Mitsubishi Electric CITY MULTI PURY-P-ZKMU-A Installation Manual page 27

・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–P288
Number of sub BC
controllers
+
1
2
* 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 + 11
WT07828X01
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)
Total capacity of
(to be added for
connected indoor units
sub BC controller)
1.0 27 or below
2.0 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
) = 4
2
= 41.2 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
Amount (kg)
(to be added for
indoor unit)
2.0
Single
+
2.5
3.0
3.5 Combination
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
GB-25
Liquid pipe ø15.88 total
+
length × 0.18 (kg/m)
Amount (kg)
2.0
Amount (kg)
Outdoor unit model (to be added for
outdoor unit)
P72 to P96 0
P120 to P144 5.5
P168 to P192 0
P216 5.5
P240 to P288 11.0