LAARS Mini-Therm JVi - Install and Operating Manual - Manual (Page 7)

LAARS Heating Systems
Page 6
U.S. ANSI standard Z223.1 or in Canada, CAN/CGA-
B149.1 or .2, and any local codes that may be
applicable.
In general, these requirements specify that the
boiler rooms which represent confined spaces should
be provided with two permanent air supply openings;
one within 12 inches (305mm) of the ceiling, the other
within 12 inches (305mm) of the floor.
Outside Air Supply: When combustion air is
supplied directly through an outside wall, each
opening should have a minimum free area of one
square inch per 4,000 BTU/h (6 sq. cm per 1.2 kW)
input of the total input rating of all appliances in the
enclosed area.
Inside Air Supply: When combustion is
supplied from inside the building, each opening
should have a minimum free area of one square inch
per 1,000 BTU/h (6 sq. cm per 0.3 kW) input of the
total input rating of all appliances in the enclosed
area. These openings should never be less than 100
square inches (645 sq. cm).
NOTE: In Canada, follow Canadian Standard,
CAN/CGA-B149 or local codes.
Figure 3. Gas Supply Piping.
HORIZONTAL
DROP
TO BOILER
SEDIMENT TRAP
OR DRIP LEG
TO BOILER
RISER
SEDIMENT TRAP
OR DRIP LEG
Exhaust Fans or Vents: Any equipment which
exhausts air from the boiler room can deplete the
combustion air supply or reverse the natural draft
action of venting system. This could cause flue
products to accumulate in the boiler room. Additional
air must be supplied to compensate for such exhaust.
The information in Table 8 is not applicable in
installations where exhaust fans or blowers of any
type are used. Such installations must be designed by
qualified engineers.
If a blower or fan is used to supply air to the
boiler room, the installer should make sure it does not
create drafts which could cause nuisance shutdowns. If
a blower is necessary to provide adequate combustion
air to the boiler, a suitable switch or equivalent must
be wired into the boiler control circuit to prevent the
boiler from firing unless the blower is operating.
The boiler must be completely isolated and
protected from any source of corrosive chemical
fumes such as those emitted by trichloroethylene,
perchloroethylene, chlorine, etc.
1H. Venting
WARNING
This boiler must be vented in accordance with Part
7, Venting of Equipment, of the latest edition of the
National Fuel Gas code, ANSI Z223.1 and all
applicable local building codes. In Canada, follow
CAN/CGA B149 Installation codes. Improper venting
of this appliance can result in excessive levels of
carbon monoxide which can result in severe
personal injury or death!
The boiler vent collar must be fastened directly
to an unobstructed vent pipe of the same diameter
with rustproof sheet metal screws no longer than 1/2"
(13mm) and located to prevent interference with the
inducer damper.
3" (76mm)
MIN.
3" (76mm)
MIN.
Table 8. Minimum Recommended
Air Supply to Boiler Room.
Boiler Size Outside Air Area Inside Air Area
sq. in sq. cm sq. in. sq. cm
50 15 97 100 645
75 20 129 100 645
100 25 161 100 645
125 32 206 125 807
160 40 258 160 1032
225 60 387 225 1452
*Area indicated is for one of two openings: one at floor level
and one at the ceiling, so the total net free area would be
double the figures shown. For special conditions, refer to
NFPA54 ANSI Z223.1. In Canada, refer to the National
Standard CAN1-B149.1 or .2, which differs from this table.
NOTE: Check with louver manufacturers for Net Free Area of
Louvers. Correct for screen resistance to the Net Free Area if a
screen is used.