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- 4 ton - best for spaces between 2000-2400 sq ft depending on your home's insulation and your climate
- SEER2 rating helps consumers compare energy efficiency when choosing a new air conditioner. Higher SEER2 ratings mean significant utility savings. The federal minimum is 14 SEER2 with ratings into the 20 SEER2 range. A 20 SEER2 uses half the energy of a 10 seer much like MPG ratings for vehicles.
- Heat pumps are all electric and good for mild and cold climates.
- If you have an indoor furnace, or air handler, along with an outdoor AC unit, this system will serve as a replacement for both.
Lennox Merit 4 Ton 14.3 SEER2 Heat Pump System - R454B
- Condenser: ML14KP1-048-230
- Air Handler: CBK45UHET-048
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- 4 ton - best for spaces between 2000-2400 sq ft depending on your home's insulation and your climate
- SEER2 rating helps consumers compare energy efficiency when choosing a new air conditioner. Higher SEER2 ratings mean significant utility savings. The federal minimum is 14 SEER2 with ratings into the 20 SEER2 range. A 20 SEER2 uses half the energy of a 10 seer much like MPG ratings for vehicles.
- Heat pumps are all electric and good for mild and cold climates.
- If you have an indoor furnace, or air handler, along with an outdoor AC unit, this system will serve as a replacement for both.
Lennox Merit 4 Ton Split System Heat Pump Condenser - Up to 17 SEER2, R454B
Model Number
ML14KP1-048-230
Dimensions
32-1/4" W x 32-1/4" D x 37-1/4" H
Documents
ML14KP1-048-230 Specifications
Warranty
Parts: 5 years
Lennox Merit 4 Ton Upflow/Horizontal Air Handler - Quantum Coil, Factory-Installed TXV, R454B
Model Number
CBK45UHET-048
Dimensions
21-1/2" W x 22" D x 59-3/4" H
Documents
Warranty
Parts: 5 years
Heat Kit Options
AHRI Number
215739993
Powerful Year-Round Comfort with Lasting Lennox Performance
Keep your home comfortable through changing seasons with the Lennox Merit ML14KP1-048-230 4 Ton Heat Pump Condenser. Designed for residential split systems, this Merit® Series heat pump provides heating and cooling through a reliable single-stage platform built around Lennox's Quantum™ Coil and scroll compressor technology.
The ML14KP1-048-230 provides a nominal 4-ton capacity. When paired with qualifying indoor equipment, the ML14KP1 family can achieve efficiency ratings of up to 17 SEER2 and 8.2 HSPF2.
Key Features
- 4 Ton Heat Pump – Provides heating and cooling from one outdoor unit.
- Up to 17 SEER2 / 8.2 HSPF2 – Supports efficient operation with qualifying matched equipment.
- R-454B Refrigerant – Lower-GWP refrigerant with zero ozone depletion potential.
- Single-Stage Scroll Compressor – Proven technology for dependable operation.
- Factory-Installed Crankcase Heater – Helps protect compressor operation and lubrication.
- Lennox Quantum™ Coil – Corrosion-resistant aluminum coil technology.
- Heavy-Gauge Steel Cabinet – Protects critical components from outdoor conditions.
Lennox Quantum™ Coil Technology
Built around Lennox's Quantum™ Coil, the ML14KP1 uses an enhanced aluminum alloy tube and fin design for corrosion resistance and effective heat transfer. The coil is factory tested under high pressure and designed to remain accessible for cleaning and maintenance.
Dependable Scroll Compressor Performance
The single-stage scroll compressor delivers consistent refrigerant flow for straightforward heating and cooling performance. Lennox incorporates low gas pulses, a discharge-line muffler, and resilient compressor mounts to help control sound and vibration. A factory-installed crankcase heater helps prevent liquid refrigerant migration into the compressor and supports proper lubrication.
R-454B for Today's HVAC Systems
The ML14KP1 operates with R-454B refrigerant, which Lennox specifies as having low global warming potential and zero ozone depletion potential. An R-454B-compatible indoor unit with the required refrigerant detection system must be used as part of the complete system.
Durable Construction and Service-Friendly Design
A heavy-gauge steel cabinet with louvered panels protects the internal components, while the zinc-coated steel base resists rust and corrosion. Refrigerant line connections and electrical inlets are centrally located for convenient access during installation and future service.
Upgrade your home with dependable Lennox heating and cooling. Pair the ML14KP1-048-230 4 Ton Heat Pump Condenser with compatible indoor equipment for an efficient, reliable year-round comfort system.
High-Efficiency Airflow with Flexible Lennox Design
Enhance your home's heating and cooling system with the Lennox Merit CBK45UHET-048 4 Ton Air Handler. Designed for compatible R-454B air conditioners and heat pumps, this indoor unit combines Lennox Quantum™ Coil technology with a high-efficiency constant-torque blower motor for dependable comfort and more uniform airflow.
The CBK45UHET-048 provides a nominal 4-ton capacity and supports upflow or horizontal installation. Its factory-installed expansion valve and refrigerant detection system help make it ready for integration into a properly matched R-454B residential HVAC system.
Key Features
- 4 Ton Air Handler – Designed for compatible residential air-conditioning and heat-pump systems.
- Upflow or Horizontal Installation – Offers flexibility for different indoor installation requirements.
- Power Saver™ Constant-Torque Blower Motor – Uses high-efficiency ECM technology to provide more uniform airflow across changing static pressure.
- Lennox Quantum™ Coil – Enhanced aluminum alloy construction provides corrosion resistance and effective heat transfer.
- Factory-Installed TXV – Controls refrigerant flow through the indoor coil.
- Integrated Refrigerant Detection System – Supports safe operation with R-454B refrigerant.
- Low-Leakage Insulated Cabinet – Helps reduce conditioned-air loss and supports efficient system performance.
Power Saver™ Constant-Torque Airflow
The CBK45UHET-048 features a Power Saver™ constant-torque blower motor built with high-efficiency ECM technology. By maintaining constant torque output, the motor can provide more uniform airflow as static pressure changes within the duct system. Multiple programmable speeds allow airflow to be configured for the matched equipment.
Durable Quantum™ Coil Technology
The Lennox-designed Quantum™ Coil uses enhanced aluminum alloy tubing and fins for superior corrosion resistance. Its large A-shaped surface area, low air resistance, and precise refrigerant circuiting help promote effective heat transfer and reliable system performance.
Factory-Equipped for R-454B
A wide-range R-454B check and expansion valve is factory installed inside the cabinet. The air handler also includes a refrigerant detection sensor and control board designed to interrupt heating or compressor operation and activate the blower if refrigerant is detected.
Flexible and Service-Friendly Construction
The CBK45UHET-048 ships ready for upflow or horizontal right-hand airflow and can be converted for horizontal left-hand discharge. Removable cabinet panels provide service access, while the slide-out blower assembly, accessible filter door, external refrigerant connections, and multiple electrical inlets help simplify installation and maintenance.
Choose the Lennox Merit CBK45UHET-048 for powerful 4-ton performance, high-efficiency constant-torque airflow, and flexible installation in a compatible R-454B home comfort system.
Optional Electric Heat for Added Cold-Weather Comfort
Customize your Lennox heat pump system with an optional electric heat kit for additional heating support when outdoor temperatures drop. Installed inside the compatible Lennox CBK45 Series air handler, the heat kit provides electric resistance heat that works with the air handler's blower to distribute warm air through your home's existing duct system.
Available heat-kit capacities vary by the selected system and air handler, allowing the equipment to be matched to the home's heating requirements and available electrical service. Compatible configurations may be available with or without factory-mounted circuit breakers.
Electric Heat Kit Benefits
- Supplemental Heating – Adds an additional source of heat when the heat pump requires assistance during colder weather.
- Multiple Heating Capacities – Select systems are available with electric heat options ranging from 4 kW to 15 kW, depending on equipment compatibility.
- 208-230V Single-Phase Operation – Designed for compatible residential electrical applications.
- Responsive Heat Transfer – Helix-wound nichrome heating elements are positioned directly in the airflow to efficiently transfer heat into the moving air.
- Built-In Temperature Protection – Limit controls help protect the heating elements against excessive operating temperatures.
- Factory-Assembled Controls – Heat-kit controls and components are assembled and wired for installation inside the compatible air handler.
- Breaker and Non-Breaker Options – Depending on the selected capacity and system configuration, heat kits may be available with factory-mounted circuit protection or a terminal-block connection.
Choose the Right Heat Kit for Your Home
The correct electric heat kit should not be selected by system tonnage alone. Heating requirements, air-handler compatibility, airflow, supply voltage, available electrical service, wire sizing, circuit protection, and local electrical-code requirements should all be considered when selecting an electric heat option.
Select an available electric heat kit when configuring your system to add dependable supplemental heating for colder conditions. Final equipment compatibility and electrical requirements must be verified by a qualified HVAC or electrical professional.
Who installs the AC unit after I purchase it?
ACDirect does not yet provide installation services directly. However, most of our customers successfully arrange installation through local licensed HVAC contractors. These systems are designed for professional installation and typically include the components your installer will need.
Here’s how it works:
- Hire a licensed HVAC technician in your area
- Use platforms like Angi, Thumbtack, or a local HVAC directory to find reliable professionals
- Confirm your installer is experienced with the system type you’re purchasing
Note:
Please be aware if you choose to install HVAC equipment yourself and don’t possess proper HVAC licensing, you will void the manufacturer’s factory warranty. If you are capable of a factory-compliant installation yourself, you will need a licensed HVAC contractor to sign off on your work, fully confirming factory-compliant workmanship.
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