Lochinvar 402 - 2072 Checking temperature sensors, Resistance Temperature, Temperature Resistance

Page 35

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting (continued)

Checking temperature sensors

The appliance temperature sensors (inlet water, outlet water, system water, tank 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/Tank Sensor Resistance vs. Temperature

S1a Inlet/Outlet/System/Tank

 

 

S1b Outlet Only

 

 

(Wire Color - R and W)

 

 

 

(Wire Color - Bk and G)

 

 

 

 

 

 

 

 

 

 

Temperature

Resistance

Temperature

Resistance

 

Temperature

Resistance

Temperature

Resistance

50

19,553

158

2,004

 

50

40,030

158

3,478

68

12,690

176

1,464

 

68

25,030

176

2,492

86

8,406

194

1,084

 

86

16,090

194

1,816

104

5,715

212

816

 

104

10,610

212

1,344

122

3,958

 

 

 

122

7,166

 

 

140

2,786

 

 

 

140

4,943

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3C 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

 

 

 

 

35

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Contents Copper-fin II/IIE Boiler and Water Heater Models 402 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials Troubleshooting What is in this manual?Service MaintenanceCopper-fin display ServiceControl inputs Control outputs Sequence of operation General OperationHow the appliance operates How the control module operatesOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Only Parameter table a Boiler OperationAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Viewable and changeable control parameters Temperature settingsFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniter Check relief valveInspect/replace hot surface igniters Perform start-up and checks Check all wiringCheck control settings Inspect and clean burner2Adjusting air shutter 399,999 750,000 Btu/ hr Models Checking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Oiled bearing circulators Inspect and clean the heat exchangerReview with owner Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsResistance Temperature DHW Pump NoisyNo Pump Operation Boiler Pump System PumpAnti-cycling Flow SwitchFlame Sequence Flame CKT ErrorNo Flame Ign HSI Current LowHigh Limit Auto ResetNo Flame RunningSensor Shorted Manual ResetInlet Low Sensor OpenAPS Closed Louver ProvingTank Open APS OpenParameters Progr Temp O/ShootRem Ctrl Flt Low Voltage Service BlkWatch Dog Error No Error Stored
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402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
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