TM 5-4310-371-14
2-5. COMPRESSOR UNIT PREPARATION PRIOR TO OPERATION.
a. Release all the air receiver pressure by first turning the globe valve, counter clockwise, to the open position (see
b. Drain the air receiver of all its water by turning the air receiver drain counter clockwise, to the open position (see
figure 2-1, item 1). When all the water has drained out, close air receiver drain clockwise, until air receiver drain
is in the closed position (see figure 2-1, item 1).
2-6. OPERATION OF COMPRESSOR UNIT.
a. To start compressor unit, press the black button on the starter switch marked "START". As the air receiver
pressure increases, check for air leaks. An air leak can be found by a hissing sound which is the air escaping
rapidly from a malfunctioning joint or part. in case of such a leak, immediately shut compressor unit off by
pressing the red button marked "STOP" on the starter switch and advise next higher level of maintenance.
b. Note, that once compressor unit has pumped air pressure up to maximum operating pressure of 195 PSI (1350
KPa), compressor unit will shut off until operating point of falling pressure reaches 175 PSI (1210 KPa) when
compressor unit will again begin pumping air.
c. To stop compressor unit for total shutdown or repairs, press red button on starter switch marked "STOP".
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-7. OPERATION in EXTREME COLD (0F - 18F).
a. Select the correct lubricants for the expected air temperatures as indicated on the lubricant chart.
b. Drain condensation from air receiver prior to shutdown while unit is still warm.
c. When possible, install the compressor unit in a properly protected shelter. Protect motor and magnetic starter
from ice and snow.
2-8. OPERATION in EXTREME HEAT.
a. Locate the compressor unit in a well ventilated area that will allow maximum amount of air to circulate through
motor and compressor.
b. Check oil levels frequently. Fill if necessary.
c. Keep outside of motor and compressor clean. Dirt acts as an insulator which prevents heat from escaping into
the air.
2-5
