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HVAC > Test 5 > Flashcards

Test 5 Flashcards

1
Q

Liquid Line Filter Dryers help to clean up what?

Do they remain in system?

A

system contaminants
Yes

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2
Q

Liquid Line Filter Driers removes what?

A

dirt and debris
•

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3
Q

When would you replace Liquid Line Filter Driers?

What are Liquid Line Filter Driers made of?

A

whenever system is dirty; or opened
• “When in doubt, change it out.”
Screens and fiberglass filters:

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4
Q

First letter(s) are manufacturer specific:

What does “C” stand for in filter drier line?

What does “EK” stand for in

A

Sporlan’s “Catch-All” line of filter driers

– “EK” for Alco’s (Emerson’s) “Extra Klean”

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5
Q

The First two numbers are for cubic inches capacity… 03 is for ________ and “30”

A

3 cubic inches and “30” for 30 cubic inches

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6
Q

Type of Dessicant: Activated Alumina causes

A

– High acid removal, and has moderate moisture capacity

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7
Q

Dessicant: Molecular Sieve
Does it have high water capacity?
Low or high acid removal?

A

Yes
low acid removal

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8
Q

Dessicant: Silica Gel
Do you use this in expensive or inexpensive filter driers?

Is the capacity high water or low water only?

A

• Used in “inexpensive” filter driers

– High water capacity only

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9
Q

What is the first step in Choosing the Correct Filter Drier?

Is sizing the same for A/C and refrigeration?

A

• First, determine tonnage
– No

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10
Q

What is the second and third step in Choosing the Correct Filter Drier?

A

Choose pipe size

• Then, connections
(Flare or sweat)

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11
Q

Suction Line Filter Driers is located where?

And what is the purpose of Suction Line Filter Driers?

A

– In the suction line

– Removes debris, moisture, and acid from system

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12
Q

Suction Line Filter Driers are designed for what?
When would you install one?

A

temporary use to clean up system
after a compressor burnout

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13
Q

What should you always check in Suction Line Filter Driers?

• “Rule of thumb”: for replacing Suction Line Filter Driers?

A

– Check pressure drop, or temperature drop
3°or more requires filter replacement or removal

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14
Q

With Suction Line Filter Driers – Excessive pressure drop?
– Low suction increases compression_______

A

is equivalent to 3°temperature drop

ratio and discharge heat

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15
Q

Should you leave Suction Line Filter Driers in system?

You should remove filters within _____

A

No!
3 days

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16
Q

Sight Glasses are located in_______

And the sight glass purpose of sight glass is to indicate ________

A

– In the liquid line
• liquid refrigerant flow

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17
Q

What are Sight Glasses made of?

The sight glass only shows what?

A

– Plain glass
refrigerant flow

18
Q

Sight Glasses are with a…
So sight glasses show both refrigerant flow and…

A

moisture indicator
if moisture is present

19
Q

Receivers are located in and right after what?

Receiver is a storage tank for?

A

– In the liquid line after the condenser
• for liquid refrigerant

20
Q

What is the capacity of Receivers is the full charge of system…

A

plus 20%

21
Q

The full charge of the Receiver which only take up ______ of the receiver?

Receivers are used on systems with….

A

• take up 80% of the receiver
• expansion valves

22
Q

The King Valve on the Receiver is located?

A

– On receiver outlet
A service port

23
Q

The King Valve on the Receiver is used to?

A

– pump down system

24
Q

The King Valve on the Receiver has many postions…so when it is cracked you should…

When it is cracked the gauge port is… (and something else is open)

A

• check system pressure
• open, liquid line open

25
Q

The King Valve on the Receiver when it is front-seat you should do a
So in this case the gauge port is …(and something else is closed)

A

-pump down system
• Gauge port open, liquid line closed

26
Q

The King Valve on the Receiver when it is Back-seated it is in…
So the gauge port is …. (And something else is open)

A
  1. normal operation
    • Gauge port closed, liquid line open
27
Q

Suction Line Accumulators are located?

It’s purpose it to capture and boil…

A

In the suction line near compressor
– off liquid to prevent flooding

28
Q

Suction Line Accumulators are used on…

When does flooding occur?

A

– pumps and freezers
• on startup after defrost

29
Q

Is sweating of Suction Line Accumulators normal?

But what may eventually cause leaks?

A

– Yes
• rusting

30
Q

Should Suction Line Accumulators be insulated?

Heat in the ambient air is needed to do what?

A

– No
• boil off liquid refrigerant

31
Q

Where and Why of Oil Separators located?

And where is it close to?

Is it in a hot or warm location?

A

– On the discharge line
– Close to crankcase
– In a warm location

32
Q

What do Oil Separators do? (Hint…seperates two things)

After which the oil will return to….

A

– Separates oil from discharge gas
– compressor crankcase

33
Q

Are Oil Separators used on large or small systems?
With long…

A

– Used on large systems

long piping runs

34
Q

Heat Exchangers are located?

How do heat exchangers work? (Hint…exchange)

A

– At the evaporator
– Suction line absorbs heat from liquid line

35
Q

What are some benefits of Heat Exchangers?

A

– Subcools liquid

36
Q

Heat Exchangers prevents what before entering TEV?

When are heat exchangers important?

Heat exchangers also improve what?

A

• “flashing”
– on long liquid line runs
• evaporator efficiency

37
Q

What do Crankcase heaters do?

And what do they prevent… ultimately preventing what

A

• boil off refrigerant

Prevent “Flooded Starts”

compressor damage

38
Q

Where are Crankcase Heaters located?

A

In, under or around compressor crankcase

39
Q

What is the purpose of Crankcase Heaters? (Hint…oil)

By doing this it prevents damage from…

A

– any liquid refrigerant in the oil
– “flooded starts”

40
Q

What is the purpose of the Vibration Absorber / Eliminator?

A

– Protect tubing from vibration

41
Q

What do vibrations cause?

A

• leaks
•

42
Q

/ Eliminator is located near what and on what lines?

This tool is often used on what type of hermetic compressors?
The Vibration Absorber is inline with…

A

– Near compressor , On suction and discharge lines

Semi-Hermetic
compressors

compressor crankshaft

HVAC (16 decks)

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