Section 6
COMPRESSOR OPERATION
23
6.1 GENERAL
While Sullair has built into the DR --- 13 compressor
package a comprehensive array of controls and in-
dicators to help assure proper operation, the user
should recognize and interpret readings which call
for service or indicate the onset of a malfunction.
Before starting the unit, the user should become fa-
miliar with the controls and indicators --- their pur-
pose, location, and use.
WARNING
!
The minimum continuous operating pressure is
70 psig (4.8 bar). the compressor should not be
operated below this pressure except for short pe-
riods. The Supervisor II will shut the machine
down if it is operated continuously below 5 0 psig
(3.4 bar) for five minutes.
6.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushing in this switch, found adjacent to the Supervisor
II, cuts all AC outputs from the latter and de---energizes
the starter. A fault message (E STOP) is displayed by
the Supervisor II until the button is pulled out and the
“O” pad is pressed.
MOTOR O/L RESET Momentarily pushing t his button, found on the thermal
overload element housing in the starter box, re---closes
the latter’s contacts after a current overload takes place.
Please be aware that the elements must be allowed to
cool sufficiently before resetting.
LIMIT SWITCH Operates blowdown valve.
DISCHARGE CHECK VALVE Isolates compressor from field pipework w hen shut
down. Located between the HPsilencer and the after-
cooler.
PRESS RELIEF VALVES Found on the discharge pipework of both LP and HP
stages, t hey vent the compressed air to atmosphere in
case of an over pressure condition --- 65 and 165 psi
(4.5 and 11.4 bar), respectively.
INLET VALVE CYLINDER AND CONTROL VALVE
ASSEMBLY The hydraulically operated butterfly valve throttles the
air flow entering the unit inlet flange --- LP stage. A
4--- way electric solenoid valve loads and unloads the hy-
draulic actuator, in response to Supervisor II com-
mands.
BLOWDOWN VALVES The 2---way valve vents compressed air (HP discharge)
to atmosphere through a muffler.
DRAIN GLOBE VALVES Furnished as manual backups to automatic drain valves
used in the condensate separator vessels. Also used as
lubricant sump drain valve.
OIL PRESSURE BYPASS VALVE To maintain desired oil flow and to protect oil pump from
over pressure situations.
THERMAL VALVE This thermal valve automatically opens/closes to by-
pass warm oil around the heat exchanger to ensure fast
oil warmup and optimize operating temperature.
SUMP SIGHT GLASS Indicates level of lubricant in the sump. Located on the
sump side, it should show 75% full (compressor
stopped) for proper oil level.
To Next Page
Loading...
