A refrigeration contractor constructs, fabricates, erects, installs, maintains, services and repairs refrigerators, refrigerated rooms, and insulated refrigerated spaces, temperature insulation, air-conditioning units, ducts, blowers, registers, humidity and thermostatic controls for the control of air, liquid, and/or gas temperatures below fifty degrees Fahrenheit (50 ), or ten degrees Celsius (10 ).
Authority cited: Sections 7008 and 7059, Reference: Sections 7058 and 7059 (Business and Professions Code)
Content of the Examination
The Refrigeration (C-38) Examination is divided into five major sections. These sections are:
1. Job Preparation (11%)
Plan/schematics
Types of refrigeration systems
2. Installation (23%)
Critical path requirements
Rough installation
System start up and testing
3. Maintenance (18%)
Inspections and documentation
Preventative maintenance
4. Troubleshooting/Repair (30%)
Common refrigeration system problems
Troubleshooting techniques/diagnosis
System repair
5. Safety (18%)
Chemical hazards
Working in elevated areas
Worker safety/training
Electrical hazards
*Percentages are approximate*
Sample Questions
The following questions are typical of the types of items that are on the examination. The correct answer is highlighted.
1. What is the function of a vacuum pump?
Charge the unit.
Add oil to the compressors.
Remove oil from the compressors.
Remove noncondensible gases from the system.
2. What are the symptoms of bad valves in a compressor?
short cycling
long run cycle
high suction and low head pressure
low suction and high head pressure
3. All of the following are methods of heat transfer EXCEPT:
conduction
compression
convection
radiation
*All questions are written and reviewed by licensed contractors who are actively working in the field*
Resources
Cal/OSHA State of California Construction Safety Orders.
