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Old 09-08-2021, 05:13 PM
nick325xit 5spd nick325xit 5spd is offline
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Quote:
Originally Posted by X5chemist View Post
A search has not found any pressure charts for a variable compressor. I can tell you on a 100 degree day, mine gets to knuckle chilling <40F. Even the two lowest setting are ice cold. I have turn vents away. I'll keep looking for a pressure chart.
A variable rate flow compressor should be able to maintain optimal low side pressure without cycling on and off. It shouldn't change the target pressure.

The issue with standard compressors is that they over-compress the refrigerant and will freeze the evaporator if they run continuously. (I briefly ran my E30 M3 with no evap temp sensor... Vent temps in the low 20s and occasionally even high teens were incredible. Until the evap froze over.) VRF compressors are amble to run continuously at optimum pressures.

Net-net, without seeing a chart, I would expect optimum low side, and for the high side to rise as normal, until the system reaches the capacity limit.
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