State Industries SUF-130- 300/400/500 Checking The Firing Rate, High Altitude Installations

Page 52

Figure 57

Checking The Firing Rate

If firing rate adjustment is required follow these instructions to determine the actual firing rate of the water heater:

1.Ensure there are no other gas fired appliances connected to the gas meter firing during this test.

2.Contact the gas supplier to determine the heating value, in Btu per cubic foot, of the gas supply.

3.Connect a manometer to the manifold gas pressure tap. Follow the instructions for Initial Start Up on page 52.

4.Start the water heater and ensure it is firing.

5.Check the manifold gas pressure, refer to Table 4 on page 52 for correct pressure. See Manifold Gas Pressure Adjustment on page 52 if adjustment is necessary.

6.Locate the gas meter serving the water heater.

7.Time how long (in seconds) it takes for one cubic foot of gas to be used while the water heater is firing with a stop watch.

8.Use the formula below to “clock” the gas meter and determine the actual firing rate of the water heater based on the heating value (Btu per cubic foot) of the gas supply:

3600 x H = Btu/hr

T

Example:

3600

x 1050 = 300,000 Btu/hr (87.9 kW)

12.6

 

3600 = seconds in one hour.

T = time, in seconds, to burn one cubic foot of gas.

H = heating value of gas in Btu per cubic foot.

Btu/hr = actual firing rate of the water heater.

Note: 1050 Btu per cubic foot is a standard value for natural gas. Standard propane gas Btu content is 2500 Btu per cubic foot. Btu values may change in certain areas and at high elevations. Check with the local gas utility company.

To Turn Off Gas

1.Change the Operating Set Point to the lowest temperature setting, see Operating Set Point And Differential Adjustment on page 52.

2.When the water heater has completed its shut down sequence and enters the standby mode, turn the water heater’s on/off switch to the “off” position.

3.Push in the gas control knob slightly and turn to the “off” position, see Figure 56 on page 52 and Figure 57 on this page.

4.Close the Main Gas Shutoff Valve, see Figure 52 on page 52.

High Altitude Installations

Fire and Explosion Hazard

Under no circumstances should the input exceed the rate shown on the water heater’s rating label.

Overfiring could result in fire or explosion.

Gas and carbon monoxide detectors are available.

Breathing Hazard - Carbon Monoxide Gas

Under no circumstances should the input exceed the rate shown on the water heater’s rating label.

Overfiring could result in damage to the water heater and sooting.

Gas and carbon monoxide detectors are available.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

The water heaters covered by this manual are certified for use without modification for altitudes up to 10,000 feet.

Most gas utility companies de-rate their gas for high altitudes, making it unnecessary to install high altitude orifices.

For installations above 10,000 feet call the technical support phone number listed on the back cover of this manual for further technical assistance. Call the local gas or utility company to verify Btu per cubic foot content before calling for technical assistance and have that information available.

Note: The actual firing rate of the water heater must not exceed the input rating on the water heater's rating label under any circumstances.

Note: Due to the input rating reduction at high altitudes, the output rating of the appliance is also reduced and should be compensated for in the sizing of the equipment for applications.

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Contents Commercial gas water heaters Table Of Contents ANSI/NSF-5 Safe Installation, Use and ServiceOptional General Safety Information PrecautionsHydrogen Gas Flammable Overheated water can cause water tank explosionInstalling, using or servicing Water heater Fire and Explosion HazardPreparing For The Installation IntroductionAbbreviations Used QualificationsFeatures And Components Basic OperationTop View Water Heater’s 120 VAC on/off switchTop View Components Side Views Installation Considerations Rough In DimensionsRecovery Capacities Gas Line Connection SizeService Clearance Locating The Water HeaterClearance To Combustible Materials Intake Air and Vent Pipe ClearancesExtended Vent Terminations Optional Concentric TerminationsHard Water Circulation PumpsInstallation Requirements Power SupplyGas Pressure Requirements Supply Gas LineMixing Valves Dishwashing MachinesClosed Water Systems Thermal ExpansionTemperature-Pressure Relief Valve Valve Discharge Pipe RequirementsCondensate Drain Combustible Material StorageContaminated Air Condensate Drain Water TrapUnconfined Space Air RequirementsConfined Space Fresh Air Openings For Confined Spaces Outdoor Air Through Two OpeningsOutdoor Air Through One Opening Outdoor Air Through Two Horizontal DuctsPage Commonwealth of Massachusetts InspectionGeneral Venting Information Venting InstallationGeneral Venting Instructions Venting Requirements Power Vent Installation Venting Installation SequenceDirect Vent Installation Vertical Termination Installation 3 ReducerVertical Termination Direct Vent Sidewall Termination Installation Concentric Termination Installation Inch Concentric Termination Flat Roof ClearanceInch Concentric Termination Installation Inch Concentric Termination KITInch Concentric Termination Sidewall Installation TWO Concentric Terminations Three Concentric TerminationsFour Concentric Terminations Eight Concentric TerminationsTwo Concentric Terminations Multiple Concentric Termination ArrangementsEight Concentric Terminations Venting Arrangements Power Vent HorizontalDirect Vent Horizontal Direct Vent Horizontal Vent Vertical Intake Direct Vent Vertical Vent Horizontal IntakeDirect Vent Horizontal Concentric Termination Clearances Sidewall Power Vent Power VentTermination Clearances Sidewall Direct Vent Direct VentWater Heater Installation Condensate Drain InstallationInstallation Notes Installation InstructionsSupply Gas Line Installation Gas Line SizingSupply Gas Line Sizing U. S. Units Supply Gas Line Sizing Metric UnitsGas Line Leak Testing Supply Gas Regulator InstallationGas Line Connection Electrical Wiring Power Supply ConnectionsEnable/Disable Circuit Connecting An External Supervisory ControlWater Piping Diagrams Water Line ConnectionsValve Discharge Pipe Thermometers not SuppliedTemperature Regulation High Temperature Limit Control ECOHigh Temperature Applications Thermostat ControlControl System Operation OverviewControl System Navigation User Input ButtonsStatus Icons Icon DescriptionOperating States State DescriptionControl System Menus Menu DescriptionUser Settings & Control System Menus Update CancelBack Help Description/Action DisplayChange Back Help Display Settings Description/Action Heater Information Description/Action DisplayBack Advanced View Back HelpECO YESUpdate Service Contact InformationSelect Back Help NamePrior to Start up Start UpInitial Start Up Multiple Appliance Installations Supply Gas Pressure AdjustmentManifold Gas Pressure Adjustment High Altitude Installations Checking The Firing Rate1050 = 300,000 Btu/hr 87.9 kW To Turn Off GasLighting & Operation Label Lighting The Water HeaterHoneywell Installation Checklist TroubleshootingSequence Of Operation Sequence Of Operation Flow Chart Closed by control system Fault Msg is displayedPre-Purge cycle Water is heated to VAC Gas ValveOperational Problems Installation ErrorsRough Starting, Rough Operation Momentary IgnitionFault And Alert Conditions Fault And Alert Messages Possible Causes Check/Repair Displayed Fault/Alert MessageBlower Prover Failure No Anode VoltageMaintenance Maintenance ScheduleGeneral Draining And FlushingSediment Removal Filling The Water HeaterLime Scale Removal Powered Anode Rods Drain Valve and Access PanelsTemperature-Pressure Relief Valve Test Vent SystemDiagrams CCB Central Control Board LayoutSUF 130 300 Wiring Diagram User Interface ModulSUF 130 400, 500 Wiring Diagram UserCirculation Pump Wiring Diagrams Water Piping Diagrams Temperature & Pressure Tank Temperature ALT. Cold Water State Storage Tank Water Piping Diagrams Line Temperature Control HOT Water Outlet Pipe T&P to Open Drain Finished Floor Limited Warranty