234
Agilent 7820 GC Service
Valve Box
Installing the valve box
The valve box sits on top of the GC and contains the valves and
plumbing, heated zones and sensors, and the insulation.
1 Use a pair of diagonal cutters to remove the metal cutout on
the top of the GC.
Be careful of sharp edges!
Cut toward the outside edge of the tabs so that the valve box
will fit correctly.
Screw the aluminum standoffs into the valve box bottom plate
using one Torx T-20 screw for each standoff.
Screw the valve box bottom plate onto the top of the GC using
three Torx T-20 screws.
There are six holes in the plate for up to four valves. The outside
holes on each side of the plate are for valves and the inside
holes are for plumbing into the GC. Punch out the pre-perforated
insulation from the holes you plan to use.
Use two Torx T-20 screws to mount the heater block(s) on the
valve box bottom plate.
Install the heater/sensor into the heater block(s) and secure the
leads to the valve box bottom plate with the U-clamp and two
Torx T-10 screws.
Make sure that the sensor is seated all the way in
the heater block.
Insert the valve(s) into the appropriate hole(s) in the heater block
and secure each valve with two long Torx T-10 screws.
Plumb the valves in the appropriate configuration. A variety of
valve configurations are diagrammed in the Typical Valve
Configurations section in this chapter.
Orient all of the valves in the OFF (CCW) position.
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