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18

OPERATION

IMPORTANT

A qualified person must perform the initial firing of the heater.  At
this time the user should not hesitate to ask the individual any
questions which they may have in regard to the operation and
maintenance of the unit.

An Operational Checklist is included at the rear of this manual.
By using this checklist the user may be able to make minor
operational adjustments and avoid unnecessary service calls.
However, the user should not attempt repairs which are not listed
under the USER column.

GENERAL

NEVER OPERATE THE HEATER WITHOUT FIRST BEING
CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE
AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF
VALVE OPENING OF THE HEATER.

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE APPLIANCE.

 

CAUTION

Before proceeding with the operation of the unit make sure
the water heater and system are filled with water and all air is
expelled.

FILLING

1. Close the heater drain valve by turning handle clockwise.
2. Open a nearby hot water faucet to permit the air in the system

to escape.

3. Fully open the cold water inlet pipe valve  allowing the heater

and piping to be filled.

4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.

 WARNING

THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR
AT LEAST 5 MINUTES.  This waiting period is an important
safety step.  Its purpose is to permit gas that may have
accumulated in the combustion chamber to clear.  IF YOU
DETECT GAS ODOR AT THE END OF THIS PERIOD DO NOT
PROCEED WITH LIGHTING.  RECOGNIZE THAT GAS EVEN IF IT
SEEMS WEAK, MAY INDICATE PRESENCE OF ACCUMULATED
GAS SOMEPLACE IN THE AREA WITH RISK OF FIRE OR
EXPLOSION.  SEE THE FRONT PAGE FOR STEPS TO BE TAKEN.

All gas and water lines leak tested and open.

Read 

SEQUENCE OF OPERATION

 

section of this manual prior to

lighting and operating this appliance.

With above conditions satisfied, start the unit in accordance with
the instructions on the Operating label attached to the heater.  If
label instructions are not legible - determine which gas valve the
appliance is equipped with and use the applicable 

OPERATING

INSTRUCTIONS

 as follows:

Each heater is equipped with an ignition control board.  The
controller will try three times to light the main burner before going

into lockout.  After the controller tries three times, it will wait one
hour before trying to light the unit again.  This cycle will continue
until the main burners are ignited or the unit is shut down.

ADJUSTMENTS

ON INITIAL STARTUP SOME ADJUSTMENTS ARE NECESSARY.

1.

CHECK MANIFOLD AND INLET GAS PRESSURES.

2.

CYCLE CHECK - CHECK AT LEAST ONE BURNER OPERATION
- WHEN THERMOSTAT IS SATISFIED, BURNER WILL SHUT
OFF AND INDUCER WILL STOP RUNNING.  ON CALL FOR
HEAT - THE INDUCER WILL COME ON AND CLOSE THE
PRESSURE SWITCH AND THE IGNITION SEQUENCE
DESCRIBED ABOVE WILL BEGIN, SEE “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.

5.

Exhaust Inducer begins drawing air through appliance
closing the Prover Switch.

6.

On completion of Prover Switch engagement, the Ignition
Control Board begins the ignition cycle.

7.

The Ignition Control Board provides power to the Silicon
Nitride Ignitor.

8.

The Silicon Nitride Ignitor heats up for approximately 17 to
20 seconds.

9.

At the end of Silicon Nitride Ignitor’s warm-up, the Ignition
Control Board opens the Gas Valve.

10. From the time the Gas Valve opens, the Ignition Control

Board waits 3 seconds and then shuts off power to the
Silicon Nitride Ignitor.

11. From the time the Silicon Nitride Ignitor’s power is shut off,

the Ignition Control Board waits 3 more seconds to monitor
the Flame Sensor.

12. If the Flame Sensor does not detect a strong enough flame,

the Ignition Control Board shuts off the Gas Valve and allows
the Exhaust Inducer to purge the unit for 20 seconds.  At that
time, the Ignition Control Board restarts with step 7.  It will try
and ignite the main burners 2 more times.  If the unit does
not light, the Ignition Control Board will wait one hour and
then restart at step 3.  This cycle will continue until the unit
lights or the power is shutoff to the unit.

13. If the Flame Sensor detects a strong flame, the Ignition

Control Board will allow the unit to operate until the thermostat
is satisfied.

14. Once the unit is satisfied, the Ignition Control Board will

shut off the Gas Valve and the unit will be in standby mode
until another call for heat is initiated by the thermostat.

See the flow chart on page 25 for more information.

Содержание BTR 151 THRU 201/A

Страница 1: ...in U S A 1004 PART NO 196308 001 ADIVISION OFA O SMITH CORPORATION McBEE SOUTH CAROLINA USA www aosmithwaterheaters com CAUTION TEXT IN BLACK BOLD TYPE OR UNDERLINED CONTAINS INFORMATION RELATIVE TO Y...

Страница 2: ...the absence of local codes the installation must comply with the latest editions of the National Fuel Gas Code ANSI Z223 1 NFPA 54 and the National Electrical Code NFPA 70 documents are available fro...

Страница 3: ...ater is due to a corrosive atmosphere Refer to the limited warranty for complete terms and conditions IMPROPER COMBUSTION WARNING ATTICAND OREXHAUSTFANSOPERATINGONTHEPREMISES WITHAWATER HEATER CAN RES...

Страница 4: ...the heater input rate should be reduced at high altitudes for satisfactory operation with the reduced oxygen supply Failure to make this reduction would result in an overfiring of the heater causing s...

Страница 5: ...R BLOWER ASSEMBLY All units are equipped with a exhaust inducer The inducer assists in drawing in fresh air to the unit for combustion and then assists in dispensing the combustion by products into th...

Страница 6: ...D BE LOCATEDINANAREAWHERELEAKAGEFROMTHEHEATEROR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE ADJACENTAREAORTOLOWERFLOORSOFTHESTRUCTURE WHEN SUCH LOCATIONS CANNOT BEAVOIDED ASUITABLE DRAINPANSHOULDBEIN...

Страница 7: ...protected from freezing downdrafts Remove all soot or other obstructions from the chimney that will retard a free draft Type B venting is recommended with these heaters This water heater must be vente...

Страница 8: ...ell Excessive pressure may develop in such closed systems causing premature tank failure or intermittent relief valve operation This is not a warranty failure An expansion tank or a similar device may...

Страница 9: ...THAT ALL GAS PIPE IS CLEANONTHEINSIDE TOTRAPANYDIRTORFOREIGNMATERIALINTHEGASSUPPLY LINE A DIRT LEG SOMETIMES CALLED SEDIMENT TRAP OR DRIP LEG MUST BE INCORPORATED IN THE PIPING SEE FIG 9 THE DIRT LEG...

Страница 10: ...with the latest version of the National Electrical Code ANSI NFPA No 70 must FIGURE10 SINGLEUNITWIRINGDIAGRAM conform to all local code authority having jurisdiction AN ELECTRICAL GROUND IS REQUIRED...

Страница 11: ...temperature and pressure relief valve of adequate capacity is installed on the heater The locations shown in the installation diagrams on the following pages are typical The discharge opening of the t...

Страница 12: ...D NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 20 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FO...

Страница 13: ...E TOGGLESWITCHMUSTBECLOSED ON DURING THERINSEOPERATIONANDOPEN OFF WHENDISHWASHER IS NOTOPERATING OR WHEN ON LONG STANDBY NOTE 2 INSTALLLINETEMPERATURECONTROLINANUNINSULATED TEEBEYONDTHEDISHWASHINGMACH...

Страница 14: ...ons shown in the installation diagrams on the following pages are typical TWO TEMPERATURE TWO HEATERS ONE PRE HEATER ONE BOOSTER HEATER WITH OR WITHOUT BUILDING RECIRCULATION The discharge opening of...

Страница 15: ...TE 3 ADJUST PLUG COCK SO THE SANITIZING LOOP FLOW RATE DOES NOT CAUSE UNNECESSARY TURBULENCE IN THE TANK PIPE RELIEF VALVE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH LOCAL CODES CIRCULATING RETURN LINE...

Страница 16: ...RS WITH MIXING VALVE TWO PRE HEATERS WITH BOOSTER HEATER DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 20 IF HIGHER PREHEA...

Страница 17: ...STER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES 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 TEMPERAT...

Страница 18: ...in burner before going into lockout After the controller tries three times it will wait one hour before trying to light the unit again This cycle will continue until the main burners are ignited or th...

Страница 19: ...tes to clear out any gas If you then smell gas STOP Follow B in the safety information above on this label If you don t smell gas go on to the next step 7 Turn gas control knob counterclockwise to ON...

Страница 20: ...INJURYOCCURS VARIES WITH THE PERSON S AGE AND TIME OF EXPOSURE THE SLOWER RESPONSETIMEOFCHILDREN AGEDORDISABLEDPERSONS INCREASES THE HAZARDS TO THEM NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER TAP...

Страница 21: ...o decrease gas pressure and input rate 4 Clock the meter as in step 2 above 5 Repeat steps 3 and 4 until the specified input rate is achieved 6 Turn the gas control knob to PILOT Remove the pressure g...

Страница 22: ...for cleaning inspection or removal of inner parts you obtain two new nipple collars part no 74060 The nipple collars on the heater will usually be damaged when removed New pipe collars will insure th...

Страница 23: ...sed DELIMINGUSINGFLO JUGMETHOD UN LIME in the 5 gallon size is recommended for deliming of the BT 80 100 models UN LIME with the necessary hoses and fittings to delime your heater is also available as...

Страница 24: ...luding the complete model and serial number as it appears on the product Refer to the parts list for more information REPLACEMENT PARTS 7 Lower container you may have to place the container on its emp...

Страница 25: ...engages Prover Switch Ignition Control Board provides power to Silicon Nitride Ignitor Silicon Nitride Ignitor warms up for 20 seconds Ignition Control Board opens Gas Valve Ignition Control Board sh...

Страница 26: ...Replace dual bulb controller if differential is too wide greater than 4 F Heater recovery is slower Call serviceman Check gas input If incorrect adjust gas pressure or replace main burner orifice Dra...

Страница 27: ...valves etc is installed in the cold water supply the heater is connected to unless an effective method of controlling thermal expansion is also installed at the heater s and operational at all times T...

Страница 28: ...28 A O SMITH WATER PRODUCTS COMPANY 5621 W 115TH STREET ALSIP ILLINOIS 60803 PHONE 1 800 433 2545 FAX 1 800 433 2515 www aosmithwaterheaters com E MAIL parts hotwater com...

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