Refrigerant Systems Controls and Accessories
ASHRAE Technical Committee 8.8

Scope of TC 8.8

TC 8.8 is concerned with refrigerant flow controls and other refrigerant control devices, including relief devices, check valves, condenser water regulators and oil separators.


The ASHRAE Handbook is published in a series of four volumes, one of which is revised each year, ensuring that no volume is older than four years.

The Handbook can be purchased at the ASHRAE Bookstore by clicking on this link.

This TC is responsible for the following chapter in the Refrigeration Volume:

Refrigerant Control Devices
Control of refrigerant flow, temperatures, pressures, and liquid levels is essential in any refrigeration system. This chapter describes a variety of devices and their application to accomplish these important control functions. Most examples, references, and capacity data in this chapter refer to the more common refrigerants. For further information on control fundamentals, see "Fundamentals of Control" of the ASHRAE Handbook Fundamentals and "Design and Application of Controls" of the ASHRAE Handbook HVAC Applications.

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Technical committees develop and sponsor technical sessions at the winter and annual conferences. Information about their future technical program is discussed at each TC meeting and at the TC’s Program Subcommittee meeting.

ASHRAE publishes papers and transactions from presentations at its conference events. In addition, ASHRAE records most of the seminar sessions from its conferences on DVD. These DVDs are ideal for use at chapter meetings, in university courses, or company lunch and learns. Products available from the most recent conference may be found here.


Technical Committees are responsible for identifying research topics, proposing research projects, selecting bidders, and monitoring research projects funded by ASHRAE. Information about their specific research program is discussed at each TC meeting and at the TC’s Research Subcommittee meeting.


ASHRAE writes standards for the purpose of establishing consensus for: 1) methods of test for use in commerce and 2) performance criteria for use as facilitators with which to guide the industry. ASHRAE publishes the following three types of voluntary consensus standards: Method of Measurement or Test (MOT), Standard Design and Standard Practice. ASHRAE does not write rating standards unless a suitable rating standard will not otherwise be available. ASHRAE is accredited by the American National Standards Institute (ANSI) and follows ANSI's requirements for due process and standards development. Standards may be purchased at the ASHRAE Bookstore.

This TC is cognizant for the following standards:

ANSI/ASHRAE Standard 17: Method of Testing Capacity of Thermostatic Refrigerant Expansion Valves
ANSI/ASHRAE Standard 28: Method of Testing Flow Capacity of Refrigerant Capillary Tubes
Standard 153: Method of Test for Mass Flow Capacity of Four-Way Refrigerant Reversing Valves
ANSI/ASHRAE Standard 158.1: Methods of Testing Capacity of Refrigerant Solenoid Valves
ANSI/ASHRAE Standard 158.2: Methods of Testing Capacity for Refrigerant Pressure Regulators

Other Activities

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Include other activities, such as MTG involvement, into this section.


ASHRAE Technical FAQs are provided as a service to ASHRAE members, users of ASHRAE publications, and the general public. While every effort has been made to ensure their accuracy and reliability, they are advisory and provided for informational purposes only, and in many cases represent only one person’s view. They are not intended and should not be relied on as an official statement of ASHRAE. Technical questions not addressed may be submitted to the ASHRAE Technical Services department at