Raypak 0180B Type H Installation And Operating Instructions Manual

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83. Except for carpeted flooring, boilers are certifiedfor installation on combustible floors.4. For un-insulated hot water pipes, maintain a 2"clearance, or consult local authority having juris-diction.Combustion/Ventilation Air1. The boiler must be provided with adequate supplyof air for proper combustion and ventilation inaccordance with the latest edition of the NationalFuel Gas Code, ANSI Z223.1, or applicable provi-sions of the local building codes.2. Models 0042 and 0066 only: When the boiler isinstalled in a confined space such as a utility roomor closet where all air is supplied from inside thebuilding, the boiler room must be provided withtwo openings, each one having a minimum netfree area, in square inches as shown in Table C.WARNING: Air supply to the boiler room must notbe affected by mechanical exhaust vents located inother parts of the house, such as kitchen orbathroom fans, or attic blowers. Mechanical exhaustvents may create a negative pressure condition inthe boiler room that can become a hazard ofasphyxiation, explosion or fire.CAUTION: Combustion air must not becontaminated by corrosive chemical fumes whichcan damage the boiler. Measures must be taken toprevent the entry of corrosive chemical fumes to thecombustion and ventilation air supply. Suchchemicals include, but are not limited to, chlorinatedand/or fluorinated hydrocarbons such as found inrefrigerants, aerosol propellants, drycleaning fluids,degreasers, and paint removers. Other harmfulelements may come from bleaches, air fresheners,or mastics. Vapors from these types of products canform corrosive acid compounds when burned in agas flame. The resulting acid condensate candamage or substantially reduce the life of the heater.It may be necessary to provide outside air directly tothe heater in order to avoid this problem.One opening shall be within 12" of the top, and theother opening within 12" of the floor. If additional gasappliances are installed in the same space, the totalinput of all gas appliances installed in the same space,must be considered in the calculation. Refer to Sec.5.3.5 of the latest edition of the National Fuel GasCode for additional requirements.3. If the boiler room is located against an outside walland air openings can communicate directly with theoutdoors, the two openings on the outside wall musteach have a net free area as shown in Table D.Model No. Sq. in. of Free Area00420066 70Table C: Minimum Net Free AreaNOTE: If louvers, grills or screens are used on theopenings, obtain the net free area requirements fromtheir supplier or manufacturer. If the design free areaof a louver is not known nor available, it shall beassumed that wood louvers will have 20-25 percentfree area and metal louvers will have 60-75 percentfree area as shown in Sec. 5.3.5 National Fuel GasCode.Model No. Sq. in. of Free Area0042 120066 180090 240135 350180 45Table D: Minimum Net Free AreaFig. 3: Location of Openings forCombustion/Ventilation Air