Vacuum, Charging and Recovery

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Vacuum, Charging and Recovery
Vacuum, Charging and Recovery
Sugiyanto, S.T., M.Eng.
[email protected]
Review : Refrigerant
• Refrigerants are substances that
are used to absorb and transport
heat for the purpose of cooling.
• The most common refrigerants
used in mechanical refrigeration
systems today are Refrigerant123 (or R-123), R-134a, and R-22.
Ammonia (R-717) and, under
certain operating pressures, even
water (R-718) and carbon dioxide
(R-744) can be used a refrigerants
Classification of fluids used as refrigerants
Refrigerant cylinder
Review : Effect of Transferring Heat
LATEN HEAT
SENSIBLE HEAT
Review : Refrigeration Systems
Review : Basic Refrigeration Systems
Heat of vaporization of water
Refrigeration cycle
Refrigeration Cycle
Heat of compresion
Expansion Device
Vacuum and Charging Equipments
Refrigerant Recovery Equipment
Gauge manifold
Portable charging cylinder and digital
scale
Gauge manifold used with vacuum
pump
Component part for a general
unit used for evacuating and
charging a systems
A.
B.
C.
D.
Charging Cylinder
Vacuum pump
Gauge manifold
Pressure tube adaptor
Connecting of gauge
manifold
A. Some systems have both a
suction seflice valve and a
discharge seryice valve.
B. Some havi a suchon
semce valve adaptor
mounted on the
comprcssor
C. Some do not have any
service vatves, but do
have a process tube
D. Some have a process tube
that is too short or
inaccessible. In such
systems, a piercing valve is
used. It is attached to
either the liquid line, the
suction line, or both.
The most popular way to
purge the service line
When connecting refrigerant lines or
gauge manifold to any refrigerating
system, keep the system clean. The
lines, gauges, and manifold must be
free of dirt, moisture, and air. The
manifold should be purged with the
same refrigerant used in the system.
The manifold and connecting lines
must be purged before the system
service valve is opened. They must
also be purged before using a piercing
valve stem to open the tubing.
Loosen the line fitting on the system
service valve at C, then open valve B.
Open cylinder line valve E just a little.
Repeat the same procedure for valves
D, A, and E. The cylinder refrigerant
will purge all the lines and the
manifold of air and moisture.
Service Valve
Service valve mounted on hermetic system
may be used for many purposes
•
•
•
•
•
To check internal pressure
To discharge the system or add refrigerant
To add oil
To evacuate the system
To make it easier to replace driers, motor
compressor, evaporator and refrigerant
controls
• To recharge the system
Three types of piercing
valves
A.Charge-and tap
valve.
B.Hand valve type
C.Line-tap type
with hexagonal
wrench
Adding oil to the system
Recovery
Vacuum
Triple Evacuation Process
Low Side Charging
High Side Charging
The following step use charging
cylinder
References
• Althouse, Andrew Daniel, 2004, Modern
Refrigeration and Air Conditioning, The
Goodheart-Willcox Company Inc, USA
• ------,2000, A Trane Air Conditioning Clinic,
American Standard Inc, USA

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