Lochinvar 502 - 2072 Checking temperature sensors, Resistance Temperature, Temperature Resistance

Page 33

Copper-fin II/IIE Boiler, Water Heater and Pool 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

 

 

 

 

33

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Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid Service What is in this manual?Maintenance TroubleshootingCopper-fin display ServiceControl inputs Control outputs How the appliance operates General OperationHow the control module operates Sequence of operationOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Parameter table Datalogging Functions Settingsdhw ResetoutdoorAnti-cycle Delay Yes Viewable and changeable control parameters Temperature settings boiler onlyFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationService technician Maintenance Maintenance and annual startupOwner maintenance See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterCheck control settings Check all wiringInspect and clean burner Perform start-up and checksChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Inspect and clean the heat exchanger Review with ownerOiled bearing circulators Before troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotChecking temperature sensors Resistance TemperatureTemperature Resistance No Pump NoisyBoiler Pump System Pump DHW PumpFlow Switch Flame SequenceAnti-cycling No Flame Ign ErrorHSI Current Low Flame CKTNo Flame Auto ResetRunning High LimitInlet Low Manual ResetSensor Open Sensor ShortedTank Open Louver ProvingAPS Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Service BlkProgr Low VoltageNo Error Stored Watch Dog ErrorWrite EEProm Program EEProm
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502 - 2072, 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.

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