Installation Guide

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6.5.2 Consideration for Installation 6.5.3 Combustion Air
NOTE
Provide adequate combustion air so
as to not create negative pressure
within the building.
• When installing this Water Heater in an
area with a large amount of lint such as a
commercial Laundromat, direct vent (“-DV”)
system must be used.
The “-SV” configuration (using SV conversion
kit) is prohibited.
• When installing this Water Heater in a mobile
home, all combustion must be drawn directly
from the outdoors.
The “-SV” configuration (using SV conversion
kit) is prohibited.
DANGER
• Supply combustion air to the Water Heater as per
the National Fuel Gas Code, ANSI Z223.1 - latest
edition and in Canada, in accordance with the
Natural Gas and Propane Installation Code CSA
B149.1 - latest edition.
• A minimum free area of each opening per unit:
• If the Water Heater is installed in a mechanical
closet, a minimum of permanent clearance of
4 in. or more in front of the Water Heater is
required. In order to facilitate maintenance and
repair, a minimum clearance (24 in. or more)
should be met.
• If combustion air will be provided through a duct,
size the duct to provide 70 cubic feet of fresh air
per minute per unit.
• Disconnect the electrical power and then turn ON
DIP switch #3 if combustion air will be supplied
from the indoors.
Refer to page 49 for the location of the DIP switch
bank and how to change the DIP switch.
Failure to perform this step will result a “73” code
displayed on the Remote Controller and a cease
in operation.
If this occurs, disconnect, then reconnect the
electrical power to the Water Heater to reset the
system.
• SV Conversion kit SV-CK-2 is required for the air
intake.
• Noritz recommends a carbon monoxide alarm
installed in same room space as Water Heater
when supplying combustion air from the indoors.
Here
To prevent possible personal injury or death
due to asphyxiation, common venting with
other manufacturer’s induced draft appliances
is not allowed.
WARNING
Failure to change DIP switch #3 and use SV
Conversion kit SV-CK-2 could result in a fire or
explosion causing property damage, personal
injury or death.
Refer to the instructions provided with the
conversion kit for additional details.
WARNING
H
H
W
W
Provide two
permanent
openings to allow
circulation of
combustion air.
Indoor make up
air is provided
200 in.²
example 20 in. (W) × 10 in. (H)
Outdoor
make
up air is
provided
Direct or Vertical ducts 50 in.²
example 10 in. (W) × 5 in. (H)
Horizontal ducts 100 in.²
example 20 in. (W) × 5 in. (H)
Venting the Water Heater