energy required to re pressurize the reservoir. It also
eliminates the problems of oil foaming and carryover
that can occur if the oil reservoir of an oil-flooded com-
pressor is blown down too often. The timer is adjust-
able from 5 to 20 minutes.
Automatic Mode Operation - This mode provides
automatic start and timed stop, and is best used in ap-
plications with long unloaded periods and adequate
storage to allow stopping the compressor for periods.
Operation during periods of moderate to heavy de-
mands is identical to the low demand mode described
above.
The automatic time delay is adjustable from 5 to 20
minutes. Ifthe controller operates unloaded for this pe-
riod with no demand, the compressor drive motor is
halted to eliminate its power consumption. The con-
trols will remain in this state until demand is again indi-
cated by a drop in pressure.
Sequence Mode Operation - This mode provides for
communication between controllers, operating only as
many as are required for economical operation. Use
this on applications with large storage capacity and di-
verse loads. The lead unit will operate identically to the
automatic mode; operation will be automatically staged
for each lag unit (up to 8 total). For more information,
refer to the sequencing instructions later inthis chapter.
Communication between controllers is achieved by in-
terconnection of a communication cable to circuit board
connectors. A “unit number” must be assigned to each
unit in this mode, but the display will indicate the unit’s
actual operating ranking.
AUTO-SENTRY@ -ES CONTROL DISPLAY
The display above the keypad is used to provide oper-
ating information to the user.
During normal operation, the display will show the sys-
tem pressure, compressor discharge temperature, to-
tal running hours, and operation mode. If one of the op-
erating modes has been selected, the green “RUN”
indicator will be lit.
Alternate displays are available by pressing keypad
cursor keys, and will be identified on the display. These
include system pressure, reservoir pressure, separator
differential pressure, total hours, compressor dis-
charge temperature, and reservoir temperature. In
Low Demand, Automatic, and Sequence modes, alter-
nate displays also include the appropriate remaining
FIGURE 4-1 - AUTO SENTRY -ES DISPLAY
13-9/10-841 Page 19
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