3T HC Refrigerants User Manual
For Refrigeration, Air Conditioning & Heat Pumps. Meeting the legal RAC legal
requirements for our industry
This qualification meets the competence and training requirements of the EC Regulation 378/2016.
The aims of the qualification are to:
Meet the legal qualification requirements for candidates who work or want to work with
hydrocarbon gases, as engineers in the refrigeration, air conditioning and heat pump sector
Allow candidates to learn, develop and practice the skills required for employment to work
with hydrocarbon gases
Understand the specific health and safety requirements which apply to the installation,
servicing and maintenance and de-commissioning of hydrocarbon RAC systems
Understand the environmental benefits of using hydrocarbon refrigerants
Allow successful candidates to purchase HC refrigerants
Candidates who attend this course must already have a F-Gas qualification (C&G 2079-11, C&G
2079-12, Skills J11 or Skills J12)
Our standard HC Refrigerants training course is run over one day, covering both the theoretical
knowledge and practical skills required for the assessments. A two day training course is available for
less experienced engineers at an additional £105.00.
Course fees include pre-course training notes, a comprehensive
training manual, professional training, all required assessments,
certification, refreshments and lunches
£320.00 + VAT per person
3T Services Training Centre
Unit 4 EBL Centre
Picow Farm Road
Runcorn
Cheshire, UK
WA7 4UA
Tel.! 01928 898191
Fax.! 01928 572854
email! training@3tservices.net
web! www.3tservices.co.uk
HC REFRIGERANTS
City & Guilds 6187-21
City & Guilds 6187-21 Practical Tasks
Complete a location specific risk assessment (using a dynamic risk assessment template)! Establish and maintain a safe working area.
Select appropriate tools, equipment and PPE for work on hydrocarbon RAC systems
Calculate the safe fill weight for the recovery cylinder (density difference between HFCs & HCs)
Connect equipment in preparation for recovery! ! ! ! Recover hydrocarbon refrigerant to a prescribed pressure
Fill the system with Nitrogen to a prescribed pressure and release to atmosphere! Un-braze specified component
Re-braze specified component while purging Nitrogen through pipework! ! Pressure test joints (containment)
Evacuate to below 2000 microns! ! ! ! ! ! Re-charge with specified refrigerant weight
Run system and check operation! ! ! ! ! ! Remove charging equipment
Seal system and complete leak test with appropriate equipment! ! ! Complete service records as appropriate
"
City & Guilds 6187-21 Underpinning Knowledge
Identify the hazards associated with hydrocarbon refrigerants; flammability, low boiling point, asphyxiation, LFL, UFL, sources of ignition, practical
limits and density.
State and identify the commonly used refrigerant designations. State the requirements of hydrocarbon specific risk assessments
Identify the appropriate fire extinguishers for work on hydrocarbon RAC systems.
State the appropriate sources of health and safety information when installing, servicing and maintaining and de-commissioning of RAC systems
State the regulations, codes of practice, and industry recommendations appropriate to the installation, servicing and maintenance and decommissioning of RAC systems, including working with refrigerants.
State the occupancy classifications and charge size limitations for refrigeration systems.
State charge size limitations for human comfort cooling and heating for air conditioning systems.
Identify the specific system features and components which apply to hydrocarbon systems; electrical devices, electrical enclosures, associated electrical
devices (including halocarbon systems) & compressors (including starter and associated electrics).
Identify the features and characteristics of; critical charge systems & oil compatibility.
State the properties, advantages and disadvantages of hydrocarbon refrigerants including: leakage implications (direct and indirect), thermodynamic
properties, cooling capacity and energy efficiency, density & not stenched.
Explain why hydrocarbons are not suitable for retro-filling into halocarbon systems.
Identify typical applications of hydrocarbon RAC systems: integral (plug in systems), fluid chillers, high stage CO2 cascade systems, split AC systems &
domestic fridge freezers (ISO butane).
State the requirements for completing a risk assessment for work on hydrocarbon RAC systems.
State the requirements for creating and maintaining a safe working area, including requirements for temporary zoning.
Identify appropriate tools and equipment for work on hydrocarbon RAC systems.
Identify occupancy class. Identify the maximum refrigerant charge based on occupancy class.
Calculate the maximum charge based on the practical limit. Determine from calculations the system specific maximum charge.
State the methods and procedures for: strength integrity testing, tightness testing, leak testing & evacuation and dehydration.
State the procedures for charging hydrocarbon refrigerants into systems. State the procedures for determining when charge is correct.
State the records to be completed prior to handover. State the requirements for safely labelling hydrocarbon RAC systems.
Specify the information that should be provided to customers, including; operation of system controls, using only appropriately trained servicing
personnel & restrictions on the relocation of equipment.
Identify appropriate ‘like for like’ replacement components for the following; electrical devices, electrical enclosures, associated electrical devices
(including halocarbon systems) & compressors (including starter and associated electrics).
State the importance of maintaining the integrity of sealed electrical enclosures.
State appropriate methods for accessing and sealing hydrocarbon systems.
Specify the requirements for recovering hydrocarbon refrigerants, including situations when it may be safe to vent refrigerants to atmosphere.
State the requirements for the safe use of vacuum pumps evacuating hydrocarbon systems.
Identify the safe procedures for handling potentially hazardous systems materials, including: hydrocarbon refrigerants.
Identify work sequences for decommissioning and making safe a system in accordance with appropriate industry procedures.
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All aspects of the underpinning knowledge are covered within the one day training course. Addition practical training is covered within the two day
training course
3T Services Training Centre
Unit 4, EBL Centre
Picow Farm Road
Runcorn
Cheshire, WA7 4UA
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