Lochinvar 399 - 800 Noisy, No Pump, Operation Boiler Pump, System Pump, DHW Pump, Relief Valve

Page 31

Service Manual

3Troubleshooting (continued)

Table 3E Troubleshooting Chart - Noisy System

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

- Supply gas problem. Natural gas pressures

• Refer to Section 7 - Gas Connections of the Knight

 

should be between 4 inches w.c. (1.0 kPa)

XL Installation and Operation Manual for detailed

 

and 14 inches w.c. (3.5 kPa). LP gas

information concerning the gas supply.

 

 

 

pressures should be between 8 inches w.c.

 

 

 

 

 

 

 

(2.0 kPa) and 14 inches w.c. (3.2 kPa).

 

 

 

 

 

 

 

 

 

 

 

- Gas/air mixture problem.

• Refer to the Gas Valve Adjustment Procedure

on

 

 

page 41 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 26 in this manual for the burner removal

 

and inspection procedure. Clean or replace the burner

Operation

 

 

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

 

 

(82.7 kPa).

 

 

 

 

 

 

 

No Pump

- Blown fuse.

• Replace fuse F5 on the control board, see page 28 of

this manual.

 

 

 

 

 

 

 

Operation -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Boiler Pump

- Faulty pump.

• Replace pump.

 

 

 

System Pump

 

 

 

 

 

 

 

or

- Internal fault on control board.

 

 

 

 

 

 

DHW Pump

• Replace main control board.

 

 

 

 

 

 

 

 

 

 

 

- Faulty pump relay.

• Replace relay.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- System pressure exceeds relief valve

• Lower

the

system

pressure below the

50

psi

Relief Valve

setting.

(344.7 kPa) rating of the supplied relief valve or replace

 

the standard relief valve with a higher rated valve up to

Opening

 

the maximum pressure of the heat exchanger.

 

 

 

 

• Improperly sized expansion tank.

 

 

 

 

 

 

 

 

 

 

31

Image 31
Contents Models 399 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceMenu / Exit UP Down Knight XL displayControl inputs Control outputs Smart Control ModuleSequence of operation General OperationHow the boiler operates How the control module operatesBLR Ignition Sequence of operationBLR SH 41% Rate Use this procedure to access menus from the display panel Display panel menu accessValue will appear Display panel parameter accessParameter table Temperature DataControl Circulation Service Viewable and changeable control parameters Temperature settingsFunctions DHW settingsOutdoor air reset Data loggingMinimum SH set point Maximum air temperatureShift reset curve Maximum SH set pointAnti-cycling Boiler cascade address Control modesSH controlling sensor SH sourceCascade offset Service NotificationCirculation pumps Service technician Maintenance Maintenance and annual startupOwner 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 settingsCleaning boiler heat exchanger Check flame signalReview with owner Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsSystem Pump NoisyNo Pump Operation Boiler PumpSequence Switch/LWCOFlow FlameNo Flame Ign Anti-cyclingRunning No FlameFan Speed Low Adjustable HighLimit w/Manual Fan LowSensor Shorted Fan HighFan Speed High Sensor OpenTemp O/Shoot Open Rem Ctrl FltParameters ProgrLow 24 VAC Service BlkWatch Dog Error No Error StoredGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or ObstructionModel Gas valve adjustment procedureModels 600 Page Page KBX-SER Rev E
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399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.