State Industries GP650HTPDT Blower Prover Switch, Blocked Intake Switch, Blocked Exhaust Switch

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

AIR PRESSURE SWITCHES (CONT)

The water heater covered in this Service Manual is factory equipped with three air pressure switches. These switches are used to provide verification or prove electrically that the blower is running and that the vent and intake air pipes are not blocked or restricted. The switches are located on the top of the water heater as shown in the illustration below.

BLOWER PROVER SWITCH

normally open contacts - close on a rise in pressure

BLOCKED INTAKE SWITCH

normally closed contacts - open on a fall in pressure

BLOCKED EXHAUST SWITCH

normally closed contacts - open on a rise in pressure

All switches have SPST(single pole single throw) contacts.

TOP VIEW

FRONT

These switches monitor air pressure through plastic sensing tubes from three different sensing ports on the water heater. The Blower Prover switch monitors pressure from the blower’s outlet flange. The Blocked Intake switch monitors pressure from the blower’s intake air connection fitting. The Blocked Exhaust switch monitors pressure from the exhaust/vent connection elbow on the bottom of the water heater. See the images below.

Blower Prover Switch

Blocked Intake Switch

Blocked Exhaust Switch

Blocked Exhaust Switch Sensing Port

Technical Literature Department

19 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 Important Service Reminder Qualifications Qualified Service AgentService Warning Tools Required Closed Water Systems Thermal ExpansionAIR Requirements Contaminated AIRVenting Maximum Equivalent Length RequirementsService Notes Venting Pipe Size RequirementsMaximum Elbow Requirements Number Maximum Pipe Elbows Length Feet MetersService Notes Electrical VAC 1Ø Power SupplyCorrectly Wired Outlet Electrical RequirementsHOW IT Works Internal ViewService Notes Blower BlowerService Notes Burner Flame Sensor BurnerBurner & Blower Removal On NextService Notes Blower Flange & Blower Adapter Gaskets Burner/Blower RemovalVenturi BlowerGasket Orifice GAS ValveGas Valve Removal GAS Pressure Testing Service Notes Checking Gas PressuresGas Pressures Service Notes Gas Pressure AdjustmentGAS Pressures AIR Pressure Switches Normal State Activated StateBlocked Exhaust Switch Blower Prover SwitchBlocked Intake Switch AIR Pressure Switch Operation Blower Prover FailureOperational State Test AIR Pressure Switch TestingNormal State Test Blower Prover Blocked Intake Blocked Exhaust Air Pressure Switch ParametersPressure Test Page Flame Sensor Flame Sensing TestMeasuring Flame Sensing Current Service Notes Hot Surface Igniters Igniter Current TestControl System Features IntroductionService Notes Button Pad Ribbon Cable UIMCommercial & Residential Product Differences Discreet Menu Contact InformationService Note Sequence of Operation Display Desktop ScreenStatus Icons Status Icon DescriptionOperational States Modes State DescriptionOperating SET Point Adjustment Action DisplayControl System Menus ECO Service Notes CCB Replacement CCBJ10 J13 J15 J11 J16 Socket IdentificationJ3 Socket 120 VAC Power Supply J1 Socket TransformerJ2 Socket 120 VAC To Blower PIN # DescriptionRetry Ext Use Yes Input Type Tstat OpenWiring Diagram Service Notes Polarity & GroundSequence of Operation YESResetting the control system Important Service ReminderRough Starting Rough Operation Note Heater Status MenuControl System Unresponsive UIM Display Is BlankUIM is Inoperable Displayed Message CHECK/REPAIR CONDITION/INDICATESFault Messages AC ReversedFlame Probe Short Upper Probe ShortFlame Detect Error Energy Cut Out ECOBlocked Inlet Blocked Exhaust Vent Turned on and a Call for Heat Active Perform ALL These Tests with PowerBlower Prover Open Low Igniter Current Ignition Failure Rough Starting Rough Operation NoteCheck for 24 VAC to the Gas Valve solenoid coil Gas Valve Failure Communication FailureTennessee Waltz Parkway Ashland City, TN