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DRY CHANNEL
MODELS
HDC3/HDC6
This document is prepared for trained Duke service technicians. It is not to be used by anyone not
properly qualified to perform these procedures.
This Service Manual is not all encompassing. If you have not been trained on servicing this product,
be sure to read the manual completely before attempting servicing. Be sure all necessary tools, test
equipment, and skills are available. Those procedures for which you do not have the proper skills
and test equipment must be performed only by a qualified Duke trained service technician.
This manual is Copyright © 2013 Duke Manufacturing Company. All rights reserved.
Reproduction without written permission is prohibited. Duke is a registered
Please read this manual completely before attempting
to install, operate or service this equipment
trademark of the Duke Manufacturing Company.
Duke Manufacturing Company
St. Louis, MO 63102
Phone: 314-231-1130
Toll Free: 1-800-735-3853
www.dukemfg.com
2305 N. Broadway
Fax: 314-231-5074
Service Manual
P/N 219217C
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Table of Contents
Troubleshooting
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Summary of Contents for Duke HDC3
- Page 1 Please read this manual completely before attempting to install, operate or service this equipment This document is prepared for trained Duke service technicians. It is not to be used by anyone not properly qualified to perform these procedures. This Service Manual is not all encompassing. If you have not been trained on servicing this product, be sure to read the manual completely before attempting servicing.
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Page 2: Important Safety Instructions
Service Manual for Dry Channel HDC3/HDC6 Units IMPORTANT WARNING AND SAFETY INFORMATION WARNING READ THIS MANUAL THOROUGHLY BEFORE OPERATING, INSTALLING, OR PERFORMING MAINTENANCE ON THE EQUIPMENT. WARNING FAILURE TO FOLLOW INSTRUCTIONS IN THIS MANUAL CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. -
Page 3: Table Of Contents
Service Manual for Dry Channel HDC3/HDC6 Units TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS ................2 INTRODUCTION .......................4 GENERAL ........................4 MODEL DESIGNATIONS ....................5 MAIN FEATURES ......................6 RELAY BOX .........................6 CONTROL DISPLAY ....................6 COMPONENT REPLACEMENT ..................7 TOOLS REQUIRED.....................7 CONTROL DISPLAY ....................7 CONTROL BOARD OR MYLAR COVER ..............7 RELAY BOX .........................8... -
Page 4: Introduction
Service Manual for Dry Channel HDC3/HDC6 Units INTRODUCTION GENERAL Figure 2. Channels and Zones The Duke HDC3 Dry Channel unit maintains the factory set point temperature on 3 channels (front, Channel 3 back, and center). The Duke HDC6 Dry Channel Channel 2 Zones 3A &... -
Page 5: Model Designations
Service Manual for Dry Channel HDC3/HDC6 Units MODEL DESIGNATIONS The following chart lists the different model designations and provides information on the weight and electrical requirements. TABLE 1. MODEL SPECIFICATIONS MODEL NO. SHIPPING WT. ELECTRICAL SPECIFICATIONS HDC3-37.5-208 160 lbs (59.7 kg) 208VAC, 10.1A, 2100W, 50/60Hz... -
Page 6: Main Features
Service Manual for Dry Channel HDC3/HDC6 Units MAIN FEATURES RELAY BOX CONTROL DISPLAY DISPLAY DISPLAY HEAT ON READY On/O Main Power On/Off Switch Figure 4. Relay Box The Main Power On/Off Switch is located on Function Control Select the lower right side of the Relay Box. This is a... -
Page 7: Component Replacement
Service Manual for Dry Channel HDC3/HDC6 Units COMPONENT REPLACEMENT 4. If the Control Display is to be completely removed, tag and disconnect the wires. WARNING: 5. Remove Control Display. BEFORE ANY REPLACEMENT 6. Reverse the procedure to install Control PROCEDURE BEGINS, THE HDC3/ Display. -
Page 8: Relay Box
Service Manual for Dry Channel HDC3/HDC6 Units 3. Remove the Control Board nuts from the four 2. Remove the Dry Channel unit from its studs. power source. Use proper Lockout/Tagout procedures. 4. Reverse the procedure to install a new Control Board or Mylar Cover. -
Page 9: Solid State Relays
Service Manual for Dry Channel HDC3/HDC6 Units Main Power On/Off Switch 3. Remove the two screws that attach the SSR to the board and remove the faulty SSR. 1. Remove the four screws securing the Relay Box cover. Set the cover aside for reuse. -
Page 10: Channel Assembly
Service Manual for Dry Channel HDC3/HDC6 Units CHANNEL ASSEMBLY A heating zone consists of a Heater Element, Center Channel Hi-Limit Thermostat and an RTD. These End Channels components are embedded in a foil wrap that is attached to the bottom of each Channel Assembly. -
Page 11: Testing And Troubleshooting
Service Manual for Dry Channel HDC3/HDC6 Units TESTING AND TROUBLESHOOTING COMPONENT TESTING Fault Conditions Fault conditions are indicated on the Control Most component testing can be performed using Display. a Digital Multimeter. 1. High Temperature Fault – For a High NOTE: When a continuity test is being performed, Temperature Fault the display will show “HIX”,... -
Page 12: 24 Volt Step-Down Transformer
Service Manual for Dry Channel HDC3/HDC6 Units 24 Volt Step-Down Transformer 6. If correct voltage is present at primary, measure The 24 Volt Step-Down Transformer (Transformer) the secondary voltage. is located in the Relay Box. 7. If the secondary voltage is near 24 VAC, Transformer is operating properly. -
Page 13: Rtd
Service Manual for Dry Channel HDC3/HDC6 Units 2. Connect an ohmmeter across the RTD leads and verify that the resistance is approximately Check the RTD Thermocouple by measuring 1000Ω at ambient room temperature. the resistance between the two lead wires. -
Page 14: Sequence Of Operation
Service Manual for Dry Channel HDC3/HDC6 Units SEQUENCE OF OPERATION 7. When the heat reaches the set point 1. Plug HDC3/HDC6 unit into the proper line temperature (normally set at 275°F), the SSR source per the dataplate on the unit. -
Page 15: Troubleshooting Chart
Service Manual for Dry Channel HDC3/HDC6 Units TROUBLESHOOTING CAUSE REMEDY SYMPTOM Heating Elements do not Unit not plugged in Plug unit in to proper power outlet. heat. Move the Main Power On/Off Switch to on position. Main Power On/Off Switch not in on position Replace Control Board. -
Page 16: Wiring Diagram
Service Manual for Dry Channel HDC3/HDC6 Units WIRING DIAGRAM Electric Control Board PRB-1B PRB-1A PRB-2B PRB-2A PRB-3B PRB-3A 24VAC Connector SSR-3B SSR-3A SSR-2B SSR-2A SSR-1B SSR-1A RTD Cable PROBE 3A To connector PROBE 3B To connector High Limit Heating Element 3A... - Page 17 Service Manual for Dry Channel HDC3/HDC6 Units SINGLE ZONE WIRING DIAGRAM...
- Page 18 Service Manual for Dry Channel HDC3/HDC6 Units NOTES:...
- Page 19 Service Manual for Dry Channel HDC3/HDC6 Units NOTES:...
- Page 20 Service Manual for Dry Channel HDC3/HDC6 Units Duke Manufacturing Company 2305 N. Broadway St. Louis, MO 63102 Phone: 314-231-1130 Toll Free: 1-800-735-3853 Fax: 314-231-5074 www.dukemfg.com P/N 219217C...
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