Sullivan-Palatek DC185P3JD User Manual Download

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COMPONENT DESCRIPTION

3.6.2 BUTTERFLY VALVE (1300–1800 CFM)

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fully open and the pneumatic valve will take over. With the start-run valve in the start position, the unit will

unload when the air receiver reaches 20 psi.

3.6.3 START-RUN (LOAD-UNLOAD) VALVE

The start-run (load-unload) valve is used to by-pass the compressor pressure regulator valve. This results in

reduced load and reduced engine speed at start-up. Once the engine is warmed up, the valve is moved to
the

RUN

position. In the

START

position, the start-run valve is open. In the

RUN

position, it is closed.

3.6.4 REGULATOR VALVE (DISCHARGE PRESSURE)

This valve is used to select the desired discharge pressure within the operating pressure range. Turning the

regulator adjustment screw clockwise increases the unloaded pressure, and counter-clockwise reduces
the unloaded pressure. Observe discharge pressure gauge on the instrument panel for compressor
discharge pressure.

3.6.5 AUTOMATIC BLOWDOWN VALVE

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however, at shutdown, the inlet valve closes, the unit becomes pressurized and sends a pressure pulse to
open the normally closed blow down valve.

3.6.6 RECIRCULATING

VALVE

This valve functions automatically in response to the regulated control pressure. Receiving the unload

signal to the inlet valve, the recirculation valve is opened allowing a small quantity of pressurized sump air
to be recirculated through the compressor in order to hold a positive pressure signal on the inlet side of
the air end to prolong the shaft seal life.

3.7

NOISE CONTROL SYSTEMS

Noise control systems incorporated in this compressor have been designed to meet the requirements of
federal noise control regulations. The principal components of the noise control systems include the enclo-
sure, engine exhaust system, and compressor intake system. The enclosure has been designed to provide

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cooler. Additionally, low noise emission is a key factor in selecting diesel engines to power the compressors.

3.8 INSTRUMENT

PANEL

The instrument panel contains all the necessary controls and instrumentation for operation. It is conve-

niently located and enclosed by a lockable, hinged door. Following is an explanation of the principal
controls and instruments:

3.8.1 START-RUN (LOAD-UNLOAD) SWITCH

The start-run (load-unload) valve is provided to unload the compressor for easier start-up in cold weather.

When positioned on

START (UNLOAD)

, this valve bypasses the pressure-regulating valve, thereby closing

the inlet valve with reduced discharge pressure. After the compressor is warmed up, the start-run (load-
unload) valve can be turned to

RUN (LOAD)

position. The unit is then ready for full-load operations. Prior

to shutdown, the start-run (load-unload) valve must be turned to the

START

position and the service valve

opened and closed to reduce pressure to approximately 70 psi. Shutdown under full load can damage the
compressor and put unnecessary strain on the drive components.

3.8.2 VOLTMETER

(OPTIONAL)

The voltmeter indicates the condition of the battery prior to start-up. When running, it tells whether the

alternator and voltage regulator are operating properly. The normal reading should be 13 to 15 volts during
operation in a 12-volt system and 25 to 27 volts in a 24-volt system.

3.8.3 HOURMETER

The hourmeter records the total number of operating hours. It serves as a guide for following the recom-

mended inspection and maintenance schedule as outlined in the Lubrication and Maintenance section of
this manual.