Lennox VRF VEC027N432U, User Manual, Page: 22 / 36

DC Inverter Multi VRF System
18
(3) Calculation example.
Fig 4.5.2.1
IDU:
No.
IDU
①
IDU
②
IDU
③
IDU
④
Model
Duct type
VESD024N432U
Duct type
VESD017N432U
Duct type
VESD012N432U
Duct type
VESD008N432U
Liquid pipe:
No. A B C D
Pipe size Φ9.52 Φ9.52 Φ9.52 Φ6.35
Length 10m 5m 5m 5m
No. a b c d
Pipe size Φ9.52 Φ6.35 Φ6.35 Φ6.35
Length 3m 3m 2m 1m
Total length of each liquid pipe
Φ9.52 : A+B+C+a=10+5+5+3=23m
Φ6.35: D+b+c+d=5+3+2+1=11m
Quantity of indoor unit: 4 sets
Therefore, the minimum quantity of additional refrigerant = (23×0.054+11×0.022)+(4-2) ×0.3=
2.084kg
4.6 Electric Wiring
4.6.1 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.