Kitano KC-Montaro II-60 [47/68] Operation and installation manual

Operation and Installation manual

Table 7.3.2.

7.3.2. Installation of refrigerant piping

Measure the necessary length of the connecting pipe, and make it by the following way.

1) Connect the indoor unit at first, then the outdoor unit.

2) Daub the surfaces of the flare pipe and the joint nuts with frozen oil, and wrench

it for 3~4 rounds.

3) With hands before fasten the flare nuts. Be sure to use two wrenches

simultaneously when you connect or disconnect the pipes.

See the table 7.3.2. for tightening torque.

Pipe

gauge

Tightening

torque, N•m

Flare dimension A (mm)

Min Max

Flare shape

Φ6.4 15~16 8.3 8.7

Φ9.5 25~26 12.0 12.4

Φ12.7 35~36 15.4 15.8

Φ15.9 45~47 18.6 19.1

Φ19.1 65~67 22.9 23.3

7.3.3. Vacuum dry and leakage checking

Use vacuum pump to change the moisture (liquid) into steam (gas) in the pipe and

discharge it out of the pipe to make the pipe dry. Under one atmospheric pressure,

the boiling point of water(steam temperature) is 100. Use vacuum pump to make the

pressure in the pipe near vacuum state, the boiling point of water falls relatively. When

it falls under outdoor temperature, the moisture in the pipe will be vaporized.

Common vacuum dry procedure:

1) Vacuum dry (for the first time) — connect the all-purpose detector to the inlet of

liquid pipe and gas pipe, and run the vacuum pump more than two hours (the vacuum

pump should be below -755mmHg).

2) If the pump can’t achieve below -755mmHg after pumping 2 hours, moisture or

leakage point will still exist in the pipe. At this time, it should be pumped 1 hour more.

3) If the pump can’t achieve -755mmHg after pumping 3 hours, please check if there

are some leakage points.

4) Vacuum placement test: place 1 hour when it achieves -755mmHg, pass if the

vacuum watch shows no rising. If it rises, it shows theres moisture or leakage point.

5) Vacuuming from liquid pipe and gas pipe at the same time.