State Industries SHE50-100NE, SHE50-100PE AIR Pressure Switches, Normal State Activated State

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ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL

AIR PRESSURE SWITCHES

Air pressure switch technical bulletins TB-A023-06 and TB-S023-06 explain air pressure switch construction and test procedures in detail. These technical bulletins are available on the manufacturers web site or by calling the technical support phone number shown on the water heater labeling. Construction and types of air pressure switches used on the water heater covered in this Service Manual are shown below.

Construction
Normal State	Activated State
(open switch contacts)	(closed switch contacts)
Switch Contacts Wiring Terminals
Internal Linkage
Vent Port
Flexible Diaphragm	Sensing Port
Application & Type
Normal State	Activated State

Blower Prover

Air Pressure Switch

Normally open contacts, close on a rise in pressure.

Blocked Intake

Air Pressure Switch

Normally closed contacts, open on a fall in pressure.

Blocked Exhaust

Air Pressure Switch

Normally closed contacts, open on a rise in pressure.

Technical Literature Department	18 of 52	Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent

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Contents Service Handbook Ultra High Efficiency Power VENT/POWER Direct Vent Service Warning Qualifications Qualified Service AgentImportant Service Reminder Tools Required Thermal Expansion Closed Water SystemsContaminated AIR AIR RequirementsMaximum Equivalent Length Requirements VentingNumber Maximum Pipe Elbows Length Feet Meters Service Notes VentingPipe Size Requirements Maximum Elbow RequirementsElectrical Requirements Service Notes ElectricalVAC 1Ø Power Supply Correctly Wired OutletInternal View HOW IT WorksBlower Service Notes BlowerBurner Service Notes Burner Flame SensorOn Next Burner & Blower RemovalBurner/Blower Removal Service Notes Blower Flange & Blower Adapter GasketsBlower VenturiGas Valve Removal GAS ValveGasket Orifice Service Notes Checking Gas Pressures GAS Pressure TestingGAS Pressures Service Notes Gas Pressure AdjustmentGas Pressures Normal State Activated State AIR Pressure SwitchesBlocked Intake Switch Blower Prover SwitchBlocked Exhaust Switch Blower Prover Failure AIR Pressure Switch OperationNormal State Test AIR Pressure Switch TestingOperational State Test Pressure Test Air Pressure Switch ParametersBlower Prover Blocked Intake Blocked Exhaust Page Measuring Flame Sensing Current Flame Sensing TestFlame Sensor Igniter Current Test Service Notes Hot Surface IgnitersIntroduction Control System FeaturesUIM Service Notes Button Pad Ribbon CableDiscreet Menu Contact Information Commercial & Residential Product DifferencesDesktop Screen Service Note Sequence of Operation DisplayStatus Icon Description Status IconsState Description Operational States ModesAction Display Operating SET Point AdjustmentControl System Menus ECO CCB Service Notes CCB ReplacementSocket Identification J10 J13 J15 J11 J16PIN # Description J3 Socket 120 VAC Power SupplyJ1 Socket Transformer J2 Socket 120 VAC To BlowerExt Use Yes Input Type Tstat Open RetryService Notes Polarity & Ground Wiring DiagramYES Sequence of OperationHeater Status Menu Resetting the control systemImportant Service Reminder Rough Starting Rough Operation NoteDisplayed Message CHECK/REPAIR CONDITION/INDICATES Control System UnresponsiveUIM Display Is Blank UIM is InoperableAC Reversed Fault MessagesUpper Probe Short Flame Probe ShortEnergy Cut Out ECO Flame Detect ErrorBlocked Inlet Blocked Exhaust Vent Blower Prover Open Perform ALL These Tests with PowerTurned on and a Call for Heat Active Low Igniter Current Rough Starting Rough Operation Note Ignition FailureCheck for 24 VAC to the Gas Valve solenoid coil Communication Failure Gas Valve FailureTennessee Waltz Parkway Ashland City, TN