Stoelting U421-309I2 Service Manual

Model U421 & U431

(Ser. #6374 Plus)

Operator’s Manual

513725 Rev.0

Section 1: Introduction

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

This manual provides basic information about the machine. Instructions and suggestions are given covering its operation and care.

The illustrations and specifications are not binding in detail. We reserve the right to make changes to the machine without notice, and without incurring any obligation to modify or provide new parts for machines built prior to date of change.

DO NOT ATTEMPT to operate the machine until instructions and safety precautions in this manual are read completely and are thoroughly understood. If problems develop or questions arise in connection with installation, operation, or servicing of the machine, contact Stoelting.

		Stoelting Foodservice Equipment	Customer Service: 888.319.9549
		502 Highway 67	Fax: [phone]
		Kiel, WI 53042-1600	Email: [e-mail]
		U.S.A.
stoeltingfoodservice.com
		Main Tel: [phone]	© 2017 Stoelting
		Fax: [phone]

2	U421-I2 & U431-I2 OPERATOR’S MANUAL	513725 REV.0

Section 1: Introduction

This manual is divided into the following five sections:

INTRODUCTION

OPERATION

A.Parts of the Machine

B.Specifications

A.Empty the Freezing Cylinders - Start here if cleaning a machine with mix in it

B.Disassemble Parts - Start here if cleaning an empty machine

C.Cleaning Disassembled Parts

D.Cleaning the Machine

E.Assembling the Machine

F.Sanitizing

G.Freeze Down

H.Brushes for Cleaning

I.Lubrication Points

J.Pump Hose Routing

	MAINTENANCE	A. Mix Pump Hose Replacement
		B. Mix Pump Hose Cleaning
		C. Fine Consistency Adjustment
		D. Daily Procedures - Night
		E. Daily Procedures Morning
	TROUBLESHOOTING	A. Troubleshooting Flow Charts
	PARTS	A. Auger Shaft & Front Door Parts
		B. Cab Tubing

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

513725 REV.0	U421-I2 & U431-I2 OPERATOR’S MANUAL	3

Section 1: Introduction

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

A. Parts of the U421-I2 Machine

IntelliTec2™

Spigot Handle

Front Door

Gate Handles

Freezing Cylinder

Cabinet

IntelliTec2™ Touchpad

PARTS

The U421 has two types of spigot handles, gate and pull-down. The gate style is opened by moving the handle to the left. The pull-down style is opened by pulling downwards.

This manual shows the pull-down handles which are self-closing. The gate style handles need to be closed when finished dispensing.

4	U421-I2 & U431-I2 OPERATOR’S MANUAL	513725 REV.0

Section 1: Introduction

B. U421-I2 Specifications

U421-I2 A/C

U421-I2 A/C Remote

U421-I2 W/C

Dimensions

Machine

with crate

Machine

with crate

Machine

with crate

width

26-3/4’’

34’’

26-3/4’’

34’’

26-3/4’’

34’’

(67,9 cm)

(86,4 cm)

(67,9 cm)

(86,4 cm)

(67,9 cm)

(86,4 cm)

height

68-3/4’’

78’’

67-3/4’’

78’’

67-1/2’’

78’’

(174,6 cm)

(198,1 cm)

(172,1 cm)

(198,1 cm)

(171,5 cm)

(198,1 cm)

depth

39-1/2’’

48’’

39-3/4’’

48’’

39-1/2’’

48’’

(100,3 cm)

(121,9 cm)

(101,0 cm)

(121,9 cm)

(100,3 cm)

(121,9 cm)

Weight

785 lbs

930 lbs

760 lbs

930 lbs

760 lbs

930 lbs

(356,0 kg)

(421,8 kg)

(344,7 kg)

(421,8 kg)

(344,7 kg)

(421,8 kg)

Electrical

1 PH

3 PH

1 PH

3 PH

1 PH

3 PH

circuit ampacity

32A

20A

36A Left /

20A

32A

20A

(per barrel)

31A Right

overcurrent protection

50A

30A

50A Left /

30A

50A

30A

device (per barrel)

45A Right

The machine requires one dedicated electrical circuit per barrel.

Compressor

Two - 19,000 Btu/hr

Cabinet - 1,300 Btu/hr Compressor (R-134a)

Drive Motor

Two - 2 hp

Water cooled units require 1/2” N.P.T.

water and drain fittings. Maximum water

Cooling

Air cooled units require 6” (15,2 cm) air

Remote air cooled requires two remote

pressure of 130 psi. Minimum water flow

condensers and two precharged line

rate of 3 GPM per barrel. Ideal EWT of

space on all sides and open at the top.

sets.

50°-70°F. The machine requires 6” (15,2

cm) air space on all sides for the cabinet

refrigeration system.

Cabinet Volume

Two - 8 gallon (30,28 liters)

Freezing Cylinder

Two - 1.33 gallon (5,03 liters)

Volume

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

513725 REV.0	U421-I2 & U431-I2 OPERATOR’S MANUAL	5

Section 1: Introduction

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

C. Parts of the U431-I2 Machine

Spigot Handle

IntelliTec2™

Front Door

Gate Handles

Freezing Cylinder

Cabinet

IntelliTec2™ Touchpad

PARTS

The U431 has two types of spigot handles, gate and pull-down. The gate style is opened by moving the handle to the left. The pull-down style is opened by pulling downwards.

This manual shows the pull-down handles which are self-closing. The gate style handles need to be closed when finished dispensing.

6	U421-I2 & U431-I2 OPERATOR’S MANUAL	513725 REV.0

Section 1: Introduction

D. U431-I2 Specifications

U431-I2 A/C

U431-I2 A/C Remote

U431-I2 W/C

Dimensions

Machine

with crate

Machine

with crate

Machine

with crate

width

26-3/4''

34''

26-3/4''

34''

26-3/4''

34''

(67,9 cm)

(86,4 cm)

(67,9 cm)

(86,4 cm)

(67,9 cm)

(86,4 cm)

height

68-3/4''

78''

67-3/4''

78''

78''

67-1/2''

(174,6 cm)

(198,1 cm)

(172,1 cm)

(198,1 cm)

(171,5 cm)

(198,1 cm)

depth

39-1/2''

48''

39-3/4''

48''

48''

39-1/2''

(100,3 cm)

(121,9 cm)

(101,0 cm)

(121,9 cm)

(100,3 cm)

(121,9 cm)

Weight

785 lbs

935 lbs

760 lbs

930 lbs

760 lbs

930 lbs

(356,0 kg)

(424,1 kg)

(344,7 kg)

(421,8 kg)

(344,7 kg)

(421,8 kg)

Electrical

1 PH

3 PH

1 PH

3 PH

1 PH

3 PH

circuit ampacity

32A

20A

36A Left /

20A

32A

20A

(per barrel)

31A Right

overcurrent protection

50A

30A

50A Left /

30A

50A

30A

device (per barrel)

45A Right

The machine requires one dedicated electrical circuit per barrel.

Compressor

Two - 19,000 Btu/hr

Cabinet - 1,300 Btu/hr Compressor (R-134a)

Drive Motor

Two - 2 hp

Water cooled units require 1/2" N.P.T.

water and drain fittings. Maximum water

Cooling

Air cooled units require 6" (15,2 cm) air

Remote air cooled requires two remote

pressure of 130 psi. Minimum water flow

condensers and two precharged line

rate of 3 GPM per barrel. Ideal EWT of

space on all sides and open at the top.

sets.

50°-70°F. The machine requires 6" (15,2

cm) air space on all sides for the cabinet

refrigeration system.

Cabinet Volume

Two - 8 gallon (30,28 liters)

Freezing Cylinder

Two - 1.33 gallon (5,03 liters)

Volume

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

513725 REV.0	U421-I2 & U431-I2 OPERATOR’S MANUAL	7

Section 2: Operation

INTRODUCTION	A. Empty the Freezing Cylinders
			A.1
			Turn o freezing cylinders.

OPERATION
		In the	cab, remove the mix
		A.2
		pickup assemblies and place
		them in a bucket filled with cool
		tap water.
MAINTENANCE		Remove the mix containers
		and covers.
			NOTE
		Optional: Fill the bucket with Stera Sheen
TROUBLESHOOTING		solution to make cleaning parts easier
		after disassembly.
		frequency.
			NOTE
		Clean mix containers on a regular basis.
		Refer to State and local health codes for
		A.3
PARTS		Press the Clean buttons.

A.4

Open spigots to drain product into a container until the container is full. Empty the container and repeat until product has been drained from the freezing cylinders.

A.5

Refill the bucket in the cab with cool tap water (or Stera Sheen). Allow the freezing cylinders to fill then drain the water into a container. Repeat until the water draining from the freezing cylinders is clear.

NOTE

If the “Clean Time Exceeded” warning is displayed on the IntelliTec2™, turn the freezing cylinder on and o again and press the Clean button to clear the warning.

A.7

Remove any remaining water from the bucket in the cabinet.

Drain the water and press the Clean buttons to stop the augers.

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Section 2: Operation

A.8

Remove the buckets in the cab and turn on the pumps to clear any remaining liquid in the hoses.

Open the spigots to drain the freezing cylinders.

A.9

Press and hold the Main Freezer Power button for three seconds to turn o the power.

B. Disassemble Parts

Before using the machine for the first time, complete machine disassembly, cleaning and sanitizing procedures need to be followed. Routine cleaning intervals and procedures must comply with the local and state health regulations. Inspection for worn or broken parts should be made at every disassembly of the machine. All worn or broken parts should be replaced to ensure safety to both the operator and the customer and to maintain good machine performance and a quality product. Check the wear line on the auger flights on a regular basis and replace as needed.

Auger Flight Wear

1. Front Door Disassembly

B.1

Remove the spigot extensions or rosette caps if installed.

Unscrew the knobs on the front door and remove the door.

B.2

Remove the front door o-rings and remove the spigots from the front door.

B.3

Remove the air bleed valve from the front door.

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

513725 REV.0	U421-I2 & U431-I2 OPERATOR’S MANUAL	9

Section 2: Operation

INTRODUCTION		B.4
		Remove all o-rings from
		parts by first wiping o the
		lubrication using a clean
		towel. Then squeeze the
		o-ring upward to form a
		loop. Roll the o-ring out of
		the groove.

OPERATION	2. Removing Auger
			B.5
			Remove		front auger
			supports and bushings
			and remove the augers
			fromthefreezingcylinders.
MAINTENANCE			As the augers are being
			pulled out, remove the
			plastic flights with springs.
			B.6
			Wipe any remaining
			lubricant o the hex end
TROUBLESHOOTING			of the auger and remove
			the rear seal assembly
			and o-ring. Wipe any
			remaining		lubricant o
			the o-ring and auger.
			Remove the rear seal
			adapter from the rear seal.
			B.7
PARTS			Unscrew		springs
			from the		auger
			flights.

3. Disassemble Pump Hose

B.8

Disconnect the sensor connectors from the pickup assemblies and unscrew the hose clamps nearest the assemblies.

Remove the mix pickup assemblies.

B.9

Remove the lock clips from the check valves and remove the check valves and springs.

Detach the check valvefromthespring.

B.10

Remove the o-rings from the assemblies.

B.11

If the pump hoses require cleaning and inspection, follow the steps in Section 3.

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Section 2: Operation

C. Cleaning Disassembled Parts D. Cleaning the Machine

Disassembled parts require complete cleaning, sanitizing and air drying before assembling. Local and state health codes will dictate the procedure required. Some state health codes require a four sink process (pre-wash, wash, rinse, sanitize, air dry), while others require a three sink process (without the prewash step). The following procedures are a general guideline only. Consult your local and state health codes for the procedures required in your location.

C.1

Place all parts in 90° to 110°F (32°C to 43°C) mild detergent water and wash thoroughly. Use the brushes that shipped with the machine to clean all holes in the front door, flights, mix pickup assembly, etc.

NOTE

Be sure to use the brushes that shipped with the machine to properly clean the parts.

C.2

Rinse all parts with clean 90° to 110°F (32°C to 43°C) water. Then place all parts in a sanitizing solution for at least 1 minute, then remove and let air dry completely before assembling in machine.

D.1

Using adetergent solution and the large barrel brush provided, clean the freezing cylinders by dipping the brush in the solution and brushing the inside of the freezing cylinders.

Make sure to thoroughly clean the rear seal surfaces on the inside of the freezing cylinders.

D.2

Wrap the brush in a clean cloth and thoroughly dry the freezing cylinder.

D.3

Remove the drain tray from the side of the machine. Remove the drip tray from the front panel. Clean and replace the trays.

D.4

The exterior of the machine should be kept clean at all times to preserve the luster of the stainless steel. A high grade of stainless steel has been used on the machine to ease cleanup. To remove spilled or dried mix, wash the exterior with 90° to 110°F (32°C to 43°C) mild detergent water and wipe dry.

Do not use highly abrasive materials, as they will mar the finish. A mild alkaline cleaner is recommended. Use a soft cloth or sponge to apply the cleaner. For best results, wipe with the grain of the steel.

INTRODUCTION

OPERATION

TROUBLESHOOTING MAINTENANCE

PARTS

513725 REV.0	U421-I2 & U431-I2 OPERATOR’S MANUAL	11

Section 2: Operation

INTRODUCTION	E. Assembling Machine
				NOTE
			Total Blend or equivalent must be used
			when lubrication of machine parts is
			specified.
			The USDA and FDA require that lubricants
			used on food processing equipment must
OPERATION			be certified for this use. Use lubricants
			only in accordance with the manufacturer’s
			instructions.
				NOTE
			Stoelting recommends allowing the parts
MAINTENANCE			to air dry before assembling.
			sanitary	lubricant.
			E.1
			Install the rear seal o-rings onto the augers. Lubricate
			the outside of the o-rings with a generous amount of
TROUBLESHOOTING

PARTS

E.2

Install the stainless steel adapter into the rear seal WITHOUT LUBRICANT. Then lubricate the inside of the adapter and install it onto the auger.

DO NOT lubricate the outside of the rear seal.

E.3

Lubricate the hex end of the auger with Total Blend.

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