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Section 5
MAINTENANCE
Figure 5-3 Penn Pressure Switch
close (cut-in pressure 100 PSI) .The standard pres-
sure switch has a minimum differential of 7 PSI and
a maximum of 26 PSI. Adjust the differential by turn-
ing the small slotted screw clockwise for differential
increase and counterclockwise for decrease.
Adjust the Barksdale pressure switch #241963 set-
ting by turning the thumbwheel (shown in Figure
5-4) either clockwise to increase the pressure set-
ting, or counterclockwise to decrease the setting.
This pressure switch has a fixed 10 PSI differential.
When the pressure switch adjustment is complete,
the pressure regulator should be adjusted for the
pressure at which modulation of air delivery should
begin. In this case, that pressure will be 100 PSI.
The regulator is adjusted by loosening the jam nut
on the end of the cone shaped cover of the pres-
sure regulator. When the jam nut is loose, turn the
adjusting screw clockwise to increase the pressure
setting or counterclockwise to decrease the set-
ting. Above 100 PSI, the regulator should allow
pressure to flow into the control chamber of the Sul-
licon Control. At this time, the Sullicon Control lever
should start to move.
After the control pressures have been adjusted, the
"unloaded" sump pressure must be adjusted. If
your machine is equipped with a Barksdale pres-
sure switch it will be necessary to shut the machine
18
down, remove the pressure switch cover and dis-
connect one of the three lead wires that are con-
nected to the micro-switch. After disconnecting the
lead, tape the exposed wire with electricians tape
to make sure that it does not come in contact with
any metallic surface.
DANGER
DO NOT touch the electrical contacts,
terminal or leads with any metallic ob-
ject. Severe electrical shock will occur.
With the lead taped you may start the machine
again. Allow the sump pressure to stabilize and ad-
just the unloaded sump pressure by turning the
Sullicon Control stop screw until the sump pres-
sure reads 40-55 PSI. The stop screw is turned
clockwise to increase the pressure and counter-
clockwise to decrease the pressure.
Once this is accomplished shut the machine down
once again and reconnect the taped lead and re-
place the pressure switch cover. At this time start
the machine and cycle the Control System several
times and recheck all pressure settings and adjust-
ments.
If your machine is equipped with a Penn pressure
switch the "unloaded" sump pressure is best ad-
Figure 5-4 Barksdale Pressure Switch
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