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6.9.3 Check the water level by observing the liquid level sight glass installed near
the operating liquid overflow connection on the back of the unit.
6.9.4 If this is the first time the unit is being installed or run, add water to the inlet
of the system to prime the pump. For the 3AL2041 through 3AL2241 add 0.4
gallons (1.5 liters); for larger systems add 1.3 gallons (7 liters).
6.10 Connect the inlet of the system to the local vacuum header or source
requiring the vacuum production of the unit.
6.10.1 Ensure that no pipe stress is present on the system; application of stress
to the inlet can cause the system to leak, malfunction, or fail.
6.10.1.1 Remove the pipe plug before connecting the inlet. The pipe plug is
inserted prior to shipment to keep foreign bodies out of the operating liquid sump.
6.10.2 A check valve is included with each 3AL system and additional check
valves are not required.
6.11 Connect a ¼ inch water supply line to the operating liquid make up and
spray line located on the back of the unit near the bottom of the perforated metal
grid.
6.11.1 Connect a drain hose to the overflow water connection on the back of the
unit. While not required for operation, failure to connect the overflow to a drain
will result in operating liquid spilling onto the floor.
6.12 In most cases, the exhaust air should be allowed to vent freely from the unit.
If installing discharge piping, ensure that the piping is large enough to keep the
operating discharge pressure below 5 psig and that no pipe forces are allowed to
be exerted onto the 3AL system (e.g. adequately support the piping).
6.13 Add accessories as recommended by your Airtech representative. The
following items are available and commonly applied depending on the local
circumstances.
6.13.1 Add an inlet filter if particulates may be present in the inlet gas stream.
6.13.2 Add an electronic level switch if remote monitoring of the liquid level in the
operating liquid sump is desired.
6.13.3 Add a temperature switch if shut-down on high discharge temperature is
required.
6.13.4 Add a temperature gauge if monitoring of the operating liquid sump
temperature is required.
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