38
506 01 2303 01
Specifications are subject to change without notice.
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, compressor contactor coil (common side) and
compressor power leads (from the compressor contactor).
Input
Terminal
Voltage
Control Power
R
24-V
Demand*
Y2
24-V
Control Common
C
24-V
Demand
Y
24-V
Contactor Coil
P
24-V
Compressor T1
T1
Line
Compressor T2
T2
Line
Compressor T3
T3
Line
*
NOTE:Applies to CHS072*07G/H 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. 35): POWER (green), ALERT (yellow), and
TRIP (red).
The POWER LED indicates the presence of control power
to the CADM.
POWER
(GRN)
ALERT
(YEL)
TRIP
(RED)
C10086
Fig. 35 -- 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 11, 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 CHS 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
LED flash
codes and
troubleshooting instructions.
