DC Inverter Multi VRF System
20
pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure increase
of the pipe, then set the unit in cooling startup and fill refrigerant from the low pressure check valve
of the outdoor unit.
（3） Calculation example
Fig. 27
IDU
Liquid pipe:
Total length of each liquid pipe
Φ9.52：A+B+C+a=10+105+5+3=23m
Φ6.35: D+b+c+d=5+3+2+1=11m
Therefore, the minimum quantity of additional refrigerant = 23×0.054+11×0.022＝1.264kg
4.5 Electric Wiring
4.5.1 Notices for Wiring
（1） Install units according to national wiring codes.
（2） Use air conditioner specialized power supply and make sure that it is consistent with
system’s rated voltage.
（3） Do not pull the power cord with force.
（4） All electrical installation must be performed by qualified technicians in accordance with
local laws, regulations and this user manual.
（5） Caliber of the power cord must be large enough. A damaged power cord or connection
wire must be replaced by specialized electrical cords.
（6） If the supply cord is damaged, it must be replaced by the manufacturer or its service
agent or a similarly qualified person in order to avoid a hazard;
（7） A circuit breaker having a contact separation of at least 3mm in all poles should be
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