Epa - Type 2 - Retail Ready

Front 1

What component is always replaced after a system is opened for service?

Back 1

Filter-driers

Front 2

What is the purpose of the moisture indicator in a sight glass?

Back 2

To permit a check of moisture content in the system.

Front 3

What does "back-seating" a suction valve do?

Back 3

Allows flow through the main line while closing the access port.

Front 4

What will non-condensables do to the pressures in a refrigerant circuit?

Back 4

Increase discharge pressure.

Front 5

What causes oil foaming in a system and where does it normally occur?

Back 5

Oil that is mixed with refrigerant will foam in the compressor crankcase.

Front 6

What system failures require taking an oil sample?

Back 6

Compressor burnout or if the unit has had a leak.

Front 7

A vacuum pump that is too large can cause what problem?

Back 7

It can cause moisture to freeze in the system

Front 8

Where is a receiver typically installed on a system?

Back 8

At the outlet of the condenser.

Front 9

What will be the boiling temperature of HFC-134a be at 0 PSIG?

Back 9

-15 degrees F.

Front 10

Is it a requirement that recovery machines contain an oil separator?

Back 10

No

Front 11

Which refrigerant is typically used on a residential split system air conditioner?

Back 11

HCFC-22

Front 12

Is the refrigerant leaving a receiver a liquid or a gas? Is it at a high or low pressure?

Back 12

Liquid, high pressure.

Front 13

What is the initial charging method of a system when the charge is specified at 70 pounds?

Back 13

Charged in liquid state.

Front 14

Is the receiver on the high or low side of a system?

Back 14

High side.

Front 15

What is the minimum recommended capability (measured in microns) of a vacuum pump used for evacuations?

Back 15

Should pull a vacuum of 500 microns.

Front 16

What is the pressure of a CFC-12 machine at 72 deg. F while the machine is idle?

Back 16

73 PSIG.

Front 17

What is the preferred unit of measurement for checking a deep vacuum?

Back 17

Microns

Front 18

Where is an accumulator located in a refrigeration system?

Back 18

On the suction line before the compressor.

Front 19

To prevent freezing of any moisture in a CFC-12 system, vapor should first be charged until the pressure is at what level?

Back 19

33 PSIG

Front 20

What gas should be used during an evacuation to increase pressure to prevent freezing?

Back 20

Dry nitrogen.

Front 21

What is the purpose of a compressor heater?

Back 21

To reduce the amount of refrigerant in the lubricating oil.

Front 22

How is moisture remaining from an evacuation removed from the refrigerant in a system?

Back 22

By the filter-drier.

Front 23

When may a technician recover only 80% of the refrigerant in a small appliance?

Back 23

In a system dependent recovery with a non-operating compressor.

Front 24

May a technician use a passive recovery machine for recovery from a domestic refrigerator?

Back 24

Yes

Front 25

What requirements are placed on recovery machines built after November 15, 1993?

Back 25

Must be able to recover 80% of the refrigerant if the compressor is inoperative or 90% if the compressor is operative. Must be EPA certified.

Front 26

When using a recovery machine manufactured after November 15, 1993, what percentage of the refrigerant must be recovered in a household refrigerator with an operating compressor? What percentage if the compressor is NOT operating?

Back 26

80%, 90%

Front 27

Is a certified technician responsible for future changes in EPA regulations?

Back 27

Yes.

Front 28

What type of certification is required to purchase CFC and HCFC refrigerants?

Back 28

Type 1

Front 29

What must be done with any regulated refrigerant vented from a graduated charging cylinder?

Back 29

It must be recovered.

Front 30

What is the easiest way to check the type of refrigerant used in a packaged rooftop system?

Back 30

By the equipment data plate.

Front 31

Refrigerant will recover fastest in which phase, liquid or vapor?

Back 31

Liquid

Front 32

Which refrigerant line should a recovery machine be attached to in order to recover liquid refrigerant from a system?

Back 32

To the liquid line.

Front 33

After a liquid recovery, what must be done with the vapor still in the system?

Back 33

Vapor recovery bust be performed.

Front 34

Recovering in a vapor phase reduces unwanted loss of what?

Back 34

Oil and unwanted contaminants from the system to the recovery machine and recovery drum.

Front 35

On a high pressure system recovery, should the recovery cylinder be heated or cooled?

Back 35

Cooled

Front 36

What must be done to a recovery machine when changing to a different refrigerant?

Back 36

Clean out all residual refrigerant, change oil, replace filters, evacuate machine by pump-out or another machine.

Front 37

What besides filters must periodically be changed out on a recovery machine?

Back 37

Oil

Front 38

Recovered refrigerant can contain oil and acids. Name another compound found in refrigerants?

Back 38

Moisture

Front 39

What is the water source for a condensing coil on a water-cooled recovery machine?

Back 39

Municipal water tap.

Front 40

What access location should you use when recovering from an air cooled system with its condenser several feet above the evaporator?

Back 40

Suction line

Front 41

What access location should you use when recovering from a system with its condenser below the evaporator?

Back 41

Liquid line

Front 42

Before using a recovery unit, the technician should check service valve positions and check the recovery unit oil level. What additional step must be taken?

Back 42

All solenoid valves should be open.

Front 43

What is the primary purpose for using hand valves or self-sealing hoses when using a gauge set?

Back 43

To prevent loss of refrigerant when connecting and disconnecting hoses.

Front 44

What can cause recovery equipment with a hermetic compressor to overheat when drawing a deep vacuum?

Back 44

No airflow over the compressor body or no suction gas flow over the internal motors, or a combination of the two.

Front 45

What is the reason for not operating a hermetic refrigeration compressor while it is in a deep vacuum?

Back 45

To prevent overheating the compressor motor.

Front 46

What is the reason for not starting a reciprocating compressor with its discharge service valve closed?

Back 46

To prevent overheating the compressor motor.

Front 47

When can a "system-dependent" recovery device be used?

Back 47

On small appliances as long as the device meets EPA standards and the technician adheres to the servicing procedures specified for the recovery equipment. Cannot be used on systems with more than 15 lbs. of refrigerant.

Front 48

What vacuum level must you reach when recovering from a system with 38 pounds of R-502 using a recovery machine manufactured in 1995?

Back 48

10 in. of Hg

Front 49

What is EPA's definition of a "major repair"?

Back 49

Any repair that involves the removal of the compressor, evaporator, condenser, or any auxiliary heat exchanger coil.

Front 50

Prior to making a major repair, what vacuum level must you pull when using recovery equipment manufactured in 1996 on a unit with 215 lbs. of CFC-12?

Back 50

15 inches of Hg.

Front 51

What vacuum level must you pull when using recovery equipment manufactured in 1992 when disposing of an appliance containing 12 lbs. of R-500?

Back 51

4 inches of Hg.

Front 52

Under what circumstances may a technician recover the CFC refrigerant in an appliance to atmospheric pressure only?

Back 52

If leaks are in the system or if recovery to target levels would contaminate the refrigerant.

Front 53

What procedure should be performed on an empty recovery cylinder before it is used for storing recovered refrigerant?

Back 53

It must be evacuated of all non-condensables.

Front 54

What may legally be done with the refrigerant recovered from a system in order to replace a condenser coil?

Back 54

Reused in the original system or transferred to another system with the same owner after it is checked so that it is free of non-condensables.

Front 55

When servicing an operating unit with a receiver, where should the recovery hoses be attached to the unit?

Back 55

To the Liquid line

Front 56

In order to recover from a system with parallel compressors, the individual compressors must be isolated. Why?

Back 56

It isolates the refrigerant that must be recovered from the rest of the system.

Front 57

Which refrigerant (s) require and equipment room monitor per ASHRAE Standard 15?

Back 57

All

Front 58

What protection is mandatory to protect a system against damage from excessive pressure?

Back 58

A pressure relief device.

Front 59

Are multiple relief valves connected in series or parallel?

Back 59

Parallel

Front 60

Why is the use of a regulator required when using dry nitrogen?

Back 60

To limit the outlet pressure of the nitrogen cylinder.