Frequently Asked Questions...
how do i charge a heat pump when it is cold out (30 degrees)?
i am trying to charge a heat pump but due to the cold temps (30 degrees today) i can not get refrigerant into the system. I assume i will have to heat the tank (using the right tool) but im looking for advice as to gauge readings, etc, etc. I am comfortable with the cooling mode and know how to troubleshoot and charge using superheat, subcooling, etc. I am not really experienced with heat pumps. I understand the theory and how it works with reversing valve, etc. I just have never set one up and have had to change the compressor on my own personal unit so I am trying to learn the basics. If someone can walk me through the set-up i would greatly apprciate it. Thank You.
Answer:
Wait until a day when its not quite so cool out, maybe about at least 45 degrees, and run it in cooling mode, blocking the condenser fan outlet to simulate a 90 degree day so you can get the pressures up and obtain accurate superheat and subcooling readings (be careful not to raise the pressure too high). You cannot accurately charge the unit running in heating.
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Superheat Subcooling
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