Allied Air Enterprises 4AC16LT manual Operation, LED Description, Interpreting the Diagnostic LEDs

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OPERATION

Outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is moved to the ON position, the indoor blower operates continuously.

System Diagnostic Module

4AC16LT units contain a diagnostic module for trouble- shooting air conditioning system failures. By monitoring and analyzing data from the compressor and thermostat demand, the module can accurately detect the cause of electrical and system related failure without any sensors. If a system problem occurs, a flashing LED indicator communicates the failure code.

LED Description

POWER LED (Green) indicates voltage is present at the power connection of the module.

ALERT LED (Yellow) communicates an abnormal system condition through a unique flash code. The ALERT LED will flash a number of times consecutively, pause, and then repeat the process. The number of consecutive flashes correlates to a particular abnormal condition.

TRIP LED (Red) indicates there is a demand signal from the thermostat but no current to the compressor is de- tected by the module. The TRIP LED typically indicates the compressor protector is open or may indicate missing supply power to the compressor.

Interpreting the Diagnostic LEDs

When an abnormal system condition occurs, the diagnostic module displays the appropriate ALERT and/or TRIP LED. The yellow ALERT LED will flash a number of times consecutively, pause, and then repeat the process. To identify a flash code number, count the number of consecu- tive flashes. Refer to Table 9 on page 17 and Table 10 on page 18 for information on the flash codes.

Every time the module powers up, the last ALERT LED flash code that occurred prior to shutdown is displayed for 60 seconds. The module will continue to display the previous flash code until the condition returns to normal or 24VAC is removed from the module. TRIP and ALERT LEDs flashing at the same time means control circuit voltage is too low for operation.

24VAC Power Wiring

The diagnostic module requires a constant nominal 24VAC power supply. The wiring to the module’s R and C terminals must be directly from the indoor unit or thermostat.

Thermostat Demand Wiring

The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, labeled Y on the module, should always be con- nected to the compressor contactor coil so that when the coil is energized, the demand signal input is 24VAC. When the coil is not energized, the demand signal input should be less than 0.5VAC.

Miswired Module Codes

Depending on the system configuration, some ALERT flash codes may not be active. The presence of safety switches affects how the system alerts are displayed by the module.

Miswiring the diagnostic module will cause false LED codes. Table 11 on page 19 describes LED operation when the module is miswired and what troubleshooting action is required to correct the problem.

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Issue 1008

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Contents 4AC16LT Series Lennox International Inc. CompanyInstallation Installation ClearancesTorque Table Slab MountingElectrical Wiring Slab MountingThermostat Designations Refrigerant PipingPlacement Installing Refrigerant LineLine Set Isolation Refrigerant Line Sets Installing Horizontal Runs Outside Unit Placement InstallationRefrigerant Metering Device on Refrigerant Line Sets Transition from Vertical to Horizontal Flushing Connections Flushing Existing Line Set and Indoor CoilRefrigerant Metering Device TXV DataLiquid and Suction Line Service Valves To Access the Schrader PortTo Close Liquid or Suction Line Service Valve Suction Line Ball Type Service ValveBall Type Service Valve Valve Open Leak TestingUsing an Electronic Leak Detector EvacuationPage START-UP Refrigerant Charge AdjustmentRefrigerant Charging Charge Using Weigh-In Method Blocking Outdoor CoilSubcooling Values R410A Temperature/Pressure ChartApproach Values for TXV Systems Issue Interpreting the Diagnostic LEDs 24VAC Power WiringThermostat Demand Wiring OperationFlash Codes LEDFault Description Troubleshooting Information Status Miswired Module Troubleshooting Sensing holesIndoor Coil MaintenanceIndoor Unit Start-Up and Performance Checklist Wiring Diagram P/N

4AC16LT specifications

The Allied Air Enterprises 4AC16LT is a highly efficient air conditioning unit designed to provide optimal cooling solutions for residential and light commercial applications. This model exemplifies the balance of innovative technology and user-friendly features, making it a popular choice for homeowners and contractors alike.

One of the standout characteristics of the 4AC16LT is its ENERGY STAR certification, which signifies its energy efficiency and eco-friendly operation. The unit is engineered to reduce energy consumption while delivering reliable performance, ultimately helping to lower electricity bills for consumers.

The 4AC16LT features a scroll compressor, a technology known for its durability and efficiency. This compressor design not only improves the overall cooling efficiency but also minimizes operational noise, providing a quiet and comfortable indoor environment. The unit's sound levels are notably reduced, making it ideal for residential settings where noise can be a significant concern.

In addition to its efficient compressor, the unit boasts a range of advanced technologies. The integrated smart diagnostic features allow technicians to quickly identify and troubleshoot issues, streamlining maintenance and reducing downtime. This is particularly beneficial for contractors, as it enhances service response times and customer satisfaction.

The 4AC16LT is also equipped with a durable cabinet design, which is resistant to rust and corrosion, ensuring longevity and reliability in various environmental conditions. The pre-painted steel casing not only enhances the unit’s durability but also adds an aesthetic appeal that blends well with most home exteriors.

Further enhancing its appeal, the unit utilizes environmentally friendly refrigerants that comply with current regulations. This commitment to sustainability demonstrates Allied Air Enterprises’ focus on innovation while caring for the environment.

Moreover, the model is designed with ease of installation in mind. The compact size and lightweight construction of the 4AC16LT facilitate straightforward installation, saving time and labor costs for technicians.

In summary, the Allied Air Enterprises 4AC16LT air conditioning unit is a top-tier choice that incorporates energy efficiency, advanced technology, and a user-friendly design. Its combination of quiet operation, robust features, and commitment to sustainability makes it an excellent investment for anyone seeking reliable indoor comfort.
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