State Industries SBD85 500 manual Troubleshooting SBD Water Heaters, Test the Transformer, Then

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SBD TANK TYPE HEATERS

SERVICE HANDBOOK

TROUBLESHOOTING SBD WATER HEATERS

To troubleshoot a SBD water heater check that:

•120 VAC is supplied to the heater

•the tank is full of water

•gas is supplied to the unit

STEP 1

TEST THE TRANSFORMER

STEP 1 - TO TEST THE TRANSFORMER - Using a multimeter, test for 24 VAC between the secondary transformer terminals.

IF	THEN
The meter does not read 24 VAC:	• Check that the 120 VAC is supplied
	from the On/Off Switch – if not, replace
	switch.
	• Check that the 120 VAC is supplied
	from transformer.
The meter reads 24 VAC:	• Go to step 2.

Technical Training Department	19
Ashland City, TN ©2003

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Contents

SandBlaster SBD Tank Type Heaters Service Handbook SBD HandbookModel Breakdown SBD 85 500 P E a CGA D Model InstallationClearances from Combustibles Exterior Clearance AIR for Combustion Cubic Feet of AIR PER 1,000 BTU Excess AIRMAKE-UP AIR Direct CommunicationVertical Ducts Horizontal DuctsInsufficient MAKE-UP AIR BackdraftContaminated AIR AIR for CombustionSupply Gas Manifold Pressure Tap Dirt Leg Gas Port GAS Pressure RequirementsSBD GAS Valve Venting Atmospheric, Single, and Multiple HeatersNine Rules for Good Vents Nine Rules for Good Vents Power Vent Kits for Sidewall Venting SBD Sequence of Operation Sequence of OperationSBD Electrical Sequence SBD Electrical Sequence of Operation Then Troubleshooting SBD Water HeatersTest the Transformer High LIMIT, Left Terminal Test Ground 24 VAC FM TransformerTest High Limit Right Terminal Damper MotorInspect the Damper Check the PC BoardService Switch Motor Lead PC Board Motor TestThermostat Test Effikal Damper Harness Chart Normal OperationTest for 24VAC Between Black Common and Brown Test for 24VAC Between Black Common and Brown ThenTest for 24VAC Between Black and Orange Test for 24VAC Between Black and YellowTroubleshooting the Effikal Damper Test Between Black Common and Brown on the Damper BoardA1 is CORRECT, Check Service Switch Position Adjust END Switch to CAM Contact Wire Harness Test IID Module Test Pilot Spark Test Pilot Valve OHM Test SBD 120 400 GAS ValvePilot Valve Test SBD 500 only Pilot GAS Manifold Pressure TAP Blue White REDMain Burner Test Flame Rectification Flame RectificationPilot is lit Sparking has stopped Main GAS Valve Check Main GAS Valve Coil Check Main GAS Valve Coil Check SBD 500 onlyGeneral Service Chart General Questions and Answers SBD Models 120 Thru 500A Series 110/111SBD Models 120 Thru 500A Series SBD Models 120 Thru 500A Series SBD Models 120 Thru 500A Series SBD Models 120 Thru 500A Series SBD Models 120 Thru 500A Series SBD Models 120 Thru 500A SBD Models 120 Thru 500A Series Name Specifications Component Part InformationSBD Service Checklist Natural PropaneWater Piping Comments Author Terry MulderCommercial

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