Daikin VRV III Series - Page 19

English 14
How to calculate the additional refrigerant to be charged 
Additional refrigerant to be charged : R(kg) R should be rounded off in units of 0.1 kg.
R =
Total length(m) of liquid piping size at φ22.2
Total length(m) of liquid piping size at φ15.9
Total length(m) of liquid piping size at φ9.5
Total length(m) of liquid piping size at φ19.1
Total length(m) of liquid piping size at φ12.7
Total length(m) of liquid piping size at φ6.4
0.37 kg/m
0.18 kg/m
0.059 kg/m
0.26 kg/m
0.12 kg/m
0.022 kg/m
1.02
RQCEQ280 RQCEQ360 RQCEQ460 RQCEQ500 RQCEQ540
RQCEQ636 RQCEQ712 RQCEQ744 RQCEQ816 RQCEQ848
5.2 5.8 9.1 9.4 9.7
11.2 13.8 14.3 15.1 15.6
A ≤ 100% A > 100%
0 kg
0.5 kg
Example for refrigerant branch using REFNET joint and REFNET header for the systems and each pipe length as shown below.
Correction amount by outdoor unit
Outdoor system : RQCEQ848PY1 Total capacity of indoor unit : 116%
R = ( 50 × 0.26 + 3 × 0.18 + 3 × 0.12 + 156 × 0.059 + 20 × 0.022 )×1.02 15.6 + 0.5
a : φ19.1 × 30m b : φ19.1 × 20m c : φ9.5 × 10m d : φ9.5 × 10m
e : φ9.5 × 10m f : φ9.5 × 10m g : φ9.5 × 10m h : φ9.5 × 10m
i : φ9.5 × 10m j : φ9.5 × 10m k : φ9.5 × 20m l : φ9.5 × 20m
m : φ9.5 × 20m n : φ9.5 × 10m o : φ6.4 × 10m p : φ6.4 × 10m
r : φ9.5 × 1m s : φ9.5 × 1m t : φ9.5 × 1m u : φ9.5 × 3m
v : φ15.9 × 3m w : φ12.7 × 3m
a, b v w c~n, r~u o, p
RQCEQ848PY1 112%
= 8.915 8.9 kg
Round off in units of 0.1 kg.
Note 1.
When the equivalent pipe length between outdoor unit multi connection piping and indoor units is 90m or more, the size of main pipes on the liquid side (refer to figure 9) must be increased according to the right table. (Do not increase the size of the suction gas pipe and HP/LP gas pipe.) (Refer to figure 10.2) 1.Outdoor unit 2.Main pipes 3.Increase only liquid pipe size 4.First refrigerant branch kit 5.BS unit 6.Indoor unit 
System
RQCEQ280P RQCEQ360~460P RQCEQ500~712P RQCEQ744~848P
Liquid pipe
φ9.5 → φ12.7 φ12.7 → φ15.9 φ15.9 → φ19.1 φ19.1 → φ22.2

(A: The ratio of total capacity index of connectable indoor units to outdoor capacity index (%))
01_EN_3P226891_9.fm Page 14 Tuesday, December 1, 2009 4:38 PM