A.O. Smith W/HOT manual

1 Instruction Manual PRINTED 1207 1 97 086-002 KEEP THIS MANUAL IN THE POCKET ON HEA TER FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED. POWER VENTED GAS MODELS W / HO T SURF ACE IGNITION ALL TECHNICAL AND W ARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE W A TER HEA TER W AS PURCHASED. IF YOU AR[...]

2 SAFE INST ALLA TION, USE AND SER VICE 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 [...]

3 GENERAL SAFETY[...]

4 GENERAL SAFETY[...]

5 Thank Y ou for purchasing this water heater. Properly inst alled and maintained, it should give you years of trouble free service. Abbreviations Found In This Instruction Manual: • CSA - Canadian S tandards Association • ANSI - American National S t andards Institute • NFP A - National Fire Protection Association • ASME - American Society[...]

6 TYPICAL INST ALLA TION * CAUTION HARNESS HAS 120 V AC. IN OPERA TION. ** See "PLANNING THE VENT SYSTEM", "CONDENSA TE" and "BLOW ER ASSEMBL Y INST ALLA TION " for more information. ***The side recirculation loop connections may not be used as the primary water inlet and outlet connections. For your convenience, plugs[...]

7 TYPICAL INST ALLA TION CONDENSA TE HOSE AND DRAIN P AN FIGURE 1 (continued). * Note: Condensate T rap Loops must be oriented in a vertical plane as shown. The traps also must be primed by filling half of the loop with water prior to operating the water heater . Carefully plan the location of the loops and straight sections of hose prior to cuttin[...]

8 ROUGH-IN-DIMENSIONS Rough-In-Dimensions T op/Side Inlet and Outlet: 3/4" NPT Gas Inlet: 1/2" NPT Capacity and Gas and Electrical Characteristics All models - Maximum Supply Pressure: 14 inches W .C. (3.48kPa) Minimum Supply Pressure Natural Gas: 5.0 inches W.C. (1.24kPa) Minimum Pressure must be maintained under both load and no load (s[...]

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

10 FACTS 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 inst allation. Wh[...]

11 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. Minimum clearances between the water heater and combustible co nst r uc t ion are 0 inch at th e sid e s and r ear, 5 . 5 " (14.0 cm) from the f r ont and 12" (30.5 cm) from the top. (S tandard clearance.) If[...]

12 a free area of one square inch per 1000 Btu/hr (22 cm 2 /kW) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 cm 2 ). If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors. When directly communicating with the outdoors or [...]

13 W ater 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 internal by-pass, and no other mea[...]

14 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 water heater connections. Do not solder the water lines directly to the water heater connections. It will [...]

15 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 firing at rated input. All gas piping must comply with local codes a[...]

16 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 fitting with a capped nipple in the bottom outlet or other device recognized as an effective sediment trap. If a tee fitting is used, it shall be installed in c[...]

17 VENT PIPE TERMINA TION The first step is to determine where the vent pipe will terminate. See Figures 15, 20 and 21. The vent may terminate through a sidewall as shown in Figure 20 or through the roof as shown in Figure 21. The vent system must terminate so that proper clearances are maintained as cited in local codes or the current edition of t[...]

18 PLANNING THE VENT SYSTEM Plan the route of the vent system from the discharge of the blower to the planned location of the vent terminal. 1. La yout total v e nt system to use a minimum of v ent pipe a nd el bows. 2 . This water heater is capable of venting flue gases equivalent to 25' (7.6 m) of 2" pipe, 65' (19.8 m) of 3" p[...]

19 The condensate trap may be primed by filling the CONDENSA TE U- ASSEMBL Y with tap water using the supplied hose while the water heater is not operating. The system is fully primed when the hose is lowered below the hose clamp on the side of the water heater and water begins to flow out of the hose. In most installations the water heater will se[...]

20 CAUTION LABEL ALL WIRES PRIOR T O DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERA TION. VERIFY PROPER OPERA TION AFTER SERVICING . POWER VENT WIRING SCHEMA TIC - FIGURE 19. 2. If the Vent T erminal is being installed on the outside of a finished wall, it may be easier to mark both the inside and outsid[...]

21 INST ALLA TION OF VENT SYSTEM, SIDEW ALL With the route of the venting system and selection of materials completed, as discussed in the section of this manual titled PLANNING THE VENT SYSTEM, the through the wall vent terminal in place and the first section of piping, up to first elbow , installed at the blower it is time to complete the install[...]

22 VENT A TTENU A T I ON ASSEMBL Y I NS TALL A T I O N INSTR UC T I O N S The V ent Attenuation Assembly (V AA) is designed to provide a reduction in fan noise created in the blower wheel. This installation of this V AA is optional. Review directions thoroughly prior to installing the new V AA. Please cont act the manufacturer of the water heater a[...]

23 8. T ake the end of the tube at the bottom of the floor and route it to a suitable drain. This will provide an area where the condensate can drain without affecting the area around the appliance. 9. Once inst alled along with the rest of the vent configuration, make sure to operate the unit through at least one heat up cycle to ensure there is n[...]

24 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 specific 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 the[...]

25 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. Failu[...]

26 FOR YOUR SAFETY READ BEFORE OPERA TING W ARNING: 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 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.[...]

27 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 temperature be set for the lowest temperature which satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater . Short repeated heating cycles caused by[...]

28 FOR YOUR INFORMA TION ST ART UP CONDITIONS SMOKE/ODOR It is not uncommon to experience a small amount of smoke and odor during the initial start-up. This is due to burning off of oil from metal parts, and will disappear in a short while. THERMAL EXP ANSION Water supply systems may , because of such events as high line pressure, frequent cut-of f[...]

29 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 flow must not be obstructed. 2. Damage or deterioration which could cause improper venting or leakage of combustion product s . Be s[...]

30 INST ALLED IN SUIT ABLE AREA: T o insure suf ficient 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 flammable liquids, etc. must not be placed against or adjacent to the water heate[...]

31 LEAKAGE CHECKPOINTS Never use this water heater unless it is completely filled with water . T o prevent damage to the tank, the tank must be filled with water . W ater must flow from the hot water faucet before turning “ON” gas to the water heater . A *Condensation may be seen on pipes in humid weather or pipe connections may be leaking. B. [...]

32 TROUBLESHOOTING GUIDELINES TROUBLESHOOTING GUIDELINES TROUBLE SHOOTING Please check guidelines below . For your safety , water heater service should be performed only by a qualified service technicia n. Read the GENERAL SAFETY INFORMA TION section first. INTELLI-VENT TROUBLESHOOTING CHART - RESIDENTIAL CONTROL PROBLEM SOLUTION Inadequate or no e[...]

33 TROUBLESHOOTING GUIDELINES TROUBLE SHOOTING Please check guidelines below . For your safety , water heater service should be performed only by a qualified service technicia n. Read the GENERAL SAFETY INFORMA TION section first. INTELLI-VENT TROUBLESHOOTING CHAR T - RESIDENTIAL CONTROL PROBLEM SOLUTION Ignition/flame failure. 1. Gas supply is tur[...]

34 These guidelines should be utilized by a qualified service agent. TROUBLESHOOTING GUIDELINES TROUBLESHOOTING GUIDELINES[...]

35 Limited Warranty A. O. Smith Corporation, the warrantor , extends the following LIMITED W ARRANTY to the owner of this water heater . 1. THE T ANK If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corros ion from potable water therein, during the first THREE years after initi[...]

36[...]