System Evacuation And Charging - Daikin RR20AVAK9 Installation & Service Reference

• Over-tightening can damage the terminal screws.
• Do not connect wires of different gauge to same terminal.
• Keep wiring in an orderly manner. Prevent the wiring from obstructing other parts and the terminal box cover.
Connect wires of the
same gauge to both side.
Special Precautions When Using R-410A Unit
R-410A is an HFC refrigerant that does not damage the ozone
layer. The working pressure of this refrigerant is 1.6 times higher
than conventional refrigerant (R-22). Proper installation and ser-
vicing of R-410A units is essential.
• Never use refrigerant other than R-410A in an air condi-
tioner which is designed to operate with R-410A.
• POE or PVE oil is used as lubricant in R-410A compressors.
These oils are different form the mineral oil used in R-22
compressors. During installation or servicing, extra pre-
caution must be taken not to expose the R-410A system
too long to moist air. Residual POE or PVE oil in the piping
and components can absorb moisture from the air.
• To prevent mischarging, the diameter of the service port
on the Flare valve is different from that of R-22.
• Use tools and material exclusively for refrigerant R-410A.
These tools include manifold valve, charging hose, pres-
sure gauge, gas leak detector, flare tools, torque wrench,
vacuum pump and refrigerant cylinder.
• As an R-410A air conditioner incurs higher pressure than
R-22 units, it is essential to choose the copper pipes cor-
rectly. Never use copper pipes thinner than 0.8mm even
though they are available on the market.
• If refrigerant gas leakage occurs during installation or ser-
vicing, be sure to ventilate fully. If the refrigerant gas comes
in contact with fire, a poisonous gas may occur.
• When installing or removing an air conditioner, do not al-
low air or moisture to remain in the refrigerant cycle.

System Evacuation and Charging

Evacuating (vacuuming) the system is necessary to eliminate all moisture and air from the unit.
Evacuating (Vacuuming) The Piping and The Indoor Unit
The indoor unit and the refrigerant connecting pipes must be air-purged because the air containing moisture that remains in the
refrigerant cycle may cause a malfunction of the compressor.
1. Remove the caps from the valve and the service port.
2. Connect the center of the charging gauge to the vacuum pump.
Do not connect wires of the
same gauge to one side.
Figure 16
To avoid possible explosion:
• Never apply flame or steam to a refrigerant cylinder. If you
must heat a cylinder for faster charging, partially immerse
it in warm water.
• Never fill a cylinder more than 80% full of liquid refrigerant.
• Never add anything other than R-22 to an R-22 cylinder or
R-410A to an R-410A cylinder. The service equipment used
must be listed or certified for the type of refrigerant used.
• Store cylinders in a cool, dry place. Never use a cylinder
as a platform or a roller.
The compressor POE oil for R-410A units is extremely susceptible
to moisture absorption and could cause compressor failure. Do
not leave system open to atmosphere any longer than necessary
for installation.
21
Do not connect wires
of different gauges.
CAUTION