Maintenance and functional test
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Functional test of the service cart
We recommend checking the service cart functions and for faults once a year or not later than the
maintenance interval indicated.
Compressor:
The compressor can be tested for its functional capability with the “Pressure test compressor“
special function (see chapter 6)
Suction pump: Verification of the function and the final vacuum
Do not connect any gas compartment.
Start the “Recovery of SF
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“ main function.
The pressure on the suction pump is controlled by two pressure switches.
If the suction pressure is less than pe 0.1 bar the suction pump starts running and the solenoid valve
upstream from the suction pump opens. When exceeding one of these switching points the suction
pump switches off and the solenoid valves close.
The compressor is still running.
The lower the output pressure the more the regulating valve opens.
Check the final vacuum on the pressure indication of the gas compartment and stop the gas
recovery.
If the indicated final vacuum (< pa 1 mbar) is not reached also follow the instructions in chapter 8
“Fault correction”.
Vacuum pump:
Uncouple the connecting hose from the service cart.
Start the “Evacuation“ main function.
Open the filling pressure reducer pos. 181 (set the max. filling pressure).
The vacuum pump and the vacuum controller must have reached their operating temperatures
(operating time about 15 minutes).
If the vacuum is less than 1 mbar stop the function.
(operating time about 15 min.)
Observe the vacuum on the vacuum controller. After 15 minutes the increase of pressure with the
vacuum pump being stopped should be less than 5 mbar.
Evaporator:
To allow the temperature probe in the evaporator to react quickly on the temperature
changes there should be SF
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-gas overpressure in the evaporator and no vacuum.
Preselect the “Filling“ function.
Start the automatic “Filling“ function.
The evaporator heating is controlled by a temperature regulating device.
The solenoid valve on the input of the evaporator, which releases the gas flow, is also controlled via
the temperature regulating device (The solenoid valve opens as soon as the evaporator has reached
its adjusted temperature).
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