26
3P362438-1B English
X27A
1
2
3
2
3
4
5
H
J
S
T
X27A
A1P
1 PC
2
Cable (EKPCCAB*)
3 Outdoor unit main printed circuit board
14 . Charging refrigerant
14 .1 . Precautions
NOTE
• Refrigerant cannot be charged until field wiring has been com
-
pleted.
•
Refrigerant may only be charged after performing the leak test and
the vacuum drying.
• When charging a system, care shall be taken that its maximum
permissible charge is never exceeded, in view of the danger of
liquid hammer.
• Charging with an unsuitable substance may cause explosions and
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
See Safety considerations on page i.
•
To avoid compressor breakdown. Do not charge the refrigerant
more than the specified amount.
•
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.
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.
R=[(X
1
×
f
7/8)
×
0.249+(X
2
×
f
3/4)
×
0.175+(X
3
×
f
5/8)
×
0.121+(X
4
×
f
1/2)
×
0.081+(X
5
×
f
3/8)
×
0.040+(X
6
×
f
1/4)
×
0.015]+[A]+[B]
X
1...6
=Total length (ft. (m)) of liquid piping size at Øa
* In units of 0.1 kg, additional refrigerant to be charged=R (kg).
R=[(X
1
×
f
22.2)
×
0.37+(X
2
×
f
19.1)
×
0.26+(X
3
×
f
15.9)
×
0.18+(X
4
×
f
12.7)
×
0.12+(X
5
×
f
9.5)
×
0.059+(X
6
×
f
6.4)
×
0.022]+[A]+[B]
Parameter [A]
The amount of refrigerant by the module
Outdoor unit capacity type
The amount of refrigerant
RXYQ 72-120T type
0.0 lbs. (0.0 kg)
RXYQ 144T type
8.8 lbs. (4.0 kg)
RXYQ 168T type
9.9 lbs. (4.5 kg)
Parameter [B]
Total indoor
unit capacity
CR
(a)
RXYQ
72T
96 - 168T
Piping length
≤ 98 ft. (30 m)
> 105%
1.10 lbs. (0.5 kg)
Piping length
> 98 ft. (30 m)
70%<CR≤85%
0.66 lbs. (0.3 kg) 1.10 lbs. (0.5 kg)
85%<CR≤105%
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)
Example for refrigerant branch using REFNET joint and REFNET
header for systems and each pipe length as shown below. (Example
2.2, 7.5.2. System only containing VRV indoor units on page 12)
Outdoor system: RXYQ264TTJU (RXYQ1 RXYQ120TTJU)
Total capacity of indoor unit: 116%
a:
f
3/4 × 60 ft.
e:
f
3/8 × 15 ft.
i:
f
1/2 × 20 ft.
s:
f
1/2 × 15 ft.
b:
f
5/8 × 15 ft.
f:
f
3/8 × 15 ft.
j:
f
3/8 × 20 ft.
c:
f
3/8 × 15 ft.
g:
f
1/4 × 15 ft.
k:
f
3/8 × 20 ft.
d:
f
3/8 × 15 ft.
h:
f
1/4 × 30 ft.
r:
f
1/2 × 10 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
↑
i, r, s
↑
c, d, e, f, j, k
↑
g, h
↑
RXYQ144TTJU
↑
116%
= 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
Engineering Data Book.
Used indoor
units
Total capacity
CR
(a)
Allowable capacity connection ratio
VRV
Mini-split
VRV
50 – 200%
50 – 200%
–
VRV + Mini-split
80 –130%
0 – 130%
0 – 130%
Mini-split
80 –130%
–
80 – 130%
