Lochinvar 399 - 800 service manual Adjustable High, Limit w/Manual, Fan Low, Fan Speed Low

Models: 399 - 800

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Service Manual

3Troubleshooting (continued)

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

The outlet water temperature has exceeded

• Verify that the system is full of water and that all air

 

the setting of the high limit.

has been properly purged from the system.

 

 

 

• Verify that the boiler is piped properly into the heating

 

 

system. Refer to Section 6 - Hydronic Piping of the

 

 

Knight

XL

Installation

and Operation

Manual

 

 

for the proper piping methods for the Knight XL.

 

 

• Check voltage to boiler pump motor on a call for

 

 

heat. If voltage is not present, check wiring back to

Adjustable High

 

the pump relay.

 

 

 

 

 

• Replace the pump relay if necessary.

 

 

Limit w/Manual

 

 

 

 

 

 

 

 

 

 

 

Reset

 

• If 120 VAC is present on a call for heat and the boiler

(will require a manual

 

pump is not operating, replace the pump.

 

 

reset once the condition

 

• If the system pump is a variable speed pump, ensure

has been corrected. Press

 

 

that the system flow is not less than the boiler flow.

the RESET button on the

 

 

• If operating on either an inlet or system supply sensor,

SMART SYSTEM display

 

 

check temperature setting of the main control board.

to reset.)

 

 

 

 

 

 

 

 

 

 

 

• If the high limit has tripped, check setting of the

 

 

device.

 

 

 

 

 

 

 

 

• Check resistance of water sensors and compare to

 

 

Table 3B on page 30 of this manual. Replace sensor

 

 

if necessary.

 

 

 

 

 

 

• Replace high limit.

 

 

 

 

 

 

 

 

The actual fan RPM is 30% lower than what

• Vent/air intake lengths exceed the maximum allowed

 

is being called for.

lengths. Refer to Section 3 - General Venting of the

 

 

Fan Low

 

Knight

XL

Installation

and Operation

Manual for

 

proper lengths.

 

 

 

 

OR

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan Speed Low

 

• Check

for

obstruction

or

blockage in

the

vent/air

(will require a manual

 

 

intake pipes or at terminations.

 

 

reset once the condition

 

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

Blown fuse.

• Replace fuse F4 on the control board, see page 28 of

 

 

this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

35

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Lochinvar 399 - 800 service manual Adjustable High, Limit w/Manual, Fan Low, Fan Speed Low

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.