Lochinvar 399 - 800 No Display, No Burner, Operation, Unit Does Not, Modulate, Above 50%

Page 29

Service Manual

3Troubleshooting (continued)

Table 3A Troubleshooting Chart - No Display

FAULT

CAUSE

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

- No 120 VAC supplied to unit.

Check external line switch, fuse, or breaker.

 

 

 

 

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

 

 

 

ON position.

 

 

 

 

 

 

 

 

 

• Check 120 VAC through the ON/OFF switch.

 

 

• Check

wiring

harness

connection

between display

 

 

 

board

and

main

control

board.

Connect

 

 

 

harness at both points.

 

 

 

 

 

 

No Display

 

 

 

 

 

 

 

 

 

 

 

- No voltage through the switch.

Replace switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace the main control board.

 

 

 

 

 

 

 

 

 

 

- Blown fuse.

Replace fuse F3 on the main control board, see

 

 

 

page 28 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

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) set point for

 

resistance of outdoor air sensor and compare to Table

 

 

 

main control board.

 

3D on page 30 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

- Unit locked out on fault.

Consult display for specific fault.

Refer

to fault

 

 

 

descriptions on page 32 of this manual for corrective

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

- Ramp delay active.

Check ramp delay parameter settings. Optional PC

 

 

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See page 20 of this

 

 

 

manual for instructions on how to turn this feature off.

Unit Does Not

 

 

- Boiler controlled by BMS.

• Check BMS parameter settings. Optional PC

 

 

 

 

 

 

 

 

 

 

Modulate

 

 

software required.

 

 

 

 

 

 

Above 50%

 

 

 

 

 

 

 

 

 

 

 

- Flue sensor open.

Verify that the flue sensor is located in the flue outlet.

 

 

 

 

 

 

 

 

 

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

to Table 3C on page 30 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Image 29
Contents Models 399 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceMenu / Exit UP Down Knight XL displayControl inputs Control outputs Smart Control ModuleHow the boiler operates General OperationHow the control module operates Sequence of operationBLR Ignition Sequence of operationBLR SH 41% Rate Use this procedure to access menus from the display panel Display panel menu accessValue will appear Display panel parameter accessParameter table Temperature DataControl Circulation Service Viewable and changeable control parameters Temperature settingsOutdoor air reset DHW settingsData logging FunctionsShift reset curve Maximum air temperatureMaximum SH set point Minimum SH set pointAnti-cycling SH controlling sensor Control modesSH source Boiler cascade addressCirculation pumps Service NotificationCascade offset Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesReview with owner Check flame signalCleaning boiler heat exchanger Before troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature Resistance Checking temperature sensorsNo Pump NoisyOperation Boiler Pump System PumpFlow Switch/LWCOFlame SequenceNo Flame Ign Anti-cyclingRunning No FlameLimit w/Manual Adjustable HighFan Low Fan Speed LowFan Speed High Fan HighSensor Open Sensor ShortedTemp O/Shoot Parameters Rem Ctrl FltProgr OpenWatch Dog Error Service BlkNo Error Stored Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModels 600 Gas valve adjustment procedureModel Page Page KBX-SER Rev E
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399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.