Nordson A20A User manual

A20A Automatic Electric
Airless Spray Gun
Customer Product Manual
Part 108182-03
Issued 03/17
NORDSON CORPORATION •AMHERST, OHIO •USA
C
APPROVED
US
FM
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at [phone] or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.

Part 108182-03 E2017 Nordson Corporation
Table of Contents
Safety 1.......................................
Qualified Personnel 1.........................
Intended Use 1..............................
Regulations and Approvals 1..................
Personal Safety 2............................
High-Pressure Fluids 2.....................
Fire Safety 3................................
Halogenated Hydrocarbon Solvent Hazards 4.
Action in the Event of a Malfunction 4...........
Disposal 4..................................
Safety Labels 5..............................
Description 6..................................
Features 6...................................
Models 6...................................
Specifications 7...............................
Ratings and Label Information 7...............
Installation 8..................................
Mounting 8..................................
Fluid Connections 8..........................
Electrical Connections 8.......................
Baseefa Special Conditions
for Safe Use 9...............................
Spray Monitor System Installation 9.............
Transducer Installation 9....................
CO-Plate Installation 9......................
CO-Plate Selection 10.......................
Operation 11...................................
Maintenance 11................................
Troubleshooting 12.............................
Repair 13......................................
Ball and Seat Module Replacement 13...........
Removal 13................................
Installation 13..............................
Solenoid Coil Replacement 14..................
Armature Replacement 15.....................
Parts 17.......................................
Gun Models 17...............................
Service Kits 17...............................
Standard Short and Extended A20A Spray Guns 18
CE/ATEX Short and Extended A20A Spray Guns 20
8-Inch Extended Standard A20A Spray Gun 22...
Service Kits 24...............................
Ball and Seat Kit 24.........................
Standard Coil Kit 24........................
CE/ATEX Approved Coil Kit 24...............
Armature Kits 25...........................
Buna-N Soft Goods Kit 25...................
EPR Soft Goods Kit 25......................
Contact Us
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 1999. 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
CanWorks, CleanSleeve, Nordson, and the Nordson logo are registered
trademarks of Nordson Corporation.
All other trademarks are the property of their respective owners.

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A20A Automatic Electric Airless Spray Gun
Safety
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.
Qualified Personnel
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.
Intended Use
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
Regulations and Approvals
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.

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Personal Safety
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.
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.

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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.
Fire Safety
To avoid a fire or explosion, follow these instructions.
SGround all conductive equipment. 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.

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Fire Safety (contd)
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 when 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.
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.
Action in the Event of a Malfunction
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.
Disposal
Dispose of equipment and materials used in operation and servicing
according to local codes.

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Safety Labels
See Figure 1 for the location of the safety label on the applicator. The
safety label is provided to help you operate and maintain your equipment
safely. The label reads:
WARNING: Do not open when an explosive gas atmosphere is present.
Max ambient temperature: 140 _F (60 _C)
Safety Label
(All Models)
R
ATMOSPHERE IS AN EXPLOSIVE GAS
MODEL A20A
OHIO 44001 PRESENT.
NORDSON CORP. USA
DO NOT OPEN WHEN
WHEN
SPHERE
F(60 C)
Figure 1 Safety Label Location

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Description
The A20A Electric Spray Gun is a fast cycle, airless automatic spray gun
designed for use in high-speed container coating applications. The gun can
be used with the Nordson iTrax System or the Flow Sentry System.
Features
SOn-line removable valve/seat module
SIntegral electric solenoid
SNo packing cartridge or moving seals
SStainless steel construction of wetted parts
SCompatibility with a wide range of wide range of water-based and
solvent-based lacquers
SUses Nordson Controlled Pattern or Cross-Cut nozzles
SCan be used in dead-end or circulating systems
Models
See Figure 2. The A20A applicator is available in the following models:
Part Description Approvals
135576 Short Standard FM
141426 Short ATEX CE/ATEX
135575 Extended Standard FM
141425 Extended ATEX CE/ATEX
144466 8 in. Extended None
The CE/ATEX approved models have a covered solenoid end.
R
R
R
Short Standard Extended Standard
8 inch Extended Standard
R
R
Short ATEX Extended ATEX
Figure 2 A20A Models

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Specifications
Dimensions and Weight
Length:
SShort Standard 124 mm (4.88 in.)
SShort ATEX
SExtended Standard 168 mm (6.62 in.)
SExtended ATEX
S8 in. Extended
Width 75 mm (2.94 in.)
Height 67 mm (2.62 in.)
Weight:
SShort Standard 1.13 kg (2.5 lbs)
SShort ATEX
SExtended Standard 1.25 kg (2.75 lbs)
SExtended ATEX
S8 in. Extended
Electrical
Driver requirements 24 Vdc, 1.5 amps
Connection 1/2-in. NPT female conduit fitting
Fluid
Maximum fluid pressure 104 bar (1500 psi)
Maximum fluid temperature 60 _C (140 _F)
Connection 1/2-20 JIC elbow fittings
Ratings and Label Information
Ex db IIB T3 Gb
Baseefa02ATEX0049X
1180
10,500kPa Max Press
2 G
24 Vdc Max
1.5 amp Max
(Ta = −20 _C to
+60 _C)
CE/ATEX Approved
24 Vdc 1.5 amps
Max Press 1500 psi
(10400 kPa)
Class 1, Group D
T3C Ta=60 _C
FM −US and Canada Approved
US
C
Figure 3 Ratings and Label Information

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Installation
WARNING: Allow only qualified personnel to perform the following tasks.
Follow the safety instructions in this document and all other related
documentation.
WARNING: The purchaser should make the manufacturer aware of any
external effects or aggressive substances that the equipment may be
exposed to.
Mounting
Mount the gun to any mounting plate, using the two #10−32 x 2.5 in. screws
shipped with the gun and the two holes in the body. Refer to the
Specifications for gun dimensions.
Fluid Connections
WARNING: An approved pressure relief device set at 104 bar (1500 psi)
must be installed in the fluid line to the gun. The fluid hoses connected to
the gun must have a minimum burst pressure of 104 bar (1500 psi).
The supply and return hoses can be connected to either one of the fluid
fittings on the gun. The fittings are 1/2-20 JIC male connectors.
If using the gun in a dead-end system, replace the unused fitting with a
1/4in. NPT stainless steel plug.
Electrical Connections
The gun can be connected to any 24 Vdc driver that supplies a minimum of
1.5 amps (such as a Nordson FET-1 or FET-2 timer). The solenoid housing
has a 1/2-in. NPT female thread for connection to an electrical conduit.
The solenoid housing can be rotated by loosening or removing the jam nut
and housing nut, or on CE approved models, the set screw and housing nut.
R
R
1
4
3
2
5
67
8
Figure 4 Installation
1. Housing nut (CE)
2. Set screw (CE)
3. Jam nut
4. Housing nut
5. Fluid fittings
6. Conduit connection
7. CO-plate plug
8. Transducer plug