BrainBee multigas 8500, Руководство по обслуживанию, Страница: 24 / 78

ENGLISH 24 / 78 CAP. 6 - MAINTENANCE
MULTIGAS 8500
6.8 WEAR AND TIGHTNESS CHECK OF THE MANIFOLD
SOLENOID VALVE PISTONS
1. Apply the 2 pipes in the supports on the side of the machine and close the taps counter
clockwise.
2. Switch off the machine, remove the power supply cable and open the cover and the front
panel.
3. Close central tap (liquid side) of the tank with service kit key (about 7 clockwise turns)
4. Reconnect the power supply cable, turn on the machine (do not to touch terminals or printed
circuit boards)
5. Open the service menu
6. Select manual activations
7. In manual activations activate OUT R, OUT I, OUT A, C, wait for the LP gauge to show a
pressure of at least – 0.3 bar,
8. Switch off the machine and remove the power supply network cable
9. Close the other tap (gas side) of the tank with service kit key (about 7 clockwise turns)
10. Close the tap along the connecting pipe towards the capacitor
11. Dismantle the solenoid valve reel block with a wrench or 14mm spark plug wrench (No.1 in
the following figure)
12. With the 24 spark plug wrench (No.2 in the following figure) using the screwdriver as
handle, the valve sleeve can be removed
13. Evaluate whether the rubber is visibly ruined and swollen (the presence of a circular trace is
normal, but there must not be swells and grooves different from the circular one)
14. Blow the piston air channels with compressed air
15. Blow inside the sleeve and the manifold seat where the valve is screwed
16. Blow the seat of the valve on the aluminium base of the MANIFOLD
17. Do not use chemical products or cloths and brushes
18. In case of deteriorated gasket, it is preferable to replace the entire piston
19. Reassemble the solenoid valve by first mounting the piston and subsequently the block of the
electrical reel.
20. Once the solenoid valve mounting is complete, reopen the taps/valves of the tank
21. Close panel and cover, reconnect the power supply cable and turn on the machine again.
TEST UNDER PRESSURE
From the Service Menu “Manual activations”, in relation to the replaced valve, open (activate) or
keep closed the solenoid valves represented in the chart reported as follows.
Ensure that the tank pressure reaches the valve being serviced.
Check that the valve in question does not present refrigerant leaks through the identification of leaks
or pressure drops (over 200 mbar).