So, we’re trying to extract heat from the outside and bring it inside, which can be done down to a certain outdoor temperature. In heating mode, a reversing valve reverses the flow of refrigerant to make the indoor coil the hot coil and the outdoor coil the cold coil. We remove the heat from inside the house at the outdoor unit and pull it out to the outdoor coil to be released into the atmosphere. The refrigerant cycles through the system and basically makes the indoor evaporator coil, a cold coil, and the outdoor unit’s coil the hot coil. In cooling mode, the heat pump works just like an air conditioner. So let’s quickly review some things we learned in the last video. This one’s going to focus on the defrost function and what we should be checking to diagnose a heat pump that’s not working or might be frozen over in heating mode on a cold day. I have a video called Basic Heat Pump Operation that you might want to refer to if you need an even more stripped-down version of heat pump operation. So let’s go over some basics, that even I have to review from time to time because heat pumps are not my strongest suit. We know it runs like a normal air conditioner in the cooling season, but when we get into heating season, some extra components come into play and we get confused or lose track of the sequence of operation for a heat pump. There’s something mystical when it comes to the heat pump system.
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