What voltage is required for a single-phase air conditioning unit?

• 415V

• 240V

• 380V

• 110V

Answer explanation

A single-phase air conditioning unit typically operates at 240V, which is standard for residential applications. Other voltages like 415V and 380V are more common in three-phase systems.

Which of the following is NOT a characteristic to consider when installing an air conditioning unit?

• Building height

• Type of flooring

• Window size

• Number of light bulbs

Answer explanation

Type of flooring is not relevant when installing an air conditioning unit. Key factors include building height, window size, and the number of light bulbs, as they affect cooling load and efficiency.

What type of maintenance is performed to fix a malfunctioning air conditioning unit?

• Routine maintenance

• Corrective maintenance

• Scheduled maintenance

• Preventive maintenance

Answer explanation

Corrective maintenance is performed to address and fix specific malfunctions in an air conditioning unit, making it the appropriate choice for this situation.

What should be avoided when installing the outdoor unit?

• Solid foundation

• Good air circulation

• Direct sunlight

• Easy access for maintenance

Answer explanation

Direct sunlight should be avoided when installing the outdoor unit as it can lead to overheating and reduced efficiency. A solid foundation, good air circulation, and easy access for maintenance are beneficial.

What is the function of a Direct On Line (D.O.L) starter?

• To enhance cooling capacity

• To increase voltage

• To protect the air conditioning unit from overload

• To reduce energy consumption

Answer explanation

The Direct On Line (D.O.L) starter is designed to protect the air conditioning unit from overload by providing a direct connection to the power supply, ensuring safe operation and preventing damage from excessive current.

What is a common issue if the indoor unit is not cooling properly?

• Thermostat set too low

• Air filter is clean

• Thermostat set too high

• Outdoor unit is functioning well

Answer explanation

If the indoor unit is not cooling properly, a common issue is that the thermostat is set too high, preventing the system from reaching the desired temperature. Lowering the thermostat can help restore proper cooling.

What is the purpose of the clamp on meter?

• To check refrigerant levels

• To measure current and voltage

• To test insulation resistance

• To measure air pressure

Answer explanation

The clamp on meter is designed to measure current and voltage without needing to disconnect the circuit, making it essential for electrical diagnostics. Other options do not align with its primary function.

What should be considered when installing the indoor unit?

• The location must be sturdy.

• The unit should be placed near heat sources.

• The installation can be done anywhere.

• The unit should be installed without any support.

Answer explanation

The location must be sturdy to support the weight and operation of the indoor unit. A stable installation prevents vibrations and potential damage, ensuring efficient performance.

What are the consequences of improper installation of the indoor unit?

• It guarantees the safety of the unit.

• It can cause the unit to vibrate.

• It prevents water from leaking.

• It ensures the unit operates efficiently.

Answer explanation

Improper installation of the indoor unit can lead to vibrations due to misalignment or instability. This can affect performance and cause noise, making it a significant consequence of incorrect setup.

Electrical connections are loose or burnt. Possible causes include loose terminal connections, vibrations from the condenser unit, and undersized/inappropriate cables.

• Ensure bolts and nuts of wiring bracket are tightly secured

• Tighten connections

• Check cable size suitable for air-conditioning horsepower

Answer explanation

Tightening connections is essential to prevent loose or burnt electrical connections, as it directly addresses the issue of loose terminal connections, which can lead to failures.