Service Manual

3 Troubleshooting (continued)

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 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

Boiler

Installation

and

Operation

Manual

 

 

for the proper piping methods for the Knight 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 Boiler 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

Boiler

Installation

and

Operation

Manual

 

for the proper piping methods for the Knight 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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Image 40
Lochinvar 81-286 service manual Outlet Arhl, Outlet Mrhl
Page 39 Page 41

81-286 specifications

Lochinvar 81-286 is a highly efficient and innovative heating solution that represents the latest advancements in boiler technology. This model, part of Lochinvar's prestigious line-up, is designed for commercial applications, delivering superior performance while emphasizing energy efficiency and user-friendly operation.

One of the standout features of the Lochinvar 81-286 is its robust construction. Built with high-quality materials, the unit is engineered for durability and reliability, ensuring long-term operation with minimal maintenance. Its compact design allows for versatility in installation, making it suitable for various building layouts and configurations.

The boiler's primary technology is its advanced condensing capability, which optimizes heat transfer and reduces energy consumption. By efficiently using the heat generated during combustion, the 81-286 can achieve higher thermal efficiencies, often surpassing traditional systems. This results in lower operating costs and reduced greenhouse gas emissions, aligning with the growing demand for sustainable energy solutions in commercial buildings.

Lochinvar incorporates intelligent control systems into the 81-286, featuring user-friendly interfaces that facilitate straightforward programming and monitoring. These control systems enable precise regulation of temperature and pressure, ensuring optimal operation while providing real-time feedback that aids in troubleshooting and maintenance. Users can enjoy the convenience of remote monitoring, enhancing the overall user experience.

Another key characteristic of the Lochinvar 81-286 is its capacity range. The model is available in various sizes, allowing it to meet the specific demands of different facilities, from small businesses to large industrial applications. This flexibility makes it a top choice for contractors and engineers seeking reliable heating solutions that cater to diverse needs.

In addition, the Lochinvar 81-286 boasts exceptional safety features, including built-in safeguards that protect against overheating and pressure surges. These aspects ensure that the unit operates within safe parameters, providing peace of mind for facility managers and operators.

In summary, the Lochinvar 81-286 combines durability, efficiency, and advanced technology, making it an ideal solution for commercial heating needs. With its innovative condensing design, intelligent controls, and safety features, this boiler stands out as a reliable choice for those seeking sustainable and effective heating solutions. Its versatility and performance make it a key player in today’s ever-evolving energy landscape.
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