State Industries SBD71 120, SBD85 500 manual SBD Sequence of Operation

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SBD TANK TYPE HEATERS

SERVICE HANDBOOK

SBD SEQUENCE OF OPERATION

1.Thermostat calls for heat

7.Thermostat satisfies

3.Intermittent Ignition Control

9.Flue damper closes

2.Flue damper opens

4.Pilot gas opens, Pilot sparks and flame proves

6. Main burner ignites

5. Main gas valve opens	8. Main and pilot
	burners "OFF"

SEQUENCE OF OPERATION

To understand SBD tank type water heaters, an examination of their sequence of operation is necessary.

When the thermostat calls for heat, the relay in the draft hood assembly activates the flue damper motor. The damper opens and power flows to the IID (Intermittent Ignition Device). This activates the IID module to open the pilot valve and begin sparking at the pilot burner assembly. Once the pilot flame is established and confirmed back to the IID, the sparking is stopped and the main gas valve is opened, allowing gas flow to the main burner. When the thermostat satisfies, main and pilot gas is shut off. Damper is returned to closed position.

Technical Training Department	16
Ashland City, TN ©2003

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Contents SandBlaster SBD Handbook SBD Tank Type Heaters Service HandbookModel Breakdown SBD 85 500 P E a CGA D Clearances from Combustibles InstallationClearance to Combustibles Table ModelExterior Clearance Minimum AIR for Combustion Cubic Feet of AIR PER 1,000 BTUSquare Inch Per 4,000 Btuh MAKE-UP AIRDirect Communication Horizontal Ducts Vertical DuctsBackdraft Insufficient MAKE-UP AIRAIR for Combustion Contaminated AIRNatural Gas Propane Gas GAS Pressure RequirementsSBD GAS Valve Atmospheric, Single, and Multiple Heaters Venting Nine Rules for Good Vents Nine Rules for Good Vents Power Vent Kits for Sidewall Venting Sequence of Operation SBD Sequence of OperationSBD Electrical Sequence 115/60/12A SBD Electrical Sequence of OperationThen Troubleshooting SBD Water HeatersTest the Transformer Ground 24 VAC FM Transformer High LIMIT, Left Terminal TestTest High Limit Right Terminal After Push in Reset 24 VAC is now presentReasons For Resetting Condition Cause Solution Check the PC Board Inspect the DamperPC Board Motor Test Service Switch Motor LeadThermostat Test Effikal Damper Adapter Service Motor Plug Switch Lead Heater HarnessNormal Operation Harness ChartTest for 24VAC Between Black Common and Brown Heater Harness Function Damper HarnessTest for 24VAC Between Black and Yellow Test for 24VAC Between Black and OrangeTest Between Black Common and Brown on the Damper Board Troubleshooting the Effikal DamperService Switch A1 is CORRECT, Check Service Switch PositionAdjust END Switch to CAM Contact Wire Harness Test IID Module Test Pilot Spark Test Power To Module May Be Interrupted To ResetSBD 120 400 GAS Valve Pilot Valve OHM TestPilot GAS Manifold Pressure TAP Blue White RED Pilot Valve Test SBD 500 onlyMain Burner Test Flame Rectification Flame RectificationPilot is lit Sparking has stopped Main GAS Valve Check Main GAS Valve Coil Check SBD 500 only Main GAS Valve Coil CheckGeneral Service Chart General Questions and Answers Series 110/111 SBD Models 120 Thru 500ASBD Models 120 Thru 500A Series Series Parts Description Pilot Burner, LP 193314-3 CGA Manifold 76244 76244-2 195121-1 98185-2 Component Part Information Name Specifications State Part NumbersSBD Service Checklist Water Piping Author Terry Mulder CommentsCommercial

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