Vollrath U421 Water Cooled - Manual (Page 20)

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G. The refrigeration is automatically actuated when the
spigot is opened. For normal dispensing, open the
spigot no more then 90°. (This is when the handle
knob is pointed directly away from the front door.)
This position provides excellent control over the prod-
uct and aids in making desired shaped portions.
Close spigot completely after dispensing.
It is possible to overdraw if rate of draw is exceeded for
extended periods. If the freezer is overdrawn, the result
will be a soft product and air pops. To draw a quart prop-
erly, it is necessary to use a little more than one minute.
During normal operation it is not necessary to be overly
concerned about capacity. But, if there is an order for six
products at one time, each using 9 ounces (266 milli-
liters) of product, it should be considered as 54 ounces
(1,60 liters) of product. Approximately two minutes must
be allowed for this drawing. After a while most operators
will sense, or feel, when the freezer is beginning to fall
behind, and will slow up on the rate of draw so as not to
exceed capacity.
3.5 MIX INFORMATION
Mix can vary considerably from one manufacturer to
another. Differences in the amount of butter-fat content and
quantity and quality of other ingredients have a direct
bearing on the finished frozen product. A change in freezer
performance that cannot be explained by a technical
problem may be related to the mix.
Proper product serving temperature varies from one
manufacturer's mix to another. Mixes should provide a
satisfactory product in the 17° to 20°F (-8,3° to -6,6°C)
range.
When checking the temperature, stir the thermometer in
the frozen product to read the true temperature.
Mix does not improve with age. Old mix, or mix that has
been stored at too high a temperature, can result in a
finished product that is less than satisfactory from the
appearance and taste standpoint. To retard bacteria growth
in dairy based mixes, the best storage temperature range
is between 36° to 40°F (2,2° to 4,4°C).
3.6 OPERATION OF MIX PUMP
The PUMP switch is located on the front of the freezer.
When the pump switch is placed in the ON position, the
mix pump motor will be actuated to pump mix into the
freezer cylinder. When the set pressure is reached, the
mix pump will shut off automatically. When the switch is
placed in the OFF position, the mix pump will be inopera-
tive.
NOTE
The mix pump motor is equipped with an internal
overload that will "kick-out" when the motor is over-
loaded. Consult the trouble shooting section for
corrective information. The internal overload will
automatically reset after cooling. If the condition con-
tinues, contact a qualified service person.
The pump hose must be repositioned every 1 - 2 weeks or
60 hours of operation. Failure to comply will result in
reduced mix pump liquid capacity, dispense stoppage,
popping, and possible mix pump hose leakage.
Find a system that works for you. Operating until hose
breaks shortens pump life, causes downtime and in-
creased cleaning costs.
A. Mix Operation: The peristaltic mix pump contains
one continuous mix pump hose. When looking at the
face of the peristaltic mix pump, the left side of the
hose is the suction or pickup. The right side of the
hose is the discharge. Mix is drawn up the suction
side of the hose and transferred thru the discharge
side to the freezer. Figure 15.
B. Air Operation: The air compressor operates concur-
rently with the peristaltic mix pump. Air enters thru a
check valve on the piston downstroke. The air is
discharged thru a second check valve, on the piston
upstroke. The air and mix join at the tee and then
travel to the freezer.
Figure 15. Mix Pumps
Й Й Й Й Й
Pressure
Switch
Manifold
Mix
Discharge
4 Way Tee
Ж Ж Ж Ж Ж
К К К К К
Mix
Intake
Ж Ж Ж Ж Ж
ЖЖЖЖЖ
Hose Holder