Instruction Manual RESIDENTIAL GAS WATER HEATERS POWER VENTED GAS MODELS W/HOT SURFACE IGNITION NOT FOR USE IN MANUFACTURED (MOBILE) HOMES A DIVISION OF A. O. SMITH CORPORATION Ashland City, TN 37015 w w w.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. C3 Technology® Gas Water Heaters meet the new ANSI Z21.10.
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.
GENERAL SAFETY 3
TABLE OF CONTENTS FOR YOUR INFORMATION ..................................................... 22 Start Up Conditions ........................................................ 22 Condensate .................................................................... 22 Smoke/Odor .................................................................... 22 Thermal Expansion ......................................................... 22 Strange Sounds ..............................................................
TYPICAL INSTALLATION GET TO KNOW YOUR WATER HEATER - GAS MODELS A B C D E F G H J Vent Pipe–Exhaust Vent Terminal Vent Adapter-Rubber Boot Blower Assembly Cold Water Inlet Inlet Water Shut-off Valve Union Inlet Dip Tube Anode** K L M N O P Q R S T U Hot Water Outlet Outlet Receptacle (115 VAC) Temperature-Pressure Relief Valve Flue Flue Baffle Assembly** Insulation Control Harness Rating Plate Gas Supply Manual Gas Shut-off Valve Ground Joint Union V W X Y Z AA BB CC DD EE Drip Leg (Sediment Trap) Drai
TYPICAL INSTALLATION MIXING VALVE USAGE FIGURE 2. This appliance has been design certified as complying with American National Standard/CSA Standard for water heaters and is considered suitable for: 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.
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. FIGURE 3.
and 12" (30.5 cm) from the top. (Standard clearance.) If clearances stated on the heater differ from standard clearances, install water heater according to clearances stated on the heater. flammable in many cases, will also react to form corrosive hydrochloric acid when exposed to the combustion products of the water heater. The results can be hazardous, and also cause product failure.
Chemical vapor corrosion of the flue, blower assembly and vent system may occur if air for combustion contains certain chemical vapors. Spray can propellants, cleaning solvents, refrigerator and air conditioner refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes, bleach and process chemicals are typical compounds which are potentially corrosive. 2.
INSTALLING THE NEW WATER HEATER 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-pressure relief 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.
Figure 10 shows the typical attachment of the water piping to the water heater. The water heater is equipped with 3/4 inch NPT water connections. 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.
GAS PIPING When installed at elevations above 7,700 feet (2,347 meters), input rating should be reduced at the rate of 4 percent for each 1,000 feet (305 meters) above sea level which requires replacement of the burner orifice in accordance with National Fuel Gas Code ANSI Z223.1/ NFPA 54. Contact your local gas supplier for further information.
Never use this water heater unless it is completely full of 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” gas to the water heater. SEDIMENT TRAPS To fill the water heater with water: 1. Close the water heater drain valve by turning the handle to the right (clockwise). The drain valve is on the lower front of the water heater. 2. Open the cold water supply valve to the water heater.
VENT CONNECTIONS TO BLOWER ASSEMBLY VENTING AND INSTALLATION Figure 15 shows the optimal placement of the 2" to 3" or 3" to 4" reducer; however, the vent can be reduced at any point in the vent system as long as the maximum and minimum vent length requirements are met. Plan the layout of the vent system from the vent termination to the water heater considering all of the 90° and 45° elbows plus the number of feet of pipe that would be needed to install the total vent system.
The unit may be vented horizontally through a wall or vertically through the roof. Pipe runs must be adequately supported along both vertical and horizontal runs as follows: Even the flue gas temperature leaving the blower is between 140°F (69°C) and 175°F (79°C), some installations will have water condensate in the vent piping. If this occurs, then adequate means of draining and disposing of the condensate needs to be made by the installer.
For 4" Venting, the maximum equivalent feet of pipe allowed is 160 feet (48.8 m). This does not include the Vent Termination (supplied locally) for the water heater. For the 4" venting, one 90° elbow is approximately equal to 8 feet (2.4 m). One 45° elbow is approximately equal to 4 feet (1.2 m). It is recommended that at least 2 feet (0.6 m) of spacing be used in between all 45° elbows and all 90°elbows.
FIGURE 16. This unit can vent through 2", 3" or 4" nonmetallic pipe and fittings. VERTICAL VENT TERMINATION RESTRICTIONS The vent pipe installation can be started from either the blower discharge or the termination wall. Keep in mind the total vent system (pipe and elbows) when installing the vent system, see VENTING AND INSTALLATION, pages 14 - 16. 1. Minimum of twelve 12" (30.5 cm) above the roof or twelve 12" (30.5 cm) above the anticipated snow level.
PRIMER VENT PIPE PREPARATION It is recommended that Tetrahydrofuran (THF) be used to prepare the surfaces of pipe and fittings for solvent welding. Do not use water, rags, gasoline or any other substitutes for cleaning PVC or CPVC surfaces. A chemical cleaner such as MEK may be used. 1. INITIAL PREPARATION A. Make sure the solvent cement you are planning to use is designed for the specific application you are attempting. B.
B. Deburring Use a knife, plastic pipe deburring tool, or file to remove burrs from the end of small diameter pipe. Be sure to remove all burrs from around the inside as well as the outside of the pipe. A slight chamfer (bevel) of about 10°15° should be added to the end to permit easier insertion of the pipe into the end of the fitting. Failure to chamfer the edge of the pipe may remove cement from the fitting socket, causing the joint to leak. STEP E F.
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. 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. Do NOT try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance area for gas.
TEMPERATURE REGULATION Due to the nature of the typical gas water heater, the water temperature in certain situations may vary up to 30°F (16.7°C) higher or lower at the point of use such as, bathtubs, showers, sink, etc. The water temperature setting was factory set at the lowest button decreases temperature temperature; Pressing the “COOLER” and pressing the “HOTTER” Any water heater’s intended purpose is to heat water.
FOR YOUR INFORMATION STRANGE SOUNDS Possible noises due to expansion and contraction of some metal parts during periods of heat-up and cool-down do not necessarily represent harmful or dangerous conditions. START UP CONDITIONS CONDENSATE Whenever the water heater is filled with cold water, some condensate will form while the burner is on. A water heater may appear to be leaking when in fact the water is condensate.
PERIODIC MAINTENANCE proper combustion. A visual inspection of the main burner and HSI igniter assembly should also be done at least once a year, see Figure 20. VENTING SYSTEM INSPECTION Soot build-up indicates a problem that requires correction before further use. Turn “OFF” gas to water heater and leave off until repairs are made, because failure to correct the cause of the sooting can result in a fire causing death, serious injury, or property damage. FIGURE 20.
If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve with a new one. INSTALLED IN SUITABLE AREA: To insure sufficient ventilation and combustion air supply, proper clearances from the water heater must be maintained. See “Locating the New Water Heater” section.
8. Follow the lighting instructions in the “Lighting” section to restart the water heater. SERVICE If a condition persists or you are uncertain about the operation of the water heater contact a service agency. Use this guide to check a “Leaking” water heater. Many suspected “Leakers” are not leaking tanks. Often the source of the water can be found and corrected.
REPAIR PARTS LIST Key No.
TROUBLESHOOTING GUIDELINES TROUBLE SHOOTING Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician. Read the GENERAL SAFETY INFORMATION section first. PROBLEM LED STATUS SOLUTION A B C An open earth ground circuit to the ignition system. 1. Check that the earth ground connection is properly connected. 2. Check that the ground conductor on the water heater is properly connected.
TROUBLESHOOTING GUIDELINES These guidelines should be utilized by a qualified service agent. When calling for service notify the service agent that this is a “Flammable Vapor Ignition Resistant” Product.
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LIMITED RESIDENTIAL GAS WARRANTY b. Shipping and delivery charges for forwarding the new water heater or replacement part from the nearest distributor and returning the claimed defective heater or part to such distributor except in the state of California where such charges are the manufacturer’s responsibility. c. All cost necessary or incidental for handling and administrative charges, and for any materials and/or permits required for installation of the replacement heater or part.
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