Service Manual

3 Troubleshooting (continued)

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

• 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.

Outlet MRHL

 

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

(cont’d)

 

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

(will require a manual

The outlet water temperature has exceeded

• If operating on something other than an outlet sensor,

reset once the condition

has been corrected. Press

the setting of the manual reset high limit.

check temperature setting of the main control board.

• If the optional manual reset high limit has tripped,

the RESET button on the

 

SMART SYSTEM display

 

check setting of the device.

to reset.)

 

• Check resistance of water sensors and compare to

 

 

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

 

 

sensor if necessary.

 

 

• Replace high limit.

 

 

 

 

 

• Vent/air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

Fan Low/High

 

Knight Boiler Installation and Operation Manual for

 

proper lengths.

OR

 

• Check for obstruction or blockage in the vent/air

Fan Speed Low/

The actual fan RPM is 30% lower than what

High

is being called for.

intake pipes or at terminations.

• Check the wiring connections at the fan and at the

(will require a manual

 

reset once the condition

 

main control board.

has been corrected. Press

 

• Replace the fan.

the RESET button on the

 

 

• Replace the main control board.

SMART SYSTEM display

 

to reset.)

 

 

Blown fuse.

• Replace fuse F2 on the control board, see page 33

 

 

of this manual.

 

 

 

 

 

GV/Relay

 

• Check wiring harness connection at the gas valve and

 

at the main control board.

Fail

 

 

 

(will require a manual

The main control board did not detect the

• Replace the gas valve wire harness.

reset once the condition

 

has been corrected. Press

gas valve.

• Replace the gas valve.

the RESET button on the

 

 

 

SMART SYSTEM display

 

• Replace the main control board.

to reset.)

 

 

 

 

 

Sensor Open

 

• Check the sensors and their associated wiring.

(will require a manual

 

Repair or replace the sensor or wiring if damaged.

 

 

reset once the condition

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

has been corrected. Press

the RESET button on the

temperature sensor has been disconnected.

the resistance to the tables on page 35 of this

SMART SYSTEM display

 

manual.

 

 

to reset.)

 

• Replace the sensor if necessary.

 

 

 

 

 

41

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Lochinvar 81-286 service manual Fan Low/High, Fan Speed Low, GV/Relay, Fail, Sensor Open
Page 40 Page 42

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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