Ingersoll-Rand TS8 Owner's Manual page 11

CAUTION
Unusual noise or vibration indicates a problem. Do not continue
to operate until you identify and correct the source of the
problem.
NOTICE
Ensure the direction of rotation is correct per the arrow on the
motor or on the beltguard above the motor. If the rotation is
incorrect on three phase compressors, disconnect the main
power and contact a qualified electrician to interchange any
two of the three leads per the ELECTRICAL CONNECTIONS
section of this manual.
COMPRESSOR CONTROLS (ELECTRIC MOTOR
COMPRESSORS)
AUTOMATIC START & STOP CONTROL.
NOTICE
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 preset maximum
pressure, the pressure switch stops the compressor. When the receiver
tank pressure drops below the factory preset minimum, the pressure
switch resets and restarts the compressor.
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 compressor.
Auxillary Valve
NOTICE
For dual control compressors, automatic start and stop is
preferred.
Select constant speed control if the compressor restarts in less than 10
minute intervals or runs more than 40 minutes per hour. Turn the knob
fully counterclockwise to run the compressor continually.
NOTICE
The auxiliary valve is factory preset at 5 PSIG lower than the
factory pressure switch setting.
CAUTION
Running unloaded for more than 20 minutes per hour or more
than 15 minutes continually with the use of constant speed
control will cause oil pumping and should be avoided.
22607402 Rev.J
RELEASED 03/Aug/2021 20:37:49 GMT
PRESSURE SWITCH ADJUSTMENT
CUT-IN & CUT-OUT.
The cut-out (compressor shut-down) is the pressure at which the
switch contacts open, and the cut-in (compressor restart) is the
pressure at which the switch contacts close. See COMPRESSOR
CONTROLS.
STANDARD PRESSURE SWITCH. The Standard NEMA-1 Pressure
Switch is Pre-set at the required pressures and the range and
differential settings ARE NOT adjustable. These Pressure Switches
should not be tampered with in any way and no attempt should be
made to adjust the pressure settings as this could damage the Switch
to the point of failure and/or void any warranty for the Pressure
Switches.
ADJUSTMENT PROCEDURES (ADJUSTABLE SWITCHES):
1. Remove the pressure switch cover.
2. Set the cut-in pressure with the range adjustment nut. Turn the nut
clockwise (in) to increase the pressure or counter-clockwise (out) to
decrease the pressure.
3. Set the cut-out pressure with the differential adjustment. Turn the
differential adjustment nut clockwise (in) to increase the pressure or
counter-clockwise (out) to decrease the pressure.
4. Replace the cover, reconnect the power supply and start the unit.
5. Note the pressure gauge reading at which the unit cuts out.
6. Repeat the adjustment procedure if necessary.
The minimum possible differential is approximately 20% of cutout
pressure. It is advisable to have as wide a differential as possible to
avoid frequent starting and stopping of the unit. Note the pressure
gauge reading at which the unit cuts-out and re-establish this point if
necessary.
Note the interaction between the range and differential adjustments,
i.e., if the cut-out is increased, the differential will also increase,
or if the differential is narrowed, the cut-out will be reduced, etc.
These factors must be considered when adjusting the switch and
compensated for accordingly.
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.
CAUTION
Do not adjust the pressure switch to exceed the maximum
discharge pressure of the unit.
NOTICE
Adjust the pressure switch only if adjustments are absolutely
necessary.
NOTICE
Some pressure switches are equipped with an on-off lever used
to open and close the electrical contacts inside the switch.
THIS LEVER IS NOT A DIFFERENTIAL ADJUSTMENT CONTROL.
The pressure switches with the on-off lever do not have a
differential adjustment control.
NOTICE
One full turn changes the setting approximately 2 PSIG.
NOTICE
One full turn changes the setting approximately 2 PSIG.
EN-11