Combustion And Ventilation Air Supply; Requirements For Unconfined Spaces; Requirements For Confined Spaces - Giant UG30 Owner's Manual Installation And Operating Instructions

INSTALLATION INSTRUCTIONS

Combustion and Ventilation Air Supply

In order for the water heater to operate properly, it
must be supplied with an uninterrupted flow of clean
combustion and ventilation air. The area around the
water heater must always be kept clear and the
combustion air intake holes at the bottom of the
water heater must never be blocked. An inadequate
supply of air to the water heater will produce a
bright yellow burner flame causing sooting in the
combustion chamber, on the burner, and in the flue
tube. This can result in damage to the water heater
and serious bodily injury, if not corrected.
Combustion and ventilation air requirements are
determined by where the water heater will be located.
Water heaters are installed in either open (unconfined)
spaces or smaller (confined) spaces, such as closets
or small rooms.
Figure 2
Gas vent to
outdoors

Requirements for Unconfined Spaces

An unconfined space is an area with at least fifty
(50) cubic feet for each 1,000 Btuh (4.8 m/kW) of
the total input rating for all gas appliances installed
in that space. Water heaters installed in unconfined
spaces do not usually require outdoor air to function
properly. However, in buildings with tight construction
(heavy insulation, vapour barriers, weather stripping,
etc.), and particularly in modern buildings, additional
fresh air may need to be provided. For instructions on
obtaining additional air supply, see the requirements
below for confined spaces.
Évacuation de gaz
vers l'extérieur

Requirements for Confined Spaces

A confined space is an area where the volume is
less then fifty (50) cubic feet for each 1,000 Btuh
(4.8 m³/kW) of the total input rating for all gas
appliances installed in that space. Water heaters
installed in confined spaces require additional
combustion and ventilation air. This can be provided
in two ways:
Confined Space
Permanent
Opening
--------------
1 square inch /
1,000 Btuh
(min.: 100 sq. in)
Espace Restreint
Ouverture
Permanente
--------------
1 pouce carré / 5
1 000 BTUH
2
(min. : 100 po )
In Canada refer to CSA B149.1 and local codes for
detailed information.
1) The enclosure in which the water heater is installed
shall be provided with two (2) permanent openings
of one (1) square inch per 1,000 Btuh (22.0 cm²/
kW) of the total input of all appliances and shall
communicate directly with one or more rooms of
sufficient volume, so that the combined volume of all
spaces meets the criteria for an unconfined space
for all the appliances installed in that enclosure.
One opening shall be located not more than
eighteen (18) inches (45.7 cm) or less than six (6)
inches (15.2 cm) above the floor level. The second
shall be located as near the ceiling as practical, but
in no case lower than the draft hood.
2) All Air from Outdoors (see Figure 3):
An air supply shall be provided with one opening
that communicates directly with the outdoors by
means of a duct. This duct shall be sized according
Gas vent to
outdoors
to CSA B149.1 and terminate within one (1) foot
(30.5 cm) above, and within two (2) feet (61 cm)
horizontally from the burner level of the appliance
having the largest input.
Confined Space
Figure 3
Alternate
air inlet
Confined Space
1 sq. in / 4,000 Btuh
Inlet air duct
18'' (45 cm)
24'' (60 cm)
In U.S.A. (refer to ANSI Z223.1/NFPA 54 and local
codes for detailed information.
1) All Air From Inside the Building (see Figure 2):
The confined space shall be provided with two
(2) permanent openings communicating directly with
one or more rooms of sufficient volume, so that the
Évacuation de gaz
vers l'extérieur
combined volume of all spaces meets the criteria
for an unconfined space. The total input rating of
all gas appliances installed in the combined space
shall be considered in making this determination.
Each opening shall have a minimum free area of
Espace Restreint
one (1) square inch per 1,000 Btuh (22.0 cm/kW)
of the total input rating of all gas appliances in the
confined space, but not less than one hundred
Entrée d'air
Alternative
Attic air inlet
Install above
insulation
Outlet air to attic
1 sq. in / 4,000 Btuh
Inlet air from the
crawl space
Open foundation vent
Entrée d'air
du grenier
Installez au-dessus
de l'isolation
Sortie d'air
au grenier
2
1 po / 4 000 BTUH
Entrée d'air du
sous-sol