A.O. Smith HYB-90N warranty Screws, Top Casing Front

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Screws

Screws

Screws

Top

Casing (Front)

FIGURE 7

Screws

FIGURE 9

After the heater has been positioned and the earthquake straps have been installed, re-assemble the shroud in the reverse order.

FIGURE 8

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Image 15

Contents HYBRID GAS WATER HEATERS For Your SafetyPOWER VENT GAS MODELS Installation and Operating ManualIMPORTANT INFORMATION TABLE OF CONTENTSIMPORTANT DEFINITIONS SAFE INSTALLATION, USE AND SERVICEGENERAL SAFETY DANGER INTRODUCTION Page GET TO KNOW YOUR WATER HEATER - GAS MODELS REPLACEMENT PARTS AND DELIMING PRODUCTSROUGH IN DIMENSIONS INSTALLATION CONSIDERATIONSINSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS Water Potable Heating All models are considered WATER PIPING - MIXING VALVE USAGEFACTS TO CONSIDER ABOUT LOCATION HANDLE INSTALLATION Access To EARTHQUAKE ZONESTop Casing Front ScrewsCOMBUSTION AIR AND VENTILATION APPLIANCES IN UNCONFINED SPACESAPPLIANCES IN CONFINED SPACES B. ALL AIR FROM OUTDOORS See Figures 12, 13 and THERMAL EXPANSION CHEMICAL VAPOR CORROSIONWATER PIPING CLOSED WATER SYSTEMSTEMPERATURE-PRESSURE RELIEF VALVE HARD WATERT&P Valve and Pipe Insulation if supplied SEDIMENT TRAPS GAS PIPINGFILLING THE WATER HEATER HIGH ALTITUDE INSTALLATIONSGAS LINE PURGING FLOODING/FREEZINGIf using 2 inch vent pipe VENT PIPE TERMINATIONPLANNING THE VENT SYSTEM ELBOW STRAP If using 3 inch vent pipeRODENT SCREEN INSTALL INTO ELBOW GROUND LEVEL OR MAXIMUM SNOW LINE TERMINATION ELBOWCONDENSATION WARNING INSTALLATION OF VENT SYSTEMVENT TERMINAL INSTALLATION, SIDEWALL CONDENSATESEQUENCE OF INSTALLATIONS INSTALLATION SEQUENCEVent terminals supplied with heater must be used INSTALLATION OF VERTICAL VENT SYSTEM INSTALLATION OF VENT SYSTEM, SIDEWALLVENT PIPE PREPARATION RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONS STEP ASTEP B STEP G CONNECTION TO VENT PIPE U.S. POWER VENTSTEP E STEP FVENT HOODS MAY BE EXTREMELY HOT DURING OPERATION “OFF”, “up” ELECTRICAL CONNECTIONSCALIBRATION FIGURE 33aDISPLAY PANEL OPERATING INSTRUCTIONSNumeric Display CAUSE IMPROPER AND DANGEROUS CAUTION LABEL ALL WIRES PRIOR TODISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CANTO TURN OFF GAS TO APPLIANCE LIGHTING INSTRUCTIONSFOR YOUR SAFETY READ BEFORE LIGHTING OPERATING INSTRUCTIONSHEAT CYCLE DEFINITIONS STATEDESCRIPTION TEMPERATURE REGULATION Temperature Probes UNIQUE HYBRID FEATURESWater Circulation Pump Line Voltage Monitor OPERATIONAL CONDITIONS CONSTANT OUTPUT TEMPERATURE CONTROLDetection of Failure to Maintain Desired Constant Temperature START UP CONDITIONSBURNER OPERATION AND INSPECTION MAINTENANCEHOUSEKEEPING VENTING SYSTEM INSPECTIONMOTORS ANODE ROD REPLACEMENTCLEANING THE INLET WATER FILTER TEMPERATURE-PRESSURE RELIEF VALVE OPERATIONFLUSHING THE HEAT EXCHANGER LIME BUILD- UP CLEANING THE HEAT ENGINEDRAINING THE TANK FAULT INDICATION AND ERROR CODESDisplayed DIAGNOSTIC DISPLAYDiagnostic Code andRemedy FaultLockout CauseDescription FaultLockout CodeDescription TROUBLESHOOTING system installed, or there is a WHEN THE TAP IS OPENEDCheck if there is any error code on b.The unit display is an error codeLEAKAGE CHECKPOINTS SERVICEPARTS IDENTIFICATION ITEM #A Bafﬂe, Flue B Hot Water Outlet Nipple w/ Anode, Heat Trap AB C DEF G T SH R I Q P KIT # REPLACEMENT PARTS DESCRIPTIONCONDITIONS AND EXCEPTIONS LIMITED RESIDENTIAL GAS WARRANTYSERVICE AND LABOR RESPONSIBILITY CLAIM PROCEDUREPage Page 500 TENNESSEE WALTZ PARKWAY ASHLAND CITY, TN PHONE 1-800-433-2545 FAX