Mitsubishi Electric PUHY-P250YHM-A, Data Book

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83
1-2-3. PUHY-P-YHM's refrigerant charging calculation
Sample connection (with PFAV-P600VM-E-F)
Amount of refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the outdoor unit. Add an appropriate amount of refrigerant
for each pipe on site.
Record the size of each liquid pipe and the amount of refrigerant that was charged on the outdoor unit for future reference.
Calculating the amount of refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed liquid pipes and their length.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1kg. (i.e., 16.08 kg = 16.1 kg)
<Amount of refrigerant to be charged>
Calculating the amount of refrigerant to be charged
Amount of factory-
charged refrigerant
Sample calculation
Total length of ø19.05
liquid pipe x 0.29
(m)x0.29(kg/m)
+
Total length of ø15.88
liquid pipe x 0.2
(m)x0.2(kg/m)
A : ø9.52
B : ø9.52
C : ø15.88 3m
2m
2m
3.0kg
5.0kg
9.0kg
+
Total length of ø12.7
liquid pipe x 0.12
(m)x0.12(kg/m)
P250 model
11.5kg P350 model
11.5kg P400 model
Outdoor unit model Charged amount
Total length for ø15.88
each pipe size : ø9.52
C=2m
A+B=5m
=2x0.2+5x0.06+5.0
=5.7kg
This yields the following result :
+
Total length of ø9.52
liquid pipe x 0.06
(m)x0.06(kg/m)
+
Total length of ø6.35
liquid pipe x 0.024
(m)x0.024(kg/m)
+
P250, P300-F
P500, P600-F
8.0kg P750, P900-F
Model connected
indoorunits Amount for the
indoor unit
OU OU
IU
Note1. "-"
Note2. If the A/C system is designed to use Cooling-mode under Outside temperature 0˚C, H’<=15m.
Note3. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better;
Piping length needs to consider the actual length and equivalent length which bents are counted.
Equivalent piping length (m)=Actual piping "M" x Quantity of bent.
2m
To indoor unit
To indoor unit
To indoor unit max 2m To indoor unit
Trap (gas
pipe only)
Upward
incline Downward
incline
Install the pipes from the outdoor unit to the branch
joint with a downward incline. If the length of pipe between the branch joint and outdoor
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
OK NG
Outdoor Twinning Kit
CMY-Y100VBK2
P600-F
A B
C