This specification covers single package type air conditioners designed for a large office space or space consisting of several rooms with cooling capacity range from 1 ton to 75 tons. A general guide to selection of types and classes are as follows:

Type SP-A air conditioners are generally specified where condenser cooling water and drain facilities are not available.

Type SP-W air conditioners can be used in areas where there is a cooling tower or readily available water supply and drain facilities.

Type SPY-A air conditioners can be specified when heating of the space to be conditioned is required. Where not water, gas, electricity or steam is available for heating, the appropriate type of heating coil or heat exchanger can be specified. Steam and hot water heating on outdoor rooftopmounted units are usually available in sizes 20-75 tons. Larger models and small models are usually available in gas or electric heat only. Indoor vertical self-contained units are usually available in 3-80 tons cooling capacity and have provisions for electric, steam, or hot water heating but not gas heating. For steam and hot water coils, the following information should be supplied:

a. Velocity of air across coil face, feet/minute (ft/min) (m/min) standard air.

b. Entering the dry-bulb temperature, °F (Celsius (°C)).

c. Water velocity range, ft/min (m/min) - hot water coil.

d. Entering water temperature, °F (°C), - hot water coil.

e. Steam pressure at coil, inlet, psi (kPa) - steam coil.

f. Maximum superheat in steam at coil inlet; °F (°C), steam coil.

Style A air conditioners can be specified where the conditioner can be discharged directly into the conditioned space. To accomplish this, the air conditioner must be located either within the conditioned space, adjacent to the space, or on the roof over the space.

Style B unit can be specified where duct work is necessary to supply the cooled air to conditioned space. The unit is usually located outside the conditioned space and duct work is required to deliver the cooled air to the conditioned space, or where the unit is located in a conditioned space and connected to other spaces by duct work.

Many applications of unitary air conditioners require ratings under conditions other than standard rating conditions of ARI 360 (see 3.6.1.5 and 6.10). The following information should be supplied by the acquisition authority to the contractor as indicated by the "X" in the applicable blocks.

Indoor air conditioner components made of ferrous metals located in marine atmosphere should withstand 125 hours of 100 percent relative humidity per ASTM D 2247. Outdoor components made of ferrous and nonferrous metals located in marine atmosphere should withstand 125 hours and in severe marine atmosphere 500 hours of salt per ASTM B 117 (see 3.14.1 and 3.14.2)

All air conditioning units rated less than 65,000 Btu/hr with air cooled condenser and single phase power unit input, the SEER applies and the minimum should be 8.0. Other units within the scope of this specification, the EER applies and the minimum EER should be 7.5.