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Section 5
COMPRESSOR SYSTEMS
Figure 5-5 Air Inlet System
pressure valve now isolates the sump vessel from
the service line.
22
If the Supervisor II module is operating on an "I"
mode, the unit runs unloaded until the line pressure
falls below 100 psig (6.9 bar), at which point it pro-
ceeds to the Normal Modulating Mode. If on the oth-
er hand, the Supervisor II module is operating in the
"A" mode, the unit runs unloaded for a pre--set
length of time, and unless the line pressure falls be-
low the 100 psig (6.9 bar) level, it stops at the end of
this period. Once the line pressure falls below the
100 psig (6.9 bar) level, the compressor automati-
cally restarts, followed by package operation in the
Load mode.
When the line pressure drops back to 100 psig (6.9
bar) due to an increase in the air demand, Supervi-
sor II energizes the solenoid valve allowing the air
pressure behind the inlet poppet valve to be vented
through the solenoid valve exhaust port. The blow-
down valve closes, and the inlet poppet valve
opens. Also the air pressure at the spiral valve ac-
tuator diaphragm is reduced through a vent hole at
the spiral valve differential pressure regulator, and a
spring in the actuator causes the spiral valve to re-
turn to the full load (maximum) position.
5.7 AIR
INLET
SYSTEM,
SCRIPTION
Ref er t o
F igure 5 --
5. T he compressor inlet syst em
consists of a single- -stage, dry- -type air filter, an
inlet poppet valve, and an adaptor piece which
mounts both devices to the compressor inlet flange.
Optionally, a two--stage, heavy--duty, dry--type filter
with inertial dust separation and collection, is avail-
able for added air filtration and sound attenuation.
When the pressure drop across the filter element(s)
exceeds a level of 15 in. of water column, a switch
contact opens in the Supervisor II module and a filter
maintenance annunciation is displayed.
FUNCTIONAL
DE-
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