State Industries STC-074 specifications Sequence, Top View

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SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

SBN SEQUENCE OF OPERATION

Sequence

1.Thermistors (probes) call for heat.

2.Inducer fan starts and provides draft.

3.Hot surface igniter = 20 sec. warmup.

4.Main gas valve opens 4 sec. trial for ignition. (Maximum 5 trials.)

5.Main burner ignites and proves.

6.Thermistors reach the temperature setting.

7.Main burners “OFF”

-Auto restart after 60 min.

-20 sec blower “interpurge” between trials

Top View

Draft Proving (Pressure) Switch Table

		Pressure Setting To
		Close Switch (Inches
SBN Models	Part No.	W.C.)
366	194411-0	(-) 1.60 ± .10"
275	194411-1	(-) 2.00" ± .10"
310	194411-2	(-) 1,75" ± .10"
120, 199, 250,	194411-3	(-) 2.40" ± .10"
400

154, 180, 199	194411-4	(-) 2.60" ± .10"

©2003

18

Technical Training Department

Ashland City, Tennessee

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Contents Service Handbook Table of Contents SBN Service Handbook Introduction Custom Commercial Storage Tank Model Number Break Down QualificationsTop and Front Views of Minimum Clearances To Combustibles Installation ConsiderationsRequired Exterior Clearances Exterior ClearanceComb AIR Make-Up Air Direct Communication Not Direct Vent Make-Up Air Horizontal Ducts Make-Up Air Vertical DuctsAir for Combustion Flammable Items Contaminated AirGas Valve Outlet View Venting Atmospheric Multiple Heaters VentingNine Rules for Good Vents SBN Tank Type Commercial GAS Water Heater Service Handbook SBN Tank Type Commercial GAS Water Heater Service Handbook Multiple Gas Fired Tank-Type Heaters Type B GAS VentTechnical Dataventing Top View SequenceFront View of Water Heater SBN Tank Type Commercial GAS Water Heater Service Handbook HSI Integrated Ignition Control Board HSI Lower Front View of SBN Water HeaterECO Wiring DiagramElectrical Sequence of SBN Water Heater Operation PRE-SERVICE Checklist Water Heater Control Ignition Control Board ConditionsTest 2 Polarity Check Flash Codes of Diagnostic IndicatorTest 3 Continuity Check High Limit ECO Test 2 Polarity CheckIs not present Test 4 Upper Temperature Probe Continuity CheckTest 3 Continuity Check of High Limit ECO Is indicatedWater Heater Control Test 5 Calling for Heat no Inducer OperationCheck to Inducer Test on Ignition Board 4 Pin Receptacle E4 VAC Check of Blower Prover/Low Gas Pressure Circuit Test 6 Inducer ON-NO IgnitionVoltage is not present between E4, Pin Test of Igniter and gas valve circuit Test 8 Igniter Heats no Main BurnerContinuity Check Of Gas Valve Coil Test 9 Igniter Heats no Main BurnerFlame Prover Circuit Check Test 10 Main Burner Ignition for Less than 5 SecondsIf… Then Test 11 Water Heater Shutting OFF below SettingDisplay Lights on Integrated Heater Control ECO SBN Tank Type Commercial GAS Water Heater Service Handbook Technical Training Department 120 154 180 199 200A 250A 275A 310A 366A 400A General Questions and Answers SBN Tank Type Commercial GAS Water Heater Service Handbook Draft Proving Pressure Switch Table