Grayson County College

Refrigeration and Air Conditioning Technology

Associate of Applied Science Degree

This curriculum prepares students for opportunities as refrigeration and air conditioning technicians. Instruction is given under actual shop conditions where students develop an understanding of the operation and performance of refrigeration and air conditioning systems and components. The refrigeration and air conditioning industry needs qualified technicians to satisfy the increasing production of refrigeration and air conditioning systems.

Refrigeration and Air Conditioning Technology Associate of Applied Science Degree
Freshman Year
First Semester		Second Semester
Subject	Semester Hours	Subject	Semester Hours
Refrigeration A/C 1600	6	Refrigeration A/C 1610	6
Core Mathematics**	3	Refrigeration A/C 2300	3
Drafting 1310	3	Drafting 1340	3
English 1301	3	Social/Behavioral Science*	3
Orientation 0100	0	Elective	2
	15		17
*GOVT 2305 or 2306; HIST 1301, 1302 or 2301; PSYC 2301, 2315, 2314; SOCI 1301, 2301 or ANTH 2351
**MATH 1314, 1316, 2324 OR 2342
Sophomore Year
First Semester		Second Semester
Subject	Semester Hours	Subject	Semester Hours
Refrigeration A/C 2310	3	Refrigeration A/C 2600	6
Refrigeration A/C 2320	3	Refrigeration A/C 2330	3
MET 2150	1	Speech 1311	3
MET 2250	2	Drafting 2340	3
Social/Behavioral Science*	3	Elective	2
Elective	4
	16		17
*GOVT 2305 or 2306; HIST 1301, 1302 or 2301; PSYC 2301, 2315, 2314; SOCI 1301, 2301 or ANTH 2351

Students who desire Associate of Applied Science Degrees, see degree requirements.

Refrigeration and Air Conditioning

Exit Point I: Installer. Upon completion of RAC 1600, 1610, and any advanced RAC course, students will be eligible for a certificate.

Exit Point II: Technician. Upon completion of requirements in Exit Point I and the remaining RAC courses (Total of seven RAC courses), students will be eligible for a certificate.

Capstone Experience: Graduation with a Technicians Certificate or an Associate of Applied Science Degree in Refrigeration and Air Conditioning requires successful completion of a comprehensive exit exam.

Refrigeration and Air Conditioning Technology Course Descriptions

RAC 1600. Refrigeration Fundamentals I. (4-4-6). Refrigeration history, heat, temperature and pressure, gas laws, mechanical refrigerator, refrigerants and oils, compressors, system dehydration, evacuation, metering devices, condensers, evaporators, and accessories. Laboratory tasks include welding, soldering, brazing, tube fabrication, system charging, system evacuation, refrigerant cylinder, common hand tools, installation and adjustment of the automatic expansion valve, thermostatic expansion valve and capillary tube. Safety practices with hand tools and refrigeration equipment.

RAC 1610. Refrigeration Fundamentals II. (4-4-6). Electrical components in the operation of refrigeration equipment. Electron theory, voltage, current, resistance, circuits, circuit analysis, test equipment operation and test equipment application. Laboratory tasks include use of the voltmeter, ammeter and ohmmeter to study normal series, parallel and series parallel circuits, testing for open circuits, shunts, shorts to ground, motors, relays and electrical components for a better understanding of components and test equipment, wire circuits and components, development of practical trouble-shooting methods.

RAC 2300. Domestic Refrigeration. (2-2-3). Principles of operation of domestic refrigerating units. The basic refrigeration cycle expanded to include domestic refrigeration equipment. Electrical systems, defrost systems, frost-free cycles, compressor changeout, sizing and replacement of capillary tubes, mullion heaters and service procedures for low temperature domestic units. Laboratory practice in trouble-shooting and repairing domestic systems emphasized. Prerequisites: RAC 1600 and 1610.

RAC 2310. Commercial Refrigeration. (2-2-3). Refrigeration equipment and tools used in the commercial area of the industry. The basic refrigeration cycle in relation to icemakers, both plate and chip type, walk-in refrigerators, reach-ins, display cases, and ice cream machines. Multi-compressor combinations, multiple evaporators, compressor capacity control, oil safety control, cylinder unloader, defrost systems, commercial control diagrams and heat re-claim designs used in supermarkets. Prerequisites: RAC 1600 and 1610.

RAC 2320. Heating Fundamentals. (2-2-3). Heating fundamentals: various types of heating equipment and tools necessary to size, install and service heating equipment. Gas heating burners, controls, safety precautions, installation and service procedures, sources of heat, electric furnaces, radiant heaters, heat pumps, solar heating, boilers and control circuits for efficient and safe heating systems. Prerequisites: RAC 1600 and 1610.

RAC 2330. Air Conditioning Automatic Controls. (2-2-3). Automatic control theory as applied to commercial and residential control systems. Proper procedure for testing, installing and operating pneumatic, electric, and electronic control systems. Laboratory functions include control installation, calibration, and testing. Related tasks on laboratory equipment. Prerequisites: RAC 1600 and 1610.

RAC 2600. Air Conditioning. (4-4-6). Principles and operation of total air conditioning systems. Detailed study of the properties of air and property changes that must be made by air conditioning equipment to condition the air for different applications such as residences, hospitals, restaurants, computer rooms, and industrial applications. Psychometrics, psychometric processes, heat load calculation, air distribution, duct sizing, equipment selection, pricing guides, contractor regulations, and cost analysis. Prerequisites: RAC 1600 and 1610.

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