Lochinvar 2072, 402 service manual No Display, No Burner, Operation, Unit Does, Not Stage to, 100%

Page 34

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

3 Troubleshooting

Table 3A Troubleshooting Chart - No Display

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

Check external line switch, fuse, or breaker.

 

 

 

 

• Check position of ON/OFF switch. Turn switch to the

 

- No 120 VAC supplied to unit.

 

ON position.

 

 

 

 

 

• Check 120 VAC through the ON/OFF switch.

No

 

 

 

voltage through switch, replace switch.

 

 

 

 

 

 

No Display

 

• Check wiring harness connection between the display

- Bad wiring connection.

 

board and the main control board. Connect the harness

 

 

 

at both points.

 

 

 

 

 

 

 

 

 

- Blown fuse.

Replace fuse F6 on the main control board,

see

 

 

FIG. 3-1 on page 33 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace main control board.

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature setpoint

Review temperature setting.

 

 

 

 

satisfied.

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

No Burner

 

 

 

 

 

 

- Outside air temperature above Warm

Check location of outside air sensor.

Check

Operation

 

Weather Shutdown (WWSD) setpoint for

 

resistance of outdoor air sensor and compare to Table

 

main control board.

 

3C on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult display for specific fault.

Refer

to

fault

 

 

descriptions on pages 37 - 43 of this manual for

 

 

 

 

 

 

corrective actions.

 

 

 

 

 

 

 

 

 

 

Unit Does

- Boiler controlled by BMS.

 

 

 

 

 

 

• Check BMS parameter settings.

Optional PC

 

Not Stage to

- Outlet temperature too high.

 

software required.

 

 

 

100%

 

 

 

 

 

- Delta T too high.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

Image 34
Contents Copper-fin II/IIE Boiler and Water Heater Models 402 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Maintenance What is in this manual?Service TroubleshootingService Copper-fin displayControl inputs Control outputs How the control module operates General OperationHow the appliance operates Sequence of operationSequence of operation OUT 123.8F129HTR Postpurge Display panel menu access Display panel parameter access Parameter table a Boiler Operation OnlyAnti-cycle Time Anti Cycl Tm Parameter table B Water Heater Operation BMS Service Notification Pumps Temperature settings Viewable and changeable control parametersData logging FunctionsDHW settings Outdoor air reset boiler only Anti-cycling Control modes Building Management System BMS CascadeService Notification Circulation pumpsOwner maintenance Maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valveInspect/replace hot surface igniter Inspect and clean burner Check all wiringCheck control settings Perform start-up and checks2Adjusting air shutter 399,999 750,000 Btu/ hr Models Adjusting combustion air pressure Checking manifold gas pressurePressure Regulator Chamber Adjustment Manifold Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit DoesResistance Temperature Checking temperature sensorsTemperature Resistance Operation Boiler Pump System Pump NoisyNo Pump DHW PumpFlame Sequence Flow SwitchAnti-cycling HSI Current Low ErrorNo Flame Ign Flame CKTRunning Auto ResetNo Flame High LimitSensor Open Manual ResetInlet Low Sensor ShortedAPS Open Louver ProvingTank Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Progr No Error Stored Service BlkWatch Dog Error Low Voltage
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402, 2072 specifications

Lochinvar 2072,502 is an innovative and robust water-heating solution tailored for residential and commercial applications. This model represents a significant advancement in energy efficiency and performance, catering to the dynamic heating requirements of modern buildings.

One of the standout features of Lochinvar 2072,502 is its advanced thermal efficiency. With an impressive AFUE (Annual Fuel Utilization Efficiency) rating, the unit delivers exceptional heat output while minimizing energy consumption. This not only reduces utility bills for homeowners and businesses but also supports sustainability efforts by decreasing carbon footprints.

The Lochinvar 2072,502 incorporates cutting-edge technologies that set it apart in the market. It is equipped with advanced control systems that allow users to precisely manage heating outputs, ensuring optimal comfort while conserving energy. The user-friendly digital display provides real-time data, allowing for efficient monitoring and control.

Another significant characteristic of the Lochinvar 2072,502 is its robust stainless-steel construction. This feature enhances the unit's durability and longevity, ensuring reliable performance even in challenging conditions. The high-quality materials also contribute to maintaining consistent water temperatures, which is essential for both residential and commercial heating needs.

The Lochinvar 2072,502 operates silently, making it ideal for installations in areas where noise is a concern. Its compact design allows for flexible installation options, fitting seamlessly into various spaces, whether it’s a utility room, basement, or outdoor area.

Furthermore, the unit supports multiple venting options, accommodating different building architectures and layouts. This versatility makes it an ideal choice for new builds and retrofitting existing systems.

Maintenance is streamlined with the Lochinvar 2072,502, as it features a self-diagnostics system that simplifies troubleshooting. Regular service check-ups are made easier with accessible components, allowing technicians to perform maintenance tasks efficiently.

In summary, the Lochinvar 2072,502 stands out for its high efficiency, advanced technology, durability, and flexible installation options. It is an ideal choice for those seeking a reliable and technologically advanced water-heating solution that meets the challenges of contemporary heating demands while promoting energy savings and environmental responsibility.