Service Manual

3 Troubleshooting

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

• Inspect the heat exchanger. Reference page 32 of

 

 

this manual for the procedure on how to clean the flue

 

 

side of the heat exchanger.

 

 

 

 

 

• Inspect the flue sensor and associated wiring.

 

The stack temperature has exceeded the set

Measure the resistance of the flue sensor and

Flue Temp High

compare to Table 3-2D on page 35 of this manual.

parameters for the boiler.

Replace the sensor if necessary.

 

 

 

 

• Verify that the vent/air intake pipes are properly

 

 

installed and that there are no obstructions.

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

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

 

 

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 boiler.

 

 

• Check for 120 vac to the boiler pump motor on a call

Delta T High

The temperature rise across the heat

for heat. If voltage is not present, check the wiring

back to the main control board. Replace the main

 

exchanger has exceeded the set parameters

 

control board if necessary.

 

 

 

 

for the boiler.

 

 

 

 

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

 

 

 

 

pump is not operating, replace the pump.

 

 

 

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

 

 

or that the pump is the proper size. Reference

 

 

Section

6

- Hydronic

Piping of the

Knight

 

 

XL Installation and Operation Manual for boiler

 

 

pump specifications.

 

 

 

 

 

 

 

 

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

 

 

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 boiler.

 

 

• Check for 120 vac to the boiler pump motor on a call

 

 

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

Outlet Temp

Outlet water temperature has exceeded the

to the main control board. Replace the main control

board if necessary.

 

 

 

High

maximum outlet water temperature.

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

 

 

 

 

pump is not operating, replace the pump.

 

 

 

 

 

 

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

 

 

or that the boiler pump is the proper size. Reference

 

 

Section 6 - Hydronic Piping of the Knight XL

 

 

Installation and Operation Manual for boiler pump

 

 

specifications.

 

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

 

 

 

44

Page 43 Page 45
Page 44
Image 44
Lochinvar 400-801 service manual Flue Temp High, Delta T High, Outlet Temp
Page 43 Page 45

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.
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