Gast R7P User Manual

www.gastmfg.com

ISO 9001 & 14001 CERTIFIED

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

PART NO. 70 - 6000 F2-200 (REV-L)

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.

STANDARD REGENAIR BLOWER

OPERATION & MAINTENANCE MANUAL

Model R1 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.

General information

This manual does not apply to:

• SDR Series blowers without motors

• Blowers powered with Explosion Proof Motors

Product Use Criteria:

• Pump only clean, dry air.

• Operate at -20ºF - 104ºF (-29ºC - 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.

• The blower must be installed with the properly sized inlet and inline filters, gauges and
relief valves to protect the product from dirt and over-heating.

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

Model R6P350A Shown

Model R7P Shown

1

Your safety and the safety of others

c

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.

WARNING

Electrical Shock Hazard

is extremely important.

We have provided many important safety messages in
this manual and on your product. Always read and
obey all safety messages.

This is the safety alert symbol. This symbol
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
messages. These words mean:

DANGER

You will
instructions.

be killed or seriously injured if you donʼt follow

WARNING

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

Mounting

he single impeller blower should be oriented with the

T
shaft in a horizontal position, unless the modelʼs product
features state otherwise. The dual impeller models must
be mounted with the shaft in a horizontal position.
Mounting the product to a stable, rigid operating surface
and using shock mounts will reduce noise and vibration.

Rotation

From the motor side of the blower, check that the blower is
rotating clockwise. (The motor side is marked with an
arrow on most models.) Proper rotation can also be
checked by the air flow at the IN and OUT ports. On
blowers powered by a 3-phase motor, incorrectly
connecting any two power lines can reverse direction.

Plumbing
Remove any foreign material (burrs, chips, welding
drops, slag, pipe cuttings, excess sealant, sand or lime)
from plumbing.

Check motor mounting and rotation before connecting
to plumbing. Inlet and outlet ports are not designed to
support plumbing.

Remove plugs from the IN and OUT ports. Use a small
amount of pipe thread lubricant when connecting
plumbing to protect the aluminum blower threads.
Connect with pipe and fittings that are the same size or
larger than the productʼs threaded ports. When
installing two blowers in parallel, use plumbing that is
two whole pipe sizes larger in diameter than that of the
blower. Be sure to connect the intake and exhaust
plumbing to the correct inlet and outlet ports.

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.

The blower must be installed with the properly sized
inlet filter, gauge and relief valve to protect the product
from dirt and over-heating.

2

Plumbing to remove the hot discharge air of larger
blowers may be required to help maintain proper room
ambient temperature. Use a relief valve to discharge
excess air into the atmosphere. If the blower will be
operated at 125mbar (50” H
required for hot exhaust air.

Accessories

Install two vacuum gauges, one before and one after
filter, to monitor restriction through filters. As filters
become clogged, performance efficiency will be
reduced. Filters should be checked periodically and
replaced when necessary. See page 7 for installation.

Install a relief valve to avoid changes in pressure or
vacuum that can cause overloading of large blowers.
Install an intake filter with a relief valve to prevent
foreign material from entering blower if blower is used in
a vacuum application in a dirty environment. In
applications where there is high humidity or liquids
being used in the process, install a moisture separator.

See Recommended Accessories on pages 7-9 or
consult your Gast Distributor/Representative for
additional filter and accessories recommendations. Do
Not install check valves that close with a strong spring.
The recommended check valves (page 7) provide
minimal pressure drop, positive sealing and are
resistant to the high discharge temperatures of large
blowers.

Motor Installation
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.

2O) or higher, metal pipe is

Select fuses, motor protective switches or thermal

c

This product must be properly grounded.

Do not modify the plug provided. If it will not
fit 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 or green with 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.

WARNING

Electrical Shock Hazard

Grounded Plug

Grounding Pin

Grounded Outlet

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

DIAGRAM A

protective switches to provide protection. Fuses act as

hort circuit protection for the motor, not as protection

s
against overload. Incoming line fuses must be able to
withstand the motorʼs starting current. Motor starters
with thermal magnetic overload or circuit breakers

rotect motor from overload or reduced voltage

p
conditions. Motors without automatic restart require
thermal protection or magnetic over-current cutout to
prevent motor overloading from one phase in a 3-phase

ircuit, high starting frequency or jammed blower.

c

The power required will rise as differential pressure
increases. The wiring diagram attached to the product

r on page 6 of this manual provides required electrical

o
information. Large motors have two diagrams, one for
50Hz wiring specifications and the other for 60Hz wiring
specifications. Check that the power source is correct
to properly operate the dual-voltage motor. If additional
information is required, please consult your Gast
Distributor/Representative.

Electrical Connection

Model with a power supply cord:

his product must be grounded. For either 120-volt or

T
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.

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

120v 25 50 100 150 200 250 300 400 500
240v 50 100 200 300 400 500 600 800 1000

0-2 18 18 18 16 16 14 14 12 12
2-3 18 18 16 14 14 12 12 10 10
3-4 18 18 16 14 12 12 10 10 8
4-5 18 18 14 12 12 10 10 88
5-6 18 16 14 12 10 10 888
6-8 18 16 12 10 10 8666
8-10 18 14 12 10 88664
10-12 16 14 10 886644
12-14 16 12 10 866642
14-16 16 12 10 866442
16-18 14 12 8864422
18-20 14 12 8664422

3

OPERATION

I

njury Hazard

Install proper safety guards as needed to prevent
any close contact with blower suction area.

Keep fingers and objects away from openings and
rotating parts.

Product surfaces become very hot during operation,
allow product surfaces to cool before handling.

Air stream from product may contain solid or liquid
material that can result in eye or skin damage,
wear proper eye protection.

Wear hearing protection. Sound level from some
models may exceed 85 dBA.

Failure to follow these instructions can result in
burns, eye injury or other serious injury.

WARNING

c

WARNING

Electrical Shock Hazard

Disconnect electrical power supply cord before
performing maintenance on this product.

Some motors are thermally protected and will
automatically re-start when protector resets.

If product is hard wired into system, disconnect
electrical power at the circuit breaker or fuse box
before performing maintenance on this product.

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

If the product is supplied with an electric power
chord, protect it from twisting, cuts and abrasion.
When not in use, store in a clean dry place

Injury Hazard

Product surfaces become very hot during operation,
allow product surfaces to cool before handling.

Air stream from product may contain solid or liquid
material that can result in eye or skin damage,
wear proper eye protection.

Failure to follow these instructions can result in
burns, eye injury or other serious injury.

WARNING

It is your responsibility to operate this product at
recommended pressures or vacuum duties and room
ambient temperatures. Do not operate R4P or larger
size blowers without air flowing through the blower. Do
not throttle discharge or suction pipe to reducer
capacity. Throttle will increase differential pressure
causing increasing power absorption and working
temperatures.

Start Up

Operate blower for an hour and then check:

1. Ambient temperature – Check room and discharge
air temperatures. Increased room temperatures

may require stronger ventilation especially for larger
blowers. Exhaust air should not exceed 215ºF
(102ºC) for all blowers less than 3.5 Hp. Exhaust air
should not exceed 275ºF (135ºC) for all blowers
above 3.5 Hp.

2. Working pressure and vacuum values – Adjust

relief valve pressure or vacuum setting, if needed.

3. Motor current – Check that supply current matches

recommended current rating on product nameplate.

4. Electrical overload cutout – Check that current

matches rating on product nameplate.

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.

FOR BLOWERS WITH GREASE FITTINGS

Hours of Service Relubrication
Per Year Intervals

5,000 3 years

Continual Normal Service 1 year

Seasonal Service (motor 1 year at beginning of
idle for 6 months or more) season

Continuous-high ambients, 6 months
dirty or moist applications

Check that all external accessories such as relief valves
and gauges are not damaged before re-operating
product.

4

AINTENANCE

M

It is your responsibility to regularly inspect and make
necessary repairs to this product in order to maintain
proper operation. Make sure that pressure and vacuum
is released from product before starting maintenance.

Check filter elements and noise absorbing foam used in
mufflers and clean motor and blower after first 500
hours of operation. Replace filter elements and
determine how frequently mufflers should be checked
during future operation. This one procedure will help
assure the productʼs performance and service life.

When there is an increase in the differential pressure
across the inlet filter it is beginning to clog with dirt.
Replace the cartridge when the filter will not come
clean.

Small motor bearings (less than 5.5 Hp) never need to
be greased. Larger motor bearings (greater than 5.5
Hp) have alemite grease fittings. Use a grease gun and
apply one or two strokes of Exxon POLYREX® grease
to the fittings to lubricate larger motor bearings.