17
●
Example of each tubing length
Main tubing
Distribution joint tubing
LA = 131 ft. (40m)
Outdoor side
Indoor side
LB = 16 ft.
(4.9m)
A = 7 ft. (2.1m)
1 = 98 ft. (30m)
1-1 = 82 ft. (25m)
LC = 16 ft. (4.9m)
B = 7 ft.
(2.1m)
2 = 16 ft. (4.9m)
2-1 = 13 ft. (4m)
3 = 16 ft. (4.9m)
3-1 = 13 ft. (4m)
4 = 65 ft. (19.8m)
4-1 = 49 ft. (15m)
1
2
3
4
LA
LB
LC
A
B
1-1
2-1
3-1
4-1
Type 96
Type 72
Type 48
Type 48
Type 48
Type 36
●
Obtain liquid tubing size from Tables 3, 4, 5, 7 and 10.
Main tubing
LA = ø5/8 (in.) (Total capacity of indoor unit is 179,400 BTU/h (52.6kW))
LB = ø1/2 (in.) (Total capacity of indoor unit is 131,600 BTU/h (38.6kW))
LC = ø3/8 (in.) (Total capacity of indoor unit is 83,800 BTU/h (24.6kW))
Distribution joint tubing
Outdoor side
A: ø3/8 (in.)
B: ø3/8 (in.) (from outdoor unit connection tubing)
Indoor side
1-1: ø3/8 (in.)
2-1: ø3/8 (in.)
3-1: ø3/8 (in.)
4-1: ø3/8
(in.) (from indoor unit connection tubing)
●
Obtain discharge tubing size from Tables 3, 4 and 12.
Main tubing
LA = ø7/8 (in.) LB = ø7/8 (in.) LC = ø5/8 (in.)
Distribution joint tubing
Outdoor side
A: ø5/8 (in.)
B: ø3/4 (in.) (from outdoor unit connection tubing)
Indoor side
1: ø5/8 (in.)
2: ø5/8 (in.)
3: ø5/8 (in.)
4: ø5/8 (in.) (from solenoid valve kit connection tubing)
●
Obtain additional charge amount for each tubing size and additional refrigerant charge amount for outdoor unit and all indoor units cooling capacity.
Note 1: The charge amounts per 1 ft. are different for each liquid tubing size.
ø5/8 (in.)
→
LA
: 131 ft. × 1.99 oz/ft.
=
261 oz
(40m × 185
g
/m =
7,400
g
)
ø1/2 (in.)
→
LB
: 16 ft. × 1.38 oz/ft.
=
22 oz
(4.9m × 128
g
/m =
627
g
)
ø3/8 (in.)
→
LC + A +
B +
1 + 2 + 3+ 4
: 225 ft. × 0.602 oz/ft.
=
135 oz
(68.6m × 56
g
/m =
3,842
g
)
Total 418 oz
(Total 11,869
g
)
Additional refrigerant charge amount is 418 oz (11,869
g
).
Note 2: Necessary amount of additional refrigerant charge per outdoor unit is 141oz (4,000
g
) in combination of 2 units. (See Table 11.)
Note 2) Amount of additional charge for outdoor unit (combination number)
:
141oz
(4,000
g
)
Note 3: Necessary amount of additional refrigerant charge for all indoor unit cooling capacity
[BTU/h]
[kW]
179,400 BTU/h
Cooling capacity (BTU/h) x 1.034 x 0.001 + 10.6 oz
= 179,400 x 1.034 x 0.001 + 10.6 = 196 oz
(52.6 kW)
(Cooling capacity (kW) x1000 x 0.1 + 300
g
= 52.6 x 1000 x 0.1 + 300 = 5,560
g
)
Note 4: The charge amounts per 1 ft. are different for each discharge tubing size.
ø7/8 (in.)
→
LA + LB
: 147 ft. × 0.441 oz/ft.
=
65 oz
(44.9m × 41
g
/m =
1,841
g
)
ø3/4 (in.)
→
B
: 7 ft. × 0.333 oz/ft.
=
2 oz
(2.1m × 31
g
/m =
65
g
)
ø5/8 (in.)
→
LC + A
: 23 ft. × 0.226 oz/ft.
=
5 oz
(7m × 21
g
/m
=
147
g
)
ø1/2 (in.)
→
1-1 + 2-1 + 3-1 + 4-1
: 157 ft. × 0.129 oz/ft.
=
20 oz
(47.9m × 12
g
/m =
575
g
)
Total 92 oz
(Total 2,628
g
)
Additional refrigerant charge amount is 92 oz (2,628
g
).
Note 1) Amount of additional charge per liquid tubing length
:
418 oz
(11,869
g
)
Note 2) Amount of additional charge for outdoor unit (combination number)
:
141 oz
(4,000
g
)
Note 3) Amount of additional charge for all indoor unit cooling capacity
:
196 oz
(5,560
g
)
Note 4) Amount of additional charge per discharge tubing length
:
92 oz
(2,628
g
)
Total of additional refrigerant charge amount
:
847 oz
(24,057
g
)
Therefore, the total of additional refrigerant charge amount reaches 847 oz (24,057
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) :
:
[168,000BTU/h]
586 oz
[49.2kW] (16,600
g
)
Total of additional refrigerant charge amount
:
847 oz
(24,057
g
)
Grand total
1,433 oz
(40,657
g
)
Therefore, overall refrigerant charge amount of the system reaches 1,433 oz (40,657
g
).
Remark:
Be sure to include the values in Table 11 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit.
CAUTION
CAUTION
Be sure to check the limit density for the room in which the indoor unit is installed.
Example:
Outdoor unit
Solenoid valve kit
01_302412_Eng.indd 17
2018/7/4 13:30:29
