The data, information and descriptions, and the technology described herein are the exclusive intellectual property of Ecotechnics S.p.A. and constitute industrial
secrets. Said information is communicated in strict confidentiality; said information may be used only for the purpose for which it is communicated; said information
may not be divulged, communicated, or revealed to third parties and/or reproduced by any means for any reason whatsoever; said information is protected under
applicable Italian competition and industrial property law.
pag.8 - 18/10/2005
Service manual VA500-VA750 ed.1 ver.5.05 [MANU360.SA0].doc
The recovery phase shuts down with the de-energising of EV1 when the pressure switch (7)
reaches a pressure of –0.3 bar, the EV2 valve is automatically opened to drain the used oil,
and the electronic valve EV3 for the return of the oil of the compressor
VACUUM PHASE
At the end of the recovery phase there is an interval of around 2 minutes during which any gas
returning from the system will result in the recovery phase being immediately restarted.
Otherwise the vacuum phase will automatically begin. During this phase only the EV4 solenoid
valve is energised so that air and non-condensable gases can be evacuated through the
vacuum pump (10). The vacuum pump is a single stage model with an involute capacity of
112l/min and a vacuum degree of 0.1 mbar.
The vacuum phase can also be selected from the keyboard as long as the air conditioning
system has been completely discharged. The vacuum phase will only start under these
conditions, otherwise the machine will sound an acoustic alarm and it will be necessary to
begin from the recovery phase.
FILLING PHASE
Once the vacuum phase has concluded, the technician will carry out the recharging of new oil,
and refrigerant. The new oil in the container (35), passes through the new oil valve (34), the
check valve n°4 (19) and reaches the distributor where there is a vacuum.
Once injection of oil is complete, the EV5 solenoid valve is energised and the refrigerant flows
from the bottle to the distributor and then into the air conditioning system, where there is a
vacuum, by simply making use of the pressure difference between the bottle and the system.
Once the required weight has been reached, the EV5 solenoid valve closes, blocking the flow
of refrigerant from the bottle.
NOTE: Numbers under bracket of this chapter are referred to the hydraulic diagram.
THE MACHINE
BASIC COMPONENTS
a) Control console
b)Taps
c)
Handle
d)
High/Low
Pressure threaded connectors
e) Top-up oil container
f) Bottle
g)
Drying
filters
h)Electronic
scale
j)
Main
switch
i)
Heating resistance (ONLY MODEL XK360)
k) Socket for electrical supply plug
l) Fuse
m) Used oil container
n) Serial port
o)
Humidity
gauge
p)
Vacuum
pump
q) Wheels
