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Accessories, Piping, Refrigerant & Oils > Accessories Ppt notes page 1+2 > Flashcards

Accessories Ppt notes page 1+2 Flashcards

1
Q

What is the purpose of a filter drier?

A

To filter refrigerant from particles such as dirt, metal, or chips

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2
Q

A ______-line drier is permanent and must be replaced every time the system _____

A

liquid line drier

opens

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3
Q

Suction line drier - used on service calls when putting in a new ___________ you add it to the suction line to ________ the compressor. It is for ___________ use.

A

compressor

protect

temporary

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4
Q

_______ is the process in which substance accumulated on the surface of a solid forming a thin film one molecule thick.

Example: activated charcoal can adsorb certain gases

A

Adsorb

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5
Q

_______ is the process in which a substance is dissolved into another substance

Example: water absorbs ammonia in a natural chemical process

A

absorb

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6
Q

Filter Drier Components;

_______ collect foreign matter

_______ Is a material that removes and traps moistures and acids in the refrigerant liquid

A

Strainers

Desiccant

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7
Q

Filter Driers; Types of Desiccants used:

  1. _____ gel: molecular sieve (adsorbent substances)
  2. _______ charcoal: Acid/Wax removal
  3. Activated ________ : Acid removal
  4. Newest type: _________
A
  1. silica gel
  2. Activated charcoal
  3. Activated Alumina
  4. Zeolite
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8
Q

Refrigerant drying capacity:

  1. Normally rated at approx ___F to _____F
  2. will maintain a systems water content below ___PPM for most refrigerant
  3. Drier size is based on a systems ________
  4. If filter drier is different temp then there is ____ gas and it is not operating correctly
A
  1. 75F to 125F
  2. 15PPM
  3. capacity
  4. flash gas
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9
Q

Filter Driers and Refrigerants:

  1. Most CFC and HCFC refrigerants should be dried to a maximum allowable moisture content of ____PPM
  2. Most HFC refrigerants should be drier to a max allowable moisture content of ___PPM
  3. Moisture content exceeding these levels causes system _________ which results in oil breakdown, sludge, motor burnouts, copper plating
A
  1. 15PPM
  2. 25PPM
  3. System contamination
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10
Q

Drier Installation: Brazing;

  1. No cleaning required if ____ remain on until ready to be brazed
  2. Heat rapidly and direct flame away from the _____
A
  1. caps on

2. shell

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11
Q

Drier Installation: Flare connection;

Keep drier _____ until ready to seal the system

A

capped

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12
Q

Liquid line drier purpose;

  1. Protects components from effects of ________
  2. Removes solids to prevent _______ and prevent acid ______
A
  1. Moisture

2. Blockage and Acid buildup

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13
Q

Liquid line drier: Location;

  1. *Installed as close to _____ inlet as possible. Should be ___________ to any system
  2. Driers are ________ as indicated by arrow
  3. Normal operation no ____ across the drier
A
  1. evap inlet, permanent to any system
  2. directional
  3. TD
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14
Q

Suction Line Drier: Construction;

  1. Similar to ______ ____ drier
  2. Normally _______ size than liquid line drier
  3. has ______ valves for P/D testing
A
  1. liquid line drier
  2. larger
  3. access valves
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15
Q

Desiccants use a combination of;

2.

3.

A
  1. molecular sieve
  2. charcoal
  3. activated alumina
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16
Q

Suction Line driers: Textbook answers;

  1. _________ use only
  2. To protect new __________ only
  3. Must go back to check if there is too much ______ drop or go back to ______ it if is no longer required
A
  1. temporary
  2. compressor
  3. pressure drop, remove it
17
Q

Suction Line Drier: Application;

  1. Used after a _____ ________or severe system contamination for removal of acids, wax, sludge, and moisture
  2. Installed as close to comp _____ as possible
  3. Removal or replacement is determined by ______ ____ across the assembly or after ____hrs of operation
A
  1. motor burnout
  2. compressor inlet
  3. pressure drop, 72hours
18
Q

Moisture Indicating sight glass: Purpose;

  1. Indication of ref ______
  2. Moisture content of __________
  3. Indication of _____ gas
  4. Reading of _______ indication
  5. Ideal liquid temp approx ___F to ___F
  6. Installed upstream of downstream of ____
  7. _______ indicators are suitable for CFC, HCFC, and HFC refrigerants
A
  1. charge
  2. refrigerant
  3. flash gas
  4. moisture indication
  5. 75F to 90F
  6. upstream or downstream of drier
  7. moisture indicators
19
Q

Sight glass installation: Location;

  1. Installed as close to _______ device as possible to indicate ____ gas
  2. Installed at the _________ unit to assist in refrigerant charging
A
  1. metering device, indicate flash gas

2. Condensing unit

20
Q

Suction Line Accumulator;

  1. Also known as suction ____ or _____ tank
  2. also a storage tank for heat pump systems without _______
  3. Purpose: To prevent liquid refrigerant from entering the _________ during running or off cycles
  4. Protects compressor from too much _____
A
  1. Suction trap or Surge tank
  2. receivers
  3. compressor
  4. liquid
21
Q

Suction Line Accumulators: Use;

When minimum superheat cannot be obtained thus guarding against;

  1. Liquid _______
  2. Liquid _______
  3. Liquid _______
A
  1. flooding
  2. dilution
  3. slugging
22
Q

Suction Like Accumulator use:

  1. Must use an _______ on a hot gas defrost system
  2. Used when an ____ is used
  3. Used on some heat pumps and also acts as a temporary _______
A
  1. accumulator
  2. AXV
  3. receiver
23
Q

Suction Line Accumulator: Installation;

Suction Line Accumulator: Installation;

  1. located as close to the compressor as possible downstream from all other accessories of sized at ___% of system charge
  2. Located upstream from CPR if sized at ___% of system charge
  3. Normally installed on low temp ____-hermetic compressors
  4. sometimes not required on low temp ______ systems
  5. under normal conditions they should not be _______. Some units have built in heaters, and some have coiled hot gas discharge or liquid lines inside shell
A
  1. 50%
  2. 100%
  3. low temp semi hermetic
  4. hermetic
  5. insulated
24
Q

Crankcase pressure regulator (CPR) closes on a ____ of _____

A

closes on a rise of outlet (CRO)

25
Q

Crankcase Pressure Regulator: Purpose;

  1. To limit pressure to a low temp _____ during hot pull down and defrost thus preventing compressor _________
  2. protects compressor from overloading due to high _____ pressure
  3. CRO depends on ______ pressure
A
  1. compressor, overloading
  2. outlet pressure
  3. outlet pressure
26
Q

Crankcase Pressure Regulator is located in the ____ line close to the compressor, _____stream from any other accessory

A

suction line

downstream

27
Q

Vibration Elimination Devices:

  1. *Purpose: Prevents transmission of ______ to various system components
  2. *Prevents damage to ______ connections, excessive strain on system piping, and unnecessary strain on system components
A
  1. vibration

2. Piping connections

28
Q

Vibration Elimination Devices: Types;

  1. Compressor mounting pads - ______ or ______
  2. _______ unit pads
  3. ____ supports
  4. manufactured _______ and _________ vibration eliminators
A
  1. external or internal
  2. condensing unit pads
  3. pipe supports
  4. suction or discharge vibration eliminators
29
Q

Vibration Elimination Devices: Installation;

  1. When brazing heat rapidly and direct flame away from the _____ mesh
  2. Protect from overheating using heat absorbing _______
  3. Must be _______
  4. ***_______ to crankshaft or ___ degrees to the source of vibration
A
  1. wire mesh
  2. paste or pase
  3. anchored
  4. parallel to crankshaft or 90 degrees to source of vibration

Accessories, Piping, Refrigerant & Oils (9 decks)

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