OO-A-373D
3.8.3 Condensing section.
3.8.3.1 Air-cooled condensers for type SP-A and SPY-A. Unless otherwise specified (see 6.2), air-cooled condensers shall be finned tube construction consisting of seamless copper or aluminum tubes with copper or aluminum fins. Fins shall be bonded to tubes and installed in a
metal casing. Coils, fittings, and joints shall meet the requirements for pressures of the refrigerant employed in the system and be in accordance with the referenced standards in ARI 210/240 or ARI 360 as applicable. When specified (see 6.2), for units 135,000 Btu/hr (39 565 W) and over the condensers coils shall provide not less than 10 degrees Fahrenheit ( F) (- 12 degrees Celsius
( C)) liquid subcooling.
3.8.3.2 Water-cooled condensers for type SP-W. Unless otherwise specified (see 6.2), water- cooled condensers shall be shell and tube, shell and coil, or concentric tube consisting of nonferrous metal may be used in the shell and tube exchanger. Soft solder containing tin shall not be permitted in the construction of the water circuit. The capacity rating of the condenser shall include a waterside fouling factor of not greater than 0.001 per Btu/hr per square foot per degree Fahrenheit (watt per square metre kelvin). Quality of water available for cooling (hardness, total dissolved solids and pH) shall be specified (see 6.2). A condenser water regulating valve shall be provided. The condenser shell shall be designed in accordance with referenced standards in
ARI 210/240 and ARI 360 as applicable. Provisions shall be made for venting and completely draining the water side. When specified (see 6.2), for units 135,000 Btu/hr (39 565 W) and over, the condenser coils shall provide not less than 10 F (- 12 C) liquid subcooling at standard rating.
3.8.4 Condenser-receiver or receiver. The condenser-receiver shall have sufficient capacity to receive the charge (see 3.9 and 3.9.1). For units over 135,000 Btu/hr (39 565 W) and when the temperature of the refrigerant is 90 F (32 C) and higher, the liquid shall not occupy more than
80 percent of the volume of the vessel.
3.8.5 Cooling (evaporator) coil. The cooling coil shall be finned tube construction, consisting of nonferrous metal tubes and nonferrous metal fins bonded to the tubing. Fittings and joints shall be brazed or welded. When specified (see 6.2 and 6.1.7), cooling coil shall be all copper or all aluminum.
3.8.6 Heating. Type SPY-A units shall be provided with a steam or hot water heating coil or gas heating, or an electric open coil, strip tubular, or fin tubular heater as specified (see 6.1.3 and 6.2). Electric tubular heaters shall have alloy sheaths, or sheaths treated to prevent corrosion. Steam or hot water heating coils shall be finned tube construction consisting of nonferrous metal fins securely bonded to the tubing and designed to withstand not less than 100 pound-force per square inch gage (psig) (689 kPa (gage)) at 400 F (204 C) for steam and 100 psig (689 kPa (gage)) at
220 F (104 C) for hot water. Electric and gas heaters shall conform to the requirements of the reference standards in ARI 210/240 or ARI 360 as applicable except that safety requirements for heating functions as prescribed in ARI 210/240 and ARI 360 shall be mandatory instead of highly recommended. Acceptable evidence that electric heaters meet the reference standards shall be the American Gas Association Laboratories certification seal on the unit as a whole, not just the
heater section. Gas heaters shall be indirect type, positive venting and shall have electric spark
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