A.O. Smith 300 Series Instruction Manual
A.O. Smith 300 Series Instruction Manual

A.O. Smith 300 Series Instruction Manual

Commercial gas water heaters
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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
performed by a
service agency or the gas supplier.
Thank you for buying this energy efficient water heater.
We appreciate your confidence in our products.
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR
PRINTED 0723
and
service
must
qualified
installer,
COMMERCIAL GAS WATER HEATERS
LOW LEAD
CONTENT
be
SERVICE IS REQUIRED.
Instruction Manual
120(A)/150(A)/199(A)/250(A)
INSTALLATION - OPERATION - SERVICE
- MAINTENANCE -TROUBLESHOOTING
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.
For Your Safety
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
MODELS:
SERIES 300-301
100368181_2000566096D

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Summary of Contents for A.O. Smith 300 Series

  • Page 1 Instruction Manual COMMERCIAL GAS WATER HEATERS MODELS: 120(A)/150(A)/199(A)/250(A) SERIES 300-301 INSTALLATION - OPERATION - SERVICE - MAINTENANCE -TROUBLESHOOTING 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.
  • Page 2: Table Of Contents

    CONTENTS APPROVALS ................3 AL29-4C Vent Installations ............ 33 ® Common Direct Venting Requirements ......... 34 GENERAL SAFETY INFORMATION .......... 4 Concentric Termination Installation Preparation ....34 Do Not Use If Damaged ............4 Concentric Termination Installation ........34 Limiting the Risk of Scalding ............. 4 Low-Profile Vent Termination installation ......
  • Page 3: Approvals

    APPROVALS LOW LEAD CONTENT Note: ASME construction is optional on the water heaters covered in this manual. Commercial Gas Water Heaters • 3...
  • Page 4: General Safety Information

    GENERAL SAFETY INFORMATION DO NOT USE IF DAMAGED water heater’s gas control valve should not be used as the sole means to regulate water temperature and avoid scalds. DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN EXPOSED TO FLOODING OR WATER DAMAGE.
  • Page 5: Hazard Messages

    General Safety Information HAZARD MESSAGES CAUTION The proper installation, use, and servicing of this water heater is extremely important to your safety and the safety of others. Property Damage Hazard 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 •...
  • Page 6 General Safety Information Breathing Hazard - Carbon Monoxide Gas Explosion Hazard • Install vent system in accordance with codes. • Do not operate water heater if exposed to flooding or water damage Temperature-Pressure Relief Valve • Special consideration must be taken with installations must comply with ANSI Z21.22- above 3,078 m (10,100 ft) refer to high altitude section of this manual.
  • Page 7 General Safety Information CAUTION Burn Hazard • The combustion chamber and burner sleeve and housing become very hot during operation. • Do not reach into the burner housing or combustion chamber if the water heater is still hot. • Allow the water heater to cool and always use gloves when handling the main burner.
  • Page 8: Introduction

    INTRODUCTION Thank You for purchasing this water heater. Properly installed and To order or to find out more about iCOMM™ or ICC devices, logon to the maintained, it should give you years of trouble free service. manufacturer’s website at http://www.hotwater.com/ or call 888-928-3702 (888-WATER02) for more information.
  • Page 9 Introduction Carefully plan the placement of the water heater. Examine the location to ensure that it complies with the requirements in Locating the Water Heater (page 15) and the Rough-In Dimensions (page 14). For installation in California this water heater must be braced or anchored to avoid falling or moving during an earthquake.
  • Page 10: Features And Components

    FEATURES AND COMPONENTS BASIC OPERATION MODULATION The water heaters covered in this manual have a helical coil shaped heat The water heaters covered by this manual are capable of modulating their exchanger that is submerged in the storage tank. The water heater’s firing rate.
  • Page 11: Components- Top View (All Models)

    Features and Components COMPONENTS- TOP VIEW (ALL MODELS) 120-VAC junction box. Incoming power supply, ground connections, and other field-installed electrical connections are made here. See Power Important: The Enable/Disable switch listed in this manual is NOT an Supply (page 17) and Power Supply Connections (page 46). "On/Off"...
  • Page 12: Side Views

    Features and Components LEFT SIDE RIGHT SIDE Figure 4. Left-Side and Right-Side Components SIDE VIEWS Clean-out access panel, covers water heater clean-out opening and Temperature-Pressure Relief Valve discharge pipe. See T&P Valve ASME plate where applicable. Discharge Pipe Requirements (page 19). CCB enclosure.
  • Page 13 Features and Components Table 1. Performance Data Input U. S. Gallons/hr & liters/hr at temperature rise indicated °F 30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F Type of Thermal Model Btu/hr Efficiency% °C 17°C 22°C 28°C 33°C 39°C 44°C...
  • Page 14: Rough-In Dimensions

    INSTALLATION CONSIDERATIONS ROUGH-IN DIMENSIONS SUPPLY GAS CONNECTION INTAKE AIR CONNECTION 3 INCH PVC WATER OUTLET HEIGHT T & P VALVE FRONT BACK 3/4” NPT RECIRCULATION RETURN LOWER VENT TEMPERATURE CONNECTION PROBE 3 INCH (exhaust elbow) CLEANOUT 1 1/2” NPT WATER 3/4”...
  • Page 15: Locating The Water Heater

    Installation Considerations Table 4. Fuel Type/Connection Size by Model † MODEL SERIES NATURAL GAS PROPANE GAS 300/301 3/4 "NPT 3/4 "NPT 300/301 3/4 "NPT 3/4 "NPT 300/301 3/4 "NPT 3/4 "NPT 300/301 3/4 "NPT 3/4 "NPT † Depending on the installed equivalent length, and/or the number of appliances connected, the supply gas line size may have to be increased beyond the minimum required sizes.
  • Page 16: Optional Direct Vent Terminations

    Installation Considerations floor shall be covered by the panel. The panel must be strong enough to is provided with a 3/4" NPT recirculation loop return connection. See Water carry the weight of the heater when full of water. Piping Diagrams (page 80) for installation location of circulating pumps. Note: Adequate clearance for servicing should be maintained on all See Circulation Pump Wiring Diagrams (page 79) for electrical hookup installations.
  • Page 17: Installation Requirements

    INSTALLATION REQUIREMENTS GAS SUPPLY SYSTEMS Supply gas regulators shall have inlet and outlet connections not less than the minimum supply gas line size for the water heater they supply. Low pressure building gas supply systems are defined as those systems that See Table 14 (page 44).
  • Page 18: Thermostatic Mixing Valves

    Installation Requirements THERMOSTATIC MIXING VALVES be used in the 180°F (82°C) line to the dish-washing machine and should be adjusted to deliver water pressure between these limits. Water heated to a temperature which will satisfy clothes washing, dish washing, and other sanitizing needs can scald and cause permanent injury upon contact.
  • Page 19: Temperature-Pressure Relief Valve

    Installation Requirements TEMPERATURE-PRESSURE RELIEF VALVE if circumstances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage. Explosion Hazard Property Damage Hazard Temperature-Pressure Relief Valve ● The temperature-pressure relief-valve discharge pipe must comply with ANSI Z21.22- must terminate at an adequate drain.
  • Page 20: Condensate Drain

    Installation Requirements CONDENSATE DRAIN Note: Lower pH levels are acidic. Do not connect a metal drain line, such as copper, to the water heater for this reason. See Condensate Drain The water heaters covered in this manual are condensing appliances Installation (page 43).
  • Page 21: Air Requirements

    Installation Requirements it is imperative that the water heater(s) be installed in a Direct Vent Unusually Tight Construction configuration so that all air for combustion is derived directly from the In unconfined spaces in buildings, infiltration may be adequate to provide outdoor atmosphere through a sealed intake air pipe.
  • Page 22: Fresh Air Openings For Confined Spaces

    Installation Requirements FRESH AIR OPENINGS FOR CONFINED SPACES OUTDOOR AIR THROUGH ONE OPENING The following instructions shall be used to calculate the size, number and placement of openings providing fresh air for combustion, ventilation and dilution in confined spaces. The illustrations shown in this section of the manual are a reference for the openings that provide fresh air into confined spaces only.
  • Page 23 Installation Requirements The horizontal ducts shall communicate directly with the outdoors. See Each duct opening shall have a minimum free area of 1 square inch Figure 11. per 4,000 Btu/hr (550 mm per kW) of the aggregate input rating of all appliances installed in the enclosure.
  • Page 24: Installation Requirements - Commonwealth Of Massachusetts

    INSTALLATION REQUIREMENTS - COMMONWEALTH OF MASSACHUSETTS COMMONWEALTH OF MASSACHUSETTS INSPECTION For all side wall terminated, horizontally vented power vent, direct vent, The state or local gas inspector of the side-wall horizontally-vented and power direct vent gas fueled water heaters installed in every dwelling, gas-fueled equipment shall not approve the installation unless, upon building or structure used in whole or in part for residential purposes, inspection, the inspector observes carbon-monoxide detectors and signage...
  • Page 25: Venting Installation

    VENTING INSTALLATION Approved intake air pipe materials that must be used in Canada: PVC pipe materials: Breathing Hazard - Carbon Monoxide Gas • DWV ASTM-D2665 or CSA B181.2 • Install vent system in accordance with codes. • • Schedule 40, 80, 120 ASTM-D1785 or CSA B137.3 Do not operate water heater if exposed to flooding or water damage •...
  • Page 26 Venting Installation be installed in a Direct Vent configuration so that all air for combustion barb installed in the 1/2 inch branch to connect the Blocked Intake Air is derived from the outdoor atmosphere. switch sensing tube. See Figure 14. The vent and intake air piping must terminate outdoors.
  • Page 27: Venting Requirements

    Venting Installation Disconnect the Blocked Intake Air switch sensing tube. See Figure 3 50 feet equivalent length, the intake air pipe must be installed using (page 11) for the location. three-inch pipe and the vent must be installed using four-inch pipe. Loosen the large hose clamp on the Fernco coupling that connects the Maximum Equivalent Lengths intake air connection pipe to the Combustion blower.
  • Page 28: Common Direct Venting

    Venting Installation POWER VENT INSTALLATION Table 7. PVC/CPVC Equivalent Length and Maximum Number of Elbows Read the General Venting Instructions (page 25) and Venting Requirements Equivalent Vent Length Max Elbows (page 27) before proceeding. These instructions and requirements Model 2" 3"...
  • Page 29 Venting Installation Determine vent and intake air pipe size to be used for the installation. 13. Ensure the Intake Air Screen on the Intake Air Connection to the water See Venting Requirements (page 27). heater is removed before connecting the intake air pipe to the water heater.
  • Page 30: Vertical Termination Installation

    Venting Installation requirements shown in Figure 22 (page 31) and Figure 23 (page 31) INSTALL TEE FITTING AS CLOSE TO WATER HEATER INTAKE INTAKE AIR CONNECTION AS POSSIBLE are being maintained. These clearances and those cited by local and FACTORY PIPING national codes must be maintained.
  • Page 31 Venting Installation IF LESS THAN 10 FEET (3 m) 24 INCHES (60 cm) MINIMUM HEIGHT ABOVE INTAKE AIR AND VENT (EXHAUST) TERMINATIONS 45° ELBOW WITH RECESSED INTAKE AIR AND/OR VENT DEBRIS SCREEN TERMINATION(S) MUST BE A MINIMUM OF 24 INCES (60 cm) ABOVE ANY PARAPET, VERTICAL WALL OR STRUCTURE WITHIN 10 FEET (3 m) HORIZONTALLY.
  • Page 32: Polypropylene Installations

    Venting Installation If installing both an intake air and vent termination in a Direct Vent 11. The wall plates for the three-inch vent pipe are included with the configuration through a sidewall there must be a minimum of 24 heater. Wall plates for two-inch or four-inch vents are field-supplied. inches (61 cm) separation, measured on vertical center line, between Slide the included metal wall plate(s) over the pipe(s) to stop against the intake air and vent terminations.
  • Page 33: Al29-4C ® Vent Installations

    Venting Installation Polypropylene vent systems do not use cement to connect the pipe The adapter is supplied by the vent manufacturer to adapt to its vent and elbow sections. They use a push-together gasket-seal method. Do system. not attempt to connect Polypropylene with sealant cement. All vent In order to be in full compliance with UL 1738 or ULC-S636 and to meet the connections MUST be secured by the vent manufacturer's joint connector.
  • Page 34: Common Direct Venting Requirements

    Venting Installation ® Table 11. Duravent FasNSeal AL29-4C Vent System Parts Flue Outlet *Straight Pipe Equivalent Linear Equivalent Linear Adapter to Diameter Adapter (3’ Section) 45° Elbow Length, 45° Elbow 90° Elbow Length, 90° Elbow 3” 810005378 FSVL3603 FSELB4503 5 feet FSELB9003 10 feet 810009530...
  • Page 35: Combustion Air

    Venting Installation Return to Direct Vent Installation (page 28) to complete the installation INTAKE AIR CONNECTION INTAKE AIR PIPE of the intake air and vent piping between the concentric termination VENT PIPE Y FITTING and the water heater. VENT MAINTAIN 12” (30 cm) 18”...
  • Page 36 Venting Installation Close Proximity & Standard Clearance The clearance between multiple termination caps must be zero inches (touching) to a maximum of two inches (5 cm), dimension A - Figure 31, when installing concentric terminations in close proximity. See Figure CONCENTRIC 36 (page 37).
  • Page 37: Low-Profile Vent Termination Installation

    Venting Installation Lateral groups of four as shown in Figure 34 may be a more convenient SIDEWALL installation arrangement for multiple groups depending on available space. SIDEWALL ROOF ROOF Figure 36. Two Concentric Terminations Figure 38. Eight Concentric Terminations Four Concentric Terminations Four concentric terminations may be installed in close proximity as shown LOW-PROFILE VENT TERMINATION INSTALLATION in Figure 37.
  • Page 38 Venting Installation 12” Min between Edge of Air Inlet Air Inlet Vent (Exhaust) and Adjacent Vent (Exhaust) Outlet Piping Vent Base Air Inlet Vent Cap Vent (Exhaust) Piping Vent/Air Termination Figure 39. Inlet and Vent Flow in Low-Profile Vent Installation To Heater Intake Figure 41.
  • Page 39: Venting Arrangements

    Venting Installation VENTING ARRANGEMENTS Enlarged View of Direct Vent Air Intake Moisture Protection Figure 42. Power Vent Vertical Figure 43. Power Vent Horizontal Figure 44. Direct Vent Vertical Enlarged View of Direct Vent Air Intake Moisture Protection Enlarged View of Enlarged View of Direct Vent Air Intake Direct Vent Air Intake...
  • Page 40 Venting Installation Enlarged View of Direct Vent Air Intake Moisture Protection Enlarged View of Enlarged View of Direct Vent Air Intake Direct Vent Air Intake Moisture Protection Moisture Protection Figure 50. Direct Vent Horizontal Low-Profile Figure 48. Direct Vent Vertical Concentric Figure 49.
  • Page 41: Termination Clearances Sidewall Power Vent

    Venting Installation TERMINATION CLEARANCES SIDEWALL POWER VENT Inside corner detail 15 � Fixed closed Legend: Operable Fixed Closed = Vent terminal Operable = Air supply inlet Regulator vent outlet In the event no = Area where regulator is present, H and I can be terminal is not disregarded permitted...
  • Page 42: Termination Clearances Sidewall Direct Vent

    Venting Installation TERMINATION CLEARANCES SIDEWALL DIRECT VENT Inside corner detail 15 � Fixed closed Legend: Operable Fixed Closed = Vent terminal Operable = Air supply inlet Regulator vent outlet In the event no = Area where regulator is present, H and I can be terminal is not disregarded permitted...
  • Page 43: Water Heater Installation

    WATER HEATER INSTALLATION CONDENSATE DRAIN INSTALLATION The exhaust elbow has a built in condensate trap. Do not install an additional trap in the condensate drain piping. Do not remove, modify Installation must conform with these instructions and local building codes. or alter the factory condensate trap.
  • Page 44 Water Heater Installation Size the supply/main gas line(s) in accordance with Table 14 or Table 15. The values given in Table 14 and Table 15 are for straight lengths of iron pipe at 0.5" W. C. (125 Pa) pressure drop, which is considered normal for low Fire and Explosion Hazard pressure systems.
  • Page 45: Gas Line Leak Testing

    Water Heater Installation 24-volt gas valve in accordance with all applicable local and national code requirements. Depending on the developed equivalent length and/or the number of Fire and Explosion Hazard appliances connected to a common main, the size of the supply gas line may have to be increased.
  • Page 46 Water Heater Installation Power Supply Connections such as time clocks or Building Management Systems. The enable/disable circuit may be used to disable heating operation during periods when the Read the requirements for the Power Supply (page 17) before connecting building is unoccupied or there is no demand for hot water. power.
  • Page 47: T&P Valve Discharge Pipe

    Water Heater Installation Note: Ensure the water heater is protected from freezing temperatures When the system requires water for space heating that exceed safe when water heating operation is disabled. Damage to the water temperatures at domestic water fixtures a mixing valve must be heater caused by freezing temperatures is not covered under the installed.
  • Page 48 Water Heater Installation Water Leak Protection The water heaters covered by this manual have a water leak protection feature that senses the buildup of water in the vicinity of the appliance, setting off an alarm to alert the end user. To use this feature, contact your local distributer or call Technical Support for assistance in ordering this kit.
  • Page 49: Start Up

    START UP PRIOR TO START UP Note: All test equipment must be acclimated to ambient temperature before calibration and use. Installation and start up of this water heater requires abilities and skills Start-Up Procedure equivalent to that of a licensed tradesman in the field involved. See Qualifications (page 8).
  • Page 50: Lighting The Water Heater

    Start Up SUPPLY GAS VALVE CONNECTION LOW GAS PRESSURE SWITCH COMBUSTION AIR INLET VENTURI Figure 59. Gas Valve/Venturi Assembly Side View LIGHTING THE WATER HEATER The instruction label below is affixed to the water heaters that are covered by this manual at the factory and must be followed when lighting and operating the water heater.
  • Page 51: Checking The Firing Rate

    Start Up Supply Gas Pressure Adjustment Connect a manometer to the supply gas pressure tap. Follow the instructions for Start-Up Procedure (page 49). Supply gas pressure shall be measured while the water heater is not Start the water heater and ensure it is firing. firing (static pressure) and while the water heater is firing at full capacity (dynamic pressure).
  • Page 52 Start Up Breathing Hazard - Carbon Monoxide Gas Under no circumstances should the input exceed the rate shown on the water heater’s rating label. Overfiring could result in damage to the water heater and sooting. Gas and carbon monoxide detectors are available.
  • Page 53: Temperature Regulation

    TEMPERATURE REGULATION LIMITING THE RISK OF SCALDING THERMOSTAT CONTROL For a variety of reasons, water heaters can produce water that is much Water temperature over 125°F (52°C) can cause severe burns instantly hotter than its temperature setting. Take precautions to prevent this higher resulting in severe injury or death.
  • Page 54: Intelligent Demand Response

    Temperature Regulation probes, one installed in the top of the storage tank and one installed near the bottom. See Figure 3 (page 11) and Figure 4 (page 12) for location. The “Operating Set Point” is adjusted to regulate water temperature inside the storage tank.
  • Page 55: Control System Operation

    CONTROL SYSTEM OPERATION WI-FI The water heaters covered in this manual are equipped with an electronic control system that regulates water temperature inside the storage tank. The water heaters covered in this manual feature a wi-fi functionality that Heating cycles and ignition are managed by the control system. The ECO is enabled at the factory.
  • Page 56 Control System Operation Status Icons The Status Icons are displayed on the Home screen and convey operational and diagnostic information. The icons are described in the table below. Table 17. Status Icons 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 Upper and Lower Temperature Probes.
  • Page 57 Control System Operation Operating States The current operational state of the water heater is displayed on the Home screen as the "Status." The common operational states are described in the table below. Table 18. Operating States 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 58: User Settings & Control System Menus

    Control System Operation USER SETTINGS & CONTROL SYSTEM MENUS When the water temperature, sensed by the control system from the two (upper and lower) Temperature Probes, reaches the Operating Set Point, Temperatures Menu the control system ends the heating cycle. A heating cycle is activated again when the sensed water temperature drops below the Operating Set Point Operating Set Point and Differential Adjustment minus the Differential setting.
  • Page 59 Control System Operation Temperatures Menu Description/Action Display Use the "+" and "-" Buttons to change the current setting. Operating Setpoint ° Press "ACCEPT" to save the new setting. Press "BACK" to discard changes and return to the previously saved setting. °...
  • Page 60 Control System Operation iCOMM Menu Description/Action Display Wi-fi Status - displays status of wi-fi connection. Top of Menu Ethernet - displays status of Ethernet connection. iCOMM Wi-Fi Status Enabled iCOMM Server - displays status the iCOMM server. Ethernet Not Connected Wi-fi MAC - displays the wi-fi MAC number.
  • Page 61 Control System Operation Heater Status Menu Description/Action Display Top of Menu Press Heater Status from the Main Menu to enter this menu. This menu Heater Status contains non adjustable operational information. Use the slide bar to Status: Standby navigate the menu. ECO Contact Closed •...
  • Page 62: Blocked Exhaust

    Control System Operation Heater Information Description/Action Display Press Heater Information from the Main Menu to enter this menu. This Top of Menu menu contains non adjustable operational information. Heater Information • Elapsed Time - Total accumulated time the control system (water Elapsed Time 0days 0hrs 43mins >...
  • Page 63: Restore Defaults

    Control System Operation Fault History Description/Action Display Press "Fault History" from the Main Menu to enter this menu. This menu Fault History contains non adjustable operational information. Use the slide bar to Upper Temp Probe (Open) (47) > navigate the menu. 0 days 2 hrs 37 mins ago >...
  • Page 64 Control System Operation Service Contact Information Description/Action Display The control system has a discrete menu that Installing contractors and/or Top o Menu service agents can access to enter contact information for their customers. Contact Information This contact information will be displayed with all fault and alert messages Show Contact No >...
  • Page 65 Control System Operation Service Contact Information Description/Action Display When the new Contact Name and Contact Phone number have both been Contact Information updated, press "BACK" to return to the Home screen. Show Contact Yes > Change Contact Name > Change Contact Phone >...
  • Page 66: Maintenance

    MAINTENANCE Table 20. Maintenance Schedule Keep water heater area clear and free from combustible materials, gasoline, Component Operation Interval Reference and other flammable vapors and liquids. See Combustible Material Storage See Temperature-Pressure Relief T&P Valve Test Operation Semi Annually (page 20). Valve Test (page 68).
  • Page 67: Sediment Removal

    Maintenance Flushing the Storage Tank every 6 months at first. Deliming maintenance should then be performed based on the time it takes for 1 inch (2.5 cm) of lime to accumulate in the Turn the Enable/Disable switch located on the front of the heater to bottom of the water heater.
  • Page 68: Powered Anodes Maintenance

    Maintenance Inlet Air Connection Property Damage Hazard Location of Avoid damage. Sight Inspection and replacement of anode rod required. Glass Follow the instructions in drain the water heater in Draining and Flushing (page 66) first. Remove the powered anodes from the water heater by loosening the 3/4”...
  • Page 69: Vent System Maintenance

    Maintenance not cause any property damage, as the water may be extremely hot. Use Do not plug the Temperature-Pressure Relief Valve opening. This can care when operating valve as the valve may be hot. cause property damage, serious injury or death. To check the relief valve, lift the lever at the end of the valve several times.
  • Page 70: Troubleshooting

    TROUBLESHOOTING INSTALLATION CHECKLIST Ensure the water heater is properly grounded. Flame sensing requires an adequate earth ground. If the water heater is not properly grounded The list below represents some of the most critical installation it will cause ignition failure. requirements that, when overlooked, often result in operational problems, down time and needless parts replacement.
  • Page 71: Sequence Of Operation Flow Chart

    Troubleshooting SEQUENCE OF OPERATION FLOW CHART Sequence is shown with Enable/Disable Switch in the Enable position If tank temperature drops below Operating Set Point minus Differential setting a heating cycle is activated Control System performs diagnostic checks Control System Locks Out Normal State of all pressure switches and ECO are checked Displays Fault Msg Pressure switches and ECO are verified closed...
  • Page 72: Operational Problems

    Troubleshooting OPERATIONAL PROBLEMS • Vent (exhaust) gas recirculation at the vent and intake air pipe terminations on Direct Vent Installation. See Direct Vent Installation (page 28). • Excessive equivalent lengths of intake air and/or vent (exhaust) piping installed. See Venting Requirements (page 27). Read and understand this instruction •...
  • Page 73: Fault And Alert Conditions

    Troubleshooting Note: The water heaters covered by this manual are capable of The control system will lock out and disable heating operation until the modulating their firing rate. The firing rate is dictated by the condition is corrected. The water heater must be serviced by a qualified hot water draw and various other temperature limitations.
  • Page 74 Troubleshooting Jumping out control circuits or components can result in property damage, personal injury or death. • Service should only be performed by a qualified service technician using proper test equipment. • Altering the water heater controls and/or wiring in any way could result in permanent damage to the controls or water heater and is not covered under the limited warranty.
  • Page 75 Troubleshooting Fault and Alert Messages Possible Causes - Check/Repair Displayed Fault/Alert Message • If Blocked Intake error occurs before blower runs, make sure pressure switch Blocked Air Intake connections are clean and tight. Check pressure switch continuity/resistance. 0 days 0 hrs 0 mins ago Switch should be closed (continuity/0 ohms).
  • Page 76: Checking For Leaks

    Troubleshooting CHECKING FOR LEAKS 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 77: Diagrams

    DIAGRAMS CENTRAL CONTROL BOARD (CCB) LAYOUT Figure 69. Central Control Board Layout Commercial Gas Water Heaters • 77...
  • Page 78: Wiring Diagram

    Diagrams WIRING DIAGRAM Blower Spark 24Vureg 1 White / Brown Module Speed f-back 2 White / Orange 1 Red 120V 24Vureg 4 White / Blue 1 White/Brown 2 Black Neutral PWM Signal PWM Signal 3 Green Ground 2 White/Blue Dgnd 5 White / Green 1 Red Neutral...
  • Page 79: Circulation Pump Wiring Diagrams

    Diagrams CIRCULATION PUMP WIRING DIAGRAMS FIELD SUPPLIED TEMPERATURE CONTROL INSTALLED IN THE STORAGE TANK OR CIRCULATING LOOP RETURN LINE NOTE: USE SEPARATE 120 VAC POWER SUPPLY FOR PUMP CIRCUIT. DO NOT SHARE POWER WITH WATER HEATER AS THIS MAY CAUSE ELECTRICAL LINE NOISE AND LEAD TO ERRATIC CONTROL SYSTEM OPERATION.
  • Page 80: Water Piping Diagrams

    Diagrams WATER PIPING DIAGRAMS One Water Heater, Single Temperature with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18).
  • Page 81 Diagrams One Water Heater, Two Temperatures with High-Temperature Loop Recirculation with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18).
  • Page 82 Diagrams One Water Heater, Single Temperature with Vertical Storage Tank Forced Recirculation with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18).
  • Page 83: Storage Tank

    Diagrams One Water Heater, Single Temperature with Horizontal Storage Tank, Forced Recirculation with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18).
  • Page 84 Diagrams Two Water Heaters, Single Temperature with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18). on a building recirculation loop wire according to Figure 71 (page 79).
  • Page 85 Diagrams Three Water Heaters, Single Temperature with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18). on a building recirculation loop wire according to Figure 71 (page 79).
  • Page 86 Diagrams Four Water Heaters, Single Temperature with Building Recirculation Before installation of water piping review the following: See Water Line Connections (page 47). If a pump is being installed between a water heater and storage tank or See Thermostatic Mixing Valves (page 18). on a building recirculation loop wire according to Figure 71 (page 79).
  • Page 87 NOTES Commercial Gas Water Heaters • 87...
  • Page 88 Copyright © 2023 . All rights reserved.

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