AIR Pressure Switches | State Industries SHE50-100NE, SHE50-100PE

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

Image 19

State Industries SHE50-100NE, SHE50-100PE, GP650HTPDT manual AIR Pressure Switches, Normal State Activated State

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 Systems Contaminated AIR AIR Requirements Maximum Equivalent Length Requirements Venting Number Maximum Pipe Elbows Length Feet Meters Service Notes VentingPipe Size Requirements Maximum Elbow Requirements Electrical Requirements Service Notes ElectricalVAC 1Ø Power Supply Correctly Wired Outlet Internal View HOW IT Works Blower Service Notes Blower Burner Service Notes Burner Flame Sensor On Next Burner & Blower Removal Burner/Blower Removal Service Notes Blower Flange & Blower Adapter Gaskets Blower Venturi Gas Valve Removal GAS ValveGasket Orifice Service Notes Checking Gas Pressures GAS Pressure Testing GAS Pressures Service Notes Gas Pressure AdjustmentGas Pressures Normal State Activated State AIR Pressure Switches Blocked Intake Switch Blower Prover SwitchBlocked Exhaust Switch Blower Prover Failure AIR Pressure Switch Operation Normal 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 Igniters Introduction Control System Features UIM Service Notes Button Pad Ribbon Cable Discreet Menu Contact Information Commercial & Residential Product Differences Desktop Screen Service Note Sequence of Operation Display Status Icon Description Status Icons State Description Operational States Modes Action Display Operating SET Point Adjustment Control System Menus ECO CCB Service Notes CCB Replacement Socket Identification J10 J13 J15 J11 J16 PIN # Description J3 Socket 120 VAC Power SupplyJ1 Socket Transformer J2 Socket 120 VAC To Blower Ext Use Yes Input Type Tstat Open Retry Service Notes Polarity & Ground Wiring Diagram YES Sequence of Operation Heater Status Menu Resetting the control systemImportant Service Reminder Rough Starting Rough Operation Note Displayed Message CHECK/REPAIR CONDITION/INDICATES Control System UnresponsiveUIM Display Is Blank UIM is Inoperable AC Reversed Fault Messages Upper Probe Short Flame Probe Short Energy Cut Out ECO Flame Detect Error Blocked 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 Failure Check for 24 VAC to the Gas Valve solenoid coil Communication Failure Gas Valve Failure Tennessee Waltz Parkway Ashland City, TN