A.O. Smith 12 50GPC T 100 - Manuals

5 TABLE OF CONTENTS INTRODUCTION: Service Handbook Introduction ...........................................................................................................................3 Warnings and Cautions ............................................................................................

6 Exhaust Vent to Ouside of Building Union Union Water Shut-Off Valve Water Supply- Cold* Expansion Tank Pressurize to Equal Supply Water Pressure* (Relieve water pressure on the expansion tank before adjusting air pressure.) Temperature-Pressure Relief Valve with discharge piped to an adequate drai...

7 COMBUSTION AIR AND VENT SYSTEM REQUIREMENTS Table 1: BTUH Input Minimum Square Feet with 8’ Ceiling Typical Room with 8’ Ceiling 30,000 188 9 x 21 45,000 281 14 x 20 60,000 375 15 x 25 75,000 469 15 x 31 90,000 563 20 x 28 105,000 657 20 x 33 120,000 750 25 x 30 135,000 844 28 x 30 IMPORTANT:• The...

8 COMBUSTION AIR AND VENT SYSTEM REQUIREMENTS All Air from Inside the Building: When additional air is to be provided to the con fi ned area from additional room(s) within the building, the total volume of the room(s) must be of suf fi cient size to properly provide the necessary amount of fresh air...

9 COMBUSTION AIR AND VENT SYSTEM REQUIREMENTS Vent Connectors: 1. Type B, Double wall, U.L. Listed Vent Pipe.2. Single wall Vent Pipe. Maintain the manufacturer’s speci fi ed minimum clearance from combustible materials when using type B double wall vent pipe. Vent connectors made of type B, double ...

10 • The connector must be firmly attached and sealed to prevent it from falling out. • To aid in removing the connector, a thimble or slip joint may be used. • The connector must not extend beyond the inner edge of the chimney as it may restrict the space between it and the opposite wall of the chi...

11 KNOW THE WATER HEATER’S COMPONENT PARTS Figure 11. Electronic Control Display (Upper Control) The Electronic Control Display panel used on this water heater provides an easy-to-read, eye level display for temperature adjustment, fault code diagnostics and recall, powered anode rod operation and s...

13 KNOW THE WATER HEATER’S COMPONENT PARTS Flammable Vapor Cut Off Switch (FV Sensor) The water heater is equipped with a FV sensor, for detecting the presence of flammable vapors (e.g. spilled gasoline). When the sensor detects those vapors, the heater will shut down and not operate. If flammable v...

15 FILLING, DRAINING AND FLUSHING THE WATER HEATER TANK It is recommended that the tank be drained and flushed every 6 months to remove sediment which may build up during operation. The water heater should be drained if being shut down during freezing temperatures. To drain the tank, perform the fol...

16 LIGHTING INSTRUCTIONS Read and understand these directions thoroughly before attempting to operate the water heater. Make sure the view port is not missing or damaged. Make sure the tank is completely filled with water before operating the water heater. The gas control valve/thermostat has an “On...

17 ADJUSTING THE TEMPERATURE ON THE ELECTRONIC CONTROL DISPLAY Adjusting the Temperature Set Point - The thermostat of this water heater has been factory set at its lowest position. It is adjustable and must be reset to the desired temperature setting to reduce the risk of scald injury. The electron...

18 USING THE ELECTRONIC CONTROL DISPLAY How to select or change the temperature scale from Fahrenheit (°F) to Celsius (°C). Figure 22. 1. The temperature scale defaults to Fahrenheit (°F). 2. To change to Celsius (°C), press the two temperature adjustment buttons at the same time for more than five ...

19 USING THE ELECTRONIC CONTROL DISPLAY Reviewing Fault Codes: 1. Press the red up arrow button one time. 2. The display will show either E0 or E1. 3. If E0 is shown, there are no faults. By pressing the up arrow button again the display will exit the Field Service mode, or the control will exit aut...

20 Please check guidelines below. For your safety, water heater service should be performed only by a qualified service person. Read the GENERAL SAFETY INFORMATION supplied by the water heater manufacturer. 1. “POWER” Flashing Communication Error The system has detected a communication error between...

21 6. “P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing The air pressure switch contacts remain open longer than 11 seconds after the combustion fan is energized. 1. Clean the screen on the combustion air intake chamber. Turn the power “OFF” for 10 to 20 seconds then “ON” again to clear 2. Ensure the pres...

23 Please Note: The control continually monitorsinternal circuits and extern al sensors.Error codes noted abov e, and those forself-diagnostic faults can be found onpages 20 through 22. APPLY POWER TO APPLIANCE YES REQUEST FOR HEAT PRESENT? NO IS PRESSURE SW ITCH PROVEN OPEN WITHIN 5 SECONDS? NO COM...

24 EXTERNAL INSPECTION AND CLEANING Cleaning the Air Intake Chamber Screen: • At least twice annually the air intake chamber screen should be inspected for any dust or debris that may have accumulated on the louvers. NOTE: If the water heater is located in an area that is subjected to lint, pet hair...

25 ELECTRONIC CONTROL DISPLAY REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Removing the Electronic Control Display: 1. S...

26 POWERED ANODE ROD REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Ratchet with 1-1/16” Socket, Pliers, a...

27 Installing the Powered Anode Rod: 8. Use Teflon ® tape or an approved pipe sealant on threads of the new powered anode rod. 9. Prior to installing, it will be necessary to use pliers to bend up approximately 90° the electrical male connector on the top of the powered anode rod. The electrical con...

28 PRESSURE SWITCH REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Phillips Head Screwdriver. Removing the ...

29 TRANSFORMER REMOVAL / REPLACEMENT g COOLER HOTTER Electronic Control Display Figure 40. ON/OFF SWITCH ON OFF Figure 41. UNPLUGGED Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help f...

30 Installing the New Transformer: 10. Insert the wiring connector that goes to the gas control valve/thermostat through the wire protector on the side of the transformer box (Figure 44). 11. Attach the two (2) flag terminal connectors to the transformer by aligning and pressing down (Figure 44). 12...

31 AIR INTAKE CHAMBER BOX REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Phillips Head Screwdriver. Removi...

34 WIRING HARNESS REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Phillips Head Screwdriver. Removing the A...

37 AIR INTAKE CHAMBER FAN REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Phillips Head Screwdriver. Removi...

39 PRESSURE TUBING REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: Phillips Head Screwdriver. Removing the ...

43 FLAME SENSE/HOT SURFACE IGNITER REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: 3/4” Open-End Wrench or ...

44 BURNER REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: 3/4” Open-End Wrench or Crescent Wrench, Phillips...

45 Removing Old Burner : 11. After noting the position of the condensation drain hole on the top of the burner. Turn the inner door/ manifold/burner assembly upside. Using a phillips head screwdriver remove the 2 screws attaching the burner to the manifold pipe (saving screws for reinstallation late...

46 16. After confirming no material of any type are between door gasket and combustion chamber shield, align the screws on the inner door with the screw holes on the combustion chamber and tighten with 1/4” nut driver or 1/4” socket & ratchet (Figure 97). After tightening the inner door screws, ...

47 BURNER ORIFICE REMOVAL / REPLACEMENT g COOLER HOTTER Electronic Control Display Figure 102. ON/OFF SWITCH ON OFF Figure 103. UNPLUGGED Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get h...

50 GAS CONTROL VALVE/THERMOSTAT REMOVAL / REPLACEMENT Important: Use only factory authorized replacement parts. If you lack the necessary skills to properly perform the installation, you should not proceed, but get help from a qualified service technician. Tools required: 3/4” Open-End Wrench or Cre...

52 23. Turn on the gas supply to the unit and test the gas supply line and union connections by brushing on an approved noncorrosive leak detection solution (Figure 116). 24. Turn on the electrical and the gas supplies to the water heater. Plug in the electric connection from the transformer to the ...

53 * To check where threaded portion enters tank, insert cotton swab between jacket opening and fi tting. If cotton is wet, follow draining instructions in the “Draining the Water Heater” section and then remove fi tting. Put pipe dope or Te fl on ® tape on the threads and replace. When you are fi n...

54 Draw efficiency is the quantity of hot water available to the consumer before the outlet water temperature decreases 25 degrees F. A 40 gallon water heater will typically provide 70% (28 gallons) of this “usable” hot water (60% is the minimum). The burner or elements are allowed to operate during...