Air conditioning testing part B Flashcards

1
Q

what % of all ozone is in the atmosphere

A

90%

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2
Q

what are some negative effects of thinner ozone

A

higher temperatures , increased cancer risks , increased eye cataracts , agricultural crop damage

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3
Q

the international treaty that controls the elimination and phase out of CFC and HCFC refrigerants is

A

the Montreal protocol

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4
Q

an approved refrigerant container is a storage cylinder that conforms to the specifications of the

A

Canadian transport commission

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5
Q

what is the ODP ( ozone depleting potential ) of R134A

A

0%

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6
Q

what international protocol agreement reached in 1997 was designed to reduce greenhouse gas emissions

A

Kyoto protocol

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7
Q

what is the maximum fill capacity of a refrigerant cylinder if the maximum exposed temperature is 122 F or 50 C

A

80%

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8
Q

what is the maximum fill capacity of a refrigerant cylinder if the maximum exposed temperature is above 122 F or 50 C

A

60%

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9
Q

before preforming any work on refrigerant systems you must

A

identify the type of refrigerant used in the system

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10
Q

when you recover refrigerant you

A

remove it from the system

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11
Q

when you Reuse refrigerant you

A

recharge a refrigerant with recovered refrigerant

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12
Q

when you Recycle refrigerant you

A

remove any contaminates such as moisture, acidity and particulate matter

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13
Q

when you Reclaim refrigerant you

A

send it to an outside facility that can restore it to a new product specification

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14
Q

why must non-condensable gas must not be mixed into the refrigerant system

A

it can cause higher than normal operating pressures , lack of lubricating oil distribution and possible component damage

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15
Q

when checking for air in recovered refrigerant you must

A

store the recovered refrigerant and entrapped air mixture at a constant temperature above 65 F ( 19 C ) for at least 10 hours and use a pressure gauge accurate to 1 psi

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16
Q

if vapour must be drained from a recovered refrigerant bottle when pressure checking for reusability you must

A

wait for 4 to 6 hours for the temperature to stabilize before rechecking

17
Q

what gas is used when pressure checking the system

A

dry nitrogen gas

18
Q

what is the best tool for determining the vacuum during a vacuum test

A

a micron gauge

19
Q

how do you know when the vacuum test is complete

A

when the micron gauge has reached 500 microns and is held for 5 min

20
Q

how are all refrigerant systems charged

A

by the weight of the system according to manufacture spec

21
Q

why must caution be taken when charging a CCOT system

A

it senses low side pressure so as you are charging the system the compressor will be cycling on and off during the process

22
Q

ass you are charging a CCOT system how do you know when the system has reached capacity

A

when the accumulator inlet line port becomes cool to the touch

23
Q

when retro fitting a system from R-12 to R-134A what components must always be replaced

A

receiver/dryer and or the accumulator

24
Q

when loosening fittings always make sure to use

A

a backup wrench to prevent damage

25
Q

after retrofitting a system to R-134A it will only require how much of a charge

A

80 % because the refrigerant capability is much greater than R-12

26
Q

when installing new o-rings

A

only use fresh refrigerant oil to lubricate the seals