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NM3
5.9
Vaporizer Select Switch Adjustment
5.9.1
Set the System Power switch to STANDBY.
5.9.2
Remove the four screws holding the rear panel of the vapor box, and
remove the panel.
5.9.3
Remove the two screws holding the oxygen ratio monitor/controller to
the bottom panel of the vapor box. Remove the four screws holding
the bottom panel of the vapor box, and remove the panel.
5.9.4
Remove the four screws holding the front cover. Carefully lower the
cover so that it is supported by the wire harnesses joined to its circuit
board.
5.9.5
At the circuit board, disconnect the wire harness for the switch that
is being adjusted, and connect an ohmmeter to the wire harness.
5.9.6
With the corresponding vaporizer handwheel at zero, the switch
should be open. When the vaporizer is turned on, the switch contacts
should close.
Loosen the adjusting screw locknut and turn the adjusting screw to
raise or lower the switch bracket until the correct action is achieved.
Tighten the locknut when the adjustment is completed. Refer to
Figure 5-11.
NOTE: When the switch adjustment procedure is completed, ensure that the
vaporizer handwheel is returned to its zero or OFF position.
5.9.7
Disconnect the ohmmeter and connect the wiring harness to the
circuit board.
5.9.8
Replace the front cover, carefully guiding the gas selector switch cam
into its spring, and secure the cover with its four mounting screws.
5.9.9
Replace the bottom panel of the vapor box and secure it with the four
screws. Replace the two screws that hold the oxygen ratio
monitor/controller to the bottom panel.
5.9.10
Replace the rear panel of the vapor box and secure it with the four
screws.
5.9.11
Perform the PMS Procedure given in Section 6.
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ADJUSTMENT AND CALIBRATION PROCEDURES (continued)
5-29
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Troubleshooting
