CLAS B.LINE AC 0550BL Mode D'emploi page 18

HU 0014BL
METAL TRANSFER PUMP
5. Testing of one-way valves
Many vacuum circuits use one-way in-line valves to apply vacuum in only one direction. To test the
operation of the valve, remove it from the circuit. Attach the fl uid vacuum tester (fi g.8) and operate
the pump to apply the vacuum. The valve must maintain the vacuum in one direction and not maintain
it in the other direction.
6. Testing of electrically operated vacuum solenoids
Electrically controlled vacuum electromagnets are commonly used in the control circuits of air
conditioning/ventilation systems, emission control systems, idle systems, etc. and controlling
their operation with the AC 0550BL is extremely simple. Locate the electromagnet to be tested
and remove the power line connected to the component under test. Connect the product to
the port of the solenoid valve (fi g.9) and start the engine. When the system is switched off ,
there should be a gauge reading equal to zero. Now turn the system to the "ON" position and
observe a gauge reading equal to the manifold vacuum. If there is no reading, remove the
vacuum supply line and test the manifold vacuum at this point. If a vacuum exists, it indicates
that the solenoid is defective or is not receiving a turn-on voltage (use a multimeter to test).
If vacuum does not exist, run the supply line back to the vacuum source checking for bends
or breaks