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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.com
MHCservmanual REV: B
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SPECIFICATIONS TOP VIEW FRONT VIEW SIDE VIEW Net Wt. Model # Voltage Amps Watts Hz. Plug lbs./kg 86002 120 10.4 1250 60 30/14 6’ Nema 5-15P 2 Holding Cabinet – Service Manual
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MHC-22-GEN CONTROL PANEL MODEL 86002 Bin Button #1 Bin Button #2 Up Arrow Button Program Button Down Arrow Button Time Button Temperature Button Bin Button #3 Bin Button #4 Holding Cabinet – Service Manual 3
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WIRING DIAGRAM 4 Holding Cabinet – Service Manual
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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
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TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE CAUSE EVALUATION Holding Cabinet will Incoming Power Supply Verify power cord is secured firmly in receptacle. not heat Measure the incoming voltage. Check circuit breakers. Reset if required. Call power company if needed. Power Switch Check continuity between switch terminals. Replace switch as needed. Unit doesn’t reach Thermocouple Check for continuity in circuit. desired temperature Heat Element Compare cavity temperature with di
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TROUBLESHOOTING GUIDE (CONT’D) Display reads Make sure wires are connected properly unusual characters (grounded). If wires are grounded properly, new control board is needed. On/Off switch doesn’t Power Switch Check wiring to switch. light (but unit works properly) HEAT SHELF – REPLACEMENT 1. Disconnect power. 2. Take out screws holding “L Brackets” in cavity. 3. Disconnect thermocouple and all power connections to board. Mark all wires for reassembly. 4.
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PARTS BREAKDOWN LABEL PART NUMBER PART DESCRIPTION A 340040 Back Panel Assembly B 340041 Side Panel C 340042 Power Board Assembly D 340043 Controller, User Interface E 340038 Switch, Rocker, Lighted F 10000949 Overlay, Control Panel G 340045 Bracket, Heater Side H 340046 Tray Seal I 340011 Leg J 340015 Tray, Plastic K 340025 Tray Cover, Front Retention Rod, Assembly L 10000968 Side Insulation M 340048 Top / Bottom Insulation N 10000966 Heater Insulation O 10000946-02 Lo
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GENERAL VIEW Holding Cabinet – Service Manual 9
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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. The thermocouple calibratio
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► 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. ErNN UPPER HEATER ZONE LOWER HEATER ZONE Some Examples: Er01 Indicate
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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.com 12 Holding Cabinet – Service Manual
