Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 39 of 105
VI. System Operational Description and Component Review (continued)
A. PLC unit Status Indicators (continued)
OUTPUT # COMPONENT
A1 NOT USED
A2 INLET SOLENOID VALVES (SV1, SV1A) & INLET LAMP
A3 PROCESSING LAMP
A4 VENT SOLENOID VALVE (SV3) & N2 VENT LAMP
A5 HIGH LEVEL LAMP
A6 COMPRESSOR INLET SOLENOID VALVE (SV2) & EVACUATION LAMP
A7 LOW LEVEL LAMP
A8 NITROGEN SUPPLY SOLENOID VALVE (SV3) & N2 SUPPLY LAMP
B1 OUTLET PUMPS (LP1)
B2 OUTLET SOLENOID VALVE (SV4) & OUT LAMP
B3 EVACUATION COMPRESSOR (C1) & COMPRESSOR LAMP
B4 MID LEVEL LAMP
B5 NOT USED
B6 NOT USED
B7 NOT USED
B8 NOT USED
B. The Nitrogen Vent Cycle
There are two nitrogen vent modes: the intermediate vent and the final vent.
The Intermediate vent mode is activated when the pressure in the processing tank has
been above the pressure controller alarm #1 set point (PLC input #A3 Deactivates) for
over five minutes, or if the processing tank pressure reaches 200 psi (PLC input #B5
Deactivates). The PLC discontinues inlet recovery and begins the nitrogen vent process.
When the temperature in the process tank drops below the Temperature Controller #2
alarm setting (PLC input #A1 Activates) the PLC will open the N2 Vent Solenoid Valve
venting nitrogen.
The intermediate vent cycle will end when the pressure in the process tank falls
below the pressure controller alarm #1 set point (PLC input #A3 Activates). The PLC
will close the vent solenoid valve.
The final vent mode is activated when the liquid level in the process tank reaches mid-
level (PLC input #B4 Activates), or the inlet vacuum switch indicates that the source
container is at (-10”) Hg vacuum (PLC input #A6 Deactivates). The PLC discontinues inlet
recovery and begins the nitrogen vent process. The final vent will complete the nitrogen
separation process for the quantity of AGENT contained in the process tank.
When the temperature in the process tank drops below the Temperature Controller #2
alarm setting (PLC input #A1 Activates) the PLC will open the N2 Vent Solenoid Valve
venting nitrogen to the ambient air.
The final vent cycle will end when the pressure in the process tank drops below the
pressure controller alarm #2 set point (PLC input #A2 Deactivates). A pump out to
the receiving container will follow a final vent if the liquid in the process tank is above low-
level (PLC input #B2 activates).
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