Metering Devices Highlights

Question 1

Cap tube min internal diameter?

Answer 1

0.028

Question 2

Cap tube maximum ID

Answer 2

0.095

Question 3

Cap tube min length?

Answer 3

6’

Question 4

Cap tube max length?

Answer 4

18’

Question 5

Actuator is a carrier term for orifices?

Answer 5

Yes

Question 6

Orifice and cap tube low starting torque?

Answer 6

Yes

Question 7

How are hand expansion valves adjusted?

Answer 7

By hand dummy

Question 8

Are hand expansion valves for DX coils or flooded?

Answer 8

Flooded

Question 9

What kind of load is an aev best for?

Answer 9

Constant

Question 10

What size if machinery are aevs seen in?

Answer 10

Small, like a slurpee

Question 11

Do aevs Overfeed under load and starve under load?

Answer 11

Yes

Question 12

Does an AEV equalize when off?

Answer 12

Yes

Question 13

Low side float evaporator is?

Answer 13

Flooded

Question 14

Txv capacity increases with an increase in pressure drop

Answer 14

Yes

Question 15

Txv formula=

Answer 15

P1=P2+P3

Question 16

P1=

Answer 16

Bulb

Question 17

P2=

Answer 17

Evaporator pressure

Question 18

Type CP=

Answer 18

Air conditioning

Question 19

Type C=

Answer 19

Refrigeration

50 to -10F

Question 20

Type Z=

Answer 20

Low temp

0 to -40F

Question 21

Type X=

Answer 21

Xtra low

-40 to -100F

Question 22

Type N=

Answer 22

Adsorption

Question 23

Does adsorption have a built in MOP

Answer 23

No

Question 24

Where is a hydraulic element used

Answer 24

Chillers

Question 25

What temp sensor does an EEV use

Answer 25

A thermistor

Question 26

Air conditioning temp range/super heat

Answer 26

40-50F | Superheat 8-12F

Question 27

Refrigeration temp range/superheat

Answer 27

0-40F | Superheat 6-8F

Question 28

Low temp temp range/superheat

Answer 28

0 to -40F | Superheat 4-6F

Question 29

Mop???

Answer 29

Maximum operating pressure

Question 30

Mop protects what?

Answer 30

The compressor

Question 31

Ammonia TXV body material?

Answer 31

Steel body

Question 32

Thermal electric expansion valve, hoe does it open

Answer 32

Heat and a bimetal strip

Question 33

Thermal electric expansion valve uses bulb or thermistor???

Answer 33

A thermistor