HVACR System Installation and Start-Up Residential Unit 10
The quickest method to charge a system is to charge only vapor.
The correct answer is 'False'.
When adding refrigerant in liquid form into the high-side of the system, the system motor/compressor assembly is running.
The correct answer is 'False'.
A manufacturer's charging chart may be used when available to determine the correct charge for a system.
The correct answer is 'True'
Glide is the range of temperatures/pressures in which a blended refrigerant will condense.
The correct answer is 'True'.
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.
The correct answer is 'True'.
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.
The correct answer is 'True'.
Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.
The correct answer is 'True'.
When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly is running.
The correct answer is 'True'.
When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.
The correct answer is 'True'.
If 22 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 24 lb. 12 oz. before any is added, what will be the supply cylinder weight after the system has been charged?
The correct answer is: 22 lb. 6 oz.
If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?
The correct answer is: 24 lb. 6 oz.
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?
The correct answer is: 7 lb. 11 oz.
When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?
The correct answer is: Charge as a liquid through the low side using a restrictor.
Charging a refrigeration system refers to ____.
The correct answer is: adding refrigerant to a system
A graduated cylinder charging device is a device that ____.
The correct answer is: all of the above
When charging a system with vapor refrigerant from a refrigerant cylinder the cylinder will become ____.
The correct answer is: cold
If a critically charged refrigeration system is over charged, which of the following is a likely result?
The correct answer is: increased operating pressures
Refrigerant in liquid form is normally put into the system through the ____.
The correct answer is: liquid line
Fractionation occurs when ____.
The correct answer is: some of a blended refrigerant evaporates or condenses before the rest of the blend
Refrigerant in vapor form is normally put into the system through the ____.
The correct answer is: suction line
When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ____.
The correct answer is: upside down
