Ingersoll-Rand 2000P owner manual Operation, LOW OIL Level Switch, Intermittent Duty Formula

LOW OIL LEVEL SWITCH

A float activated low oil level switch may be installed to protect your unit against damage due to insufficient compressor oil level. Low oil level in the compressor crankcase causes the switch contacts to open, thus shutting the unit down until the proper oil level has been restored.

Proper protection against low oil level depends on proper adjustment of the low oil level switch. During the initial run, stop the unit and drain one quart of oil from the compressor crankcase into a suitable clean container. Listen for the switch to click or check the switch with a continuity tester.

The float sometimes gets cocked or stuck during shipping. If the float is cocked or stuck, open the disconnect switch, drain the remaining oil, remove the crankcase cover and then free the float. Reassemble and then reuse the same oil.

NOTE	If the float is cocked in the low position, the unit
	cannot start.

OPERATION

INTERMITTENT DUTY FORMULA

Units operating above 200 PSIG are to be operated according to the "Intermittent Duty Formula."

INTERMITTENT DUTY FORMULA

Pump-up time should not ordinarily exceed thirty (30) minutes or be less than ten (10) minutes. Shutdown periods between cycles of operation should be at least equal to the pump-up time. Note: When the compressor is regulated by constant speed control, the shutdown period is the time the compressor is operating unloaded.

A pump-up time limit with the following cool-down period is recommended to protect the valves and heads against stabilized high operating temperatures, which could rapidly build up carbon in these areas.

All inquiries for high-pressure compressor application where the "use" cycle differs from the "Intermittent Duty Formula" should be referred to Ingersoll-Rand.

START-UP (ELECTRIC MOTOR DRIVEN MODLES)

1.Close the service valve.

2.Release any remaining tank pressure by slowly opening the manual drain valve.

3.Close the manual drain valve and apply power to the compressor. If the pressure switch is equipped with an “ON/AUTO-OFF” lever, flip the switch to the “ON/AUTO” position. If the unit is equipped with a control panel “ON/OFF” switch, move the switch to the “ON” position.

Typical Pressure Switch

4.Slowly open the service valve.

5

Typical Service Valve (A = Open, B = Closed)

aCAUTION	Unusual noise or vibration indicates a
	problem. Do not continue to operate until you
	identify and correct the source of the
	problem.
NOTE	Ensure the direction of rotation is correct per
	the arrow on the motor. If the rotation is
	incorrect on three-phase units, interchange
	any two of the three leads.

COMPRESSOR CONTROLS

ADJUSTMENT PROCEDURE. 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.

NOTE	For dual control models, automatic start and
	stop is preferred.

Auxiliary Valve.

Auxiliary Valve.

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
	lower than the factory pressure switch
	setting.
NOTE	Automatic Start & Stop Control is intended for
	use when the motor will start no more than 6
	times per hour.
aCAUTION	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.

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