26
MODINE CONTROLS SYSTEM MANUAL
ClassMate and SchoolMate Models
AIR74-525.1
Unit Alarms
Alarm
Auto
Reset
Unit
Disabled
Component
Disabled
Cause Action
Clock board fault or not connected
Indicated an error with the
real time clock on-board the
controller. During alarm any
time zones set up is ignored
Once the clock is functioning correctly, the
alarm will be automatically reset and any
time zones settings will be restored.
Extended memory
Controller memory fault Alarm is generated- No other action taken
Run Hours
Run Hours exceed
Maintenance hours
Alarm is generated- No other action taken
Return Air Temperature Sensor
Failure
Return Air sensor faulty or
not connected
Alarm is generated- No other action taken
Inside Coil Temperature Sensor
Failure
Inside Coil sensor faulty or
not connected
Alarm is generated- No other action taken
Outside Coil Temperature Sensor
Failure
Outside Coil sensor faulty or
not connected
Alarm is generated- No other action taken
Supply Temperature Sensor
Failure
Supply Air sensor faulty or
not connected
Alarm is generated- No other action taken
CO2 sensor Failure
CO2 sensor faulty or not
connected
Alarm is generated- No other action taken
Outside Air Humidity Sensor
Failure
Outside Air sensor faulty or
not connected
Alarm is generated- No other action taken
Return Air Humidity Sensor
Failure
Return Air sensor faulty or
not connected
Alarm is generated- No other action taken
Outside Air Temperature Sensor
Failure
Outside Air sensor faulty or
not connected
Alarm is generated- No other action taken
Liquid Line Pressure Sensor
Failure
Liquid Line Pressure sensor
faulty or not connected
Alarm is generated- No other action taken
pCOe Off-line
The pCOe is not connected
or incorrectly setup and is
not communicating to the
pCOOEM+
Alarm Generated- Supplemental Electric
heat is locked out
pAD Temperature Failure
pAD Temperature sensor
faulty or not connected
Alarm is generated- No other action taken
pAD Humidity Failure
pAD Humidity sensor faulty
or not connected
Alarm is generated- No other action taken
pAD Off-line
pAD is faulty or not
connected
Alarm is generated- No other action taken
Low Pressure (compressor)
Compressor low pressure
sensor has tripped
Compressor turned off, after three
attempts alarm is generated
High Pressure (compressor)
Compressor high pressure
sensor has tripped
Compressor turned off, after three
attempts alarm is generated
Condensate Pan
The main drain pan is not
draining
This input generates an alarm after
a 10 second delay and locks out the
compressor
Freeze Condition
Air Temperature over
Hotwater or Steam coils
drops below 35˚F
Alarm is generated after three attempts
then the Unit is in shutdown and the hot
water/steam and baseboard valves shall
open
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