RAC Servicing (DomRAC) NC II case studies
RAC Servicing (DomRAC) NC II · Put your knowledge to work in context.
RAC Servicing (DomRAC) NC II is a Philippine national certificate for people who install, service, troubleshoot, and repair domestic refrigeration and air conditioning equipment - household refrigerators, window-type and split-type air conditioners, and similar small-capacity systems. It is typically pursued by technicians already working in appliance service shops, HVAC contractors, or building maintenance, and by trainees coming out of TVET programs who want their skills assessed against a recognized standard. The RAC Servicing (DomRAC) NC II case studies are 5 cases and about 3,525 words.
112 m Line Set on a 2.5 HP R-32 Inverter: Charge, Vacuum and Flare Decisions
A two-person crew is commissioning a 2.5 HP inverter split-type air conditioner in a newly built 28 m² dental clinic (ceiling height 2.5 m). The nameplate states a factory charge of 1.10 kg, sufficient for 5 m of 9.52 mm (3/8 in) liquid line, with an additional 30 g per metre beyond 5 m.
737 words, about 4 min2R-600a No-Frost Refrigerator: Restriction or Undercharge?
A no-frost refrigerator in a care-home kitchen uses R-600a with a nameplate charge of 65 g; the compressor is rated 0.9 A. After 24 hours the freezer sits at −6 °C and the food compartment at 9 °C.
715 words, about 4 min3Decommissioning Day: Three Refrigerants, One Recovery Cylinder
A workshop schedules a decommissioning day. The job list: two R-22 window units (nameplate charge 0.75 kg each), one R-410A split-type (nameplate 1.40 kg), and an unlabelled cylinder left behind by a previous owner.
721 words, about 4 min4Grease-Fouled Window Unit in a Canteen
A 1.5 HP window-type air conditioner cools the staff canteen of a small factory, running 06:00–22:00 daily, seven days a week. The kitchen hood exhaust discharges 3 m from the unit's outdoor grille.
675 words, about 3 min5Second-Week Helper, 3.2 m Wall and a Customer in a Hurry
A two-person crew must install a 1.0 HP split-type unit in a 12 m² office before the building closes at 17:00; they arrive at 14:30 and the electrical rough-in is not finished. The indoor unit mounts at 3.2 m on a concrete wall.
677 words, about 3 min