Lennox 49K03 Expansion Valve (R22)

The Lennox 49K03 Expansion Valve (R22) is a Lennox valve for HVAC repair and replacement work. Use it when the part number 49K03 and the listed specifications match the equipment being serviced.

49K03 is an official OEM Expansion Valve (R22) for Lennox HVAC equipment.

Key Specs

• Features: R22 Refrigerant
• Product Type: Valve

Fitment Notes

Captured equipment fit data references models including CB28UH-018-230-1, CB28UH-018-230-2, CB28UH-024-230-1, CB28UH-024-230-2, CB28UH-030-230-1, CB28UH-030-230-2, CB29M-21-1, CB29M-21-2, CB29M-21-3, CB29M-21-4, CB29M-26-1, CB29M-26-2. Verify the complete unit model and service manual before installation.

Expert Verdict

Reviewed by the SuperArbor Pro Desk: choose this part when the existing component label and unit documentation match 49K03 and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.

FAQs

What is the Lennox 49K03 used for?

It is a valve for compatible Lennox HVAC equipment. Match the part number 49K03 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Features: R22 Refrigerant; Product Type: Valve. The replacement should match the existing component and the unit documentation.

How do I confirm this is the right replacement?

Compare the part number 49K03, the valve description, and any unit model references with the original component and the service manual.

Which equipment models are referenced in the fit data?

Captured fit data references models such as CB28UH-018-230-1, CB28UH-018-230-2, CB28UH-024-230-1, CB28UH-024-230-2, CB28UH-030-230-1, CB28UH-030-230-2. Treat this as a fitment aid and verify the complete model list in the equipment documentation.

Who should install this HVAC component?

A qualified HVAC technician should install and test the valve. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.

Safety and Installation Notes

Disconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.