Lochinvar 400-801 Noisy, No Pump, Boiler Pump, System Pump, DHW Pump, Relief Valve, Opening

Page 36

 

 

 

 

Service Manual

 

 

 

 

 

3 Troubleshooting

 

 

 

 

 

 

 

 

 

 

 

 

Table 3-3Troubleshooting Chart - Noisy System

 

 

 

 

 

 

 

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

- Supply gas problem. Natural gas

• Refer to Section 7 - Gas Connections of the Knight

 

pressures should be between 4 inches

XL Installation and Operation Manual for detailed

 

w.c. and 14 inches w.c. LP gas pressures

information concerning the gas supply.

 

should be between 8 inches w.c. and 14

 

 

 

inches w.c.

 

 

 

- Gas/air mixture problem.

• Refer

to the Gas Valve Adjustment Procedure on

 

 

 

page 47 of this manual for the proper gas valve setting.

 

 

 

Verify that the vent/air intake lengths do not exceed the

 

 

 

maximum listed in the General Venting section of the

 

 

 

Knight XL Installation and Operation Manual.

 

 

 

 

Noisy

- Dirty/damaged burner.

• Refer to page 31 in this manual for the burner removal

Operation

 

 

and inspection procedure. Clean or replace the burner

 

 

as necessary.

 

 

 

 

 

 

 

 

 

- Low water flow through the heat exchanger.

• Refer

to Section 6 - Hydronic Piping of the

 

 

 

Knight XL Installation and Operation Manual for

 

 

 

minimum flow rates. Verify that the boiler is piped in a

 

 

 

primary/secondary fashion and that the boiler and

 

 

 

system pump are running on a call for heat.

 

 

 

 

 

- Air in the piping system.

• Properly purge all air from the piping system.

 

 

 

 

 

- Low system water pressure.

• Verify system pressure is a minimum of 12 psi.

 

 

 

 

No Pump

- Blown fuse.

• Replace fuse F1 on the control board, see page 33 of

Operation -

 

 

this manual.

Boiler Pump

 

 

Note:

Make sure pump amperage does not exceed

System Pump

 

 

or

 

 

1.8 amps.

DHW Pump

- Faulty pump.

• Replace pump.

 

 

 

 

 

 

- Internal fault on control board.

• Replace main control board.

 

 

 

 

 

- System pressure exceeds relief valve

• Lower the system pressure below the 30 psi rating of

Relief Valve

setting.

the supplied relief valve or replace the standard relief

 

 

valve with a higher rated valve up to the maximum

Opening

 

 

pressure of the heat exchanger.

 

 

 

• Improperly sized expansion tank.

 

 

 

 

 

36

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Contents Models 400 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler What is in this manual? ServiceMaintenance TroubleshootingService Near boiler pipingKnight XL display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsAccess modes General OperationHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Display panel menu access Button Screen Operation Display StatusDisplay panel parameter access Button Screen Status Operation DisplayDescription See User Access Installer Access Display Modify Parameter tableMenu Resetoutdoor ANTI-CYCLING See User Access Installer Access Display Modify DescriptionTemperature units C / F Viewable and changeable control parametersTime and Date Software VersionTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Cascade Offset Minimum On/Off TimeCirculation pumps Boiler Pump Delay DHW Pump DelayBoiler Pump Anti-Seize Delay DHW 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 Check ignition ground wiring Check all boiler wiringCheck control settings Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner Model Kit Part Component Number DescriptionTest procedure Test low water flow conditionsTroubleshooting Before troubleshootingCheck the following Check control module fusesNo Display No BurnerOperation Unit DoesChecking temperature sensors Temperature Resistance Temperature ResistanceWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNoisy No PumpBoiler Pump System PumpTroubleshooting Temp Sw OpenAnti-cycling Flame Fail IgnCont’d Flame SequenceOutlet Arhl Outlet MrhlFan Low/High Fan Speed LowHigh GV/RelayFault Sensor ShortedLouver Proving Inlet SensorFlue Sensor Fault Fatal ErrorMemory Error Flue Temp DiffFlue Temp High Delta T HighOutlet Temp Service Blk Watch Dog ErrorNo Error Stored Rem Ctrl FltCombustion 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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