SiEN34-705
Appendix
General Information
141
7.6 How to Calculate the Additional Refrigerant to be
Charged
7.6.1 Heat Pump 50Hz/60Hz, Cooling Only 50Hz (RX(Y)Q5~54P, 50PH)
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 below, no refrigerant needs to be added.
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 page
145
)
*Example for refrigerant branch using refnet joint and refnet header for RX(Y)Q34P
R=
+
+
+
+
×0.37
Total length (m)
of liquid piping
size at ø22.2
×0.26
Total length (m)
of liquid piping
size at ø19.1
×0.18
Total length (m)
of liquid piping
size at ø15.9
×0.12
Total length (m)
of liquid piping
size at ø12.7
+
×0.059
Total length (m)
of liquid piping
size at ø9.5
×0.022
Total length (m)
of liquid piping
size at ø6.4
H1
H2
a
i
b
Outdoor unit
c
d
e
f
g
h
1
2
3
4
5
6
Indoor units (1-8)
Refnet header
k
j
7
8
H3
REFNET joint (A • B)
A
B
If the outdoor unit is
RX(Y)Q34 type and the
piping lengths are as at
right
R=
a
b
j
c+d+e+f
g+h+j+k
+
30×0.26
a:
φ
19.1 × 30m
b:
φ
15.9 × 10m
c:
φ
9.5 × 10m
d:
φ
9.5 × 10m
e:
φ
9.5 × 10m
f :
φ
9.5 × 10m
g:
φ
6.4 × 10m
h:
φ
6.4 × 20m
i :
φ
12.7 × 10m
j :
φ
6.4 × 10m
k:
φ
6.4 × 9m
+
10×0.18
+
10×0.12
+
40×0.059
= 14.238
49×0.022
14.2
