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SECTION 2
EDR-PURE-IOM-230608
5. For multiple boiler installations, multiply the number of boilers by required
net free area per boiler.
TABLE 6 MAKE UP AIR VENTILATION OPENINGS
Boiler Input
Two Openings Min. Net
Capacity
Free Area Each (SQFT)
(MBTU/HR)
750
1000
1500
2000
6. The net free area required for the boiler(s) is in addition to the combustion
or ventilation air supply requirements of other equipment sharing the
same space such as water heaters, generators, air compressors, or other
boilers. The boiler room must have an opening or openings not less than
the total net free area required for all types of equipment.
7. Consider the blocking e ects of louvers, grills, and screens on the net free
area of each opening. Ensure ventilation openings are unobstructed.
8. Where mechanical combustion air supply systems are used, such as a
combustion air supply fan or a motorized louver, they must be interlocked
with the boiler control panel to prove operation prior to burner ignition
and during burner operation. Where manual louvers are used, ensure they
are fully open prior to operating the boiler(s).
9. A 90˚ elbow is recommended on the air inlet to prevent debris falling into
the cabinet.
ƒ Combustion Air Ducted from the Outdoors
The combustion air supply may be ducted to the air inlet of the boiler.
Adhere to the following for installation:
1. An adapter (not supplied with boiler) may be required to connect the
boiler air inlet to the combustion air ducting/piping.
–
NOTE:
The weight of combustion air intake piping must not be supported by the
boiler. Ensure air intake piping is externally supported on hangers or straps.
2. The boiler room must not contain contaminated air.
3. The combustion air intake termination must be located as to not be
subjected to the intake/exhaust e ects of other mechanical equipment
such as other fuel- red heating equipment, loading docks, generators, air
handling systems, and cooling towers.
4. Ensure the boiler room air is maintained at a dew point temperature
below the temperature of the combustion air. Failure to provide adequate
ventilation or control dew point temperature may result in water or ice
build-up on the combustion air piping, leading to increased maintenance
or damage to boiler components.
5. Insulating the combustion air intake duct is not recommended.
6. The air intake system must be designed to prevent any moisture from
draining to the boiler. Slope the air intake duct down away from the boiler.
See Figure 24.
Questions? Please Contact Your Local Manufacturer's Representative
Low
High
1.3
1.3
1.8
1.8
2.6
2.6
3.5
3.5
Single Opening Only
Min. Net Free Area
(SQFT)
1.7
2.3
3.5
4.6
INSTALLATION
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4
CAUTION
Ensure there is not a negative pressure in the
boiler room. The boiler room pressure must
be neutral relative to the outdoors.
Particulate matter or chemicals (example:
chlorine, uorine, perchlorethylene,
halogenated compounds) in the
combustion air supply to the boiler will
cause damage or failure to the burner.
High-risk situations for particulate matter
to be in the air include construction and
maintenance activities. See Table 5.
2-25
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