MSG Equipment MS121, Руководство пользователя

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When the electromagnetic valve is faultless, the valve supply current will change, as wellas the
pressure in the HP and LP lines. The absence of these changes will signify the valve failure.
User Manual – Tester MSG MS121
Mind that some electromagnetic clutches may have a limiting diode in the construction
smoothing the voltage pulsation in the clutch supply circuit. If there is
a diode in the clutch under testing, the corresponding diode indicator will
appear on the tester display.It is also possible to test the clutch and valve
directly on the vehicle without removing the air conditioning com -
pressor. In this case the vehicle battery can be used to power the tester. For this type of testing it is
also recommended to use a device for measuring the refrigerant pressure in the air conditioning
system which is preliminary connected to the service outputs according to the diagram below:
The electromagnetic clutch is faultless under the following indicators:
• "Current" value should range between ХХ А up to YY А
• "Voltage" value should range between 10÷14V
• when "CB" or "SC" indication is absent on the screen
Press the testing start button