Electrical Circuit - H.C Duke & Son 959R Operator’s Manual With Illustrated Parts List

Twin twist soft serve freezer

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9.2

The Electrical Circuit

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The electrical operation of the system

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depends on the position of the selector

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switch and mode of operation. In the

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following discussion, four examples are

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considered.

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1) operation when the selector switch is

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2) operation during the time that the

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3) operation immediately af ter dispens-

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4) operation with the switch in the

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NOTE: The following schematic shown

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(Figure 9-2) is for a standard 959R.

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Always refer to the schematic and wiring

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diagram supplied with the freezer .

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Note the differences between the single-

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phase circuit and the three-phase circuit.

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If the head is removed, the magnetic

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head switch will be open, cutting power

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to the beater motor.

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When the switch is in "AUT O" but prod-

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uct is not being dispensed, the refrigera-

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tion circuit is controlled by the cylinder

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thermostat. Note that current cannot flow

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through the time delay cont acts or the

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micro-switch or circuit, because both are

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open at this time. When the temperature

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in the 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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refrigerant to the cylinder coils. This

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action also energizes the compressor

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contactor and beater motor starter coils,

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closing the points on the contactors.

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184981-02

in the "AUTO" position but product is

not being dispensed

product is being dispensed

ing the product

"CLEAN" position

INSTALLATION AND SERVICE MANUAL 959R

When the operator is dispensing prod-

uct, the spigot switch closes the contacts

1-2 on the solid state timer . This in turn

operates the beater motor and compres-

sor contactors for the beater motor and

compressor.

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 contact s will

remain closed for a period of 5 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 5

second period. Freezer will then run the

beater motor for 15 seconds on the

beater motor delay on break timer and

recycle if not drawn from in 31 minutes

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.

NOTE: Refer to the sep arate instruction

manual for pump operation.

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