5-37
10. Release the negative pressure ball. If the negative pressure ball is fully expanded
within 30 s during one of the two tests, it indicates that the system switch assembly is
damaged. Handle this problem as described in the troubleshooting table.
5.3.3.4 Leak Test of the O2-N2O Cut-off Valve Assembly
Perform a leak test of the O-N2O cut-off valve assembly by using the following tools:
Negative pressure ball (quantity:1)
3106-06-00 adapter connector (quantity:1)
3106-04-06 adapter connector (quantity:1)
PU tube (6X100) (quantity:1)
Test procedures:
1. Turn off the pipeline gas supplies and turn on the system switch. Bleed the residual
pressure by turning on the flow regulators. Then turn off the system switch.
2. Pull out No.49 PU tube which connects the O2-N2O cut-off valve assembly to the
N2O flow regulator (this test is not required in case of O2+AIR configuration or single
O2 configuration). The end of the tube which connects the O2-N2O cut-off valve
assembly is not pulled out but the other end is.
3. Pull out No.47 PU tube which connects the system switch assembly to the O2-N2O
cut-off valve assembly. The end of the tube which connects the O2-N2O cut-off valve
assembly is not pulled out but the other end is.
4. Pull out No.48 PU tube which connects the N2O supply inlet assembly to the O2-N2O
cut-off valve assembly. The end of the tube which connects the O2-N2O cut-off valve
assembly is not pulled out but the other end is.
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