Part Number 550-110-641/0605
3
PFG SerieS 7 GaS-Fired Water Boiler — Boiler Manual
Combustion air and ventilation openings
Combustion air and ventilation openings must comply with Sec-
tion 5.3, Air for Combustion and Ventilation, of National Fuel
Gas Code ANSI Z223.1-latest edition, or applicable local build-
ing codes. Canadian installations must comply with CAN/CSA
B149.1 or .2 Installation Codes.
Provide adequate combustion and ventilation air to:
• Ensure proper combustion
• Reduce risk or severe personal injury or
death from flue gas spillage and carbon
monoxide emissions.
Do not install an exhaust fan in the boiler room.
Boiler installation must ensure sufficient openings in building
and boiler room to provide adequate combustion air and ventila-
tion. Consider construction tightness of building when deciding
whether additional outside openings may be needed.
Older buildings with single-pane windows, minimal weather-
stripping and no vapor barrier often provide enough natural
infiltration and ventilation without dedicated openings.
New construction or remodeled buildings are most often built
tighter. Windows and doors are weather stripped, vapor barriers
are used and openings in walls are caulked. As a result, such tight
construction is unlikely to allow proper natural air infiltration
and ventilation.
Select the boiler location
• Consider all connections to boiler before selecting a location.
• Boiler must be installed so gas control system components are pro
-
tected from dripping or spraying water or rain during operation or
service.
• Non-combustible floor ONLY. See “Boiler foundation”, Page 5.
To avoid personal injury, death or property damage,
keep boiler area clear and free from combustible
materials, gasoline and other flammable vapors
and liquids.
Installation clearances
Suggested minimum clearances for servicing
• 24 inches for cleaning and servicing, left side.
• 18 inches for access to controls and components, front.
• 48 inches from top for cleaning flueways.
• 6 inches on remaining sides.
PFG-5 through PFG-7: Required minimum clearances
to combustible surface in alcove installations (see
below)
PFG 5 thru 7: Top 42” R. Side 5” Front: Alcove 18”
Rear 5” L. Side 5”
PFG-8: Required minimum clearances to combustible
surfacel in alcove installations
PFG 8: Provide minimum 24” between jacket and any com
-
bustible wall(s). Provide minimum 48” between jacket top and
combustible ceiling or surface above the boiler.
Install in a space large in comparison to size of boiler.
Clearances from piping materials to combustible sur-
faces
• Single wall vent pipe must be at least 6 inches from combustible
surface.
• Type “B” double wall metal vent pipe - refer to vent manufacturer’s
recommendation for clearances to combustible surface.
• Hot water pipes must be at least ½” from combustible surface.
Section I: Installation
Air from inside building (boiler in interior room):
• Tightly constructed buildings must be provided with openings to
outside for combustion and ventilation air. These openings must be
sized to handle all fuel burning appliances, exhaust and ventilation
fans and fireplaces.
• When openings to boiler room are taken to interior spaces, provide
two permanent openings: a combustion air opening within 12 inches
of floor and a ventilation opening within 12 inches of ceiling. Each
opening must provide a minimum free area of one square inch per
1,000 Btuh input of all appliances in room plus requirements for
any exhaust fans in room. The interior space supplying combustion
and ventilation air must have adequate infiltration from outside.
Air directly from outside to boiler room:
• Tightly constructed buildings must be provided with combustion
air and ventilation openings to boiler room which are adequate to
handle the boiler needs plus the needs of all other fuel-burning ap-
pliances, fireplaces and exhaust or ventilation fans.
• Combustion and ventilation openings connecting directly or by
ducting to outside, or to attic or crawl spaces that freely connect
with outside, must be sized as follows:
1. Outside wall or vertical ducting - one square inch per 4,000
Btuh input of all appliances in room plus requirements for any
exhaust fans or other appliances in room.
2. Horizontal ducting - one square inch per 2,000 Btuh of all appli
-
ances in room plus requirements for any exhaust fans or other
appliances in room.
3. All ducting must be same size as permanent openings. Minimum
size of ducting must be no less than 9 square inches.
4. Other size ducting must comply with local codes.
Note Minimum clearances from combustible
surfaces for models PFG-5 through PFG-7
