A.O. Smith 100 Series Installation And Operating Manual
Residential condensing gas water heaters
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- Instruction manual (120 pages) ,
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LOW LEAD
CONTENT
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do
not use any phone in your building.
•
Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
•
If you cannot reach your gas supplier,
call the fire department.
Installation
and
performed by a
service agency or the gas supplier.
PRINTED 1221
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
PRINTED 1221
service
must
be
qualified
installer,
Installation and Operating Manual
RESIDENTIAL CONDENSING GAS WATER HEATERS
POWER VENT / POWER DIRECT VENT GAS
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
• For Your Safety •
AN ODOURANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
WITH HOT SURFACE IGNITION
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
100352469_2000545260D
MODELS
SERIES 100
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Table of Contents
Related Manuals for A.O. Smith 100 Series
Summary of Contents for A.O. Smith 100 Series
- Page 1 Installation and Operating Manual RESIDENTIAL CONDENSING GAS WATER HEATERS POWER VENT / POWER DIRECT VENT GAS MODELS WITH HOT SURFACE IGNITION NOT FOR USE IN MANUFACTURED (MOBILE) HOMES SERIES 100 LOW LEAD CONTENT WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.
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Page 2: Table Of Contents
CONTENTS CONTENTS SAFE INSTALLATION, USE, AND SERVICE ....3 Power Fluctuations and Electrical Noise ......34 Important Definitions ............3 Electrical Wiring ...............34 Gas Supply Systems ............34 APPROVALS ................3 Gas Supply Regulator .............35 GENERAL SAFETY INFORMATION ........4 Gas Line Installation ............35 Precautions ...............4 Gas Line Leak Testing .............37 Grounding Instructions ............4 Gas Line Purging .............37... -
Page 3: Safe Installation, Use, And Service
SAFE INSTALLATION, USE, AND SERVICE 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. -
Page 4: General Safety Information
GENERAL SAFETY INFORMATION GENERAL SAFETY INFORMATION PRECAUTIONS DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN EXPOSED TO FLOODING OR WATER DAMAGE. Immediately call a Explosion Hazard qualified service agency to inspect the water heater and to make a determination on what steps should be taken next. - Page 5 Water temperature over 125°F (52°C) can cause severe burns instantly resulting in severe injury or death. Fire Hazard Children, the elderly and the physically or mentally disabled are at highest risk For continued protection against for scald injury. risk of fire: Feel water before bathing or showering.
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Page 6: Introduction
INTRODUCTION INTRODUCTION Thank You for purchasing this water heater. Properly installed and diagrams will serve to provide the installer with a reference. It maintained, it should give you years of trouble free service. is essential that all venting, water piping, gas piping and wiring be installed as shown. -
Page 7: Model Characteristics
MODEL CHARACTERISTICS MODEL CHARACTERISTICS Table 1. Gas Pressure and Electrical Characteristics Minimum Maximum *Manifold Pressure Supply Pressure Supply Pressure Electrical Characteristics Gas Type In. W.C. (kPA) In. W.C.(kPA) In W.C.(kPA) Volts/Hz Amperes Natural 0” (0) 3.5(1.10) 14(3.49) 120/60 <10 * The manifold pressure is the factory setting and is not adjustable. A negative pressure will be seen with just the blower running without the Gas Control Valve open. -
Page 8: Features And Components
FEATURES AND COMPONENTS FEATURES AND COMPONENTS Termination Elbow With Vent Screen 16. *Metal Drain Pan 30. Temperature Sensor *Vent Pipe 17. *Ground Joint Union (Gas Connection) 31. Burner Insulation Shield *Vent Pipe Elbow (Long Radius) 18. *Sediment Trap 32. Burner Refractory *Inlet Water Shut-Off Valve 19. - Page 9 Figure 3. Blower and Burner Components Figure 4. Blower and Intake Air Components...
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Page 10: Controls And Switches
CONTROLS AND SWITCHES switch is a positive pressure switch that requires an increase in pressure to change the electrical contacts from normally closed to open. When this switch prevents the unit from igniting, most likely the CONTROL MODULE exhaust is blocked by some means. Check to see if the condensate This heater includes a control module with a user interface and a is allowed to flow freely from the condensate trap and for obstructions LCD display (see Figure 5). -
Page 11: Installation Considerations
INSTALLATION CONSIDERATIONS INSTALLATION CONSIDERATIONS (Gas connection) Figure 6. Rough-In Front- and Right-Side Views Table 2. Rough-In Dimensions Key in Inches (centimeters) Models 40 Gallon 45.00(114.3) 22.38(56.84) 15.75(40) 11.00(27.94) 27.75(70.49) 8.75(22.22) 22.00(55.88) 8.00(20.32) 50 Gallon 54.50(138) 24.75(62.86) 18.75(47.62) 9.75(24.76) 37.75(95.89) 8.00(20.32) 22.00(55.88) 8.00(20.32) LOCATING THE WATER HEATER... - Page 12 shown in Figure 8. Check state and local codes for requirements locations close to or across from windows and doors. See Power Direct Venting (PDV) (page 18) and Power Vent (PV) (page 25). prior to installation. WARNING Fire or Explosion Hazard •...
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Page 13: Combustion Air And Ventilation
WARNING Fire and Explosion Hazard Breathing Hazard - Carbon Monoxide Gas Read the instruction manual before installing, using, or servicing the water • Install water heater in accordance with the heater. instruction manual and B149.1. • Improper use can result in fire or •... -
Page 14: Water Heater Installation
WATER HEATER INSTALLATION WATER HEATER INSTALLATION PLANNING THE VENT SYSTEM Note: The information provided in Figure 2 (page 8) is intended as a guideline for good vent installation practices only. This water heater may be installed in either a Power Direct Vent This water heater may be vented horizontally through a wall or (PDV) or in a Power Vent (PV) configuration. -
Page 15: Vent Kit
VENT KIT Table 4. Vent Pipe Materials Pipe and Fitting A Vent Kit included with this water heater may be used for standard Material Nomenclature Applicable Standard sidewall or roof termination. It consists of: ASTM D2665 or CSA B181.2 One 45° ULC PVC elbow for installation on exhaust venting, Sch 40, 80, 120 ASTM D1785 or CSA B137.3 SDR series... -
Page 16: Vent Pipe Length And Sizing
Important: Use only solid (not foam core) piping. Plastic pipe Table 6. Elbow Type and Equivalent Lengths of Straight Pipe and fittings are available through most plumbing suppliers. Always check the marking on the pipe Equivalent Length Of Straight Pipe to make sure you are using the correct material. - Page 17 Follow the vent manufacturer’s instructions for installing the venting. Install the properly sized debris screen into the outlet elbow and secure with a small quantity of silicone sealant. Do not seal the vent piping to the wall until the venting is properly connected to the condensate trap assembly.
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Page 18: Power Direct Venting (Pdv)
POWER DIRECT VENTING (PDV) The combustion air intake and exhaust vent system and termination may be installed in one of the following type terminations: Horizontal (2 Pipe) (air intake and exhaust vent). Vertical (2 Pipe) (air intake and exhaust vent) Concentric (horizontal/side wall installation). -
Page 19: Termination Clearances Sidewall Power Vent
TERMINATION CLEARANCES SIDEWALL POWER VENT Inside corner detail 15 ft Fixed closed Operable Fixed Closed Operable Regulator vent outlet In the event no regulator is present, Legend: H and I can be = Area where terminal is not permitted = Vent terminal = Air supply inlet disregarded Figure 15. - Page 20 SIDE WALL VENT TERMINATION (STANDARD) The air intake termination and the exhaust vent termination shall extend above anticipated snow level or at least450 mm Important: When terminating the vent on a side wall, the (18”) above the roof. following specifications pertaining to terminal location must be followed.
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Page 21: Low Profile Side Wall Vent Termination
LOW PROFILE SIDE WALL VENT TERMINATION kit, follow the solvent cementing procedures outlined in the System 636 Installation Guide. The Low Profile termination is certified to be used on PDV installations To fasten the Base to the wall, use the supplied screws and only. - Page 22 CONCENTRIC VENT TERMINATION A concentric vent termination kit (see Table 11) may be used for vertical or horizontal terminations. Figure 24 illustrates the concentric vent kit for a horizontal (side wall) installation. To prevent rain water from entering the exhaust outlet, slope the vent kit at a downward pitch of 6 mm (1/4”) per 1.5 m (5’) away from the inside wall.
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Page 23: Multiple Concentric Vent Termination
MULTIPLE CONCENTRIC VENT TERMINATION Slide both the intake and exhaust pipes through the holes. Solvent cement both pipes to the base of the vent termination When two concentric vent kits are being installed, the vent hood kit, follow the solvent cementing procedures outlined in the IPEX centers shall be either less than 240 mm (9.5”) apart or more than 1.1 System 636 Installation Guide, which is available on the web m (43.5”) apart. - Page 24 Figure 29. Multiple Low Profile Vent Clearances Table 12. Low Profile Termination Kits - Dimensions IPEX Part Num- Pipe Outside Hole Spacing AOS Kit Number Description Diameter (Center to Center) 100086241 196984 2” Flush Mount Vent Kitt 2.375” 5.63” 100187887 196985 3″...
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Page 25: Calculating Equivalent Feet (Pdv)
CALCULATING EQUIVALENT FEET (PDV) Table 13. Calculating Equivalent Feet (PDV) Pressure Switch Settings (in. w.c.) 2 Pipe Equiv. Vent Length Conc. Vent Equiv. Vent Length Water Heater Vent Size Heater Input (Btu/ (Inside Model Diam.) Intake Exhaust Max. Min. Max. Min. -
Page 26: Termination Clearances Other Than Sidewall Direct Vent
TERMINATION CLEARANCES OTHER THAN SIDEWALL DIRECT VENT Inside corner detail 15 ft Fixed closed Operable Fixed Closed Operable Regulator vent outlet In the event no regulator is present, Legend: H and I can be = Area where terminal is not permitted = Vent terminal = Air supply inlet disregarded... - Page 27 150 mm (6”) Attach Sealant termination elbow. Debris Screen Vent Pipe to be (Install into Cover Plate 300 mm sloped (down) toward Elbow) (optional) (12”) heater to prevent min.* water from collecting. Ground May require a Sealant Level* condensate tee. (under plate) *Where snow cover is normal during winter, ensure outlet is installed above the anticipated...
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Page 28: Calculating Equivalent Feet (Pv)
CALCULATING EQUIVALENT FEET (PV) Table 16. Calculating Equivalent Feet (PV) Pressure Switch Settings (in. w.c.) Water Heater Heater Input Vent Size (Inside Max. Equivalent Vent Min. Equivalent Vent Model (Btu/Hr) Diam.) Intake Exhaust Length Length 40 gal. 50,000 -1.88 60 ft. (18.3 m) + termi- 7 ft. -
Page 29: Water Line Connections
DO NOT install any external condensate trap. The exhaust elbow assembly has an internal condensate trap. • Care should be taken to ensure there is no kink or twist in the condensate hose. • Condensate hose must be free and clear of debris and must not allow back flow through drain line. -
Page 30: Closed Water Systems
CAUTION Table 17. Burn Time at Various Temperatures Time for 1st Time for Permanent Burns Water Temperature Degree Burns 2nd & 3rd Degree (Most Property Damage Hazard °C (°F) (Less Severe Burns) Severe Burns) 44 (110) (normal shower temp.) • Avoid water heater damage. 47 (116) (pain threshold) •... -
Page 31: Temperature-Pressure Relief Valve
insulation does not interfere with the lever of the T&P valve. Secure discharge opening must not be blocked or reduced in size under all insulation using tape. any circumstances. Excessive length, over 30’ , or use of more than four elbows can T&P Relief Valve Insulation cause restriction and reduce the discharge capacity of the valve. -
Page 32: Space Heating And Potable Water System
storage tank temperature five degrees lower than the water Consult a Qualified Installer or Service Agency. Follow manufacturer’s heater’s temperature setting. Using the plug valve, adjust instructions for installation of valves. Before changing the factory setting on the control system, seeTemperature Regulation (page 38). the flow in the recirculating line to five gallons per minute. -
Page 33: Installation
cause the T&P valve to open. piping, fittings, solder and fluxes, pumps for circulation of water, valves, etc. HOT WATER EXPANSION TANK (OPTIONAL) TO HOUSE The water heater must not be connected to a hydronic heating COLD SUPPLY FIXTURE system that has been used previously. This heater is not CHECK VALVE (IF USED designed to be used in a space heating only application. -
Page 34: Power Fluctuations And Electrical Noise
POWER FLUCTUATIONS AND ELECTRICAL NOISE GAS SUPPLY SYSTEMS WARNING The water heater’s control system requires a source of stable clean electricity for proper operation. Connecting the water heater to a branch circuit that is subject to fluctuations in voltage level or Fire and Explosion Hazard electrical line noise such as EMI (electro-magnetic interference) or RFI (radio frequency interference) may cause erratic control system... -
Page 35: Gas Supply Regulator
GAS SUPPLY REGULATOR GAS LINE INSTALLATION The maximum allowable gas supply pressure for this water heater is WARNING 14” w.c. (3.5 kPa). Install a positive lock-up gas pressure regulator in the gas supply line if inlet gas pressure can exceed 14” w.c. Fire and Explosion Hazard (3.5 kPa) at any time. - Page 36 Install a ground union between the water heater and the manual Table 18. Supply Gas Line Sizing U. S. Units shut-off valve. This is to allow easy servicing. See Figure 47. Normal Iron Pipe Sizes (Inches) Turn the gas supply on and check for leaks. See Figure 47 . Use a Input In Thousands Btu/Hr Length in chloride-free soap and water solution (bubbles forming indicate...
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Page 37: Gas Line Leak Testing
GAS LINE LEAK TESTING Any time work is done on the gas supply system perform a leak test to avoid the possibility of fire or explosion. For test pressures exceeding 1/2 psi disconnect, the water heater and its Main Gas Shutoff Valve from the gas supply piping system during testing. -
Page 38: Temperature Regulation
TEMPERATURE REGULATION TEMPERATURE REGULATION This water heater is equipped with a control system. See Control Install Thermostatic Mixing Valves to regulate the temperature of System Operation (page 40). Hot water temperatures required the water supplied to each point-of-use (for example, kitchen sink, bathroom sink, bath, shower). - Page 39 Note: When there will be no domestic hot water demand for an extended period of time, the temperature set point should be set at 90°F to prevent “Stacking” and T&P discharge. HIGH TEMPERATURE APPLICATIONS Higher operating temperatures cause more wear on all water heaters and will decrease the life span of the water heater.
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Page 40: Control System Operation
CONTROL SYSTEM OPERATION CONTROL SYSTEM OPERATION ON/OFF ON/OFF LOCK FLAME ON CELSIUS PLUS Temperature setpoint cannot be changed and the operating mode cannot be changed. TEMPERATURE SETPOINT To adjust the temperature setpoint, unlock the control and press the buttons until reaching the desired value. The new value will flash on the LCD display twice per second. -
Page 41: Installation Checklist
INSTALLATION CHECKLIST Note: Use and complete this checklist before lighting the heater. (1/8”) rise per 1.5 m (5’) away from the water heater. Correct any conditions that do not meet these instructions. ‰ Not obstructed in any way. WATER HEATER LOCATION ‰... -
Page 42: Start Up
START UP START UP START UP CONDITIONS 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. CAUTION Water must flow from the hot water faucet before turning ON gas to the water heater. - Page 43 120°F (49°C) MORE THAN 5 MINUTES 120°F (49°C) PLUS DE 5 MINUTES Install Thermostatic Mixing Valves (temperature limiting valves) at Installer des mélangeurs thermostatiques (limiteurs de température) each point-of-use to reduce the risk of scalding. à chaque point d’utilisation pour réduire le risque d’échaudage. FOR YOUR SAFETY POUR VOTRE SÉCURITÉ, READ BEFORE LIGHTING...
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Page 44: Periodic Maintenance
PERIODIC MAINTENANCE PERIODIC MAINTENANCE can propellants, cleaning solvents, refrigerator and air conditioner Table 21. Maintenance Schedule refrigerants, swimming pool chemicals, calcium and sodium chloride, Component Operation Interval Reference Every 6 waxes, bleach and process chemicals are typical compounds which See Draining and Flushing. Tank Drain and Flush Months... -
Page 45: Sediment Removal
Open the water heater drain valve to flush the storage tank. UN-LIME ® Professional Delimer is an easy to handle patented food grade acid formulated specifically for lime scale removal from Flush the water heater storage tank to remove sediment and all types of water using equipment. -
Page 46: Housekeeping
HOUSEKEEPING Turn “OFF” the electrical supply to the water heater. Turn “OFF” the gas supply at the Main Gas shut-off Valve. DANGER CLOSE the cold-water inlet valve to the water heater. OPEN a nearby hot-water faucet and leave open to allow for Fire and Explosion Hazard draining. -
Page 47: Service
WARNING Explosion Hazard • Temperature-pressure relief valve must comply with ANSI Z21.22-CSA4.4 and ASME code. • Properly sized temperature-pressure relief valve must be installed in opening provided. • Do not plug, block, or cap the discharge line. • Failure to follow this warning can Figure 45. -
Page 48: Troubleshooting
TROUBLESHOOTING TROUBLESHOOTING SERVICE MODE Example: To enter in the service mode, unlock the buttons by simultaneously H06-5.00 is the service code for “H06 Blower RPM target,” and pressing the “Lock/Unlock” and “Minus” buttons for 3 seconds. In “5.00” is the blower speed (5.00 x 1000 = 5,000 rpm). service mode, the “service”... -
Page 49: Basic Sequence Of Operation
BASIC SEQUENCE OF OPERATION then it will be turned off. The heater will remain in standby until a new call for heat occurs. CALL FOR HEAT: WATER LEAK DETECTION AND WATER SHUT OFF KIT The control determines that a call for heat is necessary when the (OPTIONAL) water temperature drops below setpoint minus the differential temperature. -
Page 50: Error Codes
ERROR CODES Hard Faults and Soft Faults can be cleared following two steps: If the fault condition is still set, the control will attempt to clear the Soft Faults after another 15 minutes (and so on). Unlock the control (by pressing the button for 3 seconds), if the interface is locked Auto Reset faults are cleared automatically when the fault condition... -
Page 51: Error Priority
ERROR PRIORITY If multiple error conditions arise at the same time, the Control will always give priority to hard faults over soft faults, and to soft faults over warnings, in ascending “class” priority sequence. In case of multiple errors of the same “class” (for example 2 or more hard faults) at the same time, the Control uses the following priority table (higher priority first). -
Page 52: 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. -
Page 53: Diagrams
DIAGRAMS DIAGRAMS WIRING DIAGRAM Figure 48. Wiring Diagram... -
Page 54: Service Parts List
SERVICE PARTS LIST SERVICE PARTS LIST Table 26. Service Parts List Kit Number Description 100344160 K,SIT BLOWER/GAS CONTROL VALVE,NG,0480.408 100344191 K, IGNITER SIDEFIRE 100344192 K,FLAME SENSOR BENT 100344193 K,BURNER,4.5",STAINLESS STEEL,NG 100344194 K,GASKET,BURNER,1/2" THK 100344196 K,CONTROL BOARD,NG,50K 100344197 K,CONTROL BOARD,NG,65K 100344198 K,SWITCH, PRESSURE N.C, AIR INTAKE, -1.88"... -
Page 55: Notes
NOTES NOTES... - Page 56 • Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.com In Canada contact: A.O. Smith Enterprises Ltd. 599 Hill Street West Fergus, ON Canada N1M 2X1 ● Technical Support: 1-888-479-8324 ● www.hotwatercanada.ca Copyright © 2021 A. O. Smith Corporation. All rights reserved..
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Questions and answers
What size gas fitting donI need
The preferred gas fitting for the A.O. Smith 100 Series water heater is Schedule-40 steel or wrought-iron pipe. The specific size must be selected based on the total gas load and the length of the pipe run, using Table 18 or Table 19 in the manual. Pipe sizing must account for pressure drop and the number of fittings.
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Where is anod rod located in a o smith signature 100 electric
The anode rod in an A.O. Smith Signature 100 electric water heater is located at the top of the water heater and requires a 1-1/16” socket for removal.
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Does the heater beep? I hear a 4 beep sequence every several minutes from an unknown source.
No. The A.O. Smith 100 Series heater does not indicate a 4 beep sequence. The manual mentions a buzzer beeping once per second for specific warnings and faults, but no 4 beep pattern is described.
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How do you remove the cold water dip tube on a Signature 100 gas water heater
I noticed they don't have plastic **** protecters
The available protectors for the A.O. Smith 100 Series include debris vent screens, which are installed in the air intake and exhaust piping to prevent foreign objects, rodents, and small birds from entering the venting system. Additionally, optional powered anodes and optional leak detection systems are available.
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