Airwell KXV Series, Инструкция по эксплуатации

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Engineering manual
226
STEP 1
: Apply pressure 0.3Mpa (3.0kg/cm
2
G) for 3 minutes or more.
STEP 2
: Apply pressure 1.5Mpa (15 kg/cm
2
G) for 3 minutes or more.
STEP 3
: Apply pressure 3.73Mpa (38kg/cm
2
G) for approx. 24 hours.
Caution:
If there is no leakage, the pressure will not go down; Considering the change of ambient temperature, pressure
drop by 0.01MPa(0.1Kg/cm
2
G) per 1
°
C is normal in 24 hours after pressure is applied.
Leaked position check
: When pressure drop is detected in STEP1, STEP2, or STEP3, check the leakage at the
connecting points. Check leakage with hearing sense, feeler, foaming agent, etc, and perform re-brazing or re-tightening
of flare if leakage is detected.
1.4.11 Vacuum process
WARNING

For protection of the earth’s environment, do not discharge the refrigerant gas in the air.

Using a vacuum pump, eliminate the remaining air (nitrogen gas, etc.) in the unit. If gas remains, performance and
reliability of the unit may be reduced.
After the leakage test, discharge nitrogen gas. Then connect the gauge manifold to the service ports at suction gas side,
discharge gas side and liquid side, and connect the vacuum pump as shown in the following figure.

Be sure to perform vacuuming for suction gas side, discharge gas side and liquid side.

Be sure to perform vacuuming from both suction gas side, discharge gas side and liquid side.

Be sure to perform vacuuming from both liquid and gas sides at the same time.

Use a vacuum pump with counter-flow preventive function so that oil in the pump does not back up in the pipe of
the air conditioner when the pump has been stopped. (If oil in the vacuum pump enters in to the air conditioner with
Chart 1-27