Operation; General - A.O. Smith BTI 120 Installation & Operation Manual

TABLE 8
APPROXIMATE TIME REQUIRED TO CONSUME
1 CU. FT. OF GAS AT FULL CAPACITY
INPUT TYPE
RATE OF
(BTUH) GAS
120,000 NATURAL
(35kW) PROPANE
154,000 NATURAL
(45kW) PROPANE
180,000 NATURAL
(53kW) PROPANE
190,000 NATURAL
(56kW) PROPANE
199,000 NATURAL
(58kW) PROPANE
250,000 NATURAL
(73kW) PROPANE
275,000 NATURAL
(81kW) PROPANE
310,000 NATURAL
(91kW) PROPANE
366,000 NATURAL
(107kW) PROPANE
399,000 NATURAL
(117kW) PROPANE
Figures shown are valid for 0-2000 ft. (0-610m) installations.
See "HIGH ALTITUDE INSTALLATIONS" for deration requirement
over 2000 ft. (610m).

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.
TIME REQ'D
BTUH TO CONSUME
PER 1 CU. FT.
CU. FT. OF GAS
1050 31.5 SEC.
2500 75.0 SEC.
1050 24.5 SEC.
2500 58.4 SEC.
1050 21.1 SEC.
2500 50.3 SEC.
1050 19.9 SEC.
2500 47.4 SEC.
1050 19.0 SEC.
2500 47.4 SEC.
1050 15.1 SEC.
2500 35.3 SEC.
1050 13.75 SEC.
2500 32.2 SEC.
1050 12.4 SEC.
2500 29.5 SEC.
1050 10.4 SEC.
2500 24.7 SEC.
1050 9.5 SEC.
2500 22.6 SEC.
Before proceeding with the operation of the unit make sure the
water heater and system are filled with water and all air is
expelled.
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.
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
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
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".
22
CAUTION
FILLING
WARNING
section of this manual prior
OPERATING