En-39
<Calculation>
When there are 3 outdoor units (AJ
•
144LALH, AJ 126LALH, AJ 108LALH) connected to 1 system
Calculation of additional amount for outdoor unit
(1)
A=3.30(kg)+3.30(kg)+1.20(kg)=7.80(kg)
Calculation of additional amount for pipe length
(2)
If liquid pipe piping length is the following
ф
19.05 : 50m,
ф
15.88 : 25m,
ф
12.70 : 0m,
ф
9.53 : 20m,
ф
6.53 : 15m
Additional charge volume B=50(m)×0.268(kg/m)+25(m)×0.178(kg/m)+0(m)×0.114(kg/m)
+20(m)×0.058(kg/m)+15(m)×0.021(kg/m)
=19.325kg
Calculation of additional charge refrigerant
(3)
C=A+B =7.80(kg)+19.33(kg)=27.13(kg)
Calculation of factory charged amount
(4)
D=11.8(kg)+11.8(kg)+11.8(kg)=35.4 (kg)
Check the total amount of refrigerant
(5)
When 3 outdoor units are connected to 1 system, the following condition must be satis
fi
ed.
Condition: E=C+D<
=94.5(kg)
Calculation: 27.13(kg)+35.4(kg)=62.53(kg)<94.5(kg)
→
No problem if the above condition is satis
fi
ed.
Installing insulation
8. 4.
Install insulation material after conducting the “8.1 Sealing Test”.
•
To prevent condensation and water droplets, install insulation
•
material on the refrigerant pipe.
Refer to the table to determine the thickness of the insulation
•
material.
If the outdoor unit is installed at a level that is higher than the in-
•
door unit, the water that has condensed in the 3-way valve of the
outdoor unit could travel to the indoor unit.
Therefore, use putty in the space between the pipe and the insu-
lation to prevent the entry of water.
Selection of insulation
Table.
(for using an insulation material with equal heat transmission rate or below 0.040W/(m·k))
Insulation material
Minimum thickness (mm)
Relative humidity
<
= 70%
<
= 75%
<
= 80%
<
= 85%
Pipe diameter
(mm)
6.35
8
10
13
17
9.52
9
11
14
18
12.70
10
12
15
19
15.88
10
12
16
20
19.05
10
13
16
21
22.22
11
13
17
22
28.58
11
14
18
23
34.92
11
14
18
24
41.27
12
15
19
25
When an ambient temperature and relative humidity exceed 32 °C, please strengthen heat insulation of refrigerant pipe.
*
Putty
Insulation
9378945029-03_IM_EN.indb 39
9378945029-03_IM_EN.indb 39
2011-9-20 16:26:04
2011-9-20 16:26:04
