Vollrath 219-02 - Manual (Page 15)

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2. On piston UP stroke, air inlet check valve (C) is
forced shut and air is moved out of air outlet
valve (D) into mix transfer tube bottom (F) and
into the freezing chamber.
E. Relief Valve Operation:
1. The relief valve (E) opens and releases pressure
if the pressure switch fails to shut off the pump
motor.
3.5 CLEANING
The mix pump must be cleaned when changing mix or
whenever the freezer is shut off for an extended period,
such as overnight or on nonbusiness days. For sanitary
reasons, mix must not be allowed to remain in the freezer
lines or mix pump when the freezer is not in operation.
NOTE
Refer to the freezer manual for freezer cleaning
procedures.
A. On remote models, remove suction tubing from the
mix container. Draw off all or most of the mix remaining
in the freezer barrel.
B. Pump 3 gallons (11 liters) of cold potable water thru
freezer until water at spigot is free of mix.
C. Pump 3 gallons (11 liters) of warm detergent solution
water thru freezer . The use of sof t water is
recommended along with dishwashing detergents
such as “Joy”, “Dawn”, or equivalent.
D. Place mix pump switch in OFF position.
E. Disassemble pump parts. (See Section 3.6.) Then
place all parts in warm, mild detergent water and wash
thoroughly using brushes provided. Again, the use of
soft water is recommended along with dishwashing
detergents such as “Joy”, “Dawn”, or equivalent. Rinse
all parts with clean hot water.
NOTE
If the mix lines or air lines are difficult to remove,
soften with hot water or a rag soaked in hot water.
Hose connections may be sprayed with Haynes
Sanitary Lubricant for ease of removal.
F. Use a sanitizing solution of 100 parts per million to
sanitize the parts before assembly. Use “Stera-Sheen
Green Label Sanitizer and Cleaner”, or others in
accordance with Health Inspection Requirements.
G. Place all parts in the sanitizing solution for 5 minutes,
then remove and let air dry.
Figure 4. Pump Operation
AIR & MIX
AIR & MIX
OUTLET
MIX
TRANSFER
TUBE TOP
AIR
INLET
TO
PRESSURE
SWITCH
CYLINDER
TOP
MIX
AIR
“O” RING
SEAT
CYLINDER
MIX
INLET
QUAD
RING