Lochinvar 399 - 800 Combustion Analysis Procedure, Or Obstruction, Gas Supply Pressure

Page 40

Service Manual

3Troubleshooting

Combustion Analysis Procedure

1.Turn the main power off to the boiler by placing the “On/Off” switch in the OFF position.

2.Remove the flue temperature sensor from the flue pipe connection. Note: Combustion measurements will be made at this point.

3.Turn the main power on to the boiler by placing the “On/Off” switch in the ON position.

4.Place the boiler into the active position by pressing the SHUTDOWN button on the display board (see page 7) until BLR:Standby appears in the display window.

5.Locate the pinhole button above the “T” in the Knight logo on the display board (see page 7). Press the button once and hold for 5 seconds to place the boiler into Service Mode. In Service Mode the boiler will fire at ignition speed and will then modulate up to full fire.

6.Remove the flue temperature sensor. Insert the probe from a combustion analyzer into the hole left by the removal of the flue temperature sensor.

7.Once the boiler has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 11 above. The CO levels should be less than 150 ppm for a properly installed unit.

If the combustion is not within the specified range, reference the chart below for possible causes and corrective actions.

Table 3H Flue Products

Natural Gas

Propane

 

 

 

 

CO2

O2

CO2

O2

8.0% - 10%

3.0% - 6.5%

9.0% - 11%

4.1% - 6.9%

 

 

 

 

8.Once the combustion analysis is complete, test the safety shutoff device by turning the manual shutoff valve to the OFF position and ensuring that the boiler shuts down and registers an alarm. Open the manual shutoff valve, reset the control, and return to Service Mode.

9.Turn the main power off to the boiler and replace the flue temperature sensor into the flue pipe connection.

10.Place the boiler back into normal operation.

￿WARNING You must replace the flue gas temperature sensor to prevent flue gas spillage into the

room. Failure to comply could result in severe personal injury, death, or substantial property damage.

Table 3G Troubleshooting Chart - Combustion Levels

POSSIBLE CAUSE

CORRECTIVE ACTION

 

 

 

• Refer to Section 3 - General Venting of the Knight XL Installation and Operation Manual

Vent/Air Intake Length

for the proper venting and air intake methods for the Knight XL boiler.

or Obstruction

• Check for obstructions at the vent/air intake terminals.

 

 

Gas Supply Pressure

• Refer to Section 7 - Gas Connections of the Knight XL Installation and Operation

Manual for the proper gas supply for the Knight XL boiler.

 

 

 

Dirty/Damaged Burner

• Refer to page 26 of this manual for burner removal and cleaning procedures.

• Replace burner if necessary.

 

 

 

Gas Valve Adjustment

• Refer to page 41 of this manual for the gas valve adjustment procedure.

 

 

 

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Contents Models 399 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler What is in this manual? ServiceMaintenance TroubleshootingService Near boiler pipingKnight XL display Menu / Exit UP DownControl inputs Smart Control Module Control outputsGeneral Operation How the boiler operatesHow the control module operates Sequence of operationSequence of operation BLR IgnitionBLR SH 41% Rate Display panel menu access Use this procedure to access menus from the display panelDisplay panel parameter access Value will appearTemperature Data Parameter tableControl Circulation Service Temperature settings Viewable and changeable control parametersDHW settings Outdoor air resetData logging FunctionsMaximum air temperature Shift reset curveMaximum SH set point Minimum SH set pointAnti-cycling Control modes SH controlling sensorSH source Boiler cascade addressCascade offset Service NotificationCirculation pumps Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valveCheck ignition ground wiring Check all boiler wiringCheck control settings Inspect ignition and flame sense electrodesCleaning boiler heat exchanger Check flame signalReview with owner Troubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No BurnerOperation Unit Does NotChecking temperature sensors Temperature ResistanceNoisy No PumpOperation Boiler Pump System PumpSwitch/LWCO FlowFlame SequenceAnti-cycling No Flame IgnNo Flame RunningAdjustable High Limit w/ManualFan Low Fan Speed LowFan High Fan Speed HighSensor Open Sensor ShortedTemp O/Shoot Rem Ctrl Flt ParametersProgr OpenService Blk Watch Dog ErrorNo Error Stored Low 24 VACCombustion Analysis Procedure Gas Valve AdjustmentOr Obstruction Gas Supply PressureModel 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.
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