Section 7
MAINTENANCE
31
Figure 7-3 Separator Element (P/N 02250091-385)
*
*Replacement Element Kit P/N 02250083-659
*
*
5. Install element and gaskets (2).
6. Attach lower baffle and tighten firmly.
7. Replace bowl seal.
8. Screw bowl into body and tighten firmly.
NOTE
Be certain to connect a water drain line, leading
away from compressor, at the moisture drain out-
let located on the side of the compressor package
below compressor air discharge pipe.
CONTROL SYSTEM ADJUSTMENT- STAN-
DARD ELECTRO/MECHANICAL
Ref er t o F igur e 7 -- 4. P r ior t o adjus t ing t he Cont r ol
System, it is necessary to determine the desired op-
erating pressure range and also the maximum pres-
sure at which your compressor is to operate. The
pressure must not exceed the maximum operating
pressure which is stamped on the compressor serial
number nameplate. The following explanation ap-
plies to a typical installation with a desired operating
range of 100 to 110 psig (6.9 to 7.6 bar). This in-
formation will apply to a compressor with any other
operating range excepting the stated pressures.
Remove the cover of the pressure switch, pressure
regulator and inlet valve as required. 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 pressure
reaches 110 psig (7.6 bar), the pressure switch con-
tacts should open. If the pressure switch contacts
do not open or they open prior to the desired pres-
sure, the pressure switch setting will require adjust-
m ent ( r ef er t o F igur e 7 -- 4) .
FOR PRESSURE RANGE ADJUSTMENT
:
1. Remove cover to pressure switch.
2. Turn the range adjusting screw to the high pres-
sure setting. T urning the screw counterclockwise
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. T urning the screw counterclock-
wise widens the differential by lowering the reset
(lower) setting only.
2. When the pressure switch adjustment is com-
plete, the pressure regulator should be adjusted
for the pressure at which modulation of air deliv-
ery should begin. In this case that pressure will
be 103 psig (7.1 bar). The regulator is adjusted
by loosening the jam nut on the end of the cone
shaped cover of the pressure regulator. When
the jam nut is loose, turn the adjusting screw
clockwise to increase or counterclockwise to de-
crease the setting.
3. To set the regulator, continue closing the service
valve, until the line pressure is 103 psig (7.1 bar).
At this point regulator should pass a signal to the
inlet valve to start closing it. If the line pressure
keeps on rising or if the modulation does not be-
gin, adjust the regulator valve as described
above. After adjustment line pressure should be
Figure 7-4 Pressure Switch (P/N 040694)
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