Practice Test Geeks(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test
← All 313D Flashcard Decks

System Installation and Maintenance Flashcards

7 cards from real 313D practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 System Installation and Maintenance flashcards as text

  1. When installing an outdoor condensing unit, what is the minimum recommended clearance from the unit to surrounding walls or fences on the service side?

    Answer: 36 inches

    Most manufacturers require at least 36 inches of clearance on the service side of the outdoor unit to allow safe and effective maintenance access.

  2. During installation, which type of pipe insulation is most suitable for residential refrigerant suction lines?

    Answer: Closed-cell foam insulation

    Closed-cell foam insulation is preferred for suction lines because it resists moisture absorption and provides effective thermal insulation.

  3. When mounting an air handler in a horizontal position in an attic, which direction should the condensate drain slope?

    Answer: Downward away from the unit at a minimum 1/8 inch per foot

    Condensate drain lines must slope downward away from the unit at a minimum of 1/8 inch per foot to ensure proper drainage by gravity.

  4. What is the primary reason for installing a vibration isolation pad under a residential condensing unit?

    Answer: To reduce noise and vibration transmission to the structure

    Vibration isolation pads absorb compressor and fan vibrations, preventing noise and structural vibration from transmitting into the building.

  5. A technician is installing a new split system and must size the refrigerant line set. Which factor is MOST critical when determining the suction line diameter?

    Answer: The tonnage of the system and the equivalent length of the run

    Suction line diameter must be sized based on system tonnage and total equivalent line length to maintain adequate refrigerant velocity and minimize pressure drop.

  6. During a new installation, after brazing refrigerant lines, what procedure must be performed before charging the system?

    Answer: Pressure test with nitrogen then evacuate to a deep vacuum

    After brazing, the system must be pressure-tested with dry nitrogen to check for leaks, then evacuated to a deep vacuum (typically 500 microns or less) to remove moisture and air before charging.

  7. When anchoring refrigerant line sets to wall studs or joists, what is the maximum recommended spacing between hangers or supports for copper tubing up to 7/8-inch OD?

    Answer: 6 feet

    Industry standards recommend supporting copper refrigerant tubing at a maximum of 6-foot intervals to prevent sagging, vibration, and stress on fittings.