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Obtain liquid tubing size from Tables 1-3, 4, 5, 7 and 10-1.
Main tubing
LA = ø5/8 (ft.) (Total capacity of indoor unit is 179,400 BTU/h) The longest tubing length in this example
LB = ø1/2 (ft.) (Total capacity of indoor unit is 131,600 BTU/h) (LA = 131 ft.)
LC = ø3/8 (ft.) (Total capacity of indoor unit is 83,800 BTU/h)
Distribution joint tubing
Outdoor side A: ø3/8 (ft.) B: ø3/8 (ft.) (from outdoor unit connection tubing)
Indoor side 1: ø3/8 (ft.) 2: ø3/8 (ft.) 3: ø3/8 (ft.) 4: ø3/8 (ft.) (from indoor unit connection tubing)
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Obtain additional charge amount for each tubing size.
Note 1: The charge amounts per 1 ft. are different for each liquid tubing size.
ø5/8 (ft.)
→ LA : 131 ft. × 1.99 oz/ft. = 261 oz
ø1/2 (ft.)
→ LB : 16 ft. × 1.38 oz/ft. = 22 oz
ø3/8 (ft.)
→ LC + A – B + 1 – 4 : 225 ft. × 0.602 oz/ft. = 135 oz
Total 418 oz
Additional refrigerant charge amount is 418 oz.
Note 2: Necessary amount of additional refrigerant charge per outdoor unit (U-96ME1U9) is 42 oz. (See the Table 1-10-2.)
Note 1) Amount of additional charge per tubing length : 418 oz
Note 2) Amount of additional charge for outdoor unit : 84 oz (42+42)
Total of additional refrigerant charge amount : 502 oz
Therefore, the total of additional refrigerant charge amount reaches 502 oz.
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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 of the refrigerant charge amount (shown in the Table 1-6) at the shipment of each outdoor unit.
Refrigerant charge amount at shipment:
U-96ME1U9 : 416 oz
U-96ME1U9 : 416 oz
Additional charge amount : 502 oz
Grand total : 1334 oz
Therefore, overall refrigerant charge amount of the system reaches 1334 oz.
15
Be sure to check the limit density for the
room in which the indoor unit is installed.
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