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GMV5 HR HEAT RECOVERY
VRF Units Technical Sales Guide
Communication connection mode of the multi-module system
NOTES:
a. For the modular outdoor unit, if multiple outdoor unit modules are available, the master unit must be
the first outdoor unit module on the communication line and cannot be connected to any indoor unit (the
master unit is set by SA8 of the main board for outdoor unit).
b. For the modular outdoor unit, if multiple outdoor unit modules are available, the indoor unit must
be connected to the last slave module of outdoor unit (the slave unit is set by SA8 of the main board for
outdoor unit).
c. The communication cable must be wired separately from the power cable to avoid interference.
d. A proper length of communication cable must be selected, and no joint is allowed.
e. The indoor units must be connected in series, and the last indoor unit must be connected to a
communication matching resistor (which is provided in the list of outdoor unit accessories).
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