Valves

Question 1

LAC check valve goes where

Answer 1

LAC and receiver

Question 2

Function of headmaster

Answer 2

Maintain constant condenser pressure during low ambient conditions

Question 3

Hot gas bypass regulator are modulating valves that

Answer 3

Close on rise of outlets same a cpr

Question 4

Reverse acting low pressure control will

Answer 4

Open on rise of pressure

Question 5

Discharge or hot gas bypass regulator used for capacity control will open when the suction pressure drops below the set point

Answer 5

Yes

Question 6

CPR is

Answer 6

CRO

Question 7

Net force that opens the EPR

Answer 7

Inlet pressure minus spring pressure

Question 8

Net force causing cpr valve to open

Answer 8

Spring pressure minus outlet

Question 9

A 3 wire hook up on an oil failure control is for

Answer 9

Line voltage

Question 10

Defrost differential regulator

Answer 10

It reduces the pressure in condenser recover and liquid line header so defrost header is higher pressure than liquid header pressure in defrost

Question 11

Hot gas bypass regulators used to regulate condenser pressure during low ambient pressure

Answer 11

False

Question 12

Best reason for including a pump down

Answer 12

Save compressor

Question 13

If headmaster control loses its charge during low ambient

Answer 13

Low head pressure

Question 14

Headmaster changes modulates between open and closed according to

Answer 14

Recover pressure

Question 15

A 4 wire hookup on oil failure is for

Answer 15

Pilot duty

Question 16

115 and 230 terminals in oil failure do they have separate circuits

Answer 16

False

Question 17

Best desiccant for removing moisture

Answer 17

Molecular sieve

Question 18

Hot gas bypass valves are used for

Answer 18

Capacity control

Question 19

Is OROA the same at headmaster

Answer 19

True

Question 20

OTD is non adjustable

Answer 20

Yes

Question 21

I’d head pressure falls

Answer 21

Oil logging n evaporator
Increases condenser efficiency
Lower comp ratio
Lower amp draw