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Doug Eby
Doug Eby, HVAC Technician
Category: HVAC
Satisfied Customers: 12
Experience:  15 Years Navy, commercial, restaurant
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Need help charging heat pump in winter and adding freon to it

Customer Question

What is the best way to check freon in a heat pump in winter below 20 degrees? And how to you add to it? I am a A/C tech and have never learned how to charge heat pump in winter correctly. Have calls with frozen heat pumps.

Submitted: 9 years ago.
Category: HVAC
Expert:  macleaner replied 9 years ago.


What brand of unit is this?

What is the temperature you are charging this in below 20?

What type of freon?

Customer: replied 8 years ago.

Any of them. I cannot get freon to go in even in bottle of hot water.

Expert:  Doug Eby replied 8 years ago.


I've worked on Trane heat pumps using R22,134 and 404. You don't want to run in heat mode if outside temp is too cold. Some units have a temperature switch that prevents the unit from running in cold weather. Try running in a/c mode & charge that way. If there is a sight flow indicator, check that for bubbles. If not, then go by condensate depression. Check with the manufacturer for the proper sub-cooling amount.

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