OO-A-373D
by the oil in the compressor. Crankcase heaters shall be readily replaceable from the exterior without breaking the refrigerant seal. Internal crankcase heaters may use motor windings as heaters.
3.9 Refrigeration system. The refrigeration system and all component parts, including valves, shall conform to ASHRAE No. 15 and UL 484 or UL 1995, as appropriate. If more than one refrigerant circuit is supplied, each circuit shall be completely isolated from the other circuit(s). Gage ports or charge valves shall be provided for routine and periodic pressure testing of the system and for field charging and removing of refrigerant. The refrigerant circuit(s) shall be dried, evacuated, and precharged with the refrigerant charge of the type for use in service. A complete charge of refrigerant oil shall be provided within the compressor crank case at the factory. The various components of the air conditioning system shall show a leakage of refrigerant not greater than 0.5-ounce (15 millilitre) per unit per year. No alcohol or other additives shall be used in the circuit. If total capacity of refrigerant charge is greater than Interstate Commerce Commission restrictions, a holding charge may be substituted.
3.9.1 Refrigerant. Unless otherwise specified (see 6.2), the refrigerant in the unit shall be refrigerant R22 (CHC1F2).
3.9.2 Expansion control device. An expansion valve, capillary tubes or orifice shall be required on all units rated at 65,000 Btu/hr (19 050 W) or less. Unless otherwise specified (see 6.2), for units over 65,000 Btu/hr (19 050 W), the manufacturer's standard device for obtaining the refrigeration effect shall be furnished. Capillary tubes and expansion valves installed in refrigerant circuits shall be such that the compressor does not show signs of refrigerant flood back on rated low operating temperature. When capillary device is used, a filter-drier shall be located upstream of the capillary device.
3.9.3 Tubing and piping. Tubing and piping connections shall be arranged in a manner that does not impair the vibration-isolation properties of absorption type mounts. All tubing and piping shall be securely supported to minimize strain and vibration. Unless otherwise specified (see 6.2 and 6.7), joints and threaded joints shall meet the requirements of UL 1995.
3.10 Electrical equipment. Electrical equipment shall conform to UL 484 or UL 1995, as appropriate. Control panel shall be unit mounted or for remote mounting, and of NEMA ICS 6, type 1 or type 12 enclosure, as specified (see 6.2).
3.10.1 Motors and motor starters. Motors and overload protection shall have the electrical characteristics as specified (see 6.2). Motors shall be furnished for the explicitly voltage specified herein. Motors shall conform to NEMA MG-1. Motor starters shall conform to NEMA ICS 1, NEMA ICS 2, NEMA ICS 6 and when specified (see 6.2 and 6.5), shall be of the reduced voltage type. High pressure protection for hermetic motor-compressor units shall conform to the requirements of reference standards of ARI 210/240 and ARI 360, as applicable. When specified (see 6.2), motors and motor starters shall have sealed windings.
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