Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

• Check set point of the external control.

 

 

 

Rem Ctrl Flt

 

• Check the wiring between the external control and the

External control is cycling too often.

unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace the control.

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameters

 

 

 

 

 

 

 

 

Progr

 

 

 

 

 

 

 

 

(will require a manual

 

 

 

 

 

 

 

 

reset once the condition

After downloading parameters from a laptop,

• Press the ENTER/RESET button on the SMART

has been corrected. Press

the main control board must be reset.

SYSTEM display panel.

 

 

 

 

the RESET button on the

 

 

 

 

 

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

 

 

• Establish a heating load to remove the heat from the

 

 

boiler loop.

 

 

 

 

 

 

 

• 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.

 

 

 

 

 

Service Blk

While the unit is in Service Mode, the outlet

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

 

temperature has exceeded 185°F.

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

 

 

to the main control board. Replace the main control

 

 

board if necessary.

 

 

 

 

 

 

• 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.

 

 

 

 

 

 

 

 

 

 

 

 

• Check 120 vac supply to the transformer.

 

 

 

Low 24 vac

120 vac input to the main control board has

• Check wiring connections at the low voltage

dropped below 80 vac.

terminal strip.

 

 

 

 

 

 

• Check the wire size/length to remote devices.

 

 

 

 

• Replace the transformer.

 

 

 

 

 

 

 

 

 

 

 

Watch Dog Error

The main control board has detected an

• Replace the main control board.

 

 

 

 

 

internal fault.

 

 

 

 

 

 

 

Write EEProm

The main control board has detected an

• Replace the main control board.

 

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CRC Parameters

The main control board has detected an

• Replace the main control board.

 

 

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No Error Stored

The main control board has detected an

• Replace the main control board.

 

 

 

 

 

internal fault.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 44 Page 46
Page 45
Image 45
Lochinvar 400-801 Rem Ctrl Flt, Parameters Progr, Service Blk, Low 24 vac, Watch Dog Error, Write EEProm, CRC Parameters
Page 44 Page 46

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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