313D System Installation and Maintenance 2

Question 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?

Accepted Answer

36 inches

Answer

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

Question 2

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

Accepted Answer

Closed-cell foam insulation

Answer

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

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

To reduce noise and vibration transmission to the structure

Answer

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

Question 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?

Accepted Answer

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

Answer

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

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

313D System Installation and Maintenance 2