Hi. I have a 1 year old York model B1HP036A06A heat pump that is not
quite keeping up with the cold (for California) temps in the early
morning hours. It is supplying a rebuilt 100 year old house of approx
1200 sq. ft.
What happens is it starts blowing cold air. When I turn it off for a few
minutes, it comes back to life and works fine for a while, then it will
do the same thing. This morning I looked at the outdoor unit and found
a layer of frost coated the entire fin surfaces.
It got down to about 24 deg F last night.
I had a tech look at it last week and he fiddled with the thermostat,
saying that it had been set to "fast" and reset it to "slow"; I'm not
sure what that was, as I see no such settings on the setback
thermostat. He serviced the unit and it seemed a bit better, until the
cold (for us) hit again.
Any ideas? Is this normal behavior for the unit?
[original post is likely clipped to save bandwidth]
It is well known that the heat pump function of air exchange heat pumps
doesn't function well by itself as outside temperatures approach freezing.
Thus, some provisions need to be made to handle such outside temperatures.
Have your tech explain how your system is designed to cope with near or
below freezing temperatures and avoid frost build up that will block air
flow and any possible heat "pumping". Some just have a simplistic back up
electric heater, let the tech explain yours.
If a tech can't explain how your system is designed to accommodate low
outside temperatures and convince you he tested those functions, get a
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gerry misspelled in my email address to confuse robots
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Notwithstanding, outdoors unit on heat pumps will freeze up under certain
weather conditions, thus blocking airflow .....
So most units will have controls hardware installed that forces them into
into a reverse cycle mode in order that mass airflow capacity through the
outside coils can be regained--the outdoor fan will stop, yet the compressor
and indoors unit still runs....most notably, very cold air will be
typoically be felt coming from the inside supply registers if there is no
active backup heat during defrost.
Now suggest post in alt.home repair if you have any more questions about
this, usually plenty of folks there who will wish to explain this all in
every minute detail.
Thanks, Fish--I take my compliments where I can, and I do realize that one
Also I am aware of the faq--just that seems answering the same questions in
alt.hvac over and over appears to have become something many, if not most of
the regular contributers there have grown tired of.
And so (notably), I have decided in the future to at least occasionally
change the followup header to the home repair group and suggest they post
there, if/when I myself have also grown tired, and whereupon few of the
alt.hvac regulars are seemingly displaying much interest in continuing with
addressing the OP 's original concerns.
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