Description

4 Ton – Variable Speed Heat Pump System

Complete Home Comfort Bundle

Experience year-round comfort and efficiency with the 4 Ton Elite® Series Cold Climate Heat Pump System. This complete package includes the EL21KLV heat pump, CBK48MVT variable-speed air handler, and ECB48-15CB-P electric heat kit, providing reliable, high-efficiency heating and cooling, even in cold climates.

SEER2: 20.5

SEER2 & HSPF2 Ratings

SEER2: 20.5
HSPF2: 9

With SEER2 20.5 and HSPF2 9, this system delivers top-tier energy savings and reliable climate control while fully meeting 2025 refrigerant standards. The system uses R-454B refrigerant for eco-friendly, high-performance operation.

High-Efficiency Heating & Cooling – Heat Pump: EL21KLV

The EL21KLV heat pump is a variable-capacity, cold climate heat pump designed for energy-efficient operation in cold environments. ENERGY STAR® 6.1 Cold Climate Certified, it meets or exceeds federal efficiency guidelines and is eligible for the Federal Energy Efficient Home Improvement Tax Credit.

Features:
- Variable-capacity compressor ensures precise temperature and humidity control
- Digital-ready for Lennox S40 Smart Thermostat integration
- Quiet operation as low as 60 dBA
- Durable Quantum™ Coil and heavy-gauge steel cabinet
- Braze-free installation flexibility for modern HVAC setups
- Refrigerant Detection System (RDS) ensures safe operation
Supplemental Heating – Heat Kit: ECB48-15CB-P

The ECB48-15CB-P Electric Heat Kit provides fast, reliable supplemental heat during colder periods. With helix-wound nichrome elements, this kit ensures efficient heat transfer, lower element temperatures, and long service life. Safety features include built-in limit controls, thermal cutoff protection, and integrated circuit breakers. Pre-wired and plug-in ready, installation is simplified, and performance is optimized.

Reliable Airflow – Air Handler: CBK48MVT

The CBK48MVT variable-speed air handler delivers consistent airflow and home comfort. Featuring all-aluminum Quantum™ Coil technology, it resists corrosion and ensures long-lasting efficiency. Its variable-speed blower motor maintains steady airflow, eliminating hot or cold spots. Optional electric backup heat provides instant warmth when needed. Fully insulated, the cabinet reduces noise and prevents condensation. The built-in Refrigerant Detection System (RDS) adds a layer of safety and peace of mind.

Why Choose the Elite® Series Cold Climate Heat Pump System?

Ideal for homeowners in colder climates, this system offers:
- Quiet, reliable, and efficient year-round heating and cooling
- Eco-friendly R-454B refrigerant
- Fully 2025-compliant technology with digital-ready controls
- Supplemental electric heat for immediate warmth
- Built-in safety features including RDS and circuit protection
Key Benefits at a Glance

✅ 4 Ton variable-capacity cold climate heat pump
✅ SEER2 20.5 / HSPF2 9 for high efficiency
✅ Quiet operation – as low as 60 dBA
✅ Complete bundle: heat pump, air handler, and electric heat kit
✅ Braze-free installation flexibility
✅ Built-in Refrigerant Detection System (RDS)
✅ 2025-compliant system with R-454B refrigerant

The 4 Ton Elite® Series Cold Climate Heat Pump System includes the EL21KLV heat pump, CBK48MVT air handler, and ECB48-15CB-P electric heat kit. Fully 2025-compliant with R-454B refrigerant, this system provides efficient, quiet, and reliable heating and cooling, designed for cold climate performance and home comfort.

Heat Pump Overview

Model #: EL21KLV-048

Product Overview

Elite® Series | EL21KLV Heat Pump

The EL21KLV is a high-efficiency, digital-ready, variable-capacity cold climate heat pump, fully compatible with 2025 refrigerant standards.

Energy Efficiency

Achieves energy performance ratings of up to 20.5 SEER2 and 10.0 HSPF2.
Variable-capacity compressor offers enhanced precision in temperature and humidity regulation.
ENERGY STAR® 6.1 Cold Climate Certified – exceeds federal standards for cold climate efficiency.
Eligible for Federal Tax Credits through the Energy Efficient Home Improvement Credit (IRC Section 25C).
Digital-ready configuration when paired with a compatible digitally enabled furnace or air handler and the Lennox S40 Smart Thermostat.

Quiet Operation

Operates as quietly as 60 dBA, ensuring minimal outdoor noise.
Precision-balanced, direct-drive fan delivers quieter performance and increased reliability.

Build Quality & Craftsmanship

Quantum™ Coil – Built from Lennox’s exclusive aluminum alloy, rigorously tested for durability and corrosion resistance under extreme conditions.
Rugged cabinet construction – Features heavy-gauge galvanized steel, louvered coil guards, baked-on powder-coated finish, and composite base and top panel for lasting protection against rust and environmental wear.
Braze-free installation capable, offering added installation flexibility for 2025-compliant systems.
Integrated drainage holes help prevent moisture buildup in the base pan, extending product life.

Safety & Reliability

Equipped with a Refrigerant Detection System (RDS) in compliance with safety standards for A2L (mildly flammable) refrigerants:
- Sensor identifies refrigerant leaks
- Control board halts system operation and activates the indoor blower to safely disperse refrigerant
Uses R-454B refrigerant, meeting the 2025 EPA regulations for low global warming potential (GWP) refrigerants.

Product Specifications:

Brand	Lennox
Catalog Number	25J90
Model/Part Number	EL21KLV-048-230
Base Unit of Measure	Unit(S)
Family	EL21KLV
Series	Elite
Product Voltage	208-230 VAC 1 Ph 60 Hz
Cooling Capacity	4 Ton
Product Depth	39.64 Inch
Product Width	35.64 Inch
Product Height	39.33 Inch
Compressor Stages	Variable Capacity
Type	Low Ambient Heat Pump
SEER2	Upto 20.5 SEER2
HSPF2	Up to 9.5 HSPF2
Gross Weight	295 Lbs.
Refrigerant Type	R-454B

Heat Kit Overview

Model #: ECB48-15CB-P

Product Overview

Lennox ECB48 Electric Heat Kits

The Lennox ECB48 Electric Heat Kits are ETL listed and designed for field installation within the unit cabinet. These kits are available in a range of voltage and kilowatt (kW) options—refer to specific Air Handler Tables for proper sizing and compatibility.

Each kit features helix-wound nichrome heating elements positioned directly in the airstream for fast heat transfer, lower operating temperatures, and extended service life. Every element includes a precisely located limit control with a fixed shut-off temperature and automatic reset, ensuring reliable thermal protection. A supplemental thermal cutoff provides an added layer of safety in case of high-temperature conditions.

Heater control relays are included as standard and manage the staging of heating elements based on control board input. Elements are brought online sequentially and in equal stages, with built-in time delays to ensure efficient operation.

The control box and access panel are constructed from heavy-gauge galvanized steel for durability. All components are factory assembled, pre-installed, and wired for quick and easy setup. Low-voltage electric heat controls connect directly to the air handler via a plug-in interface.

Circuit Breaker Models (CB)

“CB” model heaters include integrated circuit breakers that offer both overload and short circuit protection. These breakers are:

Factory-mounted and wired within the electric heat unit
Current-sensitive and temperature-actuated
Manually resettable for added user control

In many jurisdictions, these circuit breakers are recognized as an acceptable disconnecting means, eliminating the need for a separate field-supplied disconnect. Always verify local electrical codes to ensure compliance with installation requirements.

Product Specifications:

Brand	Lennox
Catalog Number	27A56
Model/Part Number	ECB48-15CB-P
Base Unit of Measure	Unit(S)
EAN / UPC	66255161447
Product Voltage	208/230v 1ph 60 hz
Gross Weight	7.95 LB
Family	ECB48
Series	ECB48
For Use With	CBK48 Series Air Handlers

Air Handler Overview

Model #: CBK48MVT-060-71

Product Overview

CBK48MVT Air Handler

The CBK48MVT is a high-efficiency, variable-speed air handler that delivers consistent comfort and is fully compatible with 2025-compliant refrigerants. Engineered for reliable performance, this model combines proven durability with advanced airflow control.

Advanced Coil Technology

Built with all-aluminum Quantum™ Coil technology, the CBK48MVT offers superior resistance to corrosion caused by indoor environmental contaminants—ensuring long-lasting, efficient performance.

R-454B & Leak Detection Ready

Factory-configured for R-454B refrigerant, these -71 models are equipped with a Refrigerant Detection System (RDS). If a leak occurs, a built-in sensor triggers the mitigation control to initiate a flush sequence, helping maintain safe system operation and providing peace of mind.

Energy Efficiency

High-efficiency indoor coil ensures excellent heat transfer and minimal airflow resistance
Variable-speed blower motor delivers consistent airflow and helps eliminate hot or cold spots

Quiet Operation

Fully insulated cabinet minimizes sound output for quiet performance
Helps prevent cabinet sweating in hot and humid environments

Home Comfort

Optional electric backup heat provides a quick and reliable source of warm air when needed most

Reliable Performance

Antimicrobial drain pan inhibits mold and mildew growth
Promotes better indoor air quality and helps prevent drain line clogs

Product Specifications:

Brand	Lennox
Catalog Number	25J80
Model/Part Number	CBK48MVT-060-71
Base Unit of Measure	Unit(S)
EAN / UPC	66255159253
Family	CBK48MVT
Series	DLSC
Cooling Capacity	5 Ton
Configuration	Multi-Position
Blower Type	Variable Speed
Coil Material	Aluminum
Product Voltage	208-230 VAC 1 Ph 60 Hz
Type	Air-Handler
Refrigerant Type	R-454B
Communicating	Communicating

Documents

Heat Pump:

Literature

Elite® – Pocket Brochure (20B02) (05/25)

Elite® – Heat Pump Specification Chart – R-454B (38Z49) (06/25)

Elite® – Heat Pump Comparison Card (Canada) – R-454B (38Z33) (04/25)

Product Specifications

EL21KLV (2-5 Ton) R-454 EHB

Installation Instructions

EL21KLV (2-5 Ton) R454B Instruction

Service Literature

EL21KLV (2-5 Ton) R-454 Service

User Manuals

Heat Pump System Information for Homeowner/User User Manual

Warranties

Basic Limited Warranty – Elite

Air Handler:

Literature

Lennox Pocket Brochure (19Y95) (01/25)

Ultimate Comfort System™ Product Insert (20Y99) (01/25)

Dave Lennox Signature® Collection – Air Handler Specification Chart – R-454B (38A68) (08/24)

2025 Refrigerant Transition Flyer – Coils/Air Handlers (31B45) (08/24)

Air Handler Comparison Card – R-454B (37G14) (08/24)

Dave Lennox Signature® Collection – Pocket Brochure (20B01) (05/25)

Product Specifications

CBK48MVT (1.5-5 Ton) Variable Communicating R-454 EHB

Installation Instructions

CBK48MVT-71 Air Handler

Service Literature

CBK48MVT (1.5-5 Tons) R454B Service

Warranties

Basic Limited Warranty – Dave Lennox Signature Collection

Other Information

Understanding SEER vs SEER2

What is SEER?

SEER stands for Seasonal Energy Efficiency Ratio. It measures the cooling efficiency of an air conditioner or heat pump over an entire cooling season. Essentially, it tells you how much cooling output (BTUs) you get for every unit of energy (watt-hour) used.

Higher SEER = more efficient
SEER ratings have traditionally been used in the U.S. to compare energy efficiency across systems.
Example: A 14 SEER unit uses less electricity than a 10 SEER unit to produce the same cooling.

What is SEER2?

SEER2 is the updated efficiency rating standard that reflects new federal testing procedures implemented by the Department of Energy (DOE) in 2023. It measures efficiency more accurately by accounting for real-world conditions, including:

Energy usage in modern airflow and installation configurations
More realistic climate and seasonal variations
Changes in the refrigerants and equipment designs

Key difference: SEER2 ratings tend to be slightly lower than SEER ratings for the same unit, but they provide a truer representation of actual efficiency in your home.

Why SEER2 is the new standard

The DOE updated testing to better match how systems perform in real homes, rather than ideal lab conditions.
It encourages manufacturers to improve real-world efficiency, not just test-case efficiency.
For consumers, SEER2 ensures:
- Better long-term energy savings
- Improved comfort through more accurate performance expectations
- Compliance with modern federal efficiency regulations

In short:

SEER = old efficiency measurement (ideal lab conditions)
SEER2 = modern, realistic efficiency standard (real-world performance)
Better quality = SEER2 units are designed and tested to give actual efficiency and savings, not just theoretical numbers.

Understanding EER vs EER2

What is EER?

EER stands for Energy Efficiency Ratio. It measures an air conditioner or heat pump’s efficiency at a single, specific outdoor temperature, usually 95°F.

Higher EER = more efficient at peak conditions.
Unlike SEER, which averages efficiency over a season, EER tells you how the unit performs under hot, steady-state conditions.
Example: A unit with an EER of 12 produces 12 BTUs of cooling for every watt of electricity consumed.

What is EER2?

EER2 is the updated testing standard introduced by the Department of Energy (DOE) to match the same real-world adjustments as SEER2.

Accounts for modern system designs, refrigerants, and installation configurations.
Measures efficiency more realistically under peak operating conditions, rather than just ideal lab setups.
Like SEER2, EER2 numbers are usually slightly lower than traditional EER, but they are a more accurate reflection of actual performance.

Why EER2 is the new standard

Ensures consistency with SEER2 testing methodology.
Reflects true cooling efficiency under extreme heat, where peak performance matters most.
Helps consumers understand real-world energy use and savings potential during the hottest days.
Meets modern federal efficiency regulations and encourages manufacturers to improve performance under actual conditions.

In short:

EER = old standard, measured under lab conditions at 95°F
EER2 = modern standard, measured under realistic, real-world peak conditions
Better quality = EER2 gives you true peak efficiency, not just theoretical performance.

4 Ton – Variable Speed Heat Pump System