Modine 53658 Stalk Mount High Limit Switch L220-40F

Product Description

The MODINE 53658 is a stalk mount high limit switch designed for use in Modine unit heaters and power vented heating equipment. The switch carries an L220-40F rating, indicating it opens at 220 degrees F with a 40-degree F differential, protecting the heat exchanger and combustion components from overtemperature conditions. It is also cross-referenced as 3H0400780003 and 3H40078-3. This is an OEM-style replacement part installed by licensed HVAC technicians servicing commercial and industrial gas-fired unit heaters. The switch mounts via a stalk configuration, positioning the sensing element in direct contact with the airstream or heat exchanger surface for accurate limit detection.

The 53658 is used in gas-fired unit heaters found in commercial and industrial settings such as warehouses, garages, and manufacturing facilities. This switch applies to Modine BTS and PTP and PTS series unit heaters as well as HD and HDS series heaters, covering both hot surface ignition and direct spark ignition variants built before and after May 2007. Specific compatible models are listed in the compatibility section below.

Key Features

• Stalk mount design positions sensing element accurately within the heater assembly
• L220-40F rating: opens at 220 degrees F, resets at 180 degrees F
• Cross-referenced as 3H0400780003 and 3H40078-3
• Direct OEM replacement — replaces Modine part 5H0757690001
• Compatible with both hot surface ignition and direct spark ignition heater variants

Compatibility

Compatible with the following Modine models: BTS250, BTS300, HD30 Before 5/07 Hot Surface Ignition, HD30 After 5/07 Direct Spark Ignition, HD45 Before 5/07 Hot Surface Ignition, HD45 After 5/07 Direct Spark Ignition, HD125 After 5/07 Direct Spark Ignition, HDS30 Before 5/07 Hot Surface Ignition, HDS30 After 5/07 Direct Spark Ignition, HDS45 Before 5/07 Hot Surface Ignition, HDS45 After 5/07 Direct Spark Ignition, HDS60 Before 5/07 Hot Surface Ignition, HDS75 Before 5/07 Hot Surface Ignition, HDS125 After 5/07 Direct Spark Ignition, PTP250, PTP300, PTP350, PTP400, PTS250, PTS300, PTS350, PTS400. Replaces OEM part number 5H0757690001.

Installation Notes

Installation should be performed by a qualified HVAC technician. Disconnect all power and shut off the gas supply to the unit heater before removing or installing the high limit switch. Verify that the replacement switch matches the original L220-40F rating before completing the installation. After installation, restore power and gas supply, then confirm proper heater operation and limit switch function through a standard startup sequence.

Technical Specifications

• Switch Type: High Limit Switch
• Mount Style: Stalk Mount
• Limit Rating: L220-40F (opens at 220 degrees F, 40 degrees F differential)
• Alternate Part Numbers: 3H0400780003, 3H40078-3
• Replaces: 5H0757690001

Standard Information

• Brand: MODINE
• Manufacturer Part Number: 53658