CHAPTER 2 THEORY OF OPERATION - Snap-on Equipment
CHAPTER 2 THEORY OF OPERATION - Snap-on Equipment
CHAPTER 2 THEORY OF OPERATION - Snap-on Equipment
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<str<strong>on</strong>g>CHAPTER</str<strong>on</strong>g> 2 <str<strong>on</strong>g>THEORY</str<strong>on</strong>g> <str<strong>on</strong>g>OF</str<strong>on</strong>g> <str<strong>on</strong>g>OPERATION</str<strong>on</strong>g><br />
VACUUM MODE<br />
The Vacuum Mode is initiated when the operator programs the unit to pull a vacuum from the vehicle using the<br />
ECO Xtreme. When the unit is set to Vacuum Mode and both hand valves are in the positi<strong>on</strong>. The unit<br />
will then turn the compressor ON (Vacuum Pump for the EEAC318). Once the compressor (pump) starts it will<br />
pull a deep vacuum from 25" Hg to 29" Hg. The pressure from the discharge side of the compressor is vented<br />
to atmosphere via S3 solenoid (in the EEAC318 solenoid S3 provides a path to the Vacuum Pump). During this<br />
process in the Model EEAC316, some oil from the compressor might escape, but is trapped in the bottom of the<br />
Compressor Oil Separator. At the end of the Vacuum cycle, the Oil Solenoid (S2) will open allowing the vacuum<br />
from the compressor to pull the oil back to the compressor.<br />
Special C<strong>on</strong>siderati<strong>on</strong>:<br />
In the Model EEAC318 the Vacuum Pump may require up to 60 sec<strong>on</strong>ds to restart if power is cycled quickly.<br />
Also, the Vacuum Pump will automatically shut down if it does not pull 15”Hg in 2.5 minutes. This is to prevent<br />
oil loss.<br />
!<br />
DURING A VACUUM MODE THE OUTPUT <str<strong>on</strong>g>OF</str<strong>on</strong>g> EITHER THE COMPRESSOR (EEAC316) OR THE VACUUM<br />
PUMP (EEAC318) IS VENTED TO ATMOSPHERE. PERFORMING A VACUUM ON A VEHICLE THAT HAS<br />
REFRIGERANT IN THE SYSTEM WILL VENT THAT REFRIGERANT TO ATMOSPHERE.<br />
VEHICLE<br />
ADAPTER<br />
HIGH PORT<br />
BULKHEAD<br />
LOW PORT<br />
BULKHEAD<br />
VAPOR<br />
LIQUID<br />
AIR<br />
OIL<br />
0<br />
10 20<br />
0<br />
30<br />
500<br />
120<br />
HV1<br />
3-WAY VALVE<br />
1<br />
3<br />
LIQUID LINE<br />
2<br />
HV2<br />
3-WAY VALVE<br />
4 5<br />
6<br />
ABBV<br />
LIQUID VAPOR<br />
SCHRADER<br />
VALVE<br />
TRANSDUCER<br />
0 - 500 PSI<br />
50 LB.<br />
RECOVERY<br />
TANK<br />
NOTE: This secti<strong>on</strong> <strong>on</strong>ly<br />
present <strong>on</strong> model EEAC318<br />
IN<br />
NC<br />
S1<br />
PURGE SOLENOID<br />
.062 ORIFICE<br />
SUCTION<br />
SEPARATOR<br />
VAPOR LINE<br />
OIL DRAIN<br />
VALVE<br />
OIL<br />
BOTTLE<br />
FIGURE 2-4 VACUUM MODE<br />
MASTER<br />
FILTER/DRYER<br />
COMPRESSOR<br />
S2<br />
OIL SOLENOID<br />
DISCHARGE<br />
Effective<br />
Page 2-4 01/2002<br />
IN<br />
S3<br />
VACUUM<br />
SOLENOID<br />
NC<br />
NC<br />
IN<br />
S4<br />
VENT<br />
SOLENOID<br />
Vacuum Pump<br />
NOTE: Vacuum<br />
path depends<br />
<strong>on</strong> Model #<br />
see text<br />
PROCESS<br />
CONDENSER<br />
SUCTION<br />
NC<br />
CYCLE HV1 HV2<br />
RECOVERY 1 to 2 4 to 5<br />
VACUUM 1 to 2 4 to 5<br />
CHARGE 3 to 1 6 to 4<br />
IN<br />
IN<br />
OUT<br />
RETURN<br />
OIL SEPARATOR<br />
CHECK<br />
VALVE<br />
NOTE: This secti<strong>on</strong> <strong>on</strong>ly<br />
present <strong>on</strong> model EEAC316<br />
HIGH PRESSURE<br />
CUT<str<strong>on</strong>g>OF</str<strong>on</strong>g>F SWITCH<br />
OPENS AT 450PSI<br />
NC<br />
IN<br />
S3<br />
VACUUM<br />
SOLENOID
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