Pressure Switch Adjustment; Pressure Regulator Adjustment; Unloader Solenoid Valve Maintenance - Sullair ES-6 5H Operator's Manual And Spare Parts List

Table 6-2 Modulating Control Pressure Settings
PRESSURE SWITCH
SETTING
250025-299
Press. Switch
Opening PSIG/BAR
100/6.9
125/8.6
150/10.3
175/12.1
switch and pressure regulator valve. This is done by
following the instructions below.
!
DANGER
DO NOT touch the electrical contacts, terminal or
leads with any part of the body or any uninsulated
metallic object. Severe electrical shock may oc-
cur.

PRESSURE SWITCH ADJUSTMENT

1.Close ball valve to isolate the pressure regulator
valve and set selector switch to manual.
2. Remomve the pressure switch cover.
3. With the shut--off valve closed or slightly cracked
open, start the compressor.
4. Observe the line pressure gauge and pressure
swithc contacts. When the line pressure reaches
nameplate pressure, the pressure switch con-
tacts should open.
5. If the pressure switch contacts do not open or
they open prior to the desired pressure, the pres-
sure switch setting will require adjustment (refer
to F igur e 6 -- 6) . To adjus t t he pr es s ur e s w itc h,
turn the range adjusting screw to the high--pres-
sure setting equally.
6. Replace pressure switch cover.

PRESSURE REGULATOR ADJUSTMENT

1. Establish correct pressure switch adjustment by
following the above procedure.
2. Lower line pressure by opening the shut--off valve
until the compressor reloads.
3. Loosen the pressure regulator locknut and open
ball valve.
4. Close shut--off valve; the pressure will increase
depending on the setting of the regulator adjust-
ment screw. Thighten adjustment screw until the
line pressure gauge reads a pressure of 5 psi/ .34
bar below the pressure switch setting estab-
lis hed in Table 6 -- 2.
5. Open shut--off valve and observe operation.
Press. Switch
Closing PSIG/BAR Unloading
70/4.8
95/6.6
120/8.3
145/10
MODULATING CONTROL VALVE
250017- -280
Rising Pressure
(PSIG/BAR)
Start Fully
Unloaded
87/6 95/6.6
112/7.7 120/8.3
137/9.4 145/10
162/11.2 170/11.7
FOR DIFFERENTIAL ADJUSTMENT OF AIR
PRESSURE SWITCH:
Differential is the difference between the high and
low pressure settings.
Turning the screw clockwise increases the differen-
tial, and counterclockwise decreases the differential
pressure.
DO NOT touch the electrical contacts, terminal or
leads with any part of the body or any uninsulated
metallic object. Severe electrical shock may oc-
cur.

UNLOADER SOLENOID VALVE MAINTENANCE

Unloader valve maintenance is minimal, but a peri-
odic cleaning is desirable. The time between clean-
ings 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.
Turn off all power, relieve sump pressure, and dis-
connect coil lead wires to the solenoid valve be-
fore making repairs.
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 sole-
noid 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 re-
placement.
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.
Section 6
MAINTENANCE
Falling Pressure
(PSIG/BAR)
Start Fully
Unloading Unloaded
93/6.4 85/5.9
118/8.1 110/7.6
143/9.9 135/9.3
168/11.6 160/11
!
DANGER
!
WARNING
21