Finish Thompson Little Cooler - Manual (Page 7)

7
Electrical Connections for Models LS-15IIE and LS-55IIE:
The design of the LS-15IIE and LS-55IIE solvent distillation systems provides automatic
termination of its cycle by time. Following the procedure below will allow a System II “E” to
control the Little Cooler for automatic start/stop control. In addition, a timer in the LS unit will
allow the Little Cooler to run for one hour after cycle termination to condense any vapors
remaining in the LS unit’s boiling chamber.
Materials required (customer provided):
 One 3/4 inch potted seal fitting (explosion proof)
 Potting material for above fitting
 Electrical conduit to reach from the LS unit to the Little Cooler
 18/2 with ground (or larger) electrical wire of similar length
 One contactor: use a 2 pole, 20 amp, with 220 volt coil
 One electrical enclosure (water-tight) for the above contactor (to mount on Little Cooler)
 Instruction manual for the LS unit
Procedure:
1. Disconnect main power supply to both the LS unit and the Little Cooler.
2. Run the electrical wire and conduit from the rear of the LS unit to the Little Cooler.
3. Install a potted seal fitting between the Still’s connection box and the conduit from the Little
Cooler (make sure that the control wires to the Little Cooler run through this fitting).
4. Make the electrical connections (wires B and 1L2) and seal the potted fitting with approved
potting material. The potted fitting is to prevent vapors from entering the conduit and
leaving the hazardous area.
5. Mount the customer-supplied junction box and contactor to the Little Cooler near its main
junction box.
6. Connect the two wires from the LS unit to the "coil" side of the contactor. Connect the 230-
volt incoming power (L1 and L2) to the "hot" side of the contactor, and the Little Cooler to
the "cold" side of the contactor. Connect grounds as normal.
JUNCTION BOX
(CUSTOMER-SUPPLIED,
MOUNTED TO THE
LITTLE COOLER)
CONTROL WIRES
FROM STILL TO
CONTACTOR’S COIL
(WIRES B AND 1L2)
POWER OUT
TO LITTLE COOLER’S
MAIN JUNCTION BOX
MAIN POWER IN
CONTACTOR
(CUSTOMER-
SUPPLIED)
GROUND