Accessories Flashcards

1
Q

What do compressor protection devices monitor ?

A
  1. Current draw on compressor motor
  2. Head pressure
  3. Temperature of the compressor done
  4. Temperature of the discharge line
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2
Q

What is mounted to the compressor shell near the motor terminals to prevent over heating ?

A

Thermal overload device

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3
Q

What does a discharge line pressure switch do ?

A

Turns off system if head pressure gets to high

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4
Q

What is a discharge line thermostat ?

A

Senses discharge line temperature and (opens on rise in temperature) to turn off the system

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5
Q

What in an accumulator helps to return oil to the compressor ?

A

Aspirator

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6
Q

What is a thermal insulator ?

A

Oil

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7
Q

What is an oil separator

A

Removes oil from high pressure refrigerant Vapor. Diameter is larger than the discharge line.

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8
Q

Oil level regulator does what ?

A

Oil control device that regulates the level of oil within a compressor using a float mechanism

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9
Q

Oil safety control does what ?

A

Will shut off electrical power to the compressor if oil pressure drops below normal for a certain period of time.

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10
Q

Explain EPRV

A

Open on rise of inlet pressure
Prevent evaporator pressure from falling below a predetermined value.
(Can operate multiple boxes with different set points)

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11
Q

Explain CPRV

A

(Close on rise of outlet pressure)
Set to limit the suction pressure to a pre determined maximum.

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12
Q

Explain Distributor tubes

A

Distribute refrigerant in parallel passes minimizing pressure drop.
Medium and large sized coils.

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13
Q

Explain hot gas bypass valve

A

Method of capacity control.
(Impose a false load on the evaporator allowing some hot discharge gas to enter after the TXV)

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14
Q

Explain impingement oil separator

A

Impingement oil separators use screens in the upper half to cause fine particles of oil to collect and form larger ones.

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15
Q

Explain helical oil separator

A

Depend on the interior shell design to force gas/oil mixture along a spiral path. Creates centrifugal force which forces oil to outside and collect/drain to the float valve

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16
Q

Explain coalescing oil separator

A

Passed through filter of exceptionally pure, extremely fine glass fibres and form a capturing matrix. Causes molecules to collide and force drained by gravity into the sump

17
Q

Types of relief valves ?

A

Fusible plug
Spring loaded relief valve
Rupture disc

18
Q

Purpose of a heat exchanger in the system ?

A

Superheat and sub cool opposing sides of system

19
Q

Headmaster control does what ?

A

Open on rise of outdoor ambient
Holds back some refrigerant to raise condensing pressure