Levelling; Clearances; Hard Water; Air Requirements - A.O. Smith BTI 120 Installation & Operation Manual

FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack or
chimney as practicable, with adequate air supply and as
centralized with the piping system as possible.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT
WILL BE SUBJECT TO FREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD BE
LOCATED IN AN AREA WHERE LEAKAGE FROM THE HEATER
OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE
ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2" (51mm)
deep, with length and width at least 2" (51mm) greater than the
diameter of the heater and must be piped to an adequate drain.
The pan must not restrict combustion air flow.
For appliance installation locations with elevations above
2000 feet (610m), refer to HIGH ALTITUDE INSTALLATIONS
section of this manual for input reduction procedure.
LEVELING
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.

CLEARANCES

These heaters are approved for installation on combustible
flooring in an alcove when the minimum clearance from any
combustion construction are followed as indicated in figure 6
and Table 4.
Model BTI 366 is approved for installation on non-cumbustible
flooring or combustible flooring with leg kit part no. 6570.
In all installations the minimum combustible clearances from
vent piping shall be 6" (152mm). Vent piping passing through a
combustible wall or ceiling must be a continuous run (no joints)
and retain the 6" (152mm) clearance unless an approved
reducing thimble is used.
A service clearance of 24" (610mm) should be maintained from
serviceable parts, such as relief valves, flue baffles, thermostats,
cleanout openings or drain valves.
The units are approved for installation with side, rear and ceiling
clearances as indicated below:
MINIMUM CLEARANCES TO COMBUSTIBLES
MODEL "A"
RIGHT SIDE LEFT SIDE
BTI-120 2" (51mm) 2" (51mm)
BTI-154 1" (25.4mm) 1" (25.4mm)
BTI-180 3" (76mm) 3" (76mm)
BTI-199 3" (76mm) 3" (76mm)
BTI-200/A 2" (51mm) 2" (51mm)
BTI-250/A 2" (51mm) 2" (51mm)
BTI-275/A 2" (51mm) 2" (51mm)
BTI-310/A 3" (76mm) 3" (76mm)
BTI-366/A 3" (76mm) 3" (76mm)
BTI-400/A 3" (76mm) 3" (76mm)
TABLE 4
WARNING
"B" "C" "D"
BACK CEILING
2" (51mm) 12" (305mm)
1" (25.4mm) 12" (305mm)
3" (76mm) 12" (305mm)
3" (76mm) 12" (305mm)
2" (51mm) 12" (305mm)
2" (51mm) 12" (305mm)
2" (51mm) 12" (305mm)
3" (76mm) 12" (305mm)
3" (76mm) 12" (305mm)
3" (76mm) 12" (305mm)
CLEARANCES TO NONCOMBUSTION CONSTRUCTION
MODEL "A"
RIGHT SIDE
BTI-120 0
BTI-154 0
BTI-180 3" (76mm)
BTI-199 3" (76mm)
BTI-200/A 0
BTI-250/A 0
BTI-275/A 0
BTI-310/A 0
BTI-366/A 0
BTI-400/A 3" (76mm)
TABLE 5

HARD WATER

Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwashers, coffee urns, water heaters, water piping
and other equipment.
See MAINTENANCE section for details of tank cleanout
procedure.

AIR REQUIREMENTS

REFER TO THE LATEST EDITION OF THE "NATIONAL FUEL
GAS CODE" ANSI Z223.1/NFPA 54.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY
OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION
PRODUCTS RESULTING IN AIR CONTAMINATION THAT MAY
BE HAZARDOUS TO LIFE. SUCH A CONDITION OFTEN WILL
RESULT IN A YELLOW, LUMINOUS BURNER FLAME, CAUSING
CARBONING OR SOOTING OF THE COMBUSTION CHAMBER,
BURNERS AND FLUE TUBES AND CREATES A RISK OF
ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a
heater, sufficient openings for air must be provided in the walls.
UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN
INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR
COMBUSTION. SOOTING MAY RESULT IN SERIOUS DAMAGE
TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
If the unconfined space is within a building of tight construction
(buildings using the following construction: weather stripping,
heavy insulation, caulking, vapor barrier, etc.), air for combustion,
ventilation and draft hood dilution must be obtained from
outdoors. The installation instructions for confined spaces in
tightly constructed buildings must be followed to ensure
adequate air supply.
CONFINED SPACE
When drawing combustion and dilution air from inside a
conventionally constructed building to a confined space, such a
space shall be provided with two permanent openings, ONE IN
OR WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE TOP
7
"B" "C"
LEFT SIDE BACK CEILING
0 0 12" (305mm)
0 0 12" (305mm)
3" (76mm) 3" (76mm) 12" (305mm)
3" (76mm) 3" (76mm) 12" (305mm)
0 0 12" (305mm)
0 0 12" (305mm)
0 0 12" (305mm)
0 0 12" (305mm)
0 0 12" (305mm)
3" (76mm) 3" (76mm) 12" (305mm)
WARNING
"D"