Lennox CX35-48C-6F-20 Manual: A Comprehensive Overview

This manual details the Lennox CX35-48C-6F-20 indoor coil, offering crucial installation, maintenance, and troubleshooting guidance. It covers nominal capacities from 2.5 to 4 tons,
specifying refrigerant connections (3/8″ & 7/8″) and electrical specifications (120V). Genuine OEM replacement parts are readily available through suppliers like Parts Town, ensuring optimal performance and longevity.

Understanding the Lennox CX35 Series

The Lennox CX35 series represents a significant advancement in indoor air quality and efficiency. These coils are designed for compatibility with a range of Lennox furnaces, offering homeowners enhanced comfort and reduced energy consumption. The CX35 series prioritizes optimized airflow and heat transfer, contributing to consistent temperatures throughout the living space.

Specifically, the CX35 coils are engineered for use with various tonnage systems, including 2;5/3, 3, and 3.5/4 ton configurations. This versatility allows for tailored climate control solutions based on individual home size and insulation levels. Understanding the series’ core principles – efficient operation and broad compatibility – is fundamental to proper installation and maintenance. The series’ design also emphasizes ease of service, with readily accessible components for simplified troubleshooting and repair. Proper selection and installation are key to unlocking the full potential of the CX35 series.

CX35-48C-6F-20 Model Specifics

The Lennox CX35-48C-6F-20 is a specific model within the CX35 series, designated for 2.5/3 and 3-ton applications. It’s an upflow indoor coil, meaning it’s designed for installation in systems where airflow rises vertically. Key specifications include refrigerant connections of 3/8″ and 7/8″, crucial for proper system charge and operation. Shipping weight is approximately 60 lbs, and physical dimensions are 29.5 x 24.5 x 21 inches.

This model features a coil width compatible with specific Lennox furnace cabinet sizes, ensuring a secure and efficient fit. Electrical requirements are 120V, standard for residential applications. The “6F” designation likely refers to specific coil fin characteristics or manufacturing details. Understanding these specifics is vital for technicians and homeowners alike, guaranteeing correct installation, optimal performance, and access to the appropriate replacement parts when needed. Always refer to the complete Lennox documentation for detailed specifications.

Nominal Capacity and Tonnage (2.5/3 ⎼ 4 Tons)

The Lennox CX35 series, including the CX35-48C-6F-20, offers a range of cooling capacities to suit various home sizes and climate needs. Nominal capacity refers to the approximate cooling output, measured in British Thermal Units (BTUs) per hour. This specific model is rated for 48,000 BTUs, effectively covering 2.5 to 3 tons of cooling. Other models within the CX35 line extend up to 60,000 BTUs (3 tons) and even 4 tons, providing flexibility for different applications.

“Tonnage” is a common term for air conditioning capacity, where one ton equals 12,000 BTUs per hour. Selecting the correct tonnage is critical; undersizing leads to insufficient cooling, while oversizing results in inefficient operation and potential humidity issues. Proper load calculations, considering factors like square footage, insulation, and climate, are essential for determining the appropriate CX35 model for a given installation. Accurate sizing ensures optimal comfort and energy efficiency.

Physical Dimensions and Shipping Data

Understanding the physical dimensions and shipping data of the Lennox CX35-48C-6F-20 is crucial for proper installation planning and logistical considerations. This indoor coil unit has dimensions of approximately 29.5 x 24.5 x 21 inches, though precise measurements should always be verified with the official Lennox documentation. These dimensions dictate the necessary space within the furnace cabinet and accessibility for maintenance.

Regarding shipping, the CX35-48C-6F-20 typically weighs around 60 pounds. This weight is important for safe handling during transport and installation. Careful consideration should be given to lifting and maneuvering the unit to prevent damage or injury. The shipping data also includes packaging dimensions, which are vital for receiving and storing the coil prior to installation. Proper handling procedures, as outlined in the installation instructions, are essential to maintain the unit’s integrity.

Coil Widths and Furnace Cabinet Compatibility

Ensuring compatibility between the Lennox CX35-48C-6F-20 indoor coil and the furnace cabinet is paramount for optimal system performance. Coil widths are a critical factor; variations exist, and it’s noted that coil widths do not always align directly. Careful attention must be paid to matching the correct coil width to the corresponding furnace cabinet size.

The CX35-48C-6F-20 is designed for use with specific furnace cabinet widths. Referencing the Lennox compatibility charts is essential to avoid installation issues. Incorrect matching can lead to airflow restrictions, reduced efficiency, and potential system damage. The manual emphasizes verifying these dimensions before commencing installation.

Generally, this coil is compatible with standard furnace widths, but always confirm the specific model’s requirements. Proper fit ensures efficient heat transfer and optimal airflow, contributing to the overall effectiveness of the HVAC system.

Refrigerant Connections (3/8″ & 7/8″)

The Lennox CX35-48C-6F-20 indoor coil utilizes specific refrigerant line sizes for proper operation. It features both 3/8″ and 7/8″ connections, crucial for establishing the correct refrigerant flow within the HVAC system. These connections are vital for efficient heat transfer and overall cooling performance.

The manual details that the suction line connection is typically 7/8″, while the liquid line connection is 3/8″. Correctly identifying and connecting these lines is essential during installation. Improper connections can lead to system inefficiencies, reduced cooling capacity, and potential compressor damage.

Technicians must ensure leak-tight connections using appropriate brazing techniques and materials. The manual stresses the importance of pressure testing the refrigerant lines after installation to verify integrity. Using the correct line sizes and ensuring secure connections are fundamental to the reliable operation of the CX35-48C-6F-20 coil.

Electrical Specifications (120V)

The Lennox CX35-48C-6F-20 indoor coil is designed to operate on a 120V electrical supply. This specification is critical for ensuring safe and proper functionality. The manual emphasizes the importance of adhering to all local electrical codes during installation and maintenance.

Typically, the coil requires a dedicated circuit with appropriate overcurrent protection, such as a fuse or circuit breaker. The specific amperage draw will vary depending on the model and any auxiliary components, but the manual provides detailed electrical diagrams and wiring instructions.

Incorrect voltage or improper wiring can cause significant damage to the coil and potentially create a safety hazard. Technicians must verify the voltage supply before connecting the unit. Grounding the coil correctly is also paramount for safety and to prevent electrical shock. Always disconnect power before performing any electrical work on the CX35-48C-6F-20.

Indoor Coil Installation Instructions

Proper installation of the Lennox CX35-48C-6F-20 indoor coil is crucial for optimal performance and longevity. The manual stresses the importance of verifying furnace cabinet compatibility and ensuring correct coil width alignment. Upflow configurations are specifically addressed, detailing secure mounting procedures.

Installation requires careful attention to refrigerant line connections – utilizing the specified 3/8″ and 7/8″ fittings. Leak testing after connection is mandatory. The manual provides detailed diagrams illustrating proper refrigerant tubing routing and insulation techniques to maximize efficiency;

Electrical connections must be made according to the electrical specifications, ensuring correct voltage and grounding. Airflow adjustments are also covered, emphasizing the need to verify proper airflow rates for the specified tonnage. Finally, a thorough system check is recommended post-installation to confirm correct operation and identify any potential issues.

Matching Furnace Width Considerations

Selecting a compatible furnace width is paramount when installing the Lennox CX35-48C-6F-20 indoor coil. The manual highlights that coil widths are not universally compatible with all furnace cabinets. Careful consideration must be given to ensure proper airflow and prevent system inefficiencies.

Specifically, the documentation references shipping data indicating the coil’s physical dimensions. This data is crucial for verifying adequate clearance within the furnace enclosure. Incorrect matching can lead to restricted airflow, reduced heating/cooling capacity, and potential equipment damage.

The manual provides a table outlining compatible furnace widths for each CX35 series coil size. It’s essential to consult this table during the planning phase. Furthermore, proper sealing between the coil and furnace cabinet is vital to prevent air leakage and maintain optimal system performance. Always prioritize a snug, airtight fit.

Genuine OEM Replacement Parts Availability

Maintaining the Lennox CX35-48C-6F-20 system relies on access to genuine Original Equipment Manufacturer (OEM) replacement parts. Utilizing non-OEM components can compromise performance, void warranties, and potentially damage the unit. Fortunately, sourcing these parts is streamlined through dedicated suppliers.

Parts Town is specifically identified as a key supplier, boasting a large in-stock inventory of Lennox CX35-48C-6F-20 components. Their commitment to same-day shipping, up to 9 PM ET, minimizes downtime during repairs. This rapid availability is critical for maintaining system uptime and customer satisfaction.

When ordering, referencing the correct part number is essential. The Lennox parts catalog and the unit’s documentation provide detailed listings. Prioritizing genuine OEM parts ensures compatibility, reliability, and adherence to Lennox’s stringent quality standards, ultimately extending the lifespan of your CX35 system.

Parts Town as a Supplier

Parts Town emerges as a premier supplier for genuine Lennox CX35-48C-6F-20 replacement parts, distinguished by its extensive in-stock inventory. This robust stock ensures quick access to necessary components, minimizing delays during critical repairs and maintenance procedures. Their specialization in HVAC parts makes them a knowledgeable resource for professionals and homeowners alike.

A significant advantage offered by Parts Town is their same-day shipping capability, extending until 9 PM ET. This expedited delivery service is invaluable when addressing urgent repair needs, reducing system downtime and associated inconveniences. The platform provides a user-friendly interface for locating specific parts based on model number.

Beyond availability and speed, Parts Town emphasizes authenticity, guaranteeing genuine Lennox OEM parts. This commitment to quality ensures compatibility and maintains the integrity of the CX35-48C-6F-20 system, safeguarding its performance and warranty coverage. Their customer support team can assist with part identification and order placement.

Product Brochures and Owner Resources

Accessing comprehensive product brochures and owner resources is vital for maximizing the benefits of your Lennox CX35-48C-6F-20 indoor coil. These materials provide detailed specifications, performance data, and operational guidelines, empowering both installers and end-users. Brochures often include dimensional drawings, refrigerant charge information, and compatibility charts for optimal system matching.

Owner resources typically encompass installation manuals, troubleshooting guides, and maintenance schedules. These documents are designed to facilitate proper setup, efficient operation, and proactive upkeep, extending the lifespan of the unit. Understanding the recommended maintenance practices, such as coil cleaning and filter replacement, is crucial for maintaining air quality and system efficiency.

Lennox provides these resources through their official website and authorized dealer network. Locating the correct documentation ensures adherence to warranty requirements and promotes safe, effective operation. Utilizing these materials contributes to a positive ownership experience and minimizes potential issues.

Troubleshooting Common Issues

Addressing common issues promptly is key to maintaining the efficiency of your Lennox CX35-48C-6F-20 indoor coil. Frequent concerns include reduced airflow, often caused by dirty air filters or blocked coil fins. Inspecting and cleaning these components regularly is essential. Another potential problem is ice formation on the coil, typically stemming from restricted airflow or low refrigerant levels – requiring professional attention.

Water leaks can occur due to a clogged condensate drain line. Flushing the drain line with a vinegar solution can often resolve this. Unusual noises may indicate a failing blower motor or loose components, necessitating inspection by a qualified technician.

If the system isn’t cooling effectively, check the thermostat settings and ensure proper operation. While some issues are easily resolved, complex problems, especially those involving refrigerant or electrical components, should always be handled by a certified HVAC professional to avoid damage or safety hazards.

Understanding Error Codes (If Applicable)

While the Lennox CX35-48C-6F-20 indoor coil doesn’t typically display numerical error codes in the traditional sense, modern systems paired with compatible furnaces or control boards may generate diagnostic trouble codes. These codes, often indicated by flashing LED patterns on the control board, signal specific malfunctions within the HVAC system.

Consult the accompanying furnace or control board manual for a comprehensive list of these codes and their corresponding meanings. Common issues indicated by these codes can range from sensor failures (temperature, pressure) to blower motor problems or refrigerant leaks.

Accurately identifying the code is crucial for effective troubleshooting. Attempting repairs based on guesswork can exacerbate the problem. If you are unfamiliar with interpreting these codes or lack the necessary expertise, it’s highly recommended to contact a qualified HVAC technician for diagnosis and repair. Ignoring these signals can lead to further system damage and reduced efficiency.

Maintenance Schedule and Best Practices

Maintaining your Lennox CX35-48C-6F-20 indoor coil is vital for optimal performance and longevity. A bi-annual inspection, ideally before the heating and cooling seasons, is recommended. This includes visually inspecting the coil for debris, dust accumulation, and signs of corrosion.

Regularly check and clean or replace the air filter in your furnace or air handler – a dirty filter restricts airflow, reducing efficiency and potentially damaging the coil; Periodically inspect refrigerant lines for leaks, though this is best left to a qualified technician.

Ensure proper condensate drain line clearance to prevent water damage. Consider professional coil cleaning every few years to remove stubborn dirt and improve heat transfer. Following these best practices will help ensure efficient operation, extend the lifespan of your system, and maintain consistent indoor comfort.

Airflow Requirements and Adjustments

Proper airflow is crucial for the efficient operation of the Lennox CX35-48C-6F-20 indoor coil. Insufficient airflow can lead to reduced cooling capacity, increased energy consumption, and potential system damage. Refer to the unit’s specifications for recommended airflow rates, typically measured in Cubic Feet per Minute (CFM).

Ensure the furnace or air handler blower motor is correctly sized and operating at the appropriate speed. Ductwork should be properly sized and free of obstructions to minimize airflow resistance. Verify that all vents are open and unobstructed.

If airflow is inadequate, adjustments may be necessary, such as increasing blower motor speed (within manufacturer’s limits) or addressing ductwork issues. A qualified HVAC technician should perform these adjustments to ensure optimal performance and prevent system imbalances. Correct airflow maximizes efficiency and comfort.

Safety Precautions During Installation & Maintenance

Prioritize safety during all installation and maintenance procedures of the Lennox CX35-48C-6F-20. Always disconnect electrical power to the system before commencing any work to prevent electrical shock. Wear appropriate personal protective equipment (PPE), including safety glasses, gloves, and work boots.

Refrigerant handling requires specialized training and adherence to EPA regulations. Avoid contact with refrigerant, as it can cause frostbite. Properly dispose of any recovered refrigerant according to local guidelines.

Exercise caution when handling sharp objects or working in confined spaces. Ensure adequate ventilation when working with cleaning agents or chemicals. Follow all local codes and regulations regarding HVAC system installation and maintenance. A qualified HVAC technician should perform complex repairs or modifications. Ignoring these precautions can lead to serious injury or equipment damage.

Warranty Information for CX35-48C-6F-20

The Lennox CX35-48C-6F-20 indoor coil is covered by a limited warranty, protecting against manufacturing defects in materials and workmanship. The standard warranty typically includes a 5-year limited parts warranty, but extended labor coverage options are often available through registered installers.

Warranty coverage is contingent upon proper installation by a licensed HVAC professional and adherence to recommended maintenance schedules. Registration of the product within a specified timeframe (usually 60 days) is crucial to validate the full warranty period.

The warranty does not cover damage resulting from improper installation, misuse, neglect, or acts of nature. For detailed warranty terms and conditions, refer to the official Lennox documentation provided with the unit or visit the Lennox website. Keep your proof of purchase and warranty registration information readily accessible for any potential claims.

Local Code Compliance

Installation of the Lennox CX35-48C-6F-20 indoor coil must strictly adhere to all applicable local, state, and national codes and regulations. These codes govern aspects like refrigerant handling, electrical connections, and ductwork requirements, ensuring safety and environmental responsibility.

It is the installer’s responsibility to verify and comply with the most current code versions in the installation area. This includes obtaining necessary permits and scheduling inspections to confirm adherence to standards.

Failure to comply with local codes can result in fines, installation rejection, and potential safety hazards. Always consult with local authorities or a qualified HVAC inspector to ensure full compliance before commencing installation. Proper documentation of code adherence should be maintained for future reference and potential inspections. Ensure compliance with all relevant energy efficiency standards as well.