Check Points, Maintenance and Troubleshooting
64 Air-to-Water Heat Pump
When selecting a vacuum, you should select one which is capable of achieving 0.2 Torr of ultimate
vacuum.
Degree of vacuum is expressed in Torr, micron, mmHg, and Pascal (Pa). The units correlate as
follows:
Unit
Standard
atmospheric
pressure
Perfect vacuum
Gauge Pressure Pa 0 -1.033
Absolute Pressure Pa 1.033 0
Torr Torr 760 0
Micron Micron 760000 0
mmHg mmHg 0 760
Pa Pa 1013.33 0
2. Charge of refrigerant
You should be charged after vacuum.
You can see amount of refrigerant at quality label.
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