Section 2
DESCRIPTION
15
2.9 INSTRUMENT PANEL GROUP, FUNCTIONAL DE-
SCRIPTION- ELECTRO-MECHANICAL CON-
TROLLER
Refer to Figure 2-5 for specific location of parts
described. For information on Supervisor Controller
panel group, see Section 5, Supervisor Controller.
The Electro-mechanical Controller Instrument
Panel Group consists of a panel containing the line
pressure, sump pressure and discharge tempera-
ture gauges, the air filter, the separator element and
the fluid filter, restriction gauges, along with START
and STOP push buttons and an hourmeter.
Refer to Figure 2-5 for locations of the following
indicators and controls:
• The line (terminal) pressure gauge is connected
to the dry side of the receiver downstream from the
check valve and continually monitors the air pres-
sure.
• The sump pressure gauge continually monitors
the sump pressure at the various load and/or
unload conditions.
• The discharge temperature gauge monitors the
temperature of the air leaving the compressor unit.
For both air-cooled and water-cooled compressors
the normal reading is approximately 180°F to 205°F
(82°C to 96°C).
• The air filter restriction gauge monitors the con-
dition of the air intake filter and shows in the red
zone (20 to 30” water [51 to 76 cm]) when filter
service is required. The compressor must be run-
ning fully loaded for an accurate indication.
• The START pad turns the compressor on.
• The STOP pad turns the compressor off.
• The hourmeter records accumulative hours of
operation for the compressor and is useful for plan-
ning and logging service operations.
• The POWER ON ( ) LED on the instrument
panel indicates when power to the compressor is
supplied.
• The ON LED indicates when the compressor is
running.
• The AUTO pad is used to enable automatic
control.
• The separator maintenance gauge monitors
condition of the separator element and shows in the
red zone when the element restriction is excessive.
• The fluid filter maintenance gauge monitors the
condition of the bearing lube filter element and
shows in the red zone when the element should be
changed.
Figure 2-4 Air Inlet System
“The Plastic Pipe Institute recommends against
the use of thermoplastic pipe to transport com-
pressed air or other compressed gases in
exposed above ground locations, e.g. in exposed
plant piping.” (I)
PVC piping should not be used with Sullube. It
may affect the bond at cemented joints. Certain
other plastic materials may also be affected.
(I) Plastic Pipe Institute, Recommendation B,
Adopted January 19, 1972.
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