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Example:
● Example of all outdoor units
cooling capacity
Outdoor unit
Type 72: 72,000 BTU/h
Type 96: 96,000 BTU/h
Type 96
Type 72
[Total] 168,000 BTU/h
B
A
LA
Type 48
● Obtain liquid tubing size from Tables 1-3, 4, 5, 7 and 10-1.
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.)
Indoor side
1: ø3/8 (in.)
● Obtain additional charge amount for each tubing size and additional refrigerant charge amount for all indoor unit cooling capacity.
Note 1: The charge amounts per 1 ft. are different for each liquid tubing size.
ø5/8 (in.)
→ LA
ø1/2 (in.)
→ LB
→ LC +
ø3/8 (in.)
Additional refrigerant charge amount is 418 oz (11,869g).
Note 2: Necessary amount of additional refrigerant charge per outdoor unit is 141oz (4,000g) in combination of 2 units.
(See the Table 1-10-2.)
Note 2) Amount of additional charge for outdoor unit (combination number)
Note 3: Necessary amount of additional refrigerant charge for all indoor unit cooling capacity
[BTU/h]
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
Note 1) Amount of additional charge per tubing length
Note 2) Amount of additional charge for outdoor unit (combination number)
Note 3) Amount of additional charge for all indoor unit cooling capacity
Total of additional refrigerant charge amount
Therefore, the total of additional refrigerant charge amount reaches 755 oz (21,429g).
● 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 the Table 1-6) at shipment in total cooling capacity of outdoor unit.
Refrigerant charge amount at shipment
(total cooling capacity of outdoor unit) :
Total of additional refrigerant charge amount
Therefore, overall refrigerant charge amount of the system reaches 1,439 oz (40,829g).
Remark:
Be sure to include the values in Table 1-10-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit.
CAUTION
Be sure to check the limit density for the room in which the indoor unit is installed.
00_302411_EN.indd 16
(21.1 kW)
(28.1 kW)
(49.2 kW)
LC
LB
1
2
3
Type 48
Type 48
Type 36
B: ø3/8 (in.) (from outdoor unit connection tubing)
2: ø3/8 (in.)
3: ø3/8 (in.)
: 131 ft. × 1.99 oz/ft. = 261 oz
: 16 ft. × 1.38 oz/ft.
: 225 ft. × 0.602 oz/ft. = 135 oz
A – B +
1 – 4
Grand total
● Example of each tubing length
Main tubing
LA = 131 ft. (40m)
LB = 16 ft. (4.9m)
A = 7 ft. (2.1m)
LC = 16 ft. (4.9m)
B = 7 ft. (2.1m)
4
● Example of all indoor unit cooling capacity
[Type 48 x 3] 47,800 x 3 = 143,400 BTU/h
[Type 36 x 1] 36,000 x 1 = 36,000 BTU/h
[Total]
4: ø3/8 (in.) (from indoor unit connection tubing)
= 22 oz
Total 418 oz
: 141oz
[kW]
(52.6 kW)
(Cooling capacity (kW) x1000 x 0.1 + 300g
= 52.6 x 1000 x 0.1 + 300 = 5,560 g)
: 418 oz
: 141 oz
: 196 oz
: 755 oz
:
[168,000BTU/h]
684 oz
755 oz
:
1,439 oz
16
Distribution joint tubing
Outdoor side
Indoor side
1 = 98 ft. (30m)
2 = 16 ft. (4.9m)
3 = 16 ft. (4.9m)
4 = 65 ft. (19.8m)
(14.0 x 3 = 42.0 kW)
(10.6 x 1 = 10.6 kW)
179,400 BTU/h
(52.6 kW)
(40m × 185 g/m = 7,400g)
(4.9m × 128 g/m =
627g)
(68.6m × 56 g/m = 3,842g)
(Total 11,869g)
(4,000g)
(11,869g)
(4,000g)
(5,560g)
(21,429g)
[49.2kW] (19,400g)
(21,429g)
(40,829g)
2018/7/4 13:27:19
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