Lennox CBX25UH-T MERIT® Series Air Handler

Model Number Identification

The model number structure provides key information about the unit. For example, in 'CB X 25 UH - 030 - T - 10':

• CB: Unit Type (Air Handler)
• X: Refrigerant Type (R-410A)
• 25: Series
• UH: Configuration (Upflow/Horizontal)
• 030: Nominal Cooling Capacity (8.8 kW / 2.5 tons)
• T: Voltage (220/240V - 1 phase - 50Hz)
• 10: Minor Revision Number

Nominal Cooling Capacity Mapping:

• 024 = 7.0 kW (2 tons)
• 030 = 8.8 kW (2.5 tons)
• 036 = 10.6 kW (3 tons)
• 048 = 14.1 kW (4 tons)
• 060 = 17.6 kW (5 tons)

Key Features

The CBX25UH-T air handler is designed for efficient and reliable operation, featuring:

• Copper Tube/Enhanced Fin Evaporator Coil: Assembled in an "A" configuration for large surface area, excellent heat transfer, and low air resistance. Features precise circuiting, ripple-edged aluminum fins on seamless copper tubes, and lanced fins for maximum air stream exposure. Tubing is designed for easy servicing and leakproof construction.
• R-410A Refrigerant System: Utilizes a non-chlorine, ozone-friendly R-410A valve, which is a wide-range, Chatleff style fitting, factory-installed internally.
• Refrigerant Line Connections: Suction (vapor) and liquid lines have sweat connections extending outside the cabinet for ease of connection.
• Filter: Includes a disposable 25 mm filter, with a filter rack furnished in the cabinet for easy installation.
• Blower: Equipped with a multi-speed permanent split capacitor (PSC) motor, allowing for choice of blower speeds via simple wiring changes. The blower is easily removable for servicing.
• Time Delay Blower Relay: Provides a one-second blower "on" delay before continuous fan/cooling operation and a 45-second blower "off" delay after continuous fan/cooling operation.
• Controls: Includes a standard 24-volt transformer and blower cooling relay, factory-installed in the unit control box.
• Cabinet: Constructed of heavy gauge galvanized steel with a pre-painted finish. It is completely insulated with foil-faced fiberglass insulation. Removable panels provide full service access, and a filter access door with thumbscrews allows for easy filter replacement. Electrical inlets are provided in the sides and top of the cabinet. Drain connection plugs are located in the cabinet for upflow (left/right) and horizontal applications.
• Low Leakage Cabinet: All models meet ANSI/ASHRAE Standard 193-2010 for air tightness, with less than 2% air leakage.
• Anti-Microbial Dual Position Drain Pans: Feature an anti-microbial additive to resist mold and mildew growth, improving indoor air quality and reducing drain line blockage. These deep, corrosion-resistant, high-temperature engineered polymer drain pans have dual pipe drains and are designed for upflow or horizontal applications.

Applications

The CBX25UH-T models are suitable for nominal capacities ranging from 7.0 to 17.6 kW (1.5 to 5 Tons). They are designed for upflow or horizontal applications. Downflow applications are possible with an optional conversion kit. These units are compatible with R-410A expansion valve systems for cooling and check and expansion valve systems for heat pump applications.

Approvals

• Tested and rated in accordance with AHRI Standard 210/240 test conditions.
• Air handlers and components are bonded for grounding to meet safety standards required by Intertek (ETL) and the International Electrotechnical Commission (IEC).
• Manufacturing Quality System is registered to ISO 9001.

Specifications

General Data & Connections

Indoor Coil

Blower & Filters

Shipping Data

Electrical Data

Notes:

1. Disposable filter.

2. Heating Air Conditioning and Refrigeration type circuit breaker or fuse.

3. Refer to local electrical codes to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 75°C (167°F).

Blower Performance Data

All air data measured external to unit with dry coil and 25 mm (1 inch) non-pleated air filter in place.

CBX25UH-024-T Blower Performance

CBX25UH-030-T Blower Performance

CBX25UH-036-T Blower Performance

CBX25UH-048-T Blower Performance

CBX25UH-060-T Blower Performance

Installation Clearances

Note #1: Front service access requires a minimum of 24 inches (610 mm). If cabinet depth exceeds 24 inches (610 mm), allow a minimum of the cabinet depth plus 2 inches (51 mm).

Dimensions - Unit - Upflow

Diagram shows Top View, Front View, and Side View with dimensions labeled A through J.

Top View: Shows supply air opening, line voltage inlets, and low voltage inlets.

Front View: Shows air flow direction, suction and liquid line connections, condensate drain piping plate, and filter access. Key dimensions include A (height), H (width), and J (depth).

Side View: Shows overall unit dimensions.

Dimensions - Unit - Horizontal

Diagram shows Top View, Front View, and End View with dimensions labeled A through J. Note: Shipped for horizontal left-hand discharge; field conversion to horizontal right-hand discharge is possible by repositioning the horizontal drain pan.

Top View: Shows supply air opening, line voltage inlets, and low voltage inlets.

Front View: Shows air flow direction, suction and liquid line connections, condensate drain piping plate, and filter access. Key dimensions include A (height), H (width), and J (depth).

End View: Shows overall unit dimensions.

Dimensions - Accessories

Side Return Unit Stand (Upflow Only)

Diagram shows a stand for the air handler, with dimensions for front, side, and height. It is adjustable to accommodate all units.

Dimensions:

• Height: 406 mm (16 in.)
• Front Width: 540 mm (21-1/4 in.)
• Side Width (Adjustable): 508 mm (20 in.) to 635 mm (25 in.)

Optional Accessories