Panasonic CS-C28GKF, Service Manual

Page: 23 / 58

23
Connect 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 (located
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.
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 is 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.
11.2.3. AIR PURGING OF THE PIPINGS AND INDOOR UNIT
1) Checking a gas leakage
1. Remove the service-port cap from both 3-way valves.
2. Connect the Manifold gauge set to the service port of
Liquid side 3-way valve.
3. Connect the Charging Cylinder to the Manifold gauge set
and open the valve of the Cylinder.
4. Open the low pressure side valve of the Manifold gauge
for approx. 10 seconds and then close.
5. Check gas-leakage of the connecting portion of pipings
with the gas-leak detector.
<For the left pipings>
1) Measure the pressure.
2) Keep it for 5-10 minutes
•
Ensure if the pressure indicated on the gauge is as same as that of measured at first time.
2) Air purging
The air remaining in the Refrigeration cycle which contains
moisture may cause malfunction on the Compressor.
1. To purge the air, push the pin on the Gas side 3-way
valve for three seconds with a Hexagonal wrench and set
it free for one minute.
• Repeat this for three times.
2. To balance the refrigerant, close the low pressure side
valve on the Manifold gauge and release refrigerant from
the piping through service port until the gauge indicates
0.5 - 0.3 MPa.
3. Set both 3-way valves to open position with the
Hexagonal wrench for the unit operation.