scope:

This standard is applicable to

a. electronic and thermostatic expansion valves (also referred to in this standard as "expansion valves") as defined in Section 3;

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 Standard for Refrigeration Systems ¹ and ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants ².

This standard does not

a. specify tests for production, specification compliance, or field testing of expansion valves or

b. specify capacity rating conditions for testing expansion valves.

These can be found in AHRI Standard 750, Thermostatic Refrigerant Expansion Valves ³; AHRI Standard 751, Thermostatic Refrigerant Expansion Valves ⁴; AHRI 1370, Performance Rating of Electronic Expansion Valves ⁵; and AHRI 1371, Performance Rating of Electronic Expansion Valves ⁶.

PURPOSE

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