Mitsubishi Electric City Multi PURY-P72TLMU-A Manuel D'installation page 28

・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 ø28.58
additional charge =
total length × 0.33 (kg/m)
(kg)
Liquid pipe ø12.7 total
+
length × 0.11 (kg/m)
Total capacity of outdoor
units
P72
+
P96
P120
P144–P336
Number of sub BC
controllers
+
* When connecting PLFY-P08NBMU-E2, add 0.3 kg of refrigerant per indoor unit.
<Example>
Outdoor unit 1 model: P120
Outdoor unit 2 model: P120
Total capacity of connected indoor units: 206
* Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
A: ø28.58; 40 m
B: ø9.52; 10 m
C: ø9.52; 20 m
D: ø9.52; 5 m
E: ø9.52; 5 m
A : ø19.05; 3 m
1
A : ø19.05; 1 m
2
a: ø9.52; 10 m
b: ø9.52; 5 m
c: ø6.35; 5 m
d: ø6.35; 10 m
e: ø9.52; 5 m
f: ø9.52; 5 m
The total length of the high-pressure piping and liquid piping in each case is as follows:
ø28.58 total length: 40 (A)
ø19.05 total length: 3 (A ) + 1 (A
1
ø9.52 total length: 10 (B) + 20 (C) + 5 (D) + 5 (E) + 10 (a) + 5 (b) + 5 (e) + 5 (f) = 65
ø6.35 total length: 5 (c) + 10 (d) = 15
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 = (40 × 0.33) + (4 × 0.14) + (65 × 0.054) + (15 × 0.021) + 6 + 2 + 5 + 2
WT07598X02
High-pressure pipe ø22.2
+
total length × 0.21 (kg/m)
Liquid pipe ø9.52 total
+
length × 0.054 (kg/m)
Amount (kg)
(to be added for standard or main BC
controller)
3.0
4.5
4.5
6.0
Amount (kg)
(to be added for sub BC
controller)
1 1.0
2 2.0
) = 4
2
= 32.2 kg (Fractions are rounded up.)
High-pressure pipe ø19.05 High-pressure pipe ø15.88
+ +
total length × 0.14 (kg/m) total length × 0.1 (kg/m)
Liquid pipe ø6.35 total
+
length × 0.021 (kg/m)
Main BC controller
+
HA-type
Total capacity of connected indoor
units
27 or below
28 to 54
55 to 126
127 to 144
145 to 180
+
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 450
451 or above
GB-26
Liquid pipe ø15.88 total
+
length × 0.18 (kg/m)
Amount (kg)
2.0
Amount (kg)
(to be added for indoor unit)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0