Lochinvar SNR150-100 Combustion Analysis Procedure, Or Obstruction, Gas Supply Pressure

Page 68

TM

Installation & Service Manual

13 Troubleshooting

Combustion Analysis Procedure

1.Press the SHUTDOWN button on the display until HTR:Off appears in the display window.

2.Remove the screws securing the top panel to the unit. Remove the panel from the unit to gain access to the flue sensor.

3.Locate the flue sensor in the top of the vent connection. Remove the flue sensor and grommet from the unit. Note: Combustion measurements will be made at this point.

4.Press the SHUTDOWN button on the display until HTR:Standby appears in the display window.

5.Locate the pinhole button above the “r” in the Lochinvar logo on the display board (FIG. 11-1). Insert a thin wire (such as a paper clip) into the hole and press the button once and hold for 5 seconds to place the water heater into Service Mode. In Service Mode the water heater will fire at ignition speed and will then modulate up to full fire.

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

7.Once the water heater has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 13G. 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 13G 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, press the SHUTDOWN button on the display board (FIG. 11-1) to take the water heater out of Service Mode. The water heater will go to shutdown and the display will show HTR:Off.

9.Replace the flue sensor and grommet into the vent connection.

10.Replace the top panel on the unit.

11.Place the Shield water heater back into normal operation.

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

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

Table 13F Troubleshooting Chart - Combustion Levels

POSSIBLE CAUSE

CORRECTIVE ACTION

 

 

Vent/Air Intake Length

• Refer to Section 2 - General Venting for the proper venting and air intake methods for the

Shield water heater.

or Obstruction

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

 

 

 

Gas Supply Pressure

• Refer to Section 7 - Gas Connections for the proper gas supply for the Shield water heater.

 

 

 

Dirty/Damaged Burner

• Refer to page 56 of this manual for burner removal and cleaning procedures.

• Replace burner if necessary.

 

 

 

Gas Valve Adjustment

• Refer to page 69 of this manual for the gas valve adjustment procedure.

 

 

 

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Contents Installation & Service Manual What to do if YOU Smell GASContents Please read before proceeding Hazard definitionsShield How it works BlowerModels SNR150-100 -- SNA285-125 Model SNA400-125 Model SNA500-125Ratings CSAInstallation must comply with Closet and alcove installationsDetermine water heater location Before locating the water heater, check1Closet Installation Minimum Required Clearances Prevent combustion air contamination Flooring and foundationRemove water heater from wood pallet Do not install the Shield water heater into 3Combustion Air Direct from Outside Minimum Recommended Combustion AIR Supply to Equipment Room General venting Direct venting optionsVent pipe and fittings Venting and combustion airCanada Air intake/vent connections Air inlet pipe materialsVent and air piping Vent LengthRemoving from existing vent If using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall Vent Size2Clearance to Gravity Air Inlets Termination and fittings Prepare wall penetrationsPrepare wall penetrations Alternate Field Supplied Option Multiple vent/air terminations 5AMultiple Vent Terminations must also comply with -1ADescription and usage Sidewall termination installationSidewall termination optional concentric vent 9Concentric Vent Dimensional Drawing 12Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations 2Vertical Terminations with Multiple Water HeatersVertical termination installation Vertical termination optional concentric vent6Concentric Vent Roof Installation Multiventing vertical terminationsConventional and sidewall venting 1Vertical Direct Venting w/Room AirSystem piping System water piping methodsScalding General piping informationDelta T Piping componentsWater chemistry Single Unit 3Multiple Units Water Tank Supply Connecting gas supply piping Gas connectionsNatural gas Propane gasLength of Pipe in Straight Feet for 1/2 PSI Natural Gas Pipe Capacity ChartCheck inlet gas supply Gas valve replacement Gas pressureField wiring 3Low Voltage Field Wiring Connections Inputs Condensate disposal Condensate drainFinal checks before starting the water heater Start-upCheck for gas leaks Inspect/fill condensate system Start the water heater If water heater does not start correctlyCheck system and water heater Check flame and combustion2Operating Instructions Models SNR150-100 -- SNA285-125 3Operating Instructions Models SNA400-125 -- SNA500-125 Temperature control Protection featuresOperating information GeneralSaving parameters Water heater temperature regulationAdjustable control parameters Sequence of operation HTR IgnitionShield control module 1Control PanelStatus display screens Status Display ScreensStatus Display Screens cont’d Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check water heater relief valveCheck ignition ground wiring Check burner flame Check all water heater wiringCheck control settings Check flame signalCleaning heat exchanger Handling ceramic fiber materialsOiled bearing circulators Niosh stated First AidTroubleshooting Before troubleshootingCheck control module fuses Check the followingNo Display No Burner OperationUnit Does Not Modulate Above 50%Checking temperature sensors Temperature F Resistance ΩTroubleshooting No Flame Ign FlameSequence No Flame RunningGV/Relay FailManual Reset High LimitFan Low Fan Speed LowSwitch Fan HighFan Speed High Sensor OpenParameters ProgrService Blk Watch Dog ErrorLow 24 VAC Write EEPromCombustion Analysis Procedure Gas Valve AdjustmentOr Obstruction Gas Supply PressureGas valve adjustment procedure Models SNR150-100 -- SNA285-125Model SNA400-125 Model SNA500-125Diagrams 120 VACLOW Voltage

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.
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