State Industries SBD71 120 manual High LIMIT, Left Terminal Test, Ground 24 VAC FM Transformer

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SBD TANK TYPE HEATERS

SERVICE HANDBOOK

STEP 2

HIGH LIMIT, LEFT TERMINAL TEST

Ground

24VAC

FM Transformer

STEP 2. HIGH LIMIT, LEFT TERMINAL TEST. Test for 24 VAC between the left high limit terminal and ground.

IF	THEN
The meter does not read 24 VAC:	•	Check wiring between transformer and
		high limit.
The meter reads 24 VAC:	•	Go to Step 3.

Note: The high limit (Energy Cut Off) opens if the tank water temperature exceeds 205 degrees. The control is resettable (manually) when the tank water temperature drops below 185 degrees.

Technical Training Department	20
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 BTUMAKE-UP AIR Direct CommunicationSquare Inch Per 4,000 Btuh 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 VentingNine Rules for Good Vents Nine Rules for Good Vents Power Vent Kits for Sidewall Venting Sequence of Operation SBD Sequence of Operation SBD Electrical Sequence 115/60/12A SBD Electrical Sequence of OperationTroubleshooting SBD Water Heaters Test the TransformerThen Ground 24 VAC FM Transformer High LIMIT, Left Terminal TestAfter Push in Reset 24 VAC is now present Reasons For Resetting Condition Cause SolutionTest High Limit Right Terminal 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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