Epa Type Ii

Front 1

heat pumps that use R- 410A should be leak check with

Back 1

pressurized nitrogen

Front 2

Heat pumps that have been retrofitted from R-22 to R-407c should be leak checked with

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pressurized nitrogen

Front 3

To change the compressor on a system containing R -410A you must isolate the compressor then

Back 3

Evacuate the isolated section of the system to atmospheric pressure and hold if system pressure does not rise remove the compressor

Front 4

the method to change a system that has a normal charge of 80 pounds is to charge with

Back 4

Liquid through the liquid line service valve

Front 5

After installation of a field piped R- 410A split heat pump the unit should first be

Back 5

Pressurized with nitrogen then leak checked

Front 6

Pressure relief valves must not be

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Installed in series

Front 7

When charging an R12 refrigeration system that uses a water-cooled condenser you must first charged with Vapor to a pressure of at least ______before switching to liquid charging

Back 7

35 PSIG

Front 8

Your recovery recycling machine has R22 refrigerant in it you now have to recover refrigerant from a unit with R-410A what must be done before your recovery unit can be used to recover R- 410A?

Back 8

the recovery unit must be EPA certified for us with r 410 a the recovery tank must be designed for the pressure of R 410 a the filter and lubricant in the recovery unit must be charged and the recovery unit evacuated( all of the above )

Front 9

After reaching the required recovery vacuum on a system you must

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Wait to see if the system pressure Rises indicating that there is still refrigerant in liquid form or refrigerant trapped in the oil

Front 10

In a refrigeration system the component directly following the evaporator is the

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Accumulator

Front 11

A reciprocating compressor should not be energized

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The discharge service valve is closed

Front 12

R410a requires a high pressure manifold gauge and hose that they must have a

Back 12

4000 PSIG burst pressure 800 PSIG working pressure

Front 13

The refrigerant pressure inside an R 410 a unit which is at room temperature and not operating is

Back 13

Approximately 210 PSIG

Front 14

Every air conditioning and refrigerating system should be protected by a

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Pressure relief device

Front 15

To charge the compressor on a system containing 40 pounds R- 500 using a recycling machine that was manufactured AFTER November 15th 1993 you must isolate the compressor then

Back 15

Evacuate the isolated section of the system to 10 inches of vacuum and hold if system pressure does not rise remove the compressor

Front 16

When inspecting a system for leaks you should look for

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Traces of oil

Front 17

When a new system has been assembled the first thing to do is

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pressurize the system with an inert gas and leak check

Front 18

R-410A is different from other ASHRAE 400 series non azeotropic blends because

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R-410A behaves as a near azeotropic refrigerant and can be topped off

Front 19

Manifold gauge set hoses should have self-sealing connectors or hand valves to

Back 19

Minimize the release of refrigerant when the hoses are connected and disconnected

Front 20

When using recovery or recycling equipment that was manufactured AFTER November 15th 1993 must evacuate a system containing MORE than 200 pounds of CFC 12 to_____ before making a major repair

Back 20

15 inches of HG vacuum

Front 21

With an air-cooled condenser on the roof of a building in the evaporator on the first floor recovery should first occur

Back 21

From the liquid line entering the evaporator

Front 22

Never use oxygen or compressed air to leak check Hardware because R 410A can

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Explode when mixed with air or oxygen

Front 23

Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation method however it

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Can be dangerous if not used with a pressure regulator

Front 24

A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because

Back 24

The motor needs the flow of refrigerant through the compressor to provide motor Cooling

Front 25

The proper charging method for Blended non isotropic refrigerant 400 series is to use a remove the charge from the cylinder as a

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Liquid

Front 26

When a refrigerant Trace gas becomes absolutely necessary which of the available refrigerant should be used to identify a leak?

Back 26

HCFC-22

Front 27

After refrigerant liquid has been removed from a system any remaining vapor is

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Condensed by the recovery system

Front 28

an oil sample should be taken when

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the compressor has a burnout

Front 29

In a refrigeration system with a TXV or other type of throttling device the component directly following the condenser is the

Back 29

Receiver

Front 30

Recovered refrigerant may contain which of the following?

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Acids moisture & oils (all of the above )

Front 31

The back seating of a suction shutoff valve will close the

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Gauge port

Front 32

Which repair would always be considered major under EPA's regulations?

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Replacement of an evaporator coil

Front 33

R410a require Certified Recovery and recycling machines rated for at least

Back 33

400 PSIG

Front 34

A compressor heater is used to

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Reduce the amount of refrigerant in the lubricating oil

Front 35

Your recovery recycling machine has r502 refrigerant in it you now have to recover refrigerant from a unit with R22 what must be done before the R-22 refrigerant can be recovered recycled?

Back 35

Recover as much of the r502 from The Recovery Unit as possible change filter and evacuate

Front 36

The faster way to recover refrigerant from a system is to remove it in the _____ phase?

Back 36

Liquid

Front 37

Before using every covery unit to remove a charge what steps should be taken

Back 37

Check service valve positions check the oil level in The Recovery Unit evacuate Recovery Unit and recovery tank(all of the above )

Front 38

A deep vacuum is usually measured in

Back 38

Microns

Front 39

Before transferring refrigerant to an empty cylinder?

Back 39

The cylinder should be evacuated to avoid mixing air with the recovered refrigerant

Front 40

To recover liquid refrigerant you must connect one hose to the

Back 40

Liquid line

Front 41

A system can be evacuated to only atmospheric pressure when

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Leaks in the Appliance make evacuation to the prescribed level unattainable

Front 42

A system can be evacuated to only atmospheric pressure when

Back 42

Leaks in the Appliance make evacuation to the prescribed level unattainable

Front 43

The vacuum pump used to evacuate a system should be capable of pulling a vacuum of

Back 43

500 microns

Front 44

While r410a is a high pressure refrigerant it can be stored in the back of your service van as long as

Back 44

The temperature inside the vehicle does not exceed 125F this is the same guidance given for R22 and other common refrigerant

Front 45

When under a deep vacuum the motor winding of a hermetic Refrigeration compressor

Back 45

Will overheat only if the crankcase heater is energized

Front 46

Which statement is not true about Recycling and Recovery equipment manufactured after November 15th 1993?

Back 46

it must have an oil separator

Front 47

When are you getting it is opened for servicing the______ should always be replaced

Back 47

Filter drier

Front 48

When servicing an operating unit that has a receiver storage tank the

Back 48

Refrigerant should be recovered into the receiver

Front 49

Use_____ to remove ice from a sight glass

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An alcohol spray

Front 50

The refrigerant pressure inside an R12 unit which is at room temperature and not operating is

Back 50

Approximately 74 PSIG

Front 51

You are going to service a newer residential split system air conditioner you would expect to find the system charged with which refrigerant?

Back 51

R-410A

Front 52

A routine maintenance tasks which must be performed on refrigerant recycling machines is to

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Change filter in compressor oil (if any)

Front 53

refrigerant should be removed from the condenser Outlet if the

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condenser is below the receiver

Front 54

when evacuating a system the use of a large vacuum pump could

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cause trapped water to freeze

Front 55

On refrigeration units that use an open compressor the_____ is most likely to leak if the unit is not used for several months

Back 55

Rotating shaft seal

Front 56

The primary water source for cooling the condenser of a water cooled Recovery Unit is

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local Municipal Water Supply

Front 57

when using recovery and recycling equipment manufactured BEFORE November 15th 1993 technicians must evacuate a unit that has a normal charge of 10 pounds of CFC 500 to ______ before disposing of the system

Back 57

4 inches of Hg vacuum

Front 58

the evaporation temperature of R 410A at 100 PSIG is about

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30°F

Front 59

Noncondensables in a system cause a

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Higher discharge pressure

Front 60

R 410 A requires recovery tanks rated for at least

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400 PSIG

Front 61

The recovery rate can be increased by

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Packing the recovery vessel in ice

Front 62

Oil foaming usually occurs in the

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Compressor

Front 63

During the evacuation of a system that contains large amounts of moisture it may be necessary to increase pressure in the system with_____ to counteract the freezing of the moisture

Back 63

Nitrogen

Front 64

Prior to replacing the condenser coil in a high pressure system the refrigerant was recovered and stored in a refillable cylinder the refrigerant

Back 64

can probably be charged back into the system

Front 65

The evaporation temperature of R134a at 0 PSIG is

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-15°F

Front 66

The EPA regulations require that any appliances containing more than 50 pounds of refrigerant except for commercial and Industrial process Refrigeration must be repaired when the leak rate exceeds_____ of the charge per year

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15%

Front 67

The EPA regulations require that leaking commercial or industrial process Refrigeration equipment must be repaired when the leak rate exceeds_____ of the charge per year

Back 67

35%

Front 68

You are going to service an older residential split system air conditioner you would expect to find the system charged with which refrigerant

Back 68

R-22

Front 69

For what refrigerant is an equipment room Refrigeration monitor required under ASHRAE standard 15?

Back 69

R-123

Front 70

Heat pumps that use R134A should be leak checked with

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Pressurized nitrogen

Front 71

On a high pressure system______ is an indicator of a possible leak

Back 71

excessive super heat

Front 72

system dependent recovery equipment cannot be used with

Back 72

Appliance contains over 15 pounds of refrigerant

Front 73

moisture is removed from a system by

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using a filter drier

Front 74

which component is not part of the low side of the system

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Receiver

Front 75

Soap bubble testing is used

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To pin point refrigerant leaks

Front 76

Refrigerant leaves the receiver of a system as a

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High pressure liquid

Front 77

The recovery of refrigerant from a system as a vapor only will minimize the loss of

Back 77

Oil