Daikin LREQ15B7Y1R, Installation Manual

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Installation manual
17
20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
• 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:
• Please select the volume factor of the target evaporating
temperature from the table above.
Table 1: Volume factor of the blower coil
Table 2: Volume factor of the showcase
Table 3: Volume factor of the gas piping
Table 4: Constant of the gas piping
CAUTION
• Only use the refrigerant oil listed in the Daikin service parts list
(1 l can; Parts No.: 5004333)
• Not using the refrigerant oil listed in the Daikin service parts list
may lead to compressor failure.
• Do not expose the refrigerant oil to air for more than 10 minutes.
Failure to follow this instruction may cause moisture to dissolve
into the oil.
• Dispose of the leftover refrigerant oil as waste.
• Vacuum drying
Operate the vacuum pump for more than three hours from the
service port of both the liquid pipe and the gas pipe (*2) to evacuate
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
remaining in the system or leakage may be occurring. In that case,
perform necessary repair and then conduct the air-tightness test
again.)
*1The design pressure of the indoor unit (locally procured) needs to be
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) °C
 Fixed amount 11.5 l

Indoor
unit
Blower
coil Total internal volume Volume factor
(l/l) Subtotal (l)
l × a
a.See table 1.
= ( A )
Show
case Total capacity Volume factor
(l/kW) Subtotal (l)
kW × b
b.See table 2.
= ( B )
Sum ( A + B ) = l
 Gas
piping
Size
(mm) Piping
length (m) Volume factor
(l/m)
c
c.See table 3.
Constant (l)
de
d.See table 4.
e.If piping length is between 0 m and 10 m, the constant value =0 l.
Subtotal (l)
Ø12.7 × + = ( C )
Ø15.9 × + = ( D )
Ø19.1 × + = ( E )
Ø22.2 × + = ( F )
Ø25.4 × + = ( G )
Ø28.6 × + = ( H )
Ø31.8 × + = ( I )
Ø34.9 × + = ( J )
Ø38.1 × + = ( K )
Ø41.3 × + = ( L )
Sum ( C + D + E + F + G + H + I + J + K + L ) = l

The total amount of required oil
(

+

+

)
= l
The amount of additional oil
(

) –19.8 l
= l
The amount of additional oil
a
a.If the calculated amount of additional oil is 0 l, do not add refrigerant oil.
l
Target evaporating temperature (TEM) Factor
–20°C 0.033
–25°C 0.045
–30°C 0.063
–35°C 0.090
–40°C 0.128
–45°C 0.141
Target evaporating temperature (TEM) Factor
–20°C 0.203
–25°C 0.225
–30°C
0.255
–35°C 0.286
–40°C 0.321
–45°C 0.353
Size (mm) Target evaporating temperature (TEM)
–45°C –40°C –35°C –30°C –25°C –20°C
Ø12.7 0.022 0.020 0.019 0.016 0.014 0.011
Ø15.9 0.028 0.025 0.022 0.019 0.016 0.014
Ø19.1 0.038 0.035 0.029 0.025 0.021 0.017
Ø22.2 0.050 0.045 0.038 0.033 0.027 0.022
Ø25.4 0.063 0.057 0.049 0.041 0.035 0.028
Ø28.6 0.078 0.071 0.060 0.051 0.043 0.035
Ø31.8 0.094 0.086 0.073 0.061 0.051 0.042
Ø34.9 0.110 0.101 0.086 0.073 0.061 0.050
Ø38.1 0.129 0.118 0.098 0.085 0.071 0.058
Ø41.3 0.149 0.137 0.116 0.096 0.082 0.068
Size (mm) Target evaporating temperature (TEM)
–45°C –40°C –35°C –30°C –25°C –20°C
Ø12.7 0.6 0.5 0.4 0.3 0.2 0.1
Ø15.9 0.6 0.5 0.4 0.3 0.2 0.1
Ø19.1 0.6 0.5 0.4 0.3 0.2 0.1
Ø22.2 0.6 0.5 0.4 0.3 0.2 0.1
Ø25.4 0.7 0.6 0.4 0.3 0.2 0.1
Ø28.6 0.8 0.7 0.6 0.3 0.2 0.1
Ø31.8 0.9 0.8 0.6 0.4 0.3 0.2
Ø34.9 1.2 1.0 0.8 0.5 0.3 0.2
Ø38.1 1.4 1.2 1.1 0.6 0.4 0.2
Ø41.3 1.8 1.6 1.2 0.9 0.5 0.3
Position of instruction label
Label