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3
Alarm Menu (Figure 74)
Alarms are either Automatic Reset or Manual Reset. Automatic Reset Alarms are alarms that
allow the unit and/or circuit to return to operation once the operating parameter has been re
turned to acceptable operating conditions. The unit and/or circuit will restart automatically;
however, the red Alarm LED will remain illuminated until acknowledged to alert the operator the
alarm occurred. Manual Reset Alarms are alarms that stop the unit and/or circuit and do not
restart until the alarm is acknowledged and the alarm condition is reset manually on the alarm
screen. The red Alarm LED will stay illuminated until the alarm acknowledged AND the alarm
condition is reset.
The ALARM MENU can be accessed anytime by pressing the ALARM key. The main alarm
screen includes the instructions for viewing and resetting the alarms, as well as a means to
access the alarm history page. Pressing the ENTER key while viewing this alarm screen or the
active alarm will reset any alarm that has returned to its safe state. Any active alarm can be
viewed by pressing the DOWN key from this page. If no active alarms are shown, no alarms
are active. To view the Alarm History screen, press the ALARM key.
To return to the Home screen, press the Esc key.
3.1
Blower Motor Fault
This is a Manual Reset Alarm. The Blower Motor Fault is activated when the blower
motor overload device indicates an overloaded condition. In this state, the blower will
stop and not restart until the alarm condition is reset manually. Typically, the motor
starting hardware will need to be reset along with a control system reset. The red
Alarm LED on the display will stay lit until the alarm is reset.
3.2
Very Low Suction Pressure Alarm
This is a Manual Reset Alarm. The Very Low Suction Pressure Alarm is activated
when the suction pressure falls below 22.0 psig. This condition may indicate a leak in
the refrigerant circuit. The refrigerant circuit affected will stop and not restart until the
alarm condition is reset manually. The red Alarm LED on the display will stay lit until
the alarm is reset.
Figure 74
Desert Aire - CM3550 Manual
45
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