Mitsubishi Electric CITY MULTI PURY-P-YNW-A2 Installation Manual page 42

・When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of High-pressure pipe
additional = ø1-3/8 total length
charge (oz) × 5.60 (oz/ft)
Liquid pipe ø3/4
+ total length
× 2.80 (oz/ft)
Main or sub BC
controller
J(1)-type
+
JA(1)-type
KA(1)-type
KB(1)-type
* When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft), additional refrigerant charge shown in
"Additional refrigerant charge" is not necessary.
* Contact your dealer for the amount of refrigerant to be added when connecting CMB-P**-V-G1, CMB-P**-V-GA1, CMB-P**-V-HA1, CMB-P**-
V-GB1, or CMB-P**-V-HB1.
* When connecting LEV kit (PAC-LV11M-J), additional refrigerant charge may be required. Refer to the installation manual of the LEV kit.
<Example>
Outdoor unit 1 model: EP300YNW
Outdoor unit 2 model: EP300YNW
BC controller (Main) model: CMB-M108V-JA1
BC controller (Sub) model: CMB-M104V-KB1 × 4 units
Total capacity of connected indoor units: 530
* Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
A: ø1-1/8; 131 ft
B: ø3/8; 32 ft
C: ø3/8; 16 ft
D: ø3/8; 16 ft
E: ø3/8; 16 ft
F: ø3/8; 16 ft
G: ø3/8; 16 ft
H: ø3/8; 16 ft
J: ø3/8; 16 ft
The total length of the high-pressure piping and liquid piping in each case is as follows:
ø1-1/8 total length: 131 (A)
ø3/4 total length: 9 (A ) + 3 (A
1
ø3/8 total length: 32 (B) + 16 (C) + 16 (D) + 16 (E) + 16 (F) + 16 (G) + 16 (H) + 16 (J) + 32 (a) + 16 (b) + 16 (f) + 16 (g) + 16 (h) = 240
ø1/4 total length: 16 (c) + 32 (d) + 16 (e) = 64
Therefore, when the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft),
Amount of additional charge = (131 × 3.54) + (12 × 1.51) + (240 × 0.59) + (64 × 0.23) + 106 + (15 × 4) + 177
WT09973X01
High-pressure pipe
+ ø1-1/8 total length
× 3.54 (oz/ft)
Liquid pipe ø5/8
+ total length
× 1.94 (oz/ft)
Amount (oz/unit)
53
106
166
15
A : ø3/4; 9 ft
1
A : ø3/4; 3 ft
2
a: ø3/8; 32 ft
b: ø3/8; 16 ft
c: ø1/4; 16 ft
d: ø1/4; 32 ft
e: ø1/4; 16 ft
f: ø3/8; 16 ft
g: ø3/8; 16 ft
h: ø3/8; 16 ft
) = 12
2
= 981.2 oz (Fractions are rounded up.)
High-pressure pipe High-pressure pipe
+ ø7/8 total length + ø3/4 total length
× 2.26 (oz/ft) × 1.51 (oz/ft)
Liquid pipe ø1/2 Liquid pipe ø3/8
+ total length + total length
× 1.19 (oz/ft) × 0.59 (oz/ft)
Total capacity of connected
indoor units
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
+
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
41
High-pressure pipe
+ ø5/8 total length
× 1.08 (oz/ft)
Liquid pipe ø1/4
+ total length
× 0.23 (oz/ft)
Amount (oz)
(to be added for
indoor unit)
71
89
106
124
159
177
212
283
318
353
424
494