Instinct Installation Manual

CHAPTER 2 - COMBUSTION AIR & VENTING
8
Gas Vent
Ventilation louvers
(each end of the attic)
Outlet air
Inlet air duct
(ends 1ft (30 cm)
above floor)
Fig. 3 - All Combustion Air from Outdoors Through
Ventilated Attic
Gas Vent
Fig. 4 - All Combustion Air from Outdoors Through
Horizontal Ducts
Inlet air duct
Outlet air duct
DHW
Ion-ic
186°F
DHW
156°F
• T w o P ermanent O p ening Method . T w o per manent
openings , one commencing within 12 in. of the t op
and one commencing within 12 in. of the bottom
of the enclosur e , shall be pr o vided . T he openings
shall communicat e dir ec tly , or b y duc ts , with the
outdoors or spaces that freely communicate with
the outdoors, as follows:
• Where directly communicating with the out-
doors or where communication to the outdoors
is thr ough v ertical duc ts , each opening shall
hav e a minimum fr ee ar ea of 1 sq . in./4000 Btu/
hr of total input rating of all equipment in the
enclosure. See Fig. 3 below.
• Where communicating with the outdoors is
thr ough hor iz ontal duc ts , each opening shall hav e
a minimum free area of not less than 1 sq.in./2000
Btu/hr of total input rating of all equipment in the
enclosure. See Fig. 4 below.
2.4.3 Combination of Indoor and Outdoor
Combustion Air
Indoor Openings. Where used, openings connecting the
interior spaces shall comply with
Section 2.4.1 on page 7 .
O
ut do or O pening(s) L o c ation . Outdoor opening(s) shall
be located in accordance with Section 2.4.2 on page 7 .
O
ut do or O pening(s) Siz e . Outdoor opening(s) shall be
calculated in accordance with the following:
• The ratio of the interior spaces shall be the available
volume of all communicating spaces divided by
the required volume.
• The outdoor size reduction factor shall be 1 minus
the ratio of interior spaces.
• The minimum size of outdoor opening(s) calculated
in accordance with the above outdoor air chapter
multiplied by the reduction factor. The minimum
dimension of air openings shall not be less than 3
in.
2.5. Combustion Air and Vent Piping
The INSTINCT requires a Category IV venting system,
which is designed for pressurized venting and
condensate.
The INSTINCT is certified as a Category IV or Direct
Vent (sealed combustion) appliance. A Category IV
appliance utilizes uncontaminated indoor or outdoor air
surrounding the appliance for combustion. A Direct Vent
appliance utilizes uncontaminated outdoor air piped
directly to the appliance for combustion.
DANGER
Do not install the INSTINCT into a common vent
with any other gas or oil appliances. This will
cause flue gas spillage or appliance malfunction,
which will result in substantial property damage,
serious injury, or death.
DANGER
It is essential that the supply of air for combustion
is not blocked or restricted - this could result in
serious injury, or death.
CHAPTER 2