Electronic Ignition Control; Exhaust Inducer (Blower Assy.); Circulating Pump; Dishwashing Machine Requirement - A.O. Smith BTI 120 Installation & Operation Manual

ELECTRONIC IGNITION CONTROL

Each heater is equipped with a ignition module. The solid state
ignition control (Fig. 4), ignites the main burner by utilizing a
silicone nitride ignitor. The silicone nitride ignitor shuts off during
the heating cycle and the main burner flame is sensed through
a remote flame sensor integral to the silicone nitride ignitor
assembly. The ignition control will try to ignite the main burner
three times before lockout. Then it waits one hour before trying
again to ignite the main burners. This is a continuous cycle.
FIGURE 4 - IGNITION CONTROL BOARD

EXHAUST INDUCER (BLOWER ASSY.)

All units are equipped with a exhaust inducer (Fig. 5). The inducer
assists in drawing in fresh air to the unit for combustion and
then assists in dispensing the combustion by-products into the
venting leading outside.
The exhaust inducer is equipped with a gravity controlled damper
to reduce the amount of heat loss through the flue, improving
efficiency.
FIGURE 5 - EXHAUST INDUCER

CIRCULATING PUMP

A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the
heater. Refer to the piping diagrams at rear of manual for electrical
hookup information and install in accordance with the latest
version of the National Electric Code ANSI/NFPA No. 70.
Only all bronze circulators are used with commercial water
heaters.
Although circulators are oiled and operated by the manufacturer
some circulators must be oiled again before operating. Please
refer to manufacturer's instructions.

DISHWASHING MACHINE REQUIREMENT

These appliances meet the National Sanitation Foundation
Standard for sanitary installations when used with the following
leg kits, Part No's. 6570-0 and 6570-7.
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water
flow pressures between 15 (1 bar) and 25 psi (1.7 bars). Flow
pressures above 25 psi (1.7 bars), or below 15 psi (1 bar), will
result in improperly sanitized dishes. Where pressures are
high, a water pressure reducing or flow regulating control valve
should be used in 180 F (82°C) line to the dishwashing machine,
0
and should be adjusted to deliver water between these limits.
The National Sanitation Foundation also recommends
circulation of 180 0 F(82°C) water. Where this is done, the
circulation should be very gentle so that it does not cause any
unnecessary turbulence inside the water heater. The circulation
should be just enough to provide 180
of take-off to the dishwashing machine. Adjust flow by means of
the plug cock in the circulating line.

INSTALLATION INSTRUCTIONS

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.
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.

UNCRATING

The heater is shipped with the inducer already installed. The
wiring conduit runs from the thermostat to the inducer. Before
turning unit on, check to make sure the wiring conduit is securely
plugged into the inducer.

LOCATING THE HEATER

THERE IS A RISK IN USING FUEL BURNING APPLIANCES
SUCH AS GAS WATER HEATERS IN ROOMS, GARAGES OR
OTHER AREAS WHERE GASOLINE, OTHER FLAMMABLE
LIQUIDS OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE
STORED, OPERATED OR REPAIRED. FLAMMABLE VAPORS
ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE
IGNITED BY THE HEATER'S PILOT OR MAIN BURNER FLAMES
CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES PERMIT
OPERATION OF GAS APPLIANCES IN SUCH AREAS IF THEY
ARE INSTALLED 18" OR MORE ABOVE THE FLOOR. THIS MAY
REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT
BE AVOIDED.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT.
water heater must be placed on a metal or wood panel extending
beyond the full width and depth by at least 3 inches in any direction.
If the heater is installed in a carpeted alcove, the entire floor
shall be covered by the panel. Also, see the DRAINING
requirements in MAINTENANCE Section.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
6
F (82°C) water at the point
0
WARNING
WARNING
Instead the