Midea MT-200R20E20

Outdoor unit
Gas pipe stop valve
Liquid pipe stop valve
Fig.4-11
Pressure gauge
Service port
Vacuum pump
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4.4 Vacuum Drying
4.4.1 Purpose
Vacuum drying should be performed in order to remove moisture and non-condensable gases from the system. Removing
moisturepreventsiceformationandoxidizationofcopperpipingorotherinternalcomponents.Thepresenceoficeparticlesin
thesystemwouldcauseabnormaloperation,whilstparticlesofoxidizedcoppercancausecompressordamage.Thepresence
ofnon-condensablegasesinthesystemwouldleadtopressureuctuationsandpoorheatexchangeperfor-mance.
4.4.2 Procedure
• Do not let air, dust, or other impurities fall in the pipe system during installation.
• Theconnectingpipeshouldnotbeinstalleduntiltheindoorandoutdoorunitshavebeenxedalready.
• Keep the connecting pipe dry, and do not let moisture in during installation.
• When connecting copper pipe, please wrap it with thermal insulation material.
NOTE