3.12 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 “trip”, disabling the pump when the motor is overloaded. Consult the trouble shooting section for corrective information.The internal overload will automatically reset after cooling. If the condition 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 assembly 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 22).

B.AirOperation:Theaircompressoroperateswhenever 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.

 

Æ

 

Hose

Mix

Holder

Mix

Intake Æ

Æ Discharge

C.The over-run adjustment is preset at the factory. If an adjustment becomes necessary, refer to Section 4.

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 thepumpandconnectingtubingevery14daysforinspection 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 CLEAN-OFF-SERVE switch in CLEAN posi- tion. 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.Place CLEAN-OFF-SERVE switch in OFF position.

3.14DISASSEMBLY 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.

Æ

Figure 22. Mix Pumps

3-way Tee

CAUTION

System Under Pressure

Never disconnect hoses from freezer or pump without first opening spigot to relieve pressure.

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