OO-A-373D
igniter with safety pilot or hot surface ignition and limited switches. The combustion chambers and heat exchangers shall be corrosion-resistant. The seams shall be gas-tight. The average heat transfer rate shall be not greater than the allowable heating element temperature rise specified in the referenced standards of ARI 210/240 or ARI 360 as applicable. Heaters shall be an integral part of the unit.
3.8.7 Condensate disposal pan and drain. Condensate disposal pan shall be provided under the evaporator. Drains shall be provided from the pan where means are not available for complete condensate disposal into the air stream. The pan shall either be constructed of corrosion-resistant material, or coated with not less than 0.0625-inch (1.5875 mm) thick waterproof corrosion- resistant material, or made of reinforced plastic of not less than 0.125-inch (3.175 mm) thick.
3.8.8 Fans and blowers. For outdoor units less than 135,000 Btu/hr (39 565 W), propeller fans, centrifugal blowers, and compressors shall have a Noise Rating (NRARI) not greater than 8.8 as rated in accordance with ARI 270. Acceptable evidence of meeting this rating shall be the ARI certification symbol and a listing in ARI Directory of Certified Sound-Rated Outdoor Unitary Equipment. Air flow ratings shall be established in accordance with ARI 210/240 or ARI 360 as applicable. Fans and blowers shall be adequately secured to shafts. Bearings shall be self-oiling with adequate oil reservoirs or permanent life-lubricated ball bearings. Oil or grease fittings,
when used, shall be readily accessible upon removal of the service panel. When the fan or blower is belt driven, the motor shall be provided with an adjustable base and guard conforming to
OSHA 1910.219 or enclosed in the unit casing. Where the fan or blower motor is exposed to condensate drip, proper protection shall be provided. The direction of rotation shall be clearly and permanently marked on each fan and fan housing. All centrifugal blowers shall be statically and dynamically balanced, and shall be supported by not less than two self-aligning bearings.
3.8.8.1 Condenser fans or blowers. Condenser fan shall be the propeller type or centrifugal blower type at the option of the contractor, except blowers shall be used for air conditioners requiring duct connections for supplying outside air to cool the condenser. Propeller fans shall be designed for low tip speed. Condenser blowers for duct connections shall be designed to operate against a static pressure as specified (see 6.2).
3.8.8.2 Evaporator blowers. Evaporator blower(s) shall be the centrifugal type.
3.8.9 Drier and strainer. When specified (see 6.2), a filter drier shall be provided in the liquid line. A strainer shall be installed in the refrigerating circuit.
3.8.10 Air filters. Unless otherwise specified (see 6.2), air filters shall be provided and arranged to filter all ventilation or recirculation air before its entrance into the evaporator-blower unit. Unless otherwise specified (see 6.2), filters shall conform to the requirements of ASTM F 1040. The direction of air flow shall be clearly and permanently marked on the filter frame.
3.8.11 Crankcase heaters. When specified (see 6.2), means shall be provided for heating the compressor crankcase during "OFF" cycles for all units to minimize liquid foaming, and prevent consequent liquid slugging under compressor starting conditions caused by retention of refrigerant
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