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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.
What brand of unit is this?
What is the temperature you are charging this in below 20?
What type of freon?
Any of them. I cannot get freon to go in even in bottle of hot water.
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.