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INSTALLATION AND SERVICE MANUAL 959R
184981-02
27
The electrical operation of the system
depends on the position of the selector
switch and mode of operation. In the
following discussion, four examples are
considered.
1) operation when the selector switch is
in the "AUTO" position but product is
not being dispensed
2) operation during the time that the
product is being dispensed
3) operation immediately after dispens-
ing the product
4) operation with the switch in the
"CLEAN" position
NOTE
: The following schematic shown
(Figure 9-2) is for a standard 959R.
Always refer to the schematic and wiring
diagram supplied with the freezer .
Note the differences between the single-
phase circuit and the three-phase circuit.
If the head is removed, the magnetic
head switch will be open, cutting power
to the beater motor.
When the switch is in "AUTO" but prod-
uct is not being dispensed, the refrigera-
tion circuit is controlled by the cylinder
thermostat. Note that current cannot flow
through the time delay contacts or the
micro-switch or circuit, because both are
open at this time. When the temperature
in the cylinder exceeds the setting of
its
controlling thermostat, the thermostat
contacts close, thus energizing the
solenoid valve and releasing the flow of
refrigerant to the cylinder coils. This
action also energizes the compressor
contactor and beater motor starter coils,
closing the points on the contactors.
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 contacts 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.
9.2 The Electrical Circuit