Nordson SCH-1 User manual

Model SCH-1 Heater
Customer Product Manual
Part 108 151D
NORDSON CORPORATION DAMHERST, OHIO DUSA

E1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
Nordson Corporation welcomes requests for information, comments and inquiries about its products. General
information about Nordson can be found on the Internet using the following address: http://www.nordson.com.
Address all correspondence to:
Nordson Corporation
Attn: Customer Service
555 Jackson Street
Amherst, OH 44001
Notice
This is a Nordson Corporation publication which is protected by copyright. Original copyright date 1991. No part of
this document may be photocopied, reproduced, or translated to another language without the prior written consent
of Nordson Corporation. The information contained in this publication is subject to change without notice.
Trademarks
Blue Box, Can Works, Century, CleanSleeve, CleanSpray, Control Coat, Cross-Cut, Easy Coat, Econo-Coat, Excel
2000, Flow Sentry, FoamMix, Horizon, Hot Shot, Isocoil, Isocore, Iso-Flo, MEG, Nordson, the Nordson logo,
Package of Values, PowderGrid, Pro-Flo, PRX, RBX, Ready Coat, Rhino, SCF, Select Coat, Select Cure, Shur-Lok,
Smart-Coat, System Sentry, Tribomatic, Versa-Coat, Versa-Screen, and Versa-Spray
are registered trademarks of Nordson Corporation.
Accu-Jet, Auto-Flo, CanNeck, Clean Coat, CPX, EasyClean, Ink-Dot, OptiMix, PowderGrid, Pulse-Spray, Sure
Coat, Swirlcoat and Walcom are trademarks of Nordson Corporation.

Table of Contents
i
E1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
Table of Contents
1. Safety 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Qualified Personnel 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intended Use 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Regulations and Approvals 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Personal Safety 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Pressure Fluids 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fire Safety 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogenated Hydrocarbon Solvent Hazards 5. . . . . . . . . . . . . . . .
Action in the Event of a Malfunction 5. . . . . . . . . . . . . . . . . . . . . . . . .
Disposal 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Description 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Heater 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Temperature Controller 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Lines and Fittings 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Operation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressurizing the System 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting the Heater 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Temperature Controller 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shutdown 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Troubleshooting 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Repair 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Limiter 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Limiter Removal 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Limiter Installation 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii
E1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
Heater Cartridge 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Cartridge Removal 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Cartridge Installation. 17. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Heating Reservoir 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Heating Reservoir Removal 18. . . . . . . . . . . . . . . . . . . . . . . .
Fluid Heating Reservoir Installation 19. . . . . . . . . . . . . . . . . . . . . .
Fluid Passage Body 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Passage Body 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Passage Body Installation 20. . . . . . . . . . . . . . . . . . . . . . . . .
8. Parts 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Illustrated Parts List 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCH-1 Heater Assembly 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Limiter Kit 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater Seal Kit 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCH-1 Heater Disassembly Tool Kit 25. . . . . . . . . . . . . . . . . . . . . . . .
9. Specifications 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Watts 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amperes 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Operating Pressure 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hose Fitting Size (inlet – outlet) 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Capacity 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Range (Minimum/Maximum) 26. . . . . . . . . . . . . . . . . . .
10. Model SCH-1 Heater Disassembly Tool Kit 27. . . . . . . . . . . . . . . . . . . .
Disassembly 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing for Disassembly 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Disassembly Tool Kit 28. . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model SCH-1 Heater
1
E1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
Model SCH-1 Heater
Read and follow these safety instructions. Task- and equipment-specific
warnings, cautions, and instructions are included in equipment
documentation where appropriate.
Make sure all equipment documentation, including these instructions, is
accessible to persons operating or servicing equipment.
Equipment owners are responsible for making sure that Nordson
equipment is installed, operated, and serviced by qualified personnel.
Qualified personnel are those employees or contractors who are trained
to safely perform their assigned tasks. They are familiar with all relevant
safety rules and regulations and are physically capable of performing
their assigned tasks.
Use of Nordson equipment in ways other than those described in the
documentation supplied with the equipment may result in injury to
persons or damage to property.
Some examples of unintended use of equipment include
Susing incompatible materials
Smaking unauthorized modifications
Sremoving or bypassing safety guards or interlocks
Susing incompatible or damaged parts
Susing unapproved auxiliary equipment
Soperating equipment in excess of maximum ratings
Make sure all equipment is rated and approved for the environment in
which it is used. Any approvals obtained for Nordson equipment will be
voided if instructions for installation, operation, and service are not
followed.
1. Safety
Qualified Personnel
Intended Use
Regulations and Approvals

Model SCH-1 Heater
2
E1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
To prevent injury follow these instructions.
SDo not operate or service equipment unless you are qualified.
SDo not operate equipment unless safety guards, doors, or covers are
intact and automatic interlocks are operating properly. Do not bypass
or disarm any safety devices.
SKeep clear of moving equipment. Before adjusting or servicing
moving equipment, shut off the power supply and wait until the
equipment comes to a complete stop. Lock out power and secure the
equipment to prevent unexpected movement.
SRelieve (bleed off) hydraulic and pneumatic pressure before adjusting
or servicing pressurized systems or components. Disconnect, lock
out, and tag switches before servicing electrical equipment.
SWhile operating manual spray guns, make sure you are grounded.
Wear electrically conductive gloves or a grounding strap connected to
the gun handle or other true earth ground. Do not wear or carry
metallic objects such as jewelry or tools.
SIf you receive even a slight electrical shock, shut down all electrical or
electrostatic equipment immediately. Do not restart the equipment
until the problem has been identified and corrected.
SObtain and read Material Safety Data Sheets (MSDS) for all materials
used. Follow the manufacturer’s instructions for safe handling and
use of materials, and use recommended personal protection devices.
SMake sure the spray area is adequately ventilated.
STo prevent injury, be aware of less-obvious dangers in the workplace
that often cannot be completely eliminated, such as hot surfaces,
sharp edges, energized electrical circuits, and moving parts that
cannot be enclosed or otherwise guarded for practical reasons.
Personal Safety

Model SCH-1 Heater
3
E1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
High-Pressure Fluids
High-pressure fluids, unless they are safely contained, are extremely
hazardous. Always relieve fluid pressure before adjusting or servicing
high pressure equipment. A jet of high-pressure fluid can cut like a knife
and cause serious bodily injury, amputation, or death. Fluids penetrating
the skin can also cause toxic poisoning.
If you suffer a fluid injection injury, seek medical care immediately. If
possible, provide a copy of the MSDS for the injected fluid to the health
care provider.
The National Spray Equipment Manufacturers Association has created a
wallet card that you should carry when you are operating high-pressure
spray equipment. These cards are supplied with your equipment. The
following is the text of this card:
WARNING: Any injury caused by high pressure liquid can be
serious. If you are injured or even suspect an injury:
SGo to an emergency room immediately.
STell the doctor that you suspect an injection injury.
SShow him this card.
STell him what kind of material you were spraying.
MEDICAL ALERT—AIRLESS SPRAY WOUNDS: NOTE TO PHYSICIAN
Injection in the skin is a serious traumatic injury. It is important to treat
the injury surgically as soon as possible. Do not delay treatment to
research toxicity. Toxicity is a concern with some exotic coatings injected
directly into the bloodstream.
Consultation with a plastic surgeon or a reconstructive hand surgeon may
be advisable.
The seriousness of the wound depends on where the injury is on the
body, whether the substance hit something on its way in and deflected
causing more damage, and many other variables including skin
microflora residing in the paint or gun which are blasted into the wound.
If the injected paint contains acrylic latex and titanium dioxide that
damage the tissue’s resistance to infection, bacterial growth will flourish.
The treatment that doctors recommend for an injection injury to the hand
includes immediate decompression of the closed vascular compartments
of the hand to release the underlying tissue distended by the injected
paint, judicious wound debridement, and immediate antibiotic treatment.

Model SCH-1 Heater
4
E1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
To avoid a fire or explosion, follow these instructions.
SGround all conductive equipment in the spray area. Use only
grounded air and fluid hoses. Check equipment and workpiece
grounding devices regularly. Resistance to ground must not exceed
one megohm.
SShut down all equipment immediately if you notice static sparking or
arcing. Do not restart the equipment until the cause has been
identified and corrected.
SDo not smoke, weld, grind, or use open flames where flammable
materials are being used or stored.
SDo not heat materials to temperatures above those recommended by
the manufacturer. Make sure heat monitoring and limiting devices are
working properly.
SProvide adequate ventilation to prevent dangerous concentrations of
volatile particles or vapors. Refer to local codes or your material
MSDS for guidance.
SDo not disconnect live electrical circuits while working with flammable
materials. Shut off power at a disconnect switch first to prevent
sparking.
SKnow where emergency stop buttons, shutoff valves, and fire
extinguishers are located. If a fire starts in a spray booth,
immediately shut off the spray system and exhaust fans.
SShut off electrostatic power and ground the charging system before
adjusting, cleaning, or repairing electrostatic equipment.
SClean, maintain, test, and repair equipment according to the
instructions in your equipment documentation.
SUse only replacement parts that are designed for use with original
equipment. Contact your Nordson representative for parts
information and advice.
Fire Safety

Model SCH-1 Heater
5
E1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
Halogenated Hydrocarbon Solvent Hazards
Do not use halogenated hydrocarbon solvents in a pressurized system
that contains aluminum components. Under pressure, these solvents
can react with aluminum and explode, causing injury, death, or property
damage. Halogenated hydrocarbon solvents contain one or more of the
following elements:
Element Symbol Prefix
Fluorine F “Fluoro-”
Chlorine Cl “Chloro-”
Bromine Br “Bromo-”
Iodine I “Iodo-”
Check your material MSDS or contact your material supplier for more
information. If you must use halogenated hydrocarbon solvents, contact
your Nordson representative for information about compatible Nordson
components.
If a system or any equipment in a system malfunctions, shut off the
system immediately and perform the following steps:
SDisconnect and lock out system electrical power. Close hydraulic and
pneumatic shutoff valves and relieve pressures.
SIdentify the reason for the malfunction and correct it before restarting
the system.
Dispose of equipment and materials used in operation and servicing
according to local codes.
Action in the Event of a
Malfunction
Disposal

Model SCH-1 Heater
6
1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
See Figure 1. The Nordson SCH-1 heater is an electrically operated,
digitally controlled high-pressure fluid heater designed for use with the
Select Coat system. Maximum operating pressure is 241 bar (3500 psi),
although the Select Coat system requires much lower operating
pressures below 5.9 bar (85 psi).
The heater can raise an ambient material temperature of 18.3 °C (65 °F)
to 83 °C (190 °F). Refer to
Specifications for more information.
The standard SCH-1 heater has an electroless nickel-plated brass
reservoir and fluid passage body (4). The heater is mounted at the back
of the workcell, near the fluid pump and consists of an electrical
enclosure (5) and a fluid-heating reservoir.
A platinum RTD is used to provide temperature feedback from the fluid
passage body to an adjustable digital temperature controller at the front
of the workcell. The fluid heating reservoir consists of a fluid passage
body and high-pressure housing (3). The heater cartridge and heat
limiter are located within the fluid passage body.
1211001A
5
4
3
1
2
Fig. 1 SCH-1 Heater
1. Fluid outlet port
2. Fluid inlet port
3. High pressure housing
4. Fluid passage body
5. Electrical enclosure
2. Description

Model SCH-1 Heater
7
1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
The following paragraphs describe the operation of the SCH-1 heater.
The Heater
See Figure 2. Fluid enters the input port and flows into the fluid passage
body (2) within the fluid-heating reservoir. The heater cartridge (3) heats
the fluid passage body, which is spiral grooved. As fluid flows along the
spiral groove it is heated and exits the fluid passage body through the
outlet port.
1211002A
5
42
3
1
Fig. 2 SCH-1 Heater Cutaway
1. RTD sensor
2. Fluid passage body
3. Heater cartridge
4. High pressure housing
5. Heat limiter
The temperature is controller by the digital controller, acting on feedback
from the RTD sensor (1). If the temperature controller fails, it will shut
itself and the heater down. If the RTD fails, or another problem causes
an over-temperature condition, the heat limiter (5) will sense the excess
heat and open the circuit to the heater cartridge, shutting down the
heater.
Theory of Operation

Model SCH-1 Heater
8
1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
Digital Temperature Controller
The Select Coat Workcell is equipped with a digital temperature
controller. The digital temperature controller monitors and controls heater
output. It is electrically connected to a RTD in the fluid passage body.
Refer to
Operation for a description of the various LEDs and keys on the
temperature controller.
Use the following information to install the SCH-1 heater.
WARNING: Allow only qualified personnel to perform the
following tasks. Follow the safety instructions in this document
and all other related documentation.
Make sure the heater is securely mounted in an upright, vertical position
on the workcell.
WARNING: Prevent electrical shock during installation or
servicing by installing a power isolation device such as a
breaker or disconnect in the service line ahead of the heater.
1.See Figure 3. Route the supply wiring into the electrical enclosure
and connect electrical wire leads L1 (Power) and L2 (Neutral) at the
terminal block. The terminal block is permanently marked with wire
designations.
2.Install a ground wire to the electrical enclosure internal ground stud.
3.Wire the temperature controller and thermocouple as shown in
Figure4.
4.Install a ground cable to external ground stud and clamp to a true
earth ground.
3. Installation
Mounting
Electrical

Model SCH-1 Heater
9
1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
1211003A
Fig. 3 Heater Wiring
1211004A
ALARM
50/60Hz 7VA
100 TO 240VAC
1A 250VAC
RELAY
SOLID STATE
PLATINUM RTD
B
2
7
3
+
OPTO22
120D10
USED
NOT
A
6
+
1
4
9
12VDC
20mA
B
3
8
–
PUT
OUT
4
2
–
SSR2
115VAC 60Hz 1
L1
L2
500 W
115 VAC
HTR.
SCH1
TEMPERATURE CONTROLLER
5
10
L1
HEATER
SCH1
L2
1
Fig. 4 Heater Wiring Diagram

Model SCH-1 Heater
10
E1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
See Figure 1. Procedures for connecting fluid lines and fittings are
provided in the following steps.
CAUTION: The heater inlet and outlet fittings use O-ring seals
which form a leak-proof hydraulic seal if tightened properly. To
prevent damage to seals, do not over-tighten fittings.
NOTE: Inlet and outlet fittings are 3/8-in. NPT.
1.Install a fluid inlet fitting into the fluid inlet port (2). Tighten the fluid
inlet fitting to 2.08 kgm (15-ft-lb).
2.Install a fluid outlet fitting into the fluid outlet port (1). Tighten the fluid
outlet fitting to 2.08 kgm (15-ft-lb).
3.Install the fluid line from the pump to the heater fluid inlet fitting.
This section covers safety precautions and heater operation procedures.
Before operating a system equipped with a heater, system operators
should read all related component manuals that make up the system and
be familiar with safety precautions and operating characteristics of each
component. A thorough understanding of the system operation will help
obtain desired results and aid in troubleshooting.
Refer to
Safety for additional safety precautions.
WARNING: Make sure all equipment in the coating area is
properly grounded. Periodically check grounds. Sparks can
result from poor grounds and can cause fire or explosions.
WARNING: Inspect and maintain fire detection systems and
interlocks daily.
NOTE: The SCH-1 Heater is primarily used with the Select Coat system.
If you are using this heater with another system, contact your Nordson
representative for operation procedures.
Follow these procedures to startup your SCH-1 Heater.
SMake sure the heater is securely connected to a true earth ground.
SMake sure all heater fittings and fluid delivery system fittings are
tightened securely before activating the fluid pump.
SPressurize the fluid delivery system.
Fluid Lines and Fittings
4. Operation
Start-Up

Model SCH-1 Heater
11
1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
Pressurizing the System
WARNING: Do not operate the heater until the fluid delivery
system is fully pressurized and circulating. If fluid does not
circulate properly, heat can build up and may cause solvents to
flash to vapor. This could result in an explosion.
NOTE: Refer to the
Select Coat Heated Circulating Fluid Delivery
Systems manual for additional information on operating the fluid delivery
system.
1. See Figures 5 and 6. Pressurize the fluid delivery system by pressing
the upper Air button on the front panel of the workcell or the Start
button on the front panel of the conveyorized workcell.
1211005A
Fluid Pressure
Robot Rdy
Vent Air
Part In Place
Door Ajar
Fluid Level
Option 1
Option 2
Power Air Gun Heat
Emergency
Stop
1
0
Fig. 5 Workcell Front Panel
1211006A
Emergency
Stop 01
Start Pause
Purge Fill
Robot Ready
N.R.F.P.
CompAir
Conveyor
Oven
Fluid
Interlock Film
Coater
Fluid Pressure
Fig. 6 Conveyorized Workcell Front Panel

Model SCH-1 Heater
12
1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
Pressurizing the System (contd)
2.Set the air regulator to 1.4 bar (20 psi).
3.See the fluid pressure regulator on the front panel to 0.7 bar (10 psi).
4.Move the air directional valve to the forward position.
At this point you should hear the air motor for the circulating pump
begin to run. The circulating pump is attempting to pump fluid from
the fluid reservoir into the fluid system.
In 1–2 minute(s) you will hear a change in the pitch of the motor as it
begins to slow. Let the motor run one-minute longer. The system
should now be full of fluid and purged of air.
5.Turn the three-way dump valve to the horizontal position to stop the
material flow to the fluid reservoir.
6.Turn the three-way recirculation valve so it is pointing to the left. This
will circulate the material to the gear pump.
Starting the Heater
WARNING: Before applying power to the heater, make sure all
conductive objects in the coating area are properly grounded.
Electrical sparks discharged from ungrounded conductive
objects may start fires or cause explosions.
1.See Figures 5 and 6. Apply power to the heater by pressing the Heat
button on the front panel of a workcell or using the rear-mounted
switch on the back on the conveyorized workcell.
2.Allow fluid temperature to stabilize.
3.If the digital controller is not indicating the desired temperature, refer
to
Troubleshooting for more information.

Model SCH-1 Heater
13
1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
See Figure 7 for an illustration and Refer to Table 1 and description of the
digital display.
Fluid Pressure
Robot Rdy
Vent Air
Part In Place
Door Ajar
Fluid Level
Option 1
Option 2
Power Air Gun Heat
Emergency
Stop
1
0
1211007A
6
3
21
8
5 4
7
Fig. 7 Digital Temperature Controller
Table 1 Digital Display Functions
Item Description Function
1Digital display Displays all heater functions (temperature, temperature setpoint,
alarms)
2Output Operation Indicator Illuminates when the control output is on.
3Alarm Output operation Indictor Illuminates when an alarm is triggered.
4Upward Setting Key Increases the temperature setting/alarm on the display.
5Downward Setting Key Decreases the temperature setting/alarm on the display.
6Mode Setting Key Switches the heater’s mode between the Current Temperature,
Temperature Setpoint, or Alarm.
7Mode Indicator Indicates heater’s current mode. (Alarm and Setpoint)
8LED Deviation Indicator Indicates when you are above or below the setpoint.
Digital Temperature
Controller

Model SCH-1 Heater
14
1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
Follow these steps to shutdown the SCH-1 heater
1. Remove power from the heater 10–15 minutes before shutting down
the system by pressing the Heat button on the front panel of the
workcell or using the rear-mounted switch on the conveyorized
workcell.
2. Allow fluid to circulate through the heater while it is cooling down.
3. Shut down the system. Refer to the
Select Coat Heated Circulating
Fluid Delivery Systems manual for shutdown procedures.
WARNING: Use appropriate respiratory and skin protection
when using coating materials and solvents. Obtain and read
the Material Safety and Data Sheets from the manufacturer
before use, and follow the manufacture’s recommended
handling and disposal procedures.
1. Remove coating material with a solvent soaked cloth. Do not soak
and component. O-rings maybe affected by some solvents.
2. Make sure fittings are tightened securely.
3. Make sure the heater is grounded.
4. Leave a compatible solvent in the heater when it is not in use.
Shutdown
5. Maintenance

Model SCH-1 Heater
15
1999 Nordson Corporation
All rights reserved 108 151D
Issued 8/99 Manual 12-11
WARNING: Allow only qualified personnel to perform the
following tasks. Follow the safety instructions in this document
and all other related documentation.
This section contains troubleshooting procedures. These procedures
cover only the most common problems that you may encounter. If you
cannot solve the problem with the information given here, contact your
local Nordson representative for help.
Problem Possible Cause Corrective Action
1. Insufficient heat at
application Poor material circulation Check the fluid filter. Clean if necessary. If heat is still insufficient, reassemble the
heater and repeat heater startup. Refer
to
Operation .
Coating material baked on the inside
of the fluid passage body Disassemble the heater and clean the fluid passage body. Refer to Repair for
procedures.
2. No heat output RTD failure Replace the RTD.
Digital temperature controller failure Replace the digital controller. Contact
your Nordson representative.
Blown fuse on workcell Replace the fuse. Refer to the
appropriate Select Coat system manual.
Heater cartridge failure Refer to Repair. Disconnect heater
cartridge leads 2 and L2 from terminal
block. Check for continuity between
heater cartridge leads 2 and L2. If
continuity is not present, replace the
heater cartridge.
Heat limiter is open Check the continuity with a meter.
Replace the heater limiter if open. Refer
to Repair.
3. Low fluid output Clogged fluid filter Check the fluid filter and clean if
necessary.
Clogged fluid passages Disassemble the heater and clean the
fluid passage body.
6. Troubleshooting

Model SCH-1 Heater
16
1999 Nordson Corporation
All rights reserved
108 151D
Issued 8/99
Manual 12-11
The following paragraphs provide procedures for disassembly, repair and
assembly of the SCH-1 heater. These procedures should be performed
by qualified personnel observing standard safety practices.
WARNING: Remove power, relieve fluid and air pressure, and
allow heater to cool down before performing any maintenance.
Failure to observe this warning may cause serious injury to
personnel and/or damage to equipment.
See Figure 2.
Heat Limiter Removal
1.Remove the six-socket head cap screw and lockwashers securing the
cover to the heater. Remove the cover.
2.Disconnect the lead wired L1 and 1 from the heat limiter.
3.Carefully pull the heat limiter (5) out of the fluid passage body.
Heat Limiter Installation
1.Install the heat limiter (5) into the fluid passage body.
2.Connect lead wired L1 and 1 to the heat limiter
3.Replace the heater cover.
7. Repair
Heat Limiter