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12 Reconnect the common hose to the vacuum pump.
Repeat steps 6 through 11, alternating between
breaking the vacuum with dry nitrogen and
evacuating, until system evacuation has occurred
three times, to the following vacuum levels:
Evacution
First
Second
Third
13 After evacuating to at least 500 microns for the third
time, close the gauge manifold valve and wait 60
minutes, making sure that the vacuum level in the
system does not decrease. If it does, a small leak
is likely. Repair the leak and repeat the evacuation
process.
Outdoor Unit
The designs and shape are subject to change according to the model.
Step 9 Adjusting refrigerant (R-410A)
The outdoor unit comes with an optimized amount of
refrigerant for the outdoor unit combined with an indoor
unit registered in AHRI.
If the outdoor unit has been retrofitted to third-party air
Microns
handler, be sure to adjust the amount of refrigerant to the
4000
amount calculated by using the internal coil volume of
2000
the indoor unit and the length of the installed piping.
500
If the internal coil volume of the indoor unit cannot be
determined, calculate the total refrigerant amount by
using following tables.
The calculated total refrigerant amount cannot exceed
the maximum refrigerant amount shown on page18.
• Charging an excessive amount of refrigerant may damage
the compressor. If the outdoor unit has been retrofitted,
be sure to adjust the amount of refrigerant by taking into
account the internal volume of the heat exchanger.
1 Check if the stop valve is closed completely.
2 Charge the refrigerant through the service port of the
liquid stop valve.
NOTE
• Do not charge the refrigerant through the service port
of the gas stop valve.
3 If you have any difficulty charging the refrigerant as
described in the steps above, take the following steps:
Vacuum
Pump
a Open the liquid stop valve and gas stop valve.
b Operate the air conditioner by pressing the K2
c After the system has stabilized, charge the
A (Low
pressure)
B (High
pressure)
Indoor Unit
CAUTION
button once on the outdoor unit PCB.
refrigerant through the service port of the liquid
service valve.
Liquid side stop valve(service port)
Gas side stop valve(service port)
Outdoor Unit
R-410A
17
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