7
3.1 SAFETY PRECAUTIONS
Do not attempt to operate the U3 pump until the safety
precautions and operating instructions in the manual are
read completely and thoroughly understood.
Take notice of all warning labels on the U3 pump. The
labels have been put there to help in maintaining a safe
working environment. The labels are designed to withstand
washing and cleaning. All labels must remain legible for
the life of the mix pump. Warning labels should be checked
periodically to be sure they have not been removed,
painted over, rubbed off, and can be recognized as warning
labels.
If replacement labels are needed, indicate the part number,
type of label, location of label, and quantity required. Mail
your name and address to:
STOELTING, LLC
ATTENTION: Customer Service
502 Hwy 67
Kiel, Wisconsin 53042
Labels will be furnished and mailed at no charge.
SAFE OPERATION IS NO ACCIDENT; Observe these
rules:
A. Know the U3 pump - read and understand the
Owner’s Manual.
B. Wear proper clothing - avoid loose fitting garments,
and remove watches, rings or jewelry which could
cause a serious accident.
C. Maintain a clean work area - avoid tripping or slipping
by cleaning up the area and keeping it clean.
D. Stay alert at all times - know which switch, push
button or control you are about to use and what effect
it is going to have.
E. Turn all switches to OFF prior to making any adjust-
ments.
F. Do not attempt to repair or perform maintenance on
the mix pump until the main electrical power has
been disconnected.
G. Do not operate the mix pump if unusual or
excessive noise or vibration occurs.
3.2 PUMP MOTOR SWITCH
The PUMP MOTOR switch (Fig. 4) is located on the mix
pump assembly. When the pump motor 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 pump motor 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 “kick-out” when the motor is over-
loaded. Consult the trouble shooting section for cor-
rective information.The internal overload will auto-
matically reset after cooling. If the condition contin-
ues, contact a qualified service person.
3.3 OPERATION OF U3 MIX PUMP
SECTION 3
OPERATION INSTRUCTIONS
Figure 4
Pump Motor Switch
This section describes the operation of the U3 mix pump.
NOTE
Mix pump hose must be repositioned every 1 -
2 weeks.
Failure to comply will result in reduced
mix pump liquid capacity, dispense stoppage, pop-
ping, and possible mix pump hose leakage. Ref. to
Note from Section 4.2.
A. Refer to freezer owners manual for the operation of
the freezer.
B. 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 this
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 (Fig. 5).
C. Air Operation: The air compressor operates concur-
rently with the peristaltic mix pump. Air enters thru
an internal check valve on the piston downstroke.
The air is discharged thru a second internal check
valve, and an external check valve on the piston
upstroke. The air and mix join at the tee and then
travel to the freezer.
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