Panasonic U-8ME2R8 Installation Instructions Manual page 18

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