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4
Venting
(continued)
!
WARNING
Sources of combustion air contaminants,
including chlorines, chlorofluorocarbons (CFC's),
petroleum distillates, detergents, volatile vapors
or other chemicals must not be present in the
boiler room. If any of these contaminants is
present, severe boiler corrosion and failure will
result.
2. Outdoor Openings to Boiler Room
a. Provide combustion and ventilation air to
the boiler room or enclosure. Follow the
National fuel Gas Code, ANSI Z223.1, or, in
Canada, Installation Code for Gas Burning
Appliances and Equipment, CGA Standard
B149 Code as well as all applicable
local codes. Use one of the following two
methods.
b. Two Permanent Openings Method: Provide
two permanent openings, once within 12 in.
(300 mm) of the top of the enclosure and
one within 12 in. (300 mm) of the bottom of
the enclosure. Openings must communicate
directly, or by ducts, with the outdoors or
spaces that freely communicate with the
outdoors, as follows:
i.
Direct communication or through
vertical ducts: minimum free area of
each opening shall be 1 in.
hr (550 mm
2
all appliances within the enclosure.
ii. Horizontal ducts: minimum free area of
each opening shall be 1 in.
hr (1,100 mm
all appliances within the enclosure.
c. One Permanent Opening Method: Provide
one permanent opening, commencing
within 12 in. (300 mm) of the top of the
enclosure. The opening shall communicate
through a vertical or horizontal duct to the
outdoors or spaces that freely communicate
with the outdoors and shall have a minimum
free area of the following:
i.
1 in.
/3,000 Btu/hr (700 mm
2
input rating of all appliances located
within the enclosure.
ii. Not less than the sum of the areas of all
vent connectors in the space.
d. Motorized Louvers or Dampers: Motorized
louvers or dampers must be interlocked
with the boiler to allow ignition and firing
of the burner only when louvers are in the
fully-open position. Wire the interlock to the
Auto Reset External Limit connections. See
Section 8 "Electrical".
106308-05 - 3/23
/4,000 Btu/
2
/kW) of total input rating of
/2,000 Btu/
2
/kW) of total input rating of
2
/kW) of total
2
APEX
Installation, Operating, & Service Instructions
3. Terminations
a. For standard horizontal sidewall
terminations, see Figures 4-6 and 4-7. When
using room air for combustion, use 90°
elbow or tee for sidewall vent termination.
NOTICE: Use 90° elbow or tee for horizontal
sidewall vent termination when using room air for
combustion.
b. For vertical roof terminations, see Figures
4-9 and 4-10.
F. Removing the Existing Boiler
When an existing boiler is removed from a
common venting system, the common venting
system is likely to be too large for proper venting
of the remaining appliances. At the time of
removal of an existing boiler, the following steps
shall be followed with each appliance remaining
connected to the common venting system placed
in operation, while the other appliances remaining
connected to the common venting system are not
in operation.
1. Seal any unused openings in the common
venting system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine
there is no blockage or restriction, leakage,
corrosion, and other deficiencies which could
cause an unsafe condition.
3. Insofar as is practical, close all building doors
and windows and all doors between the space
in which the appliances remaining connected
to the common venting system are located and
other spaces of the building. Turn on clothes
dryers and any appliance not connected to the
common venting system. Turn on any exhaust
fans, such as range-hoods and bathroom
exhausts, so they will operate at maxi mum
speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
4. Place in operation the appliance being
inspected. Follow the Lighting (or Operating)
Instructions. Adjust thermo stat so appliance
will operate continuously.
5. Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use
the flame of a match or candle, or smoke from
a cigarette, cigar or pipe.
35
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