Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

• Adjust the set point of the auto reset limit to a higher

 

 

setting up to a maximum of 200°F. Reference the

 

 

Knight XL Installation and Operation Manual for

 

 

adjusting procedures.

 

 

 

 

 

• 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 120 vac to boiler pump motor on a call for

 

 

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

 

The outlet water temperature has exceeded

the main control board.

 

 

 

Outlet ARHL

• Replace the main control board if necessary.

 

the setting of the automatic reset high limit.

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

 

 

 

 

pump is not operating, replace the pump.

 

 

 

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

 

 

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

 

 

• If operating on something other than an outlet sensor,

 

 

check temperature setting of the main control board.

 

 

• If the optional manual reset high limit has tripped,

 

 

check setting of the device.

 

 

 

 

 

• Check resistance of water sensors and compare to

 

 

Table 3-2A on page 35 of this manual. Replace

 

 

sensor if necessary.

 

 

 

 

 

• Replace high limit.

 

 

 

 

 

 

 

 

• Adjust the set point of the manual reset limit to a higher

 

 

setting up to a maximum of 210°F. Reference the

Outlet MRHL

 

Knight XL Installation and Operation Manual for

 

adjusting procedures.

 

 

 

(will require a manual

 

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

reset once the condition

The outlet water temperature has exceeded

has been properly purged from the system.

 

has been corrected.

• Verify that the boiler is piped properly into the heating

Press the RESET

the setting of the manual reset high limit.

system.

Refer to Section 6 - Hydronic Piping of the

button on the SMART

 

SYSTEM display to

 

Knight

XL

Installation

and

Operation

Manual

 

for the proper piping methods for the Knight XL boiler.

reset.)

 

 

 

 

 

 

 

 

 

 

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

 

 

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

 

 

the main control board.

 

 

 

 

 

 

 

 

 

 

 

40

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Page 40
Image 40
Lochinvar 400-801 service manual Outlet Arhl, Outlet Mrhl
Page 39 Page 41

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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