Meech A60015A User manual

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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
Ofce 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 airow
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 specic 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 specic 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 orices 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
efciency.
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 specied 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.
Specic 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 sufcient volume (cfm) of air.
To ensure that both pressure and volume are present to efciently 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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How to determine what size of PIPE you need for
compressed air lines:
TABLE 1: EQUIVALENT LENGTH OF PIPE LINES IN FEET
Don’t forget to include *PIPE FITTINGS in your final calculations
Your Air
Compressor’s
CFM
25
feet
50
feet
75
feet 100 feet 150 feet 200 feet 250 feet 300 feet
1 ½ ½ ½ ½ ½ ½ ½ ½
2 ½ ½ ½ ½ ½ ½ ½ ½
3 ½ ½ ½ ½ ½ ½ ½ ½
5 ½ ½ ½ ½ ½ ½ ½ ½
10 ½ ½ ½ ¾ ¾ ¾ ¾ ¾
15 ½ ¾ ¾ ¾ ¾ ¾ ¾ ¾
20 ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾
25 ¾ ¾ ¾ ¾ ¾ 1 1 1
30 ¾ ¾ ¾ ¾ 1 1 1 1
35 ¾ ¾ 1 1 1 1 1 1
40 ¾ 1 1 1 1 1 1 1
50 1 1 1 1 1 1 1 1
60 1 1 1 1 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4
70 1 1 1 1 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4
80 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2
100 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2
125 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2
150 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/4 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2
175 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2 2 2 2 2
200 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2 2 2 2 2
225 1 - 1/2 1 - 1/2 1 - 1/2 1 - 1/2 2 2 2 2
250 2 2 2 2 2 2 2 2
275 2 2 2 2 2 2 2 - 1/2 2 - 1/2
300 2 2 2 2 2 2 2 - 1/2 2 - 1/2
350 2 2 2 2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2
400 2 2 2 2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2
450 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 3 3
500 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 3 3
550 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 3 3 3 3
600 2 - 1/2 2 - 1/2 2 - 1/2 2 - 1/2 3 3 3 3
750 2 - 1/2 2 - 1/2 2 - 1/2 3 3 3 3 4
1000 3 3 3 3 3 3 4 4
TABLE 2: * EQUIVALENT LENGTH OF PIPE (FT.) for PIPE FITTINGS
Add these numbers for each pipe fitting to total length of straight pipe
Pipe
Size
Long Rad, Ell or
run of tee
STD. Ell or Run of
reduced tee
Tee Thru
side outlet Globe Valve Gate Valve
½ 0.62 1.55 3.1 17.3 0.36
¾ 0.82 2.06 4.12 22.9 0.48
1 1.05 2.62 5.24 29.1 0.61
1 - 1/4 1.38 3.45 6.9 38.3 0.81
1 - 1/2 1.61 4.02 8.04 44.7 0.94
2 2.07 5.17 10.3 57.4 1.21
2 - 1/2 2.47 6.16 12.3 68.5 1.44
3 3.07 6.16 15.3 85.2 1.79
4 4.03 7.67 20.2 112 2.35

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6. Installation
All Meech Coldstream Guns are tted with a strong magnet allowing it to be tted to
any surface that will hold the magnet.
The magnet can be removed by unscrewing the hot end silencer and removing the nut
holding the magnet in place.
Air Fitting
The large Coldstream Gun has a ¼” BSP female air tting.
The small Coldstream Gun has a 1/8” BSP female air tting.
Standard Pneumatic push-t compressed air ttings can be used on the Coldstream
Gun.

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7. Operation
Coldstream Gun
All Coldstream Guns are set to deliver the most efcient cooling possible. Coldstream
Guns are factory set to 70% cold fraction at 80psi (5.4 Bar). As standard they are tted
with a Red 15 cfm Generator, so approximaty 10cfm of cold air will exit through the cold
end of the Coldstream Gun.
Cold Fraction
The Cold fraction is the percentage of input compressed air that is released through
the cold end of the Coldstream Gun. The Cold Fraction is adjusted in two ways, by
adjusting the control relief valve to exhaust more or less air (Adjustable version only) or
by changing the generator inside the Coldstream Gun.
There are two levels of Generator, either a “high” or “low” cold fraction model. A “high”
cold fraction Generator is where more than 50% of the air ow exits through the cold
end of the Coldstream Gun. This setting will suit most industrial applications as it
provides the most efcient cooling, although not the coldest possible temperature.
A “low” cold fraction Generator is where less than 50% of the air ow exits through the
cold end of the Coldstream Gun. This setting will provide the lowest air temperatures
but will not be as efcient.
Generators
The Coldstream Gun is supplied with a set of 4 high fraction Generators as standard.
Yellow 10cfm (283 l/min)
Red 15cfm (425 l/min)
Blue 25cfm (708 l/min)
Brown 35cfm (991 l/min)
There are also 4 Cold Fraction generators available,
The Generators within the Coldstream Gun control the air consumption and air ow,
they also inuence the achievable temperatures.

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To change the Generator, simply unscrew the cold end silencer (the end the knuckle
trunking is tted to).
You will then need to remove the cold cap from the Vortex Tube. You can simply
unscrew this from the ColdStream Gun. Inside you will nd an O’ring and Generator.
Finally remove the generator and replace with new generator, please also remember
to t the original O-ring.
Reassemble the parts remembering to tighten everything well, failure to tighten could
lead to a drop in performance.

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Adjustable and Non Adjustable ColdStream Guns
The Coldstream Gun is available in either an adjustable or non-adjustable version.
The non-adjustable version is factory set at 80psi (5.4 Bar) to 70% cold fraction. The
only way to adjust this is by changing generators.
The Adjustable version of the Coldstream features a control knob that allows ne-
tuning of the volume of hot air exiting the Coldstream Gun. This in turn affects the
volume of cold air and the temperature of that air.
Like the non-adjustable version the adjustable Coldstream Gun is factory set at 80psi
(5.4 Bar) to 70% cold fraction. To reset to the factory setting turn the control knob
clockwise until closed. Once it is completely closed you can set to 70 Cold Fraction by
turning the knob 2.5 turns anti-clockwise

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Flexible Knuckle Trunking
All Coldstream Guns feature either single or double outlet hoses.
The single outlet hose is made of 12 x ½” exible knuckles. The overall length of the
hose is approximately 310mm.
The double outlet hose is comprised of 2 hoses connected by a Y junction. Each
hose is made up of 15 x ¼” exible knuckles. The overall length of the hose is
approximately 320mm.
Both the single and double hoses come with a standard round ¼” or 1/2” nozzle.
There is also a range of spare parts these include a range of at nozzle in various
sizes and additional knuckle trunking to increase the length of the exible trunking. For
more information please contact the Meech ofce.

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8. Troubleshooting
Air Flow
Problems with compressed air ow can be caused by:
1. Air pressure too low – increase air pressure at the relevant regulator.
2. Undersized compressed air lines – replace pipes with correct sizes, see section 5.
3. Blocked compressed air line – remove blockage.
4. Insufcient compressor size – Check compressor size for tting.
Coldstream Air Gun
Problems with the air temperature can be caused by:
1. Incorrect generator tted – Check and replace generator (see section 7)
2. Ambient Compressed air temperature to high – Check compressed air
temperature and use cooler if necessary.
3. Loose/missing parts – Check all Cabinet Cooler parts are screwed in tightly and
there are no missing parts.
4. Water vapour in the compressed air supply – Check compressed air
supply.
5. Air pressure too low – increase air pressure at the relevant regulator

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Meech International (UK)
2 Network Point
Range Road, Witney
OX29 0YN, UK
Tel: [phone]
Fax: [phone]
email: [email protected]
Meech CE
2151 Fót
Széchenyi út. 46
Hungary
Tel: [phone]
Fax: [phone]
email: [email protected]
Meech Static Eliminators USA Inc
2915 Newpark Drive
Norton, OH 44203
USA
Tel: [phone]
Fax: [phone]
email: [email protected]
Meech Static Eliminators
(Shanghai) Co. Ltd
Room 205, Huana Hotel Ofce Tower
No. 1733 Lianhua Road
Shanghai 201103
China
Tel: [phone]
Fax: [phone]*201
email: [email protected]
Meech Elektrostatik SA
Kaiserbaracke 66
B-4780 St.Vith
Belgium
Tel: [phone]
Fax: [phone]
email: [email protected]
Meech Shavotech
Shavo House, Survey No.21A / 10 B, Plot No.394
South Main Road, Koregaon Park,
PUNE 411 001
India
Tel: [phone],
Fax: [phone]
e-mail: [email protected]