Rinnai CU199i - Page 35

Rinnai Tankless Water Heater Installaon and Operaon Manual 35
Combuson air provided to the appliance should not be taken from any area of the structure that may produce a
negave pressure (i.e. exhaust fans, powered venlaon fans).
NOTICE
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION, COMMON VENTING WITH OTHER
MANUFACTURER’S INDUCED DRAFT APPLIANCES IS NOT ALLOWED.
□ Verify all combuson air opening sizes are correct.
□ Ensure that the Combuson Air Requirements are followed that will provide sucient combuson air for the
appliance.
□ DO NOT use room air for combuson in applicaons where the indoor air is corrosive.
□ Verify that adequate combuson air is available for all appliances installed in the space.
□ Installaon complies with Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54 as well as local and state
regulaons therein.
Checklist for Combuson Air and Venng Requirements
Locaon
To maintain proper circulaon of combuson air two permanent
openings (one upper, one lower) must be posioned in conned
spaces. The upper shall be within 12 in. (0.30 m) of the top of the
conned space and the lower opening shall be within 12 in. (0.30 m) of
the boom of the conned space. Openings must be posioned as to
never be obstructed.
Louvers and Grills
When sizing the permanent opening consideraon must be taken for the design of the louvers or grills to maintain the
required free area required for all gas ulizing equipment in the space. If the free area of the louver or grill design is
not available, assume wood louvers will have 25% free area and metal louvers or grills will have 75% free area. Under
no circumstance should the louver, grill or screen have openings smaller than 1/4 in.
Example: Wood: 10 in x 12 in x 0.25 = 30 in
2
Metal: 10 in x 12 in x 0.75 = 90 in
2
Non-Direct Vent (Room Air)
2
Combuson Air (Connued)
12 in.
(300 mm)
10 in.
(250 mm)