SAFETY
KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
VENT PIPING
A. Vent piping installation must be in accordance with the require-
ments 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 posi-
tive pressure. Horizontal breeching or vent pipe should be as high
as possible, consistent with codes, so that vertical vents from appli-
ances will have a high rise above draft diverter openings. All hori-
zontal runs must slope upwards not less than 20 mm/m (1/4 inch
per foot) of run. Horizontal portions of the venting system must be
supported to prevent sagging by securing each joint with metal
screws and by providing hanger spaced no greater than 1524 mm
(5 feet apart).
D. Vent or breeching into chimney should not be inserted past the
inside wall of the chimney liner.
E. All venting means should be inspected frequently. See Care and
Maintenance and separate User's Information Manual.
VENT DAMPER INSTALLATION
The vent damper referred to in the following instructions is
the Slant/Fin LTD/LTEE vent damper.
I. This device is design certified by C.S.A. for use ONLY on specific
Slant/Fin gas boiler models. These boilers must also be equipped
with a plate which states that the boiler must or may be used with
a Slant/Fin automatic vent damper device and indicates the prop-
er vent damper model number. This device cannot be used with
a millivolt ignition system.
II. A. INSTALLATION INSTRUCTIONS BEFORE YOU START TO
INSTALL
1. Read this installation manual, the "DANGER" plate attached
to the top of the boiler, the "WARNING" on the wiring dia-
grams, vent damper carton and operator cover.
2. Perform pre-installation inspection as required by ANSI
specification Z21.66
or CSA B149.1latest edition for nat-
ural gas and propane
.
3. Turn off all electrical power, gas supply and wait for system to
cool (for previously installed boilers).
4. Carefully unpack the unit. DO NOT FORCE IT OPEN OR
CLOSED! Forcing the damper may damage the gear train
and void the warranty.
4Sentry
CHIMNEY REQUIREMENTS
A. Sentry boilers may be vented into a masonry vitreous tile-lined
chimney or type “B” venting system NOT EXPOSED to the OUT-
DOORS 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 Sentry 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 build-
ing codes and other authorities having jurisdiction apply.
B. If an existing boiler is removed from a common venting system,
the common venting system may be too large for proper venting
of the remaining appliances connected to the common vent. Fol-
low the test procedure shown in Appendix “A” on page 19 of this
manual to insure proper operation of venting system and appli-
ances.
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.
MINIMUM CLEARANCES FOR COMBUSTIBLE
CONSTRUCTIONS
* Allow extra clearance from combustibles for additional venting
A. Minimum boiler clearances shall be as follows:
B. Provide accessibility clearance of 510 mm (24”) on sides requir-
ing 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.
SENTRY SERIES
MINIMUM CLEARANCES FOR COMBUSTIBLE
CONSTRUCTION. MINIMUM ALCOVE AND CLOSET
CLEARANCE.
S-34 thru
S-150
Front 152 mm (6”)
Rear 152 mm (6”)
Left Side 152 mm (6”)
Right Side 305 mm (12”)
Top (above boiler) 305 mm (12”)*
Flue Connector 152 mm (6”)
WARNING—DANGER
Once you have begun vent damper installation procedure,
DO NOT restore electric power and gas supply until instal-
lation and inspection have been completed (in order to pre-
vent the main burners from operating). DO NOT operate
the boiler until the vent damper harness "FEMALE PLUG" is
plugged into "MALE PLUG" (as described in the installation
instructions), and the vent damper installation and check-
out procedures have been completed. Failure to observe
this warning may create a hazardous condition that could
cause an explosion or carbon monoxide poisoning.
