A.O. Smith 186589-004 User Manual

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Instruction Manual

RESIDENTIAL GAS WATER HEATERS

DIRECT VENT GAS MODELS GDV/GDVT

NOT FOR USE IN MANUFACTURED (MOBILE) HOMES

A DIVISION OF A. O. SMITH CORPORATION

Ashland City, TN 37015

www.hotwater.com

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.

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 CANADA 0608

PART NO. 186589-004REV. B

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.

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 Installer: A qualified installer must have ability equivalent to a licensed tradesman in the fields of plumbing, air supply, venting and gas supply, including a thorough understanding of the requirements of the“Natural Gas and Propane Installation Code” CAN/CSA-B149.1as it relates to the installation of gas fired water heaters. The qualified installer 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: A service agency also must have ability equivalent to a licensed tradesman in the fields of plumbing, air supply, venting and gas supply, including a thorough understanding of the requirements of the“Natural Gas and Propane Installation Code” CAN/CSA-B149.1as it relates to the installation of gas fired water heaters. The service agency 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.

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GENERAL SAFETY

3

TABLE OF CONTENTS

SAFE INSTALLATION, USE AND SERVICE . . . . . . . . . . . . . 2 GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Preparing for the installation . . . . . . . . . . . . . . . . . . . . . . . 4 TYPICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6Get to know your water heater . . . . . . . . . . . . . . . . . . . . . 5 Replacement parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Mixing valve useage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 LOCATING THE NEW WATER HEATER . . . . . . . . . . . . . . .7-8Facts to consider about location . . . . . . . . . . . . . . . . . . . . 7 Insulation blankets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ventilation for appliances located in confined spaces . . . . 8 Vent termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 INSTALLING THE NEW WATER HEATER. . . . . . . . . . . . .9-17Required ability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Inspect shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Water piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 T & P valve and pipe insulation (if supplied) . . . . . . . . . . 10Temperature-pressurerelief valve . . . . . . . . . . . . . . . . . . 10 Water (potable) heating and space heating. . . . . . . . . . . .11 Closed water system . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Sediment traps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Filling the water heater . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 High altitude installations . . . . . . . . . . . . . . . . . . . . . . . . . 13 Combustion air and ventilation . . . . . . . . . . . . . . . . . . . . 14 Vent terminal clearances . . . . . . . . . . . . . . . . . . . . . . . . . 14 Vent connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Locating clearance hole for vent . . . . . . . . . . . . . . . . . . . 15 High rise vent arrangement . . . . . . . . . . . . . . . . . . . . . . . 15 Standard vent arrangement . . . . . . . . . . . . . . . . . . . . . . . 16

Vent assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Securing vent termination assembly to the exterior wall . 16 Uncompressing the corrugated tubing. . . . . . . . . . . . . . . 16 Vent restricter plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Offset vent arrangement Condition 1. . . . . . . . . . . . . . . . 17 Offset vent arrangement Condition 2. . . . . . . . . . . . . . . . 17

LIGHTING & OPERATING LABEL . . . . . . . . . . . . . . . . . . . . 18 TEMPERATURE REGULATION . . . . . . . . . . . . . . . . . . . . . . 19 Temperature regulation . . . . . . . . . . . . . . . . . . . . . . . . . . 19 FOR YOUR INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 20-21External damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Start up conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Condensate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Smoke/odor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Thermal expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Strange sounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Smelly water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 “Air” in hot water systems . . . . . . . . . . . . . . . . . . . . . . . . 21 High water temperature shut off system . . . . . . . . . . . . . 21 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-24Venting system inspection . . . . . . . . . . . . . . . . . . . . . . . . 22 Pilot and main burner. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Temperature & Pressure relief valve . . . . . . . . . . . . . . . . 23 Draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Cathodic protection - anode. . . . . . . . . . . . . . . . . . . . . . . 23 Anode rod maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 23 Drain valve washer replacement . . . . . . . . . . . . . . . . . . . 24 LEAKAGE CHECKPOINTS. . . . . . . . . . . . . . . . . . . . . . . . . . 25 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 TROUBLESHOOTING GUIDELINES . . . . . . . . . . . . . . . .26-27NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29-30

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

GAMA

- Gas Appliance Manufacturer’s Association

UL

- Underwriters Laboratories Inc.

This gas-firedwater heater is design certified by Underwriters Laboratories Inc. under American National Standard/CSA Standard for Gas Water Heaters 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.The installation must conform with these instructions and the local code authority having jurisdiction. In the absence of local codes, installations shall comply with the “Natural Gas and Propane Installation Code” CAN/CSA-B149.1.This publication is available from the Canadian Standards Association, 5060 Spectrum Way, 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.

5.In Earthquake Zones the water heater must be braced, anchored, or strapped to avoid moving during an earthquake. Contact local utilities for code requirements in your area.

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TYPICAL INSTALLATION

GET TO KNOW YOUR WATER HEATER

 

REPLACEMENT PARTS

TRIM PLATE (OUTSIDE)

TRIM PLATE (INSIDE)

HOT WATER

OUTLET PIPE

ANODE

FLUE BAFFLE

GAS SUPPLY

LINE

MAIN MANUAL

GAS SHUTOFF

VALVE

GROUND-JOINT

UNION

DIRT LEG

OUTER DOOR

ALL PIPING MATERIALS TO BE

SUPPLIED BY CUSTOMER.

Replacement parts may be ordered through authorized servicers or distributors. When ordering parts, provide complete model and serial numbers (see rating plate), quantity and name of part desired (as listed in Figure 1). Standard hardware items may be purchased locally.

COLD WATER

INLET PIPE

INLET VALVE

UNION

THERMAL

EXPANSION

TANK

INLET DIP

TUBE

TEMPERATURE

AND PRESSURE

RELIEF VALVE

DISCHARGE PIPE (DO NOT CAP OR PLUG)

GAS CONTROL

KNOB

WATER

TEMPERATURE

ADJUSTING DIAL

DRAIN VALVE

DRAINPAN

6” MAXIMUM AIR GAP

VACUUM RELIEF

VALVE

INSTALL PER LOCAL CODES.

THERMAL

EXPANSION TANK

INSTALL THERMAL EXPANSION TANK IF WATER HEATER IS INSTALLED IN A CLOSED SYSTEM.

GAS PILOT & MAIN BURNER

PILOT

THERMOCOUPLE PIEZO ELECTRODE

THERMOSTAT

GAS CONTROL

FLOOR DRAIN

FIGURE 1

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MIXING VALVE USAGE

NON-SCALD

 

 

 

TEMPERED POTABLE WATER

 

 

 

TEMPERING VALVE

 

SHUT-OFFVALVE

(*ALSO CALLED MIXING VALVE)

 

 

COLD WATER INLET

NON-TEMPEREDWATER SUPPLY

 

 

 

 

 

 

 

 

 

 

 

NON-TEMPEREDWATER RETURN

 

 

 

 

SUGGESTED PIPING

ARRANGEMENT FOR

TOP CONNECTIONS

TEMPERATURE-PRESSURE

RELIEF VALVE

GAS SUPPLY

DISCHARGE PIPE (DO NOT CAP OR PLUG)

CERTAIN MODELS ARE EQUIPPED WITH

SIDE PLUMBING CONNECTIONS FOR

SPACE HEATING.

DRAIN VALVE

DRAIN PAN

6” MAXIMUM AIR GAP

TO SUITABLE DRAIN

FIGURE 2

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 and Space Heating: All models are considered suitable for water (potable) heating and space 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.

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LOCATING THE NEW WATER HEATER

FACTS TO CONSIDER ABOUT THE LOCATION

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. This water heater is not for use in manufactured (mobile) homes or outdoor installation.

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

1.Select a location indoors as close as practical to the vent terminal or location to which the water heater vent piping is going to be connected, and as centralized with the water piping system as possible.

2.Selected location must provide adequate clearances for servicing and proper operation of the water heater.

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

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

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

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 or any property. 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 drain pan should be installed under the water heater. Drain pans are available at your local hardware store. Such a drain pan must have a minimum length and width of at least 51mm (2 in.) greater that the water heater dimensions and must be piped to an adequate drain. The pan must not restrict combustion air flow.

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 drain pan piped to a drain. The manufacturer assumes no liability for damages resulting from leaks. However, unanticipated damage can be reduced or prevented by a leak detector or water shutoff device used in conjunction with a piped drain pan. These devices, strongly recommended for installations where damage from a leak is possible, are available from some plumbing supply wholesalers and retailers, and detect and react to leakage in various ways:

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 76mm (3 in.) 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.

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INSULATION BLANKETS

Insulation blankets available to the general public for external use on gas water heaters are not necessary with this product. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. Your Water heater meets or exceeds the National Appliance Energy Conservation Act standards 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 (See Figure 1 for identification of components mentioned below). Failure to follow these instructions can restrict the air flow required for proper combustion, resulting in fire, asphyxiation, serious personal injury or death.

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

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

VENTILATION FOR APPLIANCES LOCATED IN CONFINED SPACES

FIGURE 3

Confined Space is a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 cm per kW) of the aggregate input rating of all appliances installed in that space.

VENT TERMINATION

Before installing water heater determine placement of vent termination.

Make certain to observe vent location limitation, see Figures 3, 4 & 12.

Minimum clearances between the water heater and combustible and noncombustible construction are: 0mm (0 in.) from sides, 0mm (0 in.) from back, 102mm (4 in.) from front of jacket to closet door and 508mm (20 in.) from top of jacket to combustible and noncombustible material. Minimum vent clearance: 25mm (1 in.)*. Provide 915mm (3 ft.) front clearance for servicing and adequate clearance between the jacket top & ceiling for servicing the flue area, see Figure 4.

* Where the wall is combustible and the wall thickness is over 356mm (14 in.), 25mm (1 in.) clearance to combustible materials around the vent terminal is needed. The first 356mm (14 in.) is zero clearance.

Make certain the vent locations comply with the “Natural Gas and Propane Installation Code” CAN/CSA-B149.1and/or local codes. There is some important information shown in Figure 12.

For a second or more direct vent unit, the distance between vent terminals must be a minimum of 305mm (12 in.).

FIGURE 4

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INSTALLING THE NEW WATER HEATER

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING AND GAS SUPPLY ARE REQUIRED.

INSPECT SHIPMENT

There may be hidden damage caused in transit. Check to be certain all parts of the venting system, as listed below, are present. CAUTION!!! IF THERE ARE ANY DAMAGED

PARTS, DO NOT INSTALL THIS WATER HEATER. REPORT ANY SHORTAGE TO YOUR DISTRIBUTOR OR DAMAGE TO YOUR CARRIER.

GENERAL

The installation must conform to these instructions and the local code authority having jurisdiction. In the absence of local codes, the installation must comply with the current editions of the “Natural Gas and Propane Installation Code” CAN/CSA-B149.1.The code is available from the Canadian Standards Association, 5060 Spectrum Way, Mississauga, Ontario, Canada, L4W 5N6.

WATER PIPING

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, cleaning 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, see Figure 2. Valves for reducing point of use temperature by mixing cold and hot water are also available:

Consult a Qualified Installer or Service Agency. Follow manufacturer’s instructions for installation of the valves. Before changing the factory setting on the thermostat, read the “Temperature Regulation” section in this manual.

This water heater shall not be connected to any heating systems or component(s) used with a non-potablewater heating appliance.

All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

Toxic chemicals, such as those used for boiler treatment shall not be introduced into this system.

When the system requires water for space heating at temperatures higher than required for domestic water purposes, a *mixing valve must be installed. Please refer to Figure 2 for suggested piping arrangement.

Water supply systems may, because of such events as high line pressure, frequent cut-offs,the effects of water hammer among others, have installed devices such as pressure reducing valves, check valves, back flow preventers, etc. to control these types of problems. When these devices are not equipped with an internalby-pass,and no other measures are taken, the devices cause the water system to be closed. As water is heated, it expands (thermal expansion) and closed systems do not allow for the expansion of heated water.

The water within the water heater tank expands as it is heated and increases the pressure of the water system. If the relieving point of the water heater’s temperature-pressurerelief valve is reached, the valve will relieve the excess pressure.The temperature-pressure relief valve is not intended for the constant relief of thermal expansion. This is an unacceptable condition and must be corrected.

It is recommended that any devices installed which could create a closed system have a by-passand/or the system have an expansion tank to relieve the pressure built by thermal expansion in the water system. Expansion tanks are available for ordering through a local plumbing contractor. Contact the local water supplier and/or a service agency for assistance in controlling these situations.

NOTE: To protect against untimely corrosion of hot and cold water fittings, it is strongly recommended thatdi-electricunions or couplings be installed on this water heater when connected to copper pipe.

All gas piping must comply with local codes and ordinances or with the “Natural Gas and Propane Installation Code” CAN/CSA-B149.1whichever applies. Copper and brass tubing and fittings (except tin lined copper tubing) shall not be used.

9

HOT WATER

OUTLET

UNION

3/4” SWEAT FITTING

DRAIN VALVE

FLOOR DRAIN

FIGURE 5

COLD WATER

INTLET

SHUTOFF

VALVE

UNION

3/4” SWEAT FITTING

TEMPERATURE AND PRESSURE RELIEF VALVE

DISCHARGE PIPE (DO NOT CAP OR PLUG)

DRAIN PAN

6” MAXIMUM AIR GAP

Figure 5 shows the typical attachment of the water piping to the water heater. The water heater is equipped with 3/4“ NPT water connections.

NOTE: If using copper tubing, solder tubing to an adapter before attaching the adapter to the cold water inlet connection. Do not solder the cold water supply line directly to the cold water inlet. It will harm the dip tube and damage the tank.

T & P VALVE AND PIPE INSULATION (IF SUPPLIED)

Remove insulation for T & P valve and pipe connections from carton.

FIGURE 6

Fit pipe insulation over the incoming cold water line and the hot water line. Make sure that the insulation is against the top cover of the heater.

Fit T & P valve insulation over valve. Make sure that the insulation does not interfere with the lever of the T & P valve.

Secure all insulation using tape.

TEMPERATURE-PRESSURERELIEF VALVE

This heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer.

The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.

If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph.

The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater input rate as shown on the model rating plate.

For safe operation of the water heater, the relief valve must not be removed from its designated opening nor plugged.

The temperature-pressurerelief valve must be installed directly into the fitting of the water heater designed for the relief valve. Position the valve downward and provide tubing so that any discharge will exit only within 152mm (6 in.) above, or at any

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