Instruction manual

18
A INSTALLATION INSTRUCTIONS
N = This position shall be respected
O = Discharge grid
P = Intake grid
4.2 Split Flue
The split flue vent system (two separate
pipes) can be extended (on the discharge
side only) up to a total length of 20 ft (6 m).
Changes in direction can be obtained by
using 90° and 45° elbows. If they are
installed, there will be a loss of draught equal
to 3ft (1 m) and 1 1/2ft (0.5 m) of straight
pipe, respectively. This is valid only for pipes
and elbows manufactured by Cosmogas
s.r.l..
If the heater is installed in a large open area
such as a full basement or alcove, the
combustion air could also be supplied without
the intake pipe, (For model BMS see figures
8, 11, 12, 13 and 14 or for model BTS see
figures 16, 18, 19 and 20 for model BTS).
NOTE: The heater will draw all air for
combustion through the top of the unit from
the space around the heater. Ventilation
should be adequate to provide sufficient air
to properly support combustion. Air for
combustion and room ventilation must be
obtained from spaces freely communicating
with the outdoors. Air openings to the room
should not be obstructed.
For heaters in confined rooms, two
permanent openings must be provided - one
within 12 of the ceiling and one within 12 of
the floor. Each opening must be at least one
square inch per 1,000 BTU/H heater input,
but not less than 100 square inches. These
openings must freely connect with areas
having adequate infiltration to the outside.
When all air provided is supplied from the
outdoors, the openings, as described above,
shall be of the size listed below for each
particular arrangement:
- All ducting shall be the same size as the
opening which it is to be connected.
- One square inch of free area per 4,000 BTU/
H of heater input for direct outdoor air supply
through an outside wall or vertical duct directly
outside.
- One square inch of free area for every 2,000
BTU/H of heater input for direct outdoor air
through horizontal ducting.
Caution!
The discharge pipe temperature is above
250°F while functioning, therefore it is
essential that a thermal insulation
protection sheath be used in the wall
opening.
4.3 Chimney Venting
If split type vent will be venting into a chimney,
make certain that no other appliances are
vented into it. This power-vented heater must
not share a chimney. Vent exhaust terminal
should be inserted into, but not beyond, inner
wall of chimney.
Do not vent into transient pipe. Warranty
will be void.
4.5 Venting Locations - Outside
Walls (Direct Venting)
The center line of the vent opening must be
at least 16 1/2 above grade, outside, and at
least 12 from any other building openings
(doors, windows, etc.).
Make sure that vent pipe is pitcheed down
from the unit toward the outside wall 1/4 per
foot. This will prevent any water from running
back into the heater.
Do not locate the vent terminal where flue
products could strike against building
materials and cause corrosion.
4.6 Kit for air intake/flue
discharge
For comfort for the installer, COSMOGAS
has created some flue kit, complete of all
the necessary components for flue
discharge and air intake. The four kits
available are as follows: