LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 5)

SUMMIT BOILER OR WATER HEATER Page 5
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance shall be installed so that the gas
ignition system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation or service (circulator replacement, control
replacement, etc.).
The appliance is design certified by CSA-
International (AGA / CGA) for installation on
combustible flooring; in basements; in closets, utility
rooms or alcoves. SUMMIT Boilers or Water
Heaters must never be installed on carpeting.
The location for the appliance should be chosen
with regard to the vent pipe lengths and external
plumbing, If there is potential for snow accumulation
in the local area, both vent terminals should be
installed at an appropriate level above grade.
The following dimensions and requirements
should be met when choosing the locations for the
appliance:
Clearance from
Appliance Combustible Service Access
Surface Material Clearance
U. S./Canada U. S. Canada
Left Side 1" 2.5cm 6" 15cm 24" 61cm
Right Side 1" 2.5cm 12" 30cm 24" 61cm
Top 1" 2.5cm 14" 36cm 24" 61cm
Back 1" 2.5cm 9" 23cm 24" 61cm
Front 1" 2.5cm 24" 61cm 24" 61cm
Vent 0"
Table 1. Clearances.
NOTE: Roof terminations for air intake terminal
must prevent entry of rain water.
1.6 Locating Appliance for Correct Vent
Distance From Outside Wall or
Roof Termination
The forced draft combustion air blower in the
SUMMIT appliance has sufficient power to vent
properly when the following guidelines are followed.
Intake Exhaust
Maximum run: Maximum run:
3" pipe size 3" pipe size
55 equivalent feet 55 equivalent feet
4" pipe size 4" pipe size
105 equivalent feet 105 equivalent feet
Minimum run: Minimum run:
11½ equivalent feet 21 equivalent feet
Intake Terminal is Exhaust Terminal is
P/N 2400-102 P/N 2400-104
Equivalent feet is determined by adding 10
linear feet for each 90° elbow and 5 linear feet for
each 45° elbow to the actual linear feet of pipe
required to be installed.
Example: 8' of pipe, 2 x 45° elbows and a 90°
elbow.
Equivalent Feet: 8' + (2 x 5') + (1 x 10') = 28.
If a 4" pipe size is used to permit longer vent
runs the installer must supply 4" hubless couplings (2)
and 3 x 4 bushings (2) to adapt to the appliance
fittings. The supplied vent terminals may be used with
3" diameter pipes through the outside wall. Reducing
couplings should be located inside the outside wall to
increase to the 4" pipe size. A reducing coupling and
1' of 3" pipe must be considered as 5 equivalent feet.
NOTE: It is required that a minimum horizontal
separation of 18" be maintained between the intake
and exhaust terminals and that both terminals be
installed on the same wall of the building. The intake
terminal must be installed at an elevation 6" below the
exhaust terminal to prevent exhaust gases from
entering the intake.
1.7 Locating Appliance for Proper
Vent Height
The vent locations you select must permit direct
pipe runs to the terminal from the appliance. Since the
SUMMIT appliance is designed to drain any water
that collects in the vent, it is important that you do not
build any traps or low points into the vent where water
could collect and restrict the vent. It is recommended
that a pitch of ¼" per foot of vent be built into the
vent system to direct any water in the vent back
toward the appliance. Note that standard DWV
elbows have a built in allowance for the required ¼"
per foot pitch.
1.8 Locating Appliance with Respect
to Ventilation
While the SUMMIT appliance requires no
indoor air for combustion, adequate airflow around
the appliance must be provided for proper cooling of
electrical components.
1.9 Locating Appliance with Respect to
Storage Tank(s)
SMW-200/250 Water Heater
For best results the SMW-200/250 water heater
should be located within 10 feet of the storage tank(s).
If the appliance must be installed with longer
piping runs, then larger diameter pipe or tubing must
be used. Calculate the necessary pipe diameter for the
installation using Table 3.
1.10 Locating Appliance with Respect to
Return/Supply Header
SMB-200/250 Boiler
For the best results the SUMMIT SMB-200/250
Boiler should be located within 10 feet of the supply
and return headers.