Daikin RQYQ140-180PY1 Service Manual page 227

SiBE341001
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 1
When the equivalent pipe length between outdoor unit multi connection piping kit and indoor units is 90m or more, the size of main pipes (both gas-side and liquid-side) must be increased to the
following table.
Depending on the length of the piping, the capacity may drop, but even in such case it is able to increase the size of main pipes.
(Refer to figure below)
1. Outdoor unit
2. Main pipes
3. Increase
4. The first refrigerant branch kit
5. Indoor unit
4
1
5
2
3
Appendix
  
Total length (m) Total length (m)
  
R= of liquid piping + of liquid piping
×0.26
  
size at φ19.1 size at φ15.9
kg/m
 

Total length (m) Total length (m)
 

+ +
of liquid piping
×0.059 of liquid piping
 

size at φ9.5
size at φ6.4
kg/m
Example for refrigerant branch using REFNET joint and REFNET header
a: φ15.9 × 30m
In case the outdoor unit is
RQCYQ540PY1 type and the
b: φ15.9 ×10m
piping lengths are as at right
c: φ9.5 × 20m
Total capacity of indoor unit: 116%
R= ( 40×0.18 + 3×0.12 + 1.33×0.059 + 20×0.022 ) 11.2 + 0.5 = 5.147
a, b u c~i, r~t j, k
Piping size (O.D.)
Model name of
outdoor unit system
Gas pipe
φ15.9 φ19.1
RQYQ140
φ19.1 φ22.2
RQYQ180
φ22.2 φ25.4
RQCYQ280
φ25.4 φ28.6
RQCYQ360
RQCYQ460
φ28.6 φ34.9
RQCYQ500, 540
  
Total length (m)
  
+ of liquid piping
×0.18 ×0.12
  
size at φ12.7
kg/m kg/m
RQYQ140 2.4 kg RQCYQ460

RQYQ180 2.4 kg RQCYQ500

×0.022
RQCYQ280 6.8 kg RQCYQ540

kg/m
RQCYQ360 6.8 kg
d: φ9.5 × 20m g: φ9.5 × 20m
e: φ9.5 × 20m h: φ9.5 × 20m
f : φ9.5 × 20m i : φ9.5 × 10m
5.1 kg
RQCYQ540PY1 116%
Liquid pipe
φ9.5
Not increased
φ9.5
Not increased
φ9.5 φ12.7
φ12.7 φ15.9
φ15.9 φ19.1
Example of connection (R-410A Type)
A ≤100%
11.2 kg 0 kg
11.2 kg A > 100% 0.5 kg
11.2 kg
(A: The ratio of total
capacity index of
connectable indoor
units to outdoor
capacity index (%))
j : φ6.4 × 10m s: φ9.5 × 1m
k: φ6.4 × 10m t : φ9.5 × 1m
r : φ9.5 × 1m u: φ12.7 × 3m
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