Mitsubishi Electric SMART MULTI MXZ-SM36NAM2-U1 Data Book page 79

11. PIPING DESIGN
11-3-2. MXZ-SM60NAMHZ2ｰU1
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 below, 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 13.2 lb [6.01 kg], round up the charge to 13.4 lb [6.1 kg].)
• The amount of additional refrigerant for MXZ-SM60 which is calculated from the total capacity of indoor units and the combination of
extended pipes must not be over 28.4 lb [12.9 kg].
• When connecting a PAA-series unit(s), set additional constraints on the amount of additional refrigerant as follow.
Number of connecting PAA-･A
MXZ-SM60
Additional
refrigerant charge
=
(kg)
[oz]
Example:
MXZ-SM60NAMHZ2ｰU1
a ( 15 m [49 ft.] )
P24
Additional
refrigerant charge
=
(kg)
=
=
Additional
refrigerant charge
=
(oz)
=
=
M-P0890
1 unit 2 units
11.2 kg 395 oz 10.2 kg 359 oz 9.7 kg 342 oz
Pipe size Pipe size
Liquid pipe ø6.35 Liquid pipe ø9.52
+
(m) × 0.027 (kg/m) (m) × 0.07 (kg/m)
0.29 (oz/ft)
Indoor 1: P24
Indoor 2: P15
Indoor 3: P08
Indoor 4: P08
Total length of each liquid pipe is as follows
ø9.52 [3/8"]
ø6.35 [1/4"]
A ( 30 m [98 ft.] )
b ( 10 m [32 ft.] )
P 1 5
Total length of liquid Total length of liquid
pipe sized pipe sized
+
ø9.52 x 0.07 (kg/m) ø6.35 x 0.027 (kg/m)
45 (m) x 0.07 (kg/m) 40 (m) x 0.027 (kg/m)
3.15
+
7.23
7.3 kg (round-up)
Total length of liquid Total length of liquid
pipe sized pipe sized
+
ø ø
3/8" 0.75 [oz/ft.] 1/4"
x
148 (ft.) x 0.75 [oz/ft.] 131 (ft.) x 0.29 [oz/ft.]
111.00 +
254.99
255 [oz] (round-up)
3 units
Total capacity of
connected indoor units
+
– 27 kBtu/h
28 – 54 kBtu/h
0.75 (oz/ft)
55 – kBtu/h
A=ø9.52 [3/8"] 30 m [98 ft.] a=ø9.52 [3/8"] 15 m [49 ft.]
A + a = 30 + 15 = 45 m [148 ft.]
b + c + d = 10 + 10 + 20 = 40 m [131 ft.]
d ( 20 m [65 ft.] )
c ( 10 m [32 ft.] )
P 0 8
Total capacity of
connected indoor units
+ – 27 kBtu/h
28 – 54 kBtu/h
55 – kBtu/h
1.08 3.0
+
Total capacity of
connected indoor units
+ – 27 kBtu/h
0.29 [oz/ft.]
x
28 – 54 kBtu/h
55 – kBtu/h
37.99 + 106
Amount for the
indoor units
1.5 kg (53 oz)
2.5 kg (88 oz)
3.0 kg (106 oz)
b=ø6.35 [1/4"] 10 m [33 ft.]
c=ø6.35 [1/4"] 10 m [33 ft.]
d=ø6.35 [1/4"] 20 m [66 ft.]
P08
Amount for the
indoor units
1.5 kg (53 oz)
2.5 kg (88 oz)
3.0 kg (106 oz)
Amount for the
indoor units
1.5 kg (53 oz)
2.5 kg (88 oz)
3.0 kg (106 oz)
SMART MULTI
77