21
3
Refrigerant piping design
3-4.
Charging requirement with additional refrigerant
(3)
Branching section
Indoor unit
Indoor unit
connecting
pipe
Connecting pipe size of indoor unit
(4)
Branching section
Y-shaped
branching
joint
Selection of branching section (Y-shaped branching joint)
(5)
Branching section
Branching
header
Selection of branching section (Branching header)
*
A capacity code of up to a maximum of 57 is connectable to one line after
branching from the header.
Capacity rank
Gas pipe
Liquid pipe
007 to 012 type Ø3/8"
Ø1/4"
015 to 018 type
Ø1/2"
Ø1/4"
021 to 048 type
Ø5/8"
Ø3/8"
Model name
Y-shape branch joint
RBM-BY55UL
Model name
Branching header*
For 4 branches
RBM-HY1043UL
For 8 branches
RBM-HY1083UL
Adding refrigerant
After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of refrigerant.
Calculation of additional refrigerant charge amount
Default refrigerant amount does not include the refrigerant for pipes at the local site.
For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.
Table 1
Table 2
Example: (060 type)
Additional charge amount R (kg)
Lx: Real total length of liquid pipe diameter
1/4"
(ft)
Ly: Real total length of liquid pipe diameter
3/8"
(ft)
= {( Lx × 0.017 lbs/ft ) + ( Ly × 0.038 lbs/ft )} × 1.2 + ( 1.76 lbs )
= {( 39.3 × 0.017 lbs ) + ( 91.8 × 0.038 lbs )} × 1.2 + ( 1.76 lbs )
= 6.75 lbs
Outdoor unit type
MAP0367
MAP0487
MAP0607
Charging amount (lbs (kg))
14.8 (6.7)
14.8 (6.7)
14.8 (6.7)
Additional
refrigerant charge
amount at local site
=
Real length of liquid
pipe
×
Additional refrigerant
charge amount per
1 ft liquid pipe
(Table 1)
×
1.2
+
Compensation by
outdoor HP
(Table 2)
Liquid pipe dia. (in)
Ø1/4"
Ø3/8"
Additional refrigerant amount /
1 m liquid pipe (lbs/ft)
0.017
0.038
7
0
6
0
P
A
M
7
8
4
0
P
A
M
7
6
3
0
P
A
M
e
p
y
t
t
i
n
u
r
o
o
d
t
u
O
Compensation by outdoor capacity (lbs (kg))
0 (0)
0.88 (0.4)
1.76 (0.8)
L1
Ø3/8": 32.8 ft
L2
Ø3/8": 32.8 ft
L3
Ø3/8": 16.4 ft
L4
Ø3/8": 9.8 ft
L5
Ø1/4": 9.8 ft
L6
Ø1/4": 13.1 ft
L7
Ø1/4": 16.4 ft
L1
L2
L3
L4
L5
L6
L7
D
C
B
A
E16-3P1_databook.book Page 21 Tuesday, December 20, 2016 3:02 PM
