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313D Residential Air Conditioning Systems Mechanic VIP Certification Exam
313D — The 313D is an Ontario Certificate of Qualification (C of Q) for Residential Air Conditioning Systems Mechanic, regulated by Skilled Trades Ontario; the provincial trade exam consists of approximately 100 multiple-choice questions administered over 3 hours with a 70% passing threshold.
52
Questions
180m
Time Limit
70.00%
To Pass
Question 1 of 52👑 VIP
A technician is about to perform a refrigerant recovery on a residential split system that has been shut down for over a year. The system uses R-410A. Before connecting any hoses, which safety action is MOST critical given the unknown system condition?
Questions 2–52 and full explanations are VIP-exclusive.