A.O. Smith HYB-90N Vent Pipe Termination, Planning The Vent System, If using 2 inch vent pipe

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VENT PIPE TERMINATION

VENT PIPE TERMINATION

NOT RECOMMENDED:

PREFERRED PRACTICE:

STREET ELBOW

NORMAL ELBOW

6 in.

(15 cm) min.

BACK TO BACK ELBOWS

90° SHORT SWEEP ELBOW

90° LONG SWEEP ELBOW

(MORE RESTRICTIVE)

(LESS RESTRICTIVE)

FIGURE 19

VENT LENGTH LESS THAN OR

VENT LENGTH GREATER THAN 20

EQUAL TO 20 EQUIVALENT FEET

EQUIVALENT FEET (6.1m) USE THIS

(6.1m) USE THIS SCREEN.

SCREEN.

FIGURE 20

The first step is to determine where the vent pipe will terminate (see Figures 24, 29 & 31). The vent may terminate through a sidewall as shown in Figure 24 or through the roof as shown in Figure 29.

The vent system must terminate so that proper clearances are maintained as cited in local codes or the current edition of the National Fuel Gas Code, (ANSI Z223.1, 12.9.1 through 12.9.4).

Instructions on proper installation through a sidewall are provided in Figures 31.

Plan the vent system layout so that proper clearances are maintained from plumbing and wiring.

Vent pipes serving power vented appliances are classified by building codes as “vent connectors”. Required clearances from combustible materials must be provided in accordance with information in this manual under FACTS TO CONSIDER ABOUT LOCATION AND INSTALLING THE WATER HEATER, and with the National Fuel Gas Code and local codes.

PLANNING THE VENT SYSTEM

Plan the route of the vent system from the exhaust elbow to the planned location of the vent terminal.

1.Layout total vent system to use a minimum of vent pipe and elbows.

2.This water heater is capable of venting flue gases a maximum distance equivalent to 50 ft. (15.2m) of 2 in. pipe or 100 ft. (30.5m) of 3 in. pipe. The use of elbows reduces the maximum distance (see Table 1).

NOTE: The lengths of pipe listed are exclusive of the termination. The termination elbow, with an installed screen, is required and uses the equivalent of 7 ft. (2.1m) of vent pipe length. Therefore, the remainder of the vent system must not exceed the lengths listed.

NOTE: Do NOT use Cellcore venting (PVC outer layer, foamcore-type material for middle layer, and then PVC inside layer).

 

Maximum vent

Maximum vent

Number

length for 2 in. pipe

length for 3 in. pipe

ft. (m)

ft. (m)

of 90°

Short

Long

Short

Long

Elbows

Radius

Radius

Radius

Radius

 

 

Elbow

Elbow

Elbow

Elbow

1

43 (13.1)

45 (13.7)

93 (28.4)

95 (28.9)

2

36 (10.9)

40 (12.2)

86 (26.2)

90 (27.4)

3

29 (8.8)

35 (10.6)

79 (24.0)

85 (25.9)

4

22 (6.7)

30 (9.1)

72 (21.9)

80 (24.4)

5

15 (4.5)

25 (7.6)

65 (19.8)

75 (22.8)

TABLE 1

3.The exhaust elbow assembly comes with a straight section of 2 in. pipe installed. To continue the vent system, a rubber coupling must be attached. The venting must extend 6 in. (15cm) vertically from the top of the heater before installing an elbow.

If using 2 inch vent pipe:

Install the rubber coupling 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 vent system must not exceed the lengths discussed above, where each (short radius) elbow is equal to 7 equivalent feet (2.1m) of straight pipe. The elbow and rodent screen supplied in the vent kit must be used as the vent termination.

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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 ScrewsAPPLIANCES IN CONFINED SPACES COMBUSTION AIR AND VENTILATIONAPPLIANCES IN UNCONFINED 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/FREEZINGPLANNING THE VENT SYSTEM If using 2 inch vent pipeVENT PIPE TERMINATION 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 CONDENSATEVent terminals supplied with heater must be used SEQUENCE OF INSTALLATIONSINSTALLATION SEQUENCE INSTALLATION OF VERTICAL VENT SYSTEM INSTALLATION OF VENT SYSTEM, SIDEWALLVENT PIPE PREPARATION STEP B RECOMMENDED BRUSH* SIZE FOR PRIMER AND CEMENT APPLICATIONSSTEP A 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 INSTRUCTIONSDESCRIPTION HEAT CYCLE DEFINITIONSSTATE 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 SERVICEA Baffle, Flue B Hot Water Outlet Nipple w/ Anode, Heat Trap PARTS IDENTIFICATIONITEM # 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