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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
1
2
× 0.081+(X
× f3/8) × 0.040+(X
× f1/4) ×
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).
× f22.2) × 0.37+(X
× f19.1) × 0.26+(X
1
2
× f9.5) × 0.059+(X
× f6.4) ×
0.12+(X
5
6
Parameter [A]
Refrigerant amount for Branch Selector units
Branch Selector unit model
Parameter [B]
Refrigerant amount for outdoor units
Outdoor unit capacity type
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
< 295.3 ft.
r o
(90 m)
>
or 5.51 lbs. (2.5 kg)
(90 m)
>
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
r o
r o
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
or r ri
r
r
c
r or
c
i
7.5. System piping (length) limitations on page 11.)
*
O
oor
Branch Selector units
Indoor units
O
r
Liquid piping
a: f
e: f1/4 15 ft.
i: f3/8 20 ft. m: f3/8 15 ft. r: f1/2 10 ft.
b: f
f: f3/8 10 ft.
j: f3/8 10 ft. n: f3/8 15 ft.
c: f
g: f3/8 10 ft. k: f3/8 10 ft. o: f3/8 10 ft.
d: f
h: f3/8 15 ft.
f3/8 15 ft. p: f3/8 10 ft.
Total length of liquid piping: 285 ft.
o
c
ci o i
oor
i
=
+
+
+
↑
↑
↑
r o
or
R = (
+
+
+
↑
↑
↑
a
b
c, r, t
d, f, g, h, i,
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)
i
oi
o
o
*
*)
t: f1/2 15 ft.
+
+
= 1.88 lbs.
↑
↑
↑
O
r
+
) 1.04 + 1.3 + 13.9 + 1.88
↑
↑
↑
↑
e
3P362438-5N English
↑
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