Service Manual

3 Troubleshooting

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

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

• Check 120 vac supply to the transformer.

 

120 vac input to the main control board has

• Check wiring connections at the low voltage

Low 24 vac

terminal strip.

dropped below 80 vac.

 

 

• Check the wire size/length to remote devices.

 

 

 

 

• Replace the transformer.

 

 

 

Watch Dog Error

The main control board has detected an

• Replace the main control board.

 

internal fault.

 

Write EEProm

The main control board has detected an

• Replace the main control board.

internal fault.

 

CRC Parameters

The main control board has detected an

• Replace the main control board.

 

internal fault.

 

No Error Stored

The main control board has detected an

• Replace the main control board.

 

internal fault.

 

Combustion Analysis Procedure

1.Turn the main power off to the boiler by placing the “On/Off” switch in the OFF position.

2.Remove the flue temperature sensor from the flue pipe connection. Note: Combustion measurements will be made at this point.

3.Turn the main power on to the boiler by placing the “On/Off” switch in the ON position.

4.Place the boiler into the active position by pressing the RIGHT SELECT [ON] key (see page 7).

5.Locate the pinhole button below the RESET button on the display board (see page 7). Insert a thin wire (such as a paper clip) into the hole and press the button once and hold for 5 seconds to place the boiler into Service Mode. In Service Mode the boiler will fire at ignition speed and will then modulate up to full fire.

6.Insert the probe from a combustion analyzer into the hole left by the removal of the flue temperature sensor.

7.Once the boiler has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 3-5 above. The CO levels should be less than 150 ppm for a properly installed unit.

If the combustion is not within the specified range, reference the chart below for possible causes and corrective actions.

Table 3-5Flue Products

Natural Gas

Propane

 

 

 

 

CO2

O2

CO2

O2

8.0% - 10%

3.0% - 6.5%

9.0% - 11%

4.1% - 6.9%

 

 

 

 

8.Once the combustion analysis is complete, test the safety shutoff device by turning the manual shutoff switch to the OFF position and ensuring that the boiler shuts down and registers an alarm. Turn the manual shutoff switch to the ON position, reset the control, and return to Service Mode.

9.Turn the main power off to the boiler and replace the flue temperature sensor into the flue pipe connection.

10.Place the boiler back into normal operation.

￿WARNING You must replace the flue gas temperature sensor to prevent flue gas spillage into

the room. Failure to comply could result in severe personal injury, death, or substantial property damage.

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Lochinvar 81-286 service manual Combustion Analysis Procedure
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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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