Service Manual

3Troubleshooting

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

Outlet water temperature has exceeded the

• Verify that the boiler pump is set to the proper speed

Temp O/Shoot

maximum outlet water temperature.

or that the boiler pump is the proper size. Reference

 

Section 6 - Hydronic Piping of the Knight

XL

(continued)

 

Installation and Operation Manual for boiler pump

 

 

specifications.

 

 

 

• Replace the main control board.

 

 

 

 

 

 

External control is cycling too often.

• Check set point of the external control.

 

Rem Ctrl Flt

 

• Check the wiring between the external control and the

 

unit.

 

 

 

 

 

 

• Replace the control.

 

 

 

 

Parameters

After downloading parameters from a laptop,

• Press the ENTER/RESET button on the SMART

the main control board must be reset.

SYSTEM display panel.

 

Progr

 

 

 

 

 

(will require a manual

 

 

 

reset once the condition

 

 

 

has been corrected. Press

 

 

 

the RESET button on the

 

 

 

SMART SYSTEM display

 

 

 

to reset.)

 

 

 

 

 

 

 

APS

Air pressure switch contacts are open.

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

Open

 

 

terminals.

 

(will require a manual

 

 

 

 

 

reset once the condition

 

• Vent/air intake lengths exceed the maximum allowed

has been corrected. Press

 

 

lengths. Refer to Section 3 - General Venting of the

the RESET button on the

 

 

Knight XL Installation and Operation Manual

for

SMART SYSTEM display

 

 

proper lengths.

 

to reset.)

 

 

 

 

 

 

 

• Check for obstruction or blockage in the vent/air

 

 

intake pipes or at terminations.

 

 

 

• Check reference hoses connected to the air pressure

 

 

switch for blockage or obstruction.

 

 

 

• Inspect the burner. Reference page 26 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

 

• Inspect the heat exchanger. Reference page 27 of this

 

 

manual for removal and cleaning procedures.

 

 

Replace if necessary.

 

 

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

 

38

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Image 38
Lochinvar 399 - 800 service manual Rem Ctrl Flt, Parameters, Progr, Open

399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.