Lennox VRF VVCA Series

Questions and Answers

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ritathompsonAug 16, 2025
What to do if my Lennox Air Handler shows a communication error between indoor and outdoor units?
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  Malik DominguezAug 16, 2025
  If your Lennox Air Handler displays a communication error, first note the error code (E1, EE, etc.). Then, try resetting the display by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power cycling, contact VRF Technical Support at 1-844-438-8731.
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Richard LucasAug 19, 2025
What to do if my Lennox Air Handler displays an outdoor units error?
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  Haley LaraAug 19, 2025
  If your Lennox Air Handler displays 'Ed' or another code indicating an outdoor units error, begin by noting the specific code. Next, attempt to reset the system by pressing the ON/OFF button on the unit controller. If the error persists, disconnect and restore power at the unit disconnect switch or circuit breaker. Should the error be temporary, it will not reappear after the reset. However, if the error code continues to show after power has been reset, contact VRF Technical Support at 1-844-438-8731.
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Amanda WadeAug 22, 2025
What to do if my Lennox Air Handler displays an indoor ambient temperature sensor (T1) error?
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  Ricky MartinezAug 22, 2025
  If your Lennox Air Handler shows an indoor ambient temperature sensor error (T1), indicated by a code (E2, EE, etc.), begin by noting the error code. Next, reset the system by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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Dawn KlineAug 26, 2025
What to do if my Lennox Air Handler displays a middle evaporator temperature sensor (T2) error?
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  smithjacobAug 26, 2025
  If your Lennox Air Handler displays a middle evaporator temperature sensor error (T2), shown as a code (E3, EE, etc.), first note the specific code. Then, attempt to reset the display by pressing the ON/OFF button on the unit controller. If the code remains, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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William DavisAug 28, 2025
What to do if my Lennox Air Handler displays an evaporator outlet temperature sensor (T2B) error?
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  Eric GonzalezAug 28, 2025
  If your Lennox Air Handler displays an evaporator outlet temperature sensor error (T2B), indicated by a code (E4, EE, etc.), start by noting the specific code. Then, attempt to reset the system by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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Philip RaymondAug 31, 2025
What to do if my Lennox Air Handler displays an EEPROM error?
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  erinvazquezAug 31, 2025
  If your Lennox Air Handler displays an EEPROM error, indicated by a code (E7, EE, etc.), begin by noting the specific code shown. Next, try resetting the display by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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Francisco MooreSep 3, 2025
What to do if my Lennox Air Handler displays a DC fan motor error?
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  Walter ObrienSep 3, 2025
  If your Lennox Air Handler displays a DC fan motor error, indicated by a code (E6, EE, etc.), first note the error code. Then, reset the display by pressing the ON/OFF button on the unit controller. Press the ON/OFF button a second time to reapply power to unit. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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Shirley MorganSep 6, 2025
What to do if my Lennox Air Handler shows a water level alarm error?
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  Kelsey CollinsSep 7, 2025
  If your Lennox Air Handler displays a water level alarm error, indicated by a code (EE, etc.), start by noting the specific code shown. Then, attempt to reset the system by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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wellscristinaSep 9, 2025
What does it mean if my Lennox Air Handler doesn’t have address when it is first turned on?
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  Jason NguyenSep 9, 2025
  If your Lennox Air Handler doesn’t have address when it is first turned on, and shows a code (FE, etc.), first make a note of the specific code. Then, try resetting the display by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.
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David CruzSep 12, 2025
What does it mean if my Lennox VRF VVCA Air Handlers shows a mode conflict error?
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  Gregory TerrellSep 12, 2025
  If your Lennox Air Handler displays a mode conflict error, indicated by a code (E0, EE, etc.), start by noting the specific code displayed. Try resetting the system by pressing the ON/OFF button on the unit controller. If the code is still displayed, disconnect and restore power at the unit disconnect switch or circuit breaker. If the problem was temporary, the code will not reappear. If the error code reappears after power has been broken and restored at the disconnect switch or circuit breaker, call VRF Technical Support at 1-844-438-8731.

Overview

The VVCA Vertical Air Handler is an indoor unit designed for Variable Refrigerant Flow (VRF) systems, functioning as an air handler to manage and distribute conditioned air within a space. It is specifically designed for indoor installation and, as shipped, is configured for upflow and horizontal-right air discharge applications. The unit can be field-configured for horizontal left-air discharge, offering flexibility in installation.

Key usage features of the VVCA air handler include accessible electrical controls, refrigerant piping connections, and an internally mounted expansion valve kit. It is also equipped with a variable speed blower motor, allowing for precise control over airflow and enhancing energy efficiency. The unit is designed to be integrated with specific heat pumps, heat recovery units, mode switching devices, branch pipes, line sets, and controls, as detailed in the Product Specification bulletin (EHB). This ensures proper system matching and optimal performance.

The installation process emphasizes safety and proper setup. The unit must be supported on a suitable base or a field-supplied support frame for upflow applications, and securely attached to the floor or support frame. For horizontal installations, the entire length of the cabinet must be supported, typically using angle iron or Unistrut channel with threaded rods and nylon-lock nuts. Proper sloping of the unit is crucial to ensure complete drainage of the condensate pan. The air handler is provided with flanges for connecting the supply plenum, and the supply and return duct systems must be adequately sized to meet the system's air requirements and static pressure capabilities. Flexible joints (canvas) are recommended at duct connections to prevent vibration transmission.

Refrigerant piping connections are a critical aspect of the installation. The unit uses two copper lines for refrigerant, which must be individually insulated. Brazing of refrigerant lines must be performed by a qualified technician, following established procedures, including purging with low-pressure nitrogen to prevent oxidation and moisture ingress. It is essential to use specific brazing rods/sticks suitable for air conditioning pipework. All refrigerant piping must be supported within 12 inches (305 mm) of any mechanical fitting to prevent strain.

Condensate piping connections are also vital for proper operation. The air handler has 3/4" NPT condensate drain connections. A 3-inch trap must be installed in the main drain line as close to the unit as practical, ensuring the top of the trap is below the connection to the drain pan for complete drainage. For horizontal runs, an anti-siphon air vent (standpipe) is required ahead of the horizontal run. A field-fabricated secondary drain pan with a drain pipe to the outside of the building is required for installations over finished living spaces or areas susceptible to water damage. All drain lines must be properly routed and insulated to prevent leaks and condensation.

Electrical connections require careful attention. The power supply must be isolated before accessing unit electrical terminals. All wiring must conform to local and national codes (NEC/CEC). The unit nameplate provides minimum circuit ampacity and maximum overcurrent protection size. A 18 GA., 3-conductor, shielded control wire (polarity sensitive) is specified for communication, with all shields connected to the GROUND terminal to ensure proper system communication. The unit must be properly grounded and protected by a circuit breaker.

Maintenance features include the ability to remove and clean the air filter. The air filter is field-provided and installed, and its proper selection and placement are critical to airflow and system performance. The manual provides guidelines for filter sizing, recommending a minimum surface area of 200 sq. in. per ton for the return air filter grille. The unit is equipped with a receiver that has a digital display providing error codes, which can be used for troubleshooting. These codes help identify issues such as communication errors, sensor malfunctions, or fan motor errors. The manual also outlines a spot check performance tracking table to view diagnostic information, aiding in monitoring the unit's operation and identifying potential problems.

The VVCA air handler is designed for long-term reliability and performance, with an emphasis on proper installation and regular maintenance to ensure efficient operation and prevent issues. The detailed instructions and warnings provided in the manual are crucial for safe and effective use of the device.