Viscosity Function:
In soft serve freezers the logic board monitors amp draw on
the beater motor, which is directly related to the viscosity of
the product in the freezing cylinder. When the amp draw
reaches its set point, the unit cycles off. Therefore, the
viscosity of the product will always be consistent even
through its temperature may vary slightly.
To monitor amperage, L1 power supplied to the beater motor
must pass through the power board beater terminals. The
same softech controls are used in both single and three
phase applications. For this reason the control must be set to
operate in an amperage range which relates to the beater
motor amperage and the desired product viscosity setting.
The selected amperage range simply determines the
adjustment span of the viscosity adjustment potentiometer on
the logic board. The jumper on the power board determines
the amperage range selection. The jumper is placed on the
pin which corresponds to the beater motor amperage when
the desired product viscosity is attained. See page 22 to
locate the range selection jumper.
Viscosity Control Range Selections:
2.4 PIN- 1.2 AMP to 2.4 AMP
5.0 PIN - 2.5 AMP to 5.0 AMP
8.0 PIN - 4.0 AMP to 8.0 AMP
11.2PIN - 5.7 AMP to 11.2 AMP
Setting Viscosity Adjustment:
1. Place an amp probe on one of the L1 leads on the
beater terminal on the power board.
2. Turn the viscosity adjustment screw to the "MAX"
position.
3. With the freezer properly primed, actuate the
refrigeration cycle (press "AUTO").
4. During the freezing process, draw a sample and
inspect the product appearance. When desired
product viscosity and appearance is achieved, note
the beater motor amperage.
5. Cancel the refrigeration cycle (press "AUTO").
6. Using the chart, set what range the beater motor
amperage falls into and place the jumper on the proper
pin. (Note: See chart above for amperage range.)
7. Press "AUTO". When amperage achieves the previously
noted beater motor amperage, turn the viscosity
adjustment screw counterclockwise slowly until the unit
cycles off.
8. Draw several samples to verify that the amperage
at cycle off and product quality remains consistent.
Mix Adjustment:
The mix setting is the temperature adjustment for the mix
cabinet or the mix hopper.
Ideal mix temperature = 38°F (3.3°C) to 40°F (4.4°C).
Cut-out temperature will always be 13°F (7.2°C)
(cabinet)/4.5° F (2.5°C) (hopper) lower than the cut-in
temperature. (See SB 2474.)
The range for cut-in temperature is "MIN" approximately
52'F (11.0'C) and "MAX" approximately 36*F (2.2'C).
Setting the Mix Cabinet Temperature:
1. Place a thermometer in the cabinet close to the
thermistor probe.
2. Turn the mix adjustment screw all the way to "MAX".
3. When the air temperature in the cabinet reaches 30° F
to 31 °F (-1.1 °C), turn the mix adjustment screw
counterclockwise until the mix refrigeration cycles off.
4. Allow the mix temperature to stabilize and adjust
the setting if necessary.
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