GREE U-Match 5 SERIES UNIT SERVICE MANUAL
78
Following is the supplementary requirement for refrigerant charging on the basis of normal procedure:
1
）
Make sure that when charging refrigerant into the system, no other types of refrigerant will be mixed. The
pipeline for refrigerant charging should be as short as possible to reduce the amount of refrigerant left in it.
2
）
The refrigerant tank should stand erect.
3
）
Make sure the refrigerating system is already grounded before refrigerant charging.
4
）
When charging is completed (or not yet completed), stick a label on the system.
5
）
Before re-charging refrigerant into the system, use oxygen-free nitrogen to perform pressure test. When
charging is completed, perform leak test before trial running. Before leaving the workplace, perform a leak test
again.
4.4 Maintenance of Major Components
4.5 Removal of Major Components
4.5.1 Removal of ODU Major Components
Picture
Name
Function
Compressor
Through compression, the low pressure refrigerant occupies a less space.
As its pressure and temperature both rise, it becomes high pressure and
high temperature refrigerant. It is the power drive of the system.
4-way valve
It is used to change directions, the flow of refrigerant in cooling/heating.
Motor
The power drive of the fan. It enables the fan to run so as to provide
smooth currents of air for forced convection and heat exchange of
condenser and evaporator.
Fan
It is used to provide smooth currents of air for forced convection and heat
exchange of condenser and evaporator.
