GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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Low
Pressure
Gauge
High
Pressure
Gauge
Oil
Detection
Valve
Low-
pressure
Detection
Valve
2.3.2.3 Electrical System Check
1) Check for high electromagnetic interference, dusts, and acidic or alkaline gas in the unit
environment.
a. The air conditioning unit can neither share the same power supply system with the equipment
containing variable-frequency drives, nor reside near the equipment generating high electromagnetic
interference. Otherwise, the air conditioning unit may fail to properly work due to interference. If this case
exists, records should be made. In the case of serious influence, the air conditioning unit must be
relocated or relevant measures must be taken.
b. Prevent acidic or alkaline gas/liquid from rusting cables of the air conditioning unit.
2) Check the installation appearance of power cables.
Check whether power cables of indoor and ODUs are installed according to vendor requirements
and whether cable connectors are reliably connected. Except the connection part of patch panels, wire
exposure is not allowed on any connection part of power cables.
3) Check the power capacity required for the unit.
The air conditioning unit works at a current much larger than the rated current (the working current
changes in a large scope in different conditions). The power grid provides unstable voltages and the line
power factor decreases. Therefore, the power capacity should not be less than the maximum power of
the unit.
4) Check air switches and fuse links for their models and using methods.
a. Commercial air conditioning units must be installed with independent air switches, fuse links, and
similar protectors. Reasonable models and using methods should be selected for air switches and fuse
links.
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