Service Manual

 

 

 

3 Troubleshooting (continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3-4Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

 

 

 

 

 

 

 

 

 

 

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

• Reset the pressure switches.

 

 

 

 

 

 

 

• Measure the supply gas pressure to determine cause

 

 

 

 

of failure. Natural gas pressures should be between

 

 

 

 

4 - 14 inches w.c. and

LP gas

pressures

 

 

- Either the optional manual reset low gas

should be between 8 - 14 inches w.c.

 

 

 

Gas Pressure SW

pressure switch or the optional manual reset

• Refer to Section 7 - Gas Connections of the Knight

 

(will require a manual

high gas pressure switch tripped.

XL Installation and Operation

Manual

for

detailed

 

 

 

information concerning the gas supply.

 

 

 

reset once the condition

 

 

 

 

 

 

 

• Correct the supply gas pressure if necessary.

 

has been corrected. Press

 

 

 

the RESET button on the

 

 

• Check for a loose or misplaced jumper if pressure

 

SMART SYSTEM display

 

 

switches are not installed.

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

• Check for a loose or misplaced jumper on the Low

 

 

- The gas pressure switch contacts on the

Voltage Connection Board.

 

 

 

 

 

• Check for the addition of a device wired across the

 

 

Low Voltage Connection Board are open.

 

 

gas pressure switch terminals on the Low Voltage

 

 

 

 

 

 

 

 

Connection Board.

 

 

 

 

 

 

 

 

 

 

 

 

• Check boiler pump operation on a call for heat.

 

Flow Switch/

 

 

• Check for closed valves or obstructions in the boiler

 

- Either the optional flow switch or the optional

piping.

 

 

 

 

LWCO

• Verify system is full of water and all air has been

 

(will require a manual

low water cutoff is not making.

 

purged from the system.

 

 

 

 

 

 

 

 

 

 

reset once condition has

 

 

• Check for loose or misplaced jumpers if flow switch or

 

been corrected. Press

 

 

 

 

 

LWCO is not installed.

 

 

 

 

the RESET button on the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to reset.)

- Blown fuse.

• Replace fuse F3 on the control board, see page 33

 

 

of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blocked Drain SW

 

 

• Check condensate tube from unit to floor drain for

 

(will require a manual

 

 

proper installation and obstructions.

 

 

 

 

 

• Inspect condensate trap for

blockage.

Clean if

 

reset once condition has

The blocked drain switch has detected

 

been corrected. Press

excessive condensate build up inside the

necessary.

 

 

 

 

the RESET button on the

• Check for loose wiring connection at wire harness

 

SMART SYSTEM display

unit.

plug.

 

 

 

 

to reset.)

 

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

37

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Lochinvar 400-801 service manual Troubleshooting
Page 36 Page 38

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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