www.conairnet.
Please record your equipment’s model and serial number(s) and the date you received it in the spaces provided. It’s a good idea to record the model and serial number(s) of your equipment and the date you received it in the User Guide. Our service department uses this information, along with the manual number, to provide help for the specific equipment you installed. Please keep this User Guide and all manuals, engineering prints and parts lists together for documentation of your equipment.
Ta b l e o f C o n t e n t s 1-1 I n t r o d u c t i o n Purpose of the User Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 How the guide is organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Using the D series as a central dryer . . . . . . . . . . . . . . . . . . . . . . 1-3 Your responsibilities as a user . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 ATTENTION: Read this so no one gets hurt . . . . . . . . . . . . . . . . . .
Checking for proper air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 Connecting the air hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 Connecting water hoses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 Connecting the RTD probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 Connecting the Optional Setback RTD . . . . . . . . . . . . . . . . . . . . . 3-16 Mounting a loader on the hopper . . . . . . . . . . . . . . . . . . . .
6-1 Tr o u b l e s h o o t i n g Before beginning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 A few words of caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 DIAGNOSTICS How to identify the cause of a problem . . . . . . . . . . . . . . . . . . . . 6-4 Shut down alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 Passive alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 Setback . . . .
C Appendix Installing an aftercooler (optional) . . . . . . . . . . . . . . . . . . . . . . . . C-1 Cleaning the aftercooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3 D Appendix Installing the flow control (optional) . . . . . . . . . . . . . . . . . . . . . . . D-1 E Appendix Installing a precooler (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 Cleaning the precooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The MDC control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12 MDC control functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12 To start drying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12 To stop drying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-12 Using the auto start countdown function . . . . . . . . . . . . . . . . . . G-12 Setting the high setpoint limits . . . . . . . . . . . . . . . .
v i l Ta b l e o f C o n t e n t s
SECTION 1 Purpose of the user guide . . . . . . . . . . . . . 1-2 How the guide is organized . . . . . . . . . . . . 1-2 Using the D series as a central dryer . . . . . . 1-3 Yo u r r e s p o n s i b i l i t i e s a s a u s e r . . . . . . . . . . 1 - 3 AT T E N T I O N : Read this so no one gets hurt . . . . . . . . 1-4 How to use the lockout device . . . . . . . . . .
Purpose of the User Guide This User Guide describes the Conair D series of carousel dehumidifying dryers and explains step-by-step how to install, operate, maintain and repair this equipment. Before installing this product, please take a few moments to read the User Guide and review the diagrams and safety information in the instruction packet. You also should review manuals covering associated equipment in your system.
Using the D Series as a Central Dryer This box will contain information or highlight system differences particular to the application of the D series dryer as a central dryer. Central Yo u r R e s p o n s i b i l i t y a s a U s e r You must be familiar with all safety procedures concerning installation, operation and maintenance of this equipment. Responsible safety procedures include: • Thorough review of this User Guide, paying particular attention to hazard warnings, appendices and related diagrams.
AT T E N T I O N : Read this so no one gets hurt We design equipment with the user’s safety in mind. You can avoid the potential hazards identified on this machine by following the procedures outlined below and elsewhere in the User Guide. WA R N I N G : I m p r o p e r i n s t a l l a t i o n , o p e r a t i o n , o r servicing may result in equipment damage or p e r s o n a l i n j u r y.
How to Use the Lockout Device 1 Stop or turn off the equipment. 2 Isolate the equipment from the electric power. Turn the rotary disconnect switch to the OFF, or “O” position. 3 Secure the device with an assigned lock or tag. Insert a lock or tag in the holes to prevent movement. 4 The equipment is now locked out.
1-6 l Introduction
SECTION 2 What is the D carousel dryer? . . . . . . . . . . 2-2 Ty p i c a l a p p l i c a t i o n s . . . . . . . . . . . . . . . . . 2 - 2 How it works . . . . . . . . . . . . . . . . . . . . . . 2-4 Specifications: D dryer . . . . . . . . . . . . . . .
What is the D Carousel Dryer? The D carousel dehumidifying dryer produces hot, low-dew point air that removes moisture from hygroscopic plastics. The dryer pulls warm, moist air from a drying hopper and pumps it through dehumidifying desiccant. The dryer then heats the air to the drying temperature you selected and circulates it through the material in the hopper.
Ty p i c a l A p p l i c a t i o n s (continued) Central Model Drying Temperature Range Low temperature (with precooler)* 100° - 150°F (38° - 66°C) Standard 150° - 250°F (66° - 121°C) High heat (with aftercooler) 150° - 375°F (66° - 191°C) Low-high (with aftercooler & precooler)* 100° - 375°F (38° - 191°C) *Note: See instruction on page 4-12 for setpoints over 150°F (66°C). • Throughput rates of 15 to 100 lbs (6.8 to 37.3 kg) per hour (some materials can be run at a higher rate).
H o w I t Wo r k s The D carousel dryer achieves continuous, closed loop drying by passing air simultaneously through two heaters and three tanks of molecular sieve desiccant. THE PROCESS (DRYING) CYCLE The process blower pulls moist air from the top of the drying hopper. The air passes through the process filter (and optional aftercooler, if installed) into the dryer’s desiccant tank, where moisture is removed.
H o w I t Wo r k s 1 (continued) 6 1 11 10 REGENERATION BLOWER REGENERATION AIR FILTER 9 HIGH TEMP SHUTOFF HIGH TEMP SHUTOFF 4 PROCESS HEATER BOX REGENERATION HEATER 4 REGENERATION RTD HOPPER DESICCANT TANKS 3 5 BEDPLATE 9 RETURN AIR FILTER 8 RETURN AIR RTD 2 PROCESS PROCESS BLOWER COOLING REGENERATION DRYER OPTIONS 1 SET BACK TEMPERATURE 2 PROCESS CFM MONITOR 3 PM1 / DEW POINT MONITOR 4 CURRENT METER 5 PROCESS FILTER STATUS 6 PHASE ROTATION PROTECTION 7 PRECOOLER 8 AFTERCOOLER 9 FL
Specifications: D Carousel DEHUMIDIFYING DRYERS D Small Series Carousel Dryers A D C B MODEL D15 D25 D50 D75 Performance characteristics (with full hopper) 12 20 35 50 Air flow {SCFM}* Air flow {ACFM @ 250°}* 16 27 47 67 Drying temperature All models 100 - 375° F {38 - 191° C} with options Dew point All models -40° F {-40° C} Dimensions inches {cm} A - Height 35.5 {90.2} 35.5 {90.2} 35.5 {90.2} 42.1 {107} B - Overall width 17.3 {43.9} 17.3 {43.9} 17.3 {43.9} 22.0 {55.9} C - Control width 15.7 {39.9} 15.
Specifications: D Carousel (continued) OPTIONAL HOPPERS AND MOUNTING BRACKET CH14-4 12.5 {31.8} 54 {137.2} 7.5 {19} 39 {99.1} 17 {43.2} 45 {114.3} 6.5 {16.5} 41 {104.1} 17 {43.2} 56 {142.2} 6.5 {16.5} 41 {104.1} 17 {43.2} 67 {170.2} 6.5 {16.5} 41 {104.1} 20 {9.0} 30 {13.6} 40 {18.1} 30 {13.6} 1.5 {42.5} 60 {27.2} 30 {13.6} 2 {56.6} 80 {36.3} 35 {15.9} 3 {85} 120 {54.4} 35 {15.9} 4 {113.2} 160 {72.5} 35 {15.9} 40 {18.1} 50 {22.7} 70 {31.7} 80 {36.32} 95 {43.1} 110 {48.
2-8 l Description
SECTION 3 Installation Unpacking the boxes . . . . . . . . . . . . . . . . . 3-2 Preparing for installation . . . . . . . . . . . . . . 3-4 Po s i t i o n i n g t h e d r y e r o n t h e f l o o r ; mounting the hopper on the throat . . . . . 3-8 Mounting the hopper . . . . . . . . . . . . . . . . . 3-9 Po s i t i o n i n g t h e d r y e r o n t h e f l o o r . . . . . . . . 3 - 9 Mounting the dryer on the floor stand; hopper on the throat . . . . . . . . . . . . .
Unpacking the Boxes The D carousel dryer comes in one to four boxes, depending on the model and options ordered.
Unpacking the Boxes (continued) 4 Take a moment to record serial numbers and electrical power specifications in the blanks provided on the back of the the User Guide’s title page. The information will be helpful if you ever need service or parts. 5 You are now ready to begin installation.
Preparing for Installation The D carousel dryer is easy to install if you plan the location and prepare the mounting area properly. 1 Make sure the mounting area provides: ❒ A grounded power source supplying the correct current for your dryer model. Check the dryer’s serial tag for the correct amps, voltage, phase, and cycles. Field wiring should be completed by qualified personnel to the planned location for the dryer. All electrical wiring should comply with your region’s electrical codes.
Preparing for Installation (continued) ✐ ❒ A mounting surface that will support the weight of the dryer, support frame, and a fully-loaded hopper, or just the fully-loaded hopper. See the specifications tables for weights and volumes. ❒ Material and conveying lines installed. If you plan to use vacuum or compressed air loaders to fill the hopper, install conveying lines to the drying hopper location.
Mounting the Dryer and Hopper on a Processing Machine WARNING: You are responsible for the structural integrity of this installation. We recommend that you: ❒ Use bolts no smaller than 3/8 inch (M 10) when mounting the hopper/dryer combination to the throat of a processing machine. ❒ Do not mount the hopper/dryer combination on a plate that swings away or slides away from the processing machine throat.
Mounting the Dryer and Hopper on a P r o c e s s i n g M a c h i n e (continued) The drying hopper, slide gate, support frame, and discharge assembly may have been shipped fully assembled. You can remove the hopper from the support frame, if you find it easier to lift and bolt the frame and then the hopper to the throat of the processing machine. 1 Lift the hopper, support frame, and discharge assembly onto the processing machine throat. Use a hoist to lift the support frame and hopper.
Po s i t i o n i n g t h e D r y e r o n t h e F l o o r ; Mounting the Hopper on the Throat WARNING: You are responsible for the structural integrity of this installation. We recommend that you: • Use bolts no smaller than 3/8 in. (M 10) to mount the hopper on the throat of a processing machine. Tools for installation: ❒ 9/16” wrench ❒ Flathead screwdriver ❒ Hoist The hopper bolts to the throat of the processing machine, as pictured above.
Mounting the Hopper CAUTION: To prevent accident and injury, lift the empty hopper onto the throat of the processing machine using a hoist and the lifting lugs provided. Also lift the dryer from the shipping container using a hoist and the lifting lugs provided. 1 Lift the hopper onto the throat. Lift the hopper with a hoist, using the lifting lugs provided. Make sure you align the bolt holes in the throat with the bolt holes on the discharge assembly.
Mounting the Dryer on the Floor Stand; Hopper on the Throat For information about mounting the dryer on the floor stand and the hopper on the throat, refer to Appendix B. Mounting the Dryer and Hopper on the Mobile Floor Stand For information about mounting the dryer and hopper on the mobile floor stand, refer to Appendix B. C o n n e c t i n g t h e M a i n Po w e r CAUTION: Always disconnect and lock out the main power sources before making electrical connections.
C o n n e c t i n g t h e M a i n Po w e r (continued) IMPORTANT: Always refer to the wiring diagrams that came with your dryer before making electrical connections. nect holder. 4 Connect the ground wire to either grounding point as shown in the photo.
Checking for Proper Air Flow This step is only needed on 50, 75, and 100 models if the phase detection option was not ordered with the dryer. CAUTION: This step must be performed before the dryer’s air hoses are connected to the hopper. Performing this step after the air hoses are connected could cause damage to the dryer if the air flow direction is incorrect due to improper phase connection. Material from the hopper can be pulled into the process heater, causing permanent damage.
Checking for Proper Air Flow 3 Press the START button. Hold your hand near the delivery (continued) Start air outlet. You should feel air blowing out of the outlet. 4 Press the STOP button. Stop Return Air Inlet Return Air Inlet Moisture exhaust Delivery air outlet (15, 25, and 50 models) Delivery air outlet (75 and 100 models) CAUTION: Hot surface Do not place your hand on the delivery air outlet. The outlet and the air can get hot enough to burn your hand.
Checking for Proper Air Flow (continued) ✐ INSTALLATION NOTE: Models 50, 75, and 100 These models use a three-phase process blower. If the dryer shuts down and a Process Loop Break shutdown alarm is indicated within the first few minutes of operation, check for proper air flow. If the air flow is reversed, the process blower is turning in the wrong direction. Turn off and lock out the main power source. Open the electrical enclosure and reverse any two leads connecting the main power supply to the dryer.
Connecting the Air Hoses Using the two flexible hoses provided, connect the inlets and outlets of the drying hopper to the dryer. If you have positioned the dryer on the floor or mounted it to an optional floor stand, make sure the dryer is located no more than 5 feet (1.5 m) from the hopper to reduce heat loss. 2 Attach the hose to the hopper’s delivery air inlet labeled “To Hopper”. Delivery air outlet (15, 25, and 50 models) Delivery air outlet (75 and 100 models) 3 Secure hoses with clamps.
C o n n e c t i n g t h e RT D P r o b e The RTD probe monitors the temperature of the drying air as it enters the hopper. If the probe is not installed correctly, temperature readings will be inaccurate. Central When configured as a central dryer, monitoring the drying air temperature is not necessary since there is no process heater in the system. Therefore, installation and connection of this RTD probe is not applicable. 1 Insert the probe at the inlet to the hopper.
Mounting a Loader on the Hopper If you have a Conair loader or vacuum receiver, you can use the flange and mounting clips provided on the top of the hopper. Refer to the manuals that came with your receiver or loader for detailed installation instructions. Te s t i n g T h e I n s t a l l a t i o n You have completed the installation. Now it’s time to make sure everything works. 1 Make sure there is no material in the hopper. If you 2 Turn on the main power to the dryer.
Te s t i n g T h e I n s t a l l a t i o n (continued) 4 Press the START button. Start If everything is installed correctly: • The green light on the start button will illuminate. • The process and regeneration blowers turn on. • The process and regeneration heaters turn on. • The regeneration heater turns on. Central • If the desiccant tanks are not in their correct position, the carousel will turn clockwise and stop in the correct position. 5 Press the STOP button.
SECTION 4 Operation The DC-1 dryer control panel . . . . . . . . . . . 4-2 D dryer DC-1 control functions . . . . . . . . . . 4-3 Control function descriptions . . . . . . . . . . . 4-5 To s t a r t d r y i n g . . . . . . . . . . . . . . . . . . . . 4 - 1 7 To s t o p d r y i n g . . . . . . . . . . . . . . . . . . . . 4 - 1 8 Using the auto start countdown function . . . 4-19 How to enable the auto start on the DC-1 conrtol . . . . . . . . . . . . . . . . . . . . . .
T h e D C - 1 D r y e r C o n t r o l Pa n e l Increment/ Decrement Buttons S e t Po i n t Display Actual Display Used to increase or decrease values. Shows the set point value. Shows the actual temperature value. Set Point Alarm Codes See “Troubleshooting” Section 6 for a more complete listing of alarm codes. Shutdown Alarms A1 Process High Temp. A2 Process Loop Break A3 Process Heater High Temp. A4 Regen. Heater High Temp.
D Dryer DC-1 Control Functions Dryer functions are values that you can set or monitor. Press the Scroll button until the function you want to set or monitor appears in the LED display. ✐ Note: Grey shaded screens denote optional functions. If the options were not purchased with the dryer, those screens will not appear. All options can be purchased and installed in the field. Control Function Flow Chart The following flow chart provides a quick summary of the control functions.
POWER ON screen # 1 Pr 2 d 25 5 sec v00 09.5 1 sec Central 4 d v00 01.0 1 sec 5 1 5 1 250 250 Process Temp Default Screen 6 2 425 425 Regen Temp 7 3 100 100 Return Air Temp 8 4 16 On Auto Start 9 5 10 ----- Load Time (MDC) 10 6 150 120 Activate Setback Temp (Option) 11 7 145 250 Setback Temp Process (Option) 12 8 5 13 9 -30 CNT DRY When supplied for central drying applications, these control functions are not available.
Control Function Descriptions Screen Function SCREEN 1 Once power is turned on, this screen is displayed for 5 sec. while the control does some self-checking. Pr up SCREEN 2 d 25 v00 d v00 SCREEN 5 (Default Screen) 1 250 250 SCREEN 5 (Default Screen) 1 CNT 425 Indicates configuration as a central dryer. DRY SCREEN 6 2 This is the DEFAULT screen. It shows the process air temperature setpoint and actual temperature measured at the inlet to the drying hopper.
Control Function Descriptions Screen Function SCREEN 7 This screen shows the actual return air temp measured at the inlet to the process blower. If the optional aftercooler flow control is installed, a setpoint will be displayed on this screen as well. The + / buttons can be used to change the set point. Holding the + / - buttons in will cause the number to ramp up faster the longer the button is held.
Control Function Descriptions (continued) Screen Function SCREEN 10 (Setback Temperature Option) If the dryer has the setback on temperature option installed, this is the temperature setpoint for the air at the outlet of the drying hopper. When this setpoint is reached, the dryer will automatically change the process setpoint to the setpoint shown on Menu number 7, Screen 11.
Control Function Descriptions Screen Function SCREEN 13 (PM1 and/or DEWPOINT MONITOR Options) If the dryer has the dewpoint monitor option installed, this screen will show the actual dewpoint of the process delivery air measured after the desiccant tank in the process position but before the process heater. If the Power Miser 1 (PM1) option is installed, there will also be a setpoint shown on this screen.
Control Function Descriptions (continued) Function Screen Screens 15-27 require access code 754. SCREEN 15 (Set up Screen) C 10 C01 SCREEN 16 (Set up Screen) C 400 C02 off C03 SCREEN 18 (Set up Screen) C 425 off This is the process heater autotune screen. The autotune function can be turned on by pressing the + key. Once the + key is pressed, the screen will show On and then start the autotune process. This may take a minute or so to complete. When finished, the display will read "don".
Control Function Descriptions (continued) Function Screen Screens 15-27 require access code 754. Central When supplied for central drying applications, this function is not available. SCREEN 20 (Set up Screen) MDC Option C 10 C06 SCREEN 21 (Set up Screen) C tim C07 SCREEN 22 (Set up Screen) Setback Temperature Option C Central When supplied for central drying applications, this function is not available.
Control Function Descriptions (continued) Function Screen Screens 15-27 require access code 754. SCREEN 23 (Set up Screen) Aftercooler Flow Control Option C off C09 SCREEN 24 (Set up Screen) Setback Temperature Option C off C10 off C11 This screen shows the setting of the setback load rate option. It can be set to Off or On. “Off” turns the setback load rate function off, and the dryer will not change the process set point.
Control Function Descriptions (continued) Function Screen Screens 15-27 require access code 754. SCREEN 26 (Set up Screen) Precooler Option C Central When supplied for central drying applications, these functions are not available. off C12 WARNING: The precooler must NOT be installed in the process line for temperature setpoints above 150°F (65.5°C). The precooler hosing will absorb too much heat and will result in poor process temperature control.
Control Function Descriptions (continued) Function Screen Screen 28-43 require access code 755. SCREEN 29 (Test Mode Screen) H off 2 This is the Test Mode screen for the process heater. By pressing the + or keys, the setting can be changed. When set to "On", the process heater output will be turned on for 3 sec. and then shut off automatically. ✐ Note: The isolation contactor will not be pulled in so no electricity will go the heater. The solid state relay contacts should close.
Control Function Descriptions Function Screen (continued) Screen 28-43 require access code 755. SCREEN 34 (Test Mode Screen) H off 7 SCREEN 35 (Test Mode Screen) H off 8 This is the Test Mode screen for the isolation contactor. By pressing the + or - keys, the setting can be changed. When set to "On", the isolation contactor output will be turned on for 3 sec. and then shut off automatically. This is the Test Mode screen for the alarm output (horn and or red light).
Control Function Descriptions (continued) Function Screen Screen 28-43 require access code 755. SCREEN 39 (Test Mode Screen) H off 12 This is the Test Mode screen for the MDC conveying blower. By pressing the + or keys, the setting can be changed. When set to "On", the conveying blower output will be turned on for 3 sec. and then shut off automatically. ✐ Note: If the dryer is not an MDC, nothing will happen.
Control Function Descriptions (continued) Function Screen Access code 756 required. SCREEN 44 (Alarm Screen) 4-16 l Operation A 1 P3 A 2 A1 A 3 A5 A 4 A4 A 5 P1 A 6 P5 A 7 A7 A 8 A2 A 9 A6 A 10 P2 This is the first Alarm History screen. In this section, the last 10 alarms that have occurred are saved, starting with the most recent alarm. The number in the setpoint screen shows the list of alarms 1-10. The alarm code shows up in the actual screen.
To S t a r t D r y i n g 1 Make sure there is material in the hopper. 2 Turn on the main power to the dryer. Make sure the dryer’s disconnect dial is in the ON position. This powers up the control and the display lights will illuminate. 3 Set the drying temperature. Use the Scroll button to get to the Process Temp function. Press the Adjust Setpoint ▲ or J buttons to select the temperature.
To S t a r t D r y i n g (continued) 4 Press the START button. Start If everything is installed correctly: • The green light on the start button will illuminate. • The process and regeneration blowers turn on. • The process and regeneration heaters turn on. • The regeneration heater turns on. Central • If the desiccant tanks are not in their correct position, the carousel will turn clockwise and stop in the correct position. To S t o p D r y i n g Stop 1 Press the STOP button.
Using the Auto Start Countdown Function The countdown function allows the user to set the D Carousel dryer to automatically start at a predetermined time. The countdown time can be set from 0.1 to 150.0 hours. To set the countdown time: 1 Use the Scroll button to access the function (Menu 4, Screen 8). 4 16 ON Auto Start 2 Use the Setpoint Adjust keys to set the desired countdown time. How to Enable the Auto Start on the DC-1 Control 2 Increment the Auto Atart Time with the plus key.
Setting the High Setpoint Limits You can protect your drying process by preventing someone from entering process temperatures above an acceptable level for the material. You can also set the high limit equal to the process temperature to prevent accidental or unauthorized changes to the setting during operation. 1 Turn on the main power to the dryer.
SECTION 5 Maintenance Preventative maintenance checklist . . . . . . . 5-2 Cleaning the hopper . . . . . . . . . . . . . . . . . 5-3 Cleaning the process filter . . . . . . . . . . . . . 5-4 Cleaning the regeneration filter . . . . . . . . . 5-4 Cleaning the aftercooler coils . . . . . . . . . . . 5-5 Cleaning the precooler coils . . . . . . . . . . . . 5-5 Inspecting hoses and gaskets . . . . . . . . . . .
Preventative Maintenance Checklist Routine maintenance will ensure optimum operation and performance of the D Carousel Dryer. We recommend the following maintenance schedule and tasks. • Whenever you change materials ❒ Drain and clean the hopper. • We e k l y, o r a s o f t e n a s n e e d e d ❒ Clean the process and regeneration filters. You may need to clean filters more often than weekly. Frequency depends on how much material you process and how dusty or full of fines it is.
Cleaning the Hopper CAUTION: Hot surfaces. Always protect yourself from hot surfaces inside and outside the dryer and drying hopper. The hopper, spreader cone, and discharge assembly should be cleaned thoroughly between material changes to prevent resin contamination. Place a container beneath the hopper’s drain port to catch the material. 1 Close the hopper slide gate. 2 Remove the drain-port plug. Pull the pin and allow the plug to drop. 3 Remove the spreader cone. Open the hopper door.
Cleaning the Process Filter Clogged filters reduce air flow and dryer efficiency. Cleaning frequency depends on how much material you process and how dusty it is. 1 Remove the process filter. Remove the black plastic knob. Pull the cap off. Remove the wing nut. Remove the filter cap and filter. 2 Clean the filter tube. 3 Using compressed air, clean the process filter by blowing air from the inside out. Replace damaged, worn, or clogged filters. CAUTION: Wear eye protection.
Cleaning the Aftercooler Coils If you have the optional aftercooler, you need to clean the cooling coils to keep them working efficiently. See Appendix C for details. Cleaning the Precooler Coils If you have the optional precooler, you need to clean the cooling coils to keep them working efficiently. See Appendix E for details. Inspecting Hoses and Gaskets Loose or damaged hoses and gaskets can allow moisture to seep into the closedloop drying system.
5-6 l Maintenance
SECTION 6 Tr o u b l e s h o o t i n g Before beginning . . . . . . . . . . . . . . . . . . . 6-2 A few words of caution . . . . . . . . . . . . . . 6-3 DIAGNOSTICS How to identify the cause of a problem . . . . 6-4 Shut down alarms . . . . . . . . . . . . . . . . . 6-5 Pa s s i v e a l a r m s . . . . . . . . . . . . . . . . . . . 6 - 1 0 Setback . . . . . . . . . . . . . . . . . . . . . . . . 6-15 R E PA I R Replacing fuses . . . . . . . . . . . . . . . . . . . 6-17 Checking heater solid state relays .
Before Beginning You can avoid most problems by following the recommended installation and maintenance procedures outlined in this User Guide. If you do have a problem, this section will help you determine what caused it and how to fix it. Before you take the side panels off of the dryer be sure to: ❏ Diagnose causes from the control panel. 1 Press once to silence the optional audible alarm and display the alarm message. 2 3 Address the alarm message and fix the problem. Press again to clear the alarm.
Open the electrical enclosure to check fuses and heater contactors. ❏ Find the wiring and equipment diagrams that were shipped with your dryer. These diagrams are the best reference for correcting a problem. The diagrams also will note any custom features, such as special wiring or alarm capabilities, not covered in this User Guide. A Fe w Wo r d s o f C a u t i o n The D Carousel dryer is equipped with numerous safety devices. Do not remove or disable them.
How to Identify the Cause of a Problem Most dryer malfunctions are indicated by an illuminated Acknowledge Alarm light on the D carousel dryer control panel. A problem can trigger two types of alarms: • Shut Down: The dryer has automatically shut down because it detected a serious problem that could damage your material or dryer. • Passive: The dryer continues to operate, but warns of a problem that could prevent correct drying of your material.
Shut Down Alarms Central When supplied for central drying applications, these shut down alarms are not available. If the red Acknowledge Alarm LED is blinking, the alarm is a shutdown alarm. The dryer will shutdown automatically to prevent damage to the equipment or personnel. Note that once the Acknowledge Alarm button is pressed once, the blinking red LED becomes solid.
Shut Down Alarms Problem Possible cause Solution A4 The regeneration exhaust is blocked or the air hoses are loose. Check that the bed plates are in the proper position (lined up with the hoses). See “Adjusting the limit switch”. Regen Heater High Temperature – The snap switch in the regeneration heater tube activated due to excessive temperature. Tighten any loose hoses. The isolation contactor failed in the closed position. Replace the isolation contactor.
Shut Down Alarms Problem Possible cause Solution A8 The tubing going to the pressure switch is cut or has come loose. Check the tubing for cracks and make sure it is secure on the fittings. The process blower overload has tripped. Check the process blower overload. If it is tripped, check the process blower to make sure its not locked. Make sure the overload is set slightly above the full load current shown on the motor nameplate. Refer to your wiring diagram for proper settings.
Shut Down Alarms Central When supplied for central drying applications, these shut down alarms are not available. Problem Possible cause Solution A49 Process Protection High Temperature – If the process protection temperature exceeds the process protection high temperature setpoint, it shuts down the dryer. Defaults are set to 600°F (315.6°C) for 10 sec. The Process RTD temperature probe is not installed correctly. Make sure the RTD temperature probe tip is in the center of the hopper inlet tube.
Shut Down Alarms Problem Possible cause Solution A53 Process Blower Overload – The process blower overload has tripped due to a mechanical or electrical problem. The process blower has mechanically failed or is unable to rotate freely. With the power removed, check the process blower for mechanical failure and free rotation. Replace if necessary. Wait 3 to 15 minutes with the power on until the dryer indicates the overload condition has cleared then try to restart the dryer.
Pa s s i v e A l a r m s If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm. The dryer continues to operate, but this problem could prevent correct drying of your material. Note that once the Acknowledge Alarm button is pressed once, the blinking amber LED becomes solid. Central When supplied for central drying applications, these passive alarms are not available. Problem Possible cause Solution P1 One of the solid state relays (SSRs) failed in the closed position.
Pa s s i v e A l a r m s Solution P5 The hopper does not contain enough material. Make sure your material supply system is working properly. You are drying at a high drying temperature (above 250°F [121.1°C]) or running at low throughputs. Add an optional aftercooler, if one is not currently installed. If an optional aftercooler is installed, it does not have enough water. Turn on the water supply, or fix any leaks or blockages. The aftercooler coils are dirty. Clean the aftercooler coils.
Pa s s i v e A l a r m s Problem Possible cause Solution P9 The hose or wiring connections to the sensor block are loose or have fallen off. Check wiring and hose connections to the sensor, re-secure if needed. Desiccant level low. Replace tanks or repack desiccant. See “Replacing the Desiccant Tanks” Page 6-21 “Refilling the Desiccant Tanks” Page 6-22. The desiccant may be contaminated. Check the desiccant for contamination, replace if needed. Leaks in the process air stream.
Pa s s i v e A l a r m s P23 The MDC blower has mechanically failed or is unable to rotate freely. With the power removed, check the MDC blower for mechanical failure and free rotation. Replace if necessary. Wait 3 to 15 minutes with power on until the dryer indicates the overload condition has cleared then try to restart the dryer. The MDC blower has failed electrically. With the power removed, check the MDC blower for electrical shorts or open circuits. Replace if necessary.
Pa s s i v e A l a r m s Problem Possible cause Solution P26 The connection in the electrical enclosure for the regen RTD is loose. Check the RTD plug connection and tighten if needed. The connection of the RTD plug on the control board is loose. Check the plug connection and tighten if needed. The regen RTD has failed. Replace the regen RTD. The connection in the electrical enclosure for the return air RTD is loose. Check the RTD plug connection and tighten if needed.
Setback The setback function available on the DC-1 Dryer is designed to save you money on energy costs and keep you from over drying your material. Setback is available as separate options on both the temperature and load rate setting. Central This is how setback operates when the control setback is set to "On" on "Temperature" (Screen 24) (optional on DC-1 controls). The control monitors the temperature of the air exiting the drying hopper.
Setback (continued) 4 Use Screen 11 to set the temperature setpoint to which the process air will revert to once the air at the outlet of the drying hopper has reached its setpoint. 5 Use the setback temperature band screen (Screen 22) to set the amount the return air temperature has to drop below to activate setback temperature before the original process temperature is restored. For example, if the activate setback temperature was 180ºF (82.
Replacing Fuses 1 Disconnect and lockout the main power supply. 2 Open the electrical enclosure door. 3 Check the fuse. If necessary, pull the fuse out and replace it with a fuse of the same type and rating. IMPORTANT: Always refer to the wiring diagrams that came with your dryer to locate specific electrical components. Illustrations in the User Guide are intended to be representative only.
Checking Heater Solid State Relays 1 Disconnect and lockout the main power supply. 2 Open the electrical enclosure. 3 Locate the process or regeneration contactors. Refer to the wiring diagrams that came with your dryer. 4 Check continuity using an ohmmeter. Regeneration heater solid state relays If ohms equal zero or infinity, replace the contactor. IMPORTANT: Always refer to the wiring diagrams that came with your dryer to locate specific electrical components.
C h e c k i n g o r R e p l a c i n g Te m p e r a t u r e Sensors The D carousel dryer uses RTD sensors to monitor the temperatures of the drying air, the return air, the regeneration exhaust, and the regeneration and process heater boxes. IMPORTANT: Always refer to the wiring diagrams that came with your dryer to locate specific electrical components. Illustrations in the User Guide are intended to be representative only.
Adjusting the Limit Switch 1 Stop the dryer. Disconnect and lockout the main power. 2 Remove the right side panel from the dryer. IMPORTANT: Note the position of the tanks. 3 Loosen the screws securing the limit switch to the carousel. Note that the hole for the front screw is slotted to allow for adjustment. 4 Slide the switch to the left or right to position the limit switch so that its small roller drops into the valley on the bed plate.
Replacing the Heaters Regeneration Heater 1 Disconnect and lockout the main power. 2 Gain access to the regeneration heater by removing the right dryer side panel. 3 Open the electrical enclosure door. 4 Remove the hose and hose clamp at the bottom of the heater tube. 5 Remove the insulation from the heater tube by cutting the insulation in a straight line from top to bottom. 6 Remove the small 1/8" (3.18 mm) plastic hose from the hose barb, and remove the hose barb.
Replacing the Heaters Regeneration Heater (continued) 12 Put petroleum jelly on the tips of the new heater wire leads to make it easier to go through the holes in the back of the control box. Reference the wiring diagram to re-attach the heater wires and the two snap switch wires. IMPORTANT: The distance the RTD extends into the heater is critical for proper functioning. The distance from the metal heater tube to the outside surface of the curve on the RTD must be 2.5" (63.5 mm) (see photo).
Replacing the Heater Process Heater 1 Disconnect and lockout the main power. 2 Gain access to the process heater by removing the left dryer side panel. 3 Open the electrical enclosure door. Central When configured as a central dryer, there is no process heater in the system. Therefore, replacing the process heater is not applicable. For D15, D25, and D50 Dryers 4 Remove the hose and hose clamp at the bottom of the heater tube.
Replacing the Heater P r o c e s s H e a t e r (continued) 12 Put petroleum jelly on the tips of the new heater wire leads to make it Central When configured as a central dryer, there is no process heater in the system. Therefore, replacing the process heater is not applicable. easier to go through the holes in the back of the control box. Reference the wiring diagram to reattach the heater wires and the two snap switch wires. 13 Put the insulation back on.
R e p l a c i n g t h e D e s i c c a n t Ta n k s The D Carousel Dryer has refillable desiccant tanks. When desiccant becomes clogged or contaminated, you should replace the desiccant in all three tanks to ensure optimum performance, or purchase new, prefilled tanks from Conair. 1 Stop the dryer then disconnect and lockout the main power. 2 Remove the right side panel from the dryer. 3 Disconnect the hose from the desiccant tank. Loosen the hose clamp with a screw driver.
R e f i l l i n g t h e D e s i c c a n t Ta n k s When desiccant becomes clogged or contaminated, you should replace the desiccant in all three tanks to ensure optimum performance. 1 Remove the desiccant tank from the carousel. See “Replacing Desiccant Tanks.” 2 Remove the the tank end plate. Remove the six 10-32 self-tapping screws from the end plate. 3 Remove the screen cap. Remove the two 1/4-20 nuts from the center post and pull the screen cap out. 4 Remove the old desiccant.
R e f i l l i n g t h e D e s i c c a n t Ta n k (continued) 7 Vibrate the tank for 15 minutes. (Important, no further settling can occur.) IMPORTANT: After filling with fresh desiccant, vibrate the tank for at least 15 minutes. 8 Reinstall the screen cap. Place the cap on the band. Install one of the 1/4-20 nuts on the center post and tighten. Do not over-tighten. Install the second 1/420 nut and tighten. 9 Reinstall the tank end plate. Place the end plate on the tank and tighten the six 10-32 screws.
6 - 2 8 l Tr o u b l e s h o o t i n g
We ’ r e H e r e t o H e l p Conair has made the largest investment in customer support in the plastics industry. Our service experts are available to help with any problem you might have installing and operating your equipment. Your Conair sales representative also can help analyze the nature of your problem, assuring that it did not result from misapplication or improper use.
Equipment Guarantee Conair guarantees the machinery and equipment on this order, for a period as defined in the quotation from date of shipment, against defects in material and workmanship under the normal use and service for which it was recommended (except for parts that are typically replaced after normal usage, such as filters, liner plates, etc.). Conair’s guarantee is limited to replacing, at our option, the part or parts determined by us to be defective after examination.
Mounting the Dryer on a Floor Stand Caution: to prevent accident and injury, lift the dryer onto the floor stand using a hoist and lifting lugs provided. 1 Lift the dryer onto the floor stand. Lift using a hoist and the lifting lugs provided. 2 Align the four bolt holes on the bottom of the dryer with the four bolts holes on the top of the floor stand. Tools for installation: ❒ ❒ 3/8” and 9/16” wrench Hoist 3 Bolt the dryer to the stand using the four 5/16”-18 bolts provided.
Mounting the Dryer and Hopper on a Mobile Floor Stand CAUTION: To prevent accident and injury, lift the empty hopper and the dryer onto the mobile floor stand using a hoist and the lifting lugs provided. Tools for installation: ❒ 5/32” Allen wrench ❒ 3/8” and 9/16” wrench ❒ Phillips screwdriver ❒ Flathead screwdriver ❒ Hoist and strap 1 Lift the hopper onto the mobile floor stand using a hoist and the lifting lugs provided.
Mounting the Dryer and Hopper on a M o b i l e F l o o r S t a n d (continued) 2 Bolt the hopper to the mobile floor stand. Using four 3/8”-16 (M 10) self-locking bolts, fasten the hopper to the mobile floor stand. 3 Lift the dryer onto the mobile floor stand using a hoist and lifting lugs provided. 4 Align the four bolt holes on the bottom of the dryer with the four bolts holes in the mobile floor stand stand.
Installing an Aftercooler (Optional) You can add an aftercooler to the D Carousel Dryer by ordering the optional aftercooler assembly. Installation is easy. The optional aftercooler requires a source of city, tower, or chiller water and a discharge or return line. You can use water at temperatures up to 85°F (30°C). But the water flow should be at least 1 gal/min (3.8 liters/min) for models D15, D25, D50; or 2 gal/min (7.6 liters/min) for models D75 and D100. 1 Stop the dryer and lockout the main power.
Installing an Aftercooler (Optional) (continued) 5 Secure the aftercooler assembly in the aftercooler housing using the five screws. ✐ NOTE: If an optional flow control was ordered with the aftercooler, see Appendix E "Optional Flow Control" for information on connecting the water supply. 6 Connect the water supply line to the aftercooler inlet. If a manual shut off valve is used, it should be mounted on the inlet line. 7 Connect the water discharge or return line to the aftercooler outlet.
Cleaning the Aftercooler If you have the optional aftercooler, you need to clean the aftercooler coils to keep them working efficiently. Cleaning frequency depends on the type and amount of material you process. 1 Stop the dryer and lockout the main power. 2 Turn off the water flow to the water supply line. Disconnect supply and return lines. 3 Remove the plastic aftercooler cover.
Cleaning the Aftercooler (continued) 5 Remove the aftercooler assembly from the aftercooler housing. 6 Clean the aftercooler assembly using a mild soap and water. Let the aftercooler dry thoroughly before installation. CAUTION: During the cleaning process, DO NOT cut or remove the stainless steel wire that holds the aftercooler assembly together. 7 Inspect the condition of the gasket. If it is damaged, replace the gasket. 8 Reassemble by repeating the steps in reverse order.
Cleaning the Aftercooler (continued) 9 Connect the water supply line to the aftercooler / precooler inlet. If a manual shut off valve is used, it should be mounted on the inlet line as well. 10 Connect the outlet of the aftercooler / precooler to the inlet of the flow control valve using the pre-shaped copper tubing and compression fittings provided. 11 Install the plastic aftercooler/precooler cover. 12 Turn on the flow control option through your control.
Installing the Flow Control (Optional) You can add optional flow controls to the D Carousel Dryer for use with the optional aftercooler or precooler. Installation is easy. The optional flow control requires a source of city, tower, or chiller water. You can use water at temperatures up to 85°F ( 30°C). But the water flow should be at least 1 gal/min (3.8 liters/min) for models D15, D25, D50; or 2 gal/min (7.6 liters/min) for models D75 and D100. 1 Stop the dryer and lockout the main power.
Installing a Precooler (Optional) You can add a precooler to the D Carousel Dryer by ordering the optional precooler assembly. Installation is easy. The optional precooler requires a source of city, tower, or chiller water and a discharge or return line. You can use water at temperatures up to 85°F ( 30°C). But the water flow should be at least 1 gal/min (3.8 liters/min) for models D15, D25, D50; or 2 gal/min (7.6 liters/min) for models D75 and D100. 1 Stop the dryer and lockout the main power.
Installing a Precooler (Optional) (continued) 7 Connect the water discharge or return line with the pressure relief valve to the precooler outlet. Use the bracket supplied to secure the pressure relief valve and discharge line to the back of the dryer. Precooler installed on a D 15, 25, and 50 dryer without a flow control Precooler installed on a D 75 and 100 dryer without a flow control 8 Install the plastic precooler cap over the water connections.
Cleaning the Precooler If you have the optional precooler, you need to clean the precooler coils to keep them working efficiently. Cleaning frequency depends on the type and amount of material you process. 1 Stop the dryer and lockout the main power. 2 Turn off the water flow to the water supply line. Disconnect supply and return lines. 3 Remove the plastic precooler cover. ✐ ✒ TIP: If the precooler (without a flow control) was installed using the recommended 24 in.
C l e a n i n g t h e P r e c o o l e r (continued) 5 Remove the precooler assembly from the precooler housing. 6 Clean the precooler assembly using a mild soap and water. Let the precooler dry thoroughly before installation. CAUTION: During the cleaning process, DO NOT cut or remove the stainless steel wire that holds the precooler assembly together. 7 Inspect the condition of the gasket. If the gasket is damaged, replace the gasket. 8 Reassemble by repeating the steps in reverse order.
I n s t a l l i n g t h e D e w Po i n t S e n s o r (Optional) ✐ Note: See instructions sent along with your upgrade kit to enable this option. The dew point sensor can be mounted to the inside bottom right corner of the dryer back panel. 1 Peal the tape from the dew point sensor block and place it in the bottom right side of the back panel as shown.
What is the MDC? The MDC is a self-contained, mobile unit designed to dry plastic resin and convey it with dehumidified air directly to a processing machine. This mobile unit contains the: Central • Dehumidifying dryer • Drying hopper and material distribution box • Conveying blower and dust collector • Mobile drying cart • Direct feed vacuum receiver and demand sensor • Quick disconnect conveying hoses When configured as a central dryer, the MDC option is not available.
Ty p i c a l A p p l i c a t i o n s The MDC was designed for drying and conveying beside the press. But it can also be used to pre-dry material in one location, and then transport the dried material to another location for conveying into the processing machine. Central When configured as a central dryer, the MDC option is not available. ✐ NOTE: Throughput rates will vary by MDC model and type of material. See the Specification pages for recommended throughputs.
H o w C o n v e y i n g Wo r k s When the conveying function is turned on, the MDC uses dry air to move material from the drying hopper to the process machine as it is needed. 4 Material enters the vacuum receiver and falls into the receiver and viewing chamber. The blower pulls air through the vacuum receiver filter into the return air conveying line. 1 Dry material drops into the Central When configured as a central dryer, the MDC option is not available.
Specifications: MDC M O B I L E D RY I N G A N D C O N V E Y I N G MDC Small Carousel Models Central When configured as a central dryer, the MDC option is not available. B A C D TLR Tube Loader TLM Tube Loader (dry air conveying) (non-dry air conveying) Outlet - 2 in. dia. {5.1 cm} Inlet - 1.5 in. dia. {3.8 cm} E F Inlet - 1.5 in. dia. {3.8 cm} E - Receiver diameter 4.5 in. {11.4 cm} F - Height with viewing chamber 1 lb. 20.5 in. {52.1 cm} H G G - Receiver diameter 4.5 in. {11.
When configured as a central dryer, the MDC option is not available. S p e c i f i c a t i o n s : M D C (continued) Central Dryer model MDC15 and MDC25 MDC50 MDC75 MDC100 Hopper selection* CH10-1 CH10-1.5 CH14-2 CH14-3 CH14-4 CH18-4 CH18-6 CH24-8 CH24-12 CH24-15 Performance characteristics Air flow {SCFM}† 12 20 35 50 80 Air flow {ACFM @250° } 16 27 47 67 107 Drying temperature‡ All models 100° -375° F {38°-191° C} with options‡ Dew point All models -40° F {-40° C} Maximum conveying distance ft {m} 8 {2.
Unpacking the Boxes The MDC comes fully assembled on a mobile drying cart. You should have received the following components: Vertical conveying tubes Central When configured as a central dryer, the MDC option is not available. Drying hopper RTD probe Direct feed vacuum receiver Viewing chamber and demand sensor Dryer Vacuum receiver mounting bracket Demand sensor cable Pump Material inserts Virgin Dust Collector 1” opening Regrind 1.
Unpacking the Boxes (continued) 3 Carefully inspect all components to make sure no damage occurred during shipping, and that you have all the necessary hardware. 4 Take a moment to record serial numbers and electrical power specifications in the blanks provided on the back of the the User Guide’s title page. The information will be helpful if you ever need service or parts. 5 You are now ready to begin installation.
Preparing for Installation The MDC has been designed for use beside the processing machine. The mobile unit also can be used for pre-drying in a remote location. Central When configured as a central dryer, the MDC option is not available. 1 Make sure the location for the MDC provides: ❒ A grounded power source supplying the correct current for your dryer model. Check the dryer’s serial tag for the correct amps, voltage, phase and cycles.
Installing the MDC The MDC was designed to be mobile. So every time you move the MDC, you will need to mount the vacuum receiver, connect the main power source, and connect a water source for the optional aftercooler. Phasing of electric power should be consistant between locations. Conveying lines Vacuum receiver Demand sensor Central When configured as a central dryer, the MDC option is not available.
Connecting Conveying Lines The vertical conveying tubes and flexible conveying hoses may have been removed for shipping. To assemble: Central When configured as a central dryer, the MDC option is not available. 1.5 in. diameter material conveying hose Vertical conveying tubes 2 in. diameter return air conveying hose Quick disconnect fittings Vacuum receiver 1 Insert each vertical conveying tube into its quick disconnect fitting on the MDC.
C o n n e c t i n g t h e RT D P r o b e See “Connecting the RTD Probe” page 3-16 Connecting the Demand Sensor The capacitive demand sensor monitors the level of material in the viewing chamber of the vacuum receiver when the MDC is conveying. The sensor signals the MDC control to start the conveying blower whenever the level of material drops below the amount that you want to maintain at the feed throat. Central When configured as a central dryer, the MDC option is not available.
Mounting a Loader on the Hopper See “Mounting a Loader on the Hopper” page 3-17 Central When configured as a central dryer, the MDC option is not available.
To S t a r t C o n v e y i n g 1 Move the MDC to the processing machine. Lock the wheels and connect the main power source. Connect the water source if you have an aftercooler. 2 Mount the vacuum receiver on the feed throat. Push the vacuum receiver onto the mounting bracket. Central When configured as a central dryer, the MDC option is not available. 2 3 3 Place the appropriate material insert inside the distribution box. 4 Make sure all hoses are connected 1” opening Virgin material insert 1.
To S t o p C o n v e y i n g 1 Set the load time to zero. Once the load time is set to zero, conveying will stop. See page 4-6, Screen 9 Central Tr a n s p o r t i n g t h e M D C When configured as a central dryer, the MDC option is not available. The MDC can be moved to another processing machine, to a pre-drying area, or to an area away from the processing machine for cleaning and maintenance. To transport safely: 1 Disconnect the power and water sources.
Preventative Maintenance Schedule See “Preventative Maintenance Checklist” page 5-2 Cleaning the Hopper See “Cleaning the Hopper” page 5-3 Central When configured as a central dryer, the MDC option is not available. Cleaning the Conveying Lines This method should be used only after most of the material has been drained from the drying hopper. 1 Disconnect the material line from the loader. 2 Place the disconnected hose inside a container. 3 Turn conveying on by setting the load time above zero.
C l e a n i n g t h e Va c u u m R e c e i v e r The vacuum receiver should be cleaned anytime you change materials. Replace the screen mesh filter if it is torn, damaged, distorted, or so clogged with material that it cannot be cleaned. 1 Turn off the conveying system by setting the load time to zero (See Page 4-6, Screen 9). Disconnect the air and material hoses from the vacuum receiver. Central When configured as a central dryer, the MDC option is not available. 2 Remove the vacuum receiver lid.
Cleaning the Dust Collector The dust collector filters dust and fines from the air used to convey material. The filter should be cleaned regularly to maintain conveying air flow and optimum performance of the conveying blower. 1 Turn off the conveying system by When configured as a central dryer, the MDC option is not available. setting the load time to zero (See Page 4-6, Screen 9). 2 Remove the dust collector lid. Loosen the knob at the base of the lid. CAUTION: Wear eye protection.
Cleaning the Process Filter See “Cleaning the Process Filter” page 5-4 Central When configured as a central dryer, the MDC option is not available.