32
1. To cut
Bar
0 - 0.5 mm
Copper pipe
Handle
Bar
Yoke
Core
Red arrow mark
Clamp handle
3. To flare
Pipe
Reamer
Point down
2. To remove burrs
Improper flaring
Uneven
thickness
Inclined
Surface
damaged
Cracked
When properly flared, the internal surface
of the flare will evenly shine and be of
even thickness. Since the flare part
comes into contact with the connections,
carefully check the flare finish.
Lo
OPEN
Vacuum pump adaptor
Vacuum
pump
GAS SIDE
Liquid side
Indoor unit
GAS SIDE
Liquid side
Indoor unit
Hi
CLOSE
THREE-WAY VALVE
THREE-WAY VALVE
THREE-WAY VALVE
THREE-WAY VALVE
Outdoor unit
12.3.2.2 Connecting the piping to outdoor unit
Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the
flare nut (locate at valve) onto the copper pipe. Align center of piping to valves and then tighten with torque wrench
to the specified torque as stated in the table.
12.3.2.3 Cutting and flaring the piping
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs are not removed, gas leakage may be caused. Turn the piping
end down to avoid the metal powder entering the pipe.
3. Please make flare after inserting the flare nut onto the copper pipes.
12.3.3 Evacuation of the Equipment
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT
AND PIPES in the following procedure.
1. Connect a charging hose with a push pin to
the Low side of a charging set and the
service port of the 3-way valve.
o Be sure to connect the end of the
charging hose with the push pin to the
service port.
2. Connect the center hose of the charging
hose of the charging set to a vacuum pump.
3. Turn on the power witch of the vacuum pump
and make sure that the needle in the gauge
moves from 0cmHg (0MPa) to -76cmHg (-
0.1MPa). Then evacuate the air
approximately ten minutes.
4. Close the Low side valve of the charging set
and turn off the vacuum pump. Make sure
that the needle in the gauge does not move
after approximately five minutes.
Note: BE SURE TO FOLLOW THIS
PROCEDURE IN ORDER TO AVOID
REFRIGERANT GAS LEAKAGE.
5. Disconnect the charging hose from the
vacuum pump and from the service port of
the 3-way valve.
6. Tighten the service port caps of the 3-way
valve at torque of 18N.m. with a torque
wrench.
7. Remove the valve caps of both of the 2-way
valve and 3-way valve. Position both of the
valves to “OPEN” using a hexagonal wrench
(4mm).
8. Mount valve caps onto the 2-way valve and
the 3-way valve.
o Be sure to check for gas leakage.
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