Grobet USA 21.819W User manual

HIGH PERFORMANCE
DRY VACUUM PUMP
No. 21.819W - 110 olt
No. 21.819WX - 220 volt
OPERATING INSTRUCTIONS
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WARNING
Not recommended for pumping acid, base or organic vapors or gases.
Be sure to properly identify intake and discharge before using pump.
This manual has been compiled not only for the care and maintenance of
the Grobet Dry Vacuum pump now in your possession, but as a helpful
reference and guide to prevent many problems which can occur if used
improperly.
UNPACKING
Carefully remove the Dry Vacuum pump from the shipping case and
unfasten and remove wooden skid. Preserve all paperwork for future
reference. If damage has occurred from shipment a claim must be filed
with the carrier immediately. Preserve the shipping carton for inspection by
the carrier. If you are required to communicate with your dealer or Grobet
Vacuum be sure to include your order numbers for quick identification. Do
not return the pump to the factory without first calling for a returned goods
number.
PUMP MOUNTING
Rubber feet are attached to the pump. Rubber feet are excellent for
applications involving a semi-flexible surface such as a bench top; they
help to isolate noise and eliminate creeping. All models of Dry Vacuum
Pumps should be mounted in a horizontal plane.
PUMP LOCATION
The pressure/vacuum pump should be located preferably in a clean, dry
and well-ventilated area. Please be sure not to block the ventilation ports
located on the motor housing. The pump should be placed where the
surrounding temperature remains between 10°C and 40°C (50°F and
104°F). Always check to insure the location choice is protected from direct
or indirect moisture contact. Grobet recommends that the pump be
installed at the highest point within the system to prevent possible water
condensate from entering the pump. The pump should be located as
closely to its system in order to utilize it most efficiently.
WARNING
Don’t pump flammable or explosive gases or vapors or operate this pump in an
atmosphere containing flammable or explosive gases or vapors.
Bursting Hazard- use on exhaust port the silencer or air handling parts suitable
for pressures not less than 100 PSIG
INSTALLATION
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INTAKE AND DISCHARGE PROVISIONS
The intake provision is a hose barb which accepts 3/8” ID vacuum hose .
Asilencer is supplied for the exhaust.
ELECTRICAL POWER SOURCE
Review the power source and the motor rating to be sure they agree in
voltage, phase and frequency. Serious damage may occur to the motor if
it is connected to an improper voltage. All Grobet pumps must be
grounded. Grounding reduces the risk of electrical shock in the event of an
electrical short circuit. The plug must be plugged into an outlet properly
grounded. Consult your local electrical codes if you have doubts.
OVERLOAD PROTECTION
The motor manufacturer makes motor thermal overload protection
available as an aid to minimizing motor failure. Overload protection is a
standard feature on both 50 and 60 Hz single-phase motors. The motors
have automatic overload protection. Automatic reset protection is
designed to reset itself after a predetermined cooling period. If the fault to
the drive remains unaltered, the motor will cycle on and off until fault is
corrected.
WARNING
The motor is thermally protected and will automatically restart unexpectedly
when the overload device resets.
IDENTIFICATION SYMBOLS
GROUNDING INSTRUCTIONS
This product should be grounded. 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 is equipped with a cord having a
grounding wire with a grounding plug. The plug must be plugged into an
outlet that is properly installed and grounded in accordance with all local
codes and ordinances.
DANGER
Improper installation of the grounding plug can result in a
risk of electrical shock.
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
having an outer surface that is green with or without yellow stripes is the
grounding wire.
OFF (Power)
ON (Power)
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Check with a qualified electrician or serviceman if the grounding
instructions are not completely understood, or if in doubt as to 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.
This product is for use on a nominal 120V circuit, and has a grounding
plug that looks like the plug illustrated in Sketch A in Figure #1. A
temporary adapter, which looks like the adapter illustrated in sketches
Band C, may be used to connect this plug to a 2-pole receptacle
as shown in sketch B if a properly grounded outlet is not available.
The temporary adapter should be used only untill a properly grounded
outlet (Sketch A) can be installed by a qualified electrician. The green
colored rigid ear, lug, etc. extending from the adapter must be connected
to a permanent ground such as a properly grounded outlet box cover.
Whenever the adapter is used, it must be held in place by a metal screw.
The adapter shown in Figure B and Figure C is not acceptable in Canada.
EXTENSION CORDS
If neccessary to use an extension cord, use a 3-wire extension cord that
has a 3-blade grounding plug, and a 3-slot receptacle that will accept the
plug on the product. Make certain your extension cord is in good
condition. Make certain your extension cord wire size is not less than 18
guage for 25 feet, 16 guage for 50 feet, and 14 guage for 100 feet. An
undersized cord will cause a drop in line voltage resulting in loss of power
and overheating. If in doubt, use the next heavier cord. The smaller the
guage number, the heavier the cord.
VACUUM CONNECTIONS
All Dry Vacuum Pumps come with intake and discharge hose barbs which
accept 3/8” ID rubber pressure/vacuum hose. Hose clamps should be
used to hold the hose in place. Since all four models operate in the
viscous flow regime, the small diameter of the hose will generate minimal
conductance loss. For best results, Grobet recommends the length of the
tubing between the pump and the chamber be kept as small as possible.
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VACUUM GAUGES
Typical in the rough vacuum range, a dial vacuum gauge is used to measure
pressure in mm, Hg or inches of Hg. The dial vacuum gauge gives negative
pressure – that is pressure below atmospheric. The reference point for the
vacuum gauge is atmospheric pressure.
Please keep in mind that atmospheric pressure tends to vary from day to
day. As a result of variability, the dial vacuum gauge will indicate slightly
different maximum vacuum readings from day to day.
TRAPS
The pumps will handle humid air. All wetted aluminum parts are treated for
corrosion protection from moisture. All other wetted parts are stainless steel.
If there is a chance liquid may be drawn from the process under evacuation,
Grobet recommends a liquid trap be placed between the process and the
pump. A simple liquid trap is a filtering flask.
When a heavy load of water vapor is evolved from the vacuum process, a
cold trap is recommended to help prevent damage to the pump mechanism.
The cold trap, immersed in a suitable Dewar flask, is installed so that the
water vapor may come in contact with the surfaces of the trap and
condense. Commonly used refrigerants are liquid nitrogen or dry ice and
acetone or alcohol. Dry ice provides sufficient cooling to freeze out most
heavy water vapor loads. A variety of cold traps are available from Grobet.
The symptom of a high water vapor load is if you have droplets coming out
of the exhaust port. If you see droplets of water, Grobet recommends you
use a cold trap to capture the water before entering the pump or dilute the
water vapor stream by adding dry nitrogen to the gas flow.
When using a cold trap the refrigerant should be maintained at a high level
in the flask to keep the trap at a uniformly low temperature. If the trap is re-
warmed it may allow re-evaporation of the condensate. The refrigerant add
tube on the liquid nitrogen trap should not be obstructed as the refrigerant
boil-off can produce dangerously high pressures. If the trap becomes
saturated it should be disconnected from the system, drained and cleaned.
An increase in pressure in the vacuum system will normally indicate that the
trap has become saturated. To clean the trap, remove the trap from the
system and allow the trap to warm up and rinse off the condensate with a
suitable solvent in a fume hood. Thoroughly clean and dry the trap before
reinstalling into the system.
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STARTING A GROBET DRY VACUUM PUMP
Before attaching the pump to a system it is well to familiarize yourself with
the function and action of the pressure vacuum pump that you have
acquired. Review the power requirements as described in Electrial Power
Section. Grobet recommends running the pump for a few minutes to warm
up before use. The warm-up improves the pumps ability to handle humid
air.
CLEANLINESS
Take every precaution to prevent foreign particulates from entering the
pump. Particulates will damage the pump’s performance. If you find that
particulates will come off the process during evacuation, a particulate trap
in the foreline will work. A simple, inexpensive trap may be made by
placing glass wool in a glass or plastic tube. Screens must be inserted to
hold the glass wool in place.
WARNING
The pump is not recommended for pumping acid, base or organic vapors or
gases. Serious damage to the pump will shorten the pump’s service life. In
addition, pumping flammable vapors or gases can lead to serious safety hazard
leading to fire or explosion.
LEAK DETECTION
The importance of eliminating all leaks in a vacuum system is obvious.
The pump must remove this added volume of leaked gas to maintain the
desired vacuum. Leaks for these pumps can be located by slightly
pressuring the system and painting the suspected area with a thick soap
solution. Escaping air will produce soap bubbles.
OPERATING PRESSURE RANGE
The Dry Vacuum Pumps are designed to be run from atmospheric to their
maximum vacuum level on the intake side. Consult the Specification Table
in the back of this manual for the ratings for your specific model.
SHUTDOWN PROCEDURES
After use, Grobet recommends the pump be run for about 2 minutes
disconnected from the vacuum process. The air pumped through the
mechanism will purge out water vapor or droplets of water condensate that
may have formed on the inside of the pump. This purge of the pump
mechanism helps prevent corrosion.
OPERATION
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Grobet dry pressure\vacuum units are 100% oil-free. The pump employs a
non-lube piston and cylinder. No maintenance is necessary for the
bearings. All bearings are sealed and permanently lubricated. Lubrication
should not be attempted. The units are built for continuous duty operation
with the quietness and durability of a diaphragm, but with piston
performance.
VACUUM PROBLEMS
Leakage, contamination and unusual outgassing are the general causes of
problems with poor vacuum. To operate at maximum efficiency a system
must be thoroughly clean. If the system is completely clean and free from
leaks, and unwarranted vacuum problems still exist, the pump should be
checked. A simple criterion for the condition of the pump is the
determination of its maximum vacuum capability. This can be
accomplished by blocking of the intake and reading the vacuum level on
the gauge.
TROUBLESHOOTING GUIDE
Poor Pumping Poor Loud
Speed Vacuum Unit Possible Cause Corrective Action
XXXDamaged Valves Replace flapper valves
XXXDebris in Valves Remove debris and
check for valve damage
XXXDamaged Gaskets Replace gaskets
XXXLoose Head Screws Tighten head Screws
XXLoose Fittings Tighten fittings
TROUBLESHOOTING
MAINTENANCE
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This Grobet product is warranted to be free from defects in material and
workmanship. This liability of Grobet under this warranty is limited to
servicing, adjusting, repairing, or replacing any unit or component part
which in the judgment of Grobet has not been misused, abused, or altered in
any way or damaged by ingestion of foreign material causing impaired
performance or rendering it inoperative. No other warranties are expressed
or implied. The method of executing this warranty: servicing, adjusting,
repairing, or replacing, shall be at the discretion of Grobet Vacuum pumps
that have been operated within a vacuum system, or other system, for any
period, however short, will be repaired under this warranty rather than
replaced.
The warranty is effective for one year from the date of original purchase
when:
1. The warranty card has been completed and returned.
2. The product is returned to the factory or other designated service centers,
freight prepaid.
3. The product in our judgment is defective through no action or fault of the
user.
If the product has become defective through misuse, abuse, alteration, or
ingestion of foreign material, repairs will be billed regardless of the age of
the product. In this event, an estimate of the repair costs will be submitted
and authorization of these charges will be required before the product is
repaired and returned.
WARRANTY
ASK YOUR LOCAL DISTRIBUTOR FOR MORE
INFORMATION ON OTHER PRODUCTS BY GROBET USA™
Carlstadt, NJ 07072
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