Rcd hh12zb220 Limit Switch 3.125 Inches L220-40F

Product Description

The RCD hh12zb220 is a high-limit safety switch used in gas furnaces and forced-air heating systems to prevent overheating. When supply air temperatures exceed the rated threshold, the limit switch opens the control circuit and shuts down the burner, protecting the heat exchanger from thermal damage. Measuring 3.125 inches in length and rated at the L220-40F specification, this switch is a direct-replacement component installed by licensed HVAC technicians during routine maintenance and equipment repair.

This limit switch is suited for residential gas furnace applications where OEM-style replacement parts are required. It is commonly installed in forced-air furnace systems as part of the high-limit control circuit. The L220-40F designation indicates the trip and reset temperature characteristics, which technicians use to confirm correct fitment for the application. Compatible Carrier parts and accessories applications are noted in the product identification.

Key Features

• High-limit safety function opens control circuit on over-temperature condition
• L220-40F rating for defined trip and reset temperature points
• 3.125-inch body length for standard furnace mounting locations
• OEM-style replacement designed for Carrier HVAC heating systems
• Protects heat exchanger from thermal stress during blower or airflow failures

Compatibility

Identified as a Carrier parts and accessories replacement component for Carrier HVAC central air and switch parts applications. Designed as an OEM-style replacement for residential gas furnace high-limit control circuits.

Installation Notes

A licensed HVAC technician should install this limit switch. Shut off power to the furnace at the disconnect and set the thermostat to the off position before beginning any work. Limit switches are typically mounted to the furnace plenum or heat exchanger compartment and connected into the low-voltage control circuit. Do not bypass or jumper a limit switch to restore furnace operation, as this removes the primary overheat protection from the system.

Technical Specifications

• Length: 3.125 inches
• Temperature Rating: L220-40F

Standard Information

• Brand: RCD
• Manufacturer Part Number: hh12zb220