Lochinvar 400, 801 service manual Troubleshooting

Page 37

 

 

 

 

Service Manual

 

 

 

3 Troubleshooting (continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 3-4Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

 

 

 

 

 

 

 

 

 

 

FAULT

DESCRIPTION

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

• Reset the pressure switches.

 

 

 

 

 

 

 

• Measure the supply gas pressure to determine cause

 

 

 

 

of failure. Natural gas pressures should be between

 

 

 

 

4 - 14 inches w.c. and

LP gas

pressures

 

 

- Either the optional manual reset low gas

should be between 8 - 14 inches w.c.

 

 

 

Gas Pressure SW

pressure switch or the optional manual reset

• Refer to Section 7 - Gas Connections of the Knight

 

(will require a manual

high gas pressure switch tripped.

XL Installation and Operation

Manual

for

detailed

 

 

 

information concerning the gas supply.

 

 

 

reset once the condition

 

 

 

 

 

 

 

• Correct the supply gas pressure if necessary.

 

has been corrected. Press

 

 

 

the RESET button on the

 

 

• Check for a loose or misplaced jumper if pressure

 

SMART SYSTEM display

 

 

switches are not installed.

 

 

 

 

to reset.)

 

 

 

 

 

 

 

 

 

 

 

• Check for a loose or misplaced jumper on the Low

 

 

- The gas pressure switch contacts on the

Voltage Connection Board.

 

 

 

 

 

• Check for the addition of a device wired across the

 

 

Low Voltage Connection Board are open.

 

 

gas pressure switch terminals on the Low Voltage

 

 

 

 

 

 

 

 

Connection Board.

 

 

 

 

 

 

 

 

 

 

 

 

• Check boiler pump operation on a call for heat.

 

Flow Switch/

 

 

• Check for closed valves or obstructions in the boiler

 

- Either the optional flow switch or the optional

piping.

 

 

 

 

LWCO

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

 

(will require a manual

low water cutoff is not making.

 

purged from the system.

 

 

 

 

 

 

 

 

 

 

reset once condition has

 

 

• Check for loose or misplaced jumpers if flow switch or

 

been corrected. Press

 

 

 

 

 

LWCO is not installed.

 

 

 

 

the RESET button on the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMART SYSTEM display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to reset.)

- Blown fuse.

• Replace fuse F3 on the control board, see page 33

 

 

of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blocked Drain SW

 

 

• Check condensate tube from unit to floor drain for

 

(will require a manual

 

 

proper installation and obstructions.

 

 

 

 

 

• Inspect condensate trap for

blockage.

Clean if

 

reset once condition has

The blocked drain switch has detected

 

been corrected. Press

excessive condensate build up inside the

necessary.

 

 

 

 

the RESET button on the

• Check for loose wiring connection at wire harness

 

SMART SYSTEM display

unit.

plug.

 

 

 

 

to reset.)

 

 

• Bad blocked drain switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

37

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleGeneral Operation Access modesHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessParameter table Description See User Access Installer Access Display ModifyMenu DHW Settings Resetoutdoor Description See User Access Installer Access Display ModifyBMS Service Notification Viewable and changeable control parameters Temperature units C / FTime and Date Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Ramp SettingsControlling Sensor BMS Thermostat InputMinimum On/Off Time Cascade OffsetCirculation pumps Service Notification Service technician Maintenance Maintenance and annual startupOwner maintenance 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 electrodesCleaning boiler heat exchanger Check flame signalReview with owner Model Kit Part Component Number DescriptionBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit DoesTemperature Resistance Temperature Resistance Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyBoiler Pump System PumpTroubleshooting Open Temp SwAnti-cycling Flame Fail IgnFlame Sequence Cont’dOutlet Mrhl Outlet ArhlFan Speed Low Fan Low/HighHigh GV/RelaySensor Shorted FaultLouver Proving Inlet SensorFatal Error Flue Sensor FaultMemory Error Flue Temp DiffDelta T High Flue Temp HighOutlet Temp Watch Dog Error Service BlkNo Error Stored Rem Ctrl FltCombustion Analysis Procedure Model Gas valve adjustment procedureModels 601
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400, 801 specifications

The Lochinvar 801,400 is a cutting-edge solution in the realm of high-efficiency commercial water heating. This model represents a significant advancement in the design and functionality of water heaters, catering primarily to the demands of large-scale facilities like hotels, hospitals, and large industrial operations.

One of the standout features of the Lochinvar 801,400 is its impressive heating capacity, which can produce up to 801,400 BTUs, making it suitable for high-demand applications. This output is crucial for establishments that require a consistent supply of hot water, such as commercial kitchens and laundry facilities. The robust design ensures that it can handle peak demand periods without compromising performance.

Another significant aspect is the innovative use of advanced technology in its operation. The Lochinvar 801,400 integrates smart controls that enhance its efficiency and ease of operation. These controls allow for precise monitoring and adjustment of water temperatures, ensuring that the system operates within optimal parameters while maximizing energy savings. The intelligent monitoring system can provide real-time updates, making it easier for facility managers to keep track of performance and address maintenance needs proactively.

The construction of the Lochinvar 801,400 incorporates durable materials that not only enhance the longevity of the unit but also offer resistance to corrosion and wear. This durability translates into lower maintenance costs and an extended lifespan for the unit, making it a worthwhile investment for businesses.

Moreover, the Lochinvar 801,400 is designed with energy efficiency in mind. It boasts a high thermal efficiency rating, which reduces operational costs and minimizes the carbon footprint of heating operations. This efficiency is critical in today’s environmentally conscious market, where businesses are seeking to reduce their energy consumption and comply with strict regulations.

The design of the Lochinvar 801,400 also prioritizes safety, featuring innovative safety controls and fail-safes that protect both the unit and the users.

In summary, the Lochinvar 801,400 offers a combination of high capacity, advanced technology, durability, and energy efficiency, making it an excellent choice for commercial water heating solutions. As industries continue to evolve, the demand for reliable and efficient water heating solutions like the Lochinvar 801,400 will only increase.
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