Contents

HAZARD DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2 PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . . 3 THE KNIGHT XL -- HOW IT WORKS . . . . . . . . . . . . . . . 4-6 RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. DETERMINE BOILER LOCATION

Provide Air Openings to Room . . . . . . . . . . . . . . . . . . . . 10 Flooring and Foundation . . . . . . . . . . . . . . . . . . . . . . . . 10 Residential Garage Installation . . . . . . . . . . . . . . . . . . . . 10 Vent and Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Prevent Combustion Air Contamination . . . . . . . . . . . . . . 10 Corrosive Contaminants and Sources . . . . . . . . . . . . . . . 11 Using an Existing Vent System to Install a New Boiler . . 11 Removing a Boiler from Existing Common Vent . . . . . . . 12

2. PREPARE BOILER

Remove Boiler from Wood Pallet . . . . . . . . . . . . . . . . . . 13 Gas Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Model 399 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Model 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Models 600 - 800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Leveling the Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. GENERAL VENTING

Direct Venting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-16 Install Vent and Combustion Air Piping . . . . . . . . . . . . . . 17

PVC/CPVC Vent Piping Materials . . . . . . . . . . . . . . . 17 Requirements for Installation in Canada . . . . . . . . . . . . . 17 Installing Vent or Air Piping . . . . . . . . . . . . . . . . . . . . . . . 17-18 PVC/CPVC Air Intake/Vent Connections . . . . . . . . . . . . . 18 Air Inlet Pipe Materials . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Stainless Steel Air Intake/Vent Connections . . . . . . . . . . 20 Min./Max. Combustion Air & Vent Piping Lengths . . . . . . 21 Vent and Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Optional Room Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-22

4. SIDEWALL DIRECT VENTING

Vent/Air Termination - Sidewall . . . . . . . . . . . . . . . . . . . . 23-26

Determine Location . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25

Prepare Wall Penetrations . . . . . . . . . . . . . . . . . . . . . 25-26

Termination and Fittings . . . . . . . . . . . . . . . . . . . . . . . 26

Multiple Vent/Air Terminations . . . . . . . . . . . . . . . . . . 26

Sidewall Termination - Optional Concentric Vent . . . . . . 27-29

5. VERTICAL DIRECT VENTING

Vent/Air Termination - Vertical . . . . . . . . . . . . . . . . . . . . . 30-31

Determine Location . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Prepare Roof Penetrations . . . . . . . . . . . . . . . . . . . . . 31

Termination and Fittings . . . . . . . . . . . . . . . . . . . . . . . 31

Multiple Vent/Air Terminations . . . . . . . . . . . . . . . . . . 31 Vertical Termination - Optional Concentric Vent . . . . 32-33

6. HYDRONIC PIPING

System Water Piping Methods . . . . . . . . . . . . . . . . . . . . 34

Low Water Cutoff Device . . . . . . . . . . . . . . . . . . . . . . . . . 34

Chilled Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Freeze Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

General Piping Information . . . . . . . . . . . . . . . . . . . . . . . 34

Flow Switch and Relief Valve Installation . . . . . . . . . . . . 35

Flow Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . 36

Circulator Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Near Boiler Piping Connections . . . . . . . . . . . . . . . . . . . 36

Near Boiler Piping Components . . . . . . . . . . . . . . . . . . . 38

7. GAS CONNECTIONS

Connecting Gas Supply Piping . . . . . . . . . . . . . . . . . . . . 41

Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Pipe Sizing for Natural Gas . . . . . . . . . . . . . . . . . . . . 42

Natural Gas Supply Pressure Requirements . . . . . . . 42

Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Pipe Sizing for Propane Gas . . . . . . . . . . . . . . . . . . . 42

Propane Supply Pressure Requirements . . . . . . . . . . 42

Check Inlet Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Gas Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 44

8. FIELD WIRING

Line Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 45

Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 46

Wiring of the Cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

9. CONDENSATE DISPOSAL

 

Condensate Drain

49

10. STARTUP

50-55

11. OPERATING INFORMATION

 

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58-59

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Knight XL Control Module . . . . . . . . . . . . . . . . . . . . . . . . 61-62

Status Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . 63-66

12. MAINTENANCE

 

Maintenance and Annual Startup

67-71

13. DIAGRAMS

 

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Revision Notes . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

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.

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Lochinvar 399 operation manual Contents

399 specifications

Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 is a cutting-edge boiler designed for commercial heating applications. With its robust construction and high efficiency, this model stands out in the crowded market of heating solutions.

One of the main features of the Lochinvar 999 - 750 is its exceptional thermal efficiency rating. The unit incorporates advanced condensing technology that allows it to recover heat from flue gases, which helps in achieving efficiency levels of up to 99%. This efficiency not only reduces energy consumption but also lowers operational costs, making it an excellent investment for businesses looking to minimize their carbon footprint.

The boiler is designed to provide a powerful output of 750 kW, ensuring it meets the heating demands of larger buildings or commercial spaces. Its capacity makes it suitable for a range of applications including schools, hospitals, and industrial facilities. Moreover, the unit features a built-in cascading system that enables multiple boilers to be connected, enhancing system reliability and flexibility.

In terms of technology, the Lochinvar 999 - 750 is equipped with a user-friendly touchscreen interface. This innovative control system allows operators to monitor and adjust settings with ease, providing real-time performance data and alerts for maintenance needs. The intelligent controls optimize operation to match the heating load, further enhancing energy efficiency.

Safety is a top priority with this model. It is built with multiple safety features such as automatic shut-off valves, pressure relief valves, and flame monitoring systems, ensuring safe operation under various conditions. The unit also adheres to stringent industry standards and regulations, making it a reliable choice for commercial applications.

Furthermore, the Lochinvar 999 - 750 is designed with serviceability in mind. Its compact footprint and accessible components simplify maintenance, reducing downtime and associated costs. The unit also supports a variety of fuel sources, including natural gas, propane, and biodiesel, providing flexibility to meet different facility requirements.

In summary, the Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 represents a blend of efficiency, reliability, and safety in commercial heating. Its advanced technologies and thoughtful design make it a powerful solution for various heating needs, making it an ideal choice for businesses aiming for excellence in energy management and operational efficiency.