I have a dual fuel heat pump propane back up I want to run the propane
emergency heat with a generator. Can I just wire the 120 line that goes to
the indoor unit to my generator transfer switch and set my thermostat on
emergency heat ?
I have a dual fuel heat pump with Nat Gas. My furnace has a 110 plug.
I just unplug it from the outlet and plug it into an extension cord
hooked to the generator and set the thermostat to emergency heat. It
works just fine.
On my York system, I'm almost positive the thermostat didn't "power up"
until we turned on the HP breaker. But, I may be wrong. I'll have to check
into that. It's a good question, as I have a HP with NG backup.
"Gary" < email@example.com> wrote in message
Can I ask the group what brand dual fuel heat pump you have, and if your
happy with the performance.
Mine is a Lennox dual fuel, porpane. The system (and house) is two years
old. I've had several problems; the compressor was replaced last January
when it locked up for no apparent reason! The replacement was installed
with some kind of electric booster so it wouldn't stall (???). Recently,
I've noticed, several times, that the house fan and condensor fan will run
without the compressor running. The back up heat does not come on. I've had
to turn the fan off manually to get the system to cycle. Then, it seems to
run ok for awhile.
My last house and system (Carrier) was also dual fuel but with electric
back up and I never had a problem in the twelve years that I owned it.
Are heat pump systems with gas back up working well? Are some Brands better
than others when it comes to gas back up? Comments please!
That's another thing, my heat pump runs untill it can no longer statisfy
indoor temp; then, it switches to gas. Once the thermostat is satisfied,
the system shuts down and the cycle repeats;e.g. heat pump then gas if
indoor temperature can't be satisfied. It'll blow cold air for awhile
before it switches to gas and the iterim chill in the house is quite
apparent. Is that normal? I don't think my unit has an outdoor thermometer.
It depends, some heat pumps have a thermometer built in. Mine had
that, but I had to change the thermostat and it had the function built
into it. It did take two more wires and was a bit of a pain to
install. It allowed the outside thermometer to be placed where I
My unit works regardless of outside temperature. It just switches to gas
when indoor temp can't be satisfied.
My current concern was that on several recent occassions I noticed an
abnormal amount of cold air from the heat ducts. Upon checking the heat
pump, I discovered that the fan on the unit was still running yet the
compressor was not and the system seemed to be stuck in a loop wherein the
gas furnace didn't kick in and the fans (furnace and condensor) wouldn't
shut off unless I did it manually. Then, after a brief compressor lock out
period, the system seemed to recycle OK .
The heat pump/furnace is controlled by a computer unit (FM21 Controll) and
sometimes I think it has a glitch in it.
Computers are controlling everything and driving me nuts trying to figure
out where the problems are :-(
That is what my unit was doing when the reversing valve got stuck. It
started out just doing it some of the time, then it failed completely.
I had to run it on emergency heat until a new one could be ordered and
I was suspicious of the reversing valve when the first compressor locked
up. It would make an awfull noise when it tried to defrost. It took 10 days
to get a replacement compressor. Fortunately, the weather cooperated. Had a
warm spell so it wasn't too bad using the back up heat. I'm hoping I don't
go through another compressor. :-). Thanks for the info.
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