Specifications

3. Piping Design
DATA U10
4 - 27SYSTEM DESIGN
S.D. S
Example:
PUMY-P60NKMU
Additional refrigerant charge
Refrigerant for the extended piping is not included in the outdoor unit when the unit is shipped from the factory.
Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service,
enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces provided on the “Refrigerant amount”
plate on the outdoor unit.
Calculation of additional refrigerant charge
• Calculate the additional charge using the liquid pipe size and length of the extended piping.
• Calculate the additional refrigerant charge using the procedure shown to the right, and charge with the additional refrigerant.
• For amounts less than 0.1 kg, round up the calculated additional refrigerant charge.
(For example, if the calculated charge is 32.92 kg, round up the charge to 33.0 kg.)
3-3-2. PUMY-P-NKMU
P24
P15 P08
P06
P06
A ( 30 m [98 ft.] )
b ( 10 m [32 ft.] )
d ( 20 m [65 ft.] )
e ( 15 m [49 ft.] )
c ( 10 m [32 ft.] )
a ( 15 m [49 ft.] )
=++
[oz]
Additional
refrigerant charge
Pipe size
Liquid pipe ø6.35
Pipe size
Liquid pipe ø9.52
(kg)
(m) × 0.027 (kg/m)
0.29 (oz/ft)
(m) × 0.07 (kg/m)
0.75 (oz/ft)
– 42 2.0 kg (71 oz)
43 – 60 2.5 kg (88 oz)
61 – 78 3.0 kg (106 oz)
Total capacity of
connected indoor units
Amount for the
indoor units
Indoor 1: P24 A=ø9.52 [3/8"] 30 m [98 ft.] a=ø9.52 [3/8"] 15 m [49 ft.]
Indoor 2:
P15
b=ø6.35 [1/4"] 10 m [32 ft.]
Indoor 3: P08 c=ø6.35 [1/4"] 10 m [32 ft.]
Indoor 4: P06 d=ø6.35 [1/4"] 20 m [65 ft.]
Indoor 5: P06 e=ø6.35 [1/4"] 15 m [49 ft.]
Total length of each liquid pipe is as follows
ø9.52 [3/8"] A + a = 30 [98] + 15 [49] = 45 m [147 ft.]
ø6.35 [1/4"] b + c + d + e = 10 [32] + 10 [32] + 20 [65] + 15 [49] = 55 m [180 ft.]
=++
++
(kg) 45 (m) x 0.07 (kg/m)
Additional
refrigerant charge
= 3.15
= 7.14
7.2
kg (round-up)
1.49 2.5
Total length of liquid
pipe sized
ø9.52 x 0.07 (kg/m)
55 (m) x 0.027 (kg/m)
Total length of liquid
pipe sized
ø6.35 x 0.027 (kg/m)
=++
++
(oz) 147 (ft.) x 0.75 [oz/ft.]
Additional
refrigerant charge
= 110.25
= 250.45 [oz]
251 [oz] (round-up)
52.2 88
Total length of liquid
pipe sized
ø3/8" x 0.75 [oz/ft.]
180 (ft.) x 0.29 [oz/ft.]
Total length of liquid
pipe sized
ø1/4" x 0.29 [oz/ft.]
– 42 2.0 kg (71 oz)
43 – 60 2.5 kg (88 oz)
61 – 78 3.0 kg (106 oz)
Total capacity of
connected indoor units
Amount for the
indoor units
– 42 2.0 kg (71 oz)
43 – 60 2.5 kg (88 oz)
61 – 78 3.0 kg (106 oz)
Total capacity of
connected indoor units
Amount for the
indoor units