Page 18 - R&AC - 1st Year TT Gujarati

73.Identify drier and capillary tube Expansion Valve
used in different cooling
machines. (09 hrs.) Expansion valve used in
domestic refrigeration and air
74.Replace drier and capillary tube conditioning systems.
at the time of gas charging Capillaries, Automatic and
according to manufacturer’s Thermostatic Ex. Valves, and
direction. (10 hrs.) electronic expansion valves.(10
hrs..)
Professional Perform servicing of 75.Identify and service different Evaporator
Skill 16 different evaporator types of evaporators like plate Working principle, Function,
Hrs.; used in different and tube type, Fin andtube types of evaporators used in
appliances. type, etc. fitted in
Professional refrigerators, Bottle coolers, refrigerator, water coolers,
Knowledge water cooler, Window and split bottle coolers, window and split
05 Hrs. A.C, Super heating in
AC. (08 hrs.)
evaporators, Function of
76.Perform leak test, flush to accumulator and types.
remove oil by dry nitrogen in Methods of defrosting.
evaporator. (08 hrs.) (05 hrs..)
Professional Carry out Recovery 77.Identify and explain different Refrigerant
Skill 30 and Recycling of colour code of different type Classification of refrigerants,
Hrs.; Refrigerant used, refrigerant cylinder like HCFCs nomenclature of refrigerants
alternative of CFC, (HCFC-22, HCFC-123). HFCs
Professional including chemical name and
Knowledge HFC re-cover, transfer (HFC-134a, HFC-32, R- 410A, formulas, hydro chloro
06 Hrs. & handing of gas R-407C and R-404A) and low- fluorocarbons (HCFCs), hydro
cylinders. Global Warming Potential fluorocarbons (HFCs) and hydro
(GWP) refrigerants like fluoroolefins (HFOs), blends of
ammonia, R-290, HFC- 32, HFCs and blends of HFCs/HFOs.
blends of HFCs (R-410A, R- Climatic impact of refrigerants:
404A, R-407C etc.) and hydro Stratospheric ozone depletion,
Fluor olefins (HFOs: HFO- global warming, mechanism of
1234yf, HFO-1234ze, HFO- ozone depletion; the Montreal
1233zd, HFO-1336mz), blends Protocol phase-out schedule of
of HFCs and HFOs. (10 hrs.)
ozone depleting refrigerants
78.Recover refrigerant from a faulty (HCFCs) and high global warming
machine. (07 hrs.) refrigerants (HFCs). Brief
introduction of Ozone Depleting
79.Transfer refrigerant from one Substances (Regulation and
cylinder to another using ice. Control) Rules, 2000 and its
(04 hrs.)
amendments. Introduction of
80.Measure pressure properties of refrigerants;
andtemperature of refrigerants environment related properties:
including HCFC-22, ammonia, Ozone Depleting Potential
R-290, HFC-32, HFC-134a, R- (ODP), GWP; ODP and
404A, R-407Cand R-410A, GWP of various
HFOs. Identify flammability and refrigerants, thermo chemical
toxicity of A3 and A2L of properties: flammability and
refrigerants. (09 hrs.) toxicity of refrigerants, lower
flammability limit (LFL) and upper
flammability limit of A3 and A2L
refrigerants. Thermo physical
properties: pressure temperature
of different refrigerants.(06 hrs..)

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