A.O. Smith 185237-004 manual

1 Instruction Manual PRINTED 1208 315465-000 KEEP THIS MANUAL IN THE POCKET ON HEA TER FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED. POWER VENTED GAS MODELS WITH HOT SURF ACE IGNITION NOT FOR USE IN MANUF ACTURED (MOBILE) HOMES ALL TECHNICAL AND W ARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE[...]

2 SAFE INST ALLA TION, USE AND SERVICE Y our 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 m[...]

3 GENERAL SAFETY[...]

4 SAFE INST ALLA TION, USE AND SERVICE............................2 GENERAL SAFETY..................................................................3 T ABLE OF CONTENTS ............................................................ 4 INTRODUCTION ......................................................................4 Preparing for the New Installatio[...]

5 For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters insta lled in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated b y the Commonwealth and where the side wall exhaust vent termination is less than seven [...]

6 TYPICAL INST ALLA TION GET TO KNOW YOUR W A TER HEA TER - GAS MODELS A V ent Pipe–Exhaust B V ent T erminal C V ent Adapter-Rubber Boot D Blower Assembly E Cold W ater Inlet F Inlet W ater Shut-off V alve G Union H Inlet Dip T ube J Anode** K Hot W ater Outlet L Outlet Receptacle (1 15 V AC) M T emperature-Pressure Relief V alve FIGURE 1. N Flu[...]

7 TYPICAL INST ALLA TION FIGURE 2. MIXING V AL VE USAGE This appliance has been design certi fi ed as complying with American National Standard/CSA Standard for water heaters and is considered suitable for: W ater (Potable) Heating and Space Heating: All models are considered suitable for water (potable) heating and space heating. HOTTER W A TER C[...]

8 F ACTS TO CONSIDER ABOUT THE LOCA TION 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. Whe[...]

9 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 . Adequate clearance for servicing this appliance should be considered before installation, such as changing the anodes, etc. A minimum clearance of 5"[...]

10 Chemical vapor corrosion of the fl ue, 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 ar[...]

11 W A TER PIPING HOTTER W A TER CAN SCALD: W ater 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 o[...]

12 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. 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[...]

13 GAS PIPING Make sure the gas supplied is the same type listed on the model rating plate. The inlet gas pressure must not exceed 14 inch water column (3.5 kPa) for natural and propane gas (L.P .). The 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[...]

14 SEDIMENT TRAPS A sediment trap shall be installed as close to the inlet of the water heater as practical at the time of water heater installation. The sediment trap shall be either a tee fi tting with a capped nipple in the bottom outlet or other device recognized as an effective sediment trap. If a tee fi tting is used, it shall be installed [...]

15 VENT CONNECTIONS TO BLOWER ASSEMBL Y 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. FIGURE 15. VENTING AND INST ALLA TION Plan the layout of the vent system from th[...]

16 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: • For Schedule 40, 2" PVC, ABS, Coex Cellular Core vent pipe: Every 3 feet (0.9 m). • For Schedule 40, 3" PVC, ABS, Coex Cellular Core vent pipe: Every 3.5 fee[...]

17 For 4" V enting, the maximum equivalent feet of pipe allowed is 160 feet (48.8 m). This does not include the V ent T ermination (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[...]

18 FIGURE 16. This unit can vent through 2", 3" or 4" nonmetallic pipe and fi ttings. 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 INST ALLA TION, pages 15 - 17. FIGURE 17. The [...]

19 VENT PIPE PREP ARA TION 1. INITIAL PREP ARA TION A. Make sure the solvent cement you are planning to use is designed for the speci fi c application you are attempting. B. Know the physical and chemical characteristics and limitations of the PVC and CPVC piping materials that you are about to use. C . Know the reputation of your manufacturer and[...]

20 B. Deburring Use a knife, plastic pipe deburring tool, or fi le 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 fi tting. F[...]

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22 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. It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water te[...]

23 FOR YOUR INFORMA TION ST ART UP CONDITIONS CONDENSA TE Whenever the water heater is fi lled 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. This usually happens when: a. A new water heater is fi lled with cold water for the fi rst time. b. Burning[...]

24 VENTING SYSTEM INSPECTION At least once a year a visual inspection should be made of the venting system. Y ou should look for: 1. Obstructions which could cause improper venting. The combustion and ventilation air fl ow must not be obstructed. 2. Damage or deterioration which could cause improper venting or leakage of combustion products. Be su[...]

25 INST ALLED IN SUIT ABLE AREA: T o insure suf fi cient ventilation and combustion air supply , proper clearances from the water heater must be maintained. See “Locating the New W ater Heater” section. Combustible materials such as clothing, cleaning materials, or fl ammable liquids, etc. must not be placed against or adjacent to the water h[...]

26 LEAKAGE CHECKPOINTS Read this manual fi rst. Then before checking the water heater make sure the gas supply has been turned “OFF”, and never turn the gas “ON” before the tank is completely full of water . Never use this water heater unless it is completely fi lled with water . T o prevent damage to the tank, the tank must be fi lled w[...]

27 Key No. Part Description 1 Burner Assembly 2 Burner Head 3 Burner Ori fi ce 4 Burner T ube 5 HSI Ignition Assembly 6 Inner Door 7 Inner Door Gasket 8 Flue Baf fl e 9 Flue Restrictor 10 Blower Assembly 1 1 Air Intake Screen - Base Pan 12 Inlet T ube 13 Gas Control V alve 14 Drain V alve 15 Drain V alve Washer 16 Outer Door (may appear different[...]

28 TROUBLESHOOTING GUIDELINES TROUBLESHOOTING GUIDELINES TROUBLE SHOOTING Please check guidelines below . For your safety , water heater service should be performed only by a quali fi ed service technician. Read the GENERAL SAFETY INFORMA TION section fi rst.[...]

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30 These guidelines should be utilized by a quali fi ed service agent. When calling for service notify the service agent that this is a “Flammable V apor Ignition Resistant” Product. TROUBLESHOOTING GUIDELINES TROUBLESHOOTING GUIDELINES Figure 1 and 15. Page 9.[...]

31 THIS W ARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONL Y . If the glass lined tank in this water heater shall prove upon examination by (the warrantor) to have leaked during the warranty period in normal residential use, due to natural corrosion from potable water therein, the warrantor will furnish the ORIGINAL OWNER a replacement water heater [...]

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