# Daikin RXYQ5PY1 Service Manual: How To Calculate The Additional Refrigerant To Be Charged

Daikin r-410a heat pump 50hz/60hz cooling only 50hz.

SiEN34-705
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.
Total length (m)
of liquid piping
R=
×0.37
size at ø22.2
Total length (m)
of liquid piping
+
×0.059
size at ø9.5
*Example for refrigerant branch using refnet joint and refnet header for RX(Y)Q34P
Outdoor unit
a
H1
c
1
If the outdoor unit is
RX(Y)Q34 type and the
piping lengths are as at
right
R=
30×0.26
+
10×0.18
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 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: φ19.1 × 30m
b: φ15.9 × 10m
c: φ 9.5 × 10m
+
10×0.12
+
40×0.059
+
49×0.022
j
c+d+e+f
g+h+j+k
145
)
Total length (m)
of liquid piping
+
×0.26
size at ø15.9
×0.022
B
k
j
7
8
H2
h
d: φ 9.5 × 10m
g: φ 6.4 × 10m
e: φ 9.5 × 10m
h: φ 6.4 × 20m
f : φ 9.5 × 10m
i : φ12.7 × 10m
= 14.238
14.2
Total length (m)
of liquid piping
+
×0.18
size at ø12.7
j : φ6.4 × 10m
k: φ6.4 × 9m
Appendix
×0.12
141