A.O. Smith BTX 100 Instruction Manual

124 series; 125 series commercial gas water heaters

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AN ODORANT IS ADDED TO THE GAS USED

BY THIS WATER HEATER.

wIth hot surface IGnItIon

•

322293-001

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Summary of Contents for A.O. Smith BTX 100

Page 1: For Your Safety
Instruction Manual coMMercIal Gas water heaters power vent/power dIrect vent Gas Models wIth hot surface IGnItIon Models BtX 100 serIes 124/125 Ashland City, TN 37015 www.hotwater.com • • for Your safety AN ODORANT IS ADDED TO THE GAS USED Thank you for buying this energy efficient water heater.
Page 2: Table Of Contents
taBle of contents SAFE INSTALLATION, USE AND SERvICE.........3 INSTALLATION REqUIREMENTS - COMMONWEALTH OF MASSACHUSETTS ..............22 APPROvALS .................3 Commonwealth of Massachusetts .........22 GENERAL SAFETY INFORMATION ..........4 Installation of Carbon Monoxide Detectors ......22 Precautions ................4 Approved Carbon Monoxide Detectors ........22 Grounding Instructions .............4 Sinage ..................22 Hydrogen Gas Flammable ............4 Exemptions ................22...
Page 3: Safe Installation, Use And Service
safe InstallatIon, use and servIce The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. 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.
Page 4: General Safety Information
General safetY InforMatIon precautIons hYdroGen Gas flaMMaBle DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service agency to inspect the appliance and to make a determination on what steps should be taken next. Explosion Hazard If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified service agency.
Page 5 General safetY InforMatIon...
Page 6 General safetY InforMatIon Fire or Explosion Hazard Fire Hazard Do not store or use gasoline or other flammable vapors and For continued protection against liquids in the vicinity of this or any other appliance. risk of fire: Avoid all ignition sources if you smell gas. Do not install water heater on Do not expose water heater controls to excessive gas carpeted floor.
Page 7: Introduction
IntroductIon Thank You for purchasing this water heater. Properly installed and Detailed installation diagrams are also found in this manual. maintained, it should give you years of trouble free service. These diagrams will serve to provide the installer with a reference.
Page 8: Features And Components
features and coMponents Get to Know Your water heater - Gas Models control assembly display enclosure t/p relief valve Blocked Inlet switch ** n exhaust elbow assembly aa rating plate Blocked outlet switch ** o condensate tubing BB labels fan prover switch off/on switch cc drain valve Blower assembly...
Page 9: Installation Consideration
InstallatIon consIderatIon rouGh In dIMensIons fIGure 1a. taBle 1 – rough-In-dimensions Units Inches 66.75 49.25 22.00 15.75 3.00 8.00 8.00 62.00 65.00 169.5 125.09 55.88 40.00 7.62 20.32 20.32 157.48 165.1 top/side Inlet and outlet: 3/4” npt Gas Inlet: 1/2” npt taBle 2 –...
Page 10: Locating The Water Heater
locatInG the water heater Carefully choose a location for the new water heater. 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. CAUTION Property Damage Hazard •...
Page 11: Insulation Blankets
installed in an alcove or closet, the entire floor must be covered by • Do not apply insulation to the top of the water heater, as this will the panel. Failure to heed this warning may result in a fire hazard. interfere with safe operation of the blower assembly.
Page 12: Confined Space
outdoor aIr throuGh two openInGs ventilation systems, clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to provide combustion, ventilation and dilution air. unusuallY tIGht constructIon In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases.
Page 13: Outdoor Air Through Two Horizontal Ducts
aIr froM other Indoor spaces 1. 1 square inch per 3000 Btu/hr (733 mm per kW) of the total input rating of all appliances located in the enclosure, and 2. Not less than the sum of the areas of all vent connectors in the space. outdoor aIr throuGh two horIZontal ducts fIGure 7.
Page 14: Chemical Vapor Corrosion
InstallInG the new water heater cheMIcal vapor corrosIon CORROSION OF THE FLUEWAYS AND vENT SYSTEM MAY OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL vAPORS. SUCH CORROSION MAY RESULT IN FAILURE AND RISk OF ASPHYXIATION. Spray can propellants, cleaning solvents, refrigerator and air This water heater shall not be connected to any heating conditioning refrigerants, swimming pool chemicals, calcium systems or component(s) used with a non-potable water heating...
Page 15: Mixing Valves
MIXInG valves dIshwashInG MachInes All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow Water temperature over 125°F (52°C) pressures between 15 and 25 pounds per square inch (103 kPa and can cause severe burns instantly 173 kPa).
Page 16: Closed Water Systems
• The hot water line from the water heater should be vertical past any mixing valve or supply line to the heating system to remove air bubbles from the system. • Do not connect the water heater to any system or components previously used with non-potable water heating appliances when used to supply potable water.
Page 17: Temperature-Pressure Relief Valve
No valve or other obstruction is to be placed between the Fit pipe insulation over the incoming cold water line and the hot Temperature-Pressure Relief Valve and the tank. Do not connect water line. Make sure that the insulation is against the top cover of discharge piping directly to the drain unless a 6”...
Page 18: Gas Piping
Gas supplY sYsteMs Gas pIpInG Make sure gas supplied is same type listed on model rating plate. The Low pressure building gas supply systems are defined as those inlet gas pressure must not exceed 14 inch water column (3.5 kPa) systems that cannot under any circumstances exceed 14”...
Page 19: Condensate Piping
54) or the Natural Gas and Propane Installation Code (CAN/CSA 12. CONDENSATE BUILD-UP WILL BLOCk THE EXHAUST B149.1) whichever applies. Copper or brass tubing and fittings OUTLET, WHICH WILL CAUSE IMPROPER OPERATION. (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 fire or explosion from leaking gas.
Page 20: Filling The Water Heater
fIllInG the water heater technical support phone number listed on the back cover of this manual for more information. vent pIpe terMInatIon The first step is to determine where the vent pipe will terminate. See Figures 16, 17, and 18. The vent may terminate through a sidewall as shown in Figures 16 and 17 or through the roof as shown in Figures 18 and 19.
Page 21: Installation Of Vent System
u.s. InstallatIons: other fittings and straight runs of vent pipe. Check system for signs of sagging or other stresses in joints as a result of misalignment note: This unit can be vented with PVC pipe materials of any components in the system. If any of these conditions are (DWV ASTM-D2665 or CSA B181.2;...
Page 22: Installation Requirements - Commonwealth Of Massachusetts
InstallatIon requIreMents - coMMonwealth of Massachusetts coMMonwealth of Massachusetts observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a) 1 through 4. For all side wall terminated, horizontally vented power vent, direct eXeMptIons vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the The following equipment is exempt from 248 CMR 5.08(2)(a)1...
Page 23: Termination Clearances Sidewall Power Vent
terMInatIon clearances sIdewall power vent POWER VENT (using room air for combustion) EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION F IX E D C L O S E D O P E R A B L F IX E D C L O S E D O P E R A B L VENT TERMINAL AIR SUPPLY INLET...
Page 24: Termination Clearances Sidewall Direct Vent
terMInatIon clearances sIdewall dIrect vent DIRECT VENT (using outdoor air for combustion) EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION F IX E D C L O S E D O P E R A B L F IX E D C L O S E D O P E R A B L VENT TERMINAL AIR SUPPLY INLET...
Page 25: Installation Sequence
InstallatIon sequence sequence of InstallatIons, fIGures 15 – 16B Cut a length of PVC pipe about 3.5 inches (8.9 cm) longer than the vent terMInals supplIed wIth heater Must Be used. wall thickness at the opening. Glue the vent terminal to this section of pipe.
Page 26: Vertical Vent Terminal Installation
vertIcal vent terMInal InstallatIon when terMInatInG throuGh a roof, the followInG specIfIcatIons pertaInInG to terMInal locatIon Must Be followed. 1. Proper support must be provided for all pipe protruding through the roof. 2. The vertical roof terminations should be sealed with a plumbing roof boot or equivalent flashing.
Page 27: Concentric Vent Installation
concentrIc vent InstallatIon 1. Determine best location for termination kit. This appliance is certified for concentric venting with concentric vent note: roof termination is preferred since it is less kit #9003910105 and #9006328005. Follow instructions below for susceptible to damage, has reduced chances to intake proper installations.
Page 28 5. Secure assembly to roof structure as shown in Figure 24 using field supplied metal strapping or equivalent support material. note: ensure termination height is above the roof surface or anticipated snow level as shown in figure 24. 6. Inst all rain c ap and small diameter pipe assembly in r o o f p e n e t r a t i o n a s s e m b l y, E n s u r e s m a l l d i a m e t e r pipe is cemented and bottomed in Y concentric fitting.
Page 29: Multi-Concentric Vent Terminations
MultI-concentrIc vent terMInatIons 5. Install rain cap and small diameter pipe assembly in Y concentric fitting and large pipe assembly. Ensure small diameter pipe is bottomed and cemented in Y concentric fitting. When two or more appliances are direct vented with concentric vent terminations near each other, each appliance must be 6.
Page 30: Direct Vent Diagram
dIrect vent dIaGraM 12” MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL 12” MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL fIGure 29. fIGure 30. 24” MINIMUM SEPARATION. EXHAUST MUST BE AT SAME LEVEL OR ABOVE INTAKE TERMINAL. fIGure 31. fIGure 32. When direct venting through the wall, as shown in Figure 33, the exhaust should terminate a minimum of 24”...
Page 31: Vent Pipe Preparation
vent pIpe preparatIon prIMer 1. InItIal preparatIon. It is recommended that Tetrahydrofuran (THF) be used to prepare the surfaces of pipe and fittings for solvent welding. Do not use water, A.) Make sure the solvent cement you are planning to use is rags, gasoline or any other substitutes for cleaning PVC or CPVC designed for the specific application you are attempting.
Page 32 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°...
Page 33: Controls And Switches
controls and swItches pressure to change the electrical contacts from normally closed to open. When this switch prevents the unit from igniting, most likely the exhaust is blocked by some means. Check to see if the condensate This model is provided with three pressure switches. These switches is allowed to flow freely from the exhaust elbow and for obstructions are essential to the safe and proper operation of the unit.
Page 34 cautIon LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERvICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION. vERIFY PROPER OPERATION AFTER SERvICING. THIS WATER HEATER IS POLARITY SENSITvE. B EFO R E A PPLYI N G ELECTRICITY TO THIS HEATER BE CERTAIN THAT SUPPLY NEUTRAL WIRE TO GROUND...
Page 35: Operating Instructions
for Your safetY read Before lIGhtInG 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.
Page 36: Temperature Regulation
teMperature reGulatIon It is recommended that lower water temperatures be used to avoid Valves for reducing the point-of-use temperature by mixing cold and the risk of scalding. It is further recommended, in all cases, that the hot water are available, see Figure 8. Also available are inexpensive water temperatures be set for the lowest temperature which satisfies devices that attach to faucets to limit hot water temperatures.
Page 37: Control System Operation
control sYsteM operatIon overvIew user Input Buttons • The up and down buttons are used to navigate menus and adjust The water heaters covered in this manual are equipped with an user settings. electronic control system that regulates water temperature inside the storage tank.
Page 38: Status Icons
status Icons The Status Icons are displayed on the Desktop screen and convey operational and diagnostic information. The icons are described in the table below. taBle 9 Icon description Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the Temperature Probe.
Page 39: Operating States
operatInG states The current operational state of the water heater is displayed on the Desktop screen as the "Status." The common operational states are described in the table below. taBle 10 state description Standby The water heater is not in an active heating cycle. IE: the Tank Temperature is at or above the Operating Set Point. Input Verification The control system is conducting a diagnostic check at the beginning of a heating cycle.
Page 40: User Settings & Control System Menus
user settInGs & control sYsteM Menus teMperatures operatInG set poInt and dIfferentIal adjustMent The Operating Set Point is adjustable from 90°F (42°C) to 180°F (82°C) for commercial and 160°F (71°C) on residential models. The factory setting is 120°F (49°C). The Differential is adjustable from 2° to 20°. The factory setting is 8°. These user settings are accessed from the Temperatures menu.
Page 41: Heater Status
teMperatures (cont) descrIptIon/actIon dIsplaY • tank temperature - non adjustable - control system sensed temperature from the Temperature Probe. Temperatures • tank probe offset - adjustable user setting, range -5° to +5° Operating Set Point 140°F (factory setting 0°). Differential 8°F The Tank Probe Offset is used to calibrate control system Tank Temperature...
Page 42: Display Settings
dIsplaY settInGs descrIptIon/actIon dIsplaY Select Display Settings from the Main Menu and press the Display Settings Operational Button under "SELECT" to enter this menu. This menu contains adjustable display options for viewing information on the Temperature Units °F LCD screen. Use the Up & Down Buttons to navigate the menu. Backlight Delay •...
Page 43: Current Fault
current fault descrIptIon/actIon dIsplaY Select Current Fault from the Main Menu and press the Operational Button under "SELECT" to enter this menu. This menu contains non Blocked Exhaust adjustable operational information. Use the Up & Down Buttons to Fault occurred 2 mins ago navigate the menu.
Page 44: Service Contact Information
servIce contact InforMatIon The control system has a discrete menu that Installing contractors and/or service agents can access to enter contact information for their customers. This contact information will be displayed with all Fault and Alert messages. descrIptIon/actIon dIsplaY From the Desktop Screen press and hold down the middle Service Contact Information (unmarked) Operational Button for 30 seconds and then release it.
Page 45: For Your Information
for Your InforMatIon start up condItIons common complaint associated with the anode rod is one of a “rotten egg smell” in the hot water. The smell is a result of four factors which must all be present for the odor to develop: sMoKe/odor It is not uncommon to experience a small amount of smoke and odor a.
Page 46: Periodic Maintenance
perIodIc MaIntenance ventInG sYsteM InspectIon conductivity and should be checked and/or replaced more often than an anode rod that appears to be intact. Replacement of a depleted anode rod can extend the life of your water heater. Inspection should be conducted by a qualified technician, and at a minimum should be checked annually after the warranty period.
Page 47: Service
2. Ensure the cold water inlet valve is open. Burn harzard. 3. Open a nearby hot water faucet and let the water run until the water is no longer hot. Then close the hot water faucet. Hot water discharge. 4. Connect a hose to the drain valve and terminate it to an adequate drain.
Page 48: Maintenance
MaIntenance teMperature-pressure relIef valve test If the Temperature-Pressure Relief Valve on the water heater weeps or discharges periodically, this may be due to thermal expansion. Burn hazard. note: Excessive water pressure is the most common cause of Temperature-Pressure Relief Valve leakage. Hot water discharge.
Page 49: Leakage Checkpoints
leaKaGe checKpoInts Never use this water heater unless it is completely filled with 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. A *Condensation may be seen on pipes in humid weather or pipe connections may be leaking.
Page 50: Troubleshooting
trouBleshootInG InstallatIon checKlIst Flow Chart. 1. When the control system is first powered, during boot up, it The list below represents some of the most critical installation will display water heater model information during initialization. requirements that, when overlooked, often result in operational After a few moments the control system LCD which is part of problems, down time and needless parts replacement.
Page 51: Sequence Of Operation Flow Chart
sequence of operatIon flow chart If tank temperature drops below Operating Set Point minus Differential setting a heating cycle is activated Control System performs diagnostic checks Normal State of all pressure switches and ECO are checked Control System Locks Out Blower Prover pressure switch verified open Displays Fault Msg All other pressure switches and ECO are verified closed...
Page 52: Operational Problems
operatIonal proBleMs If the Main Burner ignites momentarily but does not sustain ignition allow the water heater to try to ignite up to two more times until control system locks out and the Ignition Failure Fault message is displayed on the control system's LCD. If the water heater is experiencing rough starts - see Rough Starting, Rough Operation on this page.
Page 53: Resetting Control System Lock Outs
mark. The water heater will continue to operate during an Alert note: If you are not qualified and licensed or certified as required condition but the water heater must be serviced by a qualified by the authority having jurisdiction to perform a given task do not service agent as soon as possible.
Page 54: Fault And Alert Messages
fault and alert MessaGes Call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in your area. possIBle causes - checK/repaIr dIsplaYed fault/alert MessaGe • The water heater’s control system is polarity sensitive and will lock AC Reversed out and disable heating operation if the polarity of the power supply is reversed.
Page 55: Blower Prover Open
fault and alert MessaGes (cont) Call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in your area. possIBle causes - checK/repaIr dIsplaYed fault/alert MessaGe • The control system has detected the Blower Prover Switch Blower Prover Failure contacts are closed when they should be open at the beginning of a heating cycle.
Page 56: Notes
notes...
Page 57 notes...
Page 58 notes...
Page 59: Limited Warranty
lIMIted warrantY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 1. THE TANk If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first THREE years after initial installation, the warrantor will supply a replacement tank less burner and controls or a complete new A.

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Summary of Contents for A.O. Smith BTX 100

Table of Contents