Ingersoll-Rand 2000P owner manual Pressure Switch Adjustment, Electric Drain Timer Settings

PRESSURE SWITCH ADJUSTMENT

aWARNING	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.
aCAUTION	Do not adjust the pressure switch to exceed
	the maximum discharge pressure of the unit.
NOTE	Adjust the pressure switch only if
	adjustments are absolutely necessary.

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.

ADJUSTMENT CONTROLS. All pressure switches have a range adjustment control (A). Some pressure switches also have a differential adjustment (B) control. On switches without a differential adjustment control, the span between cut-in and cut-out pressure levels switches is factory set for 40 ± 4 PSIG and cannot be adjusted.

NOTE	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.

ADJUSTMENT PROCEDURES (SWITCHES WITHOUT DIFFERENTIAL ADJUSTMENT CONTROL):

1.Remove the pressure switch cover.

2.Adjust the range by turning the range adjustment screw clockwise (in) to increase the cut-out point or counter-clockwise (out) to decrease the cut-out point.

NOTE:	One full turn changes the setting
	approximately 2 PSIG.

3.Replace cover, reconnect power supply and start the compressor.

4.Note the pressure gauge reading at which the compressor cuts out.

5.Repeat adjustment procedure if necessary.

Pressure Switch Range Adjustment

ADJUSTMENT PROCEDURES (SWITCHES WITH DIFFERENTIAL ADJUSTMENT CONTROL):

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.

NOTE: One full turn changes the setting approximately 2 PSIG.

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.

6

NOTE:	One full turn changes the setting
	approximately 2 PSIG.

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.

ELECTRIC DRAIN TIMER SETTINGS

The "time off" setting determines the interval between cycles from

30 seconds to 45 minutes. The "time on" setting determines the actual time the compressor drains condensate from the 1/4" or 1/2” condensate outlet port.

The timer’s cycle rate and drain opening time should be adjusted to open just long enough to discharge the condensate. The timer is properly set when it opens and discharges condensate and then vents air for approximately one second before closing. Adjustments may be made depending on many factors, including humidity and duty cycle.

OIL PRESSURE ADJUSTMENT (MODEL 2000P)

For pressure lubricated compressors, the oil pressure should be checked upon start-up by observing the oil pressure gauge. The acceptable operating range is 15-40 psig. It is normal for the oil pressure to vary slightly with oil temperature. Compressors equipped with an optional low oil pressure shutdown system will automatically shut down if the oil pressure drops below 10 psig.

The oil pump is equipped with an adjustable pressure regulator which may be reset if conditions warrant. Refer to the following illustration and instructions:

1.Use an adjustable wrench to remove the knurled cover for the valve on the right side of the oil pump housing (A).

2.Loosen the retaining nut (B) with a 7/16” wrench such that the threaded rod (C) is free to rotate.

3.Using a 1/8” hex key, adjust the threaded rod to the desired setting. Turning the rod clockwise increases the oil pressure setting, and turning the rod counterclockwise decreases the oil pressure.

4.When the oil pressure is set, tighten the retaining nut and replace the knurled cover.

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