Copyright 2014 • Big Dipper® Thermaco, Inc®. • 3
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Heater Settings
There are three separate options for heater operation in the 40000 Series Big Dipper. Settings are enabled
by moving the jumper to the correct position on the jumper block marked HEATER.
Simultaneous Heat Operation (Standard)
Units Ship with jumper in Position B, which results in Simultaneous Heater Operation meaning
the Heater will activate anytime the motor is engaged.
Fluid Preheat Operation
To activate Fluid Preheat setting, move jumper to Position C on the jumper block using needle
nose pliers. In this setting, heater will activate prior to skim cycle, which will begin once the
liquid temperature has reached 130º F or after a maximum of 2 hours has passed. The heater
will continue to operate under Thermistor control until skim cycle is complete.
No Heater Operation
To deactivate heater, move jumper to Position A. In situations with low water turnover or
grease production, a heater may not be necessary. Contact a Thermaco representative before
deciding to deactivate heater operation.
AST Settings
The AST Settings only affect operation of the unit when the AST Solenoid is wired to the board. This
comes standard in the AST line of Big Dipper Units and the setting chosen determines how often and
for how long the AST function operates.
2 Hour Interval (Standard for W-750-AST and W-1250-AST Models)
In this setting, used with W-750-AST and W-1250-AST Models, the AST Feature will operate for
15 seconds every 2 hours, flushing incidental solids from the system. The jumper will be placed
on the lower two jumper pins to activate this setting.
24 Hour Interval (Standard for W-250-AST)
In this setting, used with the W-250-AST, the AST Feature will operate for 10 seconds every 24
hours, flushing incidental solids from the system. The jumper will be placed on the upper two
jumper pins to activate this setting.
Board Settings for 40000 Series Big Dipper
NOTICE:
This document contains information on changing the settings inside the Center Lid Assembly of a 40000
Series Big Dipper.
DISCONNECT POWER TO CENTER LID ASSEMBLY BEFORE MAKING CHANGES.
Contact a Thermaco representative before making changes to settings.
Use needle nose pliers to remove and replace jumpers.
