Meech A60015A Manuale utente
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Operating
Manual
Coldstream Air Gun,
Adjustable Coldstream Air Gun and
Small Coldstream Air Gun
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Contents
Section Page
1. Introduction 3
2. Safety and Inspection 4
3. Maintenance 5
4. Compressed Air Supply 6
5. Compressed Air Line Sizes 7
6. Installation 8
Air Fitting
7. Operation 9
Coldstream Gun
Cold Fraction
Generators
Adjustable and Non-Adjustable
Flexible Knuckle Trunking
8. Troubleshooting 12
Products shown in this document may be covered by one or more patents, patents applied for
and/or registered designs and/or trade marks. For further information please refer to our Head
Ofce or visit www.meech.com.
© Meech Static Eliminators Ltd.
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1. Introduction
The Meech Air Technology Stainless Steel ColdStream Air Gun provides a cold airow
commonly used for spot cooling.
At the heart of the ColdStream Gun is the Vortex Tube which is encased in a hot and
cold end silencer. Cold air produced by the Vortex is directed to specic area through
knuckle trucking. Hot air is then vented through two holes located in the silencer.
The cold air temperature can be as low as 50°C below the inlet air temperature and
be maintained to +/- 0.6°C.
Coldstream Guns have no moving parts and so are intrinsically safe. They require
virtually no maintenance which makes them ideal for harsh environments.
They are available in either adjustable or non-adjustable versions.
This operating manual covers products:
A60015A – Adjustable Large Coldstream Gun, one outlet hose
A60015AY – Adjustable Large Coldstream Gun, two outlet hose
A60015 – Large Coldstream Gun, one outlet hose
A60015Y – Large ColdStream Gun, two outlet hose
A60008 – Small Coldstream Air Gun, one outlet hose
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2. Safety and Inspection
All Meech products are packed carefully at our factory. Nevertheless, we recommend
careful examination of the carton and contents for any damage.
To protect yourself and others when using compressed air, you should be aware of the
following general safety guidelines:
Warning – When compressed air is misused, it can cause serious injury or even
death.
Never point an air hose at anyone in fun or to remove dirt from clothing or the
body.
Never use compressed air without adequate eye and ear protection. Use safety
glasses with side shields or goggles and ear protectors.
Before attempting to disconnect a hose from an airline, the air should be cut off,
and the remaining air bled from the line.
Keep air hoses off the oor where they become tripping hazards and are subject
to damage by vehicles, doors, and dropped tools. If possible, suspend air hoses
from overhead. Please be aware of the following safety guidelines:
Please be aware of the following Safety guidelines specic to the Coldstream Gun:
Do not operate the Coldstream Gun at compressed air pressures above 11 Bar
(160 psi)
All Coldstream Guns create both hot and cold air so parts of the unit will become
hot.
Compressed Air Temperature must not exceed 55°C.
Ambient operating temperature can not drop lower than -10°C.
Ambient operating temperatures must not exceed 66°C.
Compressed air temperature must not exceed 55°C.
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3. Maintenance
The Meech Coldstream Gun has no moving parts, making them virtually maintenance
free. Clean and dry compressed air moving through the Coldstream Gun will not
cause wear on any of the components.
Occasionally dirt, water or oil may enter the Coldstream Gun from the compressed
air supply, which could hinder performance. If this happens simply take the unit apart,
clean the parts with soapy water, allow drying time and then reassemble.
When reassembling ensure you tighten all the components. If the parts are not
tightened performance may be affected.
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4. Compressed Air Supply
It is recommended to use a 5-micron (or smaller) lter to remove water and dirt from
the compressed air supply.
A 5 micron lter will remove 99% of foreign material from the air supply; the use of an
oil lter with an effective ltration of 0.01 ppm will remove the oil droplets for an even
cleaner compressed air supply.
Failure to use a lter may cause clogging and/or freezing of the compressed air line
and the components within the Coldstream Air Gun.
When the temperature of the compressed air within the Coldstream Gun reaches 0°C
the water vapour in the air will start to freeze. This could potentially cause a problem
with ice clogging the orices of the Coldstream gun.
In this instance an air dryer must be used to lower the dew point and keep water
vapour out of the air line. A dryer rated at 19°C will produce a dew point low enough to
eliminate the water vapour freezing.
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5. Compressed Air Lines Sizes
Figuring the correct pipe size for your compressed air system is an important task.
Pipe that is sized too small can create big pressure losses and reduce operating
efciency.
Many people who plan the piping never consider the ttings or the future.
FITTINGS: Every pipe tting creates a certain amount of increased frictional air loss
that is equal to a specied length of pipe. Any turns in the pipe at ttings, ells, tees,
and valves increase pressure drops even more.
FUTURE: Are you planning to add more equipment in the next year or two? Then
plan for larger piping now. Since the material costs in piping are low compared to
installation or replacement cost, it’s wise to select pipe of an adequate size. If there
is any doubt that a pipe size may create a pressure drop, use the next largest size.
Remember that an oversize pipe compensates for possible scale build-up and
provides for future expansion of the overall air system.
Steps to calculating overall piping size for your compressed
air system:
1. Determine your air compressor’s maximum CFM.
2. Draw a piping schematic and show all pipe ttings, valves, etc.
3. Measure and write the corresponding lengths of pipe on your schematic, then
total the length of all straight pipes needed and note that on your schematic.
4. Using TABLE 1 (over page), nd your compressor’s CFM number
on the far left column, and then go to the right until you see the column header
with nearest length in feet to your total pipe length. Find where the CFM & PIPE
LENGTH intersect on the chart and it will show the recommended pipe size for
that length.
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5. Take that pipe size to TABLE 2 and use the table to nd all the EQUIVELENT
LENGTHS OF PIPE needed for each PIPE FITTING. Write these lengths on
your piping schematic at each tting.
6. TOTAL all the EQUIVELENT LENGTHS OF PIPE needed for each PIPE
FITTING and add to your total of straight length of pipe. This will give you a
new and more accurate total pipe length needed.
7. Take your new total of EQUIVELENT LENGTH OF PIPE IN FEET back to
TABLE 1 and use this number to determine the PIPE SIZE you need.
Specic Coldstream Gun Pipe Size
To obtain maximum performance from the Coldstream Gun, accurate measures of air
pressure and air volume must be obtained. Line pressure of 70-90 psi (5-6 Bar) can be
present without a sufcient volume (cfm) of air.
To ensure that both pressure and volume are present to efciently operate the
Coldstream Gun a line size of 3/8” pipe or ½” hose should be used for applications 10ft
from the main header. Use ½” pipe or ¾” hose up to 20ft. For pipe size over 20ft from
he header please refer to the table over the page.
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