Contents

HAZARD DEFINITIONS

2

Pipe Sizing for Natural Gas

25

PLEASE READ BEFORE PROCEEDING

3

Natural Gas Supply Pressure Requirements

............. 25

THE OUTDOOR KNIGHT XL -- HOW IT WORKS

4-6

Propane Gas

25

RATINGS

7

Pipe Sizing for Propane Gas

25

1. DETERMINE BOILER LOCATION

 

Propane Supply Pressure Requirements

25

Flooring and Foundation

9

Check Inlet Gas Supply

26

Prevent Combustion Air Contamination

9

Gas Pressure

27

Corrosive Contaminants and Sources

9

Gas Valve Replacement

27

2. PREPARE BOILER

 

5. FIELD WIRING

 

Remove Boiler from Wood Pallet

10

Line Voltage Connections

28

Install Flue Pipe Assembly

10-11

Low Voltage Connections

28-29

Gas Conversions

12

Wiring of the Cascade

30

Model 400

12

6. CONDENSATE DISPOSAL

 

Model 501

13

Condensate Drain

32

Models 601 - 801

13

7. STARTUP

33-38

Leveling the Boiler

13

8. OPERATING INFORMATION

 

3. HYDRONIC PIPING

 

General

39

System Water Piping Methods

14

Cascade

42

Low Water Cutoff Device

14

Sequence of Operation

43-44

Chilled Water System

14

Outdoor Knight XL Control Module

45

Freeze Protection

14

Status Display Screens

46-48

General Piping Information

14

9. MAINTENANCE

 

Flow Switch and Relief Valve Installation

15

Maintenance and Annual Startup

49-53

Flow Switch Adjustment

16

10. DIAGRAMS

 

Circulator Sizing

17

Wiring Diagram

54

4. GAS CONNECTIONS

 

Ladder Diagram

55

Connecting Gas Supply Piping

24

Revision Notes

Back Cover

Natural Gas

25

 

 

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

￿DANGER

￿WARNING

￿CAUTION CAUTION NOTICE

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.

2

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Lochinvar 400-801 operation manual Contents

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.