6.7.8 Room Air System (indoor combustion air)
When using indoor air, Rinnai strongly recommends the use of an indoor air filter, P/N 808000025.
This boiler requires adequate combustion air for ventilation and dilution of flue gases. Failure to provide adequate combustion air can result in unit failure, fire, 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, fluorine 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 water heater.
Unconfined Space:
An unconfined space is defined 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 unconfined space." If the “unconfined 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 confined space.
25FT
36FT
Installation & Servicing Instructions Rinnai
NOTE: 8FT CEILING
Unconfined Space
91,300 BTU Boiler
Unconfined space
25FT
NOTE: 8FT CEILING
Unconfined Space
200,000 BTU Boiler
36FT
figure 16
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