B-6 External Connections
6. Connect an approximately 36.4-cm (2.5-inch) length of 12.7-mm clear
PVC exhaust tubing to the roughing pump exhaust port NW25 nozzle
fitting. Secure the tubing with a hose clamp.
7. Connect an elbow to the other end of the PVC exhaust tubing, and
connect the elbow to one of the fittings on the exhaust trap bottle
(included in the startup kit).
Caution:
• To prevent condensation from forming in the exhaust tubing
between the roughing pump and the exhaust trap bottle, you
must minimize the length of the tube.
• To avoid gas leaks, use the sharp knife to cut the PVC exhaust
tubing squarely (that is, perpendicular to its horizontal axis).
Caution: To prevent condensation from draining backward and
damaging the pump, the exhaust tubing must be installed with
an exhaust trap bottle; the bottle must be positioned at or below
the roughing pump exhaust port.
Exhaust trap bottle
Exhaust port
Elbow
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