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• Airtight
Pressurize the high-pressure section of the system (liquid piping)
to 3.8 MPa (38 bar) and the low-pressure section of the system
(gas piping) to the design pressure (*1) of the indoor unit (field
supply) from the service port (*2) (do not exceed the design
pressure). The system is considered to have passed if there is no
decrease in the pressure over a period of 24 hours.
If there is a decrease in the pressure, check for and repair leaks.
• Refrigerant oil charging
If the target evaporating temperature is –20°C or lower, adding
refrigerant oil may be required. For instructions on how to calculate
the additional amount of refrigerant oil, refer to the backside of the
electric component box cover, or the table below.
If it is not necessary to add refrigerant oil, proceed with vacuum
drying the system. For instructions on how to vacuum dry the
system, proceed to the next item.
How to calculate the additional amount of refrigerant oil
Enter the blanks in the table below:
Target evaporating temperature (TEM)
Fixed amount
Blower
Total internal volume
Indoor
unit
coil
Show
Total capacity
case
Sum
Gas
Size
Piping
piping
(mm)
length (m)
Ø12.7
Ø15.9
Ø19.1
Ø22.2
Ø25.4
Ø28.6
Ø31.8
Ø34.9
Ø38.1
Ø41.3
Sum (C+D+E+F+G+H+I+J+K+L)
a.See table 1.
b.See table 2.
c.See table 3.
d.See table 4.
e.If piping length is between 0 m and 10 m, the constant value =0 l.
• Please select the volume factor of the target evaporating
temperature from the table above.
The total amount of required oil
(++)
The amount of additional oil
() –19.8 l
a
The amount of additional oil
a.If the calculated amount of additional oil is 0 l, do not add refrigerant oil.
Table 1: Volume factor of the blower coil
Target evaporating temperature (TEM)
–20°C
–25°C
–30°C
–35°C
–40°C
–45°C
Table 2: Volume factor of the showcase
Target evaporating temperature (TEM)
–20°C
–25°C
–30°C
–35°C
–40°C
–45°C
Installation manual
17
Volume factor
Subtotal (l)
(l/l)
l ×
=
a
Volume factor
Subtotal (l)
(l/kW)
kW ×
=
b
(A+B) =
Volume factor
de
Subtotal (l)
Constant (l)
c
(l/m)
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
×
+
=
=
=
=
Factor
0.033
0.045
0.063
0.090
0.128
0.141
Factor
0.203
0.225
0.255
0.286
0.321
0.353
Table 3: Volume factor of the gas piping
Size (mm)
–45°C
Ø12.7
0.022
Ø15.9
0.028
Ø19.1
0.038
Ø22.2
0.050
Ø25.4
0.063
Ø28.6
0.078
Ø31.8
0.094
Ø34.9
0.110
Ø38.1
0.129
Ø41.3
0.149
Table 4: Constant of the gas piping
Size (mm)
–45°C
Ø12.7
0.6
Ø15.9
0.6
°C
Ø19.1
0.6
11.5 l
Ø22.2
0.6
Ø25.4
0.7
Ø28.6
0.8
(A)
Ø31.8
0.9
Ø34.9
1.2
Ø38.1
1.4
(B)
Ø41.3
1.8
l
CAUTION
• Only use the refrigerant oil listed in the Daikin service parts list
(C)
(1 l can; Parts No.: 5004333)
(D)
• Not using the refrigerant oil listed in the Daikin service parts list
(E)
may lead to compressor failure.
(F)
• Do not expose the refrigerant oil to air for more than 10 minutes.
(G)
Failure to follow this instruction may cause moisture to dissolve
into the oil.
(H)
• Dispose of the leftover refrigerant oil as waste.
(I)
(J)
• Vacuum drying
(K)
Operate the vacuum pump for more than three hours from the
(L)
service port of both the liquid pipe and the gas pipe (*2) to evacuate
l
to –100.7 kPa or less. After that, (1) pressurize the outdoor unit
with nitrogen gas to 0.2 MPa or more, and after leaving the outdoor
unit for 10 minutes, (2) operate the vacuum pump for more than
one hour to evacuate to –100.7 kPa or less. (Repeat the steps (1)
and (2) three or more times.)
After the operations are completed, leave the outdoor unit for one
hour and then check that the reading on the vacuum gauge is not
rising. (If the reading on the vacuum gauge is rising, water may be
l
remaining in the system or leakage may be occurring. In that case,
perform necessary repair and then conduct the air-tightness test
l
again.)
*1The design pressure of the indoor unit (locally procured) needs to be
l
2.5 MPa or more. Contact the manufacturer in advance for
information on the design pressure.
*2 Refer to the instruction label on the front panel of the outdoor unit
(below) for the position of the service port.
Target evaporating temperature (TEM)
–40°C
–35°C
–30°C
0.020
0.019
0.016
0.025
0.022
0.019
0.035
0.029
0.025
0.045
0.038
0.033
0.057
0.049
0.041
0.071
0.060
0.051
0.086
0.073
0.061
0.101
0.086
0.073
0.118
0.098
0.085
0.137
0.116
0.096
Target evaporating temperature (TEM)
–40°C
–35°C
–30°C
0.5
0.4
0.3
0.5
0.4
0.3
0.5
0.4
0.3
0.5
0.4
0.3
0.6
0.4
0.3
0.7
0.6
0.3
0.8
0.6
0.4
1.0
0.8
0.5
1.2
1.1
0.6
1.6
1.2
0.9
Position of instruction label
Label
Air cooled refrigeration condensing unit
–25°C
–20°C
0.014
0.011
0.016
0.014
0.021
0.017
0.027
0.022
0.035
0.028
0.043
0.035
0.051
0.042
0.061
0.050
0.071
0.058
0.082
0.068
–25°C
–20°C
0.2
0.1
0.2
0.1
0.2
0.1
0.2
0.1
0.2
0.1
0.2
0.1
0.3
0.2
0.3
0.2
0.4
0.2
0.5
0.3
LREQ15+20B7Y1R
4P360438-1B – 2014.01
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