Komatsu 830E Shop Manual page 580

RECOVERING AND RECYCLING THE
REFRIGERANT
Draining the Oil from the Previous Recovery Cycle
1. Place the power switch and the controller on the
recovery unit in the OFF position.
2. Plug in the recovery station to the correct power
source.
3. Drain the recovered oil through the valve marked
OIL DRAIN on the front of the machine.
4. Place the controller knob in the ON position. The
low pressure gauge will show a rise.
5. Immediately switch to the OFF position and allow
the pressure to stabilize. If the pressure does not
rise to between 5 psi and 10 psi, switch the con-
troller ON and OFF again.
6. When the pressure reaches 5 to 10 psi, open the
OIL DRAIN valve, collect the oil in an appropriate
container, and dispose of container as indicated
by local, state or Federal Regulation. THE OIL IS
NOT REUSABLE, DUE TO CONTAMINANTS
ABSORBED DURING USE.
Performing the Recovery Cycle
1. Be sure the equipment being used is designed for
the refrigerant you intend to recover.
2. Observe the sight glass oil level. Having drained
it, it should be zero.
3. Check the cylinder refrigerant level before begin-
ning recovery to make sure you have enough
capacity.
4. Confirm that all shut-off valves are closed before
connecting to the AC system.
5. Attach the appropriate hoses to the system being
recovered.
6. Start the recovery process by operating the equip-
ment as per the manufacturer' s instructions.
7. Continue extraction until a vacuum exists in the
AC system.
8. If an abnormal amount of time elapses after the
system reaches 0 psi and does not drop steadily
into the vacuum range, close the manifold valves
and check the system pressure. If it rises to 0 psi
and stops, there is a major leak.
M9-24
9. Check the system pressure after the recovery
equipment stops. After five minutes, system pres-
sure should not rise above "0" gauge pressure. If
the pressure continues to rise, restart and begin
the recovery sequence again. This cycle should
continue until the system is void of refrigerant.
10. Check the sight glass oil level to determine the
amount of oil that needs to be replaced. (The
amount of oil that was lost during the recovery
cycle must be replaced back into the system).
11. Mark the cylinder with a RECOVERED (red) mag-
netic label to reduce the chance of charging a
system with contaminated refrigerant. Record the
amount of refrigerant recovered.
Performing the Recycling Procedure
The recovered refrigerant contained in the cylinder
must undergo the recycle procedure before it can be
reused. The recycle or clean mode is a continuous loop
design and cleans the refrigerant rapidly. Follow equip-
ment manufacturer' s instructions for this procedure.
Evacuating and Charging the AC System
Evacuate the system once the air conditioner compo-
nents are repaired or replacement parts are secured,
and the AC system is reassembled. Evacuation
removes air and moisture from the system. Then, the
AC system is ready for the charging process, which
adds new refrigerant to the system.
Air Conditioning System
for HFC 134a Refrigerant
05/02 M09010