Instruction/ maintenance manual of the product 300A A.O. Smith
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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.
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.
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.
4 “A T A GLANCE ” BTH 300/400/500 QUICK INST ALLA TION TIPS Horizontal Sidewall V enting V er tical Roof top Venting.
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 .
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.
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".
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 i.
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.
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.
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.
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).
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.
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.
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).
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.
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 .
18 FIGURE 15. BTH 300 WIRING DIAGRAM.
19 FIGURE 16. BTH 400 AND 500 WIRING DIAGRAM.
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.
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 .
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.
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.
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.
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.
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.
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).
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.
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.
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 .
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.
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.
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.
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 .
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.
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.
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 .
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.
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 h.
40 www .hotwater .com.
An important point after buying a device A.O. Smith 300A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought A.O. Smith 300A yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data A.O. Smith 300A - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith 300A you will learn all the available features of the product, as well as information on its operation. The information that you get A.O. Smith 300A will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith 300A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime A.O. Smith 300A.
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith 300A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith 300A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
