Allied Air r01851a034 Auxiliary Limit Switch for Fan and Limit Control

Product Description

The Allied Air R01851A034 is an auxiliary limit switch designed for use with fan and limit control systems in residential and light commercial HVAC equipment. Auxiliary limit switches serve a critical safety function in forced-air heating systems. They monitor temperature at key points in the heat exchanger or plenum and send a signal to shut down the burner or blower if temperatures rise beyond a safe threshold. This helps prevent overheating, equipment damage, and potential fire hazards. HVAC technicians rely on properly functioning limit switches to keep furnaces and air handlers operating within safe temperature ranges at all times.

The R01851A034 is a direct replacement part built to Allied Air specifications, making it a reliable choice for service calls and scheduled maintenance on compatible Allied Air units. When an auxiliary limit switch fails, the furnace may short-cycle, fail to ignite, or shut down entirely. Replacing it with the correct OEM-matched component restores normal operation quickly and reduces callback risk. This switch integrates with the fan and limit control assembly, working alongside the primary limit switch to provide an added layer of overheat protection. It is the type of part HVAC professionals keep on their service vehicles for fast turnaround on common furnace faults.

The package dimensions are 4.0 inches by 4.0 inches by 4.0 inches, and the unit weighs 0.2 pounds, making it compact and easy to transport and store. Whether you are servicing a residential gas furnace or performing a preventive maintenance inspection, the Allied Air R01851A034 auxiliary limit switch is the correct replacement component for compatible fan and limit control applications.

• Auxiliary limit switch provides secondary overheat protection in forced-air heating systems
• Designed for use with Allied Air fan and limit control assemblies
• Compact and lightweight at 0.2 pounds for easy handling and storage on service calls

Product Highlights

The Allied Air R01851A034 auxiliary limit switch is an OEM-matched safety component for fan and limit control systems, offering reliable overheat protection and straightforward installation for HVAC service professionals.

Product Information

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: R01851A034

Technical Specifications

• Suitable For Use With: Fan and Limit Control
• Package Height: 4.0 inches
• Package Length: 4.0 inches
• Package Width: 4.0 inches
• Package Weight: 0.2 pounds