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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 IN BLACK BOLD TYPE OR UNDERLINED 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. 1104
®
SERIES 970 AND 973
GAS-FIRED POWER BURNER
FOR DOMESTIC HOT WATER
CAUTION
Model BTH 120-250(A)
A DIVISION OF A.O. SMITH CORPORATION
1
Mc BEE, SOUTH CAROLINA
PART NO. 196145-001
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Related Manuals for A.O. Smith BTH 120-250(A)
Summary of Contents for A.O. Smith BTH 120-250(A)
- 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 IN BLACK BOLD TYPE OR UNDERLINED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY.
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Page 2: Rough-In Dimensions
CYCLONE XHE BTH 120 - 250 ROUGH-IN-DIMENSIONS GAS VALVE PIPING BTH-120 1/2" NPT BTH-150, 199 & 250 3/4" NPT Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P. Approx. Input Gallon Model BTU/Hr. Capacity BTH - 120 125,000 Nat. BTH - 120 120,000 L.P. -
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 ... 4-13 Required Ability ... Insulation Blankets ... Locating The Heater ... Clearances ... Hard Water ... Air Requirements ... -
Page 4: High Limit Switch (E.c.o.)
INSULATION BLANKETS Insulation blankets available to the general public for external use on gas water heaters are not approved for use on your A.O. Smith water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. -
Page 5: Locating The Heater
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 6: Hard Water
ALCOVE HARD WATER Where hard water conditions exist, water softening or the threshold type of water treatment is recommended. This will protect the dishwashers, coffee urns, water heaters, water piping and other equipment. See MAINTENANCE section for details of tank cleanout procedure. AIR REQUIREMENTS KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND... - Page 7 DO NOT TERMINATE EXHAUST OVER PUBLIC AREA WHERE CONDENSATE OR VAPOR CAN CAUSE NUISANCE OR HAZARD. DIRECT VENT ON DIRECT VENT INSTALLATIONS, EXHAUST VENT FIGURE 5 HOOD MUST BE LOCATED 1' (30.5cm) MINIMUM FROM ANY OPENING IN BUILDING. HORIZONTAL VENT ON DIRECT VENT INSTALLATIONS, EXHAUST VENT HOOD MUST BE LOCATED 4' (122cm) MINIMUM FROM ANY OPENING IN BUILDING.
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Page 8: Direct Venting
TRANSMITTED INTO THE LIVING SPACES. IMPORTANT The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and for Canadian installations consult the Canadian Installation Codes and CAN/CGA B149.1 and .2. -
Page 9: Installation Sequence
FIGURE 9 IMPORTANT WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BE FOLLOWED. 1. The intake vent terminal and the exhaust vent terminal must terminate on the same exterior wall and must be located at a minimum of 24" (61cm) from the vertical centerline of the exhaust vent terminal (see Figure 9). -
Page 10: Vertical Vent Terminal Installation
FIGURE 11 VERTICAL VENT TERMINAL INSTALLATION IMPORTANT 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 11: Vent Pipe Preparation
Table 2. VENT LENGTH TABLE Number 3" of 90° Minimum Maximum Elbows Pipe (Ft./M.) Pipe (Ft./M.) Pipe (Ft./M.) ONE (1) TWO (2) THREE (3) FOUR (4) FIVE (5) SIX (6) 4-inch PVC may be used for a MAXIMUM intake of ONE HUNDRED TWENTY (120) EQUIVALENT FEET (36.6m) and a MAXIMUM exhaust of ONE HUNDRED TWENTY (120) EQUIVALENT FEET (36.6m). -
Page 12: Blocked Outlet Prover Switch
BLOCKED OUTLET PROVER SWITCH (SEE FIGURE 13) The Blocked Outlet Prover Switch is set up to shut the unit off when a build- up of positive pressure in the exhaust vent pipe occurs. This switch is a positive pressure switch that requires an increase in pressure to change the electrical contacts from normally closed to open. -
Page 13: Connection Of Gas Pipe
CONNECTION OF GAS PIPE When connecting gas pipe to unit, apply wrench to flange only. Note: Do not use wrench on gas valve or gas bracket. See Figure 15. PERFORM THE GAS LEAK TEST ANY TIME WORK IS DONE ON A GAS SYSTEM TO AVOID THE POSSIBILITY OF FIRE OR EXPLOSION WITH PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. -
Page 14: Water Line Connections
WATER LINE CONNECTIONS This manual provides detailed installation diagrams (see back section of this manual) for typical methods of application for the water heaters. The water heater may be installed by itself, or with a separate storage tank. CLOSED SYSTEM CAUTION A closed system will exist if a check valve (without bypass), pressure reducing valve (without bypass), or a water meter... -
Page 15: Operation
ITEM DESCRIPTION 1. Transformer 2. Control Board & Cable Ass'y 3. E.C.O./Temperature Probe 4. Blower Proving Air Switch 5. Low Voltage Cable Assembly 6. Line Voltage Cable Assembly 14. Tubing-Pressure 7. Blower/Motor Assembly 15. Tubing-Pressure 8. Igniter Assembly 17. Switch-On/Off 10. -
Page 16: Error Codes
GAS VALVE LED FLASHING This condition results from a failure to establish burner ignition after three successive trials. In such cases: 1. Investigate the possible cause and remedy any observations. 2. Momentarily depress the button on the display panel to reset the lockout condition. -
Page 17: Switch Open
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 18: Prior To Start-Up
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 19: Lighting Instructions
FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. -
Page 20: Cathodic Protection
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 21: Flushing
(part no. 4763) and 5 gallon (19L) (part no. 4813) sizes. Hydrochloric base acids are not recommended for use on glass-lined tanks. A.O. Smith Form No. 4800, entitled “Why, When and How”, describes tank cleaning methods and materials. UN•LIME and the booklet may be obtained through your A.O. -
Page 22: Drain Valve And Access Panels
To inspect or replace an anode: The anodes on this heater are easily accessible from the top of the heater making replacement simple and quick. 1. Turn the heater off per the lighting instructions. Connect a hose to the drain valve . Locate the hose's discharge in an area where hot water will not cause any damage or injury. -
Page 23: Installation Diagrams
ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION 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 4. IF HIGHER PREHEAT TEMPERATURES... - Page 24 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 4. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL...
- Page 25 TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATURE TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER HEATER) MUST BE IDENTICAL HEATERS FOR MULTIPLE HEATER INSTALLATION SEE MANIFOLD KIT SPECIFICATIONS, PAGE 28. CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED.
- Page 26 TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER) DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 4. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES WITH OR WITHOUT BUILDING RECIRCULATION * PIPE RELIEF VALVE TO OPEN DRAIN...
- Page 27 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 5. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
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Page 28: Manifold Kits
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 29: Checklist And Service Information
UNIT’S OPERATING SEQUENCE AND IGNITION SAFETY. IF YOU DO NOT HAVE THE PROPER TEST EQUIPMENT, I.E. A VOLT-OHM METER AND A MICROAMMETER, 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 MODULE... -
Page 30: 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, 5621 W. 115th Street, Alsip, IL 60803, 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 31: 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 32 A.O. SMITH WATER PRODUCTS COMPANY 5621 W. 115TH STREET • ALSIP, ILLINOIS 60803 PHONE: 1-800-433-2545 • FAX: 1-800-433-2515 www.hotwater.com • E-MAIL: parts@hotwater.com...