If a contractor is charging a heat pump in 40 degree weather is it true that he cannot get a sufficient charge on it to meet my summer high temp conditions? I know this was the case in the old compressors but wasn't sure if this was still the case. If I have a contractor install a heat pump in this weather do I need to have him come back and check the refrigerant charge when the temperature warms up?
Really, it depends on the unit, some units allow charging at lower temps. You really need to consult the unit charging procedures (which only apply to a properly installed system).
Yes you can weigh in a charge in cool weather, but you should always have it checked during a hot day for proper charge. The weight a manufacturor specs is for up to "15-25ft" lineset, so charge can be off a little with the weigh in method. Always best to use subcool/superheat per manu's specs in cool mode IMO.
If everything was always done "by the book"....the book would never change.
Originally posted by RoBoTeq Heat pumps can also be adequetly charged in cold weather using the hot gas discharge method. It is a bit of a pain, but quite accurate.
Never even heard of such a method. Please enlighten me sir.
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