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.22 - 18/10/2005
Service manual VA500-VA750 ed.1 ver.5.05 [MANU360.SA0].doc
THE MACHINE DOESN’T FINISH THE RECOVERY
The machine doesn’t
finish the recovery
Problem
not solved
Verify the presence of the non condensable gasses
into the refrigerant bottle, purge it if necessary
Problem
solved
Close HP and LP valves
Problem
solved
Probable leakage
from external houses,
fittings, a/c system
Problem
not solved
Open HP and LP valves
LP < 0 bar
LP
≥
0 bar
LP
≤
-0,3 bar
Replace the low
pressure switch
LP > -0,3 bar
Measure the LP and the pressure
of the compressor inlet
Press STOP
LP remain steady
LP increase
Make a series of refill and recovery
operations in order to unblock the
solenoid valve of the refilling (EV5)
Problem
solved
Problem not solved
Close the refrigerant bottle valves and clean
(or replace if necessary) the solenoid valve of
the refilling (EV5)
[always wear protective gloves and goggles]
LP
(bar)
Compr.Inlet
(bar)
Table
Differ.
5 3,50 1,5
4 2,54 1,46
3 1,81 1,19
2 1,08 0,92
1 0,37 0,63
0 -0,33 0,33
-0,10 -0,40
0,30
-0,20 -0,46
0,26
-0,30 -0,51
0,21
-0,40 -0,54
0,14
-0,50 -0,58
0,08
Difference > table difference
Change the low pressure
dryer filter and the one way
valve n°1 (attention: do not
stretch the spring)
Difference
≤
table difference
Verify the sealing of the
electronic valve of the
return of the oil of the
compressor (EV3)
Problem
solved
Problem not solved
Verify the sealing of the
manual valve of the new
oil
Verify the sealing of the
electronic valve of the
vacuum pump (EV4)
Problem
solved
Problem
solved
Replace the compressor
NOTE: VERIFY THE SEALING OF THE SOLENOID VALVES
-
EV3 compressor oil return: disconnect the capillary from under
the EV3, seal the outlet of the valve using a finger. verify if there
is pressure, if yes it means that the valve doesn’t close correctly,
so clear or replace the EV3
[always wear protective gloves and
goggles]
-
EV2 oil discharge: make a refilling than a recovery, verify that air
purge from the oil used oil container, if yes it means that the valve
doesn’t close correctly, so clear or replace the EV2
[attention,
this control must be made only during the recovery phase]
[always wear protective gloves and goggles]
-
EV4 vacuum valve: remove the coil, run the vacuum phase (if
necessary disconnect the low pressure switch to let the vacuum
start), read the pressure into the HP/LP manometers, if decrease it
means that the valve doesn’t close correctly, so clear or replace
the EV4
N.B. the disconnected coil could burn please insert
inside the inner body of another electronic valve
[always wear
protective gloves and goggles]
