Thermo King T-1080S, Maintenance Manual

Page: 26 / 191

Unit Description
25
CargoLink™ (Optional)
CargoLink™ is a wireless sensor system. The
main components are the coordinator module,
interconnect harness, antenna, and wireless
sensors. The coordinator module receives
information from the wireless sensors through the
antenna, and communicates with the controller
through the interconnect harness. Currently, only
wireless door switches are available. Other
wireless sensors will be available in the future.
Refer to TK 55151 the Truck and Trailer Edition
CargoLink Installation Manual for information
about installing the CargoLink system and
sensors, and troubleshooting problems with the
system.
Electric Standby (Model 50
Units Only)
The Electric Standby option allows the unit to be
operated on either the diesel engine or external
electric power.
Standard Model 50 Features
The following features are standard equipment on
units equipped with Electric Standby.
Automatic Diesel/Electric Selection:
The unit will
automatically switch to electric operation when a
power cord is connected and the standby power is
switched On.
Overload Relay:
The overload relay is
self-resetting.
Hot Gas Heat:
Hot gas heat is utilized on all units.
Automatic Phase Correction:
The control system
features two motor contactors. This allows correct
motor rotation regardless of phase rotation on the
incoming power.
Optional Model 50 Features
The following features are available as options on
units equipped with Electric Standby.
• Electric Heater Strips
• Auto Switching
Engine Compartment
Components
Coolant Expansion Tank:
The coolant level and
temperature are monitored by the base controller.
If the coolant temperature becomes too high or the
level becomes too low, an alarm will occur.
The engine must have antifreeze protection to –30
F (–34 C). Check and add coolant in the
expansion tank as needed.
Engine Oil Dipstick:
Use the engine oil dipstick to
check the engine oil level.
Receiver Tank Sight Glass:
The receiver tank sight
glass is used to assist in checking the amount of
refrigerant in the system.
Compressor Oil Sight Glass:
The compressor oil
sight glass is used to check the relative level of
compressor oil in the compressor sump.
Unit Protection Devices
High Pressure Cutout Switch (HPCO):
This
normally closed switch monitors the discharge
pressure at the compressor. It opens on high
discharge pressure to shut the unit down to
prevent damage.
Electronic Throttling Valve (ETV):
This
component is an electromechanical control device
used to limit the suction pressure to the
compressor. The valve is controlled by the
microprocessor controller.
Engine Oil Pressure Switch/Sensor:
The engine
oil pressure switch/sensor is located on the filter
head above the bypass oil filter. Engine oil
pressure should rise immediately on starting. If
engine oil pressure drops below 10 ± 2 psig (69 ±
14 kPa), the switch/sensor signals the
microprocessor to stop the engine.
DANGER: High voltage AC power is present
whenever the unit is operating in the Electric
mode and whenever the unit is connected to
external standby power. Voltages of this
magnitude can be lethal. Exercise extreme
caution when working on the unit.
CAUTION: Do not remove expansion
tank cap while the coolant is hot.
CAUTION: Do not add Green or
Blue-Green coolants to cooling systems
that use Red Extended Life Coolants.