A.O. Smith 315795-000 MH User Manual

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Instruction Manual

RESIDENTIAL DIRECT VENT GAS WATER HEATERS

FOR USE ONLY IN MANUFACTURED HOMES

FOR USE ONLY WITH VENTING SYSTEMS SUPPLIED WITH

THE WATER HEATER WHETHER A NEW INSTALLATION OR A

REPLACEMENT INSTALLATION.

CANADIAN MANUAL

For Your Safety

AN ODORANT IS ADDED TO THE GAS USED

BY THIS WATER HEATER.

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 COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.

KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

PRINTED IN THE U.S.A 0209

1

PART NO. 315795-000

SAFE INSTALLATION, USE AND SERVICE

Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.

Many safety-relatedmessages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install, use or service this water heater.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards.

Obey all safety messages that follow this symbol to avoid possible injury or death.

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, could result in property damage.

All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and how to avoid the risk of injury.

IMPORTANT DEFINITIONS

Qualified Technician: A qualified technician must be licensed/authorized to install gas water heaters and to work with natural/L.P. gas, gas/air venting, and gas components. He or she must also have appropriate trade knowledge and a thorough understanding of the requirements of the Natural Gas and Propane Installation Code (CSAB149.1-currentedition) as it relates to the installation of gas fired water heaters. The qualified technician must also be familiar with the design features and use of flammable vapor ignition resistant water heaters, and have a thorough understanding of this instruction manual.

Service Agency: Employees/representatives of a service agency must also be licensed/authorized to install gas water heaters and to work with natural/L.P. gas, gas/air venting, and gas components. Its employees and representatives must also have appropriate trade knowledge and a thorough understanding of the requirements of the Natural Gas and Propane Installation Code (CSAB149.1-currentedition) as it relates to the installation of gas fired water heaters. The service agency employees/representatives must also have a thorough understanding of this instruction manual, and be able to perform repairs strictly in accordance with the service guidelines provided by the manufacturer.

Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also offer service and inspection of appliances within the building.

2

GENERAL SAFETY

3

TABLE OF CONTENTS

SAFE INSTALLATION, USE AND SERVICE..................................

2

GENERAL SAFETY........................................................................

3

TABLE OF CONTENTS..................................................................

4

INTRODUCTION............................................................................

4

Preparing for the New Installation .............................................

4

TYPICAL INSTALLATION............................................................

5-6

LOCATING THE NEW WATER HEATER.......................................

7

Facts to Consider About Location ..........................................

7-8

Insulation Blankets .................................................................

8-9

INSTALLING THE NEW WATER HEATER ...............................

9-19

Water Heater Installation ......................................................

9-10

Securing Water Heater to Floor and Wall................................

10

Roof Jack Installation .........................................................

11-14

Manufactured Home installed Over Basement or

 

Crawl space-AirIntake Through an Outside wall ...............

12,13

Cutting Opening Through an Outside Wall and

 

Collar Installation................................................................

13

Cementing PVC, ABS or CPVC Pipe and Fittings..............

13

Water Piping ............................................................................

14

T & P Valve and Pipe Insulation ....................................

14,15

Temperature Pressure Relief Valve....................................

15

Filling the Water Heater...........................................................

16

Gas Piping...............................................................................

16

Sediment Traps .......................................................................

17

Fuel Conversion Instructions from Natural Gas

 

to Propane (L.P.) Gas.........................................................

17,18

Fuel Conversion Instructions from Propane (L.P.)

 

to Natural Gas .........................................................................

19

LIGHTING & OPERATING LABEL ...............................................

20

TEMPERATURE REGULATION ..................................................

21

FOR YOUR INFORMATION....................................................

21-22

Start Up Conditions .................................................................

21

Condensate ...................................................................

21,22

Smoke/Odor .......................................................................

22

Thermal Expansion ............................................................

22

Strange Sounds..................................................................

22

Operational Conditions............................................................

22

Smelly Water ......................................................................

22

“Air” in Hot Water Faucets..................................................

22

High Temperature Shut Off System....................................

22

PERIODIC MAINTENANCE....................................................

23-25

Venting System Inspection ......................................................

23

Burner Inspection ....................................................................

23

Burner Cleaning ......................................................................

23

Housekeeping .........................................................................

23

Anode Rod Inspection .............................................................

24

Temperature-PressureRelief Valve Operation........................

24

Draining ...................................................................................

24

Drain Valve Washer Replacement...........................................

24

Service ....................................................................................

25

LEAKAGE CHECKPOINTS..........................................................

25

TROUBLESHOOTING .................................................................

26

REPAIR PARTS............................................................................

27

WARRANTY ............................................................................

Insert

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

ASME - American Society of Mechanical Engineers

UL - Underwriters Laboratories Inc.

This gas-firedwater heater is design certified by CSAINTERNATIONAL under American National Standard/CSA Standard for Gas Water Heaters for Manufactured Home Installation, ANSI Z21.10.1 • CSA 4.1 (current edition).

PREPARING FOR THE INSTALLATION

1.Read the “General Safety” section, page 3 of this manual first and then the entire manual carefully. If you don’t follow the safety rules, the water heater will not operate properly. It could cause DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.

This manual contains instructions for the installation, operation, and maintenance of the gas-firedwater heater. It also contains warnings throughout the manual that you must read and be aware of. All warnings and all instructions are essential to the proper operation of the water heater and your safety. Since we

cannot put everything on the first few pages, READ THE ENTIRE

MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER.

2.Instructions to Manufactured Home Manufacturers:

The installation must conform with the Mobile Homes Industrialized Building Construction standard CAN/CSA-Z240.4.1.

Instruction for replacement installation:

The installation must conform with these instructions and the local code authority having jurisdiction. In addition, installations shall comply with the Natural Gas and Propane Installation Code (CAN/CSA-B149.1-currentedition). This publication is available from the Canadian Standards Association, 5060 Spectrum Way, Suite 100 Mississauga, Ontario, Canada L4W 5N6.

3.If after reading this manual you have any questions or do not understand any portion of the instructions, call the local gas utility or the manufacturer whose name appears on the rating plate.

4.Carefully plan the place where you are going to put the water heater. Correct combustion, vent action, and vent pipe installation are very important in preventing death from possible carbon monoxide poisoning and fires, see Figures 1 and 2.

Examine the location to ensure the water heater complies with the “Locating the New Water Heater” section in this manual.

4

TYPICAL INSTALLATION

GET TO KNOW YOUR WATER HEATER - GAS MODELS

A

Vent Pipe

J

Drip Leg (Sediment Trap)

S

Flue Baffle

B

Securing Clamp

K

Manifold Door

T

Gas Control Valve/Thermostat

C

Anode (Not Shown)

L

Outer Door

U

Drain Valve

D

Hot Water Outlet

M

Union

V

Pilot and Main Burner

E

Outlet

N

Inlet Water Shut-offValve

W

Flue

F

Roof Jack

O

Cold Water Inlet

X

Air Duct Assembly

G

Gas Supply

P

Inlet Nipple

Y

Metal Drain Pan

H

Manual Gas Shut-offValve

Q

Temperature-PressureRelief Valve

Z

Thermostat Shield (optional)

I

Ground Joint Union

R

Rating Plate

ZZ

Piezo Igniter

* INSTALLINACCORDANCE

 

 

 

 

 

 

 

 

 

 

(T) GAS CONTROL VALVE/ THERMOSTAT

WITH LOCAL CODES.

 

 

 

 

*DRIP LEG AS REQUIRED BY LOCAL CODES.

TO VENT

TERMINATION

ON ROOF

Z THERMOSTAT

SHIELD (OPTIONAL)

(V) PILOT & MAIN BURNER

*ALL PIPING MATERIALS TO BE SUPPLIED BY CUSTOMERS.

FIGURE 1.

5

TYPICAL INSTALLATION

* MIXING VALVE USAGE ** FOR CLARITY, METAL DRAIN PAN NOT SHOWN

FIGURE 2.

This appliance has been design certified as complying with American National Standard/CSA Standard ANSI Z21.10.1 • CSA 4. 1 for water heaters and is considered suitable for:

Water (Potable) Heating: All models are considered suitable for water (potable) heating.

HOTTER WATER CAN SCALD:

Water heaters are intended to produce hot water. Water heated to a temperature which will satisfy space heating, clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon contact. Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the infirm, or physically/mentally handicapped. If anyone using hot water in your home fits into one of these groups or if there is a local code or state law requiring a certain temperature water at the hot water tap, then you must take special precautions. In addition to using the lowest possible temperature setting that satisfies your hot water needs, a means such as a *Mixing Valve should be used at the hot water taps used by these people or at the water heater. Mixing valves are available at plumbing supply or hardware stores. Consult a Qualified Installer or Service Agency. Follow mixing valve manufacturer’s instructions for installation of the valves. Before changing the factory setting on the thermostat, read the “Temperature Regulation” section in this manual, see Figures 36 and 37.

6

LOCATING THE NEW WATER HEATER

FACTS TO CONSIDER ABOUT THE LOCATION

Whether replacing an old water heater or putting the water heater in a new location, the following critical points must be observed.

This manufactured home gas-firedwater heater is for use in a manufactured home. You should carefully choose an indoor location for the new water heater, because the placement is a very important consideration for the safety of your occupants in the building and for the most economical use of the appliance.This water heater is for use only in a manufactured home and not intended for outdoor installation.

This water heater has been designed and certified as a direct vent (sealed combustion) unit and no draft diverter is to be used.

Minimum clearances between the water heater and combustible and noncombustible construction are 0” from sides, 0” from back, 4” (10.16 cm) from front of jacket to closet door and 27” (68.58 cm) from top of jacket to combustible material. Minimum vent clearances: 6” (15.24 cm). Provide 24” (60.96 cm) front clearance for servicing and adequate clearance between the jacket top and ceiling for servicing the flue area.

The combustion and ventilation air flow must not be obstructed.

Combustion air must be supplied from outside the manufactured home by way of the furnished 3” diameter (30 Gallon [113.56 Liter] and 40 Gallon [151.42 Liter]) or 4” diameter (50 Gallon [189.27 Liter]) air intake duct assembly. A 3 1/2” (8.89 cm) diameter (30 Gallon [113.56 Liter] and 40 Gallon [151.42 Liter]) or 4 1/2” (11.436 cm) diameter (50 Gallon [189.27 Liter]) floor opening below the water heater is required to accommodate the air intake duct assembly. Weight of the water heater on duct gasket seals the water heater to air intake duct assembly.

When a manufactured home is skirted, an air intake opening with a minimum free area of 32 square inches (81.28 square cm) must be provided in the skirt. If the opening is covered by louvers or screen, the total free area must be 32 square inches (81.28 square cm). Other gas fired appliance in the home will require additional free air openings; consult these manufacturers for correct sizing, see Figure 3.

FIGURE 3.

If the manufactured home is installed over a basement or crawlspace, combustion air must be supplied from outside the manufactured home. The combustion air intake piping can be 3” (7.62 cm) PVC for 30 Gallon (113.56 Liter) and 40 gallon (151.42 Liter) models and 4” (10.16 cm) PVC for 50 Gallon (189.27 Liter) models. The air intake piping cannot exceed a total of 30 feet (9.14 m) including vertical

and horizontal runs and have no more than 3 elbows. All horizontal runs require adequate support at 3 1/2 feet (106.68 cm) intervals., see Figure 4.

FIGURE 4.

The water heater should be secured to the floor and to the wall of the enclosure with the mounting brackets provided. For bracket location refer to Securing Water Heater to Floor and Wall” in the “Installing the New Water heater” section.

Installation of the water heater must be accomplished in such a manner that if the tank or any connections should leak, the flow will not cause damage to the structure. For this reason, it is not advisable to install the water heater in an attic or upper floor. When such locations cannot be avoided, a suitable metal drain pan should be installed under the water heater. Metal drain pans are available at your local hardware store. Such a metal drain pan must have a minimum length and width of at least 2 inches (51 mm) greater that the water heater dimensions and must be piped to an adequate drain. The pan must not restrict combustion air flow. When a metal drain pan is required, see installation instructions on page 9.

Water heater life depends upon water quality, water pressure and the environment in which the water heater is installed. Water heaters are sometimes installed in locations where leakage may result in property damage, even with the use of a metal drain pan piped to a drain. However, unanticipated damage can be reduced or prevented by a leak detector or water shut-offdevice used in conjunction with a piped metal drain pan.

7

These devices are available from some plumbing supply wholesalers and retailers, and detect and react to leakage in various ways:

Sensors mounted in the metal drain pan that trigger an alarm or turn off the incoming water to the water heater when leakage is detected.

Sensors mounted in the metal drain pan that turn off the water supply to the entire home when water is detected in the metal drain pan.

Water supply shut-offdevices that activate based on the water pressure differential between the cold water and hot water pipes connected to the water heater.

Devices that will turn off the gas supply to a gas water heater while at the same time shutting off its water supply.

A gas water heater cannot operate properly without the correct amount of air for combustion. Provide ventilation and combustion air by means of an air intake duct assembly as stated in “Water Heater Installation”. Never obstruct the flow of ventilation air. If you have any doubts or questions at all, call your gas supplier. Failure to provide the proper amount of combustion air can result in a fire or explosion and cause death, serious bodily injury, or property damage.

INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQUIDS (VAPORS) ARE LIKELY TO BE PRESENT OR STORED (GARAGES, STORAGE AND UTILITY AREAS, ETC.): Flammable liquids (such as gasoline, solvents, propane [LP or butane, etc.] and other substances such as adhesives, etc.) emit flammable vapors which can be ignited by a gas water heater’s pilot light or main burner. The resulting flashback and fire can cause death or serious burns to anyone in the area, as well as property damage. If installation in such areas is your only option, then the installation must be accomplished in a way that the pilot flame and main burner flame are elevated from the floor at least 18 inches (45.7 cm). While this may reduce the chances of flammable vapors, from a floor spill being ignited, gasoline and other flammable substances should never be stored or used in the same room or area containing a gas water heater or other open flame or spark producing appliance. NOTE: Flammable vapors may be drawn by air currents from other areas of the structure to the appliance.

Also, the water heater must be located and/or protected so it is not subject to physical damage by a moving vehicle.

Install water heater in accordance with the instruction manual and CAN/CSA B149.1-currentedition (Natural Gas and Propane Installation Code) and all local/ provincial codes.

To avoid injury, combustion and ventilation air must be taken from outdoors.

Do not place chemical vapor emitting products near water heater.

If this water heater will be used in beauty shops, barber shops, cleaning establishments, or self-servicelaundries with dry cleaning equipment, it is imperative that the water heater or water heaters be installed so that combustion and ventilation air be taken from outside these areas.

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. The results can be hazardous, and also cause product failure.

INSULATION BLANKETS

This water heater must not be installed directly on carpeting. Carpeting must be protected by metal or wood panel beneath the appliance extending beyond the full width and depth of the appliance by at least 3 inches (76.2 mm) in any direction, or if the appliance is installed in an alcove or closet, the entire floor must be covered by the panel. Failure to heed this warning may result in a fire hazard.

Do not obstruct water heater air intake with insulating blanket.

Gas and carbon monoxide detec tors are available.

Install water heater in accordance with the instruction manual.

8

Insulation blankets are available to the general public for external use on gas water heaters but are not necessary with these products. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank heaters. Your water heater meets or exceeds the minimum efficiency requirements with respect to insulation and standby loss requirements, making an insulation blanket unnecessary.

Should you choose to apply an insulation blanket to this heater, you should follow these instructions (For identification of components mentioned below, see Figure 1). Failure to follow these instructions can restrict the air flow required for proper combustion, potentially resulting in fire, asphyxiation, serious personal injury or death.

Do not apply insulation to the top of the water heater, as this will interfere with safe operation of the draft hood.

Do not cover the outer door, thermostat or temperature & pressure relief valve.

Do not allow insulation to come within 2” (50.8 mm) of the floor to prevent blockage of combustion air flow to the burner.

Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.

Do obtain new warning and instruction labels from the manufacturer for placement on the blanket directly over the existing labels.

Do inspect the insulation blanket frequently to make certain it does not sag, thereby obstructing combustion air flow.

INSTALLING THE NEW WATER HEATER

WATER HEATER INSTALLATION

1.To locate the position of the 3 1/2” (8.89 cm) or 4 1/2” (11.43 cm) hole to be cut in the floor, see Figures 5 and 6.

 

FIGURE 6.

 

2. If you have found that the water heater is being installed in an

 

area which, if the water heater was to leak, would cause damage

 

and have elected to install a metal drain pan refer to Figures 7, 8

 

and 9 on page 10. If you are not installing a drain pan go directly

 

to the next step.

FIGURE 5.

NOTE: Clearances from combustible or non combustible surface to

jacket will change template dimensions.

9

4.Set the water heater in place against the lip of the duct assembly as shown in Figure 11.

 

FIGURE 11.

 

5. Secure the water heater to the duct assembly using the screw

FIGURE 7.

provided.

 

 

NOTE: See pages 12 and 13 for installing an air intake through

 

an outside wall when the manufactured home is located over a

 

basement or crawl space.

FIGURE 8.

FIGURE 9.

3.Insert the duct assembly as shown in Figure 10 with lip facing forward, and using only nails, secure the duct assembly to the floor.

FIGURE 10.

SECURING WATER HEATER TO FLOOR AND WALL

The water heater must be secured to the floor and to the wall of the enclosure with the three mounting brackets and screws packaged in the carton with the water heater. The two small brackets are used to attach the water heater to the floor and the one large bracket is used to secure the top of the water heater to the wall.

Because of installation variances these brackets can be located at any points around the circumference of the jacket. When the bracket locations are determined using the 1/8 inch drill bit for a pattern, drill only through the outer jacket of the water heater. Then using the screws provided, secure the bracket to the water heater, floor and wall, see Figure 12.

FIGURE 12.

10