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13. Manual Defrost
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1. With the system powered up (START/RUN-OFF switch in the START/RUN
position) press the MANUAL DEFROST key.
2. If the conditions for defrost are met, the status bar and the Box
Temperature display will change to the word "DEFROST". The
MessageCenter will display "DEFROST CYCLE STARTED" for 10
seconds. At the completion of any defrost cycle, the MessageCenter will
return to the default display.
3. If the conditions for defrost are not met, the MessageCenter will display
"CANNOT START DEFROST CYCLE" for five seconds. This message will
be activated when:
• The box temperature is too warm. Defrost may be entered when the
defrost termination temperature sensor is below 40°F (4.4°C) or the
supply air temperature sensor is below 45°F (7.2°C) OR
• The unit is in Pretrip OR
• There is an active shutdown alarm.
Defrost may also be initiated automatically at preset intervals by the system
defrost timer or by the defrost air switch.
START/STOP ELECTRIC
DEFROST
DEFROST CYCLE STARTED
23
DEFROST
25
o
SETPOINT
F
62-11784
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