here.
two possibilities here
one and most common, is the roof cap for the exhaust vent is gone and wind is causing ill effect on the pilot sensor.
the second is the polarity of the wiring from the breaker panel is wrong. Sometimes you can switch the power leads comming in to that furnace and solve the problem
most techs dont bother to check polarity and this becomes evident as the unit gets older
hi there! The exhaust actually is actually exhausting out horizontally, but come to think of it, it didn't have any cap or anything to prevent wind
wind could be pushing the flu back into
ok, there is your problem exactly
you need to buy a proper side discharge cap for it
I don't want to use that as an excuse though, but I'll see if I can put something over it and see if it solves the problem
if that vent is open, it requires a cap by code here in the states
and yes that will definately cause your issue
it has a guard over it
but no cap
you mean like a mesh?
I don't do any residential really, but I imagine the rules are the same here in Canada, I'll have to read up on that
is this pvc pipe?
i would suggest you add a 90 downturned elbow
and then cover that with the mesh
yeah the problem seems intermittend
almost like whenever it went below freezing it would drop out
but I would just find it very odd that the unit would run for a good period of time, and then fail on ignition
not uncommon at all
well that's great to hear
I figured it was something to do with the venting
the unit appears ok
and I don't think it's the supply voltage
stick a 90 on that pipe and i bet your problem goes away
I'll give it a shot.
and its not a matter of voltage really, its the polarity of that voltage
Thanks so much for your time
even single phase?
one side is hot which should connect to the black wire, and the other side is neutral and should be on the white wire
single phase is the only place you have this issue really
yeah that's how it's wired
in 3 phase it just affects direction of flow
ok well I'm pretty sure it's the venting
but if not, I'll try the polarity
im inclined to believe the same thing. vent
may even have a critter that is dead inside the pipe
thats another issue i see on those systems
and they would get into the pvc even with a mesh cover?
but with the mesh thats kinda unlikely
I don't deal with residential, only commercial and industrial
I appreciate your input
i normally do ems systems and Lieberts
amd good luck