QT14 Service Manual
Contents
1. HOLMAN 90 INDUSTRIAL PARK ROAD _ P O BOX 880 SACO MAINE 04072 0880 207 282 1589 800 225 3958 FAX 207 282 6283 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 FOR SERVICE INFORMATION U S AND CANADA CALL TOLL FREE 1 800 225 3958 TABLE OF CONTENTS TROUBLESHOOTING GUIDE PAGE 1 2 3 4 MAINTENANCE PROCEDURES PAGE 4 5 6 7 PARTS LIST PAGE 9 ANACON PIC TESTING PAGE 11 DRIVE CHAIN ALIGNMENT PAGE 12 DRAWINGS HEAT LIMIT SWITCH AND FUSE PAGE 1 HEAT LIMIT SWITCH HEAT REFLECTOR CRUMB TRAYS PAGE 2 DRIVE SYSTEM PAGE 3 HEATER TUBE INSTALLATION PAGE 4 FAN MOTOR INSTALLATION PAGE 5 DRIVE MOTOR INSTALLATION PAGE 6 COMPONENT ARRANGEMENT PAGE 7 MOTOR CONTROLLER PAGE 8 WIRING DIAGRAM PAGE 10 F MANUALS Completed Manuals QT14 Service Manual REV 5 282003 MJC TLC 2M HG0500 Electric Cooking Equipment for the Food Service Industry Conveyor Toasters amp Ovens Cheese Melters Broilers Pretzel Bakers PAGE 1 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 WARNING THE FOLLOWING PROCEDURES ARE TO BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN ONLY WARNING HIGH VOLTAGES ARE PRESENT IN THESE UNITS MAKE SURE ALL INPUT POWER IS OFF BEFORE INSTALLING REMOVING ANY PARTS SERVICING OR CLEANING UNIT WARNING CHECK WITH LOCAL POWER COMPANY TO DETERMINE ACTUAL VOLTAGE AT JOB SITE NOTE LUBRICATION OF DRIVE CHAIN WITH HIGH TEMP SYNTHETIC OR GRAPHITE BASED LUBRICANT IS REQUIRED AS2. 10 Replace panels and test unit for proper operation p f MAINTENANCE PROCEDURES CONT PAGE 5 PAGE 5 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 MAINTENANCE PROCEDURES CONT B REPLACING FAN MOTORS 1 DISCONNECT UNIT FROM POWER SOURCE 2 Remove panel with the fan motor that needs to be replaced 3 Unplug power supply cord from fan motor 4 Remove 4 screws that hold fan motor and grill to cover 5 Put replacement motor and grill in place and secure to the air intake cover with screws 6 Reconnect power supply cord to fan motor 7 Replace air intake panel 8 Test to make sure air is being drawn into unit AIR INTAKE COVER FAN MOTOR SECURED BY 4 SCREWS Q5 C REPLACING BELT DRIVE MOTOR 1 DISCONNECT UNIT FROM POWER SOURCE 2 Carefully lay unit on top cover DO NOT LAY UNIT ON WINDOW SIDE AS DAMAGE TO GLASS WILL OCCUR 3 Remove back panel attached to power supply utility box and bottom control box cover Drive chain and sprockets will now be visible 4 Loosen 4 screws holding motor in place Slide the motor to provide slack in drive chain Remove the drive chain Remove sprocket from motor shaft by loosening the Allen screw on the sprocket collar MAINTENANCE PROCEDURES CONT PAGE 6 PAGE 6 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 MAINTENANCE PROCEDURES CONT 5 Disconnect the drive motor leads to the internal wiring Motors are rated 208 V
3. PERIODIC MAINTENANCE CALL HOLMAN FACTORY SERVICE DEPARTMENT FOR DETAILS TROUBLESHOOTING GUIDE A UNIT WILL NOT HEAT CONVEYOR BELT WILL NOT TURN 1 Be sure main Circuit Breaker is switched to the ON position and there is power at the outlet 2 Check to see that the unit is connected to power and Master On Off is switched to the ON position 3 Be sure HEAT LIMIT SWITCH is pushed in see below 4 Check both fuses B UNIT WILL NOT HEAT CONVEYOR TURNS 1 Check to see if the Master On Off Switch is in the ON position 2 Press heat limit switch located on the exit end of the Sandwich Warmer beneath the unload tray as shown above If this reactivates the heater tubes see section C 3 Contact the Holman Cooking Equipment Factory Service Team at 1 800 225 3958 if assistance is required PAGE 2 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 TROUBLESHOOTING GUIDE CONT C HEAT LIMIT SWITCH Your Holman Conveyor Sandwich Warmer is equipped with an automatically activated HEAT LIMIT SWITCH that interrupts the heater tube connections if the air temperature in the control box exceeds 190 88 C This limit switch can be reset manually by pushing the button in the center of the switch that is located beneath the unload tray THE HEAT LIMIT SWITCH CAN BE ACTIVATED IF THERE IS NOT A PROPER AMOUNT OF AIRFLOW BEING GENERATED BY THE COOLING FANS IF THIS OCCURS 1 DISCONNECT UNIT FROM POWER SOURCE 2 Check to
4. circuitry Overview For the Speed potentiometer to function properly it needs 5V across its terminals For this the drive produces a 5V output for user connection The terminals are labeled and They are located on the lower left corner of the drive The potentiometer then uses this voltage to send a signal from 0 to 5 volts back to the drive as a speed reference Safety Great care should be taken when testing the potentiometer because of the high voltage potential There is only 5 volts from lead to lead but when referenced to ground the voltage may be much higher In fact it could be as high as the applied power to the drive The individual connection points are very close together Care should be taken not to short across them with the meter leads Reference Voltage Check A meter connected to and should read 5 If readings are otherwise try disconnecting the potentiometer and re test Speed Reference Check To check the potentiometers health connect a meter from the terminal on the drive and the sp terminal As you rotate the pot from one extreme to the other you should see a smooth transition from 0 to 5 Volts DC or 5 to 0 Volts DC PAGE 12 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 BEARING WASHER g SPACER Drive Chain Alignment Note that during factory assembly a 1 8 side to side play is adjusted into the driveshaft to allow for chassis expa
5. see if air intake fans in the front of the unit are free of dust grease or other obstructions 3 Check to see if crumb trays heat reflectors are in place T NEVER OPERATE UNIT WITHOUT CRUMB TRAYS IN POSITION AS THIS CAUSES OVERHEATING IN THE CONTROL BOX TROUBLESHOOTING GUIDE CONT ON PAGE 3 PAGE 3 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 TROUBLESHOOTING GUIDE CONT D CONVEYOR WILL NOT TURN UNIT HEATS PROPERLY 1 DISCONNECT UNIT FROM POWER SOURCE 2 Check both 10505 3 Check to see if there are obstructions in the conveyor system that may cause a jam 4 If there are no obstructions found manually move the conveyor belt to check for mechanical binding If conveyor does not move freely call the Holman Cooking Equipment Factory Service Team at 1 800 225 3958 as drive motor and or variable speed control unit may have to be replaced refer to page 5 for instructions on replacing drive motor IF CONVEYOR STILL DOES NOT TURN 5 If conveyor turns freely remove power supply panel and check for loose sprockets Realign any loose sprocket s and tighten allen screw 6 Contact the Holman Cooking Equipment Factory Service Team at 1 800 225 3958 if assistance is required DRIVEN SPROCKET DRIVE CHAIN DRIVE SPROCKET TROUBLESHOOTING GUIDE CONT ON PAGE 4 PAGE 4 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 TROUBLESHOOTING GUIDE CONT E CONVEYOR TURNS AT ONE SPEED REGAR
6. 08V 6 GE 198081 HEATER TUBE QUARTZ TOP 240V 10 GE 198080 HEATER TUBE QUARTZ BOTTOM 240V 6 GE 198083 HEATER TUBE QUARTZ TOP 220V 10 GE 198082 HEATER TUBE QUARTZ BOTTOM 220V 6 PARTS LIST DESCRIPTION Qty PART DESCRIPTION Small Heater Tube Retainer 4 2E 200574 Fan Switch Large Heater Tube Retainer 1 2U 200577 Fan Motor Conveyor Belt 1 2R 200562 Grill Fan Motor Quick Clip Belt Links 3 2R 200721 Fan Blade 3 Bushing Spring loaded 2 2E 200535 Contactor Relay 40 amp Spring 2 2U 200579 Motor Controller Drive Shaft 1 2J 200427 Pilot Light Idler Shaft 1 GE 118064 Speed Control Center Idler Shaft 1 2E 200552 Rocker Switch Shaft Bushing 4 2R 200761 Control Knob Drive Motor right to left 1 2Q 200588 Window Drive Motor left to right 1 GE 101029 Crumb Tray Drive Chain 1 GE 100944 Unload Tray Driven Sprocket 1 GE 402654 Lower Crumb Tray Drive Sprocket 1 2R 200715 Leg 4 Metal Reset Switch PAGE 9 Qty N N k PAGE 10 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 WIRE DIAGRAM 1 loe TOP HEATERS 1 25550 rie e 2 9 e ST o jeje i ra ree 2 5 ENE VAN WINDOW SIDE CONTROL SIDE 135646 G 135653 LE O PAGE 11 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 Anacon Potentiometer Input Circuit Testing This check can be performed to verify the health of the analog input
7. DLESS OF SPEED CONTROL SETTING 1 Contact the Holman Cooking Equipment Factory Service Team at 1 800 225 3958 as variable speed control unit may have to be replaced F COOLING FANS DO NOT START 1 DISCONNECT UNIT FROM POWER SOURCE 2 Remove panels with fan motors and check fan blades for obstructions 3 Check fan motor cords for secure connection 4 Call Holman Factory Service Team as the fan switches and or fan motor s may have to be replaced MAINTENANCE PROCEDURES A REPLACING HEATER TUBES see below 1 DISCONNECT UNIT FROM POWER SOURCE 2 Carefully remove window in the back of the unit See Operations Manual for detailed instructions to remove window 3 Remove front control panel and back panels by removing the Philips head screws in each panel Pull the top of each panel out slightly and lift up 4 Locate defective heater tube and disconnect heater tube wires that require replacement from terminal block connections 5 Loosen screws holding the heater tube retainer in place Slide the retainer up to allow the heater tube to be removed and tighten screws holding retainer 6 GENTLY pull defective heater tube out of unit 7 GENTLY place new heater tube into unit 8 Once new heater tube is installed loosen retainer screw slide retainer back into original position and tighten Make sure the ends of the quartz heater tubes are free to move slightly 9 Reconnect heater tube wires to terminal block connections
8. n the top center of the control box 5 Wires from variable speed control go in to terminals located on the controller Note the location of the colored leads and remove wires for variable speed control refer to diagram on page 8 for wire locations 6 Disconnect the wires from terminals marked L N M1 and M2 note which wires go to each terminal 7 Remove Philips head screws 4ea holding controller in place 8 Mount replacement control in the same manner as the old control 9 Reconnect wires removed from old control refer to diagram on page 8 for wire locations 10 Replace control box cover place unit on legs and connect to power supply Test for proper operation 11 Call the Holman Factory Service Team at 800 225 3958 if assistance is required COMPONENT ARRANGEMENT 1 Contactor Relay 2 Heat Limit Switch 3 Drive Motor 4 Terminal Strip 5 Motor Control SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 CONTROLER FOR DRIVE SYSTEM M1 M2 MOTOR CONTROLLER BLACK S SPEED CONTROL POTENTIOMETER PAGE 8 PART No GE 402651 GE 402359 GD 160008 2B 200626 2P 200785 2P 200766 GD 100924 GE 100909 GE 100716 GB 112262 2U 200509 2U 200504 2 150008 2P 115362 2P 200648 2E 200566 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 HEATER TUBE PART LIST PART No DESCRIPTION QTY GE 198078 HEATER TUBE QUARTZ TOP 208V 10 GE 198077 HEATER TUBE QUARTZ BOTTOM 2
9. nsion Unit must be cool Do NOT adjust position of the sprocket on the drive shaft Insert 1 16 spacer i e a drill bit between driveshaft sprocket and adjacent washer Push the sprocket against the 1 16 spacer which results in the sprocket snug against the spacer spacer against the washer and washer against the bearing assembly Measure dimension A the distance from the chassis to the center of the sprocket Adjust the sprocket on the drive motor so that dimension B the distance from the chassis to the center of the motor sprocket is equal to dimension 1 16
10. olts or 240 Volts note which color leads are being used for these connections and which lead is capped with white tape The new drive motor should use the same arrangement 6 Remove the four screws that hold the drive motor in place and remove drive motor DRIVEN SPROCKET DRIVE CHAIN DRIVE SPROCKET 7 Put the new motor in place and loosely attach with the four screws removed from step 5 8 Replace the sprocket onto the motor shaft and then replace the drive chain onto the sprockets 9 Slide the drive motor until the drive chain has about 1 8 slack when lightly pushed at the center of its top open run Tighten the drive motor screws Align drive and driven sprockets evenly before tightening to prevent binding Secure by tightening Allen screw on sprocket collar 10 Rewire the drive motor as described in step 4 above Replace the panels and test for proper operation DRIVE SPROCKET WITH SET SCREW CUT AWAY VIEW OF DRIVE MOTOR IN CONTROL BOX DRIVE MOTOR MOUNTING SCREW MAINTENANCE PROCEDURES CONT PAGE 7 PAGE 7 SERVICE MANUAL HOLMAN CONVEYOR SANDWICH WARMER MODEL QT14 MAINTENANCE PROCEDURES CONT D REPLACING THE VARIABLE SPEED MOTOR CONTROLLER see below 1 DISCONNECT UNIT FROM POWER SOURCE 2 Carefully lay unit on top cover DO NOT LAY UNIT ON WINDOW SIDE AS DAMAGE TO GLASS WILL OCCUR 3 Remove Philips head screws holding control box cover in place 4 Locate the motor controller mounted i
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