Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 193

[ VIII Test Run Mode ]
(2) Example: PUHY-P234TGMU-A
15.88 [3/4"](30 m [98 ft])
(3) Sample calculation
All the pipes in the figure are liquid pipes.
15.88 [3/4"] : 30 m [98 ft] + 10 m [32 ft] = 40 m [130 ft]
9.52 [3/8"] : 10 m [32 ft] + 2 0m [65 ft] + 20 m [65 ft] + 10 m [32 ft] + 10 m [32 ft] = 70 m [226 ft]
6.35 [1/4"] : 10 m [32 ft]
According to the above formula
Amount of refrigerant to be charged (kg) = (0.2 X 40) + (0.06 X 70) + (0.024 X 10) + 3 = 15.44kg
The calculation result would be 15.44, and it is rounded up to the nearest 0.1.
The final result will be as follows:
Amount of refrigerant to be charged = 15.5kg
Amount of refrigerant to be charged (oz) = (2.15 X 130) + (0.65 X 226) + (0.26 X 32) + 106 = 540.7oz
The calculation result would be 540.7oz, and it is rounded up to the nearest 1 oz or 4 oz.
The final result will be as follows:
Amount of refrigerant to be charged = 544oz or 541oz
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.
9.52 [3/8"](10 m [32 ft])
15.88 [3/4"](10 m [32 ft])
9.52 [3/8"] 9.52 [3/8"]
(20 m [65 ft]) (20 m [65 ft])
96 model 54 model
- 184 -
9.52 [3/8"] 9.52 [3/8"]
(10 m [32 ft]) (10m [32 ft])
24 model 06 model
30 model
6.35 [1/4"]
(10 m [32 ft])