scope:

This standard is applicable to (a) thermostatic expansion valves (also referred to in this standard as expansion valves) as defined in Section 3, "Definitions," (b) expansion valves of the direct-acting type but not the pilot-operated type, and (c) many currently used refrigerants deemed available and suitable according to ANSI/ASHRAE Standard 15, Safety Code for Mechanical Refrigeration, and ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants. This standard specifies procedures, apparatus, and instrumentation that will produce accurate capacity data. This standard does not (a) specify tests for production, specification compliance, or field testing of expansion valves, nor (b) specify capacity rating conditions for testing expansion valves. These may be found in ARI Standard 750, Thermostatic Refrigerant Expansion Valves.

PURPOSE

This standard prescribes a method of testing the capacity of thermostatic refrigerant expansion valves for use in vapor-compression refrigeration systems.