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Installation instructions
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
32
Fig. 23 Installation Recommendation for Placement of
Backdraft reducer
[1] Good
[2] Better
[3] Best
4.6.7 Single Pipe Venting
NOTICE:
▶ Single pipe venting not recommended in cold climates.
▶ Installations resulting in negative pressure/back draft
require sealed combustion (twin pipe / concentric).
Damage caused from back draft, ie. freezing, are not
covered by warranty.
NOTICE:
▶ When installed in an environment where corrosive
chemicals or dirty air (e.g. hair salons, car washes) are
present the sealed combustion (twin pipe or concentric) is
required.
Air combustion
WARNING:
Risk of CO poisoning!
The lack of adequate air openings may lead to improper
operation due to other appliances consuming required air.
▶ Always follow local codes and regulations of authority
having jurisdiction in case of single pipe installation in
confined spaces.
Although it is permissible to draw the air-intake from the inside,
it is not the manufacturer’s recommended installation method.
When drawing inside air, install a 90° elbow or air intake screen
on the top of the air-intake inlet adaptor to prevent foreign
objects from falling into the unit.
If a single pipe installation is utilized, follow guidelines below for
providing adequate combustion air for the water heater as well
as any other appliances that may consume air in the same
space. Always follow local codes and regulations of the
authority having jurisdiction.
• Appliances located in unconfined spaces:
– a) An unconfined space is one whose volume is greater
than 50 cubic feet (1.42 cubic meter) per 1000 BTU/
hr (292.81 Watts) of the combined rating of all
appliances installed in the space. That would be 9950
cubic feet (281.8 cubic meters) or 1243 square feet
with 8 foot ceiling, for a single 199 kBTU water heater.
– b) In unconfined spaces in buildings of conventional
frame, masonry, or metal construction, infiltration air is
normally adequate to provide air for combustion.
• Appliances located in confined spaces:
The confined space must be provided with two permanent
openings, one commencing within 12 inches (304.8mm)
of the top and one commencing within 12 inches
(304.8mm) of the bottom of the enclosure. Each opening
must have a minimum free area of one square inch per:
– 1000 BTU/hr (292.81 Watts) if all air is taken from
inside the building
– 2000 BTU/hr (585.62 Watts) if all air is taken from the
outside by horizontal ducts
– 4000 BTU/hr (1171.24 Watts)if all air is taken from
the outside by direct openings or vertical ducts
Or the confined space must be provided with one permanent
opening or duct that is within 12 inches (304.8mm) of the
ceiling of the enclosure. This opening must have a minimum
free area of one square inch per:
– 3000 BTU/hr (878.43 Watts) if all air is taken from the
outside by a direct opening or vertical duct.
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