Air Conditioning Repair Installation and Service Procedures 2

Question 1

What is the minimum required clearance between a condensing unit and a wall or fence on the service side?

Accepted Answer

24 inches

Answer

ACCA and most manufacturer specifications require at least 24 inches of clearance on the service side of a condensing unit for proper airflow and technician access.

Question 2

When installing a new evaporator coil, what should be done to the existing refrigerant metering device?

Accepted Answer

Replace it with the OEM-matched device supplied with the coil

Answer

The metering device must be matched to the new coil's specifications; the OEM-supplied device ensures proper refrigerant distribution and system efficiency.

Question 3

Which tool is used to ensure refrigerant line sets are properly supported and do not transmit vibration into the building structure?

Accepted Answer

Vibration isolation hangers

Answer

Vibration isolation hangers absorb compressor vibration and prevent it from being transmitted through copper lines into walls and ceilings.

Question 4

What is the purpose of trapping the suction line at the base of a vertical rise when the evaporator is located above the condensing unit?

Accepted Answer

To prevent oil from draining back and flooding the compressor during off cycles

Answer

An oil trap at the base of a suction line riser ensures oil circulates back to the compressor and does not accumulate in the low point of the line.

Question 5

A technician is installing a split system where the line set run is 75 feet — 25 feet longer than the manufacturer's standard. What adjustment is typically required?

Accepted Answer

Add refrigerant charge per the manufacturer's extended line set table

Answer

Manufacturers publish refrigerant add-per-foot tables for line sets longer than the tested standard length to compensate for the additional volume.

Air Conditioning Repair Practice Test

Air Conditioning Repair Practice Test

Air Conditioning Repair Installation and Service Procedures 2