8
Controls
Model 161
Generation II Control Logic Board
The Generation II logic board’s primary function is to
interpret modes of operation. The board monitors
mix levels and temperatures by sending commands
to the control’s power board. Commands are sent
via a ribbon cable, enabling the proper relays on the
power board to open or close. (See Control
Overview illustration on page 16.)
Function
Interpret a mode of operation/monitor mix level and
temperature/monitor product viscosity or product
temperature and send a command to the power
board through a ribbon cable enabling the proper
relays on the power board to be open or closed.
Logic Board (Part Numbers)
As of July, 1996 we have modified the differential on
Generation II controls from 13°F/7.2°Cto
4.5°F/2.5°C in order to meet the new NSF mix
temperature requirements. The new control has a
shunt (jumper) to select proper temperatures. This
shunt is located beneath the dip switches on the left
side of the control. The shunt is set in the upper
position for 4.5°F/2.5°C differential for use on mix
hopper systems and in the lower position for
13°F/7.2°C differential for use on mix cabinet
systems. The new control is compatible with older
units. This change will require new part numbers as
follows:
Old Part No. New Part No.
X36641-SER Gen. II X36641SER1
X38523-SER Gen. II-W/Chime X38523SER1
Power Board (Part Number)
X32326-SER
Thermistor Probes
There are two types of thermistor probes used on
model 161 freezers. The resistance value of the
thermistor probes corresponds with the temperature.
As the temperature becomes warmer, the probe
resistance decreases.
X31602 - Barrel Probe (Senses temperature
of product in freezing cylinder.)
X55540 - Hopper Probe (Senses temperature
of mix in hopper.)
Approximate probe resistance readings:
10,000 OHMS at room temperature (77_F/25_C).
30,035 OHMS at hopper temperature (35_F/2_C).
48,636 OHMS at soft service temperature
(18_F/-7.7_C).
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