Mitsubishi Electric PUHY-P1000, Service Handbook

Page: 143 / 334

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