Heat Pump issue

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Old 11-11-19, 12:22 PM
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Heat Pump issue

Hello,

I have a closed loop water fed heat/ac pump in my unit.

We are responsible for repairs, so wanted to get an idea of what might be happening before I call anyone.

It seems lately that when the temp drops below the setting on the thermostat, the fan will kick in for several minutes before the compressor kicks in.

This means that colder air is blown out of the unit which in some cases causes the temp to drop even further before the hot air starts coming out.

Once temp is reached, everything turns off properly (i.e. fan doesn't keep running).

Is there some type of switch or something that might be bad?

Thanks
 
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Old 11-11-19, 06:48 PM
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the fan will kick in for several minutes before the compressor kicks in.
That is how most thermostats operate. The time delay is to keep the compressor from short cycling. Is this the original thermostat ?

Those are complicated systems and without at least knowing the make and model ....
it would be almost impossible to help you.
 
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Old 11-12-19, 04:51 PM
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Itís not the original thermostat and itís definitely not how it was always behaving. From what I can recall, the issue wasnít present when first changing the thermostat.

I might have one of the originals that I can use to test.

From what I can make out on the sticker:

Manufacturer: The Whalen Company
Model: VI-A-403-BY

Thermostat is the Sensi by Emerson.
 
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Old 11-12-19, 08:23 PM
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I can tell you for certain that the Sensi has a 3-5 minute compressor start up delay in A/C mode. I would assume that is the same delay in heating mode. I don't know for sure as I haven't seen one of those on a heat pump system.

CAUTION: Use with a thermostat other than those provided or approved by Whalen can void all warranties.
NOTE: The thermostat MUST include anti-short cycle protection to prevent rapid ON/OFF cycling of the compressor. A delay of at least 4 minutes is required. Setting this delay is the responsibility of the installing contractor.

Whalen VI manual (pdf)


Apparently you can turn the compressor protection delay off in the Sensi. I don't recommend doing that.The following from Sensi...... A/C protection support.
 
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Old 11-13-19, 07:10 AM
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That is very helpful. Thank you!
 
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