Stoelting F431 - Manual (Page 31)

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SECTION 4
MAINTENANCE INSTRUCTIONS
4.1 PRODUCT CONSISTENCY ADJUSTMENT
The freezer's control system monitors the consistency
(firmness) of the product (mix) in each freezing cylinder.
The program module senses the consistency of the prod-
uct and shuts off the drive motor and refrigeration system
when the pre-programmed consistency is reached. The
control panels on the front of the freezer allow the operator
to adjust each freezing cylinder to create the desired
product consistency.
A. Place the Main Freezer Power and Freezing Cylinder
OFF/ON switches in the ON position.
B. Press the SET button on the Control Panel once.
Fine Adj will appear on the LCD screen.
C. Press the up arrow button
(⇑) (⇑) (⇑) (⇑) (⇑) until the desired consis-
tency setting is displayed. The higher the number, the
greater the product consistency. The control may be set
from 1 to 9. Each time the up arrow
(⇑) (⇑) (⇑) (⇑) (⇑) button is
pressed, the value will increase by 1 until the value
reaches 9, then restart at 0. The 0 setting cannot be set.
D. Press the SET button once to save the setting change
and return to the current mode display.
Figure 28. Product Conststency Control
4.3 OVERRUN ADJUSTMENT
The product when served is a combination of air and mix.
Overrun is a measure of the amount of air blended into the
mix.
Overrun can be expressed in terms of the amount of weight
loss for a given volume. For example, if a pint of liquid mix
weighs 18 ounces (510 grams) and a pint of frozen product
with air added weighs 12 ounces (340 grams), the overrun
is said to be 50 percent "18 oz. (510 grams) - 12 oz. (340
grams) = 6 oz. (170 grams)", (6 /12) x 100 = 50%.
The overrun can be checked by placing a one pint
container on an ice cream scale and zeroing out the scale.
Then fill a one pint container with frozen product. The
container should be filled over the top and leveled with a
straightedge. The product should not contain any air
pockets. When weighed on an ice cream scale, one pint
(473 milliliters) of product should weigh 12 to 13 ounces
(340 to 368,5 grams).
The mix pump has been preset at the factory to produce
a product with approximately 40% overrun. Because of
differences in mix formulation, temperatures and baromet-
ric pressure, this figure may vary. It will be necessary for
approximately 2 gallons (7,5 liters) of mix to be pumped thru
the freezer before changes in the product are noticeable
due to adjustments in overrun.
Overrun is controlled by the length of the air compressor
piston stroke within the piston cylinder. Lengthening the
stroke within the cylinder will increase overrun. Con-
versely, shortening the stroke will decrease overrun. To
perform an overrun adjustment, refer to the following
procedure:
A. Turn the mix pump switch to the OFF position.
Disconnect both power sources/circuit breakers.
B. Remove the lower back panel from freezer.
C. On air compressor side of pump, locate the long/
slender piston rocking arm. The rocking arm down-
ward travel is limited by a stationery cam. On the
face of the cam there is an overrun setting indicator
plate numbered 3 thru 8 and an adjustment knob.
Figure 29.
Overrun Adjustment
К К К К К
Figure 29. Overrun Adjustment
Fine Adj
1-9 5
4.2 LOCKING OUT CONTROL PANEL
The IntelliTec control has a tamper proof mode to prevent
unauthorized use. When set, all buttons on the control
panel are disabled. To lock out the control panel:
A. Press and hold the PUSH TO FREEZE button for 5
seconds.
B. While still holding the PUSH TO FREEZE button, press
the CLEAN button once.
C. Release both buttons. An astrisk (*) will apear after the
word MODE on the display, indicating that the control
is in the lock out mode.
D. To unlock the control panel, repeat steps A, B and C.