Test 5 Flashcards
Liquid Line Filter Dryers help to clean up what?
Do they remain in system?
system contaminants
Yes
Liquid Line Filter Driers removes what?
dirt and debris
•
When would you replace Liquid Line Filter Driers?
What are Liquid Line Filter Driers made of?
whenever system is dirty; or opened
• “When in doubt, change it out.”
Screens and fiberglass filters:
First letter(s) are manufacturer specific:
What does “C” stand for in filter drier line?
What does “EK” stand for in
Sporlan’s “Catch-All” line of filter driers
– “EK” for Alco’s (Emerson’s) “Extra Klean”
The First two numbers are for cubic inches capacity… 03 is for ________ and “30”
3 cubic inches and “30” for 30 cubic inches
Type of Dessicant: Activated Alumina causes
– High acid removal, and has moderate moisture capacity
Dessicant: Molecular Sieve
Does it have high water capacity?
Low or high acid removal?
Yes
low acid removal
Dessicant: Silica Gel
Do you use this in expensive or inexpensive filter driers?
Is the capacity high water or low water only?
• Used in “inexpensive” filter driers
– High water capacity only
What is the first step in Choosing the Correct Filter Drier?
Is sizing the same for A/C and refrigeration?
• First, determine tonnage
– No
What is the second and third step in Choosing the Correct Filter Drier?
Choose pipe size
• Then, connections
(Flare or sweat)
Suction Line Filter Driers is located where?
And what is the purpose of Suction Line Filter Driers?
– In the suction line
– Removes debris, moisture, and acid from system
Suction Line Filter Driers are designed for what?
When would you install one?
temporary use to clean up system
after a compressor burnout
What should you always check in Suction Line Filter Driers?
• “Rule of thumb”: for replacing Suction Line Filter Driers?
– Check pressure drop, or temperature drop
3°or more requires filter replacement or removal
With Suction Line Filter Driers – Excessive pressure drop?
– Low suction increases compression_______
is equivalent to 3°temperature drop
ratio and discharge heat
Should you leave Suction Line Filter Driers in system?
You should remove filters within _____
No!
3 days
Sight Glasses are located in_______
And the sight glass purpose of sight glass is to indicate ________
– In the liquid line
• liquid refrigerant flow
What are Sight Glasses made of?
The sight glass only shows what?
– Plain glass
refrigerant flow
Sight Glasses are with a…
So sight glasses show both refrigerant flow and…
moisture indicator
if moisture is present
Receivers are located in and right after what?
Receiver is a storage tank for?
– In the liquid line after the condenser
• for liquid refrigerant
What is the capacity of Receivers is the full charge of system…
plus 20%
The full charge of the Receiver which only take up ______ of the receiver?
Receivers are used on systems with….
• take up 80% of the receiver
• expansion valves
The King Valve on the Receiver is located?
– On receiver outlet
A service port
The King Valve on the Receiver is used to?
– pump down system
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)
• check system pressure
• open, liquid line open
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)
-pump down system
• Gauge port open, liquid line closed
The King Valve on the Receiver when it is Back-seated it is in…
So the gauge port is …. (And something else is open)
- normal operation
• Gauge port closed, liquid line open
Suction Line Accumulators are located?
It’s purpose it to capture and boil…
In the suction line near compressor
– off liquid to prevent flooding
Suction Line Accumulators are used on…
When does flooding occur?
– pumps and freezers
• on startup after defrost
Is sweating of Suction Line Accumulators normal?
But what may eventually cause leaks?
– Yes
• rusting
Should Suction Line Accumulators be insulated?
Heat in the ambient air is needed to do what?
– No
• boil off liquid refrigerant
Where and Why of Oil Separators located?
And where is it close to?
Is it in a hot or warm location?
– On the discharge line
– Close to crankcase
– In a warm location
What do Oil Separators do? (Hint…seperates two things)
After which the oil will return to….
– Separates oil from discharge gas
– compressor crankcase
Are Oil Separators used on large or small systems?
With long…
– Used on large systems
long piping runs
Heat Exchangers are located?
How do heat exchangers work? (Hint…exchange)
– At the evaporator
– Suction line absorbs heat from liquid line
What are some benefits of Heat Exchangers?
– Subcools liquid
Heat Exchangers prevents what before entering TEV?
When are heat exchangers important?
Heat exchangers also improve what?
• “flashing”
– on long liquid line runs
• evaporator efficiency
What do Crankcase heaters do?
And what do they prevent… ultimately preventing what
• boil off refrigerant
Prevent “Flooded Starts”
compressor damage
Where are Crankcase Heaters located?
In, under or around compressor crankcase
What is the purpose of Crankcase Heaters? (Hint…oil)
By doing this it prevents damage from…
– any liquid refrigerant in the oil
– “flooded starts”
What is the purpose of the Vibration Absorber / Eliminator?
– Protect tubing from vibration
What do vibrations cause?
• leaks
•
/ 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…
– Near compressor , On suction and discharge lines
Semi-Hermetic
compressors
compressor crankshaft
