1-2
“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
Control System
The mounted and wired control system is U.L.
labeled. This control system provides automatic
lead/lag sequencing with circuit breaker
disconnects for each motor with external operators.
The control panel also includes full voltage motor
starters with overload protection, redundant 24V
DC control circuit power supplies, visual and
audible reserve unit alarm with isolated contacts
for remote alarm, and touch screen display.
Automatic alternation of compressors based on
a fi rst-on/fi rst-off principle with provisions for
simultaneous operation if required, visual and
audible alarm indication for high discharge air
temperature shutdown with isolated contacts for
remote alarm are included.
Final Line Filters and Regulators
Fully duplexed fi nal line fi lters rated for 1 micron
with element change indicators, along with
duplexed fi nal line regulators, are factory mounted
and piped.
Dew Point Hygrometer
The factory mounted, piped and wired, dew point
hygrometer includes remote alarm contact. The
dew point sensor is a ceramic type with system
accuracy of ± 2° F. The dew point alarm is factory
set at 36° F (2° C) per NFPA 99. High dew point
condition is indicated with visual and audible
alarm. Transmitters disconnected from control
system will activate an alarm. See Appendix A for
detailed information.
Air Receiver
The vertical air receiver is corrosion resistant,
ASME Coded, National Board Certifi ed, and rated
for a minimum 150 PSIG design pressure. The tank
piping includes a liquid level gauge glass, safety
relief valve, manual drain valve, and a zero loss
automatic solenoid drain valve.
1.0 General Information
