Lochinvar 502 - 2072, 402 - 2072 service manual Flow Switch, Flame Sequence, Anti-cycling

Page 35

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

3 Troubleshooting (continued)

Table 3E Troubleshooting Chart - Fault Messages Displayed on Operator Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

- Either the optional manual reset low gas

• Reset the pressure switches.

 

pressure switch or the optional manual reset

 

 

high gas pressure switch tripped.

• Measure the supply gas pressure to determine

Gas Pressure SW

 

cause of failure. Refer to the Gas Connections

- Models 992 - 2072 (natural gas) - Automatic

Section of the Installation and Operation Manual for

(Will require a manual

Reset Low Gas is open.

detailed information concerning the gas supply.

reset once the condition

 

 

has been corrected.)

 

• Correct the supply gas pressure if necessary.

 

 

Flow Switch/

Either the flow switch or the optional low

• Check pump operation on a call for heat.

water cutoff is not making.

 

LWCO

 

• Check for closed valves or obstructions in the

(Lockout will reset

 

water piping.

automatically after

 

 

5 minutes or may be

 

• Verify system is full of water and all air has been

reset immediately once

 

purged from the system.

condition has been

 

 

corrected. Press the

 

 

RESET button on the

 

 

SMART SYSTEM display

 

 

to reset.)

 

 

 

 

 

Flame Sequence

The flame detector circuit is seeing a flame

• Check supply voltage for proper polarity.

signal while the gas valve is de-energized.

 

(Will require a manual

 

• Check that the gas valve is closed.

reset once the condition

 

 

has been corrected. Press

 

• Check external wiring for voltage feedback.

the RESET button on the

 

 

SMART SYSTEM display

 

• Check the internal wiring for bad connections.

to reset.)

 

 

 

 

• Replace main control board.

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after

 

for heat too quickly after the previous call for

a set time period.

Anti-cycling

heat has ended.

• The control board will release the call for heat if the

 

 

 

 

 

outlet temperature drops too quickly.

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Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater 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 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 NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterPerform start-up and checks Check all wiringCheck control settings Inspect and clean burnerChecking combustion air pressure Access to the burner will require the following stepsChecking 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 Not No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsResistance Temperature DHW Pump NoisyNo Pump 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 OpenRem Ctrl Flt Temp O/ShootLow Voltage Service BlkParameters ProgrProgram EEProm Watch Dog ErrorNo Error Stored Write 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.

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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