C&G 2079-11 F-Gas Category I case studies
C&G 2079-11 F-Gas Category I · Put your knowledge to work in context.
City & Guilds 2079-11 (F-Gas and ODS Regulations, Category I) is a UK vocational qualification for technicians who handle fluorinated greenhouse gases and ozone-depleting substances in refrigeration, air conditioning and heat pump work. Category I is the widest category, aimed at engineers who carry out the full range of activities - installation, commissioning, servicing, leak checking, recovery and decommissioning - rather than the narrower task sets covered by the lower categories. The C&G 2079-11 F-Gas Category I case studies are 5 cases and about 3,616 words.
1Cold store R-404A: charge, CO2e and leak-check frequency
A regional distribution centre has a low-temperature cold store served by a pumped-circulation R-404A system. The nameplate charge is 130 kg and the GWP of R-404A is 3922.
732 words, about 4 min2R-22 chillers: reusing recovered HCFC to keep one running
A city-centre hotel has two air-cooled R-22 chillers, each with a 60 kg charge. Chiller A has been losing pressure for two years and the last contractor simply topped it up.
693 words, about 3 min3R-32 VRF tightness test: is that half a bar a leak?
You are commissioning a new R-32 VRF system in a converted office: one outdoor unit, six indoor units, 38 m of 12.7 mm liquid line and 42 m of 15.88 mm gas line. The manufacturer specifies a design pressure of 4.15 MPa (41.5 bar) and a nitrogen tightness test at 4.0 MPa for 24 hours, followed by evacuation.
772 words, about 4 min4A2L chiller in a plant room: charge, ignition sources and signing off
A small hotel refurbishment has installed a 45 kg R-32 (A2L) air-cooled chiller in a newly built plant room measuring 5.0 m x 4.0 m x 2.8 m, with a louvred door and no mechanical ventilation. The room also houses the electrical distribution board, a gas-fired boiler with a permanent pilot light, and two spare gas cylinders left by the previous tenant.
711 words, about 4 min5Recovery cylinder fill limit and a mystery mixed cylinder
You are decommissioning three split systems in a retail unit: charges of 2.8 kg, 3.5 kg and 4.2 kg, a total of 10.5 kg of R-410A. Your recovery cylinder is marked water capacity 12.0 L, tare 9.0 kg, maximum working pressure 32 bar, and the plant room is at 26 C, where liquid R-410A has a density of about 1.05 kg/L.
708 words, about 4 min