Service Manual

3Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

• Vent/air intake lengths exceed the maximum allowed

 

 

 

 

 

lengths. Refer to Section 3 - General Venting of the

Fan High

 

 

 

 

Knight XL Installation

and Operation

Manual for

 

 

 

 

proper lengths.

 

 

OR

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan Speed High

 

 

 

 

• Check for obstruction

or blockage in

the vent/air

(will require a manual

 

 

 

 

The actual fan RPM is 30% higher than what

intake pipes or at terminations.

 

reset once the condition

 

is being called for.

 

 

 

 

 

has been corrected. Press

 

 

 

 

• Check the wiring connections at the fan and at the

the RESET button on the

 

 

 

 

 

 

 

 

main control board.

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

 

 

 

to reset.)

 

 

 

 

• Replace the fan.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

• Check the sensors and their associated wiring.

Sensor Open

 

 

 

 

Repair or replace the sensor or wiring if damaged.

 

 

 

 

 

 

 

(will require a manual

 

 

 

 

• Measure the resistance of the sensors and compare

reset once the condition

Either the

inlet water or

outlet

water

has been corrected. Press

temperature sensor has been disconnected.

the resistance to the

tables on page

30 of this

manual.

 

 

the RESET button on the

 

 

 

 

 

 

 

 

 

 

 

 

 

SMART SYSTEM display

 

 

 

 

• Replace the sensor if necessary.

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sensor Shorted

 

 

 

 

• Check the sensors and their associated wiring.

 

 

 

 

Repair or replace the sensor or wiring if damaged.

(will require a manual

 

 

 

 

 

 

 

 

 

 

 

reset once the condition

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

has been corrected. Press

the RESET button on the

temperature sensor has been shorted.

the resistance to the tables on page 30 of this

SMART SYSTEM display

 

 

 

 

manual.

 

 

 

 

 

 

 

 

 

to reset.)

 

 

 

 

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Aux. Proving

 

 

 

 

 

 

 

(will require a manual

 

 

 

 

• Check function of remote devices.

 

reset once the condition

 

 

 

 

 

An optional

remote proving

switch

is not

 

 

 

has been corrected. Press

• Check for loose or misplaced jumper

if auxiliary

the RESET button on the

making.

 

 

 

 

 

 

proving switch is not installed.

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

 

Sensors equipped with an internal limit (such

• Check the tank temperature.

 

Tank Open

as the Lochinvar Squire® Indirect Tank), the

• Repair or replace the sensor wiring if damaged.

 

limit has opened due to temperature (195°F)

 

 

 

 

or the sensor has become disconnected.

• Replace the sensor if necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

36

Page 36
Image 36
Lochinvar 399 - 800 service manual Fan High, Fan Speed High, Sensor Open, Sensor Shorted, Aux. Proving, Tank 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.