22
1/2-20 UNF RH
30°
0.596
.47
5/8” HEX
SEAT
CORE
WASHER
DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
O-RING
45°
1/2" HEX
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
(Part No. EC39EZ067)
C08453
Fig. 21 -- CoreMax Access Port Assembly
Comfort Alert Diagnostic Module
The Comfort Alert Diagnostic Module (CADM) monitors
and analyzes data from the Copeland Scroll three-p h as e
compressor and the thermostat demand. The CADM also
prov id es a 3-minu te anti-r ecy cle time delay to compress o r
cycling. Each compressor has a separate CADM module.
The CADM detects causes for electrical and system
related failure s without any sensors. Flashing LEDs
communicate the Alert codes to guide service t echnicians
in accurately and quickly troubleshooting the system and
determining root cause for the failure.
Inputs to the CADM include 24-vac power, thermostat Y1
or Y2, compressor contactor coi l (common side) and
compressor power leads (from the compressor contactor).
Input Ter mi n a l Voltage
Control
Power
R 24-V
Control
Common
C 24-V
Cooling Y 24-V
Contactor
Coil
P 24-V
Line A T1 Line
Line B T2 Line
Line C T3 Line
Control of the compressor contactor coil i s through a
normally-closed (power on the module) contact bet we en
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. 22): POWER (green), ALERT (yellow), and
TRIP (red).
The POWER LED indicates the presence of control power
to the CADM.
The ALERT LED indicates an abnormal condition exists
in the system through a flash c ode. The ALERT LED will
blink a number of times consecutively, pause and the
repea t the process. The number of blinks, defined in
Table 8, c orrelates 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 requi res that main power to the
38AU unit be recycled after the cause for the Alert
condition has been detected and corrected.
POWER
(GRN)
ALERT
(YEL)
TRIP
(RED)
C10086
Fig. 22 -- CADM Housing/LED Locations
The TRIP LED indicates either a time-delay period is
current ly active (RED LED is blinking) or the module has
locke d out the compressor (RED LED is on steady). A
lockout condition will occur when the CADM detects a
thermostat demand at input Y but there is no power a t the
compressor line term inals T1 or T2 or T3. This lockout
can occur due to a safety switch (LPS or HPS) opening
and de-energizing t he compressor contactor, the
compressor-motor internal overload opens, or other
internal power interruption has occurred. 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 wiri ng.
Troubleshooting the CADM Wiring – Flashing LEDs also
indicate wiring problems to the CADM. See Table 9 for
discussion of addit ional LED flash codes and
troubleshooting instructions.
38AU
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