SERVICE & TROUBLESHOOTING MANUAL FOR DISPLAY HOLD
Contents
1. Check continuity 18 Ohms Replace as needed 4 Defective Motor 4 Check coil for continuity Replace as needed Water leaking in 1 Water tank overfilled 1 Check for proper water level control area 2 Defective water line 2 Repair as needed Rack will not rotate 1 Defective proximity switch 1 Check continuity or missing magnet Replace as needed 2 Defective Display Board 2 Check connections replace as needed 3 Defective Motor 3 Replace as needed 4 Missing Roll Pin s 4 Reinstall roll pin s 5 Defective Clutch 5 Replace as needed Rack continues to rotate when door is open Defective Proximity Switch 2 Defective Board Check continuity Replace as needed 2 Replace as needed Fluorescent lights do 1 Lights burned out 1 If light flickers check grounding Replace as needed not illuminate 2 Improper socket connections 2 Check connections replace as needed 3 Defective Ballast 3 Replace as needed Light doesn t 1 Defective or Limed Floats 1 Replace as needed illuminate when tank 2 Light 2 Replace as needed is low 3 Relay 3 Check signal to coil Verify wiper trips Replace as needed No temperature display 1 Defective RTD 2 Defective Display Board 1 Check continuity see chart Replace as needed 2 Replace as needed Sign lights do not illuminate 1 Burned out bulbs 2 Improper Socket Connections 1 GEF13T5CW 18 20 Ohms across pins o2. WU Vi W AES DHC Series Service Manua PARTS LIST DHC 24 ELECTRICAL COMPONENTS 10 KEY NUMBER PART NUMBER DESCRIPTION QTY USED 2 369805 Rocker Switch 1 3 46225SP Knob 2 4 46226SP Green Pilot Light 1 5 M51052SP Red Pilot Light 1 6 46227SP Label Water Fill Hum 1 7 46228SP Panel Left Hand Top Rear 1 8 46229SP Control Panel 1 8a 46204SP Control Panel Assembly 1 9 46230SP Label Control Hum 1 10 46231SP Panel Right Hand Top Rear 1 11 46232SP Latching Relay 1 12 46233SP Temp Hum Control with Probe 1 13 46234SP Digital Display Unit 1 14 46235SP Cover Heat Hum Chamber 1 15 46236SP Water Fill Assembly 15a 46237SP Elbow 34 NPT x Slip 1 15b 46238SP Bulkhead Fitting 1 15c 46239SP Nut Bulkhead 1 15d 46240SP 90 Elbow 34 NPT Slip 1 15e 46241SP Tubing Tygon 34 ID 16 46242SP Heater Air 120V 1 17 15856SP Thermocouple Air Inlet 1 18 46243SP Hi Limit Thermostat 1 19 46244SP Water Tank 1 20 46245SP Heater Immersion 120V 1 21 46246SP Pipe Coupling 1 22 46247SP Socket Quick Connect 1 23 46248SP Plate Water Cover 1 24 46209SP Water Tank 1 25 46249SP Gearmotor 115V 2a 1 26 46250SP Water Tank Top 1 27 46251SP Switch Float Lo Limit Assembly 1 28 46252SP Switch Float Hi Limit Assembly 1 Switch Float 29 369124 Cooling Fan 1 29a 46254SP Cooling Fan Shroud 1 30 46255SP Bulkhead 1 31 46256SP Bal
3. is closed the proximity switch closes and the display board will supply 120VAC to the rack motor The display uses a RTD probe to sense and show cabinet air temperature 4 DHC Series Service Manual SCHEMATIC SHJAWNN 0 ALIGIWNH LYLSDOWAJHL EL 9 1Y1SOWHJHL 1IWIT LVLSOWHAHI TL 19073 HOLIMS 5 19073 HOLIAS ES ALIWIXDgd HOLIAS 25 G A3MDd HOLIAS AV 138 AD010W SOLOW 9 KSI 3053 0073 97 MO9 AYTdSIQ ALIGIWNH 401V0IQNI MOT H01VJIONI 1 H IW TH GT 21 AYASI 514 1SYTWA 198 AS Series Service Manual TROUBLESHOOTING GUIDE CONDITION POSSIBLE CAUSES SUGGESTED SOLUTIONS No Steam 1 water in tank 1 Check to see if water tank is filled 2 Lime mineral build up 2 Clean or replace affected parts 3 Closed Hi Limit 3 Check continuity 200 Ohms Replace as needed 4 Defective Thermostat humidity 4 Check for cycle by increasing Replace as needed 5 Defective Relay 5 Replace as needed 6 Defective Floats 6 Long float is normally open Replace as needed T Defective Element 7 Check continuity 120V 44 Ohms 10 5 230V 160 Ohms Replace as needed No Heat 1 Defective Hi Limit 1 Replace as needed 2 Defective Heating Thermostat 2 Replace as needed 3 Defective Element 3
4. cated on the left side of the control panel Using the measuring cup provided start filling the tank 3 Fill the tank until the beeping sound is heard This indicates the tank is filled to capacity Do not overfill or water will overflow from the water reservoir 4 Close water tank reservoir 5 Filling the water reservoir to capacity will allow for approximately 6 to 8 hours depending on the type of food displayed control settings frequency of door openings etc 2 DHC Series Service Manual WATER RESERVOIR FILLING INSTRUCTIONS CONT D RE FILLING 1 The red Add Water light will illuminate when additional water is required 2 IMPORTANT DO NOT add water until this light is illuminated The add water alarm will not sound unless the light is on 3 Fill the tank until the beeping sound starts CLEANING INSTRUCTIONS A CAUTION UNPLUG UNIT AND ALLOW IT TO COOL BEFORE CLEANING The DHC Display and Hold Cabinets are designed for easy cleaning Remove the interior rack and wash in hot sudsy water The interior and exterior surfaces need nothing more than a daily wiping with a soft damp cloth Do not use abrasive cleaners on any part of the unit This will cause damage to the unit This appliance shall not be cleaned with high pressure water jets WARNINGS To prevent electric shock always unplug the unit before performing cleaning maintenance or repair Plug the cabinet into a properly grounded electrical outlet o
5. ef A Merco SERVICE 8 TROUBLESHOOTING MANUAL FOR DISPLAY HOLD CABINETS DHC SERIES PIZZ REV 1 28 09 ELECTRICAL SPECIFICATIONS Description Voltage Hz Watts Amps Cord Plug Dimensions Domestic DHC 24H ARA ok 120VAC 60 1500 125 6 NEMA5 15P 24 Wx36 Hx24 D Domestic DHC 24 120 60 1175 9 8 6 NEMA 5 15 24 W x36 H x 24 D Internaitonal E PAN Ge 230 50 1500 7 2M CEE7 7 SEH International DHC 24 CE RA AE 230vac 50 1175 55 2M CEE7 7 AA OPERATION The DHC is designed to display and hold up to 4 18 pizzas for one hour Set Main Power switch to the position Pre heat the unit for 20 minutes Set the temperature control at desired temperature for your product Factory recommendations are setting 6 on the temperature dial 175 F 80 C The temperature range is 125 F 52 to 205 96 The red Add Water light will start blinking when water is needed Fill the water tank with distilled water in preparation to start the humidity cycle The water tank will hold 1 gallon 3 75 liters of water Be careful not to overfill If the tank is overfilled water will exit back out of the fill cup An audible alarm will sound prior to overfilling of the tank If the alarm is heard the operator is to cease filling the water tank Set humidity Factory recommendat
6. f the correct voltage size and plug configuration If the plug and receptacle do not match contact a qualified electrician to determine proper voltage and size and install the proper electrical outlet Do not attempt to clean the water tank system with chemical agents Only use GE F13T5CW Teflon coated fluorescent bulbs or equivalent for replacement CAUTIONS Some exterior surfaces on the Display Cabinet will get hot Use caution when touching these areas to avoid injury The unit must be transported in an upright position If transported on its side all glass surfaces must be secured with tape and the water must be drained Never use anything but water in the tank system DHC Series Service Manual SEQUENCE OF OPERATIONS 24 120VAC Single Phase Power is permanently supplied to the normally open on off switch Closing the on off switch supplies 120VAC to the display fan motor and two 60 Watt back lights through the normally closed hi limit to the normally open heating thermostat Power is also supplied to the relay float switches located in the water tank and the fluorescent lights The relay supplies 120VAC to the normally open humidity thermostat When the humidity thermostat closes 120VAC is supplied to the water heating element and to the humidity indicator light When the float switch detects a low water condition the relay switches power from the humidity thermostat to the low water indicator light When the door
7. ions are setting to medium Open the access door s and load the product onto the shelves of the rotating rack The rack will stop rotating when the door s are opened The DHC will keep your product hot and fresh for serving The digital display will monitor the cabinet temperature The alarm will sound when the tank needs to be refilled CONTROL PANEL FEATURES Main Power On Off Switch This switch controls power to the unit Temperature Display Shows cabinet temperature in F or C Heat Control This control regulates the cabinet temperature The settings range from low to high Humidity Control This control regulates the amount of cabinet humidity The settings range from low to high Heat On Light This green light illuminates when the heat control is energized Add Water Light This red light illuminates when additional water is required CHANGING MERCHANDISING DISPLAY PANELS The merchandising panels supplied by Merco Savory are easily changed by removing the four 4 mounting screws located on the top and back side of the unit 2 on each side WATER RESERVOIR FILLING INSTRUCTIONS INITIAL FILLING IMPORTANT To prevent excess mineral build up which could affect the operation of this unit only use low mineral or distilled water Service required due to excessive mineral build up WILL NOT be covered under warranty 1 Set main power switch to the ON position Open the water reservoir cover lo
8. last 1 32 000678SP Lamp Socket 1 33 000370SP Light Bulbs 1 DHC Series Service Manual EXPLODED VIEW ILLUSTRATION DHC 24 ELECTRICAL COMPONENTS DHC Series Service Manual Merco Merco Savory LLC 1111 North Hadley Road Fort Wayne Indiana 46804 United States of America Telephone 260 459 8200 U S Fax 888 790 8193 Fax 260 436 0735 Service Hotline 800 678 9511 www mercosavory com ai E ST AR STAR SERVICE AND PARTS
9. n same end Replace bulbs as needed 2 Check connections replace as needed Water inside cabinet Defective Drain Valve 2 Humidity too high Replace as needed 2 Turn down humidity DHC Series Service Manual This page intentionally left blank DHC Series Service Manual PARTS LIST DHC 24 CABINET KEY NUMBER PART NUMBER DESCRIPTION QTY USED 1 Trim 2 2 Slide Glass L 8 2 3 46206SP Rear Door Assembly 24 Cabinet 1 Door Hinge Part of Door Assembly 3 Rear Door Glass 1 Rear Seal Door Stop 1 Door Handle Assembly 1 4 Power Cord 1 5 Top Cover 1 6 46201SP Light Assembly Complete 2 4 40 x 4 Pan Screw 4 46214SP Fluorescent Bulb Fi3T5 1 46215SP T5 Lampholder 2 7 46301SP Pizza Rack 24 1 7A 46305SP Pretzel Rack 24 1 7B 46306SP Sandwich Rack 24 1 8 46257SP Trim 1 9 46258SP Clutch 1 10 46259SP Cotter Pin 1 11 46314SP Sign Pizza 24 1 11B 46315SP Sign Pretzel 24 1 11C 46316SP Sign Sandwich 24 1 12 46218SP Front Curved Glass 1 12A 46219SP Front Door Left and Right 1 Must be purchased as set 13 46220SP Top Seal 1 14 46221SP Bottom Seal 1 15 46222SP Louver Panel Left 1 15A 46223SP Louver Panel Right 1 DHC Series Service Manual EXPLODED VIEW ILLUSTRATION DHC 24 CABINET i e
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