GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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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 before the extracting of lubricating oil from the system; otherwise, overheat oil may burn the
operator.
(2) Functions of low-pressure check valve: It is mainly used for low pressure detection of the system and
refrigerant charging during after-sale maintenance.
Pipe connection diagram of outdoor modules
2. Each ODU system can be connected to multiple IDUs. Detailed information about the number of units to
be connected and capacity ranges is shown in the following table:
Max number of connectable
IDU (unit)
Capacity Range of Connected IDU (kW)
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