Komatsu 830E-AC Shop Manual page 949

Electronic Leak Detector
(Refer to Figure 4-7). As the test probe is moved into
an area where traces of refrigerant are present, a
visual or audible announcement indicates a leak.
Audible units usually change tone or speed as inten-
sity changes.
Tracer Dyes
Tracer dyes are available that can be added to the
system as refrigerant is added. The system is then
operated to thoroughly circulate the dye. As refriger-
ant escapes, it leaves a trace of the dye at the point
of leakage, which is then detected using an ultravio-
let light (black light), revealing a bright fluorescent
glow.
Soap and Water
Soap and water can be mixed together and applied
to system components. Bubbles will appear to pin-
point the specific location of leaks.
After determining the location or source of leak(s),
repair or replace leaking component(s).
NOTE: The length of the hose will affect the
refrigerant capacity. When replacing hoses, always
use the same hose length, if possible.
Before system assembly, check the compressor
oil level and fill to specifications.
N04031 10/06
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 34-69 kPa (5-10 psi),
switch the controller ON and OFF again.
6. When the pressure reaches 34-69 kPa (5-10
psi), open the "oil drain" valve, collect the oil in
an appropriate container, and dispose of con-
tainer as indicated by local, state or federal reg-
ulation. 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
beginning recovery to make sure you have
enough capacity.
4. Confirm that all shut-off valves are closed
before connecting to the A/C system.
5. Attach the appropriate hoses to the system
being recovered.
6. Start the recovery process by operating the
equipment as per the manufacturer's instruc-
tions.
7. Continue extraction until a vacuum exists in the
A/C 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 mani-
fold valves and check the system pressure. If it
rises to 0 psi and stops, there is a major leak.
Operator Comfort N4-23