A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Instruction Manual
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A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Instruction Manual

A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Instruction Manual

A.o. smith residential power vent gas water heaters with hot surface ignition instruction manual
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Instruction Manual for
Residential Power Vent
Gas Water Heaters
with Hot Surface Ignition
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
GAMA certification applies to all
residential gas water heaters with
capacities of 20 to 100 gallons
with input rating of 75,000
BTU/Hr. or less.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM
WHOM THE WATER HEATER WAS PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COM-
PANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
For Your Safety
WARNING: If the information in these
instructions are not followed exactly, a fire
or explosion may result, causing property
damage, personal injury or death.
–Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
–WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
–Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
Save this Manual for Future Reference.
AN ODORANT IS ADDED TO THE GAS
USED BY THIS WATER HEATER
Improper installation, adjustment, alteration,
service or maintenance can cause DEATH, SERI-
OUS BODILY INJURY, OR PROPERTY DAM-
AGE. Refer to this manual for assistance or con-
sult the local gas utility for further information.
Flammable vapors may be drawn by air cur-
rents from other areas of the structure to this
appliance.
READ THE GENERAL SAFETY SECTION BEGIN-
NING ON INSIDE COVER AND THEN THIS
ENTIRE MANUAL BEFORE INSTALLING OR
OPERATING THIS WATER HEATER.
WARNING
WARNING
WARNING
184326-001
11-03

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Summary of Contents for A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition

  • Page 1 Instruction Manual for Residential Power Vent Gas Water Heaters with Hot Surface Ignition NOT FOR USE IN MANUFACTURED (MOBILE) HOMES GAMA certification applies to all residential gas water heaters with capacities of 20 to 100 gallons with input rating of 75,000 BTU/Hr.

  • Page 2: General Safety

    General Safety WARNING Improper installation, adjustment, alteration, service or main- tenance can cause death, serious bodily injury, or property damage. Refer to this manual or consult your local gas utility for further assistance. WARNING At the time of manufacture this water heater was provided with a combination temperature-pressure relief valve certified by a nationally recognized testing laboratory that maintains period- ic inspection of production of listed equipment or materials, as...

  • Page 3: General Safety

    General Safety (cont’d) WARNING This water heater must not be installed directly on carpeting. Car- peting must be protected by a metal or wood panel beneath the appliance extending beyond the full width and depth of the ap- pliance by at least 3 inches (76.2mm) in any direction, or if the ap- pliance is installed in an alcove or closet, the entire floor must be covered by the panel.

  • Page 4: Table Of Contents

    Table of Contents General Safety ...2,3 Table of Contents Introduction ...5 Preparing for the New Installation Typical Installation Locating the New Water Heater Facts to Consider About Location ...7 Combustion Air and Ventilation ...8,9 Venting Clearances...8,9 Combustion Air and Ventilation for Appliances Located in Unconfined Spaces...9 Combustion Air and Ventilation for Appliances Located in Confined Spaces ...10 Installing the New Water Heater Water Piping ...11...

  • Page 5: Introduction

    Introduction Thank You for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service. Abbreviations Found In This Instruction Manual CSA - Canadian Standards Association ANSI - American National Standards Institute NFPA - National Fire Protection Association Preparing for the New Installation 1.

  • Page 6: Typical Installation

    Typical Installation VENT TO OUTDOORS HOT WATER OUTLET TEMPERED MIXING VALVE WATER OUTLET 7' power cord (Factory supplied) *Certain models do not have these connection assemblies shipped with the water heater. They (Part #9001262) are available through the manufacturer. See “Repair Parts” section for ordering information. This appliance has been design certified as complying with American National Standard/CSA Standard for water heaters and is considered suitable for: Water (Potable) Heating: All models are “considered suitable for water (potable) heating.”...

  • Page 7: Locating The New Water Heater

    Locating the New Water Heater Facts to Consider About the Location You should carefully choose an indoor location for the new water heater, because the placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the appliance.

  • Page 8: Combustion Air And Ventilation

    Locating the New Water Heater (cont’d) Facts to Consider About the Location (cont’d) WARNING Propellants of aerosol sprays and volatile compounds, (cleaners, chlorine based chemicals, refrigerants, etc.) in addition to being highly flammable in many cases, will also change to corrosive hydrochloric acid when exposed to the combustion products of the water heater.

  • Page 9: Combustion Air And Ventilation For Appliances Located In Unconfined Spaces

    Locating the New Water Heater (cont’d) 9″ min. from any overhang C Lof Flue 12″ min. Figure 2 48″ min. 48″ min. POWER VENT TERMINAL 12″ min. Figure 3a VENT TERMINAL 18″ MIN. 18″ MIN. Figure 3b POWER VENT TERMINAL 18″...

  • Page 10: Combustion Air And Ventilation For Appliances Located In Confined Spaces

    Locating the New Water Heater (cont’d) Combustion Air and Ventilation for Appliances Located in Confined Spaces Confined Space is a space whose volume is less than 50 cubic feet per 1,000 Btu per hour of the aggregate input rating of all appliances installed in that space.

  • Page 11: Installing The New Water Heater

    Installing the New Water Heater Water Piping WARNING HOTTER WATER CAN SCALD: Water heaters are intend- ed to produce hot water. Water heated to a temperature which will satisfy clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon contact.

  • Page 12: Temperature-Pressure Relief Valve

    Installing the New Water Heater (cont’d) Temperature-Pressure Relief Valve WARNING At the time of manufacture this water heater was provided with a combination temperature-pressure relief valve certi- fied by a nationally recognized testing laboratory that main- tains periodic inspection of production of listed equipment or materials, as meeting the requirements for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, and the current edition of ANSI Z21.22 •...

  • Page 13: Filling The Water Heater

    Installing the New Water Heater (cont’d) Filling the Water Heater CAUTION Never use this water heater unless it is completely filled with water. To prevent damage to the tank, the tank must be filled with water. Water must flow from the hot water faucet before turning “ON”...

  • Page 14: Wiring Diagram

    Installing the New Water Heater (cont’d) Wiring (cont’d) OPTIONAL Field Installed Wiring (cont’d) 5. The water heater must be electrically “grounded” by the installer. A green ground screw has been provided on the water heaters junction box. Connect ground wire to this location.

  • Page 15: Venting

    Installing the New Water Heater (cont’d) Venting WARNING To insure proper venting of this gas-fired water heater, the correct vent pipe diameter must be utilized. Do not install any other gas appliances on the same vent with this water heater as this will adversely affect the operation of the water heater.
  • Page 16 Installing the New Water Heater (cont’d) Venting (cont’d) VENTING THROUGH AN OUTSIDE WALL (cont’d) 75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON 52,500, 55,000 and 62,500 BTU/HR, 40 GALLON 50,000 BTU/HR MODELS ONLY 4. The water heater requires its own (separate) venting system.
  • Page 17 Installing the New Water Heater (cont’d) 3. A 3″ PVC, ABS or CPVC Schedule 40 pipe, minimum length of 3″ (must be supplied locally), to make vent connection at the blower outlet. 4. A 3″ to 2″ PVC, ABS or CPVC Schedule 40 reducer (must be supplied locally).
  • Page 18 Installing the New Water Heater (cont’d) Venting (cont’d) VENTING THROUGH AN OUTSIDE WALL (cont’d) 40 AND 50 GALLON 40,000 BTU/HR MODELS (3″ VENT) SEE CHART BELOW FOR MAX. LENGTH 4′ MIN. ″ MIN. MIN. RISE ⁄ 14″ MIN. PER FIVE FEET 2.
  • Page 19 Installing the New Water Heater (cont’d) 2. Refer to the tables below for maximum vent lengths for low ground clearance installations. All installations assume the use of two additional 90° elbows and the standard 45° vent cap with screen outside of the exteri- or wall.
  • Page 20 Installing the New Water Heater (cont’d) Venting (cont’d) CUTTING OPENING THROUGH AN OUTSIDE WALL AND COLLAR INSTALLATION After reading the manual and you have determined the location of the opening in the wall, (using the drawing ″ hole for 2″ vent piping, 3 below), cut a 2 ⁄...
  • Page 21 Installing the New Water Heater (cont’d) 4. If the optional 4″ vent piping is to be used (50,000 BTU/Hr. and higher models only), the 4″ street elbow, 4″ to 3″ reducer and 3″ (minimum) section of 3″ PVC, ABS or CPVC pipe must be supplied locally. The 3″ (mini- mum) section of 3″...

  • Page 22: Gas Piping

    Installing the New Water Heater (cont’d) VENTING THROUGH A ROOF (cont’d) 90˚ STREET 45˚ VENT CAP SEAL AROUND FLASHING SCREEN VENT CAP MUST BE POSITIONED 18″ MIN. DOWNWARD EACH VENT MAINTAIN LISTED CLEARANCE SUPPORT IF NECESSARY POSITION FIRESTOP MAINTAIN LISTED CLEARANCE CERTIFIED WATER HEATER...
  • Page 23 Installing the New Water Heater (cont’d) A gas line of sufficient size must be run to the water heater. Consult the current edition of National Fuel Gas Code ANSI Z223.1, also referred to as NFPA 54 and the gas company concerning pipe size. There must be: —...

  • Page 24: Installation Checklist

    Installing the New Water Heater (cont’d) Installation Checklist BEFORE OPERATING THE HEATER: 1. Check the gas line for leaks. a. Use a soapy water solution. DO NOT test for gas leaks using a match or open flame. b. Brush the soapy water solution on all gas pipes, joints and fittings.

  • Page 25: Operating

    Operating This water heater is equipped with an electrically operated venting system and electronic control. For the burner to come on, the water heater thermostat must call for heat. Then the system will begin sequencing, each section prov- ing itself before gas is allowed to flow to the burner. BEFORE THE WATER HEATER WILL OPERATE: 1.
  • Page 26 Operating (cont’d) WARNING BEFORE OPERATING [PROPANE (L.P.) GAS WATER HEATERS]: Propane (L.P.) gas is heavier than air. Should there be a leak in the system, the gas will settle near the ground. Basements, crawl spaces, skirted areas under manufactured (mobile) homes (even when ventilated), closets and areas below ground level will serve as pock- ets for the accumulation of this gas.
  • Page 27 Operating (cont’d) FOR YOUR SAFETY READ BEFORE OPERATING WARNING: explosion may result causing property damage, personal injury or loss of life. BEFORE OPERATING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner.

  • Page 28: Temperature Regulation

    Temperature Regulation Due to the nature of the typical gas water heater, the water temperature in certain situations may vary up to 30°F high- er or lower at the point of use such as, bathtubs, showers, sink, etc. Any water heaters intended purpose is to heat water. Hot water is needed for cleaning, (bodies, dishes, clothing).

  • Page 29: For Your Information

    For Your Information Start Up Conditions CONDENSATION Whenever the water heater is filled with cold water, a cer- tain amount of condensation will form while the burner is on. A water heater may appear to be leaking when in fact the water is condensing.

  • Page 30: Air" In Hot Water Faucet's

    For Your Information (cont’d) SMELLY WATER (cont’d) If the smelly water persists after the anode replacement and chlorination treatment, we can only suggest that continuous chlorination and filtering conditioning equipment be con- sidered to eliminate the water problem. Do not remove the anode leaving the tank unprotected. By doing so, all warranty on the water heater tank is voided.

  • Page 31: Periodic Maintenance

    Periodic Maintenance Venting System Inspection At least once a year a visual inspection should be made of the venting system. You should look for: 1. Obstructions which could cause improper venting. The combustion and ventilation air flow must not be obstructed.

  • Page 32: Gas Control Valve & Burner Assembly Replacement Information

    Periodic Maintenance (cont’d) L.P. Gas Control Valve & Burner Assembly Replacement Information WARNING PROPANE (L.P.) GAS CONTROL VALVE AND BURNER ASSEMBLY REPLACEMENT INFORMATION. For Propane (L.P.) Gas Models Only: Your water heater is equipped with a Propane (L.P.) gas control valve and a main burner assembly with left hand threads for the following fittings and their connections.

  • Page 33: Draining

    Periodic Maintenance (cont’d) Draining The water heater should be drained if being shut down dur- ing freezing temperatures. Also periodic draining and clean- ing of sediment from the tank may be necessary. 1. Turn “OFF” gas supply to water heater. 2.

  • Page 34: Leakage Checkpoints

    Leakage Checkpoints Use this guide to check a “Leaking” water heater. Many sus- pected “Leakers” are not leaking tanks. Often the source of the water can be found and corrected. If you are not thoroughly familiar with gas codes your water heater, and safety practices, contact the gas utility to check the water heater.

  • Page 35: Troubleshooting

    Troubleshooting WARNING This troubleshooting guide has been supplied for use by qualified service personnel who have a complete under- standing of both electricity and gas. Turn “ON” gas supply. Call gas company to increase gas pressure. Label all wiring before disconnecting any wiring; to ensure correct reconnection.
  • Page 36 Troubleshooting (cont’d) SYSTEMS CHECK Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician. LED STATUS An open earth ground circuit to the ▼ A B C ignition system. ● ● ●...

  • Page 37: Troubleshooting

    Troubleshooting (cont’d) PROBLEM Blower will not run. A) “ON/OFF” control switch turned off. B) Blower unplugged. C) No power at outlet. D) Thermostat defective. E) Control harness defective. F) High limit control circuit open. NOT ENOUGH G) Blower motor defective. HOT WATER Thermostat problems.

  • Page 38: Repair Parts

    Repair Parts PVC, ABS or CPVC items for all models supplied locally Blower/Draft Hood Assembly for 40,000 Btu/Hr Models Only...

  • Page 39: Repair Parts

    Repair Parts (cont’d) PART DESCRIPTION Vent Cap w/Screen (PVC) Wall Collar PVC, ABS or CPVC Schedule 40 Vent Pipe (supplied locally) 90° PVC, ABS or CPVC Schedule 40 Elbow (supplied locally) Vent/Blower Adapter Blower Blower Gasket Venting Manual Reset Switch Draft Hood Assembly Dip Tube Anode Rod...

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