Calculating The Additional Refrigerant Charge - Daikin VRV IV REYQ72TATJ Series Installation Manual

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.
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.
× f7/8) × 0.249+(X × f3/4) × 0.175+(X
R=[(X
1 2
× 0.081+(X × f3/8) × 0.040+(X × f1/4) × 0.015] × 1.04+[A]+[B]+[C]+[E]
5 6
=Total length (ft. (m)) of liquid piping size at fa
X
1...6
* In units of 0.1 kg, additional refrigerant to be charged=R (kg).
R=[(X × f22.2) × 0.37+(X × f19.1) × 0.26+(X
1 2
× f9.5) × 0.059+(X × f6.4) × 0.022] × 1.04+[A]+[B]+[C]+[E]
0.12+(X
5 6
Parameter [A]
Refrigerant amount for Branch Selector units
Branch Selector unit model
BS4Q54T
BS6Q54T
BS8Q54T
BS10Q54T
BS12Q54T
BSQ36T
BSQ60T
BSQ96T
Parameter [B]
Refrigerant amount for outdoor units
Outdoor unit capacity type
REYQ72T
REYQ96T
REYQ120T
REYQ144T
REYQ168T
Parameter [C]
Refrigerant amount by field piping length
and indoor units capacity
Total
Field indoor unit
Total outdoor unit capacity type
piping capacity
REYQ72-
length connection
144T
ratio
≤ 85%
< 295.3 ft.
The smaller of [D]
(90 m)
> 85%
or 5.51 lbs. (2.5 kg)
≤ 85%
≥ 295.3 ft.
(90 m)
> 85%
27
× f5/8) × 0.121+(X × f1/2)
3 4
× f15.9) × 0.18+(X × f12.7) ×
3 4
Refrigerant amount
0.7 lbs./unit (0.3 kg/unit)
0.9 lbs./unit (0.4 kg/unit)
1.1 lbs./unit (0.5 kg/unit)
1.5 lbs./unit (0.7 kg/unit)
1.8 lbs./unit (0.8 kg/unit)
0.1 lbs./unit (0.05 kg/unit)
0.2 lbs./unit (0.1 kg/unit)
0.4 lbs./unit (0.2 kg/unit)
Refrigerant amount
0.0 lbs./unit (0.0 kg/unit)
3.1 lbs./unit (1.4 kg/unit)
3.3 lbs./unit (1.5 kg/unit)
10.6 lbs./unit (4.8 kg/unit)
10.8 lbs./unit (4.9 kg/unit)
Refrigerant amount
REYQ168- REYQ312-
288T 456T
0.0
The smaller of [D] The smaller of [D]
or 6.61 lbs. (3.0 kg) or 7.50 lbs. (3.4 kg)
0.0
2.20 lbs. (1.0 kg)
Parameter [D]
Indoor unit
capacity
07 09 12 15
type
Refrigerant
0.06 0.03 0.14 0.29
amount
(0.03) (0.014) (0.06) (0.13)
(lbs. (kg)/unit)
Indoor unit FXFQ type
capacity
07 09 12 15
type
Refrigerant
0.36 0.33 0.30 0.26
amount
(0.16) (0.15) (0.14) (0.12)
(lbs. (kg)/unit)
Parameter [E]
Refrigerant amount for DOAS
Refer to DOAS Installation Manual for additional refrigerant amounts
for DOAS connections
Example for refrigerant branch using REFNET joint and REFNET
header for systems and each pipe length as shown below. (Example
7.5. System piping (length) limitations on page 11.)
Outdoor system: REYQ264TATJ* (REYQ144TATJ*+REYQ120TATJ*)
Branch Selector units
BS4Q54T × 1, BSQ60T × 1, BSQ96T × 1
Indoor units
FXMQ type: 18 × 1, 24 × 2 , 36 × 1 , 54 × 1
FXFQ type: 36 × 2
Other: 48 × 1
Liquid piping
a: f3/4 × 60 ft. e: f1/4 × 15 ft. i: f3/8 × 20 ft. m: f3/8 × 15 ft. r: f1/2 × 10 ft.
b: f5/8 × 20 ft. f: f3/8 × 10 ft. j: f3/8 × 10 ft. n: f3/8 × 15 ft.
c: f1/2 × 10 ft. g: f3/8 × 10 ft. k: f3/8 × 10 ft. o: f3/8 × 10 ft.
d: f3/8 × 15 ft. h: f3/8 × 15 ft. ℓ: f3/8 × 15 ft. p: f3/8 × 10 ft.
Total length of liquid piping: 285 ft.
Total capacity of indoor unit: 104.5%
[D] = 0.25×1 + 0.16×2 + 0.25×1 + 0.00×1 + 0.53×2 + 0.00×1 = 1.88 lbs.
↑ ↑ ↑
FXMQ18x1 FXMQ24x2 FXMQ36x1
[C]: The smaller of [D] or 6.61 lbs. = 1.88 lbs.
R = ( 60×0.175 + 20×0.121 + 35×0.081 + 155×0.040 + 15×0.015 ) × 1.04 + 1.3 + 13.9 + 1.88
↑ ↑ ↑
a b c, r, t d, f, g, h, i,
j, k, ℓ, m,
n, o, p
= 40.1472 ⇒ 40.1 lbs.
Round off in units of 0.1 lbs.
INFORMATION
Piping length is considered the distance from the outdoor unit to the
farthest indoor unit.
FXMQ type
18 24 30 36 48 54
0.25 0.16 0.33 0.25 0.08 0.00
(0.11) (0.07) (0.15) (0.11) (0.04) (0.00)
Others
18 24 30 36 48
0.61 0.53 0.61 0.53 0.36 0.00
(0.28) (0.24) (0.28) (0.24) (0.16) (0.00)
t: f1/2 × 15 ft.
↑ ↑ ↑
FXMQ54x1 FXFQ36x2 Other48x1
↑ ↑ ↑ ↑
e [A] [B] [C]
3P362438-5N English
↑