A.O. Smith HYB-90N If using 3 inch vent pipe, Termination Elbow, Elbow Strap, ELBOW 6 in 15cm MIN

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TERMINATION ELBOW

TERMINATION ELBOW

NOTE: VENT PIPE MUST BE SUPPORTED EVERY 4 ft. (1.2m). TO PREVENT VIBRATION, USE ISOLATION PADS WHEN ATTACHING STRAPS TO FLOOR JOISTS, WALLS OR CEILINGS.

45°

 ELBOW ELBOW

RODENT SCREEN (INSTALL INTO ELBOW) STRAP If using 3 inch vent pipe:

90°

RODENT SCREEN (INSTALL INTO ELBOW)

GROUND LEVEL OR

MAXIMUM SNOW

LINE*

Example for calculating equivalent feet. Section “A” . . . . 0.5 ft. . . (0.15m)

90° elbow . . . . . 7.0 ft. . . (2.13m) Section B . . . . . 1.0 ft. . . (0.31m) 45° elbow . . . . . 4.0 ft. . . (1.21m) Section C . . . . . 1.5 ft. . . (0.46m) 45° elbow . . . . . 4.0 ft. . . (1.21m) Section D . . . . . 15.0 ft. . (4.57m) Total Equivalent 33.0 ft. . (10.04m)

Based on this example use the (fully open) rodent screen for vent length greater than 20 equivalent ft. (6.1 equivalent metres).

Vent piping must slope up from heater to termination a minimum of 1/8 in. (0.3cm) rise per 4 ft. (1.2m) of vent piping

Manual background ELBOW

6in.

(15cm)

MIN.

FIGURE 21

If using 3 inch vent pipe:

Install the rubber reducing coupling (2 in. to 3 in.) and gear clamps (supplied) at the end of the section of vent pipe installed on the heater. Continue building the vent system, or connect the existing vent system to the coupling. The total system must not exceed the equivalent pipe lengths discussed above where each (long radius) elbow is equal to 5 ft. (1.5m) of 3 in. diameter straight vent pipe. The elbow and rodent screen supplied in the vent kit must be used as the vent termination.

NOTE: This unit can be vented with PVC pipe materials (DWV ASTM-D2665; Schedule 40, 80, 120 ASTM- D1785; or SDR Series ASTM-D2241), CPVC pipe materials (CPVC41 ASTM-D2846; Schedule 40, 80 ASTM-F441; or SDR Series ASTM-F442), ABS pipe materials (Schedule 40 DWV ASTM-D2661). The fittings, other than the TERMINATION should be equivalent to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC fittings, ASTM F-438 for CPVC pipe and ABS fittings, ASTM D-2661/3311 for ABS pipe). If CPVC or ABS pipe and fittings are used, then proper cement must be used for all joints, including joining the pipe to Termination (PVC Material). If local codes do not allow the use of the PVC termination when a material other than PVC is used for venting, then an equivalent fitting of that material may be substituted if the screen in the PVC terminal is removed and inserted into the new fitting.

This water heater is supplied with a 45 degree termination elbow that is a special fitting that must be used with the appliance.

PVC Materials should use ASTM D-2564 Grade Cement; CPVC Materials should use ASTM F-493 Grade Cement and ABS Materials should use ASTM D-2235 Grade Cement.

If the water heater is being installed as a replacement for an existing power vented heater in pre-existing venting, a thorough inspection of existing venting system must be performed prior to any installation work. Verify that correct material as detailed above has been used, and that the minimum or maximum vent lengths and terminal location as detailed in this manual have been met. Carefully inspect the entire venting system for any signs of cracks or fractures, particularly at joints between elbows and other fittings and straight runs of vent pipe. Check system for signs of sagging or other stresses in joints as a result of misalignment of any components in the system. If any of these conditions are found, they must be corrected in accordance with the venting instructions in this manual before completing installation and putting the water heater into service.

NOTE: (A.) For water heaters in locations with high ambient temperatures (above 100°F (38°C)) it is recommended that CPVC or ABS pipe and fittings be used. (B.) A 22.5 degree elbow (2 in. vent pipe) or a 45 degree elbow (3 in. vent pipe) with an installed screen VENT TERMINAL must be used in all cases.

4.There will be some installations where condensate will be formed in the horizontal runs of the vent system. This condensate will run into the condensate trap. The water heater is shipped with a condensate tube that attaches to the condensate trap. No other tee or fitting is required.

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Contents For Your Safety POWER VENT GAS MODELSInstallation and Operating Manual HYBRID GAS WATER HEATERSTABLE OF CONTENTS IMPORTANT INFORMATIONSAFE INSTALLATION, USE AND SERVICE IMPORTANT DEFINITIONSGENERAL SAFETY DANGER INTRODUCTION Page REPLACEMENT PARTS AND DELIMING PRODUCTS GET TO KNOW YOUR WATER HEATER - GAS MODELSINSTALLATION CONSIDERATIONS ROUGH IN DIMENSIONSINSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS WATER PIPING - MIXING VALVE USAGE Water Potable Heating All models are consideredFACTS TO CONSIDER ABOUT LOCATION HANDLE INSTALLATION EARTHQUAKE ZONES Access ToScrews Top Casing FrontCOMBUSTION AIR AND VENTILATION APPLIANCES IN UNCONFINED SPACESAPPLIANCES IN CONFINED SPACES B. ALL AIR FROM OUTDOORS See Figures 12, 13 and CHEMICAL VAPOR CORROSION WATER PIPINGCLOSED WATER SYSTEMS THERMAL EXPANSIONHARD WATER TEMPERATURE-PRESSURE RELIEF VALVET&P Valve and Pipe Insulation if supplied GAS PIPING SEDIMENT TRAPSHIGH ALTITUDE INSTALLATIONS GAS LINE PURGINGFLOODING/FREEZING FILLING THE WATER HEATERIf using 2 inch vent pipe VENT PIPE TERMINATIONPLANNING THE VENT SYSTEM If using 3 inch vent pipe RODENT SCREEN INSTALL INTO ELBOW GROUND LEVEL OR MAXIMUM SNOW LINETERMINATION ELBOW ELBOW STRAPINSTALLATION OF VENT SYSTEM VENT TERMINAL INSTALLATION, SIDEWALLCONDENSATE CONDENSATION WARNINGSEQUENCE OF INSTALLATIONS INSTALLATION SEQUENCEVent terminals supplied with heater must be used INSTALLATION OF VENT SYSTEM, SIDEWALL INSTALLATION OF VERTICAL VENT SYSTEMVENT PIPE PREPARATION RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONS STEP ASTEP B U.S. POWER VENT STEP ESTEP F STEP G CONNECTION TO VENT PIPEVENT HOODS MAY BE EXTREMELY HOT DURING OPERATION ELECTRICAL CONNECTIONS CALIBRATIONFIGURE 33a “OFF”, “up”OPERATING INSTRUCTIONS DISPLAY PANELNumeric Display CAUTION LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICINGCONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUSLIGHTING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE LIGHTINGOPERATING INSTRUCTIONS TO TURN OFF GAS TO APPLIANCEHEAT CYCLE DEFINITIONS STATEDESCRIPTION TEMPERATURE REGULATION UNIQUE HYBRID FEATURES Temperature ProbesWater Circulation Pump Line Voltage Monitor CONSTANT OUTPUT TEMPERATURE CONTROL Detection of Failure to Maintain Desired Constant TemperatureSTART UP CONDITIONS OPERATIONAL CONDITIONSMAINTENANCE HOUSEKEEPINGVENTING SYSTEM INSPECTION BURNER OPERATION AND INSPECTIONANODE ROD REPLACEMENT CLEANING THE INLET WATER FILTERTEMPERATURE-PRESSURE RELIEF VALVE OPERATION MOTORSCLEANING THE HEAT ENGINE FLUSHING THE HEAT EXCHANGER LIME BUILD- UPFAULT INDICATION AND ERROR CODES DRAINING THE TANKDIAGNOSTIC DISPLAY DiagnosticCode and DisplayedFault LockoutCause RemedyFault LockoutCode DescriptionFault TROUBLESHOOTING WHEN THE TAP IS OPENED Check if there is any error code onb.The unit display is an error code system installed, or there is aSERVICE LEAKAGE CHECKPOINTSPARTS IDENTIFICATION ITEM #A Baffle, Flue B Hot Water Outlet Nipple w/ Anode, Heat Trap AB C DEF G T SH R I Q P REPLACEMENT PARTS DESCRIPTION KIT #LIMITED RESIDENTIAL GAS WARRANTY SERVICE AND LABOR RESPONSIBILITYCLAIM PROCEDURE CONDITIONS AND EXCEPTIONSPage Page 500 TENNESSEE WALTZ PARKWAY ASHLAND CITY, TN PHONE 1-800-433-2545 FAX