parts and service manual merco holding cabinet model
Contents
1. P Merco Savory PARTS AND SERVICE MANUAL FOR MERCO HOLDING CABINET MODEL MHC 22 TDL Y EN 4 m AM Garland Commercial Ranges 1177 Kamato Road Mississauga Ontario LAW 1X4 Canada Facsimile 905 624 5669 Telephone 905 624 0260 HortonsServMan REV K 5 9 06 SEQUENCE OF OPERATION SPECIFICATIONS Net Wt MHC 22 TDL 1250 30 14 Nema 5 15P TESTING VALUES 1 3 Amps 4 2 to 5 0 depending on room temperature 100 120 Volts 347 mm 13 65 445 mm 17 51 TOP VIEW 495 mm 19 50 213 mm 10 76 FRONT VIEW SIDE VIEW WIRING DIAGRAM ymo 191 E NIG Baden 221 di ymo 21 a 2 NIG 91 La 53401 21 i NIG adan 991 is uo 121 a y NIB adan 801 La J18V2 NOGGIY 2 Pi Yash gf UY3y CIMA E iH eH H PH Quvog HIMOd vf 8H MP O t If Eo d 31400A83H 821 121 NIVA HOLIAS 15 4 431Y3H SH ik 0301 Nig YIddh 344 NIG YIRO1I M IM dddfi NIG u 1M01 HIMO NIE 4iddf QUO ISS WH3 NU TROUBLESHOOTING GUIDE POSSIBLE CAUSE Holding Cabinet will not heat Incoming Power Supply Verify power cord is secured firmly in receptacle Measure the incoming voltage Check circuit breakers Reset if required Call power company needed o Power Switch Check conti2. de H K 10001335 Tray Seal 1 1400089 leg 4 Jd 210000947 Tray Plastic 2 3 4 34 L 21000097 Tray Cover Front Retention Rod Assembly M 10000968 Insulation Side 1 2 N 21000099 Insulation Top Bottom O LowerSnef Assembly a 86104SP Upper Upper Shelf Assembly a 881058P Lower Upper Shelf Assembly 12 R 100094 _ Rod Rear Tray Seal Retainer 2 1000170 Shown 10001063 Power NEMA5 15P Not Shown 10001053 Cable Power Board a SHELF ASSEMBLY DIAGRAM 86104SP O 86103SP 86105SP O 86103SP GENERAL VIEW MERCO HOLDING CABINET CONTROL PANEL Bin Button Bin Button Up Arrow Button Program Button AM PM Button O Time Button Down Arrow Button Temperature Button Bin Button Bin Button On Off Button DIAGNOSTIC MODE gt 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 gt reset the holding bin c
3. ments and use a digital multimeter The element resistance should be as follows 120V 87 ohms Replace heating element shelf as needed NNNM SE See X TROUBLESHOOTING GUIDE CONT D Display reads Make sure wires are connected properly unusual characters grounded NENNEN 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 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 Take out shelf mounting screws from both sides Remove shelves and feed wiring out of unit E Dore WARNING Be careful to avoid tearing the aluminum foil while working with wire connections 7 Reassemble in reverse order USER INTERFACE U I BOARD REPLACEMENT Remove four 4 screws When replacing U I board be Disconnect thermocouples sure ribbon cable is connected Disconnect ribbon cable so that blue wire is facing Remove board towards interior of unit Reassemble in reverse order GL E PARTS BREAKDOWN LABEL PART NUMBER PART DESCRIPTION REC STOCK QUANTITY O 10000940 Back Panel Assembl 10000935 Side Panel D 861015 Controller UserInterface lt 2 F 86102SP Overlay Control Panel G 1000948 JjBraketHeatrSi
4. nuity between switch terminals Replace switch as needed doesn t reach Check for continuity in circuit temperature ii MN 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 Check page 2 for rating information If the amp draw is high or low check the individual elements for opens shorts and proper resistance WITH POWER OFF To check resistance of the elements remove all leads from the elements and use a digital multimeter The element resistance should be as follows 120V 87 ohms Heplace heating element shelf as needed BEEN thermostat common wire Please note a if thermostat is both circuits will be bad Emas o is too mo a for incorrecily wired thermocouple high Thermocouple wire polarities are reversed 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 Check page 2 for rating information If the amp draw is high or low check the individual elements for opens shorts and proper resistance WITH POWER OFF To check resistance of the elements remove all leads from the ele
5. ontroller to the factory configuration hold down the upper left Bin button while powering on the controller Release the Bin button as soon as the displays illuminate This resets the following settings AM and PM menus All product names Upper and lower temperature for each product Expiration and Cook More time for each product NOTE For additional information concerning Menu and Product programming please refer to Merco Holding Cabinet Installation amp Operation Manual WARRANTY INFORMATION COVERAGE PERIOD One 1 year paris and labor on site service from the date of installation or eighteen 18 months from the date the unit is shipped from Garland whichever comes first EXCLUSIONS Labor charges will not be paid for travel costs beyond 150 Kilometers 100 Miles and two 2 hours travel round trip other than over land holiday charges or any special arrangements requiring other than normal time Normal maintenance items such as light bulbs fuses gaskets O Rings interior amp exterior finishes lubrication demiling broken glass etc Improper or unauthorized repairs Damage in shipment Adjustments and calibrations after 90 days from installation Failure caused by erratic voltages gas supply or improper installation This page intentionally left blank P Merco Savory
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