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Air conditioner inverter / Installation manual
Pipe diameter
Tightening torque
N • m
Kgf • cm
Ø6.35mm
13.7 to 17.7
140 to 180
Ø9.52mm
34.3 to 41.2
350 to 420
Ø12.7mm
49.0 to 56.4
500 to 575
Ø15.88mm
73.5 to 78.4
750 to 800
2. Outdoor unit connection
•
Connect pipe to the pipe joint part of the stop valve in the same method as the indoor unit.
- For tightening, use the same tightening torque applied for indoor unit and tighten the flare nut
with torque wrench or spanner.
Insulation and taping
•
Cover piping joints with pipe cover.
•
For outdoor unit side, surely insulate every piping including valves.
•
Using piping tape, apply taping starting from the entry of outdoor unit.
- Fix the end of piping tape with adhesive tape.
- When piping has to be arranged through above ceiling, closet or area where temperature and
humidity are high, wind additional commercially sold insulation for prevention of condensation.
5.4
Purging procedures • leak test
1. Purging procedures
1. Connect the refrigerant pipes (both liquid pipe and gas pipe) between the indoor unit and the
outdoor unit.
2. Remove the service port cap of the stop valve on the gas pipe side of the outdoor unit. (The stop
valve will not work in its initial state fresh out of the factory [totally closed with cap on].)
3. Connect the gauge manifold valve and vacuum pump to the service port of the stop valve on the
gas pipe side of the outdoor unit
4. Run the vacuum pump. Vacuumize for more than 15 minutes.
5. Check the vacuum with the gauge manifold valve, then close the gauge manifold valve and stop
the vacuum cap.
6. Leave it as is for one or two minutes. Make sure the pointer of the gauge manifold valve remains
in the same position. Confirm that the pressure gauge shows -0.101MPa or -760mmHg.
7. Remove the gauge manifold valve quickly from the service port of the stop valve.
5
Indoor/outdoor units connection finishing and
test run
