Daikin VRV IV Manuel D'installation page 30

Parameter [C]
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)
Example for refrigerant branch using REFNET joint and REFNET
header for systems and each pipe length is shown below. (Example
7.5. System piping (length) limitations on page 11.)
Outdoor system: RXYQ240TAYCU (RXYQ120TAYCU+RXYQ120TAYCU)
Indoor units
FXMQ type: 18 × 1, 24 × 1, 30 × 1, 36 × 2
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. : f3/8 × 15 ft. p: f3/8 × 10 ft.
Total length of liquid piping: 285 ft.
Total capacity of indoor unit: 110.0%
[C] = 0.25×1 + 0.16×1 + 0.33×1 + 0.25×2 + 0.53×2 + 0.00×1 = 2.30 lbs.
↑ ↑ ↑
FXMQ18x1 FXMQ24x1 FXMQ30x1
[B]: The smaller of [C] or 6.61 lbs. = 2.30 lbs.
R = ( 60×0.175 + 20×0.121 + 35×0.081 + 155×0.040 + 15×0.015 ) + 19.4 + 2.30
↑ ↑ ↑
a b c, r, t d, f, g, h, i,
j, k, , m,
= 43.88 ⇒ 43.9 lbs.
Round off in units of 0.1 lbs.
INFORMATION
Piping length is considered by the distance from the outdoor unit to the
farthest indoor unit.
27
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.
↑ ↑ ↑
FXMQ36x2 FXFQ36x2 Other48x1
↑ ↑ ↑ ↑
e [A] [B]
n, o, p
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