MINIMUM CLEARANCES FOR COMBUSTIBLE
CONSTRUCTIONS
A. Minimum boiler clearances shall be as follows:
B. Provide accessibility clearance of 510 mm (24”) on sides
requiring servicing and 457 mm (18”) on sides used for
passage.
C. All minimum clearances shown above must be met. This
may result in increased values of some minimum clearances
in order to maintain the minimum clearances of others.
D. Clearance from hot water pipes shall be 25 mm (1 inch)**.
** At points where hot water pipes emerge from a floor, wall or ceiling, the
clearance at the opening through the finished floor, wall or ceiling boards
may not be less than 13 mm (1/2 inch). Each such opening shall be
covered with a plate of non-combustible material.
SAFETY
KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
DRAFT HOOD
The draft hood supplied with SE models is part of the listed boil-
er assembly. DO NOT alter the hood. See dimensions, page 2.
Attach the hood to the boiler flue outlet. Connect flue pipe full
size of hood outlet. Vent damper must be installed on the outlet
side of the hood. See Vent Piping, below.
VENT PIPING
A. Vent piping installation must be in accordance with the
requirements of the local gas utility, local building codes and
other authorities having jurisdiction.
B. Boiler vent pipe must be the full diameter of the boiler outlet.
See dimensions, page 2.
C. If more than one appliance vents into a common breeching,
the area of the breeching must be equal to the area of the
largest vent plus 50% of the area of the additional vent areas.
Vent connectors serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure. Horizontal
breeching or vent pipe should be as high as possible, con-
sistent with codes, so that vertical vents from appliances will
have a high rise above draft diverter openings. All horizontal
runs must slope upwards not less than 20 mm/m (1/4 inch
per foot) of run. Horizontal portions of the venting system
4Sentinel
CHIMNEY REQUIREMENTS
A. Sentinel boilers may be vented into a masonry vitreous tile-
lined chimney or type “B” venting system NOT EXPOSED to
the OUTDOORS below the roof line.
Venting and sizing of venting system must be in accordance
with the requirements of the local gas utility, local building
codes and other authorities having jurisdiction.
If a masonry chimney is exposed to the outdoors on one or
more sides below the roof line (exterior chimney), ONE of
the following options apply:
1. Chimney must be re-lined with an approved metallic liner.
When this is done, the chimney will be considered NOT
exposed to the outdoors and the requirements for NON-
exposed chimneys and/or local codes will apply.
2. If an exposed tile-lined chimney is to be used WITHOUT a
metallic liner, the boiler must first meet the requirements
of the following tables and paragraphs of the National
Fuel Gas Code:
I. For Single Sentinel Boiler—Paragraph 11.2.9 and
table 11.11.
II. For multiple appliances—Paragraph 11.3.18 and table
11.12 (or 11.13 if applicable).
In addition, all requirements of the local gas utility, local
building codes and other authorities having jurisdiction
apply.
B. If an existing boiler is removed from a common venting sys-
tem, the common venting system may be too large for prop-
er venting of the remaining appliances connected to the
common vent. Follow the test procedure shown in Appendix
“A” on page 15 of this manual to insure proper operation of
venting system and appliances.
C. Inspect for proper and tight construction. Any restrictions or
obstructions must be removed. An existing chimney may
require cleaning.
D. Chimney or vent must extend at least 914 mm (3 feet) above
any ridge within 3048 mm(10 feet) of the chimney.
WARNING
LIQUEFIED PETROLEUM (L.P.) PROPANE
GAS-FIRED BOILER LOCATION
REQUIRES SPECIAL ATTENTION
Liquefied Petroleum (L.P.) propane gas is heavier than air.
Therefore, propane boilers, piping, valves must NOT be
installed in locations where propane leaking from defective
equipment and piping will “pool” in a basement or other
space below the leak.
A spark or flame from the boiler or other source may ignite
the accumulated propane gas causing an explosion or fire.
Provide a level, solid foundation for the boiler. Location
should be as near the chimney as possible so that the flue
pipe from boiler to chimney is short and direct.
The UNIFORM MECHANICAL CODE may be in effect in
your geographic area
The following precautions are cited by the 1994 UNIFORM
MECHANICAL CODE, section 304.6 or CSA B149.00 for
natural gas and propane:
“LPG Appliances. Liquefied petroleum gas-burning
appliances shall not be installed in a pit, basement or
similar location where heavier-than-air-gas might collect.
Appliances so fueled shall not be installed in an above-
grade under-floor space or basement unless such loca-
tion is provided with an approved means for removal of
unburned gas.”
Consult Chapter 5 of the 1994 UNIFORM MECHANICAL
CODE or CSA B149.00 for natural gas and propane for
design criteria of the “approved” means for removal of
unburned gas.
SENTINEL SERIES
MINIMUM CLEARANCES FOR COMBUSTIBLE
CONSTRUCTION. MINIMUM ALCOVE AND CLOSET
CLEARANCE.
Front 152 mm (6”)
Rear 152 mm (6”)
Left Side 152 mm (6”)
Right Side 305 mm (12”)
Top (above boiler) 711 mm (28”)
Flue Connector 152 mm (6”)