Nordson A7A Reference guide

A7A Quattro Modular
Automatic Spray Gun
Customer Product Manual
Document Number1602111-03
Issued 07/22
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.
NORDSON CORPORATION • AMHERST, OHIO • USA

© 2022 Nordson Corporation
1602111-03
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 2012. 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
Nordson and the Nordson logo are registered trademarks of Nordson
Corporation. All other trademarks are the property of their respective owners.
Table of Contents
Safety............................................................................................ 1
Introduction................................................................................... 1
Qualied Personnel...................................................................... 1
Intended Use................................................................................ 1
Regulations and Approvals........................................................... 1
Personal Safety............................................................................ 2
High-Pressure Fluids................................................................... 3
Fire Safety.................................................................................... 4
Halogenated Hydrocarbon Solvent Hazards............................... 4
Action in the Event of a Malfunction............................................. 5
Disposal........................................................................................ 5
Description................................................................................... 6
Nozzles......................................................................................... 6
Specications ............................................................................... 6
Gun Module Components and Operation..................................... 8
Installation.................................................................................... 9
Mounting....................................................................................... 9
Fluid Connections......................................................................... 9
Trigger Air Connection................................................................ 10
Nozzle Installation ...................................................................... 10
Maintenance............................................................................... 10
Troubleshooting ........................................................................ 11
Spray Gun Repair ...................................................................... 12
Disassembly............................................................................... 12
Cleaning and Inspection............................................................. 12
Assembly.................................................................................... 12
Parts............................................................................................ 14
Options....................................................................................... 16
Service Kits ................................................................................ 16
Service Parts.............................................................................. 16
Options....................................................................................... 17
Service Kits ................................................................................ 17
Service Parts.............................................................................. 17

i
Change Record
© 2022 Nordson Corporation 1602111-03
Change Record
Revision Date Change
02 8/18 Revised ATEX markings.
03 07/22 Added CE and UK symbols.

© 2022 Nordson Corporation
1602111-03
ii Change Record

1
A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation 1602111-03
Introduction
Read and follow these safety instructions. Task- and equipment-specic 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.
Qualied Personnel
Equipment owners are responsible for making sure that Nordson equipment is installed,
operated, and serviced by qualied personnel. Qualied 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:
• using incompatible materials
• making unauthorized modications
• removing or bypassing safety guards or interlocks
• using incompatible or damaged parts
• using unapproved auxiliary equipment
• operating 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.
Safety

2A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation
1602111-03
Personal Safety
To prevent injury follow these instructions.
• Do not operate or service equipment unless you are qualied.
• Do 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.
• Keep clear of moving equipment. Before adjusting or servicing moving equipment,
shut o󰀨 the power supply and wait until the equipment comes to a complete stop.
Lock out power and secure the equipment to prevent unexpected movement.
• Relieve (bleed o󰀨) hydraulic and pneumatic pressure before adjusting or servicing
pressurized systems or components. Disconnect, lock out, and tag switches before
servicing electrical equipment.
• While 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.
• If 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
identied and corrected.
• Obtain and read Safety Data Sheets (SDS) for all materials used. Follow the
manufacturer’s instructions for safe handling and use of materials, and use
recommended personal protection devices.
• Make sure the spray area is adequately ventilated. To 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.

3
A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation 1602111-03
High-Pressure Fluids
High-pressure uids, unless they are safely contained, are extremely hazardous. Always
relieve uid pressure before adjusting or servicing high pressure equipment. A jet of
high-pressure uid can cut like a knife and cause serious bodily injury, amputation, or
death. Fluids penetrating the skin can also cause toxic poisoning.
If you su󰀨er a uid injection injury, seek medical care immediately. If possible, provide a
copy of the SDS for the injected uid 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:
• Go to an emergency room immediately.
• Tell the doctor that you suspect an injection injury.
• Show them this card
• Tell them 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 deected causing more damage, and many
other variables including skin microora 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 ourish. 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.

4A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation
1602111-03
Fire Safety
To avoid a re or explosion, follow these instructions.
• Ground all conductive equipment. Use only grounded air and uid hoses. Check
equipment and workpiece grounding devices regularly. Resistance to ground must not
exceed one megohm.
• Shut down all equipment immediately if you notice static sparking or arcing. Do not
restart the equipment until the cause has been identied and corrected.
• Do not smoke, weld, grind, or use open ames where ammable materials are being
used or stored. Do not heat materials to temperatures above those recommended
by the manufacturer. Make sure heat monitoring and limiting devices are working
properly.
• Provide adequate ventilation to prevent dangerous concentrations of volatile particles
or vapors. Refer to local codes or your material SDS for guidance.
• Do not disconnect live electrical circuits when working with ammable materials. Shut
o󰀨 power at a disconnect switch rst to prevent sparking.
• Know where emergency stop buttons, shuto󰀨 valves, and re extinguishers are
located. If a re starts in a spray booth, immediately shut o󰀨 the spray system and
exhaust fans.
• Shut o󰀨 electrostatic power and ground the charging system before adjusting,
cleaning, or repairing electrostatic equipment.
• Clean, maintain, test, and repair equipment according to the instructions in your
equipment documentation.
• Use 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 Prex
Fluorine F “Fluoro-”
Chlorine Cl “Chloro-”
Bromine Br “Bromo-”
Iodine I “Iodo-”
Check your material SDS 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.

5
A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation 1602111-03
Action in the Event of a Malfunction
If a system or any equipment in a system malfunctions, shut o󰀨 the system immediately
and perform the following steps:
• Disconnect and lock out system electrical power. Close hydraulic and pneumatic
shuto󰀨 valves and relieve pressures.
• Identify 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.

6A7A Quattro Modular Automatic Spray Gun
© 2022 Nordson Corporation
1602111-03
Description
The Quattro A7A automatic spray gun is a high-cycle, air-operated, modular airless spray
gun with four gun modules supplying one manifold and nozzle. It can be used for general
nishing as well as ultra-high speed applications using solventborne or waterborne
coatings where quick color changes are required.
Nozzles
Nozzles are not included with the spray gun. For information on Nordson airless nozzles
and help in choosing the correct nozzle for your application, contact your Nordson
representative.
Gun Modules
Nozzle Nut
Quattro Manifold
Fluid/Air/Mounting
Manifolds
Fluid Fittings
Air Fittings
Figure 1 A7A Quattro Spray Gun
Specications
Properties Specication
Maximum uid pressure 103 bar (1500 psi)
Air trigger requirements 2.75-8.27 bar (40-120 psi)
Fittings
Fluid air supply and return 1/2-20 JIC x 1/4-in. NPT
Trigger air 1/4-in. tubing x 1/8-in. NPT
Dimensions See Figure 2
Weight 5.21 kg (11.5 lbs)
Mounting 13-mm (1/2-in.) round bar