Section 4
600H, 750, 750H, 750HH, 825, 900, 900H, 1050 T3 CAT User Manual 4: Operation
02250197-981 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 51
Operation
4.1 General
While Sullair has built into this compressor a comprehen-
sive array of controls and indicators to assu
re you that it
is operating properly, you will want to recognize and inter-
pret the readings which will call for service or indicate the
beginn
ing of a malfunction. Before starting your Sullair
compressor, read this section thoroughly and familiarize
yourself with the controls and indicators—their purpose,
location and use.
4.2 Purpose of controls
Control or indicator Purpose
OFF/ON/START Switch (Start Up)
The engine switch is used to both energize the compressor’s electrical
system and engage the engine/starter. It also has a built-in anti-restart
device that protects the starter from engaging while the engine is run-
ning. The switch must be turned back to the “OFF” position before the
engine can be re-started.
Voltmeter
Monitors the condition of the batteries and the charging circuit. The nor-
mal reading is 24 to 48 volts.
Air Pressure Gauge
Continually monitors the pressure inside the receiver tank at various
load and unload conditions.
Engine Water Temperature Gauge
Monitors the temperature of the engine water. The normal operating
temperature should read approximately 160ºF to 210ºF (71ºC to 99ºC).
Compass Controller
Depicts system related diagnostics. Can be used for system perfor-
mance monitoring.
Compressor Discharge Tempera-
ture Gauge
Monitors the temperature of the air/fluid mixture leaving the compressor
unit. The normal reading should be approximately 210ºF to 250ºF (99ºC
to 121ºC).
System Pressure Sensor Prevents starter engagement when the air system is pressurized.
Fluid Level Sight Glass
Monitors the fluid level in the receiver tank. Proper level is always visible
in the sight glass. Check the level when the compressor is shutdown.
Receiver Tank Temperature Switch
Opens the electrical circuit to shut down the compressor when then
receiver tank temperature reaches 250ºF (121ºC).
Reducing Regulator Valve Provides regulated air pressure to the inlet valve.
NOTE
When restarting the compressor, the Compass
®
Controller will not allow restart until system pressure
falls below 10 psig (0.7 bar) or less. More than 10
psig (0.7 bar) can put extra load on the starter.
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