How To Calculate The Additional Refrigerant To Be Charged - Daikin VRV II Series Design, Installation & Testing Instructions

Si39-303
7.6

How to calculate the additional refrigerant to be charged

Additional refrigerant to be charged R (Kg)
R should be rounded off in units of 0.1Kg.
Note: If a negative result is gotten for R from the formula at right, no refrigerant needs to be added.
Total length (m)
of liquid piping
R= ×0.35
size at ø22.2
Total length (m)
of liquid piping
+ ×0.054
size at ø9.5
*Example for refrigerant branch using refnet joint and refnet header for RXYQ34MY1B
Outdoor unit
a
H1
Refnet header
c
1
If the outdoor unit is
RXYQ34MY1B and the
piping lengths are as at
right
R= 30×0.25 + 10×0.17
a b
Note:
The amount of refrigerant to be added to the unit should be written on the included "Added Refrigerant"
plate and attached to the rear side of the front cover. Refer next page.
General Information
Total length (m)
of liquid piping
+
size at ø19.1
Total length (m)
of liquid piping
+
size at ø6.4
REFNET joint (A • B)
H3
i
A
b
g
d e f
2 3 4 5 6
Indoor units (1-8)
a: ø19.1 × 30m
b: ø15.9 × 10m
c: ø 9.5 × 10m
+ 10×0.11 + 40×0.054 + 40×0.022
j c+d+e+f g+h+j+k
Total length (m)
of liquid piping
+
×0.25
size at ø15.9
Model name
RXYQ5 ~ 16MY1B
-
×0.022
RXYQ18 ~ 32MY1B
RXYQ34 ~ 48MY1B
B
k
j
7 8
H2
h
d: ø 9.5 × 10m g: ø 6.4 × 10m
e: ø 9.5 × 10m h: ø 6.4 × 20m
f : ø 9.5 × 10m i : ø12.7 × 10m
- 6 = 7.358
ò
7.5
Total length (m)
of liquid piping
+
×0.17
size at ø12.7
Amount of refrigerant
0 kg
3 kg
6 kg
j : ø6.4 × 10m
k: ø6.4 × 9m
Appendix
×0.11
117