Stoelting F431 - Manual (Page 28)

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C. The over-run adjustment is preset at the factory. If an
adjustment becomes necessary, refer to Section 4.
Figure 23. Mix Pumps
Air Line
Mix
Discharge
3-way
Tee
Mix
Intake
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3.12 OPERATION OF MIX PUMP
The mix pump switch is located in the upper left hand
corner, inside the refrigerated cabinet. 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 inoperative.
NOTE
The mix pump motor is equipped with an internal
overload that will “trip”, disabling the pump when the
motor is overloaded. Consult the trouble shooting
section for corrective information.The internal over-
load will automatically reset after cooling. If the con-
dition continues, contact a qualified service person.
CAUTION
Risk of Product Damage
Mix 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 stop-
page, popping, and possible mix pump hose leak-
age. Hose leakage may damage the pump roller as-
sembly and void the factory warranty.
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 (see Figure 23).
B. Air Operation: The air compressor operates whenever
the peristaltic mix pump is running. 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.
NOTICE
Any cleaning procedure must always be followed
by sanitizing before filling freezer with mix. (Refer to
section 3.3)
3.13 MIX PUMP CLEANING
The mix pump is approved for CIP (clean in place) and is
thoroughly cleaned as cleaning solutions are pumped thru
the freezer. We recommend completely disassembling
the pump and connecting tubing every 14 days for inspection
of parts to confirm the CIP has been properly performed. If
any residue is detected clean or replace those parts as
outlined below.
1. Place the OFF-ON switch in the ON position and
press the CLEAN switch. Allow the auger to agitate
for 5 to 10 minutes.
2. Remove suction tube from mix container. Draw off the
mix remaining in freezer barrel.
3. Pump 2 gallons (7.5 liters) of cold potable water thru
freezer until water at spigot is free of mix.
4. Pump 2 gallons (7.5 liters) of 90° to 110°F (32°C to
43°C) detergent solution water thru freezer. The use
of soft water is recommended, along with dishwashing
detergents such as “Joy,” “Dawn,” or equivalent.
5. Place mix pump switch in OFF position. Open spigot
to relieve remaining pressure.
6. Press the CLEAN switch to stop the auger and place
the OFF-ON toggle switch in the OFF position.
3.14 DISASSEMBLY AND INSPECTION OF
REMOVABLE PARTS
Inspection of removable parts should be made whenever
maintenance is performed or pump requires disassembly.
WARNING
Hazardous Moving Parts
Revolving pump head can grab, mangle, and cause
serious crushing injury. The Power switch must be
placed in the OFF position for cleaning and power
must be disconnected when disassembling or
servicing.
CAUTION
System Under Pressure
Never disconnect hoses from freezer or pump without
first opening spigot to relieve pressure.
Air/mix to
Freezing Cylinder
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