DHW Demand
DHW
186°F
156°F
Target = 186°F
Ion-ic
Fig. 3 - All Combustion Air from Outdoors Through
Ventilated Attic
DHW Demand
DHW
186°F
156°F
Target = 186°F
Ion-ic
Fig. 4 - All Combustion Air from Outdoors Through
Horizontal Ducts
Gas Vent
Gas Vent
Outlet air
Inlet air duct
(ends 1ft (30 cm)
above oor)
Ventilation louvers
(each end of the attic)
Outlet air duct
Inlet air duct
8
CHAPTER 2
CHAPTER 2 - COMBUSTION AIR & VENTING
• Two Permanent Opening Method. Two permanent
openings, one commencing within 12 in. of the top
and one commencing within 12 in. of the bottom
of the enclosure, shall be provided. The openings
shall communicate directly, or by ducts, 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 through vertical ducts, each opening shall
have a minimum free area 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
through horizontal ducts, each opening shall have
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 in-
terior spaces shall comply with Section 2.4.1 on page 7.
Outdoor Opening(s) Location. Outdoor opening(s) shall
be located in accordance with Section 2.4.2 on page 7.
Outdoor Opening(s) Size. Outdoor opening(s) shall be
calculated in accordance with the following:
• The ratio of the interior spaces shall be the avail-
able 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) calculat-
ed in accordance with the above outdoor air chap-
ter multiplied by the reduction factor. The mini-
mum 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 conden-
sate.
The INSTINCT is certied as a Category IV or Direct Vent
(sealed combustion) appliance. A Category IV appliance
utilizes uncontaminated indoor or outdoor air surround-
ing the appliance for combustion. A Direct Vent appli-
ance utilizes uncontaminated outdoor air piped directly
to the appliance for combustion.
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.
It is essential that the supply of air for com-
bustion is not blocked or restricted - this
could result in serious injury, or death.
DANGER
DANGER
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