2-9 62-11863
Figure 2.8 Supra 950MT Serial Number Plate
The Supra 950MT is furnished with a microprocessor control system. (Refer to Section 3.1) Once the desired set
point is entered at the Cab Command in the truck, the unit will operate automatically to maintain the desired tem-
perature within very close limits. The control system automatically selects Loaded and Unloaded Cooling or
Loaded and Unloaded Heating as necessary to maintain the desired temperature.
The microprocessor has an Auto Start/Stop feature. The Auto Start/Stop operation provides automatic cycling of the
diesel engine, which in turn offers an energy efficient alternative to continuous operation of the engine. Temperatures
are maintained by alternate cooling and heating of the supply air (evaporator outlet air).
A remote standby receptacle is standard with all units.
2.2.3 Multi-Temperature Evaporators
The compartments of the Supra 950MT system are equipped with separate evaporators. For multi-temp applications,
single discharge and double discharge evaporators are available. The evaporators are different in size, capacity and
number of fans (See
Table 2–3
), but all work on the same principle and use the same single-phase 50Hz/60Hz fan
assembly. The electrical heaters vary according to the type of condensing unit used and number of compartments.
One or more of the following components are located inside the evaporator housing:
• 230V single-phase backward curved impeller supplying high air volumes at low noise levels and both expan-
sion and check valves
• 12V hot gas solenoid
• 12V liquid line solenoid
• 12V water drain heater
• Electrical heater element
• Sensor (Defrost Termination sensor)
• Safety heating thermostat
2.3 CONDENSING SECTION
The condensing section (See
Figure 2.1
,
Figure 2.2
and
Figure 2.3
) contains the drive equipment, alternator, and
the high side refrigeration system equipment. The engine radiator and refrigerant condenser are incorporated into a
single condenser/radiator assembly.
2.3.1 Drive Equipment
The drive equipment includes the engine, engine mounted clutch, air cleaner, muffler, coolant overflow bottle, drive
belts, and standby motor.
Fixed on
the frame
Fixed on
the micro
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