©2001 Thermaco, Inc. All rights reserved • Patented/Patents Pending • Specifications subject to change without notice
Thermaco, Inc. • 646 Greensboro St. • Asheboro, N. C. 27204-2548 • Phone (336) 629-4651
MNL-AST 17
®
AST
Motor Rotation & Operation Settings
BIG DIPPER
systems utilize an electric motor to drive the automatic skimming mechanism. The
standard motor location (shipped from the factory) is on the right hand side of the tank when the
tank is viewed from the inlet end. The motor wiring connections are located inside the enclosure
located on the side of the Big Dipper.
MOTOR ROTATION
When the motor is in its normal right hand location, the motor rotation is clockwise (as viewed from
the shaft end). If the installation requires that the motor be reversed to the left hand location, the
direction of rotation of the motor must be reversed. To connect the motor for counterclockwise
rotation refer to the instructions shown on the bottom of the respective diagrams.
AVAILABLE OPERATION SETTINGS
A. SIMULTANEOUS OPERATION
- (standard setting as shipped from factory)
Big Dipper units may be operated in three different configurations. The standard configuration as
shipped from the factory is called SIMULTANEOUS OPERATION and its wiring diagram is shown
on pages 15 & 16 for respective units. SIMULATANEOUS OPERATION is where the skimmer
motor and tank heater operate at the same time and are electrically energized simultaneously
whenever the 24 hour time control turns the Big Dipper "ON". SIMULTANEOUS OPERATION is
the preferred operating arrangement for most applications.
B. AUTOMATIC OPERATION
Big Dipper units utilized in applications where heavy, congealing-type greases and fats (saturated
fats) are being recovered can use the AUTOMATIC OPERATION setting to allow the Big Dipper's
heater to raise the congealed grease/fats above their melting temperature. In the AUTOMATIC
OPERATION setting, the heater begins operation and the skimmer motor waits to begin operation
when the heater has reached its cut-off temperature (approximately 115 - 130 degrees F (46 - 54
°
C).
Note: The motor will cease operation every time the heater activates to maintain the tank's fluid
temperature.
C. APPLICATIONS NOT REQUIRING A HEATER
Big Dipper units employed in applications such as petroleum removal, 100% unsaturated vegetable
oils or other oils that are liquid at room temperature may be operated without the integral tank fluid
heater.
