410A Questions

Question 1

Molina-Rowland Theory

Definition and Date

Answer 1

Theory that chlorine and bromine depleted the ozone layer

1974

Question 2

The year that HCFC’s will be phased out?

Answer 2

2030

Question 3

410A is what kind of Mixture?

Answer 3

Near-Azectropic

Question 4

410A can only be used in equipment designed for it?

True or False

Answer 4

True

Question 5

410A operates at Higher or Lower Pressures?

410A uses special cylinders, gauges and recovery equipment?
True or False

Answer 5

Higher Pressure

True

Question 6

Latent Heat

Answer 6

Causes a substance to change state without changing its temp

Question 7

Superheat

Answer 7

Refers as a vapor and above saturation temp

Question 8

Compression Ratio

Answer 8

Absolute suction pressure

Question 9

410A Compressors have a decreased or increased thickness wall?

Answer 9

Increased

Question 10

Compressors designed for R-22 should never be used with 410

True or False?

Answer 10

True

Question 11

R-22 Internal Pressure Relief

IPR

Answer 11

375-450 psig

Question 12

410A Internal Pressure Relief

IPR

Answer 12

550-625 psig

Question 13

Suction and Discharge pressures are with 410A(%)

Higher vapor heat capacity

Answer 13

50%-70%

Question 14

High Pressure Switch Opens at

Psig

Answer 14

610 psig + or - 10 psig

Question 15

High Pressure Switch Closes at

Psig

Answer 15

500 psig + or - 15psig

Question 16

The subcooled liquid in the receiver may do what depending on the surrounding temp of the receiver?

Answer 16

Lose or Gain

Question 17

Receiver Bypass is used for?

Answer 17

Bypass the liquid around the receiver and go directly to the liquid line and filter drier.

Question 18

The Bypass does what?

Answer 18

Prevents sub-cooled liquid from sitting in the receiver and losing its subcooling.

Question 19

Liquid Line Filter Driers no less than

Psig

Answer 19

600 psig

Question 20

Can Liquid Lines used for R-22 also be used for 410A?

Answer 20

Yes, If sized and cleaned properly

Question 21

The Flow Area in the Metering Device are designed to be

%

Answer 21

15% Smaller

Question 22

The Evaporator or Indoor coil should be removed when changing out existing equipment and replaced with a 410A model?
True or False?

Answer 22

True

Question 23

Service Pressure rating of(psig) needs to match

Some R-22 indoor coils can meet UL standards.

Answer 23

235 psig Always Confirm

Question 24

A Overcharge does what?

Answer 24

High side pressure increase

Question 25

When charging a 410A system in air conditioning mode you do what?

Answer 25

Put in as a Liquid

Question 26

Cylinders without dip tubes must be?

Answer 26

Tipped upside down to get the liquid removed

Question 27

When a Operating 410A system is running you charge on what side and as what?

Answer 27

Throttled in as a liquid on the low side

Question 28

Throttling Valve

Answer 28

To ensure the liquid is converted to a Vapor

Question 29

A manifold gauge can also be used as a throttling device?

True or False

Answer 29

True

Question 30

When trying to clear a sight-glass you can overcharge the system?
True or False

Answer 30

True

Question 31

Nitrogen Cylinders are shipped out at what?(psig)

Answer 31

2500 psig

Question 32

Once you shut off the electrical power you have to?

Answer 32

Lock out tag out

Question 33

A Cylinder of 410A should never get warmer then?

Answer 33

125F and 52C

Question 34

410A Recovery Cylinders must be rated for?(psig)

Answer 34

400 psig

Question 35

If ingestion occurs do not

Answer 35

Induce vomitting

Question 36

When using 410A use these for safety?

Answer 36

Appropriate gloves and safety glasses