Nordson A7AA Reference guide

Model A7AA Air Assisted

Airless Gun

Customer Product Manual

Part 108 046C

NORDSON CORPORATION AMHERST, OHIO USA

OBSOLETE

2000 Nordson Corporation

108 046C

Issued 1/00

Manual 4-20

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 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

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.

Viton is a registered trademark of E.I. DuPont de Nemours & Co.

Table of Contents

2000 Nordson Corporation

Issued 1/00 Manual 4-20

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Quick-Exhaust Valve 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Operation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shutdown 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Maintenance 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Troubleshooting 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting Chart 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Repair 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gun Disassembly 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gun Assembly 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Parts 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Illustrated Parts List 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A7AA Airless Gun 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Seal Service Kit 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ball Tip With Seat Service Kit 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended Spare Parts 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

2000 Nordson Corporation

108 046C

Issued 1/00

Manual 4-20

9. Options 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nozzles and Air Cap 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Specifications 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dimensions 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Weight 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pressures 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model A7AA Air Assisted Airless Gun

2000 Nordson Corporation

Issued 1/00 Manual 4-20

Model A7AA Air Assisted Airless Gun

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

using incompatible materials

making unauthorized modifications

removing or bypassing safety guards or interlocks

using incompatible or damaged parts

using unapproved auxiliary equipment

operating 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 A7AA Air Assisted Airless Gun

2000 Nordson Corporation

108 046C

Issued 1/00

Manual 4-20

To prevent injury follow these instructions.

Do not operate or service equipment unless you are qualified.

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 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.

Relieve (bleed off) 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 identified and corrected.

Obtain 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.

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.

Personal Safety

Model A7AA Air Assisted Airless Gun

2000 Nordson Corporation

Issued 1/00 Manual 4-20

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:

Go to an emergency room immediately.

Tell the doctor that you suspect an injection injury.

Show him this card.

Tell 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 A7AA Air Assisted Airless Gun

2000 Nordson Corporation

108 046C

Issued 1/00

Manual 4-20

To avoid a fire or explosion, follow these instructions.

Ground 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.

Shut down all equipment immediately if you notice static sparking or

arcing. Do not restart the equipment until the cause has been

identified and corrected.

Do not smoke, weld, grind, or use open flames where flammable

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

MSDS for guidance.

Do not disconnect live electrical circuits while working with flammable

materials. Shut off power at a disconnect switch first to prevent

sparking.

Know 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.

Shut off 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.

Fire Safety

Model A7AA Air Assisted Airless Gun

2000 Nordson Corporation

Issued 1/00 Manual 4-20

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:

Disconnect and lock out system electrical power. Close hydraulic and

pneumatic shutoff valves and relieve pressures.

Identify 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 A7AA Air Assisted Airless Gun

2000 Nordson Corporation

108 046C

Issued 1/00

Manual 4-20

See Figure 1. The model A7AA gun is a compact, high-cycle, air

assisted airless spray gun. The A7AA is designed to spray solvent or

waterborne coatings, and may be used in a wide variety of applications.

The wetted parts of the A7AA gun are constructed of stainless steel for

corrosion resistance. The A7AA can be used for dead-end or circulating

applications. It is also suitable for use in heated systems up to 92 C

(200 F) or ambient fluid systems.

Due to its fast trigger cycle capability, the A7AA may be used for ultra

high speed applications as well as common product finishing. Its simple

design and rugged construction provide for long service life and easy

field maintenance. In the event of a gun failure, several repair kits are

provided to reduce downtime.

0420001A

Fig. 1 Model A7AA Air Assisted Airless Gun

2. Description

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