State Industries SBD85 500, SBD71 120 manual PC Board Motor Test, Service Switch Motor Lead

Page 24

SBD TANK TYPE HEATERS

SERVICE HANDBOOK

STEP 6

PC BOARD MOTOR TEST

Service Switch

Motor Lead		Motor Lead

STEP 6. PC BOARD/MOTOR TEST. Check for 24 VAC between the two motor lead terminals of the PC board. Disconnect the wires for this test.

IF	THEN
24 VAC is not present:	•	Replace the Damper Drive (part #
		194484) and go to step 7. The board
		and relay are one piece. Regardless of
		which part is defective, both parts
		should be changed.
Voltage is present:	•	This verifies that the motor is receiving
		power but not closing the damper.
	•	Replace the Damper Drive and go to
		step 7.

Note: The service switch may be used to bypass the damper, while waiting for a replacement part.

WARNING - In the event of damper motor failure, verify that the damper is in the "open" position before utilizing the service switch

Technical Training Department	23
Ashland City, TN ©2003

Image 24

Contents SandBlaster SBD Tank Type Heaters Service Handbook SBD HandbookModel Breakdown SBD 85 500 P E a CGA D Installation Clearances from CombustiblesClearance to Combustibles Table ModelExterior Clearance AIR for Combustion Cubic Feet of AIR PER 1,000 BTU MinimumMAKE-UP AIR Direct CommunicationSquare Inch Per 4,000 Btuh Vertical Ducts Horizontal DuctsInsufficient MAKE-UP AIR BackdraftContaminated AIR AIR for CombustionGAS Pressure Requirements Natural Gas Propane GasSBD 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 115/60/12ATroubleshooting SBD Water Heaters Test the TransformerThen High LIMIT, Left Terminal Test Ground 24 VAC FM TransformerAfter Push in Reset 24 VAC is now present Reasons For Resetting Condition Cause SolutionTest High Limit Right Terminal Inspect the Damper Check the PC BoardService Switch Motor Lead PC Board Motor TestThermostat Test Adapter Service Motor Plug Switch Lead Heater Harness Effikal DamperHarness Chart Normal OperationTest for 24VAC Between Black Common and Brown Heater Harness Function Damper HarnessTest 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 Service SwitchAdjust END Switch to CAM Contact Wire Harness Test IID Module Test Power To Module May Be Interrupted To Reset Pilot Spark TestPilot 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 Series Parts Description Pilot Burner, LP 193314-3 CGA Manifold 76244 76244-2 195121-1 98185-2 Name Specifications State Part Numbers Component Part InformationSBD Service Checklist Water Piping Comments Author Terry MulderCommercial

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