LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 10)

Page 10 LAARS Heating Systems
SECTION 3.
Venting and Air Source
3A. The Direct Vent Kits
(part numbers 2400-326 or 2400-328)
When using the Direct Vent Kit, the H Series 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.
3B. Installing Direct Vent Kits
The Direct Vent H Series 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' extensions are available to
increase vent lengths to the maximum 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.
3C. 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, windows, 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).
(see Figure 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 horizontally 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 building materials and cause degradation.
3D. Air Source For Combustion
(when not direct vented)
When using these venting methods the H Series
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 unusually 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.
INTAKE AIR
SCREEN
PLUG
5" TEE
3" VENT
4" MIN. DIA
H, HP or HW with
Separate Air
Source.
ALTERNATE TO 1. - 3. ABOVE
Figure 11. H, HP or HW with Separate Air Source.
8" MIN.
Figure 10. Direct Vent Terminal Clearance.
OUT OF
PRODUCTION