30
Fig. 29 — CADM Housing/LED Locations
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 code. The ALERT LED will blink a num-
ber of times consecutively, pause and the repeat the process. The
number of blinks, defined in Table 19, correlates to a particular ab-
normal 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 al-
low the system to restart normally. Manual reset requires that main
power to the 38AU 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 oc-
cur when the CADM detects a thermostat demand at input Y but
there is no power at the compressor line terminals T1 or T2 or T3.
This lockout can occur due to a safety switch (LPS or HPS) open-
ing and de-energizing the 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 condi-
tion 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.
Fig. 30 — 38AUD Size 16 Cabinet
Power
(GRN)
Alert
(YEL)
Trip
(RED)
POWER
ALERT
TRIP
Commercial Diagnostics
Comfort Alert
™
Green LED - 24VAC Power
Yellow LED - Flash Code
2 System Pressure Trip
3 Short Cycling
4 Locked Rotor
5 Open Circuit
6 Missing Phase
7 Reverse Phase
8 Welded Contactor
9 Low Voltage
Red LED - Protector Open
or no compressor power
Active Protection
PROT breaks 24VAC common
leg of compressor contactor coil
Reset codes and PROT lockout
by removing 24VAC to module
For Two-Stage Applications:
DC SOL operating range: 4-18VAC
Compressor second stage is
energized when YA & Y2 are 24VAC
and Alert and Trip LEDs are off
EMERSON
™
Climate Technologies
T1
T2
T3
Condenser Fans/Motors
Service
Valves
Access Panel -
Control Box and
Compressors
Outdoor
Fan 1
Outdoor
Fan 2
Outdoor
Fan 3
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