Nordson A-1 Series User manual

--
A-l Handgun
Part 108 061 D
NORDSON CORPORATION l AMHERST, OHIO l USA

Nor&on Corporation welcomes requests for information, comments and inquiries about its products.
Address all correspondence to
Nordson Corporation
555 Jackson Street
Amherst, OH 44001
Notice
This is a No&on Corporation pubtication which is protected by copyright. Original copyright date 1990. 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
100 Plus, Blue Box, ChromaFlex, CleanSleeve, CleanSpray, Control Coat, Cross-Cut, Easy Coat, Econo-Coat,
Flo-Tracker, Flow Sentry, FoamMix, Isocoil, Isocore, Iso-Flo, Nordson, the Nordson logo, PRX, Pro-Flo, RBX,
Ready-Coat, Rhino, Select Coat, Shur-Lok, Smart Spray, System Sentry, Thread Coat, Tribomatic, and
Versa-Spray are registered trademarks of Nordson Corporation.
CPX, CanWorks, Excel 2000, Fio-Tracker, Horizon, PowderGrid, Pulse Spray, SCF, Select Cure, Versa-Coat,
Versa Screen, and Package of Values are trademarks of No&on Corporation.
Teflon and Viton are registered trademarks of E.I. DuPont de Nemours & Co.
Loctite is a registered trademark of Loctite Corporation.
Manual26-4 108 061D
Issued 3/93 0 1993 F&&on Cotporatkm
All Riils l%esefved

A-l HANDGUN MANUAL NO. 26-4
Page O-3
TABLE OF CONTENTS
SECTION PAGE
SECTION 1
SAFETY SUMMARY
Introduction ........................... l- 1
Explanation Of Terms And Symbols ................. l-l
Safety During Installation .................... .l-2
Electrical ........................... l-2
Pneumatic ......................... .l-2
Gas System Installation
(FoamMelt@ applicators and nitrogen blanket kits only) ...... l-2
Safety During Operation ..................... l-2
Safety During Servicing ...................... l-3
Safety When Using Hot Melt Adhesives, Sealants
Solvents, And Reactive Materials .................. l-4
Halogenated Solvents .................... .l-5
Reactive Materials ....................... l-5
If Molten Material Comes In contact With The Skin .......... l-6
SECTION 2
EQUIPMENT FAMILIARIZATION
Description . . . . . . . . . . . . . . . . . . . . . . . . . . .2-l
Optional Nozzles and Hoses . . . . . . . . . . . . . . . . . . .2-2
Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . .2-2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
SECTION 3
INSTALLATION
Unpacking ........................... .3-l
Inspection ........................... .3-l
Safety Precautions ....................... .3- 1
Circuit Breaker Retrofit Kits ................... .3-l
Installation .......................... .3-2
SECTION 4
OPERATION
Setup And Initial Operation ................... .4-l
Adjustment .......................... .4-2
Increase Deposition ..................... .4-2
Decrease Deposition ..................... .4-2
System Shutdown ....................... .4-2
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3193

MANUAL NO. 26-4
Page O-4 A-l I-IANDGUN
SECTION PAGE
SECTION 5
PREVENTIVE MAINTENANCE
Gun Cleaning ......................... .5- 1
Daily ............................ .5-l
Weekly ........................... .5-l
Gun Inspection ......................... .5-l
Semiannually ........................ .5-l
Swivel Connector Thrust Bearing Lubrication ........... .5-2
Semiannually ........................ .5-2
Nozzle Cleaning ........................ .5-4
SECTION 6
TROUBLESHOOTING
Introduction .......................... .6-l
Material does not flow when gun triggered ............. .6-2
Material leaks from nozzle .................... .6-2
Material leaks from swivel connector ............... .6-2
Material leaks around seat or insulator block ........... .6-3
Hose or gun fails to heat ..................... .6-3
Gun overheats ......................... .6-3
Electrical Tests ......................... .6-4
Wiring Diagram ........................ .6-4 -
SECTION 7
DISASSEMBLY AND REPAIR
Safety Precautions ....................... .7-l
Heater Cartridge And RTD Replacement ............. .7-l
Swivel Rebuild ......................... .7-3
Microswitch Replacement .................... .7-4
Microswitch Adjustment ..................... .7-5
Cordset Replacement ...................... .7-5
Ball And Seat Replacement ................... .7-6
SECTION 8
PARTS LISTS
Using The Parts Lists ...................... 8-l
A-l Handgun Versions ..................... .8-2
A-l Handgun Service Parts and Kits ............... .8-3
Gun Parts List ......................... .8-4
Nozzles ............................ .8-8
Hoses ............................. .8-9
Issued 3/93 0 NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page l-l
_-
SECTION 1
SAFETY SUMMARY
INTRODUCTlON
The following paragraphs provide safety guidelines for working safely
with Nordson@ adhesive and sealant application equipment. Some of
these guidelines are repeated- throughout the manual, along with
specific warnings and cautions not included here. These safety
guidelines cover:
l Safety During Installation,
l Safety During Operation,
. Safety During Servicing,
l Safety When Using Hot Melt Adhesives/Sealants, Solvents and
Reactive Materials,
l What to do if Molten Material Comes in Contact with the Skin.
Failure to follow these recommendations may result in personal injury
from burns or electrocution and/or equipment and property damage.
EXPLANATION OF TERMS AND SYMBOLS
The following safety symbols and signal words are used throughout
this publication to alert the reader to personal safety hazards, or to
identify conditions that may result in equipment or property damage.
A WARNING: This is a general warning. Failure to observe
this warning may result in personal injury or death.
A WARNING: This means risk of electrical shock. Failure to
‘r observe this warning may result in personal injury or
death.
A CAUTION: This is a general caution. Failure to observe
this caution may result in minor personal injury or
damage to property.
NOTE: This indicates important information. Failure to observe this
note may result in equipment damage.
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3/93

MANUAL NO. 26-4
Page 1-2 A-l HANDGUN
SAFETY DURING INSTALLATION
Electrical
l A protective electrical ground connection to a reliable earth ground
is essential for safe operation. Without one, all accessible conduc-
tive components (including knobs and controls that appear insu-
lated) can render an electric shock.
. A disconnect switch with lockout capability must be provided be-
tween the power source and the equipment.
l The power supply wire gauge and insulation must be sufficient to
meet the temperature and power requirements.
l Only fuses of the correct type voltage rating and current rating
should be used. Refer to the equipment parts list for fuse recom-
mendations. Using incorrect or non-recommended fuses can
present a fire hazard.
Pneumatic
Install a lockout, three-way, manual valve in the air supply line to the
filter/regulator. This valve makes it possible to relieve air pressure
and lock out the pneumatic system before undertaking maintenance
or repairs.
Gas System Installation
(FoamMelt@ applicators and nitrogen blanket kits only)
Cylinders of compressed gas are under high pressure and can present
significant safety hazards if handled improperly. Refer to OSHA
General Industry Standards, paragraphs 1910.101,1910.166 and
1910.167 for safety precautions that apply to the use, handling, and
storage of compressed air.
SAFETY DURING OPERATION
DO NOT operate Nordson equipment under the following conditions:
. At a pressure higher than the rated maximum working pressure of
any component in the system.
l Near volatile or otherwise explosive gases or materials.
l Without the covers, panel and safety guards properly installed.
issued 3/93 0 NORDSON CORPORATION 1993
All Rights Resetved Publication P/N 108 Of51

A-l HANDGUN MANUAL NO. 26-4
Page 1-3
l At atmospheric temperatures below 20°F (-6°C) or above 120°F
(50°C).
l With hoses enclosed in any material that interferes with heat dis-
sipation. This includes electrical conduit, insulation of any type, or
tight metal covers.
l With large areas of hose in contact with a cold floor, cold supports
or other such surfaces. Cold points along the hose restrict the flow
of adhesive inside the hose and can create potential problems
during operations.
l In drafty areas with the applicator guns unshielded from the draft.
Rapid heat dissipation due to air movement across the guns may
cause operational problems.
l (If a handgun is used) with the handgun trigger left unlocked
while the gun is unattended.
In addition:
l Use only the metal base when attempting to lift or move an ap-
plicator. DO NOT use equipment covers, doors, panels or hose con-
nectors as braces or grips.
l NEVER use Nordson equipment as a ladder or stepping stool.
l Route all hoses to prevent damage from kinking, abrasion and
other physical damage. DO NOT allow a hose to be installed with
a bend radius of less than 6 inches (15.1 cm).
l NEVER point an applicator handgun at yourself or anyone else.
SAFETY DURING SERVICING
l DO NOT perform internal service or adjustment on any equip-
ment unless another person capable of rendering first aid and
resuscitation is present.
l Only qualified personnel should service Nordson equipment.
l To avoid personal injury, never touch exposed connections and com-
ponents while power is ON. Dangerous voltages exist at several
points in the equipment.
Publication P/N 108 081 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3/93

MANUAL NO. 26-4
Page l-4 A-l HANDGUN
SAFETY DURING SERVICING (continued)
l Disconnect, lock out and tag external electrical power before
removing protective panels or replacing electrical components.
l Remove all jewelry (rings, watches, etc.) before servicing
equipment.
l If possible, stand on a rubber mat when servicing Nordson equip-
ment. DO NOT work on equipment if standing water is present.
Avoid working in a high-humidity atmosphere. Cover exposed ter-
minals and work areas with rubber sheeting to avoid accidental
contact while the power is ON.
l Always wear safety glasses, protective gloves and long-sleeved
protective clothing to prevent injury from hot applicator parts,
splashed hot melt adhesive and hot gun surfaces.
l To prevent serious injury from molten adhesive under pressure, al-
ways relieve system hydraulic pressure (by triggering the gun, for
example) before opening any hydraulic fitting or connection.
l NEVER use an open torch or drill to clean a nozzle. -
l NEVER operate equipment with a known leak in the system.
SAFETY WHEN USING HOT MELT
ADHESIVES/SEALANTS,
SOLVENTS AND REACTIVE MATERIALS
l Use extreme care when working with molten materials. They
solidify rapidly at high temperatures and present a hazard. Severe
burns can occur if the molten materials come in contact with the
skin. Even when first solidified, they are still hot.
l Always wear protective clothing and eye protection when handling
molten material or working near equipment containing hot melt
adhesives under pressure.
l DO NOT use an open flame or uncontrolled heating device to heat
solvents (for example, a small pan on an unregulated hot plate).
l Avoid a fire hazard by using a controlled heating device to heat sol-
vents (for example, a small deep fat fryer or thermostatically con-
trolled hot plate).
Issued 3/93 Q NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page l-5
SAFETY WHEN USING HOT MELT
ADHESIVES/SEALANTS,
SOLVENTS AND REACTIVE MATERIALS (contjnuect)
l DO NOT USE PAINT-TYPE SOLVENTS UNDER ANY CIR-
CUMSTANCES! These solvents are volatile and may be a fire
and/or toxic-vapor hazard even at room temperature.
l Always be sure the work area is adequately ventilated. Avoid
prolonged or repeated breathing of solvent vapors.
Halogenated Solvents
Halogenated Hydrocarbon Solvents are dangerous when used in a
pressurized fluid system that contains aluminum components. No
available stabilizers will prevent halogenated hydrocarbon solvents
from reacting with aluminum components.
l NEVER clean any aluminum component or flush any system
using halogenated hydrocarbon solvents. Use Type R solvent (P/N
270755) or contact your solvent or hot melt supplier for a non-
halogenated hydrocarbon solvent for cleaning and flushing.
Halogenated fluids include the following solvents:
Fluorinated Solvents:
Dichlorofluoromethane Trichlorofluoromethane
Chlorinated Solvents:
Carbon Tetrachloride
Dichloromethane
Methylene Chloride
Monochlorotoluene
Perchloroethylene
l-l-l Trichloroethane
Chloroform
Ethylene Dichloride
Monochlorobenzene
Orthodichlorobenzene
Trichloroethylene
Reactive Materials
Reactive materials may produce fumes when heated. When using reac-
tive materials in this system, do not set the operating temperatures or
over temperature limits without first consulting the adhesive manufac-
turer and the Material Safety Data Sheet (MSDS) concerning the
use of these materials.
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3/93

MANUAL NO. 26-4
Page 1-6 A-l HANDGUN
IF MOLTEN MATERIAL COMES
IN CONTACT WITH THE SKIN
l Do NOT try to remove the molten material from the skin.
l Immediately immerse the affected area in cold, clean water. Keep
the affected immersed until the material has cooled.
l Do NOT try to remove the cooled material from the skin.
. Cover the area with a clean, wet compress.
l In cases of severe burns, look for signs of shock. If shock is
suspected, have the patient lie down, use blankets to preserve
body heat and elevate the feet several inches.
l Call a physician immediately.
Issued 3/93 Q NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page 2-1
SECTION 2
EQUIPMENT FAMILIARIZATION
BOlTOM
FEED
Figure 2-1 - A-l Handguns
TOP
FEED
DESCRIPTION
Refer to Figure 2-1. The Nordson A- 1 Handgun is a dispensing gun for
manual application of high-viscosity material, or materials at high
flow rates, onto a substrate.
This manual covers sixteen different versions of the gun:
Heated Guns:
l 12OVAC, Switched, Top, Bottom, Left and Right Side Feed, with
Swivels
l 240 VAC, Switched, Top, Bottom, Left and Right Side Feed, with
Swivels
l 12OVAC, Switched, Top and Bottom Feed, without Swivels
l 240 VAC, Switched, Top and Bottom Feed, without Swivels
Unheated Guns:
l Unheated, Top and Bottom Feed, w/Swivels
l Unheated, Switched, Top and Bottom Feed, w/Swivels
Publication P/N 108 061 0 NORDSON CORPORATION 1993
AllRights Reserved Issued 3193

MANUAL NO. 26-4
Page 2-2 A-l HANDGUN
DESCRIPTION (continued)
The gun features a “cool handle” design with no heated parts in the
handgrip/trigger section.
The swivels allow the gun to be rotated 340 degrees at the hose connec-
tion without twisting or damage to the hose.
The thumb screw in the back of the gun handle is used to adjust trig-
ger travel, for consistent bead size with every application. When the
thumb screw is rotated fully clockwise, it locks the gun to prevent in-
advertent triggering when not in use.
Switched versions incorporate a microswitch, used to control operation
of the material supply pump, on the trigger mechanism.
Heated versions of the gun have two heater cartridges in the
hydraulic body Gun temperature is sensed and controlled by a
resistance temperature detector (RTD), also located in the body.
Optional Nozzles and Hoses
-
A wide variety of different nozzles, each allowing for precise control of
material deposition, are available for the gun. Section 8 of this manual
includes lists of available nozzles and heated hoses, as well as replace-
ment parts for the gun.
THEORY OF OPERATION
Material is delivered under hydraulic pressure from the bulkmelter or
unloader through a hose to the gun. Heated hoses are used with
bulkmelters to keep the material at the proper application tempera-
ture. Hose and gun temperature is controlled by either the bulkmelter
or a System Sentry@ Control Console.
The trigger is connected to a ball and seat valve in the hydraulic body.
Squeezing the gun trigger pulls the ball away from the seat, allowing
the pressurized material to be forced through the opening in the seat
and out through the nozzle.
A microswitch attached to the trigger mechanism closes and actuates
a solenoid (on piston pump units), starting the pump.
Issued 3/93 0 NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page 2-3
THEORY OF OPERATION (continuer
When the gun trigger is released, a spring forces the ball back against
the seat to positively stop material flow. The microswitch opens, stop-
ping the pump.
The gun should be hung by the loop provided in the top of the gun
handle when not in use.
SPECIFICATIONS
Dimensions
Length: 10.5 in. (26.7 cm)
Depth: 9.2 in. (23.4 cm)
Width: 2.4 in. (6.1 cm)
Weight
3.5 pounds (1.58 kg)
Electrical Requirements
120 VAC, 50/60 Hz, 60 watts
220/240 VAC, 50/60 Hz, 60 watts
Maximum Working Pressure
3000 psi (210 bar)
Publication P/N 108 061 0 NORDSON CORPORATION 1993
AllRights Reserved Issued 3193

MANUAL NO. 26-4
Page 2-4 A-l HANDGUN
This Page Intentionally Left Blank
-
Issued 3/93 0 NORDSONCORPORATION1993
All Rights Resend Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page 3-l
SECTION 3
INSTALLATION
UNPACKING
No special unpacking instructions are necessary. Use normal care to
prevent damage to the handgun when unpacking.
INSPECTION
After unpacking, inspect:
a. The gun surfaces for evidence of shipping damage.
b. For loose electrical connections.
c. All fasteners for tightness.
d. If damaged, contact your Nordson representative.
SAFETY PRECAUTIONS
A WARNING: This equipment contains energized electrical ’
t components with potentials that could be fatal. Discon-
nect and lock out input electrical power before installing
or servicing this equipment.
A
‘I WARNING: To prevent electrical shock, always complete
the hose-to-gun hydraulic and electrical connections
before connecting the hose to the bulk melter.
CIRCUIT BREAKER RETROFIT KITS
A
‘r
WARNING: Failure to change the circuit breakers in the
gun channels of the System Sentry@ Control Console and
Bulkmelter Series 5000 Units could result in damage to
the guns and/or injury to the operator.
Before using the A-l Handgun with a System Sentry Control Console
or a Bulkmelter, the gun circuit breakers in these units must be
changed. Heated 120VAC guns are shipped with System Sentry Con-
trol Console kits, 240VAC guns with Bulkmelter kits. The kits include
installation instructions.
-
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3193

MANUAL NO. 26-4
Page 3-2 A-l HANDGUN
H&E
SWIVEL: l'A6-12uN
BODY: %6-l 8UNF
TOP FEED
CORDSET
BOTTOM
FEED
.CORDSET
Figure 3-l - Connections
(Bottom Feed Version Shown)
1. Connect a material supply hose to the swivel
or hydraulic body. Tighten firmly.
a. Top and Bottom Feed, w/Swivel: Con-
nect hose to swivel connector. Connec-
tion is male, 1%6-12 UN.
b. Right and Left Side Feed: Install 90”
elbow shipped with gun onto swivel
connector, then connect hose. Connec-
tion is male, 1%6-12 UN.
c. Guns without swivels: Connect hose to
hydraulic body. Connection is female,
‘AS-18 UNF.
NOTE: To ensure a tight hose-to-gun hydraulic connection, hold the
swivel joint in place with a wrench across the swivel flat while using
another wrench to tighten the hose fitting.
NOTE: DO NOT use extra fittings or nipples to connect this gun to a
heated hose. A cold connection may result, adversely affecting
material flow and deposition.
2. Connect the hose electrical plug into the socket at the end of the A-l
cordset connector. Refer to Section 8 for cordset pinouts.
NOTE: Orient the gun-to-hose cable connector pins correctly before
completing the connection or damage to the equipment could result.
---.
Issued 3/93 0 NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 081

A-l HANDGUN MANUAL NO. 26-4
Page 4-l
SECTION 4
OPERATION
SETUP AND INITIAL OPERATION
A
5 WARNING: Failure to change the circuit breakers in the
gun channels of the System Sentry@ Control Console and
Bulk Melter Series 5000 Units could result in damage to
the guns and/or injury to the operator.
Before using the A-l Handgun with a System Sentry Control Console
or a Bulkmelter, make sure the gun circuit breakers in these units
have been changed. Refer to Section 8 in this manual for the circuit
breaker retrofit part numbers.
Heated guns receive input power from the bulkmelter. The gun will
not extrude material until the entire system reaches application
temperature. Use the following procedure to start up the system:
- A WARNING: Wear safety glasses, safety gloves and protec-
tive clothing to prevent injury from hot bulk melter parts,
splashed hot adhesives/sealants and hot gun surfaces.
A
‘I
WARNING: This equipment contains energized electrical
components with potentials that could be fatal. Only qualified
personnel should operate and service this equipment.
1. Start up the bulkmelter system in accordance with the bulkmelter
service manual.
NOTE: The following factors can affect the material output rate from
the handgun nozzle:
l A change in hydraulic pressure
l A change in application temperature
l A change to a lower or higher viscosity material
l A change in nozzle orifice size
l A change in hose length
l A change in the trigger-adjust thumb screw
2. Check the settings and factors which influence the discharge force of
material through the handgun nozzle.
3. Trigger the gun to purge air from the hose and gun.
The system is now ready for operation.
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3/93

MANUAL NO. 26-4
Page 4-2 A-l HANDGUN
ADJUSTMENT
Increase Deposition
To increase the amount of material being deposited on the substrate,
make one or more of the following changes:
a. Increase hydraulic pressure.
b. Install nozzle with larger orifice.
c. Rotate trigger-adjust thumb screw counter-clockwise and lock
with jam nut.
Decrease Deposition
To decrease the amount of material being deposited on the substrate,
make one or more of the following changes:
a. Decrease hydraulic pressure.
b. Install nozzle with smaller orifice. -
c. Rotate trigger-adjust thumb screw clockwise and lock with
jam nut.
SYSTEM SHUTDOWN
1. Shut down the bulkmelter system as described in the bulkmelter ser-
vice manual.
2. Rotate trigger-adjust thumb screw clockwise to a full stop.
A CAUTION: Never hang the A-l handgun by the trigger.
Hanging the gun by its trigger may cause an accidental
discharge of hot adhesive/sealant, resulting in burns.
3. Hang the A-l handgun by the loop on the top of the handle.
Issued 3/93 0 NORDSON CORPORATION 1993
All Rights Resewed Publication P/N 108 061

A-l HANDGUN MANUAL NO. 26-4
Page 5-l
-
SECTION 5
PREVENTIVE MAINTENANCE
GUN CLEANING
Daily
Clean all exterior gun and nozzle surfaces. Material accumulating on
the nozzle can cause erratic operation. Do not clean the gun exterior
with anything stronger than mineral spirits.
Weekly
Clean the nozzle bore. Refer to “Nozzle Cleaning” later in this section.
More or less frequent cleaning may be required depending on the ap-
plication and materials used.
GUN INSPECTION
SemiannuallyA
ZI
WARNING: This equipment contains energized electrical
components with potentials that could be fatal. Discon-
nect and lock out input electrical power before installing
or servicing this equipment.
A WARNING: To prevent burns from splashed hot material,
relieve system pressure before opening any hydraulic
connection.
1. Relieve system pressure by turning the bulkmelter pump selector
switch to the OFF position. Trigger the gun to relieve any trapped
residual pressure.
2. Disconnect the hose electrical plug from the A-l cordset connector.
3. Remove the screws and lockwashers securing the data plate to the
handle.
4. Inspect wiring insulation for signs of wear or other damage. Check
all electrical connections for tightness.
-- A
5(
WARNING: Vibration and heating/cooling cycles may
loosen connections, resulting in possible electric shock
or equipment damage.
Publication P/N 108 061 0 NORDSON CORPORATION 1993
All Rights Reserved Issued 3l93

MANUAL NO. 26-4
Page 5-2
GUN INSPECTION ~continued)
A-l HANDGUN
Figure 5-l - Electrical Connections
SWIVEL CONNECTOR
THRUST BEARING LUBRICATION
Semiannually
5. Inspect the sub-miniature switch on the
trigger mechanism for loose, damaged, or
worn parts. Replace if malfunctioning or
damaged.
6. Re-install the data plate on the handle.
7. Connect the hose to the gun.
8. Connect the hose electrical plug to the
cordset connector.
NOTE: Orient the gun-to-hose connector
pins correctly before completing the connec-
tion or equipment damage could result.
9. Restore the system to normal operation as
described in the bulkmelter service
manual.
WARNING: This equipment contains energized electrical
components with potentials that could be fatal. Discon-
nect and lock out input electrical power before installing
or servicing this equipment.
A WARNING: To prevent burns from splashed hot material,
relieve system pressure before opening any hydraulic
connection.
1. Relieve system pressure by turning the bulkmelter pump selector
switch to the OFF position. Trigger the gun to relieve any trapped
residual pressure.
2. Disconnect the hose electrical plug from the A-l cordset connector.
NOTE: It may be necessary to heat the swivel connector and hose fit-
ting before Step 3 can be completed.
Issued 3/93 0 NORDSON CORPORATION 1993
All Rights Reserved Publication P/N 108 061