SVC 3- 26
12. With a Pozidriv screwdriver, remove the mounting screw from the rear of the block. (The block
must be removed from the rear of the instrument.)
RESTRICTOR
INLET FITTING
OUTLET FITTING PLATE
ON/OFF VALVE
NEEDLE VALVE
ASSEMBLY
REAR CLAMPING PLATE
FLOW MANIFOLD
BLOCK (TYPICAL)
FRONT CLAMPING
PLATE
FID/FPD IGNITION
VALVE
PLUG VALVE
COMPRESSION
SPRING
AUXILIARY
INLET FITTING
FID/FPD IGNITION
MICRO SWITCH
WELDMENT
13. Install the new block on the flow panel from the rear of the instrument. The block fits on the
panel over two standoffs, in only one direction.
14. Replace the mounting screw on the block and tighten it firmly.
15. Connect the plumbing on the rear of the block. The fittings are labelled on the block. In addi-
tion:
D
On an FID/NPD, replace the hydrogen and air tubes. The hydrogen tube (painted red) con-
nects to the lower fitting. The gas tube retainer fits properly only when the hydrogen and
air tubes are installed correctly.
D
On an FID or FPD block, connect the ignitor leads. (The leads may be reversed without
consequence.)
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