Service Manual

3Troubleshooting

Checking temperature sensors

The boiler temperature sensors (inlet water, outlet water, system water, flue, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature. If the resistance of the sensor does not closely match its corresponding table, replace the sensor.

Table 3B - Inlet/Outlet System Sensor Resistance vs. Temperature

Temperature

Resistance

 

Temperature

Resistance

 

 

 

 

 

50

18,780

 

158

1,990

 

 

 

 

 

68

12,263

 

176

1,458

86

8,194

 

194

1,084

 

 

 

 

 

104

5,592

 

212

817

122

3,893

 

 

 

140

2,760

 

 

 

 

 

 

 

 

 

 

 

Table 3C - Flue Temperature Sensor Resistance vs. Temperature

 

 

 

 

 

 

Temperature

Resistance

 

Temperature

Resistance

 

 

 

 

 

68

14,773

 

176

1,707

 

 

 

 

 

86

9,804

 

194

1,266

 

 

 

 

 

104

6,652

 

212

952

 

 

 

 

 

122

4,607

 

230

726

 

 

 

 

 

140

3,252

 

248

560

 

 

 

 

 

158

2,337

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3D - Outdoor Air Sensor Resistance vs. Temperature

 

 

 

 

 

 

 

Temperature

Resistance

 

Temperature

Resistance

 

 

 

 

 

-50

490,813

 

20

46,218

 

 

 

 

 

-40

336,606

 

30

34,558

 

 

 

 

 

-30

234,196

 

40

26,099

 

 

 

 

 

-20

165,180

 

50

19,900

 

 

 

 

 

10

118,018

 

60

15,311

 

 

 

 

 

0

85,362

 

70

11,883

 

 

 

 

 

10

62,465

 

80

9,299

 

 

 

 

 

30

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Lochinvar 50-210 service manual Checking temperature sensors, Temperature Resistance

50-210 specifications

The Lochinvar 50-210 is a powerful and efficient boiler designed for residential and commercial heating applications. This model is a part of Lochinvar’s line of advanced heating solutions, known for their reliability, efficiency, and innovative technologies. The 50-210 offers a high thermal efficiency rating, ensuring that energy consumption is minimized while still providing excellent heating performance.

One of the standout features of the Lochinvar 50-210 boiler is its advanced control system. It is equipped with a user-friendly LCD display that allows easy access to system settings and real-time performance data. This technology enhances user experience, allowing for easy adjustments and monitoring, ensuring optimal performance based on specific heating needs.

The Lochinvar 50-210 is designed with a fully modulating burner, which means it can adjust its output to match the heating demand effectively. This feature not only provides superior comfort but also increases energy savings by preventing the boiler from running at full capacity when it's not necessary. Moreover, the modulating burner minimizes wear and tear, extending the lifespan of the unit.

In terms of safety, the Lochinvar 50-210 incorporates several features such as multiple temperature and pressure sensors, flame safeguard systems, and safety cut-off controls. These safeguard mechanisms ensure that the system operates safely and efficiently, providing peace of mind to users.

The construction of the Lochinvar 50-210 is robust, featuring high-grade stainless steel and a durable heat exchanger. This design helps resist corrosion, ensuring longevity and requiring minimal maintenance over the years. Additionally, its compact design allows for easier installation, making it suitable for various settings, even those with limited space.

Furthermore, the Lochinvar 50-210 operates quietly, which adds to its appeal for residential installations. Its environmental considerations are also noteworthy, with low emissions contributing to cleaner air quality.

Overall, the Lochinvar 50-210 is a sophisticated heating solution that blends efficiency, reliability, and advanced technology. With its user-friendly controls, modulating burner, safety features, and durable construction, it meets the heating demands of modern homes and commercial spaces, making it a top choice for those seeking dependable boiler performance.