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LAARS HEATING SYSTEMS
Figure 2. Suggested vent terminal installations.
SECTION 2.
Locating and Clearances
2A. Locating the 9600 HWG
The appliance should be located in an area where
leakage of any connections will not result in damage
to the area adjacent to the appliance or to lower floors
of the structure.
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The unit is design certified by AGA / CGA for
installation on combustible flooring; in basements; in
closets, utility rooms or alcoves. It must not be
installed on carpeting.
The location for the unit should be chosen with
regard to the vent pipe lengths, external plumbing,
ventilation of operating components and accessibility
for service and cleaning.
If there is potential for snow accumulation in your
area, both the vent terminals should be installed at an
appropriate level above grade (see Figures 2 and 3).
The following dimensions and requirements
should be met when choosing the location for the unit
(see Table 1):
Minimum
Recommended
Clearances
Clearance for
From
Accessibility
Combustible
and Venting
Construction
BOTH
AGA CGA
Left Side
1"
6"
48"
Right Side (Controls)
1"
12"
24"
Top
1"
14"
24"
Back
1"
9"
24"
Front
1"
24"
48"
Vent
0"
Table 1. Location clearances.
Figure 3. Alternate vent terminal installations.
2B. Locating the Unit for Proper Venting
Distance from the Outside Wall or
Roof Termination
Intake
Exhaust
Maximum run:
Maximum run:
3" pipe size
3" pipe size
55 equivalent feet
55 equivalent feet
4" pipe size
4" pipe size
85 equivalent feet
85 equivalent feet
Minimum run:
Minimum run:
11 equivalent feet
21½ 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 be installed to the actual linear feet of pipe
required.
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 unit fittings. 4"
inlet and exhaust screens are provided for installation
in contractor provided 4" coupling and elbow
terminations.
NOTE:
It is required that a minimum 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
not be installed above the exhaust terminal since this
would tend to pull exhaust gases back into the intake
(see Figures 2 and 3).
NOTE:
If flue passes through a flat
roof with parapet walls exhaust terminal
level must be above the level of the wall.
If flue passes through a sloped or
peaked roof it is not necessary to locate
it to conform with location requirements
for conventional chimneys.
Typical Soil Pipe
Flashing Acceptable
Exhaust
Terminal
Intake
Terminal
18"
Min.
Roof terminals for air
intake must prevent
entry of rain water.
Exhaust
Inside of
Exterior
Wall
24"
Min.
6"
Intake
12" Min.
Grade Level
