Manuals / State Industries / Household Appliance / Electric Heater

State Industries SBD71 120 High Limit, Left Terminal Test, Ground 24VAC FM Transformer, Step

Models: SBD85 500 SBD71 120

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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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State Industries SBD71 120, SBD85 500 manual High Limit, Left Terminal Test, Ground 24VAC FM Transformer, Step, Then

Contents

SERVICE HANDBOOK Part Number STC-072Also includes Parts List SandBlasterSBD HANDBOOK SBD TANK TYPE HEATERS SERVICE HANDBOOKSBD TANK TYPE HEATERS SERVICE HANDBOOK Model Breakdown SBD 85 500 P E A CGA DCLEARANCES FROM COMBUSTIBLES INSTALLATIONClearance to Combustibles Table MODELSBD TANK TYPE HEATERS SERVICE HANDBOOK EXTERIOR CLEARANCE10 CUBIC FEET OF AIR PER 1,000 BTU AIR FOR COMBUSTIONMinimum SBD TANK TYPE HEATERS SERVICE HANDBOOKMAKE-UPAIR DIRECT COMMUNICATION 1 Square Inch Per 4,000 BTUHSBD TANK TYPE HEATERS SERVICE HANDBOOK HORIZONTAL DUCTS VERTICAL DUCTSSBD TANK TYPE HEATERS SERVICE HANDBOOK MAKE-UPAIRINSUFFICIENT MAKE-UPAIR BACKDRAFTSBD TANK TYPE HEATERS SERVICE HANDBOOK CONTAMINATED AIR AIR FOR COMBUSTION Flammable ItemsSBD TANK TYPE HEATERS SERVICE HANDBOOK Manifold Gas Port Supply Gas Manifold Pressure Tap Dirt LegGAS PRESSURE REQUIREMENTS Natural GasSBD GAS VALVE SBD TANK TYPE HEATERS SERVICE HANDBOOKSee step 18 for SBD-500gas valve illustration Combined Vents VENTING Atmospheric, Single, and Multiple HeatersNine Rules for Good Vents SBD TANK TYPE HEATERS SERVICE HANDBOOKSBD TANK TYPE HEATERS SERVICE HANDBOOK Nine Rules for Good Vents continuedNine Rules for Good Vents continued SBD TANK TYPE HEATERS SERVICE HANDBOOKSBD TANK TYPE HEATERS SERVICE HANDBOOK POWER VENT KITS FOR SIDEWALL VENTING1.Thermostat calls for heat SBD SEQUENCE OF OPERATION7.Thermostat satisfies 3.Intermittent Ignition ControlSBD TANK TYPE HEATERS SERVICE HANDBOOK SBD ELECTRICAL SEQUENCE 100 - 109 SeriesSBD ELECTRICAL SEQUENCE OF OPERATION 115/60/12ASBD TANK TYPE HEATERS SERVICE HANDBOOK STEP TROUBLESHOOTING SBD WATER HEATERSTEST THE TRANSFORMER THENGround 24VAC FM Transformer HIGH LIMIT, LEFT TERMINAL TESTSBD TANK TYPE HEATERS SERVICE HANDBOOK STEPReset Button TemperatureJumper Wire After Push in Reset - 24 VAC is now presentDamper Open Damper ClosedINSPECT THE DAMPER CHECK THE PC BOARDPC BOARD MOTOR TEST Service SwitchMotor Lead SBD TANK TYPE HEATERS SERVICE HANDBOOKSBD TANK TYPE HEATERS SERVICE HANDBOOK THERMOSTAT TESTSTEP THENSwitch ServiceEFFIKAL DAMPER AdapterNORMAL OPERATION HARNESS CHARTTEST FOR 24VAC BETWEEN BLACK COMMON AND BROWN Heater HarnessSTEP 8A NORMAL OPERATION continuedTEST FOR 24VAC BETWEEN BLACK AND ORANGE STEP 8BSTEP 9A TROUBLESHOOTING THE EFFIKAL DAMPERSBD TANK TYPE HEATERS SERVICE HANDBOOK ConditionA1 IS CORRECT, CHECK SERVICE SWITCH POSITION TROUBLESHOOTING THE EFFIKAL DAMPER continuedService Switch STEP 9BSTEP 10A ADJUST END SWITCH TO CAM CONTACTSTEP 10B TROUBLESHOOTING THE EFFIKAL DAMPER continuedSBD TANK TYPE HEATERS SERVICE HANDBOOK WIRE HARNESS TESTSTEP THENSBD TANK TYPE HEATERS SERVICE HANDBOOK IID MODULE TESTSTEP THENPILOT SPARK TEST Power To Module May Be Interrupted To ResetSBD TANK TYPE HEATERS SERVICE HANDBOOK STEPPILOT VALVE - OHM TEST STEP 14ASBD TANK TYPE HEATERS SERVICE HANDBOOK THENPILOT VALVE TEST - SBD 500 ONLY STEP 14BSBD TANK TYPE HEATERS SERVICE HANDBOOK THENSBD TANK TYPE HEATERS SERVICE HANDBOOK MAIN BURNER TESTSTEP THENSTEP 16. FLAME RECTIFICATION FLAME RECTIFICATIONSBD TANK TYPE HEATERS SERVICE HANDBOOK STEPSBD TANK TYPE HEATERS SERVICE HANDBOOK Pilot is lit - Sparking has stoppedSTEP IID MODULE TESTMAIN GAS VALVE CHECK STEP 18ASBD TANK TYPE HEATERS SERVICE HANDBOOK TH TRMAIN GAS VALVE COIL CHECK STEP 18BSBD TANK TYPE HEATERS SERVICE HANDBOOK THENGENERAL SERVICE CHART SERVICE HANDBOOKSBD TANK TYPE HEATERS GENERAL QUESTIONS AND ANSWERS SERVICE HANDBOOKSBD TANK TYPE HEATERS SERIES 110/111 SBD MODELS 120 THRU 500ASERVICE HANDBOOK EFFIKAL DAMPER DRIVE ASSEMBLY GAS VALVESSBD MODELS 120 THRU 500A continued SERIES SERVICE HANDBOOKSBD TANK TYPE HEATERS SERVICE HANDBOOK SeriesCLEANOUT ASSEMBLY SBD MODELS 120 THRU 500A continued SERIESCLEANOUT ASSEMBLY SERVICE HANDBOOKSBD MODELS 120 THRU 500A continued SERIES SBD TANK TYPE HEATERSCLEANOUT ASSEMBLY SERVICE HANDBOOKSBD MODELS 120 THRU 500A continued SERIES SBD TANK TYPE HEATERSCLEANOUT ASSEMBLY SERVICE HANDBOOKSBD MODELS 120 THRU 500A continued SERIES SBD TANK TYPE HEATERSCLEANOUT ASSEMBLY SERVICE HANDBOOKSBD MODELS 120 THRU 500A continued SERIES SBD TANK TYPE HEATERSCLEANOUT ASSEMBLY SERVICE HANDBOOKSBD MODELS 120 THRU 500A continued SERIES SBD TANK TYPE HEATERSSPECIFICATIONS COMPONENT PART INFORMATIONNAME STATE PARTSBD SERVICE CHECKLIST SERVICE HANDBOOK SBD TANK TYPE HEATERSV.WATER PIPING SERVICE HANDBOOK COMMENTSAuthor Terry Mulder SBD TANK TYPE HEATERSCOMMERCIAL State Water HeatersThe Expert’s Choice Copyright 2006 State Industries, Inc