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PN 20009722 REV F, [08/01/2020]
CAW INFRARED CONTROL SYSTEM - OPERATION
Table 5 - Microprocessor Controller Fault Indications For Infrared Control System
Timer/Alarm
LED — number
of flashes:
Fault Condition
Description
1
Room Air Sensor Fault
If room air sensor is disconnected, damaged or malfunctions Timer/
Alarm LED will flash one (1) time to signify that fault has occurred.
Operation of heating and cooling stop. Fan will continue to operate.
2
Condensate Fault
If control senses condensate fault condition, either through
condensate pumps safety switch or drain pan sensors, Timer/Alarm
LED flashes two (2) times to signify fault has occurred.
Cooling switches off for minimum of three (3) minutes AND fault
condition is corrected. After, as long as the thermostat is calling for
cooling the water valve will open and cooling starts.
3
ID Coil Sensor Fault
Indoor coil sensor monitors temperature of indoor coil. If freeze
condition is detected continuously for three (3) minutes, Timer/Alarm
LED flashes three (3) times to signify fault has occurred.
Cooling switches off for minimum of three (3) minutes AND fault
condition is corrected.
If microprocessor detects coil freeze condition four (4) times within
24 hour period, clean filter indicator appears.
4
Clean Filter
To aid in filter maintenance, cassette controller indicates when
schedule filter cleaning is required by flashing Timer/Alarm LED.
During normal operation microprocessor will keep track of unit’s run
time.
When clean filter time has elapsed, Timer/Alarm LED flashes four (4)
times to indicate filter needs to be cleaned. Clean filter time is can be
selected through Configuration mode. Available settings are 250, 500,
750, 1000, and 1250 hours.
In wall mounted thermostat mode, default time is 1000 hrs. This
cannot be changed. If coil freeze condition is detected four (4) times
within 24 hour period, Clean Filter Alarm will appear.
After filter maintenance has been performed, press Clear Filter
Warning Button for three (3) seconds. Control responds with beep to
indicate timer has been reset.
5
Test Mode
See Table 3, Page 25 for information.
Auxiliary Freeze Protection for Chilled Water and Hot Water Coils.
CAW units are equipped with a secondary capillary type freeze sensor to guard against coil freeze up due to sub-freezing
ducted fresh air or cold room ambient conditions.
The sensor is mounted on the supply side of the outer most coil of the CAW unit. Depending on the model selected the
freeze sensor will either switch off the fan or energize heating mode should a freeze condition be detected. Once the
freeze condition is alleviated the sensor will reset and the CAW unit will return to normal operation.
