19
1
2
3
4
LA
LB
LC
A
B
1-1
2-1
3-1
4-1
●
Example of each tubing length
Main tubing
Distribution joint tubing
LA =
40 m
Outdoor side
Indoor side
LB = 4.9 m
A= 2.1 m
1=
30 m
LC = 4.9 m
B= 2.1 m
2= 4.9 m
3= 4.9 m
4= 19.8 m
●
Obtain liquid tubing size from Tables 3, 4, 5, 6 and 9.
Main tubing
LA = ø15.88 m (Total capacity of indoor unit is 52.6kW)
LB = ø12.7 m (Total capacity of indoor unit is 38.6kW)
LC = ø9.52 m (Total capacity of indoor unit is 24.6kW)
Distribution joint tubing
Outdoor side
A: ø9.52 m
B: ø9.52 m (from outdoor unit connection tubing)
Indoor side
1-1: ø9.52 m
2-1: ø9.52 m
3-1: ø9.52 m
4-1: ø9.52 m (from indoor unit connection tubing)
●
Obtain discharge tubing size from Tables 3, 4 and 12.
Main tubing
LA =
ø22.22 m
LB =
ø22.22 m
LC =
ø15.88 m
Distribution joint tubing
Outdoor side
A: ø15.88 m
B: ø19.05 m (from outdoor unit connection tubing)
Indoor side
1: ø15.88 m
2: ø15.88 m
3: ø15.88 m
4: ø15.88 m (from solenoid valve kit connection tubing)
●
Obtain additional charge amount for each tubing size and additional refrigerant charge amount for outdoor unit.
Note 1: The charge amounts per 1 meter are different for each liquid tubing size.
ø15.88 m
→
LA
40 m × 185
g
/m = 7,400
g
ø12.7 m
→
LB
4.9 m × 128
g
/m =
627
g
ø9.52 m
→
LC + A + B + 1 + 2 + 3 +
4
68.7 m × 56
g
/m = 3,847
g
Total 11,874
g
Additional refrigerant charge amount is 11,874
g
.
Note 2: Necessary amount of additional refrigerant charge per outdoor unit is 2,000
g
in combination of 2 units. (See Table 10.)
Note 2) Amount of additional charge for outdoor unit (combination number)
: 2,000
g
Note 3: The charge amounts per 1 meter are different for each discharge tubing size.
ø22.22 m
→
LA + LB
44.9 m × 41
g
/m = 1,841
g
ø19.05 m
→
B
2.1 m × 31
g
/m =
65
g
ø15.88 m
→
LC +
A
7 m × 21
g
/m
=
147
g
ø12.7 m
→
1-1 + 2-1 +
3-1
+
4-1
48.0 m × 12
g
/m =
576
g
Total 2,629
g
Additional refrigerant charge amount is 2,629
g
.
Note 1) Amount of additional charge per liquid tubing length
: 11,874
g
Note 2) Amount of additional charge for outdoor unit (combination number)
: 2,000
g
Note 3) Amount of additional charge per discharge tubing length
: 2,629
g
Total of additional refrigerant charge amount
: 16,503
g
Therefore, the total of additional refrigerant charge amount reaches 16,503
g
.
●
Obtain overall refrigerant charge amount.
Overall refrigerant charge amount of the system indicates the calculated value shown above the additional charge amount in addition to
the total refrigerant charge amount (shown in Table 6) at shipment in total cooling capacity of outdoor unit.
Refrigerant charge amount at shipment
(Total cooling capacity of outdoor unit)
:
19,600
g
Total of additional refrigerant charge amount
:
16,503
g
Grand total
36,103
g
Therefore, overall refrigerant charge amount of the system reaches 36,103
g
.
Remark:
Be sure to include the values in Table 10 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit.
Example:
Outdoor unit
Solenoid valve kit
2-1=
4 m
3-1=
4 m
4-1=
15 m
1-1=
25 m
10 HP
8 HP
Type 140
Type 140
Type 140 Type 106
00_341136_2WAY_Eng.indb 19
2022/9/19 9:27:18
