Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

APS:

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

• Air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

 

 

Knight XL Installation and Operation Manual for

 

 

proper lengths.

 

 

 

 

 

• Check for obstruction or blockage

in the

air

APS / HEX

 

intake pipes or at terminations.

 

 

 

• Check reference hoses connected to the air pressure

Temp Sw

 

switch for blockage or obstruction.

 

 

Open

Either the air pressure switch contacts are

• Inspect the burner. Reference page 31 of this manual

(will require a manual

reset once the condition

open, or the O-temp heat exchanger switch

for removal and cleaning procedures.

Replace if

necessary.

 

 

 

has been corrected.

has opened.

 

 

 

• Inspect the heat exchanger.

Reference page 32 of

Press the RESET button

 

 

this manual for removal and cleaning procedures.

on the SMART SYSTEM

 

 

Replace if necessary.

 

 

 

display to reset.)

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

O-TEMP HEX SWITCH

 

 

 

 

• Inspect the back of the inner combustion chamber at

 

 

burner level for refractory breakdown / missing.

 

 

Replace heat exchanger if refractory is broken and unit

 

 

has fired.

 

 

 

 

 

• Check continuity across two contacts. Wires should be

 

 

connected at both poles of the normally closed switch.

 

 

• Faulty O-Temp HEX Switch. Replace switch.

 

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

Anti-cycling

for heat too quickly after the previous call for

set time period.

 

 

 

heat has ended.

• The control board will release the call for heat if the

 

 

outlet temperature drops too quickly.

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

damage and connection. Reference page 31 of this

Flame Fail Ign

 

manual for removal and cleaning procedures.

(will require a manual

 

Replace if necessary.

 

 

 

 

• Check for proper electrical grounding of the unit.

 

reset once the condition

The unit has failed to prove main burner

 

has been corrected.

• Check incoming supply gas

pressure.

Natural

gas

Press the RESET button

ignition after four (4) attempts.

pressures should be between 4 - 14 inches w.c. and

on the SMART SYSTEM

 

 

LP gas pressures should be between 8 - 14 inches w.c.

display to reset.)

 

Refer to Section 7 - Gas Connections of the Knight

 

 

XL Installation and Operation Manual for detailed

 

 

information concerning the gas supply.

 

 

 

 

 

 

 

 

38

Page 37 Page 39
Page 38
Image 38
Lochinvar 400-801 service manual Temp Sw, Open, Anti-cycling, Flame Fail Ign
Page 37 Page 39

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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