For Differential Adjustment Of Air; Pressure Switch; Unloader Solenoid Valve Maintenance; Inlet Control Valve - Sullair ES-6 SERIES User Manual

ES-6 USER MANUAL
until the line pressure gauge reads a pressure
of 5 psi/ 0.34 bar below the pressure switch
setting established in
5. Open shut-off valve and observe operation.
FOR DIFFERENTIAL ADJUSTMENT OF
AIR PRESSURE SWITCH:
Differential is the difference between the high and
low pressure settings.
Turning the screw clockwise increases the
differential, and counterclockwise decreases the
differential pressure.
DANGER
DO NOT touch the electrical con-
tacts, terminal or leads with any part
of the body or any uninsulated metal-
lic object. Severe electrical shock
may occur.
UNLOADER SOLENOID VALVE MAIN-
TENANCE
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.
WARNING
Turn off all power, relieve sump pres-
sure, and disconnect coil lead wires
to the solenoid valve before making
repairs.
Table 6B - Modulating Control Pressure Settings
PRESSURE SWITCH SETTING 250025-299
Press. Switch Press. Switch Closing
Opening PSIG/BAR PSIG/BAR
100/6.9 70/4.8
125/8.6 95/6.6
150/10.3 120/8.3
175/12.1 145/10
Table 6A.
MODULATING CONTROL VALVE 250017-280
Rising Pressure (PSIG/BAR)
Start
Unloading
87/6
112/7.7
137/9.4
162/11.2
Section 6 - MAINTENANCE
It is not necessary to remove the valve from the
pipe line for repairs.
DISASSEMBLY 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 gas-
ket.
3. All parts are now accessible for cleaning or
replacement.
4. Reassemble in reverse order of disassembly.
COIL 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.
WARNING
Before doing compressor mainte-
nance, disconnect compressor from
power source and lock out power
source. Isolate compressor from line
pressure by closing recommended
discharge shut-off valve and releas-
ing all internal pressure from com-
pressor.

INLET 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.
Falling Pressure (PSIG/BAR)
Fully Start
Unloaded Unloading
95/6.6 93/6.4
120/8.3 118/8.1
145/10 143/9.9
170/11.7 168/11.6
Fully
Unloaded
85/5.9
110/7.6
135/9.3
160/11
42