SECTION 6 ES-6 USER MANUAL
73
FOR DIFFERNTIAL ADJUSTMENT OF AIR PRESSURE
S
WITCH
Differential is the difference between the high and
low pressure settings.
Turning the screw clockwise increases the
differential, and counterclockwise decreases the
differential pressure.
U
NLOADER SOLENOID VALVE MAINTENANCE
Unloader valve maintenance is minimal, but a
periodic cleaning is desirable. The time between
cleanings will vary depending on operating
conditions. In general, if the voltage to the coils is
correct, sluggish valve operation or excessive
leakage will indicate that cleaning is required.
It is not necessary to remove the valve from the pipe
line for repairs.
D
ISASSEMBLY AND REASSEMBLY
1. Remove the retaining cap and slip the entire
solenoid off the solenoid base subassembly.
2. Unscrew the solenoid base assembly.
Remove the core assembly, core spring and
body gasket.
3. All parts are now accessible for cleaning or
replacement.
4. Reassemble in reverse order of disassembly.
CO
IL REPLACEMENT
1. Remove the retaining cap, nameplate and
cover.
2. Slip the yoke containing the coil and sleeves
off the solenoid base subassembly.
3. Reassemble in reverse order of disassembly.
I
NLET CONTROL VALVE
Refer to Figure 6-7. The only parts which normally
require replacement are the piston seal on the intake
valve piston and gasket. Follow this procedure for
inlet control maintenance.
DANGER
DO NOT touch the electrical contacts, ter-
minal or leads with any part of the body or
any uninsulated metallic object.
Severe electrical shock may occur.
WARNING
Turn off all power, relieve sump pressure,
and disconnect coil lead wires to the
solenoid valve before making repairs.
WARNING
Before doing compressor maintenance,
disconnect compressor from power source
and lock out power source. Isolate
compressor from line pressure by closing
recommended discharge shut-off valve and
releasing all internal pressure from
compressor.
Table 6-2: Modulating Control Pressure Settings
PRESSURE SWITCH SETTING
250025-299
MODULATING CONTROL VALVE 250017-280
Rising Pressure (PSIG/BAR) Falling Pressure (PSIG/BAR)
Press Switch
Opening PSIG/
BAR
Press Switch
Closing PSIG/
BAR
Start Unloading Fully Unloaded Start Unloading Fully Unloaded
100/6.9 70/4.8 87/6 95/6.6 93/6.4 85/5.9
125/8.6 95/6.6 112/7.7 120/8.3 118/8.1 110/7.6
150/10.3 120/8.3 137/9.4 145/10 143/9.9 135/9.3
175/12.1 145/10 162/11.2 170/11.7 168/11.6 160/11
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