Daikin VRV IV RXYQ TYDN Series Engineering Data page 35

Installation Manual
2
3
1 PC
2
3 Outdoor unit main printed circuit board
14. Charging refrigerant
14.1. Precautions
NOTE
pleted.
Refrigerant may only be charged after performing the leak test and
the vacuum drying.
liquid hammer.
accidents, so always ensure that the appropriate refrigerant R410A
is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging
refrigerant.
When the refrigerant system is to be opened, refrigerant must be
treated according to the applicable legislation.
DANGER
To avoid compressor breakdown. Do not charge the refrigerant
This outdoor unit is factory charged with refrigerant and depending
on pipe sizes and pipe lengths some systems require additional
charging of refrigerant. See 14.2. Calculating the additional refriger-
ant charge.
In case recharge is required, refer to the nameplate of the unit.
It states the type of refrigerant and necessary amount.
14.2. Calculating the additional refrigerant charge
NOTE
The refrigerant charge of the system must be less than 210 lbs.
(100 kg). This means that in case the calculated total refrigerant
charge is equal to or more than 209 lbs. (95 kg) you must divide your
multiple outdoor system into smaller independent systems, each
containing less than 209 lbs. (95 kg) refrigerant charge. For factory
charge, refer to the unit nameplate.
3P362438-1B English
36
1 3
4
5
X27A
A1P
14.2.1. How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged=R (lbs.). R should be rounded off
in units of 0.1 lbs.
2
R=[(X 7/8) 0.249+(X
1
0.081+(X 3/8) 0.040+(X
5
X =Total length (ft. (m)) of liquid piping size at Øa
1...6
R=[(X 22.2) 0.37+(X
1
0.12+(X 9.5) 0.059+(X
5
The amount of refrigerant by the module
Outdoor unit capacity type
RXYQ 72-120T type
RXYQ 144T type
RXYQ 168T type
Total indoor
Parameter [B] unit capacity
-
Piping length
Piping length
> 98 ft. (30 m)
Outdoor system: RXYQ264TTJU (RXYQ144TTJU + RXYQ120TTJU)
Total capacity of indoor unit: 116%
a: 3/4 × 60 ft.
b: 5/8 × 15 ft.
c: 3/8 × 15 ft.
d: 3/8 × 15 ft.
R = ( 60×0.175 + 15×0.121 + 45×0.081 + 100×0.040 + 45×0.015 ) + 8.8 + 3.31+3.31
a b
= 36.055
36.0 lbs.
Round off in units of 0.1 lbs.
INFORMATION
When using multi models, add the sum of individual capacity types.
Piping length is considered the distance from the outdoor unit to the
farthest indoor unit.
When selecting indoor unit, following table with connection ratio limita-
tion has to be respected. More detailed information can be found in
Used indoor Total capacity
units
VRV
VRV + Mini-split
Mini-split
3/4) 0.175+(X 5/8) 0.121+(X
2 3
1/4) 0.015]+[A]+[B]
6
19.1) 0.26+(X 15.9) 0.18+(X
2 3 4
6.4) 0.022]+[A]+[B]
6
Parameter [A]
The amount of refrigerant
0.0 lbs. (0.0 kg)
8.8 lbs. (4.0 kg)
9.9 lbs. (4.5 kg)
RXYQ
72T 96 - 168T
CR
> 105% 1.10 lbs. (0.5 kg)
0.66 lbs. (0.3 kg) 1.10 lbs. (0.5 kg)
1.54 lbs. (0.7 kg) 2.20 lbs. (1.0 kg)
> 105% 2.65 lbs. (1.2 kg) 3.31 lbs. (1.5 kg)
e: 3/8 × 15 ft. i: 1/2 × 20 ft. s: 1/2 × 15 ft.
f: 3/8 × 15 ft. j: 3/8 × 20 ft.
g: 1/4 × 15 ft. k: 3/8 × 20 ft.
h: 1/4 × 30 ft. r: 1/2 × 10 ft.
i, r, s c, d, e, f, j, k g, h RXYQ144TTJU 116%
Allowable capacity connection ratio
CR
VRV Mini-split
50 – 200% 50 – 200%
80 –130% 0 – 130% 0 – 130%
80 –130% – 80 – 130%
Installation of Outdoor Units
EDUS341411-N
1/2)
4
12.7)
–
26
3P362438-1B