LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 6)

Page 6 LAARS Heating Systems
If the appliance must be installed with longer
piping runs, then the larger diameter tubing must be
used. Calculate the necessary pipe diameter for the
installation using Table 3.
SECTION 2.
Venting
Whenever possible, locations under windows or
near doors should be avoided. Because the SUMMIT
is a condensing appliance, steaming at the flue
terminal is a normal occurrence and it should be
considered when deciding flue terminal location.
2.1.2 Intake Terminal Location
The intake pipe and terminal require a separate
4" diameter hole to install the intake fitting. The
centerline of the hole should be at least 16½" above
grade outdoors and 18" away horizontally from the
exhaust outlet. The intake should never be located
above the exhaust terminal.
Figure 3. Suggested Vent Terminal Installations.
Figure 4. Alternate Vent Terminal Installations.
2.1 Locating Vent Openings On
Outside Wall
2.1.1 Exhaust Terminal Location
The exhaust pipe and terminal fitting require a
4" diameter hole through the outside wall. The
centerline of this opening must be at least 18" above
grade and at least 14" (3' in Canada) from any other
building opening such as doors, windows, etc.
Vent opening should be well away from
shrubbery or other obstructions that would block or
restrict the exhaust.
Figure 5. Multiple Units Minimum Vent Terminal
Separation.
2.2 Installing Vent Piping / Terminals
The appliance is provided with intake and
exhaust terminals for use with 3" diameter plastic
pipe. If AL29-4C stainless steel venting materials that
comply with UL 1738 Standard are used, the terminals
for that system shall be used and supplied by the
installer.
The installer is responsible for obtaining the vent
pipe and fittings. The maximum combined length of
the intake and exhaust pipe and maximum number of
elbows are determined by using the guidelines in
Section 1.6.
The following steps are recommended for vent
installation of Approved plastic venting: For
installation of approved stainless steel venting
systems, follow the venting system suppliers
instructions.
1. Obtain the necessary 3" or 4" diameter plastic
piping and fittings as determined beforehand.
2. Position appliance at previously selected
location.
3. Unpack vent terminals and vent terminal backing
plates located in the box on top of appliance.
4. Cut holes in outside wall for vent terminals in
previously selected locations.
5. Mount the vent terminals backing plates.
6. Fit all of the vent pipes together without
cementing. Make sure that there are no water
traps and that any pitch is inclined back towards
the appliance.
7. Make sure that the flexible vent connections at
the appliance fit properly.