EPA Type 2

Question 1

What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level

Answer 1

A system with a large leak and system pressure of atmospheric

Question 2

High pressure appliances can be evacuated to atmospheric pressure when

Answer 2

Leaks make evacuation to the prescribed level unattainable

Question 3

EPA regulations state that maintenance, service, or repair involving the removal of the following components is major repair

Answer 3

Compressor, condenser, evaporator, auxiliary heat exchanger coil

Question 4

Refrigerant should be removed from the condenser outlet if the condenser is

Answer 4

Below the receiver

Question 5

When EPA regulations change regarding refrigerant usage

Answer 5

Technician can lose their certification or be fined if violating updated regulations even if unaware of changes

Question 6

If a refrigeration condensing unit is sittin idle in an ambient temperature of 86*F at a pressure of 93psig it must contain

Answer 6

R-12

Question 7

A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of

Answer 7

Low ambient temperature

Question 8

Recovering refrigerant from the discharge service valve if a compressor is known as

Answer 8

The pull method of recovery

Question 9

What might be an indication of a loss of charge in a fixed orifice A/C system

Answer 9

Increased evaporator superheat

Question 10

What is the smallest size leak which EPA regulations say must be repaired on an air cooled chiller servicing the A/C in an office building and containing a charge of 240lbs of r-22

Answer 10

3lbs per month

Question 11

High pressure appliances containing 100lbs of an hcfc other than r-22. Recover and recycling equipment manufactured after Nov. 15, 93 must be evacuated to a level of

Answer 11

10” hg

Question 12

An r22 evaporator operating at a pressure of 83psia and with a suction line leaving it at 52F is operating with __ if superheat

Answer 12

12 degrees

Question 13

EPA regulations require that all commercial and industrial process refrigeration containing more than 50lbs of refrigerant must be repaired when the annual leak rate exceeds

Answer 13

35%

Question 14

R22 unit containing 255lbs by weight of refrigerant charge is recovered down to 15” hg and after five minutes the pressure rises and levels off at 10” hg then

Answer 14

Recovery is complete

Question 15

Which of the following refrigerants is an hcfc

Answer 15

R22

Question 16

A systems compressor should never be __ when in a deep vacuum

Answer 16

Energized

Question 17

When replacing the compressor on a 50 ton system which contains a receiver, the charge can be

Answer 17

Pumped into the receiver for storage during service

Question 18

When brazing in refrigeration system accessories which use neoprene or rubber gaskets

Answer 18

Wrap a wet rag around the area to keep it cool

Question 19

For the fastest recovery of a system which should be recovered first

Answer 19

Liquid refrigerant from the receiver

Question 20

Unless plans are made to replace a system exceeding the max leak, repairs must be made in

Answer 20

30 days

Question 21

Non condensables will cause

Answer 21

Higher discharge pressures

Question 22

An overcharged system will operate

Answer 22

Less efficiently

Question 23

Which refrigerant is considered high or very high pressure refrigerant

Answer 23

Hfc134a

Question 24

What would be most thorough for leak testing

Answer 24

Mixture of trace r22 with nitrogen backed up to 300psig

Question 25

When using nitrogen to pressurize a system for leak testing always make sure to use

Answer 25

A regulator on the nitrogen tank

Question 26

What should one do to an empty A/C system after repairing a leak and before recharging it

Answer 26

Check the system for leaks

Question 27

A refrigeration system which has a txv will likely be __if it has 2*F of sun cooling in the liquid line, just after the condenser

Answer 27

Undercharged

Question 28

At which location is a low loss fitting on your manifold hose likely to prevent the most venting of refrigerant

Answer 28

At the king valve

Question 29

The purpose of a vacuum pump is to

Answer 29

Remove air and moisture from a system before charging it with refrigerant

Question 30

A/C system short cycling is normally caused by

Answer 30

The system being oversized for the home

Question 31

Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by

Answer 31

EPA approved equipment testing organization

Question 32

When dehydrating a system it should be evacuated to a level of

Answer 32

500 microns

Question 33

Recovering r500 from an A/C system containing 12lbs of charge, the unit must be recovered down to a pressure of

Answer 33

10" hg

Question 34

The purpose of a purge or pump out mode of a recovery machine is to

Answer 34

Help clear another refrigerant from the machine in order to avoid mixing refrigerants

Question 35

What can help reduce the time necessary to recover the refrigerant from a unit (3things)

Answer 35

Shorter hoses, cool the recovery cylinder, run the unit to warm it

Question 36

All refrigeration and HVAC systems are protected by a

Answer 36

Pressure relief valve

Question 37

According to EPA regulations, the refrigerant in a system containing 12lbs of refrigerant and an inoperative compressor can

Answer 37

Legally be recovered using passive methods

Question 38

How much refrigerant must leak out of a 2ton residential A/C system before EPA regulations require that the leak be fixed

Answer 38

Not required to be leak free

Question 39

If pulling a system down to the EPA required recovery level cannot be accomplished because of system leaks

Answer 39

It must be recovered down to at least 0psig

Question 40

What can be done with the refrigerant trace gas and nitrogen after the leak is found

Answer 40

Can be released to the atmosphere

Question 41

A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under

Answer 41

ASHRAE standard 15

Question 42

A new split system should be checked for leaks by

Answer 42

Pressurizing the system with r22 and an inert gas

Question 43

When recovering from a system with a refrigerant leak, recover to a level of

Answer 43

0 psig

Question 44

What happens to a refrigerant that is above the saturation temperature

Answer 44

It remains in a vapor state

Question 45

When using a recovery system manufactured after Nov. 15, 93 on a system containing 100lbs of r502 must be evacuated to

Answer 45

10" hg

Question 46

Industrial and process refrigeration units with a 50lb charge or more with an annual leak rate of __ or more must have leaks repaired

Answer 46

35%

Question 47

Refrigerants cfc r12, hcfc r22 and hfc 134a are classified as

Answer 47

A1

Question 48

A high pressure appliance containing 210lbs of refrigerant recovery and recycling equipment manufactured before Nov. 15, 93 must be evacuated to a level of

Answer 48

4" hg