Knox Sales Company HCL4400 Pb High Limit Control

Product Description

The KNOX SALES COMPANY HCL4400 PB is a high limit control device used in heating systems to protect equipment from overheating. High limit controls monitor temperature and interrupt system operation when a set threshold is exceeded, preventing heat exchanger damage and unsafe operating conditions. This component is typically installed by licensed HVAC technicians during system maintenance or as part of a troubleshooting and repair workflow on residential or light commercial heating equipment.

High limit controls are commonly found in forced-air furnaces and other heating appliances where temperature regulation is critical to safe operation. The HCL4400 PB serves as a safety cutout in the heat exchanger or plenum area, shutting down burner operation or blower circuits when temperatures rise beyond acceptable limits. It is a standard replacement part for HVAC service professionals performing preventive maintenance or responding to nuisance shutdowns and overheat faults.

Key Features

• Interrupts heating system operation upon reaching a preset temperature threshold
• Protects heat exchangers and related components from thermal damage
• Designed for use in residential and light commercial heating applications
• OEM-style replacement form factor for straightforward field installation

Compatibility

Designed as an OEM-style replacement high limit control for residential and light commercial forced-air heating systems. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always shut down the heating system and disconnect electrical power at the breaker before servicing any limit control. Verify the replacement part matches the temperature rating and mounting configuration of the original device before installation. Work should comply with applicable local mechanical and electrical codes.

Technical Specifications

• Part Type: High Limit Control

Standard Information

• Brand: KNOX SALES COMPANY
• Manufacturer Part Number: HCL4400 PB