Sub-Zero Wolf 506UI Service Manual
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Sub-Zero Wolf 506UI Service Manual

Sub-Zero Wolf 506UI Service Manual

Undercounter icemaker
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General Information
Installation Information
Controls & Operation
Component Access & Removal
Troubleshooting Guide
Technical Data
Wiring Diagrams
506UI
Service Manual
subzero.com
800.222.7820
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27
40
44
47
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Summary of Contents for Sub-Zero Wolf 506UI

  • Page 1 subzero.com 800.222.7820 506UI Service Manual General Information Installation Information Controls & Operation Component Access & Removal Troubleshooting Guide Technical Data Wiring Diagrams...

  • Page 2: General Information

    This Sub-Zero Technical Service and Parts Manual (Job Aid Part #3752200) for the Model 506 Undercounter Icemaker is a compilation of information provided by the Whirlpool Company and has been reprinted by Sub-Zero Freezer Company, Inc., with the permission of the Whirlpool Company. This manual will provide the most recent service information about the Model 506 Undercounter Icemaker.

  • Page 3: Warranty Information

    TEM warranty, sealed system **parts only. Warranty Notes: ONE & FIVE YEAR Non-Residential Warranty • Sub-Zero Freezer Company, Inc. assumes no liability Summary (Example: Office, Yacht, etc.) or responsibility for Sub-Zero products that have been • One Year TOTAL PRODUCT warranty, *parts and altered in any way, including the use of parts and/or labor.

  • Page 4: Installation And Maintenance

    Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Pre-Installation Considerations ELECTRIC SHOCK HAZARD Location IMPROPER CONNECTION OF THE EQUIPMENT The unit may be closed in on the top, rear and both GROUNDING CONDUCTOR CAN RESULT IN A sides, but the front must be unobstructed for air circula- RISK OF ELECTRICAL SHOCK.
  • Page 5 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Water Connection Requirements Installation of Line Tapping Device and/or Shut-off Valve Materials needed for installation: 1. Select the point on an active cold water supply line 1/4-in. O.D. copper tubing convenient to the unit where connection is to be 1/4-in.
  • Page 6 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Drain Connection Requirements RIGHT END VIEW The ice maker has a gravity drain. The ideal installation 23-7/8” 3/4” has a standpipe (1-1/4-in. minimum) installed directly below the outlet of the drain tube. (See Figure 2-3 and Figure 2-4) Water Inlet...
  • Page 7 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) How It Works (Continued) Up & Out to When the pump is in harvest cycle, the electric circuit Drain bypasses the pump pressure switch, and the pump runs continuously.
  • Page 8 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Installing the Unit Screws 1. Lay carton on its rear face and break open the bot- tom flaps. 2. Set the carton upright with all four flaps outward. To avoid damage to the finished floor when the unit is installed, or if the unit needs to be removed for service purposes, the finished floor should be pro-...
  • Page 9 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) 13. Local sanitation codes may require that the ice Screws maker cabinet is sealed to the floor with an approved caulking compound. Handle If the ice maker is installed in restaurant, local codes may require that the unit be installed up off Screw the floor.
  • Page 10 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Thermostat Calibrations If the ice maker is installed in a location over 2000 feet above sea level, the bin and evaporator thermostats must be adjusted to compensate for the altitude. On the control panel, under the escutcheon, on some models of ice makers, there will be access holes to the altitude adjustment control for each thermostat;...
  • Page 11 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Normal Consumer Maintenance The minerals rejected from the circulating water during CLEAN Disconnect Harness the ice-making cycle may eventually form a hard scaly deposit in the water system, inhibiting the release of the ice slab from the evaporator.
  • Page 12 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Using a Commercially Prepared Cleaning Solution 11. Clean the scale off the side flanges of the evapora- tor freezing plate with a plastic scrubber dipped into Commercially prepared liquid ice machine cleaning the prepared cleaning solution.
  • Page 13 Installation & Maintenance Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Condenser Cleaning It is necessary to periodically clean the air-cooled con- denser to ensure efficient operation of the ice maker. To clean the condenser: 1. Make sure the power is disrupted to the ice maker. 2.

  • Page 14: Theory Of Operation

    Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) OPERATING SYSTEMS • Suction Line: The cool gas travels through the suc- tion line which is also partially wrapped with the capil- There are three operating systems in the icemaker: lary tube.
  • Page 15 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Refrigeration Flow - Ice Making Cycle During the later stages of the ICE MAKING cycle, as the ice slab forms on the evaporator freezing plate, In the refrigeration system, (See Figure 3-2) the hot some of the refrigerant passing through the evaporator...
  • Page 16 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Refrigeration Flow - Harvest Cycle In the refrigeration system, (See Figure 3-3) the hot gas valve opens, allowing high pressure refrigerant gas to bypass the condenser and flow through the condenser accumulating tube. The hot gas pushes the liquid refrigerant that has accumulated in the accumulator tube up into the evaporator.

  • Page 17: Water System

    Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Water System Evaporator Distributor Freezing Plate The water system provides fresh water necessary for ice production, recycling this water as ice is produced. The water system also flushes away rejected minerals and contaminants, circulates cleaning solution during the CLEAN CYCLE, and provides a means of drainage.
  • Page 18 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Harvest Cycle The ice slab, when released, slides off of the evaporator plate onto the cutting grid, where it begins to be divided into individual cubes that fall into the bin. (See Figure 3-7 and Figure 3-8) In the water system, the water valve opens allowing water to flow into the water reservoir pan.

  • Page 19: Electrical System

    Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Electrical System The units electrical system provides power for the refrigeration and water systems to operate, and controls the operational cycling of the ice maker. 60 HERTZ VOLTS CLEAN WATER...

  • Page 20: Operational Cycles

    Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Operational Cycles 60 HERTZ VOLTS There are three operational cycles of the ice maker: 1. ICE MAKING cycle CLEAN WATER PUMP 2. HARVEST cycle SERVICE SWITCH 3. CLEAN cycle CONDENSER RECEPTACLE In addition, there are two operational OFF cycles of the...
  • Page 21 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) HARVEST Cycle 60 HERTZ VOLTS When the set temperature of the evaporator thermostat is reached, the evaporator thermostat terminates power to the fan and water pump, and supplies power to the CLEAN WATER PUMP...
  • Page 22 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) OFF Cycle when the bin is full of ice and the service 60 HERTZ VOLTS control switch is in the “ON” position In the electrical system, when the bin thermostat sens- es the bin is full of ice, power is cut off to all of the elec- CLEAN WATER...
  • Page 23 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) OFF Cycle when the service control switch is in the 60 HERTZ VOLTS “OFF” position but power is still supplied to unit. On units with an FSP condensate pump installed, power will continue to be supplied to the condensate CLEAN WATER...
  • Page 24 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) On units with an FSP condensate pump installed, 60 HERTZ VOLTS power will be supplied to the condensate pump through the receptacle. The pump will operate when needed through a pressure switch in the pump itself.
  • Page 25 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) WHAT’S IN WATER INGREDIENT EFFECT CORRECTION A. IT AFFECTS ICE QUALITY Algae or Sulfides Objectionable Taste and Odor Carbon Filter Minerals: Cloudy Ice 1. Check: Sodium Slow Cutting a.
  • Page 26 Theory of Operation Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) WHAT’S IN WATER C. WATER TESTING Water testing is necessary to determine the amount of minerals in a water supply that affect ice and the ice maker. T.D.S.
  • Page 27 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) COMPONENT ACCESS AND REMOVAL This section explains how to access and remove components in a Model 506 undercounter ice maker. This section is arranged as follows: Exterior components; followed by the internal components; followed by com- pressor area components.
  • Page 28 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Control Panel The service control switch, evaporator thermostat con- trol, bin thermostat control, and the transformer are located behind the control panel. They are all secured to the control panel with screws that pass through the front of the control panel.
  • Page 29 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Evaporator Thermostat Terminal 1 Terminal 3 The evaporator thermostat is adjustable for altitude cor- rection. In the warm position, the thermostat cuts in at 38°F ± 2° and cuts out at 10.5°F ± 4°. In the cold posi- tion, the thermostat cuts in at 38°F±...
  • Page 30 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Bin Thermostat To Well in Liner The bin thermostat operates automatically and is adjustable for altitude correction. The bin thermostat cuts in at 41°F R1.5, and cuts out at 35°F R1.5. The control capillary bulb thermostat is located in a well on the left side of the bin liner.
  • Page 31 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Bin Area Components CLEAN Bin Door To remove the bin door: 1. Open the door and snap out the ice retainer by flex- ing it and slipping it off the retaining studs. (See Figure 4-8) Ice Retainer...
  • Page 32 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Cutter Grid (Continued) To remove and check: CLEAN Electrical Harness Before removing the grid, while the unit is operating, feel the grid wires. They should feel warm to the touch. 1.
  • Page 33 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Water Pump The water pump is mounted on a bracket on the back of the bin and sits in the water pan. The water pump is Motor supplied with an internal overload protector and rotates at 3350 RPM.
  • Page 34 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Evaporator The evaporator freezing plate is located directly behind ALL AUTHORIZED SERVICERS MUST UTILIZE A the cutter grid assembly. CFC RECOVERY AND HANDLING PROGRAM THAT MEETS ALL THE REQUIREMENTS OF The evaporator thermostat capillary bulb is attached LOCAL, STATE AND FEDERAL LAWS AND REGU- to the underneath side of the evaporator plate.
  • Page 35 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Distributor The water distributor is a 5/8” diameter molded plastic tube with small holes, and rubber caps in each end. It distributes water evenly over the entire evapora- tor plate surface.
  • Page 36 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Components in Unit Compartment Accessing the Unit Compartment The water inlet valve, the hot gas valve, the compressor (and starting relay and overload protectors), the con- denser, the condenser accumulating tube, the condens- er fan and drier are located in the unit compartment.
  • Page 37 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Condenser Fan The condenser fan has a 3-watt motor that turns the fan Condenser Fan blade at 1200 RPM. When facing the motor shaft, the fan blade will turn counterclockwise. To check or remove the condenser fan, the unit compartment will need to be pulled out of the unit.
  • Page 38 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Compressor and Starting Components Starting Relay Starting Relay The starting relay is a magnetic current type that plugs directly onto the compressor terminals. The unit com- partment will need to be pulled out to access the com- pressor and the starting components.
  • Page 39 Component Access & Removal Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Condenser Condenser The condenser is attached to the base assembly with screws that pass through the condenser base then are secured to the unit area base. The condenser fan shroud is attached to the back of the condenser with screws passing through the shroud into the rear side flanges of the condenser.

  • Page 40: Troubleshooting Guide

    Troubleshooting Guide Model 506(UC Ice Maker) Model 506(UC Ice Maker) TROUBLESHOOTING GUIDE This section of the manual contains the Troubleshooting Guide which will help the Service Technician troubleshoot a model 506 undercounter icemaker . How to Use the Troubleshooting Guide The list below indicates how the Troubleshooting Guide is arranged.

  • Page 41: Test / Action

    Troubleshooting Guide Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) PROBLEM POSSIBLE CAUSE TEST / ACTION 1. Unit located in cold area. 1. Move to warmer area (above 55° F.) Compressor won't run; No 2. Power disconnected. 2. Connect water. ice in bin.
  • Page 42 Troubleshooting Guide Model 506(UC Ice Maker) Model 506(UC Ice Maker) PROBLEM POSSIBLE CAUSE TEST / ACTION H. Ice cubes too thick. 1. Evaporator thermostat set at or beyond 1. Turn ice thickness control knob counter-clock maximum thickness. wise until desired thickness is obtained. 2.
  • Page 43 Troubleshooting Guide Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) PROBLEM POSSIBLE CAUSE TEST / ACTION O. Unit not making ice, com- 1. Evaporator freezing plate not getting 1. Repair sealed system. pressor running, and water cold. 2. Repair or replace solenoid. flow over evaporator 2.

  • Page 44: Technical Data

    Technical Data Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Model 506 Undercounter Icemaker (Prior to Serial # 1181341) Water Solenoid Valve - .25 GPM Flow Washer - 80 Mesh Inlet Screen Water Pump Motor - 39 Watts, .75 Amps, 3350 RPS - Internal Overload (Water distributor uses restricted inlet to obtain proper pump capacity) Compressor Overload - Current and Ambient Sensitive...
  • Page 45 Technical Data Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) (Starting with Serial # 1181341) Model 506 Undercounter Icemaker Water Solenoid Valve - .25 GPM Flow Washer - 80 Mesh Inlet Screen Water Pump Motor - 39 Watts, .75 Amps, 3350 RPS - Internal Overload (Water distributor uses restricted inlet to obtain proper pump capacity) Compressor Overload - Current and Ambient Sensitive...
  • Page 46 Technical Data Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) PRODUCT SPECIFICATIONS - MODEL 506 UNDERCOUNTER ICE MAKER Height 34-13/32” Width 17-7/8” Depth 23-7/8” Shipping Weight 122 Lbs. Net Weight 114 Lbs. Average Ice Making Capacity in 24 50 Lbs.

  • Page 47: Wiring Diagrams/Schematics

    Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) UNIT WIRING DIAGRAM & SCHEMATIC PRIOR TO 1995 (Prior to Serial #1140060) 60 HERTZ VOLTS CLEAN WATER PUMP SERVICE SWITCH PLUG CONDENSER RECEPTACLE N.C. THERMO- SOLENOID STAT N.C. WATER PRESSURE SHUNT...
  • Page 48 Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) UNIT WIRING DIAGRAM & SCHEMATIC BEGINNING 1995 (Starting with Serial #1140060) COLOR CHART 60 HERTZ 115 VOLTS BLACK BLUE WATER PUMP WHITE YELLOW CLEAN ORANGE BLACK / WHITE TRACER CONDENSER BK/W SERVICE...
  • Page 49 Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Linear Strip Circuits Water Pump ( ICE MAKING Cycle) Evaporator Thermostat Service Switch Water Thermostat Pump Water Pump ( CLEAN Cycle) Service Switch Water Pump Condenser Fan Evaporator Thermostat Service Switch...
  • Page 50 Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Linear Strip Circuits Hot Gas Valve Solenoid (Units with gravity drain or non-FSP pump - Shunt in receptacle) Receptacle Evaporator Thermostat Hot Gas Solenoid Thermostat Shunt Hot Gas Valve Solenoid (Units with FSP condensate drain) Receptacle Evaporator Thermostat...
  • Page 51 Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Linear Strip Circuits Water Valve Solenoid (Units with FSP condensate drain) Receptacle Evaporator Thermostat Water Valve Solenoid Service Switch Thermostat Pressure Switch Condensate Drain Pump Compressor (Start) Overload Service Thermostat Switch...
  • Page 52 Wiring Diagrams/Schematics Model 506 (UC Ice Maker) Model 506 (UC Ice Maker) Linear Strip Circuits Bin Light Transformer 115V Service Switch 8.5 V Bin Light Door Switch Cutter Grid Transformer 115V Service Switch 8.5 V Cutter Grid FSP Condensate Pump (HARVEST Cycle) Receptacle Evaporator Thermostat...

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