Room Air System (Indoor Combustion Air) - Rinnai E75CN Installation & Servicing Instructions Manual

6.7.9 Room Air System (indoor combustion air)

25FT
NOTE: 8FT CEILING
Unconfi ned Space
91,300 BTU Boiler
Unconfined space
When using indoor air, Rinnai strongly recommends the use of an indoor air
fi lter, P/N 808000025.
This boiler requires adequate combustion air for ventilation and dilution of fl ue gases.
Failure to provide adequate combustion air can result in unit failure, fi re, explosion,
serious bodily injury or death. Use the following methods to ensure adequate
combustion air is available for correct and safe operation of this water heater.
Important: Combustion air must be free of corrosive chemicals. Do not provide
combustion air from corrosive environments. Appliance failure due to corrosive air is
not covered by warranty.
Combustion air must be free of acid forming chemical such as sulfur, fl uorine and
chlorine. These chemicals have been found to cause rapid damage and decay and
can become toxic when used as combustion air in gas appliances. Such chemicals
can be found in, but not limited to bleach, ammonia, cat litter, aerosol sprays, cleaning
solvents, varnish, paint and air fresheners. Do not store these products or similar
products in the vicinity of this boiler.
Unconfi ned Space:
An unconfi ned space is defi ned in NFPA #54 "as a space whose volume is not less
than 50 cubic feet per 1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input
rating of all appliances installed in that space. Rooms communicating directly with
the space in which the appliances are installed, through openings not furnished with
doors, are considered a part of the unconfi ned space." If the "unconfi ned space"
containing the appliance(s) is in a building with tight construction, outside air may
still be required for proper operation. Outside air openings should be sized the same
as for a confi ned space.
25FT
36FT
NOTE: 8FT CEILING
Unconfi ned Space
200,000 BTU Boiler
36FT
figure 19
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