This Standard covers gas-fired refrigerators, hereinafter referred to as refrigerators or appliances, having refrigerated spaces for: (a) Storage of foods; or (b) Storage of foods and making ice; or (c) Storage of frozen foods and making ice; or (d) Storage of foods and the storage of frozen foods and making ice.
It applies to newly produced, unvented, portable refrigerators constructed entirely of new, unused parts and materials, with input ratings of 1000 Btu per hour (293 W) or less, and which are for use with HD-5 propane gas only. These refrigerators are intended for use both indoors in adequately ventilated structures and outdoors.
This Standard applies to refrigerators designed for self-contained fuel supplies and using fuel cylinders of not more than 75 cubic inches (1230 cm³) (2½ pounds nominal water capacity). Fuel supplies shall be in accordance with the Standard for the Storage and Handling of Liquefied Petroleum Gases, ANSI/NFPA No. 58.
Refrigerators submitted for examination under this standard shall use Group 2 refrigerants in quantities not exceeding 6 pounds (2.7 kg). Group 2 refrigerants include, but are not limited to, the following:
(Refrigerant / ANSI/ASHRAE 34 Designation) : Ammonia / 717
Refrigerant systems shall comply with the applicable provisions of the Standard Safety Code for Mechanical Refrigeration, ANSI/ASHRAE 15.
A refrigerator submitted for examination under this standard shall be provided with a direct self-contained type of system employing the absorption or adsorption principle of refrigeration.
This Standard also covers all electrical equipment, wiring and accessories built in or supplied with refrigerators for use with low voltage direct current or alternating current. Appliances for use with alternating current shall be nominally rated 120 volts, 60 hertz.
Refrigerators for use with gas fuel that are also for use with electricity shall also comply with the applicable provisions of the Standard for Household Refrigerators and Freezers, ANSI/UL 250.
If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.
All references to psi throughout this standard are to be considered Gage pressures unless otherwise specified.
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ANSI Z21.74a-2010 - Addenda 1 to Z21.74-1992, Portable Refrigerators for Use With HD-5 Propane Gas