Microprocessor Controller for DOAS 7
®
Alarms
The microprocessor controller includes a digital output
for remote indication of an alarm condition, which
connects via the J15 port. Possible alarms include:
• Dirty Filter Alarm: If the outside air or return air
filter differential pressure rises above the differential
pressure switch setpoint, the microprocessor
controller will activate an alarm.
• Supply and Exhaust Air Proving Alarm:
Microprocessor controller monitors proving switch on
each blower and displays an alarm in case of blower
failure.
• Sensor Alarm: Microprocessor controller will send
an alarm if a failed sensor is detected (temperature,
pressure, relative humidity).
• Supply Air Low Limit: If the supply air temperature
drops below the supply air low limit (35°F), the
microprocessor controller will de-energize the unit
and activate the alarm output after a preset time
delay (300s).
• Other Alarms: Wheel Rotation, High Wheel
Pressure, High/Low Refrigerant Pressure.
Sequence of Operation
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