Agilent 7820 GC Service
239
When the oven has cooled, turn off all gas supplies.
Switch the solenoid valve off so the actuator is in its fully
extended position (piston rod extended).
If variable restrictors are present, remove their mounting
hardware in the following order: two Torx T-20 screws, hex nut,
and mounting bracket for each restrictor valve.
Remove the two Torx T-20 screws securing the valve box top
assembly to the standoffs. Lift the valve box top assembly
straight off the valve box. Be careful not to move the valve rotor
index pin from its "at rest" position.
If valve/actuator alignment is to be made, see
Valve/Actuator Alignment ( 246) in this section.
To reassemble: Align the two mounting holes in the valve box top
assembly with the standoffs in the valve box. Lower the box top
assembly until it rests on the standoffs.
Secure the valve box top assembly with two Torx T-20 mounting
screws. Tighten these screws firmly. Reinstall hardware for
variable restrictors if present.
Exercise the valve(s) on and off a few times to verify operation.
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