Vollrath STOELTING U421-I2A Service Manual Download Page 38

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Service Manual #513721

U421-I2A & U431-I2A Model Machines

231047

231047

5.10 ELECTRICAL

Quantity

Part

Description

U421

U431

229148

Cable - IntelliTec2 (Control Board to Display Board)

USB Cable Extension

Capacitor - Start (#

231047

Capacitor - Run (#

Plug - USB (Rubber Push-In)

292353

Connector - 9 Pin Phoenix (#

521513

Board)

292354

Connector - 8 Pin Phoenix (#

521514

Board)

292355

Connector - 9 Pin Phoenix (#

521514

Board)

292356

Connector - 6 Pin Phoenix (#

521514

Board)

292357

Connector - 6 Pin Phoenix (Low Mix) (#

521513

Board)

292358

Connector - 6 Pin Molex (Thermistor) (#

521513

Board)

292359

Connector - 8 Pin Molex (Switch Input) (#

521513

Board)

295017

Contactor (45CG20AG) (IntelliTec2)

332563

Board - Display Module (Display Only)

431278

Harness - Board Service

431279

Harness - Board Service

521435

WiFi Module (-WF Models Only)

521513

Board - Program / Power (IntelliTec2)

521514

Board - Relay (IntelliTec2)

521516

Board - Program / Relay (IntelliTec2)

593093

Power Supply - LED Light

Relay (#282082, #

Compressors)

Plug-In Relay (New Cab Units)

718537

Switch - Limit (Door Safety)

719127-SV

Switch - Membrane Strip (Touchpad & Ribbon)

732374

Socket - Plug In Relay (New Cab Units)

2203058

Switch Assembly - Door Interlock

2205318

Switch Assembly - Door Interlock

Electrical Box

Header Panel

Summary of Contents for STOELTING U421-I2A

Page 1: ...Model U421 I2A U431 I2A SERVICE MANUAL Manual No 513721 Rev 0...

Page 2: ......

Page 3: ...dify or pro vide 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 thoroug...

Page 4: ...ecific safety information the following safety defini tions are provided to assist the reader The purpose of safety symbols is to attract your at tention to possible dangers The safety symbols and the...

Page 5: ...re Cutout 9 D Evaporator Pressure Regulator EPR 10 E Water Valve Water Cooled Models Only 10 2 7 Solenoid Air Cooled Remote Only 11 2 8 Filter Drier 12 3 Electrical and Mechanical Control Systems 3 1...

Page 6: ...arts 29 5 9 Spigots 31 5 10 Electrical 32 5 11 Motor 33 5 12 Cabinet Condensing Unit 34 5 13 Side View 35 5 14 Air Cooled Remote Condensers 36 5 15 Kits and Miscellaneous 37 6 Refrigeration Diagram an...

Page 7: ...product This manual is designed to assist qualified service per sonnel with troubleshooting and repairing the U421 I2A and the U431 I2A NOTE These machines are offered with two types of spigot handles...

Page 8: ...3 PH 1 PH 3 PH 1 PH 3 PH circuit ampacity per barrel 32A 20A 36A Left 31A Right 20A 32A 20A overcurrent protection device per barrel 50A 30A 50A Left 45A Right 30A 50A 30A The machine requires one ded...

Page 9: ...0 sec Sleep 2 CutIn 70 F Sleep 2 CutOut 54 F Default Off Time 900 sec Storage Storage Refrigeration Active Storage CutIn 39 F Storage CutOut 36 F Storage Offset 2 F Storage Off Time 4 min Storage On T...

Page 10: ...025 60 15325 0 85400 62 14550 2 80150 64 13825 4 75275 66 13150 6 70725 68 12500 8 66475 70 11875 10 62500 72 11300 12 58800 74 10750 14 55325 76 10250 16 52100 78 9750 18 49075 80 9300 20 46250 82 88...

Page 11: ...er systems are designed for use with R404A refrigerant and the cabinet system is designed for use with R134A refrigerant The proper charges are indicated on the information plate SECTION 2 REFRIGERATI...

Page 12: ...NOTE For qualified service personnel only Anybody work ing with refrigerants must be certified as a Techni cian TYPE I as required by 40 CFR 82 Subpart F and hold all State and or local refrigerant ha...

Page 13: ...compressor K Crimp and braze all open ports of the old compressor NOTE A compressor returned to Stoelting with any open ports void the warranty ALWAYS crimp and braze ports on a compressor that has b...

Page 14: ...is necessary for proper operation of the valve The bulb must also be well insulated A Connect a gauge to the Schrader valve on the suction line B Connect a thermocouple to the suction line next to th...

Page 15: ...ts backflow of refrigerant into the evapora tor If there is reversed flow the product in the freezing cylinder softens and liquid refrigerant can flood into the compressor on startup If a check valve...

Page 16: ...removing any panels for servicing B Remove the rear panel C Connect a gauge to the Schrader valve on the suction line between the cabinet evaporator and the EPR D Connect power to the machine E Turn t...

Page 17: ...to prevent pressure buildup during water valve installation D Braze the capillary tube into the system E Connect the water supply line and turn on the water supply F Check for leaks in the water line...

Page 18: ...gerationsystemifthesolenoid valve will not be replaced immediately within 10 minutes to prevent contamination SOLENOID VALVE REPLACEMENT Toreplacethesolenoid performthefollowingprocedures A Position t...

Page 19: ...tor to close When the spigot is opened or the Push To Freeze button is pressed the drive motor contactor closes After three seconds the compressor contactor closes 2 Check to ensure contactor is recei...

Page 20: ...ng 2 Removealeadfromoneofthecapacitorterminals 3 Using insulated pliers discharge the capacitor by connecting a 20K 5W resistor across the terminals NOTE Discharge the capacitor even if there is a ble...

Page 21: ...The fan motor is connected to a toggle switch mounted to the evaporator behind the right side panel The switch is connected to a buck boost transformer The switch must be set to the correct position b...

Page 22: ...an shroud and move it into place 12 Thread thermistor through hole in fan shroud and attach it to the clip 13 Install fan shroud into cab with the four screws 14 Installevaporatorcoverwiththetwothumbs...

Page 23: ...the spigot to relieve air pressure in the system 3 Connect a gauge between the 1 4 ID tubing and pump outlet in the cab 4 Turn on the pump motor 5 The motor should cutout when the gauge reads 24 psig...

Page 24: ...wires from the control board Measure the resistance of the sensor and compare it with the sensor resistance table If the resistance is not within this range replace it Figure 3 6 Temperature Sensor R...

Page 25: ...power cycled the machine returns to normal operation Very low and or fluctuating supply voltages typically cause this error The error can also be caused by faulty motor or starting components which co...

Page 26: ...pears if the sensor is out of range To remedy this error press the On Off button for the cylinder to turn it off then back on If the control panel still displays the error condition code refer to the...

Page 27: ...period of continuous running This usually occurs if there is a leak in the hose or if there is a low mix condition The error can also indicate a bad pressure switch ERROR CODE 12 LEFT HOPPER SENSOR Th...

Page 28: ...1 No mix in cabinet 1 Add mix to the cabinet 2 Drive motor overload tripped 2 Wait for automatic reset If condition contin ues see section 3 3 Drive belt failure 3 Replace drive belt 4 Freeze up Auge...

Page 29: ...Refrigerant Leak Check 1 1 324509 Decal Cleaning Instructions 1 1 324548 Decal Adequate Ventilation 6 1 1 324566 Decal Wired According To 1 1 324803 Decal Domed Stoelting Logo Purple Large Header Pane...

Page 30: ...ed Valve 2 2 694255 Spring Auger Flight 12 12 1151859 Adapter Rear Seal Code 1 2 2 2104552 Support Front Auger 2 2 2110116 Valve Air Bleed 2 2177427 Front Door 1 2183106 Valve Air Bleed 2 2187696 Door...

Page 31: ...umb Wire Basket 4 4 694247 Spring Check Valve 2 2 717962 Switch Pressure 2 2 756079 Tubing 3 8 ID Clear Mix Line 25 Increments Per Inch Cab 2 2 756088 12 Tubing 1 2 I D Clear Mix Line Pre Cut 12 Piece...

Page 32: ...Panel Upper L H Side 1 1 2203414 Panel Front Shroud 1 2203576 Panel Rear Top Air Cooled Remote 1 1 2203577 Panel Rear Bottom Air Cooled Remote 1 1 2203608 Panel Only Header Non DQ 1 2203708 Panel Only...

Page 33: ...2206948 Drawer Divider Stainless 3 3 2208030 Drawer Latch 3 3 2208045 Drawer Asembly includes Drawer Divider Ball Bearings Stainless 3 3 2208046 Drawer Only Stainless 3 3 2208161 Drawer Tub Plastic 2...

Page 34: ...r Cab 1 1 264243 Clamp Metal 3 8 ID Tubing Cab 1 1 266090 Clip LED Light Strip 1 1 355005 Evaporator Angled 1 1 493000 LED Light Strip 1 1 522000 Motor Fan 355005 Low Profile Evaporator 1 1 719123 SV...

Page 35: ...036 1171862 1171860 1171866 1171987 1171986 644065 1177681 1171955 1171981 1171866 1171983 1171982 652412 128283 1171979 1171956 1171991 1171978 1171989 650146 650146 1171980 1171990 1171984 1171871 1...

Page 36: ...ston Spring Seat Cab 2 2 1171873 Piston Pump Cab 2 2 1171874 Ball Bearing Single Pump Rocker Arm Cab 2 2 1171955 Set Screw Eccentric Cab 2 2 1171956 Washer Crank Arm Nylon Cab 2 2 1171958 Filter Air P...

Page 37: ...rsion Spigot Cam 2 3 718773 Switch Spigot 2 3 1154703 Washer Spigot Handle 4 2156997 Handle Weldment Center DQ Gate Style 3 2156999 Handle Weldment Left DQ Gate Style 1 2157850 Handle Weldment Right D...

Page 38: ...292356 Connector 6 Pin Phoenix 521514 Board 1 1 292357 Connector 6 Pin Phoenix Low Mix 521513 Board 1 1 292358 Connector 6 Pin Molex Thermistor 521513 Board 1 1 292359 Connector 8 Pin Molex Switch Inp...

Page 39: ...97 Belt Smooth A37KC 50 60 Hz 4 4 230622 Capacitor Start 522856 Motor 2 2 231075 Capacitor Run 522856 Motor 2 2 522324 Motor Drive 3 PH 60 HZ Internal Overload 2 2 522851 Motor Drive 1 PH 50 Hz w Capa...

Page 40: ...44 Blade Fan 285073 Condensing Unit Cab 1 1 230667 Capacitor Start 285073 Condensing Unit Cab 1 1 231101 Cap Tube Only Mix Line Cab 1 1 231108 Cap Tube Only Cab 1 1 284049 Condenser 285073 Condensing...

Page 41: ...IEW 762412 231101 230654 DR 0010 762978 231108 202235 743654 718539 357102 375813 458009 295112 718794 342008 762412 231101 230654 DR 0010 762978 231108 202235 743654 718539 357102 375813 458009 29528...

Page 42: ...18539 Switch Toggle Transformer Voltage Selector 1 1 718686 Switch Pressure High Pressure Cutout Cab 1 1 718794 Switch High Pressure Cutout 2 2 743654 Transformer Booster 1 1 762412 Valve Expansion Sp...

Page 43: ...1177606 Check Valve Kit Air Compressor Reed Valve 1 1 Needle Valve Valve Guide O Rings Spring Cab 2157903 O Ring Small Parts Kit 1 1 2177072 Extension Spigot 1 5 0 88 Opening 1 1 2177073 Extension Sp...

Page 44: ...Service Manual 513721 38 U421 I2A U431 I2A Model Machines...

Page 45: ...Machines SECTION 6 REFRIGERATION DIAGRAM AND WIRING DIAGRAMS 6 1 REFRIGERATION DIAGRAMS Cabinet Refrigeration System Remote Air Cooled Refrigeration System One Side Shown 0 1 2 3 1 1 Water Cooled Ref...

Page 46: ...Service Manual 513721 40 U421 I2A U431 I2A Model Machines U421 48I2A 6 2 WIRING DIAGRAMS...

Page 47: ...Service Manual 513721 41 U421 I2A U431 I2A Model Machines U421 409I2A...

Page 48: ...Service Manual 513721 42 U421 I2A U431 I2A Model Machines U421 109I2A...

Page 49: ...Service Manual 513721 43 U421 I2A U431 I2A Model Machines U431 48I2A...

Page 50: ...Service Manual 513721 44 U421 I2A U431 I2A Model Machines U431 38I2A...

Page 51: ...Service Manual 513721 45 U421 I2A U431 I2A Model Machines U431 18I2A...

Page 52: ...Service Manual 513721 46 U421 I2A U431 I2A Model Machines U431 409I2A...

Page 53: ...Service Manual 513721 47 U421 I2A U431 I2A Model Machines U431 309I2A...

Page 54: ...Service Manual 513721 48 U421 I2A U431 I2A Model Machines U431 109I2A...

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