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MODELS BTN 120 THRU 400/A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
•
INSTALLATION
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
Printed in U.S.A. 0603
•
OPERATION
•
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
MAINTENANCE
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
A DIVISION OF A. O. SMITH CORPORATION
McBEE, SOUTH CAROLINA, USA
1
Series 108
•
LIMITED WARRANTY
CAUTION
www.hotwater.com
PART NO. 195714-000
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Related Manuals for A.O. Smith BTN 120 THRU 400/A Series
Summary of Contents for A.O. Smith BTN 120 THRU 400/A Series
- Page 1 MODELS BTN 120 THRU 400/A COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER • INSTALLATION • Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. Printed in U.S.A. 0603 OPERATION • MAINTENANCE TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY.
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Page 2: Rough-In-Dimensions
ROUGH-IN-DIMENSIONS FRONT VIEW TABLE 1. ROUGH-IN-DIMENSIONS Model BTN-120 BTN-154 BTN-180 Dim. Inches mm Inches mm Inches 1800 1727 4 1/4 4 1/2 4 1/2 59 1/2 1511 1575 50 7/8 1292 53 5/8 1362 61 5/8 19 11/16 500 20 1/2 521 20 1/2 1/2NPT 1/2NPT... -
Page 3: Table Of Contents
TABLE OF CONTENTS ROUGH-IN-DIMENSIONS -------------------------------- 2 FOREWORD ------------------------------------------------- 3 GENERAL SAFETY INFORMATION -------------------- 4 Precautions --------------------------------------------------- 4 Grounding Instructions ------------------------------------ 4 Chemical Vapor Corrosion ------------------------------- 4 Improper Combustion ------------------------------------- 4 Extended non-use Periods ------------------------------- 4 Insulation Blankets ----------------------------------------- 4 High Altitude Installation ---------------------------------- 5 FEATURES ---------------------------------------------------- 5 High Limit Switch ------------------------------------------- 5 Electronic Ignition Control -------------------------------- 5... -
Page 4: General Safety Information
• Do inspect the insulation blanket frequently to make sure it does not sag, thereby obstructing combustion air flow. • Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels. THERE SHOULD BE NO... -
Page 5: High Altitude Installation
Correct orifice sizing and parts may be obtained from A.O. Smith Water Products Company. When ordering, be sure to state the model number and the altitude of the location where the water heater is being installed. -
Page 6: Circulating Pump
The exhaust inducer is equipped with a gravity controlled damper to reduce the amount of heat loss through the flue, improving efficiency. EXHAUST INDUCER FIGURE 4 CIRCULATING PUMP A circulating pump is used when a system requires a circulating loop or there is a storage tank used in conjunction with the heater. -
Page 7: Levelling
length and width at least 2" greater than the diameter of the heater and must be piped to an adequate drain. The pan must not restrict combustion air flow. LEVELING If the unit is not level, insert the bolts which were used in crating into the legs to correct this condition. -
Page 8: Venting
BURNERS AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION. Where an exhaust fan is supplied in the same room with a heater, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. -
Page 9: Technical Data Venting
TABLE 6. TECHNICAL DATA VENTING TYPE B GAS VENT Multiple Gas Fired Tank-Type Heaters When venting multiple tank type heaters using Type B vent pipe, follow the installation diagram (figure 4) and tables below which give sizing and data based upon NFPA 54/ANSI Z223. -
Page 10: Technical Data Venting
TABLE 6. TECHNICAL DATA VENTING (Continued) MODEL BTN-250 Input: 250,000 Btu/hr Vent Connector Size: 6 inches Input Btuh/hr Number Combined Input BTN 250 of Heaters in Thousands of Btu/hr 1,000,000 MODEL BTN-275 Input: 275,000 Btu/hr Vent Connector Size: 6 inches Input Btu/hr Number of Combined Input... -
Page 11: Water Line Connections
WATER LINE CONNECTIONS This manual provides detailed installation diagrams (see pages 13-19 of this manual) for typical methods of application for the water heater(s). The water heater may be installed by itself, or with a separate storage tank, on both single and two-temperature systems. When used with a separate storage tank, the circulation may be either by gravity or by means of a circulating pump. -
Page 12: Installation Diagrams-Top Inlet/Outlet Usage
INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE GENERAL The type, size and location of the relief valves must be in accordance with local codes. The locations of the relief valves shown in the installation diagrams are typical. The heater has a factory installed high temperature limit switch and temperature and pressure relief valve. -
Page 13: Installation Diagrams
VERTICAL STORAGE TANK AND FORCED CIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 25. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI- SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. HORIZONTAL STORAGE TANK AND FORCED CIRCULATION... - Page 14 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOP NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATER CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING MACHINE. TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERATION AND OPEN (OFF) WHEN DISHWASHER IS NOT OPERATING OR WHEN ON LONG STANDBY.
- Page 15 TO PRE-HEATER INLET. FROM BOOSTED TEMPERATURE LOOP, IF USED CONNECT TO BOOSTER INLET. † AVAILABLE FROM A.O. SMITH. PIPE RELIEF VALVE TO OPEN DRAIN. INSTALL IN ACCORDANCE WITH LOCAL CODES. The discharge opening of the temperature and pressure relief valve must be piped to an open drain and should not be subject to freezing conditions.
- Page 16 ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATION HEATER WITH OR WITHOUT MIXING VALVE HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOP NOTE 1: * PIPE RELIEF VALVE TO OPEN DRAIN. INSTALL IN ACCORDANCE WITH LOCAL CODES.
- Page 17 TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTER HEATER WITH OR WITHOUT BUILING RECIRCULATION TWO PRE-HEATERS WITH MIXING VALVE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 25. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER...
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Page 18: Vertical Storage Tank
MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION * PIPE RELIEF VALVE TO OPEN DRAIN. **WHEN USING AN A.O. SMITH T-140, -200, -350 OR -400 STORAGE TANK, USE LOWER 3/4” OPENING FOR TANK TEMPERATURE CONTROL. -
Page 19: Manifold Kits
MANIFOLD KITS TWO UNIT MANIFOLD KIT (PART NO. 78692) THREE UNIT MANIFOLD KIT (PART NO. 78593) MODEL BTN-120 BTN-154 BTN-180 BTN-199 BTN-200/A BTN-250/A BTN-275/A BTN-310/A BTN-366/A BTN-400/A FOUR UNIT MANIFOLD KIT (PART NO. 78694) DIMENSION “A” 63” 68” 72” 72” 72”... -
Page 20: Heater Wiring
HEATER WIRING All electrical work must be installed in accordance with the latest version of the National Electrical Code ANSI/NFPA No. 70, must conform to all local code authority having jurisdiction. ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION. If any of the original wire as supplied with the appliance must be replaced, use only type 105 C thermoplastic or equivalent. -
Page 21: Gas Piping
GAS PIPING Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area. Size the main gas line in accordance with Table 3. The figures shown are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is considered normal for low pressure systems. -
Page 22: Operation
correct water column pressure allowing for a nominal pressure drop through the controls. The minimum gas supply pressure for input adjustment must not be less than 4.5" w.c. (1.12 kPa) for natural gas. Do not subject the combination gas valve to inlet gas pressures of more than 14.0"... -
Page 23: Sequence Of Operation
SEQUENCE OF OPERATION The following information will describe the Sequence of Operation for this appliance. 1. Switch power on to unit. 2. Thermostat calls for heat. 3. Ignition Control Board performs diagnostic check on system components. 4. On completion of diagnostics check, the Ignition Control Board sends signal to Exhaust Inducer. -
Page 24: Lighting And Operation
LIGHTING AND OPERATION INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY A FIRE OR EXPLOSION WARNING MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. -
Page 25: Water Temperature Control
WATER TEMPERATURE CONTROL DANGER THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/ OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON'S AGE AND TIME OF EXPOSURE. -
Page 26: Ignitor Assembly
Servicing of the ignitor assembly includes keeping the ignitor free of lint, scale or any other foreign debris. FIGURE 11, IGNITOR MAIN BURNER The main burner, fig.12, should display the following characteristics: • Cause rapid ignition and carry across entire burner. •... -
Page 27: Venting System
When the heater is operating at full capacity, or full gas input, it should consume 1 cu. ft. of gas in time indicated on Table 9. VENTING SYSTEM Examine the venting system every six months for obstructions and/or deterioration of the vent piping. Remove all soot or other obstructions from chimney which will retard free draft. -
Page 28: Recommended Procedure For Periodic Removal Of Lime Deposits From Tank Type Commercial Water Heaters
BT-80 100 models. UN•LIME with the necessary hoses and fittings to delime your heater is also available as a kit: Up-N- Down Transfer Kit. Contact your local A.O. Smith dealer, distributor or, A.O. Smith Water Products Company: Telephone: (800) 433-2545 Fax: (800) 433-2515 Website: www.hotwater.com/parts... -
Page 29: Ignition Module System
Note: If your container does not have the vent cap and vent boss, drill a 3/16" hole in the handle. When you have finished deliming you will be able to plug this drilled vent with the stainless steel screw that is supplied with the kit. 2. -
Page 30: Replacement Parts, Service Handbooks And Training Aids
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, Product Service Division, 5621 West 115th Street, Alsip, IL 60803, 1-800- 433-2545. -
Page 31: Operational Checklist
This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation by examined before using the checklist. -
Page 32: 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 complete new A.