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A.O. Smith 400A Maintenance Manual

A.o. smith installation operation service maintenance manual gas water heater bth 300a ,400a.

 
CYCLONE XHE
COMMERCIAL GAS WATER HEATER
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
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 service must be
performed by a qualified installer,
service agency or the gas supplier.
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE
READ THOROUGHLY BEFORE INSTALLING AND USING
THIS APPLIANCE.
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED IN U.S.A. 0306
®
GAS-FIRED POWER BURNER
FOR DOMESTIC HOT WATER
CAUTION
Model BTH 300A AND 400A
A DIVISION OF A.O. SMITH CORPORATION
1
Series 970
Series 970
Mc BEE, SOUTH CAROLINA
STRATFORD (ONTARIO) CANADA
w w w.hotwater.com
PART NO. 197373-000

Summary of Contents

  • Page 1

    Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY.

  • Page 2: Foreword

    GAS VALVE PIPING BTH-300 1 1/4" NPT BTH-400 1 1/4" NPT TABLE 1 RECOVERY CAPACITIES. TYPE OF INPUT MODEL BTUH Capacity 300,000 130 US Gals. BTH-300 NATURAL 492 Litres 280,000 130 US Gals. BTH-300 PROPANE 492 Litres 400,000 130 US Gals. NATURAL BTH-400 492 Litres...

  • Page 3: Table Of Contents

    ROUGH-IN DIMENSIONS ... FOREWORD ... FEATURES ... Water Temperature Control ... High Limit Switch (E.C.O.) ... Dishwashing Machine Requirement ... Circulating Pump ... INSTALLATION INSTRUCTIONS ... Required Ability ... Insulation Blankets ... Locating The Heater ... Clearances ... Hard Water ... Air Requirements ...

  • Page 4

    “AT A GLANCE” BTH 300/400 QUICK INSTALLATION TIPS Horizontal Sidewall Venting Vertical Rooftop Venting...

  • Page 5

    The temperature may be adjusted from 80°F/27°C to 180°F/82°C. The thermostat was adjusted to 120°F/49°C before the heater was shipped from the factory. 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.

  • Page 6: Circulating Pump, Installation Instructions, Required Ability, Insulation Blankets, Insulation Blankets

    • Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels. LOCATING THE HEATER...

  • Page 7: Clearances, Hard Water, Air Requirements, Mechanical Exhausting Of Room Air, Unconfined Space

    CLEARANCES These heaters are approved for installation on combustible flooring in an alcove when the minimum clearances from any combustion construction are followed as indicated in Figure 4. In all installations the minimum combustible clearances from any vent piping shall be 0". Vent piping passing through a combustible wall or ceiling must be a continuous run (no joints).

  • Page 8

    US DIRECT VENT CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. CANADIAN DIRECT VENT FIGURE 5.

  • Page 9

    US HORIZONTAL VENT CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. CANADIAN HORIZONTAL VENT FIGURE 6.

  • Page 10: Vent Pipe Termination, Direct Venting, Direct Venting, Direct Vent Terminal Installation

    Heater must be protected from freezing downdrafts during shutdown periods. WARNING NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIATION. VENT PIPE TERMINATION NOTE: Before installing venting, determine place of vent pipe termination.

  • Page 11: Installation Sequence, Installation Sequence, Vertical Vent Terminal Installation, Installation Sequence

    2. The horizontal centerline of the intake vent terminal may not be located lower than the horizontal centerline of the exhaust vent terminal (see Figure 9). FIGURE 9. INSTALLATION SEQUENCE For installations in the City of Los Angeles, California Category IV PVC Pipe such as that manufactured by Brownline Pipe Company, must be used as vent pipe material.

  • Page 12: Installation Of Vent System

    2. Drill a pilot hole approximately 1/4" (6 mm) outside of the marked circle. This pilot hole is used as a starting point for a saws-all or sabre saw blade. Cut around the marked circle staying approximately one quarter inch outside the line. (This will allow the vent pipe to easily slide through the opening).

  • Page 13: Vent Pipe Preparation, Vent Pipe Preparation, Controls And Switches, Blower Prover Switch

    VENT PIPE PREPARATION 1. INITIAL PREPARATION 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, PVC cellular core, ABS or CPVC piping materials that you are about to use.

  • Page 14: Hot Surface Igniter, Gas Piping, Connection Of Gas Pipe, Connection Of Gas Pipe

    HOT SURFACE IGNITER The Hot Surface Igniter is a device that ignites the main burner by high temperature (>1800°F or >982°C). When 120VAC is applied to the igniter, sufficient heat is generated to ignite the main burner. Although improvements have been made to strengthen the igniter, it is fragile and care must be taken when handling the igniter to prevent breakage.

  • Page 15: Purging, Gas Meter Size - City Gases Only, Gas Pressure Regulation, Gas Valves, System Connections

    OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS SHUTOFF VALVE. BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER MATERIAL ACCEPTABLE FOR THE PURPOSE OF LOCATING GAS LEAKS.

  • Page 16: Heater Wiring, Heater Wiring

    2. Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system. 3. This unit may never be connected to any existing heating system or component(s) previously used with non-potable water heating appliance. 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed.

  • Page 17: Operation, Sequence Of Operation, Self Diagnostic Controller

    FIGURE 16. OPERATION SEQUENCE OF OPERATION Typical Control/Appliance Operating Sequence When the control is powered, it should first display “0”, then the input line voltage (“120”), the calibration setting (12), then the actual water temperature in the tank. If the control determines that the actual water temperature inside the tank is below the programmed temperature setpoint less the differential, a call for heat is activated.

  • Page 18: Error Codes, Fault Conditions, No Incoming Line Voltage, No Low Voltage, Temperature Probe Fault

    ERROR CODES The following Error Codes are external to the controller. 01 Pressure Switch Fail On, should be Off 11 Pressure Switch Fail Off, should be On 02 Ignition Fail after 3 attempts 04 ECO Open 05 Temperature Probe Open 15 Temperature Out of Bounds <...

  • Page 19: E.c.o. Switch Open, Control Bad, Combustion Air Blockage

    Display Flashes “05” when button is pressed: Possible Cause 1. Temperature Probe wiring 1. Repair Wiring open 2. Defective probe 2. Replace probe Display Flashes “15” when button is pressed: Possible Cause 1. No water in tank and tank 1. The symptom does not in freezing conditions 2.

  • Page 20: Prior To Start-up, Required Ability, Operating Instructions

    PRIOR TO START UP - REQUIRED ABILITY INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED. Before attempting start-up, thoroughly study and familiarize yourself with the exact sequence of operation and all other details on the specific heater being used.

  • Page 21

    c. Remove the pressure regulator cover screw (Figure 16) and adjust the pressure by turning the adjusting screw with a small screwdriver. In this example, with heater running on natural gas, do not exceed 5.0" (1.25 kPa) Water Column. Clockwise to increase gas pressure and input rate. Counterclockwise to decrease gas pressure and input rate.

  • Page 22: Cathodic Protection, Precautions, General Information, Power Burner, High Limit, High Altitude Installations, Maintenance, General

    WARNING UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER. CATHODIC PROTECTION CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).

  • Page 23: Maintenance Schedule, Flushing, Draining, Sediment Removal, Lime Scale Removal

    MAINTENANCE SCHEDULE Following are the instructions for performing some of the recommended maintenance. Unit inspection and adjustment should be performed by a competent technician. COMPONENT OPERATION INTERVAL Tank Sediment Removal Tank Lime Scale Removal Annually Powered Anode Inspect System Annually Relief Valve Inspect Annually...

  • Page 24: Powered Anode System, Powered Anode System, Drain Valve And Access Panels, Relief Valve

    Hydrochloric base acids are not recommended for use on glass-lined tanks. A.O. Smith Form No. 4800 Rev. 8, entitled “Why, When and How”, describes tank cleaning methods and materials. UN•LIME and the booklet may be obtained through your A.O. Smith dealer or distributor.

  • Page 25: Internal Circulating Pump, Vent System

    CAUTION BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THAT A DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT THE VALVE DURING THIS CHECKING OPERATION.

  • Page 26: Water Temperature Control, Water Temperature Control, Installation Diagrams, Installation Diagrams

    ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3.

  • Page 27

    TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE FIXTURES. TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

  • Page 28: Manifold Kits

    TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER HEATER) WITH OR WITHOUT BUILDING RECIRCULATION MUST BE IDENTICAL HEATERS FOR MULTIPLE HEATER INSTALLATION SEE MANIFOLD KIT SPECIFICATIONS, PAGE 30. CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK- FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF...

  • Page 29

    TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER) WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES * PIPE RELIEF VALVE TO OPEN DRAIN ** 140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM WATER...

  • Page 30

    TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

  • Page 31

    MANIFOLD KITS Precision cut type “L” all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life.

  • Page 32: Checklist And Service Information, Trouble-shooting, Trouble-shooting

    IF YOU DO NOT HAVE THE PROPER TEST EQUIPMENT, I.E. A VOLT-OHM METER AND A MICROMETER, DO NOT ATTEMPT TO TROUBLESHOOT OR REPAIR A.O. SMITH EQUIPMENT. ALTERING THE CONTROLLER AND/OR CONTROLLER WIRING IN ANY WAY COULD RESULT IN INTERNAL DAMAGE TO THE...

  • Page 33: Replacement Parts

    Replacement parts may be ordered through A.O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact the A.O. Smith Water Products Company, 125 Southeast Parkway, Franklin, TN 37068, 1-800-433-2545. When ordering parts be sure to state the quantity, part number and description of the items including the complete model and serial number as it appears on the product.

  • Page 34: Limited Warranty

    A.O. Smith water heater of equivalent size and current model at the warrantor's option. Some government agencies are requiring energy efficient standards for water heaters. In the event regulations prohibit sale of a model of equivalent size and construction, A.O. Smith will provide a model which complies with the regulations of your area, in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required.

  • Page 35

    NOTES...

  • Page 36

    A DIVISION OF A.O. SMITH CORPORATION Mc BEE, SOUTH CAROLINA STRATFORD (ONTARIO) CANADA w w w.hotwater.com...

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