TM

Installation & Service Manual

13 Troubleshooting

Combustion Analysis Procedure

1.Press the SHUTDOWN button on the display until HTR:Off appears in the display window.

2.Remove the screws securing the top panel to the unit. Remove the panel from the unit to gain access to the flue sensor.

3.Locate the flue sensor in the top of the vent connection. Remove the flue sensor and grommet from the unit. Note: Combustion measurements will be made at this point.

4.Press the SHUTDOWN button on the display until HTR:Standby appears in the display window.

5.Locate the pinhole button above the “r” in the Lochinvar logo on the display board (FIG. 11-1). 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 water heater into Service Mode. In Service Mode the water heater 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 water heater has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 13G. 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 13G Flue 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, press the SHUTDOWN button on the display board (FIG. 11-1) to take the water heater out of Service Mode. The water heater will go to shutdown and the display will show HTR:Off.

9.Replace the flue sensor and grommet into the vent connection.

10.Replace the top panel on the unit.

11.Place the Shield water heater back into normal operation.

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

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

Table 13F Troubleshooting Chart - Combustion Levels

POSSIBLE CAUSE

CORRECTIVE ACTION

 

 

Vent/Air Intake Length

• Refer to Section 2 - General Venting for the proper venting and air intake methods for the

Shield water heater.

or Obstruction

• Check for obstructions at the vent/air intake terminals.

 

 

 

Gas Supply Pressure

• Refer to Section 7 - Gas Connections for the proper gas supply for the Shield water heater.

 

 

 

Dirty/Damaged Burner

• Refer to page 56 of this manual for burner removal and cleaning procedures.

• Replace burner if necessary.

 

 

 

Gas Valve Adjustment

• Refer to page 69 of this manual for the gas valve adjustment procedure.

 

 

 

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Lochinvar SNR150-100, SNA500-125 Combustion Analysis Procedure, Or Obstruction, Gas Supply Pressure, Dirty/Damaged Burner
Page 67 Page 69

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.
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