Operating Instructions (Rev 6/98)
18
If defrost is initiated manually, the unit will start and run on
low speed. When the defrost cycle is complete, the unit will
run in the operating mode called for by the microprocessor.
In cold ambients, the CYCLE-SENTRY system automati-
cally maintains engine temperature by restarting the unit if
the engine coolant temperature drops to -1° C (30° F).
When the unit starts up because of low engine coolant tem-
perature, the unit will run in whichever operating mode the
unit microprocessor calls for until the battery is fully
charged and the engine block temperature rises to 32° C
(90° F).
After the unit starts from microprocessor demand, defrost
initiation, battery voltage dropping below the CYCLE-
SENTRY Battery Voltage setting, or engine coolant temper-
ature demand; the CYCLE-SENTRY Amps feature will
keep the unit running until the battery is charged enough to
drop the charging current below the CYCLE-SENTRY
Amps setting. The unit runs in whichever operating mode
the microprocessor calls for to properly maintain the com-
partment temperature. When the battery is sufficiently
recharged, the unit will shut down on microprocessor
demand.
CAUTION: With the selector switch in CYCLE-
SENTRY position and the On-Off switch in the ON
position, the unit may start at any time without warning.
NOTE: A buzzer sounds when the unit is automatically
preheating.
Fully charged batteries in good condition are essential for
reliable unit operation. This is especially true on CYCLE-
SENTRY units in cold weather.
UNIT INSTRUMENTS
1.
AMMETER. The ammeter is built into the micropro-
cessor. It indicates the battery charge and discharge
amperage during unit operation. The charging amper-
age varies according to the needs of the battery. The
ammeter also indicates the amount of current draw by
the glow plugs during preheat.
2.
MICROPROCESSOR LCD DISPLAY. The LCD dis-
play normally shows the setpoint, the return air temper-
ature, and any active icons, which are:
•
Cool
•
Heat
•
Defrost
•
CYCLE-SENTRY
•
High Speed
•
In-range
•
Modulation
Pressing the SELECT key causes the display to show
the other sensor readings. Pressing the CODE key
causes the display to show the fault codes.
3.
ALARM ICON. The alarm icon comes on whenever
there is an alarm code stored in the microprocessor
memory.
4.
RECEIVER TANK SIGHT GLASS. The receiver
tank sight glass is used to check the amount of refriger-
ant in the system, and the moisture content of the
refrigerant.
5.
COMPRESSOR OIL SIGHT GLASS. The compressor
oil sight glass is used to check the relative level of com-
pressor oil in the compressor sump.
6.
AIR RESTRICTION INDICATOR. An air restriction
indicator is attached to the intake manifold. Visually
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