Mitsubishi Electric PUHY-P200 Service Handbook page 143

[6-9 Evaluating and Adjusting Refrigerant Charge ]
(2) Example: PUHY-P350YKB-A1
Indoor 1: P125
The total length of liquid pipe of each size is as follows:
ø12.7: A + e = 40 + 10 = 50 m
ø9.52: B + C + D + a + b + d = 10 + 15 + 10 + 10 + 5 + 10 = 60 m
ø6.35: c = 10 = 10 m
A
(3) Sample calculation
Total length of liquid
Additional
refrigerant charge
=
x 0.26 (kg/m)
(kg) 0 (m) x 0.26 (kg/m)
=
= 12.5 (12.45) kg
CAUTION
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and may
result in performance loss.
HWE14040
a: ø9.52
A: ø12.7 40 m
2: P100 B: ø9.52 10 m b: ø9.52
3: P40 C: ø9.52 15 m c: ø6.35
4: P32 D: ø9.52 10 m d: ø9.52
5: P63 e: ø12.7
B
a b
P125 P100
Total length of liquid
+
x 0.18 (kg/m)
0 (m) x 0.18 (kg/m)
0 + 0
10 m
5 m
10 m
10 m
10 m
C D
c
P40
Total length of liquid Total length of liquid
+ +
x 0.11 (kg/m) x 0.054 (kg/m)
50 (m) x 0.11 (kg/m) 60 (m) x 0.054 (kg/m)
+ 50 x 0.11 +
- 134 -
e
d
P32 P63
Total length of liquid
+
x 0.021 (kg/m)
10 (m) x 0.021 (kg/m)
60 x 0.054 + 10 x 0.021
+ 0 + 3.5
+ 0 + 3.5
GB