The Lennox HPXA19 is a discontinued split-system heat pump with efficiency ratings of up to 18.6 SEER and 9.3 HSPF. It featured a two-stage scroll compressor and was designed for both ground and rooftop installation. A system operation monitor detected common fault conditions in the system and communicated diagnostic codes through a series of LED lights. The unit was also equipped with a biflow filter drier, high and low pressure switches, and a defrost control. The HPXA19 used R410A refrigerant.
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