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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 Vent assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Securing vent termination assembly to the exterior wall . 16 TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Uncompressing the corrugated tubing . . . . . . . . . . . . . . . 16 INTRODUCTION . . . . . . . . . . . . . . . . .
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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 TRIM PLATE EXPANSION TANK (OUTSIDE) TRIM PLATE (INSIDE) INLET VALVE VACUUM RELIEF VALVE INSTALL THERMAL EXPANSION TANK IF
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MIXING VALVE USAGE NON-SCALD TEMPERED POTABLE WATER TEMPERING VALVE SHUT-OFF VALVE (*ALSO CALLED MIXING 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. DRAIN VALVE DRAIN PAN 6” MAXIMUM AIR GAP TO SUITABLE DRAIN FIGURE 2 This appliance has been design certifi
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LOCATING THE NEW WATER HEATER • Sensors mounted in the drain pan that trigger an alarm or FACTS TO CONSIDER ABOUT THE LOCATION turn off the incoming water to the water heater when leakage is detected. Carefully choose an indoor location for the new water heater, because the placement is a very important consideration for the • Sensors mounted in the drain pan that turn off the water sup- safety of the occupants in the building and for the most eco- ply to the entire home when water is detect
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VENT TERMINATION Before installing water heater determine placement of vent ter- mination. 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 INSULATION BLANKETS to combustible and noncombustible material. Minimum vent clearance: 25mm (1 i
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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 *mixing valve must be installed, see Figure 7 for Excessive length, over 30 ft. (9.14m), or use of more than four suggested piping arrangement. elbows can cause restriction and reduce t
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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 “Natural Gas and Propane Installation Code” CAN/ CSA-B149.1 whichever 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 fr
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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 drip leg (sediment trap) shall be installed as close to the inlet of To fi ll the water heater with water: the water heater as practical at the time of water heater installa- 1. Close the water heater drain valve by turning the hand
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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 “Natural Gas and Propane Installation Code” CAN/CSA- B149.1 as follows: FIGURE 11 Be sure venting is properly connected to prevent escape of dan- gerous fl ue ga
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LOCATING CLEARANCE HOLE FOR VENT Cut a clearance hole, approximately 178mm (7 in.) in diameter, through the exterior wall for the vent assembly. The recommended distance, measured from the hole center to bottom of water heater, is 1.72m (68 in.) for 40 gal. models and 1.93m (76 in.) for 50 gal., 50 gal. Hi-Input and 75 gal. models. The maximum distance recommended is 2.03m (80 in.) or in compliance with Figure 16. Where the wall is combustible and the wall thickness is over 356mm (14 in.)
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STANDARD VENT ARRANGEMENT UNCOMPRESSING THE CORRUGATED TUBING 3.6 in. 1. Pull the inner corrugated tube towards the water heater 17 in. (432mm) MIN.,* (91mm) WALL 80 in. (2.03m) MAX. 2.6 in. and leave some length over the water heater’s center for (67mm) bending. 2. Pull the outer corrugated tube toward the water heater and leave it 25mm (1 in.) shorter than the inner corrugated tube. 3. Make sure there are two springs evenly spaced at the bend in the tube. 4. Use metal hangers to keep venti
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TOP VIEW 90° MAXIMUM BEND FIGURE 23 FIGURE 26 CONDITION 2: Apply hi-temp red silicone (included) around the collar on air Where fl oor joists impede venting, a rise or drop to complete the manifold box. Pull corrugated vent tube all the way on to collar vent termination is possible. All installations require 25mm (1 in.) and secure with one sheet metal screw (approx. 19mm (3/4 clearance to combustibles. in.) up from edge of vent tube. Pull gear clamp past screw and Note: tighten. A. The max
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FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance has a pilot that is lit by a piezo-electric spark gas ignition system. Do not open the inner door of the appliance and try to light the pilot by hand. B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gases are heavier than air and wi
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TEMPERATURE REGULATION TEMPERATURE REGULATION Time to Produce 2nd & 3rd Temperature Setting Degree Burns on Adult Skin VERY HOT= approx. 71°C About 1/2 second HOT WATER CAN SCALD: Water heaters are intended to (160°F) produce hot water. Water heated to a temperature that will C = approx. 66°C (150°F) About 1-1/2 seconds satisfy space heating, clothes washing, dish washing, and other B = approx. 60°C (140°F) Less than 5 seconds sanitizing needs can scald and permanently injure you upon cont
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FOR YOUR INFORMATION THERMAL EXPANSION EXTERNAL DAMAGE Do not operate the water heater until it has been fully checked out by a qualifi ed technician, if the water heater: • Has been exposed to fi re or damage. • Displays evidence of sooting. • Produces steam or unusually hot water. If the water heater has been fl ooded it must be replaced. START UP CONDITIONS Water supply systems may, because of such events as high line pressure, frequent cut-offs, the effects of water hammer among NEVER OPERAT
