#3 EPA 608 Type II

An operating unit that has a receiver/storage tank requires refrigerant system service. When servicing the unit;

• the compressor should be valved off.

• liquid refrigerant should be recovered last.

• refrigerant should be pumped down to and isolated in the receiver.

• a gauge pressure of "0"psi should be achieved by venting.

During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as;

• R-410A.

• R-22.

• Air.

• Nitrogen.

How long do owners or operators of an appliance with a full charge of 50 or more pounds of ozone­ depleting refrigerant have to retire an appliance if the replacement uses a refrigerant that is exempt from the venting prohibition?

• 3 months

• 6 months

• 12 months

• 18 months

How long must owners and operators of regulated appliances normally containing 50 or more pounds of HCFC refrigerant keep records of leak inspections, initial leak verification and follow-up verification tests?

• 2 years

• 3 years

• 5 years

• Life of the appliance

How would you remove moisture from refrigerant in a system?

• Purge the condenser.

• Drain the oil separator.

• Reduce water flow to the condenser.

• Use a filter drier.

It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it;

• often contains moisture.

• requires a minimum of 10 psig.

• is toxic when released into the atmosphere.

• requires a pressure regulator.

Pressure relief valves can only be installed;

• in series.

• in parallel.

• vertically.

• horizontally.

Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following?

• Water

• Oil

• Refrigerant

• Non-condensables

Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. The refrigerant;

• may be charged back into the system.

• may be sold as is to another equipment owner.

• must be reclaimed.

• must be destroyed.

To determine if the system is leaking more than the allowable rate, the EPA allows the use of which one of the following methods to determine the full charge?

• Use of the calculations based on power consumption, in kWh.

• Use of the calculations based on compressor horsepower

• Use of calculations based on component and pipe sizes.

• Use of the calculations based on the BTU capacity of the system.