Install MOD Week 4 Exam

On mini-split systems both refrigerant lines must be insulated because they are both:

• Low pressure and low temperature in the heating mode.

• Low pressure and low temperature in the cooling mode.

• Low pressure and low temperature in the heating and cooling mode.

• Low pressure and high temperature in the cooling mode.

The refrigerant lines for single zone mini-split air conditioners are usually connected by:

• SAE compression fittings.

• Brazed connections.

• Flare fittings.

• Reflok fittings.

Which of the following is NOT a type of indoor unit used on mini-split systems?

• Wall mount

• Ceiling suspended

• Floor mount

• Crawl space

Power for the mini-split system is supplied:

• To the outdoor unit which powers the indoor unit.

• To the indoor unit which powers the outdoor unit.

•  To the indoor and outdoor with their own separate dedicated wiring and circuit protection.

• Any of these methods may be used.

Designing a heating and cooling system to accommodate load shifts:

• Allows buildings to operate with less installed capacity and still meet the demand.

• Improves comfort.

• Improves efficiency.

• All of the above.

Variable refrigerant flow systems use:

• Inverter driven systems and thermostatic expansion valves.

• Inverter driven systems and electronic expansion valves.

• Scroll compressors and electronic expansion valves.

• Scroll compressors and thermostatic expansion valves.ee

A type system that allows simultaneous heating and cooling to different parts of a building is the:

• Multisplit system.

• Heat pump variable refrigerant flow system.

• Heat recovery system.

• All of the above.

On heat recovery systems:

• It is required that all indoor units be in cooling mode.

• It is required that all indoor units be in heating mode.

• One indoor unit can be in heating mode while others are in cooling mode at the same time.

• Both A and B.

VRF systems are commercial systems. The outdoor units are normally designed to operate on ________ phase power and the indoor units on ________ phase power.

• single, single

• single, three

• three, three

• three, single

Before beginning the installation, the first thing the installing technician should do is:

• Load up the truck with the required materials to install the system.

• Read the installation instructions and make a list of materials.

• Charge their cell phone so that they can call the shop for instructions.

• Locate the installation instructions and put them in a safe place in case there are difficulties with the installation that require consulting the instructions.