Thermo King 002008, Manual

Page: 20 / 155

Unit Description
20
The engine is connected directly to the
compressor on Model 30 units. A centrifugal
clutch transfers power from the engine to the
compressor on the Model 50. The centrifugal
clutch engages when the engine reaches 400 ± 100
rpm. Belts are used to transfer power to the fans
and the alternator.
During electric standby operation (Model 50 units
only) the centrifugal clutch isolates the engine
from the compressor. The electric motor drives
the compressor, the fans, and the alternator
through belts.
Thermo King X430L Compressor
The unit is equipped with a Thermo King X430L,
four-cylinder compressor with 30 cu. in.
(492 cm
3
) displacement. The unit is also equipped
with a compressor oil filter.
Units built before mid-February 2003 are
equipped with compressors that have a 4-quart
sump. Units built after mid-February 2003 are
equipped with compressors that have a 7-quart
sump. See “Compressor Sump Sizes” on page 81.
Smart Reefer Multi-Temp µP-IV
Microprocessor
The Smart Reefer Multi-Temp µP-IV is a
microprocessor control system designed for a
Smart Reefer Multi-Temp transport refrigeration
system. The Smart Reefer Multi-Temp µP-IV
integrates the following functions: thermostats,
digital thermometers, hourmeters, oil pressure
gauge, water temperature gauge, ammeter,
voltmeter, tachometer, mode indicator,
refrigeration system controller, and diagnostic
system.
The CYCLE-SENTRY system and integral
defrost timers are standard features. DAS and a
remote control box are optional features.
The microprocessor mounts inside a weather tight
control box. The display is clearly visible through
a transparent cover. Opening the keypad door
provides quick access to the microprocessor
keypad. The keypad is used to control the
operation of the microprocessor.
CYCLE-SENTRY Start-Stop Controls
A CYCLE-SENTRY Start/Stop fuel saving
system provides optimum operating economy.
NOTE: A buzzer sounds when the unit is
automatically preheating.
The CYCLE-SENTRY system automatically
starts the unit on microprocessor demand, and
shuts down the unit when all demands are
satisfied. In addition to maintaining the
compartment temperatures, engine block
temperature and battery charge levels are
monitored and maintained. If the block
temperature falls below 30 F (-1 C), the engine
will start and run until the block temperature is
above 90 F (32 C). If the battery voltage falls to
the programmed limit selected by
CYCLE-SENTRY Battery Voltage (typically
12.2 volts) and Diesel CYCLE-SENTRY mode is
selected, the engine will start and run until the
charge rate falls below that programmed by
CYCLE-SENTRY Amps (typically 5 amperes).
Features of the CYCLE-SENTRY system are:
• Offers either CYCLE-SENTRY or
Continuous Run operation.
• Microprocessor controlled all season
temperature control.
• Maintains minimum engine temperature in
low ambient conditions.
• Battery Sentry
TM
keeps batteries fully charged
during unit operation.
• Variable preheat time.
• Preheat indicator buzzer.
WARNING: When the Zone 1/Host
On/Off switch is in the On position, the
unit may start at anytime without prior
warning.