Ingersoll-Rand SSR UP5-4 Operation And Maintenance Manual page 24

22
OPERATING INSTRUCTIONS
COMPRESSOR CONTROLS
Direct online starting:
The compressor is equipped for Automatic Start & Stop Control.
When the receiver tank pressure reaches the factory pre–set
maximum pressure, the pressure switch stops the unit. When the
receiver tank pressure drops below the factory pre–set minimum. The
pressure switch resets and restarts the unit.
The pressure switch cover can be removed by unscrewing the two
screws holding the cover.
Pressure switch adjustment:
The compressor package will cut–in and cut–out at factory preset
pressure settings. Adjust the pressure switch only if absolutely
necessary.
Adjustments are to be carried out only when the switch is mounted,
under pressure and voltage–free.
WARNING
High voltage is present at the pressure switch contacts when the
power supply is connected. Disconnect, lock and tag main power
supply before making adjustments.
WARNING
Do not adjust the pressure switch to exceed the maximum
discharge pressure of the unit
NOTE
When replacing the pressure switch cover, ensure the selector
knob on the cover and the lever on the switch are both in the "OFF" posi-
tion.
NOTE
When the compressor is equipped with the optional dryer and filters,
the pressure switch differential should be increased 10psi to account
for the added pressure drop of the filters and dryer.
A. Upper Pressure Setting
B. Pressure Differential
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AUTOMATIC START & STOP CONTROL
NOTE
Automatic Start & Stop Control is intended for use when the motor
will start no more than 6 times per hour.
When the receiver tank pressure reaches the factory pre–set
maximum pressure, the pressure switch stops the unit. When the
receiver tank pressure drops below the factory pre–set minimum, the
pressure switch resets and restarts the unit.
DUAL CONTROL
Select either automatic start and stop control or constant speed
control by adjusting the knob on the auxiliary valve. For automatic start
and stop control, turn the knob on the auxiliary valve fully clockwise to
disable the auxiliary valve. The pressure switch will then start and stop
the unit.
Auxiliary Valve.
A. Knob
B. Clockwise
C. Counterclockwise
Select constant speed control if the unit restarts in less than 10 minute
intervals or runs more than 40 minutes per hour. Turn the knob fully
counterclockwise to run the unit continually.
NOTE
The auxilIary valve is factory pre–set at 5 psig (0,3 bar) lower than
the factory pressure switch setting.
CAUTION
Running unloaded with no air demand, will cause the unit to be shut
off by the pressure switch.
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