GMV5 Home DC Inverter Multi VRF Units
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4）The refrigerant pipe must be laid away from the manhole of the unit so that sufficient space
can be reserved for maintenance.
5）The riser should be installed in the air conditioning tube well, and the horizontal pipe should
be placed in the ceiling, if possible.
9.2 Schematic Diagram of Refrigerant Piping
9.2.1 Piping instruction
1）Piping instruction for top discharge ODU
Note:
① Functions of oil check valve: During after-sale maintenance, the oil check valve can be
used to extract lubricating oil samples, which are further detected to analyze the oil quality in the
system. The oil check valve can also serve as the inlet for lubricating oil charging. Stop the system
for at least 12 hours and wait until the system internal pressure is lower than 0.2MPa before the
extracting of lubricating oil from the system; otherwise, overheat oil and overhigh pressure may
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