LENNOX CRX35 Downflow Aluminum Coil User Manual

June 17, 2024
Lennox

LENNOX CRX35 Downflow Aluminum Coil

Specifications

  • Model No.: CRX35
  • Nominal size – Tons: 2 to 5
  • Factory-installed expansion valve: Yes
  • Line connections in.: (2) 3/4 Suction/vapor o.d. – sweat, 3/8 Liquid o.d. – sweat
  • Condensate drain (fpt): 3/8 Indoor Coil: Net face area sq. ft.: 4.08 to 7.00, Tube diameter – in.: 3/8, Number of rows: 3, Fins per inch: 14
  • Shipping weight lbs.: 44 to 75

Product Features

  • Air stream for large surface area
  • FPT drain connections
  • Factory installed expansion valve with non-bleed port
  • Physical match with furnaces of the same letter designation in the model number

Coil Construction
The CRX35 indoor coils feature a cased design and are suitable for downflow installation. The coils are made of high-quality materials to ensure durability and optimal performance. The coil construction includes a large surface area for efficient heat transfer and a factory installed expansion valve for precise refrigerant flow control. The coils have FPT drain connections for easy condensate drainage. Please note that D width coils do not match C width furnace width or openings.

Product Usage Instructions

Installation

  1. Select a suitable location for installation, ensuring proper clearance for airflow and maintenance.
  2. Connect the line connections according to the specifications provided.
  3. Ensure proper condensate drainage by connecting the FPT drain connections.
  4. Install the indoor coil in a downflow configuration, matching it with a furnace of the same letter designation in the model number.
  5. Securely fasten the indoor coil in place using the appropriate mounting hardware.

Maintenance
To ensure optimal performance and longevity of the CRX35 indoor coils, regular maintenance is recommended. Follow these steps:

  1. Turn off power to the unit before performing any maintenance.
  2. Clean the coil surface using a soft brush or vacuum cleaner to remove dust and debris.
  3. Inspect the coil for any signs of damage or leaks. If any issues are found, contact a qualified technician for repairs.
  4. Check and clean the condensate drain regularly to prevent blockages.

FAQ

Q: What is the refrigerant type used in the CRX35 indoor coils?
A: The CRX35 indoor coils use R-410A refrigerant.

Q: Can D-width coils be used with C-width furnaces?
A: No, D-width coils do not match C-width furnace width or openings. Please refer to the Physical Matches drawing on page 5 of the user manual for more information.

Q: What is the recommended air volume for the CRX35 indoor coils?
A: The recommended air volume varies depending on the specific model. Please refer to the Air Resistance section of the user manual for detailed information.

Q: How often should I clean the indoor coils?
A: It is recommended to clean the indoor coils at least once a year or as needed, depending on the operating conditions and level of dust accumulation.

MODEL NUMBER IDENTIFICATION

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(1\)

APPROVALS AND WARRANTY

APPROVALS

  • Tested with matching air conditioners and heat pump units in the Lennox Research Laboratory environmental test room in accordance with AHRI Standard 210/240-2023
  • AHRI Certified system match-ups and expanded ratings, visit www.LennoxPros.com
  • Air resistance tests from Lennox Laboratory air test chamber

WARRANTY

  • All other covered components:
  • Limited five years in residential installations
  • Limited one year in non-residential installations

NOTE – Refer to Lennox Basic Limited Warranty at www.Lennox.com for additional details.

FEATURES

APPLICATIONS

  • 2 to 5 ton nominal sizes
  • Lennox-designed downflow indoor coils can easily be installed with most Lennox downflow furnaces
  • Factory installed R-410A check/expansion valve

COIL CONSTRUCTION

Quantum Coil

  • Lennox designed and fabricated coil
  • Aluminum tubing, hairpins, distributor and header tubes
  • Copper refrigerant sweat connections on both liquid and suction lines for easy brazing
  • Ripple-edged aluminum fins
  • Lanced fins provide maximum exposure of fin surface to air stream
  • Rifled tubing provides superior refrigerant heat transfer
  • Twin coil construction assembled in an “V” configuration for large surface area
  • High pressure testing insures leak-proof construction

Anti-Microbial Drain Pan

  • Non-corrosive, UV-resistant polymer drain pan with dual fpt drain connections
  • Anti-Microbial additive resists growth of mold and mildew on drain pan which improves indoor air quality and reduces drain line blockage

Check/Expansion Valve

  • All models have a factory-installed, internal check/expansion valve
  • For use with R-410A systems
  • Wide range valve
  • Chatleff style fitting
  • Expansion valves are externally-equalized, non-bleed port type

CABINET

  • Pre-painted heavy gauge steel
  • Insulated with thick fiberglass insulation
  • Coil slides out of cabinet for ease of servicing
  • Removable panels provide access to coil
  • Refrigerant lines extend outside of cabinet for easy installation

Furnace Match-Up

  • Coils exactly match corresponding furnaces with the same letter designation in model number
  • No adaptor required
  • Engaging holes furnished on cabinet for alignment with furnace

NOTE – “D” width coils do not match “C” width furnace width or openings. See Physical Matches drawing on page 5

SPECIFICATIONS

2 TO 3 TON

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(2\)

AIR RESISTANCE

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(3\)

DIMENSIONS

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(4\)

DIMENSIONS – FURNACE/COIL COMBINED DIMENSIONS

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(5\)

PHYSICAL MATCHES
DOWNFLOW GAS FURNACES − “C” WIDTH FURNACES WITH “D” WIDTH COIL

( NOTE − Coil DOES NOT match furnace cabinet width and depth or supply air opening width and depth!)

LENNOX-CRX35 -Downflow-Aluminum-Coil-fig-\(6\)

REVISIONS

  • Sections

    • Dimensions
  • Description of Change

    • Added Physical Match-Up for “C” width furnaces with “D” width coil.

Visit us at www.Lennox.com
For the latest technical information, www.LennoxPros.com Contact us at 1-800-9-LENNOX

NOTE – Due to Lennox’ ongoing commitment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability. Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury. Installation and service must be performed by a qualified installer and servicing agency. ©2023 Lennox Industries, Inc.

References

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