Operating Instructions (Rev 1/99)
26
3. Adjust the thermostat to the proper setting.
NOTE: The power cord indicator will come on if the
unit is connected to an electric standby power supply.
Electric Standby Operation
1. Connect the electric standby power supply to the unit’s
power receptacle. Make sure that the power supply has
the proper voltage and phasing.
2. Press the On-Off Key in the cab control box to turn the
unit ON.
3. Adjust the thermostat to the proper setting.
NOTE: The power cord indicator will come on while
the unit is connected to an electric standby power
supply.
Adjusting the Thermostat
The thermometer reading (return air sensor temperature)
normally appears on the digital display while the unit is
turned ON. Pressing the Setpoint Key causes the thermostat
setpoint to appear on the display for 10 to 15 seconds.
1. Press the Setpoint Key to display the setpoint. The set-
point will appear on the display for 10 to 15 seconds.
2. Turn the Thermostat Dial to adjust the setpoint to the
proper setting while the setpoint is being displayed.
3. After the thermometer reading appears on the display,
press the Setpoint Key to check the setpoint.
NOTE: The Thermostat Dial will change the setpoint
without pressing the Setpoint Key. Do not turn the
Thermostat Dial without checking the setpoint.
After Start Inspection
1. THERMOSTAT. Adjust the thermostat setting above
and below the box temperature to check the thermostat
operation (see Operating Modes).
2. PRECOOLING. With the thermostat set at the correct
temperature, allow the unit to run for one-half to one
hour (longer if possible) before loading the truck. Pre-
cooling will remove residual body heat and moisture
from the box interior and provide a good test of the
refrigeration system.
3. DEFROST. When the unit has finished pre-cooling the
truck interior (the evaporator temperature has dropped
below 42 F (5.6 C), initiate a defrost cycle with the
Manual Defrost switch. The defrost cycle should end
automatically.
Loading Procedure
1. Make sure that the unit is OFF before opening the doors
to minimize frost accumulation on the evaporator coil
and heat gain in the truck. (The unit may be running
when the truck is being loaded from a warehouse with
door seals.)
2. Spot check and record the load temperature while load-
ing. Especially note any off-temperature product.
3. Load the product so there is adequate space for air cir-
culation completely around the load. DO NOT block
the evaporator inlet or outlet.
4. Products should be precooled before loading. Thermo
King units are designed to maintain loads at the temper-
ature at which they are loaded. Transport refrigeration
units are not designed to pull hot loads down to temper-
ature.
Post Loading Procedure
1. Make sure that all the doors are closed and locked.
2. Adjust the thermostat to the desired temperature set-
point.
3. Start the unit.
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