4.4 Check the direction of rotation
WARNING
The direction of rotation is as indicated by the arrow mark cast on the motor fan
cover.
Ensure that the pump-motor rotates in the correct direction. If it does not, the
pump and your vacuum system can become pressurised.
If it is reversed, interchange K1 and K2 for single phase motor and interchange two of the three wires
for three phase motor.
4.5 Inlet
The pipe caliber connected to the inlet port should not be smaller than the inlet port diameter.
Otherwise the pumping speed will be decline.
Vacuum chamner
Vacuum valve
Vent valve
Vacuum gauge
Bellows
Vacuum pump
Fig.9 Connection vacuum chamber (example)
CAUTION
Vent valve is to prevent pump oil or oil vapor anti-sucking to vacuum chamber when the pump
stopping. Install it closer as possible to the vacuum chamber Install it on the inlet port of the
mechanical booster pump if the pump is used together with booster pump.
If the pump sucked the water or substance such as dust, powder and soon, it would impair the
ultimate pressure and further cause trouble.
Metal mesh on the inlet port is to keep foreign substances away from the pump unit. Be sure not to
take it out unless necessitated so to check it.
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