Gast DOA-P504-BN User Manual

www.gastmfg.com

ISO 9001 & 14001 CERTIFIED

®Registered Trademark/™Trademark of Gast Manu facturing Inc., Copyright © 2002 Gast Manufacturing Inc. All Rights Reserved.

PART NO. 70 - 3005 G443PL (Rev. D)

OIL-LESS DIAPHRAGM

VACUUM PUMPS & COMPRESSORS

OPERATION & MAINTENANCE MANUAL

Model DOA Shown

Thank you for purchasing this Gast product. It is manufactured to the highest standards

using quality materials. Please follow all recommended maintenance, operational

and safety instructions and you will receive years of trouble free service.

WARNING

PLEASE READ THIS MANUAL COMPLETELY BEFORE INSTALLING AND USING

THIS PRODUCT. SAVE THIS MANUAL FOR FUTURE REFERENCE AND

KEEP IN THE VICINITY OF THE PRODUCT

Product Use Criteria:

• Pump only clean, dry air.

• Operate at 32ºF - 104ºF (0ºC - 40ºC).

• Protect unit from dirt & moisture.

• Do not pump flammable or explosive gases or
use in an atmosphere that contains such gases.

• Protect all surrounding items from exhaust air. This
exhaust air can become very hot.

• Corrosive gases and particulate material will
damage unit. Water vapor, oil-based contaminants
or other liquids must be filtered out.

• Consult your Gast Distributor/Representative
before using at high altitudes.

• This pump is oil-less and requires NO lubrication.

• Pressure units may be used for both pressure and vacuum.
Consult your Gast Distributor/Representative
to use vacuum units for pressure.

Model DAA Shown

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Your safety and the safety of others

is extremely important.

e have provided many important safety messages in

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this manual and on your product. Always read and
obey all safety messages.

Plumbing

Remove plugs from the IN and OUT ports. Connect
with pipe and fittings that are the same size or larger
than the productʼs threaded ports. Be sure to connect
the intake and exhaust plumbing to the correct inlet and
outlet ports. Ports will not support the weight of the

plumbing.

his is the safety alert symbol. This symbol

T
alerts you to hazards that can kill or hurt you and
others. The safety alert symbol and the words
“DANGER” and “WARNING” will precede all safety

essages. These words mean:

m

DANGER

e killed or seriously injured if you donʼt follow

b

ou will

Y
instructions.

You can
instructions.

All safety messages will identify the hazard, tell you
how to reduce the chance of injury, and tell you what
can happen if the safety instructions are not followed.

INSTALLATION

be killed or seriously injured if you donʼt follow

Accessories

Filters and mufflers are supplied with some models.
These should be checked periodically and replaced
when necessary. Please consult your Gast
Distributor/Representative for additional filter
recommendations.

Install relief valves and gauges at inlet or outlet, or both,
to monitor performance. Check valves may be required

o prevent back streaming through the pump.

t

Motor Control
It is your responsibility to contact a qualified
electrician and assure that the electrical installation is
adequate and in conformance with all national and local
codes and ordinances. The metal capacitor shell must
be grounded.

Determine the correct overload setting required to
protect the motor (see motor starter manufacturerʼs
recommendations). Select fuses, motor protective
switches or thermal protective switches to provide
protection. Fuses act as short circuit protection for the
motor, not as protection against overload. Incoming line
fuses must be able to withstand the motorʼs starting
current. Motor starters with thermal magnetic overload
or circuit breakers protect motor from overload or
reduced voltage conditions.

Electrical Shock Hazard

Disconnect electrical power at the circuit breaker
or fuse box before installing this product.

Install this product where it will not come into
contact with water or other liquids.

Install this product where it will be weather
protected.

Electrically ground this product.

Failure to follow these instructions can result in
death, fire or electrical shock.

Correct installation is your responsibility. Make sure you

have the proper installation conditions and that
installation clearances do not block air flow.

Blocking air flow over the product in any way can cause
the product to overheat.

Mounting

This product can be installed in any orientation.
Mounting the product to a stable, rigid operating surface
and using shock mounts will reduce noise and vibration.

The wiring diagram supplied with the product provides
required electrical information. Check that power
source is correct to properly operate the dual-voltage
motors.

Electrical Connection

Electrical Shock Hazard

This product must be properly grounded.

Do not modify the plug provided. If it will not
fill the outlet, have the proper outlet installed
by a qualified electrician.

If repair or replacement of the cord or plug is
necessary, do not connect the grounding wire
to either flat blade terminal. The wire with
insulation that is green with or without yellow
stripes is the grounding wire.

Check the condition of the power supply wiring.
Do not permanently connect this product to
wiring that is not in good condition or is
inadequate for the requirements of this product.

Failure to follow these instructions can result in
death, fire or electrical shock.

2

Model with a power supply cord:

Grounded Plug

Grounding Pin

Grounded Outlet

120-volt grounded connectors
shown. 220/240-volt grounded
connectors will differ in shape.

DIAGRAM A

This product must be grounded. For either 120-volt or
220/240-volt circuits connect power supply cord
grounding plug to a matching grounded outlet. Do not
use an adapter. (See DIAGRAM A)

In the event of an electrical short circuit, grounding
reduces the risk of electric shock by providing an
escape wire for the electric current. This product may
be equipped with a power supply cord having a
grounding wire with an appropriate grounding plug.
The plug must be plugged into an outlet that is properly
installed and grounded in accordance with all local
codes and ordinances.

Check with a qualified electrician or serviceman if the
grounding instructions are not completely understood,
or if you are not sure whether the product is properly
grounded. Do not modify the plug provided. If it will not
fit the outlet, have the proper outlet installed by a
qualified electrician.

Model that is permanently wired:

This product must be connected to a grounded,
metallic, permanent wiring system, or an equipment
grounding terminal or lead on the product.

Power supply wiring must conform to all required safety
codes and be installed by a qualified person. Check
that supply voltage agrees with that listed on product
nameplate.

In the event of an electrical short circuit, grounding
reduces the risk of electric shock by providing an
escape wire for the electric current. This product may
be equipped with a power supply cord having a
grounding wire with an appropriate grounding plug. The
plug must be plugged into an outlet that is properly
installed and grounded in accordance with all local
codes and ordinances.

Extension cords:

Use only a 3-wire extension cord that has a 3-blade
grounding plug. Connect extension cord plug to a
matching 3-slot receptacle. Do not use an adapter.
Make sure your extension cord is in good condition.
Check that the gage wire of the extension cord is the
correct size wire to carry the current this product will
draw.

An undersized cord is a potential fire hazard, and will
cause a drop in line voltage resulting in loss of power
causing the product to overheat. The following table
indicates the correct size cord for length required and
the ampere rating listed on the product nameplate. If in

doubt, use the next heavier gage cord. The smaller the
gage number, the heavier the wire gage.

-Minimum gage for extension cords

Amps Volts Length of cord in feet

20v 25 50 100 150 200 250 300 400 500

1

40v 50 100 200 300 400 500 600 800 1000

2

-2 18 18 18 16 16 14 14 12 12

0

-3 18 18 16 14 14 12 12 10 10

2

-4 18 18 16 14 12 12 10 10 8

3
4-5 18 18 14 12 12 10 10 88

-6 18 16 14 12 10 10 888

5

-8 18 16 12 10 10 8666

6

-10 18 14 12 10 88664

8
10-12 16 14 10 886644
12-14 16 12 10 866642

4-16 16 12 10 866442

1

6-18 14 12 8864422

1
18-20 14 12 8664422

OPERATION

Injury Hazard

Install proper safety guards as needed.
Use only recommended air handling parts acceptable
for pressure not less than 70 psi.
Keep fingers and objects away from openings and
rotating parts.
When provided, motor terminal covers must be in
place for safe operation.
Product surfaces become very hot during operation,
allow product surfaces to cool before handling.
Do NOT direct air stream at body. Air stream from
product may contain solid or liquid material that can
result in eye or skin damage, wear proper eye
protection.
Do NOT spray flammable or combustible liquid.
Wear hearing protection. Sound level from motor
may exceed 70 dBA.
Failure to follow these instructions can result in
burns, eye injury or other serious injury.

It is your responsibility to operate this product at
recommended pressures or vacuum duties and room
ambient temperatures. Do not start against a vacuum
or pressure load.

Start Up

If motor fails to start or slows down significantly under
load, shut off and disconnect from power supply. Check
that the voltage is correct for motor and that motor is
turning in the proper direction.

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