HVACR System Installation and Start-Up Residential Unit 10

When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?

Answer explanation

The correct answer is: Charge as a liquid through the low side using a restrictor.

The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the outdoor condensing unit and 2 oz. in the evaporator. The 3/8" liquid line contains 0.48 oz. per foot and the 7/8" suction line contains 0.10 oz. per foot. The refrigerant lines are 30' long. What is the correct refrigerant charge for this system?

Answer explanation

The correct answer is: 7 lb. 11 oz.

If the tank is a reusable tank, there are no check valves and system refrigerant can enter the tank as long as the system pressure is higher than the pressure in the tank.

Answer explanation

The correct answer is 'True'.

Refrigerant in vapor form is normally put into the system through the ____.

Answer explanation

The correct answer is: suction line

Refrigerant in liquid form is normally put into the system through the ____.

Answer explanation

The correct answer is: liquid line

When charging a system with vapor refrigerant from a refrigerant cylinder the cylinder will become ____.

Answer explanation

The correct answer is: cold

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.

Answer explanation

The correct answer is 'True'.

Glide is the range of temperatures/pressures in which a blended refrigerant will condense.

Answer explanation

The correct answer is 'True'.

Fractionation occurs when ____.

Answer explanation

The correct answer is: some of a blended refrigerant evaporates or condenses before the rest of the blend

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

Answer explanation

The correct answer is 'True'.