INTAKE AIR
SCREEN
PLUG
5" TEE
3" VENT
4" MIN. DIA
THE DIRECT VENT KITS
(PART NUMBERS 2400-326 or 2400-328)
When using the Direct Vent Kit, the Heatmaker is a sealed
combustion unit. All of its air is drawn in from the outside
through the 5" outer pipe. Flue gases are vented through the
3" vent pipe positioned inside the 5" intake pipe. The hot flue
gases are surrounded by the intake flow of cooler outdoor air.
This vent system may be installed through, and be in contact
with, combustible materials.
INSTALLING DIRECT VENT KITS
The Direct Vent Heatmaker is certified with a maximum of 15
linear feet of vent pipe and one set of elbows. Systems may
be vented with a maximum of three sets of concentric elbows
providing the maximum length is reduced by three linear feet
for each additional elbow set. Provide a minimum of 16" above
the top of the boiler for vent installation and servicing. There
are two vent kits available. Part numbers 2400-326 and 2400-
328 provides all of the required materials. Part number
2400-326 for vent installations which require adjustable height
and horizontal run. This kit will permit vertical and horizontal
lengths of pipe from 2' or 4'. One foot extensions and 2' to 4'
extentions are available to increase vent lengths to the maxi-
mum allowed. Additional sets of elbows are also available.
Part number 2400-328 provides all of the required materials
for vent installations which may have a fixed height of 11
inches and an adjustable horizontal run of 2' - 4'. Accessories
for P/N 2400-326 also fit P/N 2400-328.
LOCATING THE VENT ON AN OUTSIDE
WALL
Exterior vent should terminate 16½" above grade, and at least
13 ½" from any other building opening such as doors, win-
dows, etc. Units terminating below the top of the boiler must
reduce allowable vent length by 1" for every foot of vertical drop
below the top.
Vent opening should be well away from shrubbery or other
obstructions that would prevent free air flow to and from vent
terminal. Do not terminate vent under decks, stairways, or car
ports. When ever possible, locations under windows should
be avoided.
NOTE: Should it be impossible to locate opening center line
16 ½" above grade, use optional Vent Terminal Extension
(Part Number 2400-278). Fig. 4.
Vent terminals must also be at least 3' above any forced air
inlet located within 10', and at least 7' above grade when
located adjacent to a public walkway, and cannot terminate in
a location where condensate or vapor may be a nuisance,
hazard, or could be a detriment to other equipment. Vent
terminals must have a minimum clearance of 4 feet horizon-
tally from, and in no case above or below electrical meters, gas
meters, regulators, and relief equipment unless a 4 foot
horizontal distance is maintained .
Do not locate the vent terminal where blockage by snow is a
possibility, or where flue products could strike against build-
ing materials and cause degradation.
AIR SOURCE FOR COMBUSTION
(WHEN NOT DIRECT VENTED)
When using these venting methods the Heatmaker draws all
combustion air through the top of the unit and from the space
around the boiler. When locating the unit in unconfined spaces
in buildings, infiltration may be adequate to provide air for
combustion and ventilation; however, in buildings of unusu-
ally tight construction, or when locating the unit in a confined
space, additional air should be provided and the following
guidelines must be followed.
1. If the space is in a building of unusually tight construction,
air should be obtained from outdoors, or from spaces which
freely connect with outdoors.
2. For boilers in confined rooms, two permanent openings
shall be provided - one within 12" of the ceiling, and one within
12" of the floor of each room. Each opening shall be at least
one square inch per 1,000 BTU/HR boiler input, but not be less
than 100 square inches. These openings shall freely connect
with areas having adequate infiltration from outside.
3. When all air is provided from outdoors, the confined
space shall be provided with two openings as outlined above.
These openings shall connect directly, or by ducts, with
outdoors or spaces (crawl or attic) that freely connect with the
outdoors, and shall be of the size listed below for that particu-
lar arrangement.
a. One square inch of free area per 4,000 BTU/HR of boiler
input for direct outdoor air supply through an outside wall,
or through vertical ducting directly to outside.
b. One square inch of free area per 2,000 BTU/HR of boiler
input for direct outdoor air through horizontal ducting.
c. All ducting shall be of the same size as the opening to
which it is connected.
H, HP or HW with
Separate Air
Source.
ALTERNATE TO 1. - 3. ABOVE
8
Figure 11.
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