Some of those units do pretty amazing things in the cold these days. 10-15
years ago 20F was the practical minimum but I've read of units that will still
work down to 0F and there are some that probably go colder. I suspect
efficiency takes a dump at those temps though.
The guy I'm training to run the groomer is an HVAC installer and the other
night he was telling me that just about nobody is installing ground source heat
pumps any more due to the huge cost and the availability of low temp air source
units combined with the low cost of natural gas.
I'd considered ground source but the ones I've looked at are $20,000+ while a
new boiler for our house is more like $6,000 and would decrease our oil use
20-25%. It would take a long long time to pay off that extra cost. There are
incentives but they're decreasing every year.
-Curt
On Tuesday, February 16, 2021, 10:46:10 AM EST, Kaleb Striplin via Mercedes
<[email protected]> wrote:
I don’t know if size matters but it’s a 5 ton unit and even when it was in the
single digest I could tell it was putting out heat. I could tell the difference
between when the outside unit was running and when it was shut down and only
using the aux heat.
Sent from my iPhone
> On Feb 16, 2021, at 9:44 AM, Floyd Thursby via Mercedes
> <[email protected]> wrote:
>
> There's no point in it running if it can't extract any heat from the air.
> It's a wonder it was running and putting out much when it got down below 20F
> or so.
>
> --FT
>
>> On 2/16/21 10:36 AM, Kaleb Striplin via Mercedes wrote:
>> Power just came back on a few minutes ago. Outside unit still not running.
>> I did find the installation manual online though. Here is some info about
>> the defrost and lockouts. Sounds like it may simply be locking out because
>> the temp is too low.
>>
>> Heating Mode:The compressor and fan motor will stop when the low pressure
>> control opens and will start again when the low side pressure rises to
>> approximately 40 psig when the low pressure automatically resets�If the low
>> pressure switch trips 3 times within 120 minutes of operation during a
>> particular call for heating operation, the defrost control will lock out
>> compressor and outdoor fan operation�If the lock out due to low pressure
>> occurs at an outdoor ambient temperature below 5°F, the defrost control will
>> automatically exit the lockout mode when the outdoor ambient temperature
>> rises 5°F�This feature is necessary since the low pressure control could
>> possibly have opened due to the outdoor ambient being very low rather than
>> an actual system fault�
>>
>>
>> Of course with the power being out I figure that would have caused the
>> lockout to reset at least for a while. Will see what happens when it gets
>> over 5 this afternoon.
>
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