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 Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifyViewable and changeable control parameters Temperature units C / FTime and Date Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Minimum On/Off Time Cascade OffsetCirculation pumps DHW Pump Delay Boiler Pump DelayBoiler Pump Anti-Seize Delay DHW Pump Anti-Seize DelayService Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valve Check 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 DescriptionTest low water flow conditions Test procedureBefore troubleshooting TroubleshootingCheck the following Check control module fusesNo 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 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

The Lochinvar 400-801 is equipped with advanced control technologies that enhance its performance. With its built-in SMART SYSTEM control, users can easily monitor and manage the boiler’s operations, optimizing performance while ensuring ease of use. This control system features a user-friendly interface that provides real-time data, including temperature settings, pressure readings, and operational status, allowing for quick diagnostics and efficient troubleshooting.

Safety is paramount in the design of the Lochinvar 400-801. The boiler includes a comprehensive safety system that incorporates multiple safety interlocks and a venting system that prevents backflow and ensures safe exhaust. Moreover, the unit is designed to operate with minimal noise, making it suitable for environments where noise reduction is crucial.

Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.
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