Advance Refridge

Question 1

What would be the two function of the evaporator in a refridgeration system?

Answer 1

Remove heat + Dehumidify

Question 2

System with TXV what do you charge by?

Answer 2

Subcool

Question 3

System wih Fixed abore what do you charge by?

Answer 3

Superheat

Question 4

Find boiling temp of evaporator?

Answer 4

Superheat subtracted by suction line temp

Question 5

What is the superheat of the evaporator you’re looking for?

Answer 5

8-12 degree comfort cooling

Question 6

Excessively high superheat?

Answer 6

Starving Evaporator

Question 7

Low superheat?

Answer 7

Low on charge, flooding, and or undercharge

Question 8

How does a medium temp evaporator defrost?

Answer 8

(Off cycle) defrost with ambient temp

Question 9

How’s defrost always initiated?

Answer 9

By time

Question 10

High subcool means what?

Answer 10

Overcharge

Question 11

Which one has low condensing temps? Air cool or water cool?

Answer 11

(Water cool) condenses at 100-105 degree

Question 12

If the system is overcharge what does it mean?

Answer 12

High subcool, means its ocer 10-15 degree (txv)

Question 13

3 things that happen in a condenser?

Answer 13

Desuperheat, condense, and subcool

Question 14

Reciprocating compressors discharge temp is what?

Answer 14

200-220

Question 15

What compressor uses pistons and valves?

Answer 15

Reciprocating compressor

Question 16

Compressor can only compress what?

Answer 16

Vapor pump

Question 17

TXV is designed to maintain what?

Answer 17

Constant superheat

Question 18

AEV maintains what?

Answer 18

Pressure

Question 19

Wihere do you mount the sensing bulb?

Answer 19

Suction line near the evaporator

Question 20

Cap tube and or fixed bore controls refridgeration flow by what?

Answer 20

Friction causing pressure drop getting tempature drop

Question 21

If close to superheat what should your setpoint be?

Answer 21

8-12 degree for cap tube and fixed bore

Question 22

On a TXV whats the part that causes needles and valves to move?

Answer 22

Diaframe

Question 23

What is the component that protects the system?

Answer 23

Low pressure control

Question 24

Can low pressure control be used as a thermostat?

Answer 24

Yes

Question 25

Whats the component that has a magnetic coil used to open and close refridgerant line?

Answer 25

Solenoid valve

Question 26

What component in the system filters any contaminents?

Answer 26

Filter driers

Question 27

Loads in a refridgeration system are wired in?

Answer 27

Parallel

Question 28

What’re the two reasons we insulate suction line?

Answer 28

Prevent superheat and condensation

Question 29

Material used for ice machine?

Answer 29

Aluminum or stainless steel

Question 30

Ice machine uses what cor defrost method?

Answer 30

Hot gas

Question 31

What type of ice maker have no defrost?

Answer 31

Flakers (continously making ice)

Question 32

Three positions of a commerical valve?

Answer 32

Back seat, mid seat, front seat

Question 33

TXV increase load what happens?

Answer 33

Txv responds by opening up increasing tempature

Question 34

AEV increase load what happens?

Answer 34

AEV restricts the flow and shuts down

Question 35

Water cool condesne, how much gallons needed?

Answer 35

3 gpm/ Ton

Question 36

Outdoor condensing unit with cooler outdoor ambient temp, what shoukd you have?

Answer 36

(Head pressure control). For low ambient temp

Question 37

In a refridgeration system why do you want pump down fracture?

Answer 37

Service low side of the system and easier compressor startup

Question 38

Standard high efficiency for R-22 add what to the condense at?

Answer 38

Ambient + 30

Question 39

Standard high efficiency for R-410A add what condense at?

Answer 39

Ambient + 10-15

Question 40

How does cap tube or fix bore react to overcharge?

Answer 40

High pressure in high pressure out

Question 41

How would a TXV react to overcharge?

Answer 41

TXV will see excessive head pressure and close and back and fourth