Lochinvar 400-801 service manual Cont’d, Flame Sequence

Page 39

Service Manual

3 Troubleshooting (continued)

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

The unit has failed to prove main burner

• Verify that the plastic hose from the gas valve to the air

 

ignition after four (4) attempts.

inlet is connected and is not damaged.

 

 

• Verify that the vent/air intake pipes are correctly

 

 

installed and that there are no obstructions.

 

 

• Check for 24 vac to the gas valve at the 2-pin

 

 

connection on the side of the main control board during

 

 

the ignition attempt. If no voltage is present, replace

 

 

the main control board.

 

 

• If 24 vac is present at the main control board, check

 

 

the wiring between the main control board and the gas

 

 

valve. Replace the wiring if necessary. Do not

 

 

disconnect the wiring from the gas valve and attempt to

Flame Fail Ign

 

measure voltage at that point. The main control board

 

can detect if the gas valve is not connected and will

(cont’d)

 

display the Gas Valve or Gas Valve Fail fault.

(will require a manual

 

• If 24 vac is present, check the outlet of the valve to

reset once the condition

 

ensure the valve is flowing gas. With a manometer

has been corrected.

 

connected to the outlet tap of the gas valve, when the

Press the RESET button

 

unit is in the prepurge period, there should be a

on the SMART SYSTEM

 

negative pressure present. When the valve is

display to reset.)

 

energized a change in pressure should occur. If the

 

 

pressure change does not occur, the gas valve is not

 

 

opening. Replace the gas valve.

 

 

• Inspect flame sensor and associated wiring.

 

 

Reference page 31 of this manual for removal and

 

 

cleaning procedures. Replace if necessary.

 

 

• Inspect and clean the heat exchanger as necessary.

 

 

Reference page 32 of this manual for cleaning

 

 

procedures.

 

 

• Inspect the burner. Reference page 31 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

• Replace the main control board.

 

 

 

Flame Sequence

 

• Check supply voltage for proper polarity.

(will require a manual

 

• Check external wiring for voltage feedback.

reset once the condition

The flame detector circuit is seeing a flame

• Check the flame rod and make sure it is clean.

has been corrected.

signal while no flame is present.

Press the RESET button

• Check the internal wiring for bad connections.

on the SMART SYSTEM

 

 

• Replace main control board.

display to reset.)

 

 

 

 

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Contents Models 400 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleHow the control module operates Access modesGeneral Operation How the boiler operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessDescription See User Access Installer Access Display Modify Parameter tableMenu Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifySoftware Version Temperature units C / FViewable and changeable control parameters Time and DateTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Cascade Offset Minimum On/Off TimeCirculation pumps DHW Pump Anti-Seize Delay Boiler Pump DelayDHW Pump Delay Boiler Pump Anti-Seize DelayService Notification Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valve Inspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsModel Kit Part Component Number Description Check flame signalCleaning boiler heat exchanger Review with ownerTest low water flow conditions Test procedureCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Wire Color R/BK and Y Wire Color G and YSystem Pump NoisyNo Pump Boiler PumpTroubleshooting Flame Fail Ign Temp SwOpen Anti-cyclingFlame Sequence Cont’dOutlet Mrhl Outlet ArhlGV/Relay Fan Low/HighFan Speed Low HighInlet Sensor FaultSensor Shorted Louver ProvingFlue Temp Diff Flue Sensor FaultFatal Error Memory ErrorFlue Temp High Delta T HighOutlet Temp Rem Ctrl Flt Service BlkWatch Dog Error No Error StoredCombustion Analysis Procedure Gas valve adjustment procedure ModelModels 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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