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.)

 

 

 

 

39

Page 38 Page 40
Image 39
Page 38 Page 40
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 DHW Settings Resetoutdoor Description See User Access Installer Access Display ModifyBMS Service Notification Software Version Temperature units C / FViewable and changeable control parameters Time and DateTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling BMS Thermostat Input Ramp SettingsControl modes Controlling SensorMinimum On/Off Time Cascade OffsetCirculation pumps Service Notification Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankInspect 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 ownerCheck the following TroubleshootingBefore troubleshooting Check control module fusesUnit 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
Related manuals
Manual 16 pages 54.19 Kb Manual 80 pages 32.08 Kb

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.
Top Page Image Contents