Lochinvar SNR200-100, SNA500-125, SNA285-125, SNR150-100, SNA400-125 Natural gas, Propane gas

Page 36

TM

Installation & Service Manual

7Gas connections

￿WARNING

￿WARNING

￿WARNING

Failure to apply pipe sealing compound as detailed in this manual can result in severe personal injury, death, or substantial property damage.

Shield water heaters are typically shipped ready to fire on natural gas. Check the water heater rating plate to determine which fuel the water heater is set for. In order to operate on LP gas contact the factory, an orifice MUST BE installed or a gas valve adjustment MUST BE made. Failure to comply could result in severe personal injury, death, or substantial property damage.

Use two wrenches when tightening gas piping at water heater (FIG. 7-3), using one wrench to prevent the water heater gas line connection from turning. Failure to support the water heater gas connection pipe to prevent it from turning could damage gas line components.

Natural gas:

Pipe sizing for natural gas

1.Refer to Table 7A for pipe length and diameter. Based on rated water heater input (divide by 1,000 to obtain cubic feet per hour).

a.Table 7A is only for natural gas with specific gravity 0.60 inches, with a pressure drop through the gas piping of 0.50 inches w.c.

b.For additional gas pipe sizing information, refer to ANSI Z223.1 (or B149.1 for Canadian installations).

Natural gas supply pressure requirements

1.Pressure required at the gas valve inlet pressure port:

•Maximum 14 inches w.c. with no flow (lockup) or with water heater on.

•Minimum 4 inches w.c. with gas flowing (verify during water heater startup).

2.Install 100% lockup gas pressure regulator in supply line if inlet pressure can exceed 14 inches w.c. at any time. Adjust lockup regulator for 14 inches w.c. maximum.

Figure 7-3Inlet Pipe with Backup Wrench

Propane gas:

￿WARNING

Shield water heaters are typically shipped ready to fire on natural gas. Check water heater rating plate to determine which fuel the water heater is set for. In order to operate on LP gas contact the factory, an orifice MUST BE installed or a gas valve adjustment MUST BE made. Failure to comply could result in severe personal injury, death, or substantial property damage.

USE BACK UP WRENCH

TO PREVENT PIPE FROM

ROTATING

NOTICE

Maximum inlet gas pressure must not

exceed the value specified. Minimum

 

 

value listed is for the purposes of input

 

adjustment.

￿WARNING Ensure that the high gas pressure regulator is at least 10 feet upstream of

the appliance.

Pipe sizing for propane gas

1.Contact gas supplier to size pipes, tanks, and 100% lockup gas pressure regulator.

Propane Supply Pressure Requirements

1.Adjust propane supply regulator provided by the gas supplier for 14 inches w.c. maximum pressure.

2.Pressure required at gas valve inlet pressure port:

•Maximum 14 inches w.c. with no flow (lockup) or with water heater on.

•Minimum 8 inches w.c. with gas flowing (verify during water heater startup).

36

Page 35 Page 37
Image 36
Page 35 Page 37
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 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 If using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall 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 AirSystem piping System water piping methodsScalding 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 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 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 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 Flame SequenceNo 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.
Top Page Image Contents