Lochinvar SNA400-125, SNA500-125, SNR200-100, SNA285-125, SNR150-100 Shield How it works, Blower

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TM

Installation & Service Manual

The Shield - How it works...

1.Access cover - front

Provides access to the gas train and heat exchanger.

2.Air intake adapter

Allows for the connection of the PVC air intake pipe to the water heater.

18.Heat exchanger inlet temperature sensor

This sensor monitors the inlet water temperature to the heat exchanger.

19.Heat exchanger outlet temperature sensor

This sensor monitors heat exchanger outlet water temperature.

3.Air pressure switch

The air pressure switch detects blocked inlet conditions.

4.Air shroud (500-125 Model Only_Not Shown)

The air shroud directs air and gas flow into the blower.

5.Blower

The blower pulls in air and gas through the venturi (item 5). Air and gas mix inside the blower and are pushed into the burner, where they burn inside the combustion chamber.

6.Burner (not shown)

Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and gas and provides a 5 to 1 firing rate.

7.Condensate drain connection

Connects the condensate drain line to 1/2" PVC.

8.Electronic Control Module

The electronic control responds to internal and external signals and controls the blower, gas valve, and pumps to meet the demand.

9.Electronic display

The electronic display consists of 7 buttons and a dual line 32- character liquid crystal display.

10.Flame inspection window

The quartz glass window provides a view of the burner surface and flame.

11.Flame sensor

Used by the control module to detect the presence of burner flame.

12.Flue gas sensor (not shown)

This sensor monitors the flue gas exit temperature. The control module will modulate and shut down the water heater if the flue gas temperature gets too hot. This protects the flue pipe from overheating.

13.Gas connection pipe

Threaded pipe connection, either 1/2", 3/4", or 1", depending on the model. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the water heater.

14.Gas shutoff switch (150-100 - - 285-125 Models Only)

An electrical switch designed to cut power from the gas valve to prevent gas flow to the burner.

15.Gas shutoff valve (400-125 -- 500-125 Models Only)

Manual valve used to isolate the gas valve from the gas supply.

16.Gas valve

The gas valve senses the negative pressure created by the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.

17.Heat exchanger access cover

Allows access to the combustion side of the heat exchanger coils.

20.High limit sensor

Device that monitors the outlet water temperature. If the temperature exceeds its setting, it will break the control circuit, shutting the water heater down.

21.Ignition electrode

Provides direct spark for igniting the burner.

22.Line voltage junction box

The junction box contains the connection points for the line voltage power.

23.Low voltage connection board

The connection board is used to connect external low voltage devices.

24.Low voltage wiring connections (knockouts)

Conduit entryway for the low voltage connection board.

25.Power cord

Six foot cord allows for quick connection to 120V supply.

26.Pump

Circulates water between the tank and the heat exchanger.

27.Pump relay

Switches power to the pump.

28.Relief valve discharge pipe

Protects the heat exchanger from over pressure and temperature conditions. The relief valve is set at 150 PSI.

29.Stainless steel heat exchanger

Allows water to flow through specially designed coils for maximum heat transfer, while providing protection against flue gas corrosion. The coils are encased in a jacket that contains the combustion process.

30.Tank sensor

Used by the control to monitor the temperature of the tank.

31.Top panel

Removable panel to gain access to the internal components.

32.Vent pipe connection

Allows for the connection of the PVC/CPVC vent pipe system to the water heater.

33.Venturi

The venturi controls air and gas flow into the burner.

34.Water heater drain valve

Location from which the water heater can be drained.

35.Water inlet

Copper sweat connection for cold water supply that returns water from the system to the heat exchanger, either 1-1/2" or 2", depending on the model.

36.Water outlet

Male NPT water connection that supplies hot water to the system, either 1-1/2" or 2", depending on the model.

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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 Remove water heater from wood pallet Flooring and foundationPrevent 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 optionsCanada Venting and combustion airVent pipe and fittings Air intake/vent connections Air inlet pipe materialsRemoving from existing vent Vent LengthVent and air piping If using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall Vent Size2Clearance to Gravity Air Inlets Prepare wall penetrations Alternate Field Supplied Option Prepare wall penetrationsTermination and fittings Multiple vent/air terminations 5AMultiple Vent Terminations must also comply with -1ASidewall termination optional concentric vent Sidewall termination installationDescription 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 AirSystem piping System water piping methodsScalding General piping informationWater chemistry Piping componentsDelta T Single Unit 3Multiple Units Water Tank Supply Connecting gas supply piping Gas connectionsNatural gas Propane gasCheck inlet gas supply Natural Gas Pipe Capacity ChartLength of Pipe in Straight Feet for 1/2 PSI Gas valve replacement Gas pressureField wiring 3Low Voltage Field Wiring Connections Inputs Condensate disposal Condensate drainCheck for gas leaks Inspect/fill condensate system Start-upFinal checks before starting the water heater 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 GeneralAdjustable control parameters Water heater temperature regulationSaving parameters Sequence of operation HTR IgnitionShield control module 1Control PanelStatus display screens Status Display ScreensStatus Display Screens cont’d Service technician Maintenance Maintenance and annual startupOwner maintenance 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 Sequence FlameNo Flame Ign 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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