15. Recovering Refrigerant
• The compressor burnout will not
damage the refrigerant.
• The refrigerant can be recovered if the
contaminants are removed.
• Reference:
Cleaning Procedures
Page 26 B Exp (S1) 40-10
Sporlan
23. Better safe than sorry
Remove the compressor carefully
• Remove the burned compressor
• Be aware that the system can be acid contaminated
• Do not touch oil with your bare hands
• Avoid breathing the acid vapors
24. You need to know what went wrong?
Before you install the new compressor
1.- Refrigerant Floodback
2.- Flooded Starts
3.- Slugging
4.- Compressor Overheating
5.- Electrical Failure
31. Remove the accesories from the
system
• Such as:
• Liquid Line and
Suction Filters
• Liquid indicators
• Metering devices
• Solenoid Valves
• Manual Valves
• Oil Separator
34. Install a new thermostatic valve
Clean all the accessories
Install a new thermostatic valve
Or install a new metering device
35. Install a big liquid line filter
• This should be the
largest you can
install.
36. Activated Carbon Filter
If the system is above 40 tons
This filter removes:
Oil Sludge, neutralizes
acid in the system, and
also removes debriefs
from the motor burnout.
The carbon activated
filter or core is the one
you should install
37.
38. Permanent Suction Line Filter / Drier-Filter
If the system is up to 40 tons
This filter is made of a
blended mixture of activaded alumina and molecular sieves
Brazing type
suction filter
39. Liquid line sight glass
(Moisture Indicator)
• This accessory will help us know when we need
to change the cores filters.
40. Oil Separator
Install a new oil separator
It is very possible that you will find debriefs of compressor in it
49. Non condensable gases effects
• If you leave non condensable
gases in the system they will cause:
1. High temperature in the high side
pressure.
2. The high pressure valve will become
very hot
3. Organic acids will form.
4. They will cause a early compressor
failure.
50.
51.
52.
53.
54.
55.
56.
57. Moisture presence in the system
1. It will cause ice presence.
2. Ice will block the system metering
devices in the system such as:
• Cap tubes
• Thermostatic Expansion Valves
3. System problems.
4. It might damage internal compressor
parts.
58. When TEV is closed
• High temperature side very hot.
• High superheat at the compressor.
• Suction pressure lower than usual.
59. When TEV is wide open
• Cause Refrigerant Flood Back into to
the compressor crankase
• Low Super heat at the compressor.
• Suction pressure, unsual higher
suction pressure.
60.
61.
62. • These two contaminants will cause a
chemical reaction that will form:
1. Organic Acids
2. Oil Sludge
• Will cause early failures
in the compressors.
63.
64.
65.
66.
67. What happens if I pull the vacumm with the
compressor?
The motor insulation will be damaged
since the start up.
1. The motor windings work with out cooling,
that will cause damage to the motor
insulation.
2. The windings will short because of heat and
because the motor is working in a vacuum
environment condition.
68.
69.
70.
71. How to select the right vacuum pump?
1. You need to know the refrigeration
tons’ capacity of the system.
2. Thumb Rule: 1 cfm can dehydrate a 7
refrigeration tons system.
3. Now you are ready to select
the right vacuum capacity.
72. Example
• 30 R.T. Chiller
• The recomended
vacuum pump will
be:
– 6 CFM x 7 = 42 Tons
– 4 CFM x 7 = 28 Tons
75. Copeland Application Engineering Bulletin
Process
» Connect your vacuum pump
to the system
» Start the vacuum pump
» We stop when reach 1500
microns
» Break the vacuum with
nitrogen and pressurize the
system up to 2 psig.
» Wait 30 minutes
Triple Evacuation Process
Step 1
2 psig
76.
77. The vacuum pump must be connected to both the high
and low sides of the system through adequate
connections
80. Better safe than sorry
The nitrogen tank must have a pressure-regulating valve
Never attempt to pressurize a system without first
installing an appropriate pressure-regulating valve.
81. • The vacuum pump oil will turn white
• Open the vacuum pump gas ballast
• Wait until the oil slowly restores to its
usual state
• Close the gas ballast valve
82.
83. Copeland Application Engineering Bulletin
2 psig
Triple Evacuation Process
Step 2
» Vent the nitrogen from the
system
» Connect your vacuum pump to
the system
» Start the vacuum pump
» We stop when reach 1500
microns
» Break the vacuum with nitrogen
and pressurize the system up to
2 psig.
» We wait 30 minutes
84. Copeland Application Engineering Bulletin
» Vent the nitrogen from the
system
» Connect your vacuum pump to
the system
» Start the vacuum pump
» Stop your pump when you reach
500 or 250 microns, depending
the type of lubricant
» Break the vacuum with
refrigerant
Triple Evacuation Process
Step 3
85. Why the moisture is eliminated from the
system?
•The system pressure drops down
•The water boiling point changes
•The ambient temperature remains the same
86. For how long?
• You cannot measure vacuum with time
• External conditions that affect vacuum
time:
– Meters above the sea level
– System or equipment temperature
– Hose diameter
– Hose length
– Manifold location
88. Charge the system with refrigerant
• Decide if you are
reusing the recovered
refrigerant of the
system.
• Charging metods:
– By Superheat
– By Weight
89. Charging measuring Superheat
• Start the system
• Wait until the system
stabilizes
• Check the superheat
• Example:
• Suction Line Temp: 44°F
• Evaporating Temp: 34°F
• Superheat: 10°F
91. An oil sample should be taken every
24 running hours
• Then the oil
• The filter-driers
• Or both may be
changed.
• Depending upon
results of the oil
test.