Lochinvar SNA400-125, SNA500-125, SNR200-100, SNA285-125, SNR150-100 service manual Maintenance

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TM

Installation & Service Manual

12 Maintenance

￿WARNING

￿WARNING

￿WARNING

Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the water heater. Failure to perform the service and maintenance could result in damage to the water heater or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.

The water heater should be inspected annually only by a qualified service technician. In addition, the maintenance and care of the water heater designated in Table 12A and explained on the following pages must be performed to assure maximum water heater efficiency and reliability. Failure to service and maintain the water heater and system could result in equipment failure.

Electrical shock hazard – Turn off power to the water heater before any service operation on the water heater except as noted otherwise in this instruction manual. Failure to turn off electrical power could result in electrical shock, causing severe personal injury or death.

Address reported problems

1.Inspect any problems reported by the owner and correct before proceeding.

Inspect water heater area

1.Verify that water heater area is free of any combustible materials, gasoline and other flammable vapors and liquids.

2.Verify that air intake area is free of any of the contaminants listed in Section 1 of this manual. If any of these are present in the water heater intake air vicinity, they must be removed. If they cannot be removed, reinstall the air and vent lines per this manual.

Inspect water heater interior

1.Remove the front access cover and inspect the interior of the water heater.

Figure 12-1Condensate Trap

2" PVC CAP WITH

BLOCKED DRAIN SWITCH

RETAINING SCREW

CONDENSATE DRAIN

CONDENSATE FROM HEAT EXCHANGER

REMOVABLE CAP

TO CLEAN OUT TRAP

Clean condensate trap

1.Remove the clean out cap on the bottom of the trap. Let the condensate and any debris drain out.

2.Replace the clean out cap.

3.Fill with fresh water until the water begins to pour out of the drain.

4.Resume operation.

￿WARNING The condensate trap must be filled with water during all times of water heater

operation to avoid flue gas emission from the condensate drain line. Failure to fill the trap could result in severe personal injury or death.

Check all piping for leaks

￿WARNING Eliminate all system or water heater leaks. Leaking water may cause severe property

damage.

1.Inspect all water and gas piping and verify to be leak free.

2.Look for signs of leaking lines and correct any problems found.

3.Check gas line using the procedure found in Section 7 - Gas Connections.

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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 CSADetermine water heater location Installation must comply withCloset and alcove installations Before locating the water heater, check1Closet Installation Minimum Required Clearances Flooring and foundation Remove water heater from wood palletPrevent combustion air contamination 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 optionsVenting and combustion air CanadaVent pipe and fittings Air intake/vent connections Air inlet pipe materialsVent Length Removing from existing ventVent and air piping Vent/air termination sidewall If using the alternate sidewall terminationSidewall direct venting Vent Size2Clearance to Gravity Air Inlets Prepare wall penetrations Prepare wall penetrations Alternate Field Supplied OptionTermination and fittings Multiple vent/air terminations 5AMultiple Vent Terminations must also comply with -1ASidewall termination installation Sidewall termination optional concentric ventDescription and usage 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 AirScalding System pipingSystem water piping methods General piping informationPiping components Water chemistryDelta T Single Unit 3Multiple Units Water Tank Supply Connecting gas supply piping Gas connectionsNatural gas Propane gasNatural Gas Pipe Capacity Chart Check inlet gas supplyLength of Pipe in Straight Feet for 1/2 PSI Gas valve replacement Gas pressureField wiring 3Low Voltage Field Wiring Connections Inputs Condensate disposal Condensate drainStart-up Check for gas leaks Inspect/fill condensate systemFinal checks before starting the water heater Check system and water heater Start the water heaterIf water heater does not start correctly Check flame and combustion2Operating Instructions Models SNR150-100 -- SNA285-125 3Operating Instructions Models SNA400-125 -- SNA500-125 Operating information Temperature controlProtection features GeneralWater heater temperature regulation Adjustable control parametersSaving parameters Sequence of operation HTR IgnitionShield control module 1Control PanelStatus display screens Status Display ScreensStatus Display Screens cont’d Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check expansion tank Flue vent system and air pipingCheck water system Check water heater relief valveCheck control settings Check ignition ground wiring Check burner flameCheck all water heater wiring Check flame signalOiled bearing circulators Cleaning heat exchangerHandling ceramic fiber materials Niosh stated First AidCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does Not Modulate No DisplayNo Burner Operation Above 50%Checking temperature sensors Temperature F Resistance ΩTroubleshooting Flame SequenceNo Flame Ign GV/Relay No FlameRunning FailFan Low Manual ResetHigh Limit Fan Speed LowFan Speed High SwitchFan High Sensor OpenParameters ProgrLow 24 VAC Service BlkWatch Dog Error Write EEPromOr Obstruction Combustion Analysis ProcedureGas Valve Adjustment Gas Supply PressureModel SNA400-125 Gas valve adjustment procedureModels SNR150-100 -- SNA285-125 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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