What is in this manual?

Service

Near boiler piping

• Typical system components

The Knight XL display

• Display panel readout, buttons and their functions

Control module inputs

• Control module inputs and options

Control module outputs

• Control module outputs and options

General

How the boiler operates

How the control module operates

Access modes -- user and installer

Sequence of operation -- Domestic Hot Water (DHW)/space heating

Control panel menu access

Accessing programming mode and locating menus (See separate guide covering the interface.)

Control panel parameter access

• Accessing and changing parameters from the display panel

Quick start information -- parameter table

An index of available adjustments and readouts, where to access them and where to find detailed information.

Knight XL operation

A: General

B: Temperature Setting

C: Data Logging

D: Functions

E: DHW Settings

F: Outdoor Reset

G: Anti-cycling

H: Control Modes

I: Circulation Pumps

J: Building Management System (BMS)

K: Service Notification

Service Manual

Maintenance

Service and maintenance schedules

Address reported problems

Inspect boiler area and boiler interior

Clean condensate trap

Check all piping for leaks

Check air openings

Flue vent system and air piping

Check water system

Check expansion tank

Check boiler relief valve

Inspect ignition electrode

Check ignition ground wiring

Check all boiler wiring

Check control settings

Perform start-up and checks

Check burner flame

Check flame signal

Check flue gas temperature

General maintenance

Review with owner

Cleaning boiler heat exchanger

Oiled bearing circulators

Troubleshooting

Troubleshooting table - No display

Checking temperature sensors

Sensor tables

Troubleshooting table - Fault messages displayed on boiler interface

Combustion analysis procedure

Gas valve adjustment procedure

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Lochinvar 400-801 service manual What is in this manual?, Service, Maintenance, Troubleshooting

400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

The Lochinvar 400-801 is equipped with advanced control technologies that enhance its performance. With its built-in SMART SYSTEM control, users can easily monitor and manage the boiler’s operations, optimizing performance while ensuring ease of use. This control system features a user-friendly interface that provides real-time data, including temperature settings, pressure readings, and operational status, allowing for quick diagnostics and efficient troubleshooting.

Safety is paramount in the design of the Lochinvar 400-801. The boiler includes a comprehensive safety system that incorporates multiple safety interlocks and a venting system that prevents backflow and ensures safe exhaust. Moreover, the unit is designed to operate with minimal noise, making it suitable for environments where noise reduction is crucial.

Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.