18
Example:
1 2 3 4 5 6 7
LO
LA
LB
LC
LD
LE
LF
A
B
C
● Example of each tubing length
Main tubing Distribution joint tubing
LO = 2 m LD = 15 m Outdoor side Indoor side
LA = 40 m LE = 10 m
A = 2 m 1 = 30 m 5 = 2 m
LB = 5 m LF = 10 m
B = 2 m 2 = 5 m 6 = 6 m
LC = 5 m
C = 3 m 3 = 5 m 7 = 5 m
4 = 5 m
Note :The maximum tubing length (equivalent length) exceeds 90 m.
● Obtain liquid tubing size from Tables 3, 4, 5, 6 and 9.
Main tubing
LO = ø19.05 mm (Total capacity of outdoor unit is 73.5 kW) LD = ø15.88 mm (Total capacity of indoor unit is 53.3 kW)
LA*= ø22.22 mm (Total capacity of outdoor unit is 118.0 kW) LE = ø12.7 mm (Total capacity of indoor unit is 37.3 kW)
LB = ø19.05 mm (Total capacity of indoor unit is 77.9 kW) LF = ø9.52 mm (Total capacity of indoor unit is 21.3 kW)
LC = ø15.88 mm (Total capacity of indoor unit is 67.3 kW)
The longest main tubing length in this example (LM = 40 + 5 = 45 m)
* The tubing size ø19.05 was increased to ø22.22.
Distribution joint tubing
Outdoor side
A: ø12.7 B: ø12.7 C: ø9.52 (from outdoor unit connection tubing)
Indoor side
1: ø9.52 2: ø9.52 3: ø9.52 4: ø9.52
5: ø9.52 6: ø9.52 7: ø9.52 (from indoor unit connection tubing)
● Obtain additional charge amount.
Note 1*
The charge amounts per 1 meter are different for each liquid tubing size.
ø22.22 → LA : 40 m ×0.366 kg/m = 14.640
ø19.05 → LB + LO : 7 m ×0.259 kg/m = 1.813
ø15.88 → LC + LD : 20 m ×0.185 kg/m = 3.7
ø12.7 → LE +
A + B
: 14 m ×0.128 kg/m = 1.792
ø9.52 →
C + LF +( 1 – 7)
: 71 m ×0.056 kg/m = 3.976
Note 2*
Total
25.921 kg
Necessary amount of additional refrigerant charge per outdoor unit (See the Table 10.)
Amount of additional charge per outdoor unit : U-10ME2R8(E)
_
kg
U-16ME2R8(E) 4.0
kg
U-16ME2R8(E) 4.0
kg
Therefore,
Total 8.0
kg
*Note 1 : Amount of additional charge per tubing length : 25.921
kg
*Note 2 : Amount of additional charge per outdoor unit : 8.0
kg
Therefore, the total of additional refrigerant charge amount reaches 33.921 kg.
● 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 11) at the shipment of each outdoor unit.
Refrigerant charge amount at shipment:
U-10ME2R8(E) : 11.1
kg
U-16ME2R8(E) : 11.3
kg
U-16ME2R8(E) : 11.3
kg
Additional charge amount : 33.921 kg
Grand total : 67.621 kg
Therefore, overall refrigerant charge amount of the system reaches 67.621 kg.
Outdoor unit
160 type 106 type 140 type 160 type
160 type
73 type 140 type
10 HP
type
16 HP
type
16 HP
type
00_340994_2WAY_Eng.indb 18 2022/8/4 14:28:30
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