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A.O. Smith 500A - page 1
1 PLACE THESE INSTRUCTIONS ADJACENT TO HEA TER AND NOTIFY OWNER T O KEEP FOR FUTURE REFERENCE. PRINTED 0307 197373-003 CYCLONE Xi ® Model BTH 300A, 400A, 500A COMME R CIA L GAS W A TER HEA TER GAS-FIRED POWER BURNER FOR DOMESTIC HOT W A TER Thank you for buying t his energy e fcient wa ter heater from A.O. Smith W ater Products Company . We app ...
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A.O. Smith 500A - page 2
2 These designs comply with the current edition of the American National Standard for Gas Water Heaters, V olume III, ANSI Z21.10.3 / CSA 4.3 as an automatic circulating tank water heater , and automatic storage water heaters. Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer with a referenc ...
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A.O. Smith 500A - page 3
3 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 BURN S RE SULTIN G IN SER IOUS PERSO NAL INJURY AND /OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLO ...
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A.O. Smith 500A - page 4
4 “A T A GLANCE ” BTH 300/400/500 QUICK INST ALLA TION TIPS Horizontal Sidewall V enting V er tical Roof top Venting ...
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A.O. Smith 500A - page 5
5 The temperature may be adjusted from 80°F/27°C to 180°F/82°C. The temperature 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 recommende d, in all cases, that the water temperature be set for the lowest temperatur ...
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A.O. Smith 500A - page 6
6 TH E HEA TE R SHA LL BE LOCA TE D OR PR OT ECT ED SO IT IS NO T SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE. DO NOT LOCA TE THE HEA TER WHERE NOISE FROM THE EXHAUST OR INT AKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCA TIONS CLOSE TO OR ACROSS FROM WINDOWS AND DOORS. A VOID ANCHORING THE VENT AND INT AKE PIPES DIRECTL Y TO FRAMED WALLS, FLOORS ...
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A.O. Smith 500A - page 7
7 CLEARANCES These heaters are approved for installation on combustible ooring 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". V ent piping passing through a combustible wall or ceiling m ...
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A.O. Smith 500A - page 8
8 INST ALLA TION REQUIREMENTS FOR THE COMMONWEAL TH OF MASSACHUSETTS For all side wall terminated, horizontally vented power vent, direct ven t, and pow er dir ect ven t gas fue led wat er hea ter s inst all ed in ever y dwelling, building or structure used in whole or in part for residential purpos es, including those owned or operated by the Comm ...
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A.O. Smith 500A - page 9
9 US DIRECT VENT CANADIAN DIRECT VENT FIGURE 5. CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULA TING TO THE AI R I NT AKE IN WI NDY /C OLD AR EAS , T HE MAX IM UM PRA CT ICA L DIST ANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. ...
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A.O. Smith 500A - page 10
10 US HORIZONT A L VENT CANADIAN HORIZONT AL VENT FIGURE 6. CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULA TING TO THE AI R I NT AKE IN WI NDY /C OLD AR EAS , T HE MAX IM UM PRA CT ICA L DIST ANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. ...
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A.O. Smith 500A - page 11
1 1 W ARNING N EV ER OP E R A T E TH E HE AT E R U N L E S S IT I S VE N T E D T O T H E O U TD O O R S AN D H AS A D EQ U A T E A I R SU P P L Y T O A V O I D RI S K S O F I MP RO P ER O P ER AT I O N, F I RE , E XP LO S IO N O R AS P H YX IA T IO N. VENT PIPE TERMINA TION NOTE: Before installing venting, determine place of vent pipe termination. ...
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A.O. Smith 500A - page 12
12 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. INST ALLA TION 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 pi ...
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A.O. Smith 500A - page 13
13 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). The resulting gap will be cov ...
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A.O. Smith 500A - page 14
14 VENT PIPE PREP ARA TION 1. INITIAL PREP ARA TION A. Make sure the solvent cement you are planning to use is designed for the specic application you are attempting. B. Kn ow the phys ic al and ch em ic al char ac te ri st ics and limi ta ti on s of the PVC, PVC cellula r core, ABS or CPVC pipin g materi als that you are about to use. C. Know t ...
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A.O. Smith 500A - page 15
15 CAUTION THE W A TER HEA TER IS POLARITY SENSITIVE. BEFORE APPL YING ELECTRICITY TO THIS HEA TER BE CERT AIN THA T SUP PL Y NEUT RAL WIRE TO GRO UND CHEC K INDI CA TES ZERO VOL T AGE. HOT SURF ACE IGNITER The Hot Surface Igniter is a device that ignites the main burner by high temperature (>1800°F or >982°C). When 120V AC is applied to th ...
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A.O. Smith 500A - page 16
16 T o prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve inlet. Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply compound to the rst two threads. Use compounds resistant to the action of liqueed petroleum gases. DISCONNECT THE APPLIA ...
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A.O. Smith 500A - page 17
17 codes or contact the water supplier or local plumbing inspector on how to control this situation. W A T E R ( PO T A B LE ) H EA T I N G A N D S P A C E H E A TI N G 1. All piping components connected to this unit for space heating applications shall be suitable for use with potable water . 2. T oxic chemicals, such as those used for boiler trea ...
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A.O. Smith 500A - page 18
18 FIGURE 15. BTH 300 WIRING DIAGRAM ...
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A.O. Smith 500A - page 19
19 FIGURE 16. BTH 400 AND 500 WIRING DIAGRAM ...
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A.O. Smith 500A - page 20
20 OPERA TION SEQUENCE OF OPERA TION T ypical Control/Appliance Operating Sequence 1. When the control is powered, it should display the unit model, water temperature, setting temperature and heater status. 2. If the contro l determ ine s tha t the actu al water temp era ture insi de the tank is below the programme d tempera ture setpoint less the ...
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A.O. Smith 500A - page 21
21 3. Adjusting the Operating Set Point The Operating Set Point of this water heater determines the regulated temperature for the water in the tank. This parameter is adjusted in the T emperature menu. Items in this menu allow you to monitor different temperature readings in the tank along with adjusting the Operating Set Point and Differential . ...
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A.O. Smith 500A - page 22
22 4. Changing the Display Units The display interface to the heater has the option of selecting between degrees and Fahrenheit and degrees Celsius for temperature displays. This can be found in the "Display Settings" menu. Also in this menu, you may adjust how the backlight operates and the contrast of the LCD screen. 5. Fault and W arni ...
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A.O. Smith 500A - page 23
23 • Faults: This is a safety related condition that has been detected by the heater . NOTE: When these conditions occur , the water heater will not continue any further heating cycles and the water will no longer be heated until the condition is corrected and, in most cases, power has been cycled. Example of a Fault: Advanced Diagnostics Informa ...
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A.O. Smith 500A - page 24
24 7. V iewing the Fault History The controller for this water heater will store a history of ten of the last Fault and W arning conditions that occurred. This is stored in the Fault History . Along with all the information about the fault, including a estimate time of when the fault occurred, information regarding the advanced diagnostics for that ...
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A.O. Smith 500A - page 25
25 DO N OT U SE T HIS HEA TER IF ANY PAR T HA S BE EN U NDER WA T E R . IM ME D I A TE L Y C AL L A Q UA L I F IE D S E RV ICE T E C HN ICI A N TO INSP EC T THE HEAT ER AND TO RE PL AC E ANY PART OF THE CO NTR OL SYS TE M AND ANY GAS CON TR OL WHI CH HAS BEEN UND ER W ATE R. LIGHT THE UNIT IN ACCORDANCE WITH THE OPERA TING INSTRUCTIONS LABEL A TT A ...
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A.O. Smith 500A - page 26
26 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 4.0" (0.996 kPa) W ater Column. Clockwise to increase gas pressure and input rate. Counterclockwise to decrease gas pressure and input r ...
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A.O. Smith 500A - page 27
27 W ARNING UNDER NO CIRCUMST ANCES SHOULD THE INPUT EXCEED THE RA TE SHOWN ON THE HEA TER RA TING PLA TE. OVERFIRING COULD RESUL T IN DAMAGE OR SOOTING OF THE HEA TER. CA THODIC 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). ...
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A.O. Smith 500A - page 28
28 FLUSHING 1. T urn off the heater electrical disconnect switch. 2. Open the drain valve and allow water to ow until it runs clean. 3. Close the drain valve when nished ushing. 4. T urn on the heater electrical disconnect switch. DRAINING The heater must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance ...
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A.O. Smith 500A - page 29
29 POWERED ANODE SYSTEM T o insure a long, trouble-free operating life, BTH 300, 400 and 500 are factory equipped with a powered anode system. The anodes are of a permanent design and do not need replacing unless damaged. DRAIN V AL VE AND ACCESS P ANELS The heaters are equipped with a 3/4" drain valve. An access panel covers the cleanout open ...
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A.O. Smith 500A - page 30
30 ONE TEMPERA TURE - ONE HEA TER HORIZONT AL ST ORAGE T ANK FORCED CIRCULA TION WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE A T FIXTURES. SEE WA TER TEMPERA TURE CONTROL WARNING ON P AGE 3 . I F H IG H ER P RE H EAT T EM P ER ATU RE S AR E NECESSARY TO OBT AIN ADEQUA TE BOOSTER OUTPUT , A ...
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A.O. Smith 500A - page 31
31 * PIPE RELIEF V AL VE T O OPEN DRAIN. NOTE: IF TEMPERED WA TER IS RECIRCULA TED, RETURN LINE SHOULD BE CONNECTED A T POINT “A”. INST ALL IN ACCORDANCE WITH LOCAL CODES. TWO TEMPERA TURE - ONE HEA TER HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE A T FIXTURES. SEE WA ...
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A.O. Smith 500A - page 32
32 TWO TEMPERA TURE - TWO HEA TERS HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION TWO TEMPERA TURE - THREE HEA TERS (TWO PRE-HEA TERS/ONE BOOSTER HEA TER) WITH OR WITHOUT BUILDING RECIRCULA TION MUST BE IDENTICAL HEA TERS FOR MUL TIPLE HEA TER INST ALLA TION SEE MANIFOLD KIT SPECIFICA TIONS, P AGE 35. CAUTION : IF BUILDING COLD WA TER SU ...
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A.O. Smith 500A - page 33
33 * PIPE RELIEF V AL VE TO OPEN DRAIN ** 140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM W A TER TEMPERA TURE MAINT AINED IN THE PRE-HEA TERS. 120°F (49°C) SHOULD BE THE MINIMUM TEMPERA TURE OF W A TER IN THE PRE-HEA TERS. CONNECT CIRCULA TING LINE FROM FIXTURES, IF USED, TO COLD W A TER SUPPL Y LINE OF PRE-HEA TER. CONNEC T CIRCU LA TING LINE ...
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A.O. Smith 500A - page 34
34 NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) W A TER CIRCULA TION. INST ALL ON OR CLOSE TO DISHWASHER. TO GGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERA TION AND OPEN (OFF) WHEN DISHWASHER IS NOT OPERA TING OR WHEN ON LONG ST ANDBY . NOTE 2: INST ALL LINE TEMPERA TURE CONTROL IN AN UNINSULA TED TEE BEYOND THE DISHWASHER T AKEOFF IN T HE ...
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A.O. Smith 500A - page 35
35 MUL TIPLE UNIT INST ALLA TIONS Proper installation of multiple water heaters assures water ow 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 ow may have a shortened life. Dimensions shown are for minimum space occupied by the w ...
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A.O. Smith 500A - page 36
36 C H E C K L I S T A N D S E R V I C E I N F O R M A T I O N IMPORT ANT The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re-red after a prolong ed shutdown. HOWEVER, it is recommended that only qualied servicemen, using appropriate test equipment , be allow ...
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A.O. Smith 500A - page 37
37 Checking these four (4) items rst will often result in a timely solution to the service call. W ARNING JUMPING OUT COMPONENTS AND/OR CIRCUITS DURING TROUBLESHOOTING CAN CAUSE SERIOUS PROBLEMS WITH THE UNIT’S OPERA TING SEQUENCE AND IGNITION SAFETY . IF YOU DO NOT HA VE THE PROPER TEST EQUIPMENT , I.E. A VOL T -OHM METER AND A MICROMETER, DO ...
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A.O. Smith 500A - page 38
38 NOTE: Always turn off and disconnect main supply wiring before servicing the unit. 4. Check connecting wire to the ame sensor . V erify that the ame sensor has not been damaged in any way . 5. V erify tha t the air supply is adeq uate . The air inle t scree n or blow er wheel may be restricted. Also, check the installation for proper venti ...
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A.O. Smith 500A - page 39
39 Model BTH Limited W arranty A. O. Smith Corporation, the warrantor , extends the following LIMITED W ARRANTY to the owner of this water heater . 1. THE T ANK 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 rst THREE years ...
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A.O. Smith 500A - page 40
40 www .hotwater .com ...
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