Overview
The Lennox ML296UHV(K) is a residential gas furnace from the Merit® Series, designed for efficient and reliable heating. It boasts a 96% Annual Fuel Utilization Efficiency (AFUE) and offers input capacities ranging from 44,000 to 110,000 Btuh. This furnace is suitable for upflow or horizontal installations and features a two-stage heating system and a variable speed blower for enhanced comfort and energy savings. It also includes refrigerant detection capabilities.
Model Number Identification
The model number ML 2 96 UH 070 X V 36 B K provides specific details:
- Unit Type: ML = Merit® Series
- Stages: 2 = Two-Stage
- AFUE: 96 = 96%
- Configuration: UH = Upflow/Horizontal
- Nominal Gas Heat Input: 045 (44,000 Btuh), 070 (66,000 Btuh), 090 (88,000 Btuh), 110 (110,000 Btuh)
- Nominal Add-On Cooling Capacity: 36 (2-3 tons), 48 (2.5-4 tons), 60 (3-5 tons)
- Blower: V = Variable Speed Blower Motor
- Low NOx: X = Meets California Nitrogen Oxides Standard (40 ng/J)
- Refrigerant Detection: K = Refrigerant Detection-Ready
- Cabinet Width: B = 17-1/2 in., C = 21 in.
Feature Highlights
- Lennox Duralok Plus™ Heat Exchanger
- Secondary Heat Exchanger
- Inshot Burners
- SureLight® Hot Surface Ignitor
- Two-Stage Gas Control Valve
- Two-Speed Combustion Air Inducer
- Flame Rollout Switches
- SureLight® Integrated Furnace Control
- Variable Speed Direct Drive Blower
- Insulated Cabinet
- Safety Interlock Switch
- Gas Piping And Electrical Inlets
Specifications Summary
| Feature | Specification |
|---|---|
| AFUE | 96% |
| Input Capacity (Btuh) | 44,000 to 110,000 |
| Output Capacity (Btuh) | 42,000 to 106,000 (varies by model) |
| Heating Stages | Two-Stage |
| Blower Type | Variable Speed Direct Drive |
| Cabinet Widths | 17-1/2 in. (B) and 21 in. (C) |
| Refrigerant Detection | Ready |
| Voltage | 120 volts - 60 hertz - 1 phase |
Applications and Zoning
The ML296UHV(K) is designed for residential applications and can be installed in utility rooms, alcoves, closets, crawl spaces, or attics. Its variable speed blower makes it ideal for zoning applications, allowing for precise temperature control in different areas of a home when used with compatible zoning systems like the Lennox® LZSV Variable Zoning System.
Heating System Components
- Lennox Duralok Plus™ Heat Exchanger: Features a main multi-pass crimped seam design for efficiency and durability.
- Secondary Heat Exchanger: Condenser coil constructed of aluminum fins and stainless steel tubes for efficient heat recovery.
- Inshot Burners: Provide efficient, trouble-free operation with proper air-gas mixture.
- SureLight® Hot Surface Ignitor: Offers reliable, long-life ignition.
- Two-Stage Gas Control Valve: Combines manual shut-off, automatic electric valve, and gas pressure regulation.
- Two-Speed Combustion Air Inducer: Purges the heat exchanger and safely vents flue products.
- Flame Rollout Switches: Provide protection against abnormal operating conditions.
Controls and Operation
The furnace is equipped with the SureLight® Integrated Furnace Control, which communicates with optional Lennox® Communicating Thermostats for optimal performance and auto-configuration. It supports conventional thermostats and offers advanced features like safety controls, diagnostic LEDs, and adjustable blower speed settings via DIP switches. The unit also includes a Refrigeration Detection System (RDS) for enhanced safety with R-454B refrigerant.
Cabinet and Installation
The cabinet is constructed from heavy-gauge, cold-rolled steel with a pre-painted finish. It features a low-profile, narrow width for easy installation and is insulated with foil-faced insulation. A safety interlock switch enhances safety by shutting off power when the blower compartment door is open. Installation clearances are specified for sides, rear, top, front, and floor.
Indoor Air Quality and Optional Accessories
Lennox offers various indoor air quality (IAQ) accessories, including the Healthy Climate® PureAir® Air Purification System, Media Air Cleaners, Whole Home In Duct Air Purifiers, and Ultraviolet Germicidal Lights. Optional accessories for the furnace include different thermostats (e.g., E30, M30 Smart Wi-Fi Thermostats), transformers, filter kits, and a wide range of venting termination kits and accessories.
Blower Data
The variable speed blower motor provides adjustable airflow for heating and cooling, with performance data detailed in blower data tables. These tables specify airflow (cfm) and motor watts at various external static pressures and speed settings, allowing for precise system balancing.
Approvals and Warranty
The furnace is AHRI Certified, CSA International certified, and tested according to US DOE procedures. It is ENERGY STAR® certified and ISO 9001 Registered. The Duralok Plus™ Aluminized Steel Heat Exchanger is covered by a limited twenty-year warranty for residential applications, with other components covered for five years. Specific warranty details are available at www.Lennox.com.
