Lochinvar L100208502 Pump Relay Knight Xl KB399 KB800

Product Description

The LOCHINVAR L100208502 is a pump relay designed for use in high-efficiency condensing boiler systems. It controls the switching of the system circulation pump in response to signals from the boiler control, enabling proper sequencing of pump operation during heating cycles. This component is an OEM-specified part suited to commercial and residential hydronic heating applications. Licensed plumbers and HVAC technicians servicing Knight XL heating boilers will find this relay integral to maintaining correct pump control logic within the system.

This pump relay is specified for use with the Knight XL Model KB399 to KB800 heating boiler equipped with a 1.5 hp pump. It is used in hydronic heating installations where the boiler control board sends a low-voltage signal to energize or de-energize the circulation pump. Proper relay function ensures the pump operates only during appropriate demand conditions, protecting the heat exchanger and extending system life.

Key Features

• OEM-specified pump relay for Knight XL condensing boiler systems
• Controls circulation pump switching in hydronic heating applications
• Compatible with 1.5 hp pump configurations on KB399 to KB800 models
• Supports correct pump sequencing to protect the heat exchanger
• Direct replacement part for simplified serviceability

Compatibility

Designed for use with the Knight XL Model KB399 to KB800 heating boiler with a 1.5 hp pump.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber familiar with hydronic heating systems. Before servicing, shut off electrical power to the boiler at the disconnect switch and allow the system to cool. Follow all applicable local codes and the manufacturer service documentation when replacing relay components. Do not restore power until all wiring connections are verified secure and the access panel is reinstalled.

Technical Specifications

• Compatible System: Knight XL Model KB399 to KB800
• Compatible Pump Size: 1.5 hp
• Application: Hydronic heating boiler

Standard Information

• Brand: LOCHINVAR
• Manufacturer Part Number: L100208502