Mestek j11r06778-004 Air Pressure Switch Xf Series

Product Description

The MESTEK j11r06778-004 is an air pressure switch designed as a standard alternate replacement for XF Series heating units in the 175,000 to 250,000 BTU/h input range. Air pressure switches monitor combustion air pressure to verify that the inducer motor is operating before allowing ignition to proceed. This switch is a safety control component installed by licensed HVAC technicians during routine service or equipment repair. It plays a critical role in preventing unsafe ignition conditions in induced-draft and forced-draft heating systems.

This switch is intended for use in commercial and residential heating applications where XF Series units rated between 175,000 and 250,000 BTU/h are installed. It serves as a standard alternate part, meaning it is a functionally equivalent substitute for the original pressure switch used in these units. Typical installation scenarios include seasonal maintenance replacements, troubleshooting induced-draft failures, and system component upgrades in light commercial or large residential heating systems.

Key Features

• Standard alternate replacement designed for XF Series 175,000 to 250,000 BTU/h units
• Monitors combustion air pressure to confirm inducer operation before ignition
• Safety control that prevents ignition under improper draft conditions
• OEM-style form and function for reliable drop-in service replacement

Compatibility

Designed as a standard alternate air pressure switch replacement for MESTEK XF Series heating units rated 175,000 to 250,000 BTU/h.

Installation Notes

Air pressure switches are installed by licensed HVAC technicians. Shut off all power to the unit at the disconnect before beginning service. Verify the inducer assembly and pressure tubing are free of blockages or cracks before installing the new switch, as a faulty hose or blocked port can cause a correctly functioning switch to trip or fail to close. Follow applicable local mechanical codes and the equipment manufacturer service instructions when performing the replacement.

Technical Specifications

• Application: XF Series 175,000 to 250,000 BTU/h heating units
• Component Type: Air pressure switch
• Replacement Type: Standard alternate

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: j11r06778-004