City & Guilds 2079-11
City & Guilds Level 2 Award in F-Gas and ODS Regulations - Category I (2079-11)
F-Gas Category I Courses
Category I
Certificate holders may carry out all of the following activities for any size of RAC systems containing HFC refrigerants - leakage checking, refrigerant recovery, installation, maintenance and servicing
Unit 2079-101
The Online multi choice assessment is made up of 40 questions and you have 1 hour and 20 minutes (80 minutes) to complete it. The result is either a pass or fail, the exact percentage of correct answers required to attain the pass mark is less than 100%, and based on the questions answered correctly within each of the eleven sections covered.
Unit 2079-102
The practical assessment covers a range of activities which must be completed within a period of 4 hours. All practical tests must be successfully completed within the time frame to be awarded a pass.
If the candidate does not pass both units they are deemed not yet competent. Candidates that are not yet competent can re-take either, or both, the theory and practical assessments. The practical assessment must completed again in its entirety, candidates retaking this assessment cannot undertake only those aspects of the practical assessment where they were previously unsuccessful.
Underpinning Knowledge
Candidates are required to;
- Identify standard units of temperature, pressure, mass, density and enthalpy
- Describe basic theory of basic vapour compressions cycle, including key terms and use of basic pressure enthalpy diagram.
- Describe the function of the four major components/processes (compressor, condenser, expansion device, evaporator)
- Identify condition/state of refrigerant (i.e. superheated vapour / 2 phase mix / subcooled liquid) by use of refrigerant comparator or service gauge.
- Determine reasonable operating conditions (saturated temperatures) for a condenser and evaporator, for a range of applications.
- Describe features of zeotropic blends
- Understand the function of and role / importance of monitoring system performance for indications that leakage has occurred from:
valves – service, pressure relief
thermostats / pressure controls
liquid line, receiver sight glasses and indicators
defrost controls
overloads
service gauge manifold and thermometer
oil control and separator systems
high pressure receivers
low pressure accumulators
- Describe climate change and the Kyoto Protocol.
- Understand direct and indirect Global Warming Potential (GWP) of the common HFC and HC refrigerants.
- Understand importance of energy efficiency on greenhouse gas emissions to the atmosphere
- Describe the basic requirements of Regulation (EC) No. 517/2014 and other relevant regulations.
- Describe the equipment records / commissioning data requirements to be recorded in such records.
- Identify potential leakage points of refrigeration / air conditioning and heat pump equipments
- State requirements and procedures for handling, storage, transportation and disposal of contaminated refrigerant and oil.
- Describe the function of a compressor and the risks of refrigerant leakage or release associated with it.
- Identify the state / condition of a compressor that could lead to refrigerant release.
- Describe the function of a condenser and the risks of refrigerant leakage or release associated with it.
- Identify the state / condition of a condenser that could lead to refrigerant release.
- Describe the function of an evaporator and the risks of refrigerant leakage or release associated with it.
- Identify the state / condition of an evaporator that could lead to refrigerant release.
- Describe the function of a thermostatic expansion valve and a capillary tube restrictor, and the risk of refrigerant release associated with them.
- Identify the state / condition of a thermostatic expansion valve and capillary tube restrictor that could lead to refrigerant release.
- Demonstrate knowledge of the potential of HCFC refrigerants to deplete ozone, and the effect of chlorine on ozone depletion. Identify the ODP of various HCFC refrigerants in use.
- Describe the basic requirements of Regulation (EC) 2037/2000 and the impact of the Montreal Protocol.
- Describe the hazards associated with refrigerant release, including
Cold burns
Asphyxiation
Thermal decomposition
CNS effect
Cardiac sensitisation
Describe the hazards associated with Flame brazing
Describe the hazards associated with pressure testing with nitrogen
Practical Skills
Candidates are required to;
- Complete a brazed joint and install the pipework on to the system
- Examine the pipework on system
- Determine the appropriate pressures to EN378
- Carry out a strength test
- Carry out a tightness test
- Evacuate the system to below 2 Torr / 2000 microns
- Complete pressure testing and evacuation records
- Charge a zeotropic blend into the system, record weight charged
- Run the system
- Identify the state of the refrigerant in the cylinder prior to charging
- Identify the states of the refrigerant in the system while running
- Visually inspect the system for leaks
- Use gauges/thermometer/comparator/sight glass & log book to determine the charge is correct by an indirect leakage check
- Use electronic leak detector to carry out a direct leak check
- Complete leak check records
- Connect & disconnect gauges to/from the system with minimal refrigerant loss using service valves
- Connect & disconnect gauges to/from the system with minimal refrigerant loss using schraeder valves
- Recover refrigerant from the system into a recovery cylinder
- Record the weight of refrigerant recovered
- Remove the brazed joint test piece and inspect for penetration by cutting through the joint
- Drain oil from a compressor
We offer a number of training / assessment programs to suit differing levels of candidate experience. We also offer the facility to retake either the theory or practical assessments, regardless of which training centre the original assessment was taken.
Bespoke training courses, different from the choices below, can be arranged on request.
Please use the above link buttons for more information on each of the training courses
Training Diary
A complete list of all scheduled training courses and availability can be found by clicking the course dates button below
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