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 />
RECYCLE MODE<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 />
IN<br />
NOTE: This secti<strong>on</strong> <strong>on</strong>ly<br />
present <strong>on</strong> model EEAC318<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 />
MASTER<br />
FILTER/DRYER<br />
FIGURE 2-2 RECYCLE MODE<br />
COMPRESSOR<br />
S2<br />
OIL SOLENOID<br />
DISCHARGE<br />
During the Recycle mode, the unit will pull all refrigerant from the vehicle, clean it, and store it in the recovery<br />
tank. To start the sequence, turn the unit’s hand valves to the Recycle positi<strong>on</strong>. Program the unit to<br />
recycle. The Compressor starts, which takes between 5 to 10 sec<strong>on</strong>ds. Once the compressor starts, refrigerant<br />
will enter the Sucti<strong>on</strong> Separator assembly in a liquid or vapor state, but will exit in a vapor state. The refrigerant<br />
will pass through the Master Filter/Dryer to be dried/cleaned of all moisture and processed through the<br />
compressor.<br />
Refrigerant then enters the oil separator to separate the oil that is used to lubricate the compressor. Refrigerant<br />
then exits the oil separator and flows through a check valve to allow the refrigerant to enter the c<strong>on</strong>denser.<br />
Refrigerant is then cooled using a fan and changed from a high-pressure vapor to a high-pressure liquid as it<br />
passes through the c<strong>on</strong>denser. The final stage captures the refrigerant in the Recovery Tank. At the end of the<br />
Recover Mode, the gauge set will indicate approximately 15” of vacuum. The operator must turn the unit hand<br />
valves <str<strong>on</strong>g>OF</str<strong>on</strong>g>F. The operator should m<strong>on</strong>itor the low side gauge for residual pressure buildup. Refer to Appendix<br />
C, Users Manual for more Informati<strong>on</strong>.<br />
NOTE If the Recovery Tank becomes full at any time during the Recycle Mode, an LED will flash and<br />
an error message will be displayed.<br />
Effective<br />
Page 2-2 01/2002<br />
NC<br />
NC<br />
IN<br />
IN<br />
S4<br />
VENT<br />
SOLENOID<br />
S3<br />
VACUUM<br />
SOLENOID<br />
Vacuum Pump<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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