Technical Data Manual

Design of Mini VRF SYSTEM
2 - 20
1
8
7
6
5
4
3
2
2. System Design
●
Obtain charge amount for each tubing size
Note that the charge amounts per 3.3 ft. are different for each liquid tubing size.
ø3/8" (ø9.52)
→
LA + LB + LC + LD : 212 ft.
×
0.602 oz/ft. = 127 oz
ø1/4" (ø6.35)
→
1 + 2 + 3 + 4 + 5 : 75 ft.
×
0.279 oz/ft. = 20 oz
Total 147 oz
Additional refrigerant charge amount is 147 oz.
Be sure to check the limit density
for the room in which the indoor
unit is installed.
CAUTION
●
Example of each tubing length
Main tubing Distribution joint tubing
LA = 131 ft. Indoor side
LB = 16 ft. 1 = 16 ft. 4 = 20 ft.
LC = 16 ft. 2 = 16 ft. 5 = 16 ft.
LD = 49 ft. 3 = 7 ft.
LN
L1
L2
LCLB
LA
Main tube of unit
1st branch
model 7 model 9 model 12 model 18
model 18
Unit distribution tube
1
23
n–1
n
Example:
TD831156-00_MINI_VRF_SYS.indb 20TD831156-00_MINI_VRF_SYS.indb 20 2012/01/31 14:38:462012/01/31 14:38:46