PARTS AND SERVICE MANUAL FOR MERCO HOLDING CABINET MODEL 86002 Merco Savory, Inc. 1111 North Hadley Road Fort Wayne, Indiana 46804 United States of America Phone: (260) 459-8200 U.S. Facsimile: (888) 790-8193 Int’l Facsimile: (260) 436-0735 Service Hotline: (800) 678-9511 www.mercosavory.
SPECIFICATIONS TOP VIEW FRONT VIEW 2 SIDE VIEW Model # Voltage Amps Watts Hz. 86002 120 10.4 1250 60 Net Wt. lbs.
MHC-22-GEN CONTROL PANEL MODEL 86002 Bin Button #1 Up Arrow Button Bin Button #2 Program Button Down Arrow Button Temperature Button Bin Button #3 Holding Cabinet – Service Manual Time Button Bin Button #4 3
WIRING DIAGRAM 4 Holding Cabinet – Service Manual
SEQUENCE OF OPERATION Power Supply Electrical power is supplied to the unit by a 3 conductor service for single phase. 120VAC Black conductor is hot. White conductor is neutral. Green and yellow conductor is ground. Power is permanently supplied to the main power switch. Heating Circuit Closing the main power switch supplies voltage to the power board and user interface. Temperature is set through the user interface which then intermittently supplies 120VAC to the heater plates.
TROUBLESHOOTING GUIDE SYMPTOM Holding Cabinet will not heat POSSIBLE CAUSE Incoming Power Supply Power Switch Unit doesn’t reach desired temperature Temperature is too high Thermocouple Check for continuity in circuit. Heat Element Compare cavity temperature with display reading. Insert temperature probe into center of cavity. Acceptable temperature variation is +/- 20° from display reading. Check for loose connection. Check the Amp draw on each element for proper load.
TROUBLESHOOTING GUIDE (CONT’D) Display reads unusual characters On/Off switch doesn’t light (but unit works properly) Make sure wires are connected properly (grounded). If wires are grounded properly, new control board is needed. Power Switch Check wiring to switch. HEAT SHELF – REPLACEMENT 1. 2. 3. 4. 5. 6. Disconnect power. Take out screws holding “L Brackets” in cavity. Disconnect thermocouple and all power connections to board. Mark all wires for reassembly. Take out power board.
PARTS BREAKDOWN 8 LABEL PART NUMBER A B C D E F G H I J K L M N O P Q R S Not Shown Not Shown Not Shown Not Shown Not Shown 340040 340041 340042 340043 340038 10000949 340045 340046 340011 340015 340025 10000968 340048 10000966 10000946-02 340051 340052 340053 000171 340054 340055 340056 340017 340014 PART DESCRIPTION Back Panel Assembly Side Panel Power Board Assembly Controller, User Interface Switch, Rocker, Lighted Overlay, Control Panel Bracket, Heater Side Tray Seal Leg Tray, Plastic Tray Cover,
GENERAL VIEW Holding Cabinet – Service Manual 9
DIAGNOSTIC MODE ► Press and hold down the “Temperature” button until you hear a short, double-beep sound. In this mode all displays indicate temperatures for either the upper or lower heaters for each bin. Pressing the “Up” and “Down” arrow buttons will select the upper and lower heaters respectively. In this mode, pressing the “Time” button will also display the PWM output power duty cycle. This is shown as a percent for the corresponding heater.
► THERMOCOUPLE FAULT DETECTION (CONT”D) If a fault is detected in any bin, the display for that bin will show “ErNN” where “NN” is a numeric error code. This two digit error code uses the first digit for the upper heater zone. If a short is detected, the digit will be a “1”, if an open is detected a “2” will be displayed. If the heater zone is operating properly, a “0” will be displayed.
Merco Savory, LLC 1111 North Hadley Road Fort Wayne, Indiana 46804 United States of America Telephone: (260) 459-8200 U.S. Facsimile: (888) 790-8193 Int’l Facsimile: (260) 436-0735 Service Hotline: (800) 678-9511 www.mercosavory.
