Electrical Circuit - H.C Duke & Son Freedom 360 Degrees Series Operator’s Manual With Illustrated Parts List

INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
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10.2 The Electrical Circuit
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 The electrical operation of the system
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depends on the position of the MTS
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switch, selector switch and mode of
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operation. In the following discussion,
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five examples are considered.
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1) operation when the selector switch
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2) operation during the time that the
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 3) operation immediately after dis-
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4) operation when the selector switch
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5) operation of the pump when the
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Note the differences between the
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single-phase circuit and the three-
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phase circuit.
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NOTE: The following schematic shown
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(Figure 10-3) is for a standard 917N-
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CMT. Always refer to the schematic and
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wiring diagram supplied with the
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freezer.
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NOTE: If the head is removed, the
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magnetic head switch will be open,
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cutting power to the beater motor
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contactor coil.
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When the selector switch is in the
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"AUTO" position but product is not
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being dispensed, the refrigeration
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circuit is controlled by the cylinder
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 thermostat. Note that current cannot
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flow through the mechanical timer or
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the spigot switch circuit, when both are
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open. When the temperature in the
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cylinder exceeds the setting of its
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controlling thermostat, the thermostat
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contacts close, thus energizing the
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solenoid valve and releasing the flow of
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action also energizes the compressor
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contactor and beater motor starter
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coils, closing the points on the
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contactors.
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36
is in the "AUTO" position but
product is not being dispensed
product is being dispensed
pensing the product
is in the "CLEAN" position
MTS switch (mix) is in the "ON"
position.
When the operator is dispensing product,
the spigot switch closes the contacts 1-2
on the solid state timer. This in turn
energizes the coils on the contactors for
the beater motor, compressor, and cylin-
der solenoid.
When the operator closes the spigot to
shut off the flow of product, the spigot
switch opens which starts the time delay
period. The time delay contacts will
remain closed for a period of 12 seconds
after dispensing. The purpose of this
delay is to refrigerate the new mix that
entered the freezing cylinder when the
frozen product was dispensed. Control of
the refrigeration circuit is returned to the
thermostat at the end of the 12 second
period.
When the selector switch is in the
"CLEAN" position, the refrigeration circuit
is de-energized and only the beater motor
starter and beater motor are energized.
The mechanical timer bypasses the
thermostat, forcing the compressor and
beater motor to run up to 3 minutes. This
timer is used for quick start-ups or fast
recovery when dispensing large portions.
Important:
Excessive use of the mechanical timer
can causes freeze-up and damage to
the freezer.
When the mix switch is in the "ON" posi-
tion the mix motor relay coil is energized
through the mix pressure switch and
magnetic slide switch. The mix motor is
then energized through the mix motor
relay points. When the mix pressure
switch opens the mix motor relay coil is
de-energized and the mix motor stops.
184617-02