Type 1 Flashcards

1
Q

EPA definition of a small appliance

A

Products, manufactured, fully charged, and hermetically sealed in a factory containing 5 pounds or less of refrigerant 

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2
Q

Recovery equipment used during maintenance, service, or repair, must be certified by?

A

EPA approved laboratory 

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3
Q

System dependent or passive recovery equipment  is limited to a maximum of _____ lbs

A

15 lbs

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4
Q

Self-contained recovery devices for use with small appliances containing CFCs, HCFCs, HFC and HFO must be able to recover ___% of the refrigerant when the compressor is operating or achieve ____ inches of vacuum.

A

90% or 4 inches of vacuum  under the conditions of AHRI740

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5
Q

What type of hoses should be used to minimize the release of refrigerant?

A

Hoses with manual or self sealing valves on the ends

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6
Q

When filling a charging cylinder with regulated, refrigerant, must vented refrigerant off the top be recovered?

A

YES

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7
Q

When servicing a small appliance  and a leak is found, must it be repaired?

A

It is not mandatory, but is recommended to do so whenever possible 

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8
Q

Can you mix refrigerants in an appliance or recovery cylinder?

A

NO, it is unacceptable

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9
Q

If the pressure temperature relationship of a recovery cylinder does not match, what should be done with the refrigerant?

A

It should be turned into a reclamation facility

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10
Q

What may happen if refrigerants are mixed in a recovery cylinder?

A

The reclamation facility may refuse to accept or charge, extra for processing and destroying it

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11
Q

Should piercing valves be left on appliances after service?

A

When installing, they should be leak, tested before proceeding with recovery. Because they leak overtime, they should not be left on after completion of the repair. 

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12
Q

What can help free refrigerant that might be trapped under the oil in the compressor crank case?

A

Heat (with a heat gun) and strike it with a rubber mallet

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13
Q

When using the system dependent (passive) recovery process, and the compressor does not run, what side of the system must be accessed for refrigerant recovery?

A

Both high and low

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14
Q

When, using self-contained (active) recovery device, and there is large volume of noncondensible gas in the refrigerant, what can result?

A

Excessive pressure can occur on the high side of the recovery machine and in the recovery cylinder

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15
Q

During system, recovery and repair, what does a pungent odor detected in the refrigerant normally indicate?

A

Compressor burn out

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16
Q

What happens to CFC and HCFC refrigerants at high temperatures?

A

They can decompose into phosgene, gas, hydrochloric, and or hydrofluoric acids

17
Q

Refrigerants are _____ then air and displace oxygen which can cause suffocation during a large refrigerant leak

A

Heavier