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CR Series Roasters
(CR-35, CR-70, CR-140, & CR-280)
Installation, Operation & Maintenance Manual
2020
Revision D
DIEDRICH ROASTERS, LLC
P.O. Box 430
Ponderay, Idaho 83852
Toll Free: (844) 343-3742
Fax: (208) 417-1552
Support: (888) 519-0069
Technical Support: support@diedrichroasters.com
PROPRIETARY RIGHTS NOTICE: All rights reserved. No part of this material may be reproduced or transmitted in any form or by means,
electronic, mechanical or otherwise, including photocopy and recording or in connection with any information storage or retrieval system, without
the written permission of Diedrich Roasters, LLC.
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Summary of Contents for Diedrich Roasters CR Series
- Page 1 PROPRIETARY RIGHTS NOTICE: All rights reserved. No part of this material may be reproduced or transmitted in any form or by means, electronic, mechanical or otherwise, including photocopy and recording or in connection with any information storage or retrieval system, without the written permission of Diedrich Roasters, LLC.
- Page 2 Please read all sections of this manual and retain for future reference. Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment. •...
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Page 3: Table Of Contents
CR Series Roasters Installation, Operation and Maintenance Manual Table of Contents INSTALLATION SYSTEM SPECIFICATIONS ........................1 Capacities Table ............................2 COMPONENT DESCRIPTIONS ......................... 2 SITE PREPERATION ..........................4 RECEIVING AND UNPACKING EQUIPMENT ................... 4 ROASTER INSTALLATION ........................5 ROASTER PARTS ............................6 DRUM RETAINING COLLAR ......................... - Page 4 19.0 CLEANING ..............................26 19.1 CHAFF COLLECTION CYCLONES ..................... 26 19.2 IMPELLER REMOVAL .......................... 27 Roast Air Impeller Housing ..........................28 19.3 AIR DUCTS ............................29 19.4 VACUUM SENSOR TUBE ........................30 Vacuum Sensor Tube ............................ 30 19.5 BURNER TRAY ............................ 30 19.6 COOLING BIN ............................
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Page 5: Installation
INSTALLATION SYSTEM SPECIFICATIONS CR-35 CR-70 CR-140 CR-280 BATCH CAPACITY 3.5 / 35kg 10 / 70kg 20 / 140kg 35 / 280kg min/max 200-240 1PH 200-240 1PH VOLTAGE 200-240 3PH 200-240 3PH 200-240 3PH 200-240 3PH CLASS 380-480 3PH 380-480 3PH 380-480 3PH 380-480 3PH BREAKER... -
Page 6: Capacities Table
CR-35 CR-70 CR-140 CR-280 STANDARD COOLING BIN BLOWER 10(254) 14(356) 16(406) 18(457) OUTLET DIAMETER in(mm) ROAST AIR CYCLONE OUTLET 8(203) 14(356) 14(356) 8(203) DIAMETER in(mm) COOLING BIN CYCLONE OUTLET 8(203) 18(457) 24(610) 8(203) DIAMETER in(mm) Capacities Table COMPONENT DESCRIPTIONS NOTE: In this manual, references of left and right-hand side are determined by facing the front of roaster. - Page 7 Chaff Collection Cyclone: The chaff collection cyclone(s) separate the coffee husk from the exhaust air before it is expelled into the exhaust system. The cyclones are positioned at the rear of the roaster and a detachable collection barrel is positioned under the cyclones to collect chaff. The chaff collection barrel requires emptying periodically depending on the type of bean.
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Page 8: Site Preperation
Oxidizer: The oxidizer is a burner system that significantly reduces the amount of smoke from the roaster exhaust. The oxidizer is built of carbon steel with a stainless steel liner and vent connection. The lower section houses the actual burner assembly. The oxidizer is activated automatically when the coffee reaches 250°F (121°C). -
Page 9: Roaster Installation
Optional Optional Oxidizer Cooling Cyclone Optional Destoner Roaster Air Cyclone Optional Roaster & Loader Cooling Bin ROASTER INSTALLATION It is the purchaser’s responsibility to ensure the appropriate codes and regulations, specific to their area, are followed to make sure that proper site engineering and installation requirements are met. Clearances to combustible/non-combustible walls or counters must be considered. -
Page 10: Roaster Parts
ROASTER PARTS DRUM RETAINING COLLAR ATTENTION Remove this split collar before turning on the drum motor. Drum Retaining Collar ATTENTION A split collar is installed on the drum shaft to help prevent the drum from shifting during shipment. The collar MUST be removed before turning on the drum motor. The collar is located at the rear of the roaster between the back plate and the bearing. -
Page 11: Roasting Section
COOLING BIN INSTALLATION The CR Series Roasters have a cooling bin which is placed in front of the roaster. The cooling bin is designed to be raised from the lower front with a fork lift. -
Page 12: Destoner System (Optional)
DESTONER SYSTEM (Optional) The destoner is built in several sections to accommodate a range of installation options; the base unit, the trunk and the silo with vacuum blower. If it is shipped disassembled, all flanges and tube connections must be sealed with a silicone caulking to prevent vacuum leaks. If this is not done, the system may be unable to create the vacuum needed to lift the coffee. -
Page 13: Incoming Regulator
INCOMING REGULATOR ATTENTION If the installation has both a roaster and oxidizer, a separate incoming pressure regulator must be used for each piece of equipment. An incoming regulator must be installed to adjust the incoming pressure to the roasters required pressure as indicated in the Capacities table on page 1. -
Page 14: Automated Roasters
AUTOMATED ROASTERS All CR-Series roasters have a free standing electrical panel Main Control Panel (MCP) which is mounted separately from the roaster. The incoming power is fed to the freestanding electrical panel MCP. The optional destoner receives its power from the freestanding control panel circuit. With the electrical control panel set into position, the conduit can be installed between the roaster and the electrical control panel. -
Page 15: Safety Shut Off Valve
10.1 SAFETY SHUT OFF VALVE A safety shut-off valve must be installed in the air supply line before the connection to the roaster and in a location where it can be reached quickly in an emergency situation. The shut-off must be located close to the machine and must be marked to identify it as the air supply shut-off. - Page 16 This is just a list of companies who are familiar with Diedrich roasters, other manufacturers may be used. Your HVAC specialist may have a recommendation or preferred manufacturer. Some ducting manufacturers have on-site engineers...
- Page 17 to assist you in designing your unique exhaust ducting. Please be advised, positive pressure grease vent is not an off-the-shelf product, plan ahead to compensate for long lead times. Recommended Ducting Manufacturers Selkirk Metalbestos, Inc. www.selkirkusa.com Van-Packer www.vpstack.com Security Chimney International a division of LENNOX Hearth Products www.lennoxhearthproducts.com Jeremias www.jeremiasinc.com...
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Page 18: Operation And Maintenance
OPERATION AND MAINTENANCE 12.0 SAFEGUARDS The proper installation, cleaning, and safe operation of the coffee roasting system are the owner and operator’s responsibility. 1) Prior to cleaning or servicing ensure the circuit breaker in the electrical control box is switched to the off position. Test for power prior to cleaning or servicing. 2) Ensure the coffee roaster is cool to the touch prior to cleaning or servicing. - Page 19 Keeping the roasting system clean internally and externally cannot be over-emphasized. The handling of coffee and the coffee bags creates dust and residues which are a fire hazard. Oil, residues, and certain gases released during roasting are combustible. This residue collects on the internal walls of the airflow passages and presents a significant fire hazard.
- Page 20 DO NOT store or use gasoline or other flammable liquids in the vicinity of this roaster or any other appliances. IF YOU SMELL GAS: • Evacuate the building to a safe distance. • Do not try to light any appliance. •...
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Page 21: Operator Control Console - Manual Roaster
13.0 OPERATOR CONTROL CONSOLE – MANUAL ROASTER (panel will vary) Manual Roaster Operator Control Console Emergency stop: The emergency stop button turns off all control power when pushed in. All of the motors will stop and the gas will shut off. When pulled out to the “ON” position the roaster can once again start the motors. - Page 22 ATTENTION Always keep the drum rotating until roaster is cooled down to below 250°F (121°C). To start the drum motor push “START”. The light will illuminate after the motor has started. Drum: To stop the drum motor press “STOP”. CR-35 Variable speed is controlled by a knob on the console.
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Page 23: Roaster Control Panel
Activate the water quench by pushing “START”. The light will illuminate while quenching. Quench: The quench time is controlled by a timer located in the roaster electrical cabinet. It is factory set to a quantity listed in the Technical Table of the Installation Guide.You can also stop the water quench before the timer by pushing “STOP”. -
Page 24: Seasoning The Roasting Drum
2. Turn on the “DRUM”, “Roast Air” and “GAS” buttons. 3. After the ignition system goes through purge cycle, the pilot should light. 4. Once the pilot is lit, switch to the "BURNERS -1" or “BURNERS -2” position and use the gas control knob to adjust the gas. -
Page 25: Roasting For Consumption
When the coffee reaches the yellow stage 280°F (138°C); the Roast Air Control Dial should be moved to the "5" (mid) position. As the coffee reaches the yellow stage, the moisture in the coffee that was a good conductor of heat early on in the roast, is now turning to steam. At this stage in the roast, the air flowing through the roasting drum becomes a more uniform heat medium. - Page 26 If roasting a full capacity batch, preheat the empty drum until the digital unit reads 440º (226ºC) or until you reach your desired charge temperature. Depending on type of coffee, batch size, and roasting technique charge temperatures will typically be between 420°F (215°C) and 440°F (227°C).
- Page 27 As more airflow through the drum is needed, move the “ROAST AIR” control dial to the maximum (9) setting. This is the most significant stage of bean development. At this stage the beans fully open up and, for a lighter roast, the roasted coffee may be ready to release into the cooling bin. The operator should pay close attention to the coffee.
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Page 28: Shut Down
17.0 SHUT DOWN 1. Set the gas switch to “PILOT” position. “STOP” 2. Press the gas button. 3. Set the “ROAST AIR” control dial to the maximum (9+) position to cool the roasting drum. 4. After the temperature reading has dropped to 250°F (121°C) or lower, press the “BLOWER” and “DRUM”... - Page 29 Diedrich Roast Log Date Type of Coffee Weight In Weight Out % Wgt Loss Roast Time Comments Total roasting time Note: The green weight IN minus the roasted weight OUT divided by green weight IN equals the percentage of Example: 15 lbs IN - 12.75 lbs OUT = 2.25 lbs / 15 = 15% weight loss...
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Page 30: Cleaning
19.0 CLEANING CLEANING AND MAINTENANCE OF THE ROASTER IS EXTREMELY IMPORTANT FOR CUP QUALITY, ROASTER PERFORMANCE AND SAFETY. Keeping the roasting system clean internally and externally cannot be over-emphasized. The oil and dust mixture that accumulates is a fire hazard. A dirty system also makes servicing more difficult. -
Page 31: Impeller Removal
If any smoldering chaff is found, spray with water to extinguish. NEVER LEAVE THE ROASTER DURING OR AFTER ROASTING UNTIL THE CYCLONE BARREL IS EMPTIED. 19.2 IMPELLER REMOVAL Below are instructions for the removal of impellers with the taper lock system. (See pictures on next page.) 1. - Page 32 Page 28 of 35...
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Page 33: Air Ducts
Hit here. Hit here. Clean the fan blade thoroughly as an uneven cleaning will create an imbalance and vibration when the blower is turning. To install the fan blade, reverse the disassembly procedure. Ensure that the fan blade is centered in the housing and turns freely by hand prior to turning on the blower motor. -
Page 34: Vacuum Sensor Tube
Use an awl to poke debris from the holes of the screen. Diedrich Roasters offers a hand roller that is helpful in this process. Use a wire brush on the underside of the screen to dislodge remaining debris. Wipe down the agitator assembly sweepers. -
Page 35: Routine Maintenance
To remove the cooling bin screen: 1. Lift agitator assembly from gearbox drive shaft. 2. Remove screws from the screen around the bean discharge plate(s). 3. Remove the screws holding the screen to cross-bar support assembly. 4. Remove screws holding the screen retainer strap and lift out strap. 5. -
Page 36: Motors
WARNING! Keep fingers, hair and loose clothing clear of moving parts. 20.0 MOTORS The electric motors are sealed and no service is required. 21.0 DRUM SHAFT BEARINGS The bearings should be lubricated every 8 operating hours, NOT roasting time. Operating time is the time the roaster is turned “ON”... -
Page 37: Drum Gearbox Oil Capacities
Upon regular changing of oil in gearbox, all oil should be checked for foreign objects indicating abnormal wear. Refill with ISO grade 460 Dodge 334863 gearbox oil (or equivalent). See Table for capacities of gearboxes. Drum Gearbox Oil Capacities Roaster Capacity Model oz(liter) -
Page 38: Roaster Maintenance Chart
Roaster Maintenance Chart DIEDRICH MAINTENANCE Chart Date Signature 4 hours Roast air cyclone: Empty chaff collection barrel 4 hours Cooling bin cyclone Empty chaff collection barrel Daily Cooling Bin: Vacuum compartment under the screen Daily Cooling Bin: Clean cooling screen Daily Drum: Remove chaff from tray below drum Daily... - Page 39 DIEDRICH MAINTENANCE Chart Date Signature Biannually Roast air cyclone: Inspect motor Agitator: Inspect shaft bearing Biannually Biannually Agitator & Cooling Bin: Inspect motor Agitator & Cooling Bin: Inspect gearbox for signs Biannually of leaks Biannually Air system: Inspect air lines Biannually Air system: Inspect air solenoids Biannually...
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