SERVICE

Comfort Alert Diagnostic Module

The Comfort Alert Diagnostic Module (CADM) monitors and analyzes data from the Copeland Scroll® three-phase compres- sor 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 without any sensors. 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, thermostat Y1, compressor contactor coil (common side) and compressor power leads (from the compressor contactor).

Input

Terminal

Voltage

Control

R

24-V

Power

 

 

Control

C

24-V

Common

 

 

Cooling

Y

24-V

Contactor

P

24-V

Coil

 

 

Line A

T1

Line

Line B

T2

Line

Line C

T3

Line

Control of the compressor contactor coil is through a normally-closed (power on the module) 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. 21): 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)

Fig. 21 — 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 6, 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 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 occur 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) opening 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 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 7 for discussion of additional LED flash codes and troubleshooting instructions.

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Carrier 38AUZ appendix Service, Comfort Alert Diagnostic Module, Input
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38AUZ specifications

The Carrier 38AUZ series is a line of air conditioning systems specifically designed to deliver optimal comfort and energy efficiency for both residential and commercial applications. Known for their advanced technology and robust performance, these units are ideal for a variety of climate conditions, ensuring consistent cooling and heating throughout the year.

One of the standout features of the Carrier 38AUZ series is its inverter technology, which allows the unit to adjust its cooling or heating output in real-time based on the ambient conditions. This results in lower energy consumption and reduced operating costs, making the system not only environmentally friendly but also budget-conscious. By minimizing temperature fluctuations, the inverter design promotes a more stable and comfortable indoor environment.

The 38AUZ units are equipped with high-efficiency compressors that enhance the system’s performance. These compressors operate quietly and efficiently, contributing to a lower noise level that is ideal for residential settings. Furthermore, they come with variable speed fan motors which offer precise airflow control, allowing users to customize their comfort level while ensuring energy savings.

In terms of build quality, the Carrier 38AUZ is constructed using durable materials designed to withstand harsh weather conditions. Its compact design allows for easy installation and maintenance, making it an ideal choice for urban environments where space is limited. Additionally, the system features a corrosion-resistant cabinet that extends its lifespan and maintains aesthetic appeal.

The 38AUZ series also includes a range of advanced control options. Users can benefit from smart technology integration, allowing for remote temperature control and scheduling through mobile devices. This feature not only enhances convenience but also provides users with complete control over their energy usage.

Moreover, the Carrier 38AUZ units come with various capacity options, catering to different space requirements. With a focus on energy efficiency, these systems often meet or exceed industry standards, including SEER ratings, ensuring optimal performance without sacrificing energy consumption.

In summary, the Carrier 38AUZ series is an exemplary choice for anyone looking to invest in a reliable, efficient, and advanced air conditioning system. With its inverter technology, high-efficiency compressors, smart control options, and durable construction, the 38AUZ not only delivers exceptional comfort but also promotes energy conservation, making it a smart choice for sustainable living.
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