The Lennox Y4691, featuring the First Co. 31UC10 Wall Air Handler, is a compact and efficient upflow unit designed for residential cooling and heating systems. Built for use with R-410A refrigerant, this 2.5-ton wall-mount design delivers reliable airflow performance in tight spaces where traditional air handlers cannot fit. Its integrated 10 kW electric heat kit provides supplemental heating capability, making it suitable for year-round comfort.

Engineered for multi-family, condo, and light residential applications, the 31UC10 offers quiet operation, durable construction, and easy service access. The unit operates on 240V power and is built to pair seamlessly with matching outdoor condensers for optimized system efficiency.

This air handler features a narrow footprint and wall-mount configuration, measuring 22 1/8" x 15 1/8" x 40", making it ideal for hallways, closets, and compact mechanical spaces.

 

Key Features:

• 2.5-ton cooling capacity
• Integrated 10 kW electric heat strip
• Upflow configuration for efficient air distribution
• Compact wall-mount cabinet for space-restricted installations
• Designed for R-410A refrigerant systems
• Durable, service-friendly construction
• Operates on 240V single-phase power
• Ideal for apartments, condos, and multi-family housing

 

Technical Specifications:

• Model: First Co. 31UC10
• Lennox Part Number: Y4691
• Configuration: Upflow wall-mount air handler
• Capacity: 2.5 Ton
• Electric Heat: 10 kW
• Refrigerant: R-410A
• Voltage: 240V
• Cabinet Size: 22 1/8” W x 15 1/8” D x 40” H