Thermo King Super II SR+, Manual

Page: 32 / 145

Operating Instructions (Rev 6/98)
22
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 prior warn-
ing.
NOTE: A buzzer sounds when the unit is automatically
preheating.
NOTE: A unit that is equipped with CYCLE-SENTRY
should be manually started if it has been turned off long
enough for the engine to become cold soaked at tempera-
tures below -1° C (30° F). Place the selector switch in the
CONTINUOUS position and refer to Manual Start. After
this initial cold start, the selector switch can be switched to
the CYCLE-SENTRY position. CYCLE-SENTRY sensors
will then automatically maintain temperatures and provide
reliable unit restarts on demand.
Fully charged batteries in good condition are essential for
reliable unit operation. This is especially true on CYCLE-
SENTRY units in cold weather.
1. Place the CYCLE-SENTRY selector switch in the
CYCLE-SENTRY position.
2. Place the On-Off switch in the ON position. The
CYCLE-SENTRY symbol should appear.
3. If the microprocessor calls for cooling or heating, the
cool or heat icon will appear and the glow plugs will
automatically preheat.
4. At the end of the preheat period, the engine will begin
cranking and should start and run. The glow plugs
remain energized during the cranking period.
NOTE: If the engine fails to start, the unit reset switch will
open, interrupting current to the control system 30-50 sec-
onds after the cranking cycle terminates.
5. If the engine fails to start, place the unit switch in the
OFF position, determine and correct the condition for
not starting., then push in the reset button and repeat the
starting procedure.
After Start Inspection
After the unit is running, the following items can be quickly
checked to confirm that the unit is running properly.
1. OIL PRESSURE. Check the engine oil pressure in high
speed by pressing the OIL PRESS key. The oil pressure
should be higher than 276 kPa (40 psi).
When first starting a cold engine, the oil pressure may
be higher.
2. AMMETER. The ammeter should indicate charge for a
short period of time after start up.
3. COMPRESSOR OIL. The compressor oil level should
be visible in the sight glass.
4. REFRIGERANT. The suction pressure should not drop
to zero unless the trailer temperature is very low, the
ambient temperature is low, or the modulation valve is
energized. The suction pressure will drop as the trailer
temperature drops, and if the ambient temperature is
low (See “Compound Pressure Gauge,” in Unit Instru-
ments). An initial drop in the suction pressure is nor-
mal. Allow the suction pressure to stabilize after
starting the unit.
5. OPERATING MODES. Run the unit through a Pre-
Trip to check the unit operations. See the appropriate
microprocessor operation manual for details.