Ferguson Enterprises b1370155 Auxiliary Limit Switch

Product Description

The FERGUSON ENTERPRISES b1370155 is an auxiliary limit switch designed for residential gas furnace applications. It functions as a safety device, monitoring temperature at a designated point in the heat exchanger or plenum and cutting power to the burner or blower circuit when temperatures fall outside the 90-120 degrees F operating range. The auto-reset design allows the switch to restore normal operation once temperatures return to an acceptable level, without requiring manual intervention. Licensed HVAC technicians install this switch as a direct OEM-style replacement to restore proper overheat protection in forced-air heating systems.

This limit switch is suited for residential forced-air gas furnace systems where auxiliary overheat protection is required. It is commonly installed in systems where a secondary limit is needed to protect against high-temperature conditions caused by restricted airflow, blocked filters, or failed blower motors. Compatible models listed in manufacturer documentation include DSG0360904BXXAAA, DSG0360903DWDAAA, and AMH80704BXAA.

Key Features

• Auto-reset operation restores normal furnace function without manual reset after temperature normalizes
• Temperature rating of 90-120 degrees F provides auxiliary overheat protection within standard furnace operating parameters
• Auxiliary switch type adds a secondary layer of safety monitoring beyond the primary limit switch
• OEM-style replacement designed to restore factory safety performance
• Compact package dimensions of 9 x 6 x 5 inches for straightforward fitment in existing furnace cabinets

Compatibility

Compatible with models DSG0360904BXXAAA, DSG0360903DWDAAA, and AMH80704BXAA as listed in manufacturer documentation. Designed as an OEM-style auxiliary limit switch replacement for residential gas furnace systems.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect all power to the furnace at the disconnect switch and breaker before removing or installing any limit switch. Follow the furnace manufacturer wiring diagram for correct terminal connections. After installation, verify system operation through a full heating cycle and confirm the limit switch does not trip under normal airflow conditions before returning the system to service.

Technical Specifications

• Switch Type: Auxiliary Limit Switch
• Reset Type: Auto-Reset
• Temperature Rating: 90-120 degrees F
• Package Length: 9 inches
• Package Width: 6 inches
• Package Height: 5 inches

Standard Information

• Brand: FERGUSON ENTERPRISES
• Manufacturer Part Number: b1370155