Carrier HH18HA449 Temperature Actuated Switch (350F, M/R, SPST) Limit Switch

The Carrier HH18HA449 Temperature Actuated Switch (350F, M/R, SPST) Limit Switch is a Carrier limit switch for HVAC repair and replacement work. Use it when the part number HH18HA449 and the listed specifications match the equipment being serviced.

HH18HA449 is an official OEM Temperature Actuated Switch (350F, M/R, SPST) for Carrier HVAC equipment

Key Specs

• Product Type: Limit Switch

Fitment Notes

Captured equipment fit data references models including PG8DAA024050AAJA, PG8DAA024050ABJA, PG8DAA024050ACJA, PG8DAA024050ADJA, PG8DAA036050AAJA, PG8DAA036050ABJA, PG8DAA036050ACJA, PG8DAA036050ADJA. 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 HH18HA449 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 Carrier HH18HA449 used for?

It is a limit switch for compatible Carrier HVAC equipment. Match the part number HH18HA449 and the equipment service literature before ordering or installing.

Which specs should I verify before purchase?

Verify the spec set shown for this part: Product Type: Limit Switch. The replacement should match the existing component and the unit documentation.

How do I confirm this is the right replacement?

Compare the part number HH18HA449, the limit switch 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 PG8DAA024050AAJA, PG8DAA024050ABJA, PG8DAA024050ACJA, PG8DAA024050ADJA, PG8DAA036050AAJA, PG8DAA036050ABJA. 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 limit switch. 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.