Lennox CX35-48C-6F-20 Manual: Overview & Specifications
The Lennox CX35-48C-6F-20 is a cased evaporator coil, designed for upflow applications, with a 3․5 to 4-ton nominal cooling capacity and R410A refrigerant compatibility․
Model Identification and Series
The Lennox CX35 series represents a line of cased evaporator coils specifically engineered for residential heating and cooling systems․ This particular model, the CX35-48C-6F-20, falls within this series and is identifiable by its unique alphanumeric designation․ The “48” indicates a nominal capacity range, suitable for 3․5 to 4-ton systems․ The “C” denotes a specific coil configuration, while “6F” likely refers to the coil’s fin design and physical dimensions․
Furthermore, compatibility extends to related series like C35, CHX35, CH35, CR33, and CRX35, offering potential cross-reference options for replacements or system upgrades․ Understanding these identifiers is crucial for accurate parts ordering and ensuring proper system integration during installation or maintenance procedures․ Proper identification guarantees optimal performance and longevity of the HVAC system․
Nominal Cooling Capacity
The Lennox CX35-48C-6F-20 evaporator coil is designed to handle a nominal cooling capacity ranging from 3․5 to 4 tons․ This capacity signifies the amount of heat the coil can remove from the air during operation, directly impacting the cooling performance of the overall HVAC system․ It’s crucial to match the coil’s capacity with the outdoor condensing unit for optimal efficiency and preventing system strain․
Proper sizing ensures the unit can effectively dehumidify and cool the intended space․ Variations within the 3․5-4 ton range allow for flexibility in system design, accommodating different home sizes and insulation levels․ Selecting the correct capacity is paramount for achieving desired comfort levels and minimizing energy consumption, contributing to long-term cost savings․
Refrigerant Type and Compatibility
The Lennox CX35-48C-6F-20 evaporator coil is specifically designed for use with R410A refrigerant․ This refrigerant is a hydrofluorocarbon (HFC) commonly used in modern air conditioning systems due to its higher efficiency and reduced ozone depletion potential compared to older refrigerants․ It is critically important to only use R410A with this unit․
Using incompatible refrigerants can cause severe damage to the compressor and other components, voiding the warranty and potentially leading to system failure․ Ensure that any service or repair work involving the refrigerant is performed by a qualified HVAC technician who is certified to handle R410A safely and responsibly, adhering to all relevant environmental regulations․
Installation Guidelines
Proper installation is crucial for optimal performance․ Ensure correct unit placement, adequate airflow, and secure refrigerant line connections following the manual’s detailed instructions․
Proper Unit Placement
Careful consideration of unit placement is essential for efficient operation and longevity of the Lennox CX35-48C-6F-20 coil․ The installation instructions emphasize selecting a location that allows for unobstructed airflow, both to and from the coil․
Ensure sufficient clearance around the unit for maintenance and service access․ Avoid placing the coil in areas prone to excessive moisture, dust, or corrosive substances․ The physical dimensions, including the 445-inch height and 699-inch length (for the -48C-6F model), must be factored into the available space․
Proper support and leveling are also critical to prevent strain on the refrigerant lines and ensure stable operation․ Refer to the detailed dimensional drawings within the manual for precise placement guidelines․
Airflow Requirements
Maintaining proper airflow across the Lennox CX35-48C-6F-20 coil is paramount for achieving optimal cooling performance and preventing system inefficiencies․ The manual details specific air volume and static pressure drop characteristics, as outlined in Table 4 for the C35/CX35 series․
Airflow rates must align with the coil’s nominal capacity (3․5 to 4 tons) and the connected ductwork․ Excessive static pressure can reduce airflow and diminish cooling capacity, while insufficient airflow can lead to coil freezing․
Regularly inspect and maintain the ductwork to ensure unobstructed airflow․ Filter cleanliness is also crucial; a dirty filter significantly restricts airflow and impacts performance․
Refrigerant Line Connections
Proper refrigerant line connections are critical for the Lennox CX35-48C-6F-20 coil’s efficient operation and to prevent refrigerant leaks․ The CHX35 series installation instructions specify connection sizes for both suction/vapor and liquid lines․
For models like the CX35-48B-2F and CX35-48C-2F, the suction line connection is typically a sweat connection with a specified outside diameter (o․d․) in inches․ Similarly, the liquid line also utilizes a sweat connection with its own designated o․d․
Ensure all connections are meticulously brazed or flared, adhering to industry best practices, and thoroughly leak-tested after installation to maintain system integrity․
Operational Characteristics
The CX35-48C-6F-20 coil features a thermal expansion valve (TXV) for precise refrigerant control, and its performance is defined by air volume and static pressure drop․
Air Volume and Static Pressure Drop
Understanding air volume and static pressure drop is crucial for optimal system performance with the Lennox CX35-48C-6F-20 coil․ Table 4, referenced in the 507167-02 instruction manual, details these critical parameters․ Air volume, measured in CFM (cubic feet per minute), dictates the amount of air circulated, directly impacting cooling capacity․ Static pressure drop, expressed in inches of water column (in․ w․c․), indicates resistance to airflow through the coil․
Higher static pressure drop necessitates a more powerful blower motor to maintain adequate airflow․ Lennox emphasizes the importance of adhering to specified airflow rates to prevent damage to the unit․ Proper airflow ensures efficient heat transfer and prevents coil freeze-up․ Consult the manual for specific CFM and static pressure drop values corresponding to different blower speeds and configurations for the CX35 series coils․
TXV (Thermal Expansion Valve) Details
The Lennox CX35-48C-6F-20 evaporator coil is specifically designed for use with a TXV (Thermal Expansion Valve) and operates with R410A refrigerant․ The TXV precisely controls refrigerant flow to the evaporator, optimizing cooling performance based on system demand․ This valve modulates refrigerant based on superheat, ensuring efficient evaporation and preventing liquid floodback to the compressor․
Proper TXV operation is vital for system efficiency and longevity․ Incorrect TXV sizing or malfunction can lead to reduced cooling capacity, compressor damage, or coil freeze-up․ The product information from LennoxPros confirms the TXV configuration for this model․ Technicians should verify correct TXV operation during installation and maintenance, checking superheat levels to ensure optimal refrigerant flow and system performance․
Electrical Connections
The Lennox CX35-48C-6F-20 evaporator coil requires proper electrical connections for safe and efficient operation․ While specific wiring diagrams are found in the full installation manual, standard 24V control voltage is utilized for fan control and TXV operation․ Electrical safety is paramount; always disconnect power before making any connections․
Ensure all connections adhere to local and national electrical codes․ Verify correct voltage and polarity before energizing the system․ The coil’s electrical components are designed to integrate seamlessly with compatible Lennox furnaces and control systems․ Technicians must confirm proper grounding and utilize appropriate wire sizes to prevent overheating and potential hazards․ Refer to the detailed installation instructions for specific wiring configurations․
Maintenance and Cleaning
Regular coil cleaning with potable water (under 50psi) is crucial․ Avoid pH levels below 5 or above 9 to prevent aluminum coil damage․
Coil Cleaning Procedures
Maintaining a clean coil is vital for optimal performance of the Lennox CX35-48C-6F-20․ Begin by disconnecting power to the unit before any cleaning attempts․ Use potable water at a moderate pressure, ideally less than 50 psi, to gently rinse away debris․ Avoid high-pressure washing, as this can damage the delicate aluminum fins․
If water alone isn’t sufficient, Lennox recommends employing a specialized coil cleaner․ Crucially, ensure the cleaner’s pH level falls between 5 and 9 to prevent corrosion of the aluminum coil․ Apply the cleaner according to the manufacturer’s instructions, followed by a thorough water rinse to remove all traces of the cleaning solution․ Inspect the coil fins for any bending and carefully straighten them with a fin comb if necessary․
pH Levels for Cleaning Solutions
When cleaning the aluminum coil of the Lennox CX35-48C-6F-20, strict adherence to pH levels is paramount to prevent damage․ Aluminum is highly susceptible to corrosion, and using solutions outside the recommended range can significantly reduce the coil’s lifespan and efficiency․ Lennox explicitly advises against cleaners with a pH below 5 (acidic) or above 9 (alkaline)․
Acidic cleaners can rapidly dissolve the aluminum, while highly alkaline solutions can cause pitting and weakening of the metal․ Opt for neutral or mildly alkaline coil cleaners specifically formulated for aluminum fins, ensuring the pH remains within the 5-9 range․ Always verify the pH of any cleaning solution before application and thoroughly rinse the coil with water after cleaning to neutralize any residue․
Recommended Cleaning Frequency
Maintaining the Lennox CX35-48C-6F-20’s efficiency hinges on a consistent coil cleaning schedule․ While specific frequency depends on environmental factors, a general guideline is to inspect the coil at least twice yearly – once before the cooling season and again mid-season․ In dusty or polluted environments, monthly inspections and cleaning may be necessary․
Regular cleaning prevents the buildup of dirt, debris, and allergens that restrict airflow and reduce cooling capacity․ Visual inspection should reveal any significant accumulation requiring attention․ Prioritize cleaning if you notice reduced airflow, increased energy bills, or ice formation on the coil․ Always follow proper cleaning procedures, utilizing pH-balanced solutions and moderate water pressure to avoid damage․
Troubleshooting Common Issues
Addressing problems involves identifying potential issues and utilizing error codes for diagnostics․ Reduced airflow or ice formation may indicate coil contamination or refrigerant issues․
Identifying Potential Problems
Several indicators suggest potential issues with the Lennox CX35-48C-6F-20 coil․ Reduced cooling capacity is a primary concern, often stemming from restricted airflow or refrigerant leaks․ Inspect the coil for visible ice buildup, which signals low refrigerant charge or inadequate airflow across the evaporator․
Listen for unusual noises during operation; these could indicate a failing blower motor or compressor issues․ Examine the condensate drain line for clogs, as blockages lead to water damage․ Furthermore, verify proper electrical connections and voltage levels․
Regular visual inspections of the aluminum coil are crucial, checking for corrosion or physical damage․ Remember, improper cleaning solutions (pH below 5 or above 9) can severely damage the aluminum fins, hindering performance․ Addressing these issues promptly prevents further complications and ensures optimal system efficiency․
Error Codes and Diagnostics
While the Lennox CX35-48C-6F-20 coil itself doesn’t typically display error codes directly, associated HVAC systems will․ Diagnostics often involve checking the connected furnace or air handler for fault indicators․ Common issues manifesting as system errors include low refrigerant charge, detected by pressure sensors, and airflow obstructions, signaled by reduced static pressure․
Electrical faults, such as open circuits or voltage irregularities, will also trigger error codes on the control board․ A frozen coil can cause compressor lockout errors․
Consult the specific documentation for the paired furnace/air handler to interpret error codes accurately․ Always prioritize safety by disconnecting power before performing any diagnostic tests or repairs․ Professional HVAC technicians should handle refrigerant-related diagnostics and repairs due to EPA regulations․
Component Cross-Reference
The CX35 series coil is compatible with various Lennox coil models like C35, CHX35, CH35, CR33, and CRX35, offering flexible replacement options․
Compatible Coil Models (C35, CHX35, etc․)
The Lennox CX35 series evaporator coils demonstrate broad compatibility across several indoor coil model lines, facilitating easier replacements and system upgrades․ Specifically, the CX35 coil is designed to work seamlessly with the C35 series, offering a direct substitution option for many installations․ Furthermore, compatibility extends to the CHX35 series coils, providing homeowners and technicians with increased flexibility during maintenance or repair procedures․
Lennox also confirms cross-compatibility with the CH35 series, alongside the CR33 and CRX35 models․ This extensive compatibility network ensures that finding a suitable replacement coil is straightforward, minimizing downtime and maximizing system efficiency․ Always verify specific model numbers and tonnage ratings to guarantee a proper fit and optimal performance when selecting a compatible coil․
Replacement Parts Information
Securing genuine Lennox replacement parts is crucial for maintaining the performance and longevity of your CX35-48C-6F-20 evaporator coil; When sourcing components, always prioritize official Lennox distributors or authorized dealers to ensure authenticity and quality․ Common replacement parts include aluminum coil sections, should damage occur, and TXV (Thermal Expansion Valve) assemblies, vital for refrigerant regulation․
Additionally, replacement fan motors, blower wheels, and electrical components may be necessary over time․ Referencing the Lennox parts catalog, accessible through LennoxPros, provides detailed diagrams and part numbers for accurate ordering․ Utilizing non-genuine parts can void warranties and potentially compromise system efficiency, so prioritize official Lennox replacements for optimal results and continued reliable operation․
Physical Dimensions
The CX35-48C-6F unit measures 17-1/2″ x 445″ x 27-1/2″ x 699″, with specific dimensions varying slightly based on model configuration and airflow needs․
Overall Unit Dimensions
Detailed dimensional data is crucial for proper installation and ensuring adequate space within the designated HVAC system enclosure․ The Lennox CX35-48B-6F model exhibits dimensions of 17-1/2 inches in width, 445 inches in depth, 27-1/2 inches in height, and 699 inches in overall length․
Conversely, the CX35-48C-6F variant presents slightly altered measurements, specifically 21 inches in width, 533 inches in depth, 27-1/2 inches in height, and 699 inches in length․ These figures are essential for technicians and installers to verify compatibility with existing ductwork and available space․
Additional key dimensions include 16 inches for certain sections, 406 inches for others, and varying heights like 416 and 318 inches, all contributing to a comprehensive understanding of the unit’s physical footprint․
Coil Fin Spacing
While specific fin spacing details for the Lennox CX35-48C-6F-20 aren’t explicitly stated in the provided excerpts, understanding fin spacing is vital for efficient heat transfer and proper airflow across the coil․ Generally, evaporator coils utilize varying fin spacing to balance performance and resistance to debris accumulation․
Finer fin spacing maximizes surface area, enhancing heat exchange, but is more prone to clogging in dusty environments․ Conversely, wider spacing reduces fouling but compromises heat transfer efficiency․
Technicians should visually inspect the coil fins for cleanliness and damage during maintenance․ Regular cleaning, using appropriate coil cleaners with a pH between 5 and 9, is crucial to maintain optimal performance and prevent corrosion of the aluminum coil․
Connection Sizes (Suction/Liquid Lines)
The Lennox CHX35 series installation instructions specify connection sizes crucial for proper refrigerant flow․ For the CX35 models, the suction/vapor line connection is a sweat connection with an outside diameter (O․D․) measured in inches․ Similarly, the liquid line connection also utilizes a sweat connection, defined by its O․D․ in inches․
Specific dimensions vary based on the model number within the series – for example, the CHX35-48B-2F, CHX35-48C-2F, CHX35-51C-2F, and CHX35-60D-2F each have designated sizes․
Accurate sizing and proper brazing techniques are essential to prevent leaks and ensure optimal system performance․
Safety Precautions
Aluminum coils are susceptible to damage from cleaning solutions with pH levels outside the 5-9 range; handle with care and follow guidelines․
Handling Aluminum Coils
The Lennox CX35 series utilizes aluminum coils, demanding careful handling during installation and maintenance to prevent damage․ These coils are particularly vulnerable to corrosion when exposed to cleaning agents with improper pH levels․ Specifically, avoid solutions falling outside the acceptable range of pH 5 to pH 9․
Using excessively acidic or alkaline cleaners can rapidly degrade the aluminum, reducing coil efficiency and potentially leading to leaks․ When cleaning is necessary, potable water at moderate pressure (less than 50 psi) is recommended as a first approach․ If further cleaning is required, utilize a coil cleaner specifically formulated for aluminum and within the specified pH range․
Always exercise caution to avoid physical damage to the delicate coil fins during handling and cleaning procedures․
Electrical Safety
Prior to performing any electrical work on the Lennox CX35-48C-6F-20 unit, completely disconnect the power supply at the main disconnect to prevent electrical shock and potential equipment damage․ Verify the power is off using a reliable voltage tester․
All electrical connections must adhere to local and national electrical codes․ Ensure proper grounding of the unit is established to minimize the risk of electrical hazards․ Wiring should be appropriately sized for the unit’s electrical requirements, and all connections must be secure and insulated․
Qualified personnel should perform all electrical work, and it’s crucial to retain these instructions for future reference․
Refrigerant Handling Guidelines
The Lennox CX35-48C-6F-20 unit is designed for use with R410A refrigerant․ Handling this refrigerant requires strict adherence to EPA regulations and safety protocols․ Technicians must be certified to handle R410A, ensuring proper recovery, recycling, and disposal procedures are followed․
Avoid releasing refrigerant into the atmosphere, as it contributes to environmental damage․ When servicing the unit, use approved recovery equipment to reclaim any refrigerant before disconnecting lines․ Always wear appropriate personal protective equipment, including gloves and eye protection, when working with refrigerant․
Refer to the unit’s service manual for specific refrigerant charging and leak detection procedures․