Service Manual

3Troubleshooting (continued)

Checking temperature sensors

The water heater temperature sensors (inlet water, outlet water, system water, and flue) 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 °F

Resistance Ω

Temperature °F

Resistance Ω

 

 

 

 

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 °F

Resistance Ω

Temperature °F

Resistance Ω

 

 

 

 

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

--

--

 

 

 

 

23

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Lochinvar 150 - 500 service manual Checking temperature sensors, Temperature F Resistance Ω

150 - 500 specifications

Lochinvar has established itself as a leader in the field of hydronic heating solutions, and the Lochinvar 150 - 500 series is a prime example of its commitment to innovation and efficiency. Designed primarily for commercial applications, this line of high-efficiency boilers is engineered to provide optimized performance, reliability, and cost-effectiveness.

One of the standout features of the Lochinvar 150 - 500 series is its robust construction. Built with a durable stainless-steel heat exchanger, these boilers offer superior resistance to corrosion, ensuring a longer lifespan and consistent performance over time. The advanced design of the heat exchanger also maximizes heat transfer, contributing to higher efficiency ratings.

In terms of technology, the Lochinvar 150 - 500 series incorporates the Concentric Venting System, which allows for flexible installation options and reduces the overall footprint required for the boiler setup. This system is particularly advantageous in commercial settings where space can be limited. The boilers are equipped with smart controls that provide real-time monitoring and diagnostics, allowing for easier maintenance and reducing downtime.

The series features a comprehensive modulation range, allowing the boilers to adjust their output based on the heating demand. This capability not only enhances efficiency but also lowers energy consumption, making it an eco-friendly choice for businesses seeking to reduce their environmental impact. The Lochinvar 150 - 500 boilers utilize innovative combustion technologies, including an integrated burner that ensures optimal combustion efficiency and reduced emissions.

Safety is a priority with the Lochinvar 150 - 500 series, which includes multiple safety features such as lockout protection, pressure switches, and high-temperature limit controls. These measures ensure that the unit operates safely under varying conditions, providing peace of mind for operators.

Additionally, the compact design of the Lochinvar 150 - 500 series allows for easy transportation and installation. Its lightweight structure enables it to be maneuvered through tight spaces typically found in commercial buildings, making it a versatile option for installers.

In summary, the Lochinvar 150 - 500 series is an excellent choice for anyone seeking a reliable, efficient, and technologically advanced boiler solution. With its durable construction, advanced features, and commitment to safety and efficiency, this series stands out as a trusted option in the competitive market of hydronic heating systems.