Air conditioning testing part B Flashcards
what % of all ozone is in the atmosphere
90%
what are some negative effects of thinner ozone
higher temperatures , increased cancer risks , increased eye cataracts , agricultural crop damage
the international treaty that controls the elimination and phase out of CFC and HCFC refrigerants is
the Montreal protocol
an approved refrigerant container is a storage cylinder that conforms to the specifications of the
Canadian transport commission
what is the ODP ( ozone depleting potential ) of R134A
0%
what international protocol agreement reached in 1997 was designed to reduce greenhouse gas emissions
Kyoto protocol
what is the maximum fill capacity of a refrigerant cylinder if the maximum exposed temperature is 122 F or 50 C
80%
what is the maximum fill capacity of a refrigerant cylinder if the maximum exposed temperature is above 122 F or 50 C
60%
before preforming any work on refrigerant systems you must
identify the type of refrigerant used in the system
when you recover refrigerant you
remove it from the system
when you Reuse refrigerant you
recharge a refrigerant with recovered refrigerant
when you Recycle refrigerant you
remove any contaminates such as moisture, acidity and particulate matter
when you Reclaim refrigerant you
send it to an outside facility that can restore it to a new product specification
why must non-condensable gas must not be mixed into the refrigerant system
it can cause higher than normal operating pressures , lack of lubricating oil distribution and possible component damage
when checking for air in recovered refrigerant you must
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
if vapour must be drained from a recovered refrigerant bottle when pressure checking for reusability you must
wait for 4 to 6 hours for the temperature to stabilize before rechecking
what gas is used when pressure checking the system
dry nitrogen gas
what is the best tool for determining the vacuum during a vacuum test
a micron gauge
how do you know when the vacuum test is complete
when the micron gauge has reached 500 microns and is held for 5 min
how are all refrigerant systems charged
by the weight of the system according to manufacture spec
why must caution be taken when charging a CCOT system
it senses low side pressure so as you are charging the system the compressor will be cycling on and off during the process
ass you are charging a CCOT system how do you know when the system has reached capacity
when the accumulator inlet line port becomes cool to the touch
when retro fitting a system from R-12 to R-134A what components must always be replaced
receiver/dryer and or the accumulator
when loosening fittings always make sure to use
a backup wrench to prevent damage
after retrofitting a system to R-134A it will only require how much of a charge
80 % because the refrigerant capability is much greater than R-12
when installing new o-rings
only use fresh refrigerant oil to lubricate the seals
