CACG/CAHG & CACH/CAHH
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
48
P/N 240008108, Rev. B [082509]
CACH/CAHH Controller Fault Conditions
CACH/CAHH microprocessor controller fault indications
Table 8
Timer/Alarm
LED — number
of flashes:
Fault condi-
tion
Description
1
Room air sen-
sor fault
If the room air sensor is disconnected, damaged or mal-
functions the Timer/Alarm LED will flash one (1) time to
signify that a fault has occurred. Operation of heating and
cooling will stop. The fan will continue to operate.
2
Condensate
fault
If the control senses a condensate fault condition, either
through the condensate pumps safety switch or the drain
pan sensors, the Timer/Alarm LED will flash two (2)
times to signify that a fault has occurred. The compressor
will switch off for a minimum of three (3) minutes AND
until the fault condition is corrected. After that, as long as
the thermostat is calling for cooling the compressor will
restart.
3
ID coil sensor
fault
The indoor coil sensor monitors the temperature of the
indoor coil. If a freeze condition is detected continuously
for three (3) minutes, the Timer/Alarm LED will flash
three (3) times to signify that a fault has occurred. The
compressor will switch off for a minimum of three (3)
minutes AND until the fault condition is corrected. Also,
if the microprocessor detects an evaporator freeze condi-
tion four (4) times within a 24 hour period, the clean filter
indicator will appear.
4
Clean filter
To aid in filter maintenance, the cassette controller will
indicate when a schedule filter cleaning is required by flash-
ing the Timer/Alarm LED. During normal operation the
microprocessor will keep track of the unit’s run time. When
the clean filter time has elapsed, the Timer/Alarm LED will
flash four (4) times to indicate that the filter needs to be
cleaned. The clean filter time is selectable through the Con-
figuration mode. Available settings are 250, 500, 750, 1000,
and 1250 hours. For Remote Thermostat mode, the default
time is 1000 hrs. This cannot be changed. If an evaporator
freeze condition is detected four (4) times within a 24 hour
period, the Clean Filter Alarm will appear.
After filter maintenance has been performed, press the
Clear Filter Warning Button for three (3) seconds. The
control will respond with a beep to indicate that the timer
has been reset.
5
Test mode
See Table 6, Page 32 for information.
