LG HM031M - Page 58

6. Installation
Air-to-Water Heat Pump _ 12
Part 2. Desing and installation
6.5 Vacuum
To work of vacuum action. when the leak of refrigerant.
SVC Port
Manifold gauge
Gas Pipe
(At cooling mode)
Vacuum pump
(0.5 ~ 1HP)
Lo Hi
Manifold valve
Pressure
gauge
Open
Close
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