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Question 1

Current relay type of wire and resistance

Answer 1

Heavy wire low resistance

Question 2

Current relay S=?

Answer 2

S= start

Question 3

Current relay L=?

Answer 3

L=Line voltage

Question 4

Current relay M=?

Answer 4

M=run

Question 5

In a current relay what position are L and S

Answer 5

Normally open

Question 6

Potential relay what is it called when the coil is energized?

Answer 6

Pick up voltage

Question 7

What shuts off a potential relay secondary coil after being energize?

Answer 7

Back EMF

Question 8

What kind of resistance does a solid state relay have?

Answer 8

Low resistance

Question 9

Order of calculating open compressor pulleys?

Answer 9

2 sames on top divided by the one by itself

Question 10

Liquid charge and cross charge have a MOP

Answer 10

NO

Question 11

Height limit for evaporators away from condensing units

Answer 11

20 feet

Question 12

Hot gas bypass line sizing should not exceed a

Answer 12

6-12 psi pressure drop

Question 13

Bypass pressure activation

Answer 13

58 psig

Question 14

How does hot gas bypass valve open

Answer 14

Open of differential pressure ORD

Question 15

When using hot gas bypass for capacity control what must be used

Answer 15

De superheating TXV is liquid injector valve

Question 16

Should hot gas bypass line be insulated?

Answer 16

Yes

Question 17

Is hot gas bypass the last unloader

Answer 17

Yes

Question 18

What kind of valve operates heat reclaim

Answer 18

Pilot operated valve

Question 19

Are head pressure control valves necessary when using heat reclaim valves

Answer 19

Yes

Question 20

Epr and cpr shouldn’t be together

Answer 20

More often than not

Question 21

When does a CPR close

Answer 21

Closes on a rise of outlet pressure

Question 22

CPR is normally?

Answer 22

Open

Question 23

What amps is the cpr set for

Answer 23

FLA or 10% higher than RLA

Question 24

Where is a CPR installed?

Answer 24

Always downstream of other control devices

Question 25

EPR opens...

Answer 25

On a rise of inlet pressure

Question 26

What is a common hold back valve?

Answer 26

An EPR

Question 27

Can an epr be considered a 2 temperature valve?

Answer 27

Yes

Question 28

What does an EPR maintain

Answer 28

A minimum evaporator pressure

Question 29

Epr keeps a constant pressure

Answer 29

No it doesn’t | It limits the minimum evaporator pressure

Question 30

Where must a EPR be installed

Answer 30

Upstream of all suction controllers devices

Question 31

What is a hear pressure control also known as

Answer 31

A low ambient control LAC

Question 32

Head pressure control helps...

Answer 32

Oil return to the comp | Prevent TXV hunting

Question 33

OROA=

Answer 33

Headmaster

Question 34

Head pressure control opens...

Answer 34

On a rise of outlet pressure

Question 35

Head pressure control is usually used on temperature operated systems or pressure controlled systems

Answer 35

Temperature

Question 36

Valve selection pressure drop should be in between...

Answer 36

2 abs 14psig

Question 37

2 types of receivers

Answer 37

Flow though | Surge type

Question 38

Receivers capacity and temperature

Answer 38

90% at 90F

Question 39

How much % must a distributor be able to handle

Answer 39

50-200%

Question 40

Oil filters must be mounted...

Answer 40

Vertically

Question 41

At what pressure drop should you replace a filter?

Answer 41

40-50psig

Question 42

3 types of oil separators

Answer 42

Helical Impingement Coalescing

Question 43

Mixing valve mixed how many things

Answer 43

2

Question 44

Diverted valve

Answer 44

1in 2 out

Question 45

Direct acting solenoid valve is how small

Answer 45

1/4 or less

Question 46

3 way solenoid valve/mixing valve Heat reclaim Split condenser and 2 more

Answer 46

Hot gas defrost | Pilot control valve

Question 47

3 types of desiccant

Answer 47

Loose fill Compressed beads Solid core

Question 48

Adjust clockwise an epr what happens

Answer 48

Increase set point of valve

Question 49

Clock wise on a cpr

Answer 49

In increases