Panasonic CS-MKS7NKU Installation Manual page 12

CUTTING AND FLARING THE PIPING
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using a reamer. If burrs are not removed, gas leakage may occur.
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.
Point down
1. To cut 2. To remove burrs
10.2.4 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 gas side 3-way valve.
2. Connect the micron gauge between vacuum
pump and service port of outdoor units.
3. Turn on the power switch of the vacuum pump
and make sure to connect the digital micron
gauge and to lower to a value of 500 microns.
4. Make sure micron gauge indicates a value of
500 microns and close the low side valve of
the charging set and turn off the vacuum
pump.
5. Disconnect the vacuum pump house from the
service port of the 3-way valve.
6. Tighten the service port caps of gas side
3-way valve at a torque of 13.3 Ibf•ft (18 N•m)
with a torque wrench.
7. Remove the valve caps of both the 2-way
valve and 3-way valve. Position both of the
valves to "Open" using a hexagonal wrench
(5/32" (4 mm)).
8. Mount valve caps onto the 2-way valve and
3-way valve.
Be sure to check for gas leakage.
o
If micron gauge value does not descend 500 microns, take the following measures:
- If the leak stops when the piping connections are tightened further, continue working from step
- If the leak does not stop when the connections are retightened, repair location of leak.
- Do not release refrigerant during piping work for installation and reinstallation.
- Be careful when handling the liquid refrigerant, it may cause frostbite.
Pipe
Handle
Bar
Reamer
Clamp handle Red arrow mark
3. To flare
0 – 1 / "
32
(0-0.5 mm)
Bar
Yoke
Core
Copper pipe
Indoor Unit
Indoor Unit
Vacuum
pump
38
Improper flaring
Inclined Surface Cracked Uneven
damaged thickness
When properly flared, the internal
surface of the flare will shine evenly
and be of even thickness. Since the
flared part comes into contact with
the connections, carefully check the
flared finish.
Tube connector
Liquid side
Tube connector
Gas
side
Tube connector
Liquid side
Tube connector
Gas
side
Liquid side 3-way valve
Close
Gas side 3-way valve
Close
.
Outdoor unit