Separator Element Replacement; Control System Adjustment - Sullair LS-100L Operator's Manual

SEPARATOR ELEMENT REPLACEMENT

Refer to Figure 7-3. The separator elements must
be changed when the maintenance gauge shows
red with the compressor running full load, or once a
year, whichever occurs first. Follow the procedure
explained below for separator element replace-
ment.
1. Relieve all pressure from the sump tank and all
compressor lines.
2. Disconnect all piping connected to the sump
cover to allow removal (return lines, service
lines, etc.).
3. Loosen and remove the eight (8) hex head cap-
screws (1/2-13 x 1 1/2") from the cover plate.
4. Lift the cover plate from the sump.
5. Remove the separator element.
6. Inspect the receiver/sump tank for rust, dirt, etc.
7. Scrape the old gasket material from the cover
and flange on the sump. Be careful not to let the
scraps fall in the sump.
USE PROVIDED GASKET(S) ONLY.
DO NOT remove grounding staple(s) from the
replacement element's gasket.
DO NOT use any type of gasket eliminator, as it
can insulate the staples causing the element not to
be properly grounded for operation.
Figure 7-4 Pressure Switch
8. Reinsert the separator element into the sump
taking care not to dent the element against the
tank opening.
9. Clean the underside of the receiver/sump tank
cover and remove any rust.
10. Replace the cover plate, washers and cap-
screws. Torque to 55 ft-lbs. (75 Nm).
11. Reconnect all piping making sure return line
tubes extend to the bottom or 1/4" (6mm) above
the bottom of the separator element. This will
assure proper fluid return flow to the compres-
sor.
12. Clean the return line strainers before restarting
the compressor.

CONTROL SYSTEM ADJUSTMENT

Refer to Figure 7-4. Prior to adjusting the Control
System, it is necessary to determine the desired
operating pressure range and also the maximum
pressure at which your compressor is to operate.
The pressure must not exceed the maximum oper-
ating pressure which is stamped on the compressor
serial number nameplate. The following explanation
applies to a typical installation with a desired oper-
ating range of 125 to 135 psig (8.6 to 9.3 bar). This
information will apply to a compressor with any
other operating range excepting the stated pres-
sures.
Remove the cover of the pressure switch. With the
shut-off valve closed (or slightly cracked open) start
the compressor. Observe the line pressure gauge
and pressure switch contacts. When the line pres-
sure reaches 135 psig (9.3 bar), the pressure
switch contacts should open. If the pressure switch
contacts do not open or they open prior to the
desired pressure, the pressure switch setting will
require adjustment (refer to Figure 7-4).
FOR PRESSURE RANGE ADJUSTMENT:
1. Remove cover to pressure switch.
2. Turn the range adjusting screw to the high pres-
sure setting. Turning the screw counterclock-
wise lowers both the high and low pressure
equally.
FOR DIFFERENTIAL ADJUSTMENT:
Differential is the difference between the high and
low pressure settings. 10 psig (0.7 bar) is typical.
1. Turn the differential adjusting screw to the lower
(reset) setting. Turning the screw counterclock-
wise widens the differential by lowering the reset
(lower) setting only.
2. When the pressure switch adjustment is com-
Section 7
MAINTENANCE
41