LAARS MAX 165 (DV) - Installation, Operation and Maintenance Instructions - Manual (Page 7)

MAX Oil-Fired Boiler Page 7
On Carlin EZ-1 burners install model # 97406
combustion air intake system.
3G. Ventilation Air
(conventional chimney and
direct vent)
Where the boiler is installed in a basement there
is normally sufficient air infiltration to provide
adequate ventilation.
Where the boiler is installed in a closet or
otherwise confined space ventilation must be provided
to keep the controls from overheating. This is
accomplished by providing two openings to the space,
one 6" (152mm) from the floor and one 6" (152mm)
from the ceiling.
3H. Chimney Connection
Caution
An oil-fired unit shall be connected to a vent having
sufficient draft at all times to ensure sfe and proper
operation of the unit.
The chimney must be inspected and thoroughly
cleaned before connecting boiler. Most local codes
require the chimney to be lined when using an oil fired
boiler in order to protect the bricks and mortar from the
condensation produced by modern high efficient boilers.
The chimney must terminate at least 3 ft. (0.9m)
above the point where it passes through the roof and
be in a position free from down draft.
The boiler should be connected to the chimney
with the shortest possible run of 5 in. flue pipe and be
located above the chimney base to allow a drop leg for
scale accumulation to avoid blocking flue pipe
entrance.
Horizontal runs should be pitched up towards
chimney at approximately 1/4 inch per foot.
Install balanced damper on chimneys higher than
20 feet (6.1m).
Install "Blocked Vent Switch" provided in
accordance with attached instructions. Follow all
Warnings, Cautions and Maintenance Instructions for
safe, trouble free operation.
IMPORTANT: Max 75-140 may condense
when vented into an outside chimney. To minimize
potential for condensing, install either thermostatic
union or recirc bypass, shown in
Figures 12 and 13 .
As the boiler and flue pipe are under slight
positive pressure on start-up, it is necessary to seal all
pipe joints with high temperature tape or silicone
sealant to avoid any flue gas leakage into room.
Gas Flue Discharge
Flange Fix to Wall
5" diameter flue pipe -
secure both ends of
pipe with clamps and
seal with silicone
Oil Burner
Burner Intake Air
& Adaptor
4" diameter air pipe - secure
both ends
with clamps
4" pipe adapter
Balanced Flue Terminal
Air Intake Screen
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П
Figure 3. Direct Vent Balanced Flue System.
10" max.
6½"