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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 certifi cation applies to
all residential gas water heat-
ers 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
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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-related messages 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 instal
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GENERAL SAFETY 3
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TABLE OF CONTENTS SAFE INSTALLATION, USE AND SERVICE . . . . . . . . . . . . . 2 High rise vent arrangement . . . . . . . . . . . . . . . . . . . . . . . 16 GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Standard vent arrangement . . . . . . . . . . . . . . . . . . . . . . . 17 TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Securing vent termination assembly to the exterior wall . 17 INTRODUCTION . . . . . . . . . . . . . . . . . .
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INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above fi nished grade in the area of the venting, including but not limited to
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TYPICAL INSTALLATION GET TO KNOW YOUR WATER HEATER REPLACEMENT PARTS 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 THERMAL INLET PIPE EXPANSION TANK INLET VALVE VACUUM RELIEF VALVE INSTALL THERMAL EXPANSION TANK IF WATER HEATER IS UNION INSTALLED IN A CLO
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MIXING VALVE USAGE NON-SCALD TEMPERED POTABLE WATER TEMPERING VALVE SHUT-OFF VALVE COLD WATER INLET NON-TEMPERED WATER SUPPLY NON-TEMPERED WATER 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. THE HOT AND COLD FITTING ASSEMBLIES (PART # 9001262) CAN BE ORDERED THROUGH THE MANUFACTURER. DRAIN VALVE DRAIN PAN 6” MAXIMUM AIR
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LOCATING THE NEW WATER HEATER • Sensors mounted in the drain pan that turn off the water sup- FACTS TO CONSIDER ABOUT THE LOCATION ply to the entire home when water is detected in the drain pan. Carefully choose an indoor location for the new water heater, because the placement is a very important consideration for the • Water supply shut-off devices that activate based on the wa- safety of the occupants in the building and for the most eco- ter pressure differential between the cold water an
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Confi ned 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 ter- mination. Make certain to observe vent location limitation, see Figures 3, 4 & 11. INSULATION BLANKETS Minimum clearances between the water heater and combustible and noncombustible construction are: 0 in. Insulation blankets available
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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 This water heater shall not be connected to any heating systems There may be hidden damage caused in transit. Check to or component(s) used with a non-potable water heating appli- be certain all parts of the venting system, as listed below,
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FIGURE 6 HOT WATER COLD WATER OUTLET INTLET Fit pipe insulation over the incoming cold water line and the hot SHUTOFF water line. Make sure that the insulation is against the top cover UNION VALVE of the heater. 3/4” SWEAT UNION Fit T & P valve insulation over valve. Make sure that the insula- FITTING tion does not interfere with the lever of the T & P valve. 3/4” SWEAT FITTING Secure all insulation using tape. TEMPERATURE AND PRESSURE RELIEF VALVE TEMPERATURE-PRESSURE RELIEF VALVE DISCH
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distance below the structural fl oor. Be certain that no contact is 4. When the system requires water for space heating at made with any live electrical part. The discharge opening must temperatures higher than required for domestic water not be blocked or reduced in size under any circumstances. purposes, a tempering valve must be installed, see Figure 7 Excessive length, over 30 ft. (9.14m), or use of more than four for suggested piping arrangement. elbows can cause restriction and reduce
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minimum inlet gas pressure shown on the rating plate is that which will permit fi ring at rated input. All gas piping must comply with local codes and ordinances or with the National Fuel Gas Code ANSI Z223.1/NFPA 54 which- ever applies. Copper and brass tubing and fi ttings (except tin lined copper tubing) shall not be used. If the gas control valve is subjected to pressures exceeding 1/2 psi (3.5 kPa), the damage to the gas control valve could result in a fi re or explosion from leaking gas.
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SEDIMENT TRAPS FILLING THE WATER HEATER Never use this water heater unless it is completely full of water. To prevent damage to the tank, the tank must be fi lled with water. Water must fl ow from the hot water faucet before turning “ON” gas to the water heater. A sediment trap shall be installed as close to the inlet of the To fi ll the water heater with water: water heater as practical at the time of water heater installation. 1. Close the water heater drain valve by turning the handle to
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COMBUSTION AIR AND VENTILATION When determining the installation location for a direct vent water heater, snow accumulation and drifting should be considered in areas where applicable. VENT TERMINAL CLEARANCES 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/NFPA 54 as follows: *Minimum 9 in. (23 cm) for appliances with Minimum 18 in. (46 cm) 10,000 btuh (3 Kw) to 50,000 btuh (15
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FIGURE 14 LOCATING CLEARANCE HOLE FOR VENT Cut a clearance hole, approximately 7 in. (178mm) in diameter, through the exterior wall for the vent assembly. The minimum height should not be less than 68 in. (1.72m) for 40 gal. models and not less than 76 in. (1.93m) for 50 gal. and 50 gal. Hi-Input models, as measured from the hole center to bottom of water FIGURE 12 heater. The maximum height recommended is 80 in. (2.03m) or in compliance with Figure 16. Be sure venting is properly connecte
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STANDARD VENT ARRANGEMENT UNCOMPRESSING THE CORRUGATED TUBING 3.6 in. 1. Pull the 3-1/8 in. (80mm) corrugated tube towards the water 17 in. (432mm) MIN.,* (91mm) WALL 80 in. (2.03m) MAX. 2.6 in. heater and leave some length over the water heater’s center (67mm) for bending. 2. Pull the 6 in. (152mm) corrugated tube toward the water heater and leave it 1 in. (25mm) shorter than 3-1/8 in. (80mm) tube. 3. Make sure there are two springs evenly spaced at the bend in the tube. 2.1 in. (54.5mm) 4
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Pull and connect the 3-1/8 in. (80mm) corrugated tube to the water heater’s fl ue tube reducer with hi-temp red silicone (included) and gear clamp. Make sure this connection is tight and leak proof. TOP VIEW *The sealant between 3-1/8 in. (80mm) corrugated tube and water heater’s fl ue tube reducer must be hi-temp red silicone or 90° MAXIMUM other material suitable for 600°F (315°C) continuous service. BEND FIGURE 26 CONDITION 2: Where fl oor joists impede venting, a rise to complete the vent
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FOR YOUR SAFETY READ BEFORE LIGHTING BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES A. This appliance has a pilot which is lit by a piezo-electric • If you cannot reach your gas supplier, call the fire spark gas ignition system. Do not open the inner door of department. the appliance and try to light the pilot by hand. C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn B. BEFORE LIGHT
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TEMPERATURE REGULATION TEMPERATURE REGULATION Time to Produce 2nd & 3rd Temperature Setting Degree Burns on Adult Skin VERY HOT= approx. 160°F About 1/2 second HOT WATER CAN SCALD: Water heaters are intended to C = approx. 150°F About 1-1/2 seconds produce hot water. Water heated to a temperature that will B = approx. 140°F Less than 5 seconds satisfy space heating, clothes washing, dish washing, and other sanitizing needs can scald and permanently injure you upon A = approx. 130°F About 30
