Mitsubishi PUHY-EP250 - Page 133

[6-9 Evaluating and Adjusting Refrigerant Charge ]
- 124 -
HWE12050 GB
(2) Example: PUHY-EP450YSKM-A
(3) Sample calculation
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.
[5/8"][98 ft]
[5/8"] [32 ft]
[3/8"][32 ft]
9.52
(20 m)
9.52
(10 m)
9.52
(10 m)
9.52
(10 m)
6.35
(10 m)
9.52 (10 m)
[3/8"]
[32 ft]
[3/8"]
[3 ft]
[3/8"]
[9 ft]
[3/8"]
[32 ft]
[1/4"]
[32 ft]
[3/8"]
[32 ft]
[3/8"]
[65 ft]
15.88 (10 m)
15.88 (30 m)
9.52
(3 m)
9.52
(1 m)
×
×
250
model
125
model
80
model
63
model
20
model
250
model
125
model
80
model
63
model
20
model
Liquid
separator
Liquid
separator
All the pipes in the figure are liquid pipes.
15.88 : 30 m + 10 m = 40 m
9.52 : 3 m + 1m + 10 m + 10 m + 20 m + 10 m + 10 m = 64 m
6.35 : 10 m
β for EP450 (outdoor unit model name) : 2.0
The calculation result would be 19.08, and it is rounded up to the nearest 0.1.
The final result will be as follows:
Amount of refrigerant to be charged (kg) = (0.2 X 40) + (0.06 X 64) + (0.024 X 10) + 5.0 + 2.0= 19.08 kg
Amount of refrigerant to be charged = 19.1 kg
All the pipes in the figure are liquid pipes.
[5/8"] : [98 ft] + [32 ft] = [130 ft]
[3/8"] : [9 ft] + [3 ft] + [32 ft] + [32 ft] + [65 ft] + [32 ft] + [32 ft] = [205 ft]
[1/4"] : [32 ft]
β' for EP450 (outdoor unit model name) : 71
The calculation result would be 669.07 oz, and it is rounded up to the nearest 1 oz.
The final result will be as follows:
Amount of refrigerant to be charged (oz) = (2.15 X 130) + (0.65 X 205) + (0.26 X 32) + 177 + 71 = 669.07 oz
Amount of refrigerant to be charged = 670 oz