All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
RAD Oven Series Owner’s Manual PREFACE
Version 1 5
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
ABOUT THIS MANUALRAD Oven Series Owner’s Manual
Before operating this equipment, carefully read instruction
manual.
Values displayed on screens are examples only. Though
those values may be typical, contact Despatch Industries for
the final value.
Users of this equipment must comply with operating
procedures and training of operation personnel as required
by the Occupational Safety and Health Act (OSHA) of 1970,
Section 5 and relevant safety standards, as well as other
safety rules and regulations of state and local governments.
Refer to the relevant safety standards in OSHA and National
Fire Protection Association (NFPA), section 86 of 1985.
All rights reserved. No part of the contents of this manual may be reproduced, copied, or
transmitted in any form or by any means including graphic, electronic, or mechanical methods or
photocopying, recording, or information storage and retrieval systems without the written
permission of the publisher, unless it is for the purchaser's personal use.
Printed and bound in the United States of America.
The information in this manual is subject to change without notice and does not represent a
commitment on the part of Despatch Industries. Despatch Industries does not assume any
responsibility for any errors that may appear in this manual.
In no event will Despatch Industries be liable for technical or editorial omissions made herein,
nor for direct, indirect, special, incidental, or consequential damages resulting from the use or
defect of this manual.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Only fully-trained and qualified personnel should setup and
maintain this equipment. Improper setup and operation of this
equipment could cause an explosion that may result in
equipment damage, personal injury or possible death.
Global Headquarters
Contact
Service & Technical
Support
Despatch Industries
8860 207th Street
Lakeville, MN 55044
USA
International/Main: 1-952-469-5424
US toll free: 1-888-337-7282
Fax: 1-952-469-4513
info@despatch.com
www.despatch.com
Service: 1-952-469-8230
US toll free: 1-800-473-7373
Service @despatch.com
Version 1 7
The information in this document is not intended to cover all possible conditions and situations
that might occur. The end user must exercise caution and common sense when installing or
maintaining Despatch Industries products. If any questions or problems arise, call Despatch
Industries at 1-888-DESPATCH or 1-952-469-5424.
1.2. Manufacturer & Service
The RAD oven series, which includes RAD2-13, RAD2-19 and RAD2-35, is manufactured by
Despatch Industries.
Despatch has specialized in thermal processing for over 100 years. Technical expertise gained
over those years helps provide innovative solutions to critical applications in vertical markets and
cutting edge technology worldwide. Despatch products are backed by a drive for long-term
customer satisfaction and a strong sense of responsibility. The worldwide network of factorytrained Service Professionals is available to support your Despatch equipment. From full service
preventive maintenance to routine repair and certified calibration and uniformity, the Despatch
service network is positioned to respond to your business needs. Our service programs are
customized to meet your specific needs using our Advantage Service Assurance Program
(ASAP). For more information on ASAP, visit www.despatch.com.
1.3. Organization of this Manual
This owner’s manual contains a the most comprehensive set of information for the Despatch
RAD oven series, including installation instructions, theory of operation, and operating
instructions, among other things. To save time and expense in case of trouble, it is urged that the
operators search this manual for helpful suggestions before requesting factory assistance.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Failure to heed warnings in this instruction manual and on the
oven could result in personal injury, property damage or death.
This icon signifies information that describes an unsafe
condition that may result in death, serious injury, or damage to
the equipment.
Danger!
Danger is the signal word used to indicate a hazardous
situation that, if not avoided, will result in death or severe
injury.
Warning!
Warning is the signal word used to indicate a hazardous
situation that, if not avoided, could result in death or severe
injury.
Caution!
Caution is the signal word used to indicate a hazardous
situation that, if not avoided, could result in moderate or minor
injury.
Notice
Notice is the signal word used to indicate a hazardous situation
that, if not avoided, could result in property damage.
This icon signifies supplemental important information.
LOG OUT
Bold, 10 point sans-serif typeface indicates a specific key or
button on screen to click.
8 Version 1
1.4. Conventions
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Control Stability (∆ represents the change in ambient
temperature)
+/- 0.5ºC/5ºC ∆
Repeatability
+/- 0.5ºC
*
Figure 1.
Design
Information
and
Specification
Label.
10 Version 1
1.5.3. Temperatures
Refer to the Design Information and Specification labels on your oven
for temperature specifics pertaining to your oven (Figure 1).
Uniformity figures are based on a nine-point test conducted in an empty oven after stabilization period.
Uniformity can vary slightly depending on unit and operating conditions. Minimum operating temperature
and cooling times are based on 20ºC ambient temperature measured at the fresh air inlet with the fresh air
and exhaust dampers fully open. Specifications are subject to change without notice.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
This oven is not designed for use with flammable material. If
your process involves flammable material, see the RFD Class A
series.
†
‡
Figure 2. Electrical Specification Label.
Version 1 11
1.5.4. Power
Line voltages may vary in some geographies. If the
line voltage for your RAD oven varies more than
10% from the oven voltage rating, electrical
components such as relays and temperature controls
may operate erratically.
If the line voltage is lower than the oven voltage
rating, heat-up time may be significantly longer
and motors may overload or run hot.
If the line voltage is higher than the nameplate
rating, motors may run hot and draw excessive
amperage.
Refer to the Electrical Specifications on your oven
for the specifics pertaining to your oven (Figure 2).
An oven designed for 240 volts (see oven nameplate) will operate satisfactorily on a minimum of 208
Volts, but will result in 25% reduced heater output. If your power characteristic is lower, contact Despatch
Industries.
50 hertz electrical is available on all models.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
An accidental start-up, while working on the RAD oven, can
result in serious injury or death.
Danger!
Electrical panels contain high voltage. Disconnect and lock out
the power supply before working inside any electrical panels.
Failure to lock out the power supply can result in death or injury.
12 Version 1
2. Safety
2.1. Safety Information
Do not work on the RAD oven without reading and understanding this section which contains
important information and warnings. Ignoring these warnings can result in death, serious injury or
damage to the machine and product.
2.1.1. Lockout
Machine lockout places the RAD oven into a zero energy state and prevents accidental machine
start up. Always follow the Lockout Procedure described in this section before cleaning,
maintaining or repairing the RAD oven.
2.1.1.1. Lockout Requirements
1. Every power source that can energize any element of the RAD oven must be shut off at the
closest possible power source. This includes air, water, electricity, and the Disconnect
Switch.
2. After energy sources are locked out, test to ensure circuits are de-energized.
2.1.1.2. Lockout Procedure
Personnel authorized to lockout equipment must have the necessary locks to perform the lockout.
1. Physically disconnect all electrical power to the machine or lockout the appropriate breaker
or disconnects.
2. Close all valves and bleed off any pressure.
3. Test for power by attempting a start with the machine controls.
4. Identify the Lockout Condition with a tag on the electrical disconnect and pneumatic shut off
valve.
5. When work is complete, remove all tags and restore the machine to its working state.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
High voltage present on this equipment, service by authorized
personnel only. Contact with energized electrical sources may
result in serious injury or death.
Danger!
Always disconnect all power before extinguishing a fire.
Attempting to extinguish a fire in a machine connected to
electrical power can result in serious injury or death.
Version 1 13
2.2. Maintenance
Only qualified and trained personnel should perform maintenance or repair.
2.3. Electrical Power
Only qualified and trained personnel should perform electrical maintenance or electrical repair.
Before performing maintenance, disconnect all electrical power from the machine. Use a
padlock and lockout all disconnects feeding power to the machine.
Never clean or repair the oven when in operation.
Unauthorized alterations or modifications to RAD oven are strictly forbidden. Never modify
any electrical circuits. Unauthorized modifications can impair the function and safety of the
RAD oven.
2.4. Fire
Keep the RAD oven clean and free of scrap materials, oil or solvents to prevent the possibility of
fire. In the event of fire, follow these steps.
1. Leave the door as it is.
2. Shut off electricity.
3. De-energize the machine immediately by turning OFF the DISCONNECT SWITCH.
4. Turn off the remote main disconnect (customer supplied disconnect).
5. Shut off fuel.
6. Call the fire department.
7. Stay away.
2.5. Equipment Lockout Requirements
To prevent injury or equipment damage during inspection or repair, the RAD oven must be
locked out.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
The RAD oven has an optional Disconnect Switch (Figure 3). This
Disconnect Switch is connected to the load break switch behind the
panel that disconnects or connects power from the main line. When a
risk of personal injury or damage to the RAD oven exists, turn OFF
the DISCONNECT SWITCH on the front of the oven. This shuts off
all electrical power to the oven.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
RAD Oven Series Owner’s Manual THEORY OF OPERATION
mechanism
Figure 4. RAD Oven Series.
Figure 5. RAD Fresh Air Damper.
Figure 6. RAD Exhaust Damper.
Version 1 15
3. Theory of Operation
3.1. The RAD Oven Series
The RAD ovens (Figure 4) feature horizontal
recirculating airflow to ensure exceptional temperature
uniformity throughout the oven. A high-volume fan
circulates air through perforated, stainless steel walls to
create a constant horizontal airflow across all sections of
the oven. The result is proven reliability in demanding
production and laboratory applications, such as curing,
drying, sterilizing, aging, and other process-critical
applications.
3.2. Damper Control
Fresh air and exhaust dampers (Figure 5 and Figure 6)
control the amount of air exchanged as well as the oven chamber pressure. When the fresh air
damper is closed and the exhaust damper is open, oven chamber pressure tends toward negative.
When the fresh air damper is open and the exhaust damper is closed, the oven chamber pressure
tends toward positive (Table 1).
A negative oven pressure may draw ambient air into any
opening, causing cool spots to occur. The slightly
pressurized chamber produces the effect of pushing air to
the corners of the chamber. However, too much positive
pressure may force hot air or process vapors out of any
openings in the oven into the work area. Ideally, the fresh
air and exhaust dampers should be closed as much as
possible and the oven should be maintained at a neutral or
slightly positive pressure.
Exhaust
damper
control
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Maintain slight positive pressure to regulate heat.
Too much positive pressure in an oven can create a high outer
skin temperature as hot air is forced out through panel joints
and around door seal. High outer skin temperature could warp
the front of the oven.
16 Version 1
Table 1. Damper Positions for Chamber Pressure.
3.2.1. Determining Damper Settings
The optimum setting for the amount of fresh air that should be distributed into the chamber
depends on several factors. These factors include ambient environment temperature, load
conditions, load distribution, heat-up rates, cool-down rates, desired temperature uniformity and,
most importantly, the desired operating temperature. Carefully consider existing engineering
tradeoffs while using guidelines to determine the fresh air damper setting.
In general, the damper should be set so that the amount of fresh air flowing into the chamber
agrees with the desired operating temperature conditions. The following paragraphs show the
considerations involved with various damper position settings.
3.2.1.1. Fresh Air Damper Fully Closed Position
The chamber achieves maximum attainable heat-up rates when the fresh air damper lies in the full
closed position. With the damper in the full closed position, the chamber will operate at the
desired temperature using the minimum amount of power. In most cases, the oven also efficiently
operates at the chamber’s maximum operating temperature when in the full closed position.
3.2.1.2. Fresh Air Damper Fully Open Position
The chamber operates at its minimum operating temperature with the fresh air damper in full
open position.
Friction heat from the air recirculation system builds up in the chamber. This causes chamber
temperature to rise slightly even without the heating system on. The chamber reaches thermal
equilibrium temperature after the recirculation motor runs for an extended period of time.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
RAD Oven Series Owner’s Manual THEORY OF OPERATION
When the damper is in full open position, the oven may not be
able to heat to the maximum oven operating temperature.
This section applies only to ovens that include the optional
adjustable louvers. Ovens without the louver option do not have
adjustable airflow.
Optional adjustable
Version 1 17
The chamber cannot readily dissipate heat generated by friction without a fully open fresh air
damper. With the fresh air damper fully open, the thermal equilibrium temperature is the minimum operating temperature of the chamber.
3.2.1.3. Exhaust Damper Control
Adjusting the exhaust damper (Figure 6) aids in pressurizing the chamber.
3.3. Optional Adjustable Louvers
RAD oven series come standard with perforated supply and exhaust panels (Figure 7).
Optional adjustable louvers provide an extra measure of airflow customization. Figure 8
shows the initial factory settings for the optional louvers.
Standard perforated
panels
louvers
Figure 7. Standard perforated panels and adjustable louvers.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Maintain slight positive pressure to regulate heat.
Too much positive pressure in an oven can create a high outer
skin temperature as hot air is forced out through panel joints
and around door seal. High outer skin temperature could warp
the front of the oven.
18 Version 1
Figure 8. Initial factory settings for optional louvers.
3.3.1. Purpose of Adjustable Airflow
Optional adjustable airflow has several purposes in the RAD oven:
1. Ability to get the best temperature and airflow uniformity.
2. Ability to “spot heat” special areas or specific parts of load.
3. Ability to prevent air flowing out or sucking in through the entrance and exit openings in the
oven.
3.3.2. Supply Air Adjustment
The adjustment of supply louvers is directly related to temperature uniformity in the work
chamber. A general guideline is that more heat is required next to doors, windows and outside
walls so, therefore, more air is required to deliver that heat.
3.3.3. Return Air Adjustment
Ensure there are no restrictive conditions which may limit the amount of air handled by the return
ducts. Restrictions in return air ducts may decrease the amount of air handled by the fan and/or
may result in pressurized conditions in the work chamber. The initial settings for return louvers
should be 50% more open than the supply louvers. Final adjustment may be necessary.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
RAD Oven Series Owner’s Manual THEORY OF OPERATION
The purchaser is responsible for setting the High Limit Control
per the instructions in this manual.
Danger!
Failure to attend to High Limit Control Warning may result in
property damage, serious bodily injury or death.
Notice
It is particularly important that the oven operators have a
practical understanding of the automatic controls. These
regulate the temperature, provide safety features and generally
govern the consistently uniform and satisfactory performance
of the oven.
Version 1 19
3.4. The Protocol 3 Controller
The Protocol 3™ is a microprocessor based digital temperature controller designed for simple
and flexible oven operation (Figure 9). The Protocol 3 controller operates as a dual-functioning
controller/High Limit instrument. The control portion utilizes a time-proportioning voltage signal
to control heating devices with minimal temperature fluctuations.
The High Limit portion protects the product and/or the oven from overheating. If the product
being processed has a critical high temperature limit, the High Limit setpoint should be set to a
temperature somewhat below the temperature at which the product could be damaged. If the
product does not have a critical high temperature limit, the High Limit setpoint should be set 5 to
15 degrees higher than the maximum programmed setpoint at which the oven will operate.
The Protocol 3 controller provides three primary operating modes:
Manual: Oven operates continuously at a fixed temperature until turned off.
Timer: Oven operates at a fixed temperature for a user-selected time period, and then
automatically turns off.
Profile: Temperatures increase or decrease as defined by 255 segments that can be allocated
to 64 ramp and soak profiles. The profiles can be linked to provide additional temperature
combinations.
Review the Protocol 3 Controller Owner’s Manual for more information.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
High Limit audible and visual alarm is a red light and small alarm horn located on the front of the
control panel (Figure 10). The alarm is sounded if a High Limit condition occurs. A switch is
provided to silence the alarm. This alarm has a range of 80dB at 2 ft (0.6 m).
Figure 10. Power, Heat and Alarm Silence Switches.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
This equipment must be installed by a licensed electrician who
is experienced with combustion safeguard control systems and
understands the functions of an interlocking switch such as gas
pressure switches.
If any warning, danger, or information sign has been
damaged or lost, contact the customer service department of
Despatch Industries, Inc. for replacement.
Version 1 21
4. Assembly & Setup
Assembly and Setup provides directions for unpacking and installing your RAD oven.
4.1. Unpack & Inspect The RAD Oven
Remove all packing materials and thoroughly inspect the oven for any damage that might have
occurred during shipment.
Note the condition of the carton and plastic cover sheet inside the carton.
Observe all outside surfaces and corners of the oven for scratches and dents.
Check oven controls and indicators for normal movement, bent shafts, cracks, chips or
missing parts such as knobs and lenses.
Check the door and latch for smooth operation.
4.1.1. If Damaged During Shipping
If damage occurred during shipping:
1. Contact the shipper immediately and file a written damage claim.
2. Contact Despatch Industries (1-800-473-7373 or 1-952-469-8230 or service@despatch.com)
to report your findings and to order replacement parts for those damaged or missing. Send a
copy of your filed damage claims to Despatch Industries (Despatch Industries, 8860 207th
Street, Lakeville, MN 555044, USA).
3. Check the packing list to ensure you received all the specified components of the oven
system. Contact Despatch Industries to have any missing products forwarded to you.
4. Complete the warranty card and mail it to Despatch within 15 days after receipt of the
equipment.
4.2. Set up The RAD Oven
4.2.1. Select Oven Location
The Despatch RAD oven is designed to operate in an industrial setting.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Review oven weight to ensure the foundation is adequate to hold
the weight.
Warning!
Do not use the oven in wet, corrosive or explosive atmospheres
unless this oven is specifically designed for a special
atmosphere.
All stacks must comply with state and local building codes to
insure that surrounding combustible surfaces are below 71°C
(160°F).
Warning!
Do not be careless about restrictions in and around the fresh air
and exhaust openings and stacks.
Notice
Flashing through roof or wall must be capable of handling
temperatures up to 343°C (650°F).
22 Version 1
4.2.1.1. Placement Requirements
Place oven directly on the floor.
Plumb and level the oven to assure proper heat distribution and operation of all mechanical
components.
Do not expose oven to excessive vibration and affix all electrical cabinets.
If placing the oven in an area where excessive particulate matter exists (such as a construction
site or a coal processing center), periodically clean all its electrical compartments. Keep
power supply within the specifications provided by Despatch, and use a line conditioner for a
facility with an unstable power supply.
4.3. Exhaust Connections
The RAD oven exhaust port is located on the top of the oven (Figure 6). Install an exhaust stack
from the discharge opening to the outside of the building. The discharge opening is 17.8 cm (7.0
inches) diameter.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
The oven must be hardwired directly to the electric supply.
Verify proper fan rotation on initial start-up and recheck rotation
whenever wiring or electrical component changes are made.
Each fan has an arrow showing correct rotation.
Danger!
All grounding and safety equipment must be in compliance with
applicable codes, ordinances and accepted safe practices.
Version 1 23
4.3.1. Down Drafts
Where down drafts occur in gravity stacks, their cause should be determined and corrections
made without delay. They can cause concentrations of exhaust volatiles within the work chamber,
poorly baked products, poor burner operation or the spreading of odors into the factory.
Down drafts may result from insufficient gravity stack height, or its failure to extend above
nearby buildings, roofs, pent houses, or other obstructions which cause downward wind
movements into the stack. Such causes are usually easily remedied. Or they may result from a
negative pressure within the factory caused by excessive gravity or forced exhaust ventilation
from the factory. The most effective remedy for this condition is the installation of a “make-up”
supply air system equal in capacity to the total exhaust from the factory.
4.4. Wiring & Power Connections
See electrical schematics in Section 8.3 for line connections.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
In case of fire, leave door(s) as they are. Shut off electricity.
Shut off fuel. Call the fire department. Stay away.
Despatch Industries cannot be responsible for either the
process or process temperature used, or for the quality of the
product being processed. It is the responsibility of the
purchaser and operator to see that the product undergoing
processing in a Despatch oven is adequately protected from
damage.
Carefully following the instructions in this manual will help the
purchaser and operator in fulfilling that responsibility.
Caution!
Always place loads on the shelves provided to avoid possible
uneven heating and damage to the oven.
Users and operators of this oven must comply with operating
procedures and training of operating personnel as required by
the Occupational Safety and Health Act (OSHA) of 1970, Section
5 and relevant safety standards, and other safety rules and
regulations of state and local governments. Refer to the relevant
safety standards in OSHA and National Fire Protection
Association (NFPA), Section 86 of 1985.
24 Version 1
5. Operation
5.1. Load Oven
Avoid spilling on the heater elements or oven floor when loading the oven. Do not place the load
on the oven floor plate. Placing the load on the oven floor may cause the load to heat unevenly
and the weight may cause shorting out of the heater elements. Use the shelves provided.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Do not place the load within 7.62cm (3 inches) of louvers
or within 15.25cm (6 inches) of the chamber ceiling
Stagger the load within the chamber to allow as much air
as possible to circulate from the supply side to the
return side of the oven
Warning!
Do not use flammable solvent or other flammable material in this
oven. Do not process closed containers of any substance or
liquid in this oven because they may explode under heat.
Version 1 25
The two shelves are designed to be pulled out about halfway without tipping. Do not overload the
shelves. Shelf support capacity is listed in the Capacities section (1.5.2). Do not overfill the oven.
Distribute the workload evenly so airflow is not restricted. The workload should not take up more
than two-thirds of any dimension of the inside cavity.
5.2. Pre-Startup Checklist
Read this manual carefully and make use of its instructions and explanations. Safe,
continuous, satisfactory and trouble-free operation depends primarily on your degree of
understanding of the system and your willingness to keep all parts in proper operating
condition.
Verify line voltage. Voltage must correspond to nameplate requirements of motors and
controls. Incorrect line voltage can result in serious damage. Refer to Section 1.5.4 for more
information.
Check fresh air and exhaust openings. Do not be careless about restrictions in and around the
fresh air and exhaust openings and stacks. Refer to Sections 1.5.2 and 4.3 for information on
exhaust specifications and requirements. Under no condition can they be permitted to become
so filled with dirt that they reduce airflow.
For drying applications, open exhaust damper to prevent buildup of moisture.
For sample heating, close the exhaust damper when no ventilation is required.
5.3. Operating Procedure
5.3.1. Check Fan Rotation
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Fans should remain in operation until the oven temperature is below
149ºC (300ºF) to prevent damage to the fan and/or motor bearings.
If polarity is reversed during wiring, the fan will rotate
backwards and compromise proper ventilation.
Never operate oven at a temperature above 343°C (650°F).
26 Version 1
Check fan rotation after the initial installation and after reconnecting the power supply to ensure
fans are running in the correct direction. To check fan rotation:
1. Momentarily toggle POWER (Figure 10) to start fans and check rotation.
2. Rotation should correspond to the directional arrows provided.
3. Reverse motor rotation where necessary.
5.3.2. Start and Operate the Oven
1. Set the main Power Disconnect switch to
ON (Figure 3).
2. Set POWERto ON. The recirculation fan will
start.
3. Turn HEAT to ON (Figure 10).
a. The Heater LED on the controller will light indicate the heater is on and the
controller is calling for heat.
b. The alarm horn will sound if the High Limit trips. Press the ALARM SILENCE to
silence the alarm.
c. Allow the oven to cool below the High Limit setting and reset the High Limit.
4. When the door is opened the heater will shut off.
5. Operate the temperature control as desired. If necessary, refer to the Protocol 3 Owner’s
Manual for more instruction.
5.3.3. Shutdown
1. Set HEAT to OFF.
2. Allow the fans to run until the oven has cooled below 149ºC (300ºF).
3. Set POWER to OFF.
If additional information is required regarding the operation of this equipment, please contact
Despatch.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
International/Main: 1-952-469-5424
US toll free: 1-888-337-7282
Fax: 1-952-469-4513
info@despatch.com
www.despatch.com
Service: 1-952-469-8230
US toll free: 1-800-473-7373
Service @despatch.com
Version 1 27
5.3.4. Working with Protocol 3 Operating Modes
Refer to the Protocol 3 Controller’s Owner Manual for specific information for working
with the controller.
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means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Disconnect all power sources before making repairs. Contact
with energized electrical sources may result in serious injury or
death.
28 Version 1
6. Maintenance
Do not attempt any service on this oven before setting the main power Disconnect Switch to
OFF
6.1. Checklist
Keep equipment clean. Gradual dirt accumulation retards airflow. A dirty oven can result in
unsatisfactory operation such as unbalanced temperature in the work chamber, reduced
heating capacity, reduced production, and the like. Keep the walls, floor and ceiling of the
oven work chamber free of dirt, dust, smoke, solvent vapors, or other contaminations.
Keep all equipment accessible. Allow space for good circulation. Do not permit other
materials to be stored or piled against it.
Do not place load too close to the supply duct. The supply air temperature is somewhat higher
than average work space temperature and may overheat or otherwise damage product.
Do not put product on the floor or in isolated corners where air movement and temperature
are not likely to be at average conditions.
Do not mix thick heavy parts with light parts. The heavy parts require longer to heat and
should be treated separately.
Check safety controls. This should be done daily and never less than once a week.
Establish maintenance and checkup schedules. Maintain equipment in good repair and make
repairs immediately to avoid costly delays.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Visually inspect for
dirt, debris and free
movement of parts
and controls.
X
Clean as needed
X
Inspect door seals
for proper seating,
damage and/or
tears
X
Inspect door
operation. Doors
should open and
close securely,
without jerking or
slamming.
X
Check optional
Disconnect Switch
(2.5.1)
X
Time to temperature:
record heating times
for similar loads. If
heating times are
slowing, it could
indicate a need for
maintenance.
X
Ventilation
Check fresh air
damper (3.2)
X
Check fan vibration:
supply and exhaust
(6.3)
X
Inspect optional
louvers (3.3)
X
Check fan rotation
(5.3.1)
X
Electrical
Check High limit
controller (6.6)
X
Version 1 29
6.2. Maintenance Schedule
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Do not attempt any service on this equipment without setting the
main power Disconnect Switch to OFF. Disconnect all power
sources before making repairs. Contact with energized electrical
sources may result in serious injury or death.
30 Version 1
6.3. Check Fans
Check fan operation by closely observing for abnormal movement or sound. Irregular noise or
movement may mean the fan needs repair or replacement. Listen for any irregular noises
coming from the fans.
6.4. Lubrication
Lubricate all door latches, hinges, door operating mechanisms, and wear surfaces to ensure easy
operation.
6.5. Check Safety Controls
Make certain the oven controls are free of dirt and debris and function properly.
6.6. Check High-Limit Controller
The Protocol 3 controller has an integrated high limit function which disables the heater output
when tripped. Check the High Limit controller by:
1. Set the Hi-Limit setpoint below the process temperature. Refer to the Protocol 3 manual as
necessary.
2. The oven should heat and trip the High-Limit controller as it reaches the high limit setpoint.
3. If not, contact Despatch.
6.7. Replacement Parts
Contact the Service Products Division at Despatch to order or return parts. The Service Products
features our Response Center for customer service. A Despatch representative will provide you
with an MRA (Material Return Authorization) number that must be attached to the returned part
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
International/Main: 1-952-469-5424
US toll free: 1-888-337-7282
Fax: 1-952-469-4513
info@despatch.com
www.despatch.com
Service: 1-952-469-8230
US toll free: 1-800-473-7373
Service @despatch.com
Version 1 31
for identification. When ordering a replacement part, be sure to give the model number, serial
number, and part number to expedite the process.
Contact Despatch with any service needs.
6.8. Repairs
6.8.1. Protocol 3 Controller
Refer to the Protocol 3 Owner’s Manual for instructions on replacing the Protocol 3 Controller.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Disconnect power and check connections behind control panel
Heater relay failure
Replace heater contactor or SCR
Door switch failure (if
installed)
Replace door switch
Slow heat up
Improperly loaded
Reduce load or redistribute load in chamber.
Low line voltage
Supply sufficient power and proper
connections. Check for circuit overload
Heating element(s) are
burned out
Replace heater (see warranty, Section 8.1)
Fan motor failure
Replace fan motor
Frequent heater
element burnout
Harmful fumes generated
by load
Increase vent opening or discontinue process
Spillage or splattering of
material on heater
elements
Disconnect power and clean oven chamber.
Take measures to prevent splattering.
Overheating oven
Check the High Limit
Erratic temperature
or
inaccurate
temperature
Protocol 3 controller
malfunction
Replace controller
Improper tuning
parameters
Check tuning parameters
Protocol 3 controller
miscalibration
Recalibrate controller (see Protocol 3
Controller Owner’s Manual for further
instruction manual).
High Limit setting
High Limit should be 10-25ºC higher than
setpoint.
Defective SCR
Replace SCR
Improper offset
Check zone calibration
Excess surface or
door temperature
Door seal deterioration
Replace door seal.
Improper airflow
Fan motor failure
Replace fan motor
32 Version 1
7. Troubleshooting
7.1. Possible Problems and Suggested Solutions
Equipment which operates for long periods of time may develop problems. Table 2 lists possible
problems and suggested solutions. If you have a problem not listed and do not know what to do,
contact Despatch Industries at our toll free Help Line 800-473-7373.
Table 2. Troubleshooting grid.
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means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
Adjust fan wheel for 3/16" clearance between
wheel and inlet ring
Unbalanced fan wheel
Replace fan wheel
Excessive vibration
Dirty fan wheel
Clean fan
Unbalanced fan wheel
Replace fan wheel
Oven will not
control at setpoint
High Limit set too low
Set the High Limit higher.
Protocol 3 controller
malfunction
Replace controller
SCR malfunction
Replace SCR and/or check control output
voltage.
Air friction of recirculation
fan
Open exhaust air vent. Unit will not control
below minimum operating temperature with
vent closed.
Heater does not
shut down until
temperature
reaches the High
Limit setting
Protocol 3 controller
malfunction
Replace controller.
SCR malfunction
Replace SCR
Danger!
Electrical panels contain high voltage. Disconnect and lock out
the power supply before working inside any electrical panels.
Failure to lock out the power supply can result in death or injury.
Version 1 33
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
1.Check to get a lightly positive chamber pressure by closing down
exhaust or opening up fresh air.
a. Review damper instructions (Section 3.2)
b. Adjust optional supply louvers:
i. Open for cold spots
ii. Close for hot spots
c. If necessary, adjust optional return louvers in the same
manner.
2.Check motor for proper operation and direction of rotation.
B. Cold by door
1. See A-1.
2. Check door seals.
3. Open optional supply louvers close to door.
C. Positive pressure in
chamber
1. Close fresh air damper.
2. Open exhaust damper.
3. Refer to Damper Control Section 3.2 for more information.
D. Negative pressure
in chamber
1. Close exhaust damper.
2. Open fresh air damper.
3. Open optional supply louvers slightly.
Alarm Status
Possible Problem
Next Step
HI LIMIT LED ON
Problem with thermocouple
High Limit setpoint has
been exceeded.
Once the problem has corrected, press
RESET.
DEV HOLD LED flashing
Oven temperature has not
entered (or dropped out of) the
Auto Hold band and the soak
timer has stopped
Program a slower ramp rate or if oven
is not heating check heater circuit.
Top PV displays OPEN
Control thermocouple is
disconnected or broken
Repair or replace the thermocouple.
HLPV displays OPEN
High Limit thermocouple is
disconnected or broken
Repair or replace the thermocouple.
34 Version 1
7.2. Troubleshoot Airflow Conditions
Table 3 lists possible problems and remedies for airflow conditions.
Table 3. Airflow Troubleshooting.
7.3. Troubleshooting: Error Messages and Alarm
Table 4 lists the more common error messages, the possible problems and remedies.
Table 4. Error Messages and Next Steps.
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means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
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APPENDICESRAD Oven Series Owner’s Manual
Refer to instructions provided recorder manufacturer for more
specific installation notes.
Parameter Code
Degrees C
Degrees F
Inps
17
17
Icor 0 0
diSP
On
On
dPOS
0
0
EUU4
400
752
EUL4
0
32
ChUP
400
8005
ChLO
0 0 DFF
1
1
4
5
36 Version 1
8.2. MRC5000 Setup (Optional)
Temperature is retransmitted to the MRC5000 recorder from the controller. Set up the recorder
by:
1. Ensure hardware jumper JU1 is in place for the 5 VDC setting (Refer to MRC5000 Manual
included).
2. Move MODE to PROG/TEST/CALto display Prog.
3. Press ▼ twice to display Inps. Move to each Parameter Code using ▼or ▲. Adjust each
Parameter Code using the settings in Table 5.
4. After adjusting all settings, move MODE to RUN. Display on both the recorder and controller
should read the same.
Table 5. MRC 5000 Settings.
8.3. Schematics
The following pages contain electrical and mechanical schematics for the RAD2-13, 2-19 and 235 ovens.
These values must match the settings RetOutLo and RetOutHi on the Protocol 3 Control page. For
example, if RetOutLo is 32, EUL must read 32.
Change 0-400 chart paper to 0-800 chart paper. Depending on the equipment used, 0-600 paper may be
used if the maximum temperature is 260°C (500°F).
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means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any means including graphic, electronic, or mechanical methods
or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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or photocopying, recording, or information storage and retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
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