Nuvair MCH13 User manual

User Manual
Open Vertical Electric
MCH13 / 16
Rev. 05.20
www.nuvair.com

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If you have any questions on this equipment please contact Technical Support at:
Nuvair
1600 Beacon Place
Oxnard, CA 93033
Phone: [phone]
Fax: [phone]
Email: [email protected]
Hours: Monday through Friday
8:00 AM to 5:00 PM PST USA
This User Manual contains important safety information and should always be available to
those personnel operating this equipment. Read, understand, and retain all instructions
before operating this equipment to prevent injury or equipment damage.
Every effort was made to ensure the accuracy of the information contained within. Nuvair, however,
retains the right to modify its contents without notice. If you have problems or questions after reading
the manual, stop and call Nuvair at [phone] for information.

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Table of Contents
Introduction
1.0 Introduction ……………………………………………………………………… 6
1.1 Required Operator Training ……………………………………… 6
1.2 Important Information for the User ……………………………… 6
1.3 Foreword ……………………………………………………………… 7
1.4 Assistance ……………………………………………………………… 8
1.5 Responsibility ……………………………………………………… 8
1.6 Purpose of the Machine ……………………………………………… 8
1.7 Proper Compressor Use ……………………………………………... 9
1.8 Where the Compressor May be Used ……………………………... 10
1.9 Running and Testing the Compressor ……………………………... 11
2.0 Safety Warnings ……………………………………………………………… 11
3.0 Safety and Operation Precautions ……………………………………… 12
4.0 System Components ……………………………………………………… 13
5.0 Component Identification ……………………………………………………… 14
6.0 Compressor Specifications ……………………………………………… 16
7.0 Unpacking and Installing ……………………………………………………… 17
7.1 Electrical Connection ……………………………………………… 17
8.0 Daily Checks ……………………………………………………………………… 17
8.1 Lubricating Oil Level Check ……………………………………... 17
8.2 Check that Refill Hoses are in Good Condition …………………....... 17
9.0 Storing Technical Documents ……………………………………………... 17
10.0 Gauges ……………………………………………………………………… 18
10.1 Fill Pressure Gauge ……………………………………………………… 18
10.2 Optional Interstage Pressure Gauges ……………………………… 18
11.0 Safety Valve Checks ……………………………………………………… 19
12.0 Bottle Refill ……………………………………………………………………… 19
13.0 Maintenance ……………………………………………………………………… 21
13.1 Foreword ……………………………………………………………… 21
13.2 General ……………………………………………………………… 21
13.3 Unscheduled Work ……………………………………………………… 21
13.4 Scheduled Maintenance Table ……………………………………… 21
14.0 Troubleshooting ……………………………………………………………… 22
15.0 Checking and Changing the Lubrication Oil ……………………………… 22
15.1 Checking the Oil Level ……………………………………………… 23
15.2 Changing the Oil ……………………………………………………… 24
15.3 Tightening Torque Values ……………………………………………… 24
15.4 Optional Visual CO / Moisture Monitor ……………………………… 24
15.5 Changing the Air Intake Filter ……………………………………… 25
16.0 Transmission Belt ……………………………………………………………… 25
16.1 Checking the Transmission Belt ……………………………………… 25

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17.0 HP Compressor Filtration – Active Carbon Filter/Molecular Sieve ……. 26
17.1 Temperature Affect on Filter Life ……………………………………. 27
17.2 Condensate Discharge ……………………………………………. 28
18.0 Electrical Connection ……………………………………………………. 28
19.0 Storage ……………………………………………………………………. 29
19.1 Stopping the Machine for a Brief Period ……………………………. 29
19.2 Stopping the Machine for an Extended Period ……………………. 29
20.0 Dismantling and Putting the Compressor Out of Service ……………. 29
20.1 Waste Disposal ……………………………………………………. 30
20.2 Dismantling the Compressor ……………………………………. 30
21.0 In Case of Fire ……………………………………………………………. 31
22.0 Maintenance Register ……………………………………………………. 31
22.1 Customer Service ……………………………………………………. 31
22.2 Scheduled Maintenance ……………………………………………. 31
22.3 Using the Compressor Under Heavy Duty Conditions ……………. 31
22.4 Nuvair Customer Care Contact ……………………………………. 31
23.0 Spare Parts List ……………………………………………………………. 32
Appendix
Supply and Breathing Air Specifications …………………………………… 33
Filter Element Life Factors …………………………………………………… 33
Nuvair System Compressor Warranty …………………………………… 34
Service Log …………………………………………………………………… 35
Additional Record of Changes …………………………………………… 36
User Notes …………………………………………………………………… 37
Separate Manuals Included:
Compressor Parts Manual

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1.0 Introduction
This manual will assist you in the proper set-up, operation and maintenance of the Nuvair Open
Vertical Electric compressor packages. Be sure to read the entire manual.
Throughout this manual we will use certain words to call your attention to conditions, practices or
techniques that may directly affect your safety. Pay particular attention to information introduced by
the following signal words:
Indicates an imminently hazardous situation, which if not avoided, will result in serious
personal injury or death.
Indicates a potentially hazardous situation, which if not avoided, could result in serious
personal injury or death.
Indicates a potentially hazardous situation, which if not avoided, may result in minor or
moderate injury. It may also be used to alert against unsafe practices.
Notifies people of installation, operation or maintenance information which is important but
not hazard-related.
1.1 Required Operator Training
This manual must be read carefully:
 all compressor operators / maintenance personnel must read this entire manual with due
care and attention and observe the instructions/information contained herein.
 Company owners ensure that the operator has the required training for operation of the
compressor and that he/she has read the manual.
1.2 Important Information for the User
The information/instructions for compressor use contained in this manual concern the Nuvair
compressor: Open Vertical Electric
The instruction manual must be read and used as follows:
 read this manual carefully; treat it as an essential part of the compressor;
 the instruction manual must be kept where it can readily be consulted by compressor
operators and maintenance staff;
 keep the manual for the working life of the compressor;
 make sure updates are incorporated in the manual;
 make sure the manual is given to other users or subsequent owners in the event of resale;
 keep the manual in good condition and ensure its contents remain undamaged;
 do not remove, tear or re-write any part of the manual for any reason;
 keep the manual protected from damp and heat;
 if the manual is lost or partially damaged and its contents cannot be read it is advisable to
request a copy from the manufacturer.

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1.3 Foreword
The regulations/instructions for use contained in this manual constitute an essential
component of the supplied compressor.
These regulations/instructions are intended for an operator who has already been trained to
use this type of compressor. The contained information is necessary and essential to efficient
and proper use of the compressor.
Hurried or careless preparation leads to improvisation, which is the cause of accidents.
Before beginning work, read the following suggestions carefully:
1) Before using the compressor, gain familiarity with the tasks to be completed and the
admissible working position;
2) The operator must always have the instruction manual to hand;
3) Plan all work with due care and attention;
4) You must have a detailed understanding of where and how the compressor is to be used;
5) Before starting work make sure that safety devices are working properly and that their use is
understood; in the event of any doubts do not use the compressor;
6) Observe the warnings given in this manual with due care and attention;
7) Constant and careful preventive maintenance will always ensure a high level of safety when
using the compressor. Never postpone repairs and have them carried out by specialized
personnel only; use only original spare parts.

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1.4 Assistance
Nuvair technicians are at your disposal for all routine/unscheduled maintenance work. Please
forward your request for assistance to Nuvair by sending a fax or e-mail to:
Phone: [phone] Fax: [phone]
Email: [email protected]
1.5 Responsibility
Nuvair considers itself exonerated from any responsibility or obligation regarding injury or
damage caused by:
 Failure to observe the instructions contained in this manual that concern the running,
use and maintenance of the compressor;
 Violent actions or incorrect maneuvers during use or maintenance of the compressor;
 Modifications made to the compressor without prior written authorization from Nuvair;
 Incidents beyond the scope of routine, proper use of the compressor.
Maintenance and repairs must only be carried out using original spare parts and qualified
technicians. Nuvair cannot be held liable for any damages caused by failure to observe this
rule. The compressor is guaranteed as per the contractual agreements made at the time of
sale. Failure to observe the regulations and instructions for use contained in this manual shall
render the warranty null and void.
1.6 Purpose of the Machine
The high pressure compressor model Open Vertical Electric has been designed and built for
the purpose of producing breathing air by drawing it from the surrounding environment. The
surrounding environment air must be free from any harmful fumes or contaminates. The air is
passed through an intake air filter, compressed and run through breathing air filtration before it
is stored in bottles constructed to contain air at high pressure. When properly equipped, the
compressor can also be used for the pumping of gases:
 Nitrogen
 Helium
 Nitrox mixtures up to 40%
Any other use is inappropriate: the manufacturer cannot be held liable for any personal injury
or damage to objects / the machine itself caused by improper use.
Use only tested, certified bottles: do not exceed the working pressure indicated on them.
Drain air before filling when tanks have set for a period of time unused.

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1.7 Proper Compressor Use
 Improper use could have serious consequences for the user.
 Use the compressor in areas free from dust, risk of explosion, corrosion and fire.
 Do not disconnect the hose from the fittings or the clamp when under pressure.
 Change the air purification filters regularly as described in the Maintenance section.
 Drain the condensate regularly as illustrated in section “Condensate discharge”.
 Never pull an electrical plug out by tugging the lead. Make sure the lead is not bent at
a sharp angle and that it does not rub against any sharp edges. Use of extensions is
not advised.
 Never operate the compressor when:
 the power lead is damaged
 there is evident damage
 All routine and unscheduled maintenance tasks must be carried out with the
compressor at a standstill, the electrical power supply disconnected or locked out and
all lines are depressurized.
 After switching off the compressor wait about 30 minutes before carrying out any
maintenance tasks so as to prevent burns.
 The high pressure flex hose that connects to the bottle (also called the refill hose)
must be in good condition, especially in the areas near the fittings. The plastic sheath
that covers the hose must not show any signs of abrasion otherwise moisture could
get in and corrode the steel braid thus weakening it. The hose must be changed
periodically (yearly) or when it shows signs of wear. Failure to observe this rule could
seriously endanger the users’ safety. Make sure the minimum bending radius of the
hose is no less than 250 mm (1 inch).
To ensure maximum working efficiency, Nuvair has constructed the compressor with carefully
selected components and materials. The compressor is tested prior to delivery. Continued
compressor efficiency over time will also depend on proper use and maintenance as per the
instructions contained in this manual.
All the components, connections and controls used in its construction have been designed and built
to a high degree of safety so as to resist abnormal strain or in any case a strain greater than that
indicated in the manual. Materials are of the finest quality; their introduction and storage in the
company and their utilization in the workshop are controlled constantly so as to prevent any damage,
deterioration or malfunction.

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Before carrying out any work on the compressor, each operator must have a perfect
understanding of how the compressor works, know how to use the controls, and have read
the technical information contained in this manual.
 It is forbidden to use the compressor under conditions or for purposes other than those
indicated in this manual and Nuvair cannot be held liable for breakdowns, problems or
accidents caused by failure to observe this rule.
 Check that the fittings provide a proper seal by wetting them with soapy water: Stop the
compressor and eliminate any leaks immediately when detected.
 Do not attempt to repair high pressure tubes by welding them or while the compressor
is running.
 Do not empty the bottles completely, not even during winter storage as this practice
allows damp air to get in and eventually corrode the bottle.
 It is forbidden to tamper with, alter or modify, even partially, the systems and equipment
described in this instruction manual, especially as safety guards and safety symbols
are concerned.
 It is also forbidden to carry out work in any way other than that described or to neglect
the illustrated safety tasks.
 The safety information and the general information given in this manual are highly
important.
1.8 Where the Compressor may be used
The high pressure compressor model Open Vertical Electric has been designed and built for the
purpose of producing breathing air by drawing it from the surrounding environment. The
surrounding environment air must be free from any harmful fumes or contaminates. The air is
passed through an intake air filter, compressed and run through breathing air filtration before it is
stored in bottles constructed to contain air at high pressure. The compressor must only be used in
environments having the characteristics described in the following table:
Area of Machine Use: Essential Data Table
Temperature ambient Min. +41°F - Max. +113°F (Min. +5°C - Max. +45°C)
Air humidity Maximum 80%
rain
Tolerated Weather Conditions hail none
snow
Max tilt angle 6% grade (less than 4 deg.)
Check that the area in which the compressor is to be positioned is adequately ventilated:
good air exchange (more than one window) with no dust and no risk of explosion, corrosion or fire.
If ambient temperatures exceed 113°F (45°C) air conditioning will be required. Make sure that
lighting in the area is sufficient to identify every detail (such as the writing on the info
plates/stickers); use artificial lighting where daylight on its own is insufficient.

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1.9 Running and Testing the Compressor
Each compressor is carefully run and tested prior to delivery. A new compressor must
nevertheless be used with caution during the first 5 working hours so as to complete proper break-
in of its components. If the compressor is subject to an excessive workload during initial use, its
potential efficiency will be prematurely compromised and functionality soon reduced. During the
breaking in period proceed as follows:
 After starting up the compressor, let the compressor run un-loaded for 5-6 minutes.
After the first 50 hours:
 Change the compressor oil (and filter on Tropical models)
 Check and adjust nuts and bolts
 Check Drive Belt Tension
When changing the oil and filter, inspect for any metal debris; if present track down the cause
before restarting the compressor.
2.0 Safety Warnings
Nuvair has taken extreme care in providing you with the information you will need to operate this
system. However, it is up to you to carefully read this manual and make the appropriate decisions
about system safety.
This equipment is used to provide breathing Air for the purpose of life support. Read this
manual in its entirety. Failure to heed the warnings and cautions contained in this document
may result in severe injury or death.
The equipment you will be using to compress air will expose you to both low and high-
pressure gas. Gas, even under moderate pressures, can cause extreme bodily harm. Never
allow any gas stream to be directed at any part of your body.
Any pressurized hose can cause extreme harm if it comes loose or separates from its restraint
or connection while under pressure and strikes any part of your body. Use appropriate care in
making and handling all air connections.
Do not use any form of mineral oil or synthetic lubricant not rated for the compressor in this
system. Use only the recommended compressor lubricant. Never mix the Compressor
Lubricant with other lubricants. The use of improper lubricants can lead to fire or explosions,
which may cause serious personal injury or death.

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3.0 Safety And Operation Precautions
Because a compressor is a piece of machinery with moving and rotating parts, the same precautions
should be observed as with any piece of machinery of this type where carelessness in operations or
maintenance is hazardous to personnel. In addition to the many obvious safety precautions, those
listed below must also be observed:
1) Read all instructions completely before operating any compressor or Nitrox System.
2) For installation, follow all local electrical and safety codes, as well as the National Electrical Code
(NEC) and the Occupational Safety and Health Administration (OSHA) standards.
3) Electric motors must be securely and adequately grounded. This can be accomplished by wiring
with a grounded, metal-clad raceway system to the compressor starter; by using a separate
ground wire connected to the bare metal of the motor frame; or other suitable means.
4) Protect all power cables from coming in contact with sharp objects. Do not kink power cables and
never allow the cables to come in contact with oil, grease, hot surfaces, or chemicals.
5) Make certain that power source conforms to the requirements of your equipment.
6) Pull main electrical disconnect switch and disconnect any separate control lines, if used, before
attempting to work or perform maintenance. “Tag Out” or “Lock Out” all power sources.
7) Do not attempt to remove any parts without first relieving the entire system of pressure.
8) Do not attempt to service any part while System is in an operational mode.
9) Do not operate the System at pressures in excess of its rating.
10) Do not operate compressor at speeds in excess of its rating.
11) Periodically check all safety devices for proper operation. Do not change pressure setting or
restrict operation in any way.
12) Be sure no tools, rags or loose parts are left on the Compressor System.
13) Do not use flammable solvents for cleaning the Air Inlet Filters or elements and other parts.
14) Exercise cleanliness during maintenance and when making repairs. Keep dirt away from parts by
covering parts and exposed openings with clean cloth or Kraft paper.
15) Do not operate the compressor without guards, shields, and screens in place.
16) Do not install a shut-off valve in the compressor discharge line, unless a pressure relief valve, of
proper design and size, is installed in the line between the compressor unit and shut-off valve.
17) Do not operate in areas where there is a possibility of inhaling carbon monoxide, carbon dioxide,
nitrogen, or flammable or toxic fumes.
18) Be careful when touching the exterior of a recently run electric, gasoline, or diesel motor - it may
be hot enough to be painful or cause injury. With modern motors this condition is normal if
operated at rated load - modern motors are built to operate at higher temperatures.
19) Inspect unit daily to observe and correct any unsafe operating conditions found.
20) Do not “play around” with compressed air or direct air stream at body, this can cause injuries.
21) Compressed air from this machine absolutely must not be used for food processing or breathing
air without adequate downstream filters, purifiers and controls and periodic air quality testing.
22) Always use an air pressure-regulating device at the point of use, and do not use air pressure
greater than marked maximum pressure.
23) Check hoses for weak or worn conditions before each use and make certain that all connections
are secure.
The user of any compressor or Nitrox System manufactured by Nuvair is hereby warned that failure to
follow the preceding Safety and Operation Precautions can result in injuries or equipment damage.
However, Nuvair does not state as fact or does not mean to imply that the preceding list of Safety and
Operation Precautions is all-inclusive, and further that the observance of this list will prevent all
injuries or equipment damage.

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4.0 System Components
Standard Equipment
 Coltri MCH13 or MCH16 High Pressure Air Compressor
 3 Cylinder, 3 stage, Air Cooled
 Stainless Steel Interstage Cooling Tubes
 Electric Motor: 5.5 hp or 7.5 hp, 220 V, 230 V, or 440 V, 1 or 3 Phase,
50 or 60 Hz
 2 Condensate Separators
 1 Air Filtration Tower
 Oil Level Sight Gauge
 Loadless Start
 Powder Coated Aluminum Frame & Belt Guard
 Rubber Motor Plate Vibration Isolation Mounts
 Rubber Vibration Isolating Frame Feet
 Collapsible Carrying Handles
 Lubricant: Nuvair 455 Food Grade Lubricant
Optional:
 Tropical and Tropical Plus Compressors for high heat/humidity
applications
 Additional Filtration Tower
 Motor Starter
 Pre-set Pressure Shutdown Switch
 Dial-a-Pressure Set-able Shutdown Switch
 Stainless Steel Frame
 Hour Meter
 Automatic Condensate Drains (Auto Drains)
 Low Oil Shutdown Switch
 High Temp Shutdown Switch set at 350°F
 Inter-stage Pressure Gauges; Panel or Pump mount
 Visual CO / Moisture Indicator
 Frame Lifting Eyes
 Optional Lubricant: Nuvair 751 Diester Based Lubricant

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5.0 Component Identification
Manual Drain Valves
Powder Coated
A
luminum Frame
Motor Starter Box
with On/Off Switch
and Hour Meter
Pressure Regulator
for Auto Drains
Vibration Isolating
Motor Plate Mounts
Breathing Air Filter Tower
Filter p/n SC000440-MHC
Units Shown With
Optional Equipment
Inter-stage Pressure
Gauges
Auto Drains
Water and Oil
Se
p
arator Bod
y
Hour Meter
On/Off Switch

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The Tropical Block for High
Heat/Humidity Applications
utilizes an additional
coalescing tower and
cooling tubes for the first
compression stage
The Tropical Plus Block for
High Heat/Humidity
Applications offers the
same features as the
standard Tropical Block,
with the addition of a high
pressure oil pump and
cartridge type oil filter to aid
in lubrication and cooling

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6.0 Compressor Specifications
Model Open Vertical MCH13 Open Vertical MCH16
Fill Time*
Approx. 11 Minutes Approx. 9 Minutes
Charging Rate*
8.4 SCFM (238 L/min) 11.3 SCFM (320 L/min)
CFM FAD
7 CFM (200 L/min) 9.4 CFM (266 L/min)
208-230 V / E1 / 50 or
60Hz**
25 amps 5.5 hp (4 kW)
Model# 8040.1
34 amps 7.5 hp (5.5 kW)
Model# 8061.1
208-230 V / E3 / 50 or 60
Hz**
14 Amp 5.5 hp (4 kW)
Model# 8040.2
20 Amp 7.5 hp (5.5 kW)
Model# 8061.2
440-480 V / E3 / 60 Hz
7 Amp 5.5 hp (4 kW)
Model# 8040.3
10 Amp 7.5 hp (5.5 kW)
Model# 8061.3
RPM
1200 1450
Sound Level @ 3 Meters
81 dB 80-96 dB
Max Operating Pressure
5000 psi (345 bar)
Number of Stages 3
Number of Fill Hoses
1-2
Condensate Drain Manual (Auto Drain Optional)
Dimensions (L x W x H)
32 x 36 x 52 in (81 x 91 x 132 cm)
Weight
410-420 lbs (186-191 kg)
Lubrication
Splash lubrication, capacity 1.8 L
Air Quality
DIN 3188 - CGA Grade E - NFPA 1500 - EN12021
*Based on 80 cu ft cylinder from 500 to 3000 psi. **Model based on 60 Hz models, for information on 50 Hz models, contact Nuvair.
Ambient room temperature should never exceed 113
o
F (45
o
C) during operation of the
Compressor System. Operation at higher temperatures may lead to system damage and
malfunction.

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7.0 Unpacking and Installing
1) Please read all information supplied before physically installing the Compressor System.
2) Unpack the system and remove from the pallet. Visually inspect the system to make sure there has
been no damage during shipping. If damaged, please call Nuvair to file a damage report. Please
take photos and supply detailed information about the damage.
3) Place the system in a permanent location allowing a minimum spacing of 36” from adjacent walls.
Select a location where ambient room temperature is a minimum of +41°F to a maximum +113°F
(°C Min. +5° - Max. +45°).
4) Make sure the installation space is well ventilated.
7.1 Electrical Connection (see section 15.0 for electrical specs)
 Please read all information supplied before Connecting Electricity to the Compressor System.
 You should hire a licensed electrician to install any electric compressors purchased from
Nuvair.
 The compressor is delivered with raw leads ready to be installed into a junction box.
 In the event a plug is needed, Nuvair recommends that the licensed electrician doing the install
determines the plug necessary.
 Make sure your electrician follows approved and compliant standards for your location.
8.0 Daily Checks
 Inspect the exterior of the compressor (couplings, pipes, pneumatic
components etc.)
 Check for any oil leaks.
 Replace parts where necessary or contact Nuvair
8.1 Lubricating Oil Level Check
Check that the level of lubricating oil is within acceptable limits (i.e. between min. and max.). Note
that an excessive quantity of oil can leave deposits on the valves while too low a level prevents
proper lubrication and could cause engine seizure. If the oil level is not within the minimum and
maximum limits top up or drain as described in section 15.1.
8.2 Check that Fill Hoses are in good condition
Inspect the refill hoses and make sure there are no cuts, holes, abrasions, leaks etc. If necessary
replace with new hoses.
9.0 Storing Technical Documentation
The use and maintenance manual and its appendices must be stored carefully and must always be
kept where they can be accessed easily for immediate review.
This User Manual contains important safety information and should always be available to
those personnel operating this equipment. Read, understand and retain all instructions before
operating this equipment to prevent injury or equipment damage.

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10.0 Gauges
10.1 Fill Pressure Gauge- Pressure at the fill whip.
10.2 Optional Interstage Pressure Gauges
Fill
Pressure Gauge
3
r
d
, 2nd, 1s
t
, Sta
g
e Pressures

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11.0 Safety Valve Checks
Check that safety valves are working properly by starting the compressor with the end taps
closed: this will raise circuit pressure fast and trip the valves when their pressure setting is
reached. The valves are pre-adjusted to 3200 psi (225 bar), 4300 psi (300bar), 4700 psi
(330bar) or 6000 psi (425 bar).
Note: This check will not be possible if you have a factory set pressure switch installed.
Tampering with the safety valve to increase the pressure setting is strictly forbidden.
Tampering with the safety valve can seriously damage the compressor, cause serious injury
to personnel and renders the warranty null and void.
12.0 Bottle Refill
To refill the bottles proceed as follows:
- Fit the hose connector (a) to the tank valve (b)
- Screw in the fixing knob (c) until it is completely
tightened
- Check that the bleed valve (f) is closed by
rotating it clockwise
- Open the valve (d) by rotating it counter clockwise
- Open the valve (e) by rotating it counter clockwise
- Start the compressor
- When the refill has been completed the compressor
shuts down automatically
- Close valves (d) and (e) by rotating them clockwise
- Open the bleed valve (f) by rotating it counter clockwise
until all the residual air in the fitting has been expelled
- Unscrew the fixing knob (c) by rotating it counter clockwise
- Disconnect the bottle coupling.
Options for this compressor that may or may not be installed are:
 Pressure Switch: Shuts down the compressor at a set pressure
 Dial-a-Pressure Switch: Allows the operator to select a pressure for the compressor to
automatically shut off at when the pressure is reached during the filling process.
Fill Whip connection
point on compressor
Pressure Switch

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During refill the operator must be in the work area. It is advisable, during the bottle refill
phase, to submerge the bottles in cold water so as to reduce the drop in pressure that
accompanies cooling of the bottle.
During bottle refill those not involved in the refill procedure must maintain a safety distance of
at least 9 feet (3 meters). Also, it is forbidden to disconnect the hoses from the fittings or the
refill tap while the machine is under pressure.
Should bottles show evident signs of internal or external corrosion, do not refill them even if
they have been tested.
Use only tested bottles (as proven by a test stamp and/or certificate). The working and bottle
refill pressures are shown on the bottles themselves. It is forbidden to refill them at a pressure
greater than that indicated.