Official Course Description: MCCCD Approval: 07/22/08
HVA280 19962-20086	LEC	3 Credit(s)	3 Period(s)
Introduction to Ammonia Refrigeration
Thermal properties of ammonia and halocarbon refrigerants, ammonia safety and ammonia refrigeration components. Compressor capacity, lubrication systems, and piping arrangement for specific components. The effects of non- condensables. Prerequisites: None.

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MCCCD Official Course Competencies:
HVA280   19962-20086	Introduction to Ammonia Refrigeration

1.	Describe the thermal properties of ammonia refrigerant. (I)
2.	Explain safety procedures related to ammonia leaks. (II)
3.	Describe the flammability of ammonia refrigerant. (III)
4.	Identify the component parts of a simple ammonia vapor- compression system. (IV)
5.	Explain the operation of specific types of ammonia compressors. (V)
6.	Calculate revolutions-per-minute and feet-per-minute for specific compressors. (VI)
7.	Describe methods of starting compressors. (VII)
8.	Explain compressor lubrication and problems associated with oil. (VIII)
9.	Describe the operation of specific cooling units (evaporators). (IX)
10.	Explain the functions and types of condensers and receivers. (X)
11.	Describe traps and piping arrangement from multiple condensers into a common receiver. (XI)
12.	Explain the effects of non-condensables and the method of purging. (XII)
13.	Explain the pump-down techniques for changing specific components of a system. (XIII)

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MCCCD Official Course Outline:
HVA280   19962-20086	Introduction to Ammonia Refrigeration

I. Thermal properties A. Ammonia B. Halocarbon refrigerants II. Ammonia safety A. Procedures - Occupational Safety and Health Administration (OSHA) B. Leak testing III. Ammonia flammability A. Lower limit B. Upper limit C. Venting D. Occupational Safety and Health Administration IV. Ammonia system components A. Compressor types B. Evaporators C. Condensers D. Flow control devices E. Accumulators F. Other V. Ammonia compressors A. Specific types B. Operational characteristics VI. Compressor capacity A. Revolutions-per-minute B. Feet-per-minute VII. Compressor starting methods A. Vertical single actions B. Rotary booster C. Centrifugal VIII. Compressor lubrication A. Oil quality B. Ammonia compressor C. Halocarbon compressor D. Oil return E. Oil separator IX. Cooling units (evaporators) A. Direct expansion B. Flooded C. Secondary D. Service X. Condensers and receivers A. Water B. Evaporative C. Air D. Condenser-receiver E. Flow through F. Surge XI. Piping arrangement A. Single evaporators B. Multi-evaporators C. Receiver piping D. Valve location XII. Non-condensable and purgers A. Sources B. Effects of non-condensables C. Hand purging D. Automatic purging XII. Changing specific components A. Pump-down B. Solenoid C. Strainer D. Other

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