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COMFORT ALERT DIAGNOSTIC
MODULE
The Comfort Alert Diagnostic Module (CADM) monitors
and analyzes data from the Copeland Scroll three-phase
compressor and the thermostat demand. The CADM also
provides a 3-minute anti-recycle time delay to compressor
cycling.
The CADM detects causes for electrical and system
related failures. Flashing LEDs communicate the Alert
codes to guide service technicians in accurately and
quickly troubleshooting the system and determining root
cause for the failure.
Inputs to the CADM include 24-vac power, demand signal
Y, Y2, compressor contactor coil (common side) and
compressor power leads (from the compressor contactor).
Input
Control Power
Control Common
Demand
Demand*
Contactor Coil
Compressor T1
Compressor T2
Compressor T3
*
NOTE: Applies to 38AUQ(D,E)07 only
Control of the compressor contactor coil is through a
contact between terminals P and C.
Communications of status and alert conditions is through
three LEDs located on the top edge of the module housing
(see Fig. 36): POWER (green), ALERT (yellow), and
TRIP (red).
The POWER LED indicates the presence of control power
to the CADM.
Terminal
Voltage
R
24-V
C
24-V
Y
24-V
Y2
24-V
P
24-V
T1
Line
T2
Line
T3
Line
POWER
(GRN)
ALERT
(YEL)
TRIP
(RED)
Fig. 36 - - CADM Housing/LED Locations
The ALERT LED indicates an abnormal condition exists
in the system through a flash code. The ALERT LED will
blink a number of times consecutively, pause and the
repeat the process. The number of blinks, defined in
Table 10, correlates to a particular abnormal condition;
troubleshooting tips are provided for each Alert code.
Reset of the ALERT may be automatic or manual. If the
fault condition causing the Alert is self-corrected, the
Alert code will be removed and the CADM will
automatically reset and allow the system to restart
normally. Manual reset for lockouts requires that main
power to the 38AUQ unit be recycled after the cause for
the Alert condition has been detected and corrected.
The TRIP LED indicates either a time-delay period is
currently active (RED LED is blinking) or the module has
locked out the compressor (RED LED is on steady). A
lockout condition will occur for some faults as identified
in Table 11. Reset of the TRIP LED requires that unit
main power be recycled after the loss of power to the
compressor condition has been detected and corrected.
Simultaneous Blinking of YELLOW and RED LEDs
indicates control power input to the CADM is low. Check
control circuit transformer and wiring.
Troubleshooting the CADM Wiring – Flashing LEDs also
indicate wiring problems to the CADM. See Table 12 for
discussion
of
additional
troubleshooting instructions.
40
C10086
LED
flash
codes
and
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