Nuvair Quincy 390 User manual

www.nuvair.com
User Manual
Quincy 390 / Coltri MCH 36
Electric
Nitrox System
REV: 03.19

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 2
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: [e-mail]
Hours: Monday through Friday
8:00 AM to 5:00 PM PST USA
If you lose this manual, you can download the latest version at www.nuvair.com.
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.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 3
Table of Contents
Introduction
1.0 Introduction ..................................................................................................................................... 4
2.0 Safety Warnings and Warning Graphics Defined............................................................................. 5
3.0 Safety and Operation Precautions ................................................................................................... 7
4.0 Legal Precautions ............................................................................................................................ 8
5.0 Theory of Operation ........................................................................................................................ 9
6.0 Low Pressure Air Compressor Technical Data …………………………………………………………. 10
7.0 High Pressure Compressor Technical Data ………………………………………..…………..…........ 11
8.0 System Components ………………………………………...........…………………………………….....12
9.0 Nitrox System Specifications ............................................................................................................13
10.0 Nitrox System Component Identification……………...…………........................................................ 14
11.0 System Drawing/Schematic …………………………………………….………………………………….17
12.0 System Flow Chart ……………………………………………………………………………………….… 18
Setup, Operation, and Maintenance
13.0 Installing the Nitrox System ……………........................................................................................... 19
13.1 Precautions ......................................................................................................................... 19
13.2 Attaching Nitrogen Discharge Hose (Optional) ................................................................... 19
13.3 Electrical Power Connection .............................................................................................. 20
13.4 Check Compressor Lubricant Levels …………………………………………………………… 21
13.5 Control Panel Identification……………………………………………………………………….21
14.0 Pre-Operation Instructions ............................................................................................................... 22
14.1 Oxygen Analyzer Calibration............................................................................................... 22
15.0 Producing nitrox ............................................................................................................................... 24
15.1 Flow to Membrane and Setting Proper Pressure................................................................ 24
15.2 Final Adjustments Before Pumping Nitrox ......................................................................... 24
15.3 Pumping Nitrox ................................................................................................................... 26
15.4 Pumping Air ......................................................................................................................... 28
15.5 Shutting Down ..................................................................................................................... 28
16.0 Nitrox Operational Notes .................................................................................................................. 29
16.1 Correlation of Feed Air Pressure to Oxygen Content .......................................................... 29
16.2 Hot Fills ............................................................................................................................... 29
17.0 Maintenance ..................................................................................................................................... 30
17.1 Daily Maintenance ............................................................................................................... 30
17.2 Routine Maintenance .......................................................................................................... 31
17.3 Compressor lubricant .......................................................................................................... 32
17.4 LP Feed Air Filtration and Bowls........................................................................................ 34
17.5 LP Filtration Inspection …………………………………………………………………………. 34
17.6 Changing LP Filtration Elements ……………………………………………………………… 35
17.7 HP Compressor Filtration .............……………………………............................................. 36
18.0 Spare Parts List …………................................................................................................................. 37
19.0 Service Record Log ......................................................................................................................... 38
20.0 Appendix .......................................................................................................................................... 39
20.1 Supply and Breathing Air Specifications ..............................................................................39
20.2 Filter Element Life Factors .................................................................................................. 39
Material Safety Data Sheets ............................................................................................................ 40
Owner’s Warranty Responsibilities ………………………………....................................................... 43
Warranty …………………………………………………………………………………………………….. 42
Additional Record of Changes ……………………………………………………………………………. 43
Separate Manuals Included:
Nuvair Pro O2TM Oxygen Analyzer Operation Manual
Coltri MCH-36 High Pressure Compressor Manual

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 4
1.0 Introduction
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 manual will assist you in the proper set-up, operation and maintenance of the Nuvair nitrox
system. Be sure to read the entire manual.
Throughout this manual we will use certain words and symbols to call your attention to conditions,
practices, and / 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.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 5
2.0 Safety Warnings
This equipment is used to provide breathing gas for the purpose of underwater 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 manufacture nitrox (oxygen rich 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 termination) while under pressure and strikes any part of your body. Use appropriate care
in making and handling all gas connections.
Pure nitrogen is a colorless, odorless, tasteless gas that will not support life.
Breathing gas mixtures containing more than 84% nitrogen at surface pressures
will lead to unconsciousness and may cause death.
The nitrogen discharge from the membrane system must be vented to the
exterior of any closed building, boat, or similar enclosed space. Breathing gas
mixtures containing more than 84% nitrogen at surface pressure will lead to
unconsciousness and may cause death.
Do not use any form of mineral oil or synthetic lubricant not rated for nitrox in
any compressor in this system. Use only the recommended nitrox compressor
lubricant. Never mix the nitrox compressor lubricant with other lubricants.
Remove all existing lubricant and replace with the proper nitrox compressor lubricant prior to
installing the membrane system. The use of improper lubricants can lead to fire or explosions,
which may cause serious personal injury or death.
Do not use this system to produce nitrox mixtures containing more than 40%
oxygen. Pumping nitrox mixtures with higher concentrations of oxygen may
lead to fires or explosions, which can cause serious personal injury or death.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 6
The use of enriched air nitrox does not eliminate the risk of decompression sickness (DCS) in
diving. Decompression sickness can lead to permanent disability or death.
Do not pump nitrox mixtures at pressures above the HP compressor
manufacturer’s rating, and never above 3600 psi (250 bar). The system is not
rated for pressures above 3600 psi (250 bar). Higher pressures may lead to
explosions which may cause serious personal injury or death.
Ambient room temperature should never exceed 104o F (40o C) during operation of the nitrox
system. Operation at higher temperatures may lead to system damage and malfunction. A
damaged membrane will not produce the correct nitrox mixture which can lead to severe
personal injury if the gas is used for diving purposes without proper analysis.
Warnings Graphics Defined:
Moving belts Electrocution Fire Eye protection Gas inhalation
Skin damage Explosion Explosion Electrocution Machinery
Abbreviations commonly used in this manual:
PSI Pounds Per Square Inch CFM Cubic Feet per Minute
HP High Pressure RPM . Rotations per Minute
LP Low Pressure PPM Parts Per Million
O2Oxygen L/min Liters Per Minute
CO Carbon Monoxide O2% Oxygen Percentage of Gas
CO2Carbon Dioxide B.P. Back Pressure
N Nitrogen

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 7
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” and “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 nitrox 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 this compressor in any location where there is a possibility of toxic levels of carbon
monoxide (CO), carbon dioxide (CO2), nitrogen (N), or any flammable or toxic fumes being sucked into
the compressor intake.
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, because 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.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 8
4.0 Legal Precautions
It is highly recommended that a nitrox fill log be maintained when filling scuba cylinders to document
the following information. This log must be of permanent binding style with no loose pages.
•Fill date and time of day
•Tank serial number
•Supplier’s check of oxygen content O2% plus signature and date
•User’s check of oxygen content O2% plus signature and date
•Fill pressure
•MOD (maximum operating depth) in user’s handwriting
•Nitrox certifying agency and card number

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 9
5.0 Theory of Operation
The Nuvair high pressure nitrox system is a turnkey package that produces oxygen-rich air (nitrox)
and then compresses it with a High Pressure (HP) compressor to fill scuba tanks or storage cylinders.
The package is designed to be fully automatic. Although it is described as the “nitrox compressor”, it
can also be used to pump air.
This nitrox system allows for efficient and cost effective nitrox production using electric power, without
the hazards or expense of blending with stored high-pressure oxygen (O2). Instead, the system uses
a semi-permeable membrane to produce nitrox from air. A portion of the nitrogen in air is separated
out, leaving an oxygen rich nitrox mixture.
This system uses a Quincy LP compressor, air aftercooler, and filtration to provide the membrane
system with a source of clean, pressurized feed air for separation. The air is filtered to CGA Grade D
or better air quality prior to entering the membrane system so it will not damage or plug the
membrane fibers. Specifications for Grade D air are provided in the appendix.
The Package’s membrane system is rated for a maximum feed air pressure of 300 psi (21 bar) and
has been configured to work well with the 175 P.S.I (12 bar) maximum pressure delivered by the LP
compressor. A back-pressure regulator is used to adjust the amount of air the Quincy compressor
produces to meet the appropriate levels for various O2% nitrox production. The air is then heated to a
temperature that provides stability over a wide range of ambient conditions, is optimal for membrane
permeation, and prevents moisture condensation.
The heated air enters the membrane, which is made up of thousands of miniature hollow fibers. The
walls of these fibers are semi-permeable and designed for different gases to move through them (or
permeate) at different speeds. The resulting gas mixture is known as the “permeate.” As air flows
through the hollow fibers, both oxygen and nitrogen permeate through the fiber walls. The oxygen
permeates faster than the nitrogen, which produces permeate with oxygen content greater than air.
The gas that reaches the end of the hollow fibers without permeating is almost entirely nitrogen and is
discharged. The flow rate of this discharge is set by the factory via a fixed orifice, which controls the
permeate.
The permeate is a concentrated mixture that is diluted with air prior to entering the HP compressor. It
exits the membrane at ambient to slightly negative pressure and travels into the mixing tube, where it
mixes homogeneously with filtered outside air. The amount of dilution, and thus final O2%, is
obtained by adjusting the amount of air produced by the compressor and supplied to the membrane,
with the back pressure regulator. As air flow to the membrane is increased, permeate flow increases
and a higher O2% nitrox is produced. As air flow to the membrane is decreased, permeate flow
decreases, compressor intake air increases, and a lower O2% nitrox is produced.
This relationship between permeate flow and intake air flow exists because the total of these two flow
rates will always equal the intake flow rate demanded by the HP compressor. The resulting nitrox
mixture is analyzed for O2% before entering the HP compressor for approximate content and again
when pumping nitrox for precise content. The HP compressor pumps the nitrox to a maximum
pressure of 3600 psi (250 bar) to fill scuba tanks or storage cylinders.
A unique feature of Nuvair nitrox systems is that the feed air pressure that correlates to a specific
nitrox O2% is repeatable. For example, if your HP compressor pumps 36% O2when the feed air
pressure is at 125 psi (9 bar), then adjusting the back pressure regulator to 125 psi (9 bar) during the
next use will produce the same mixture.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 10
6.0 Low Pressure Compressor Technical Data
See separate manual for Quincy QR-390 LP compressor
Capacity and Power Consumption:
•Normal working pressure: 125-175 psi
•Capacity at normal working pressure: 69 (C.F.M.) cubic feet per minute (1950 l/min)
•Shaft power at normal working pressure: 20 horse power (15 kW)
•Maximum working pressure: 175 psi (12 bar)
•Transmission: belt drive
Cooling:
•Allowed ambient temperature: 32-104° F (0-40° C)
Motor and Electrical Values:
•Motor: F class TEFC, 20 horse power (15 kW) three phase
•Speed of rotation: 3450 RPM @ 60Hz or 2850 RPM @ 50Hz
•Compressor current:440 V 50 or 60 Hz three phase – 27 Amps
•Control voltage: 230 V
General Technical Data:
•Oil capacity:9 Quarts – 16 Ounces (9 liters)
•Maximum oil content in air: 3 mg/m3

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 11
7.0 High Pressure Compressor Technical Data
See separate manual for Coltri MCH 36 HP compressor
Capacity and Power Consumption:
•Normal working pressure : 3600 psi (250 bar)
•Free air delivery flow: 22 CFM (623 l/min)
•Charging rate: 26.4 SCFM (750 l/min)
•Compressor speed of rotation: 1115 RPM
•Maximum working pressure air: 6000 psi (425 bar), nitrox 3600 psi (250 bar)
•Transmission: belt drive
Cooling:
•Allowed ambient temperature:32-104° F (0-40° C)
•Air cooled Interstage & aftercooler
Motor and Electrical Values:
•Motor: F class TEFC, 20 horse power (15 kW) three phase
•Speed of rotation: 3450 RPM @ 60 Hz or 2850 RPM @ 50Hz
•Compressor current: 440V 50 or 60 Hz three phase – 27 Amps
•Control voltage: 230 V
General Technical Data:
•Number of stages: 4
•Number of cylinders: 4
•Lubrication: pressure & splash lubricated
•Oil capacity: 4.25 qt. (5 liters)
•HP filtration rating: CGA Grade E, 60,000 cu. ft. at 68o F (20o C)
(see page 39 for filtration factor chart)
•Condensate drains: automatic & manual interstage & final
•Fill Pressure Stop: automatic & manual
•Low oil level auto shutdown
•Interstage pressure gauges

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 12
8.0 System Components
•Low pressure compressor, including:
♦Soft start motor starter
♦Hour meter
♦External lubricant dip stick, fill, and drain
♦Nuvair 455 food grade compressor lubricant (see MSDS starting on page 40)
♦Large air aftercooler
•Back-pressure regulator that controls LP compressor feed air supply
♦Supply air pressure regulated between 90-175 psi (6-12 bar) depending on nitrox O2%
•Low pressure feed air filtration, Grade D breathing air, including four stages:
♦Coalescing & particle removal to 1 micron, auto drain, liquid level indicator
♦Water & oil vapor removal to 0.01 micron, auto drain, liquid level & service life indicators
♦Oil vapor removal to 0.003 PPM
•Heater including:
♦Thermostat control
♦Digital temperature gauge
♦Pressure switch
♦200 psi (14 bar) ASME over pressure relief
•Semi-permeable membrane
•Mixing tube & air intake filter
•Nuvair Pro O2Remote permeate oxygen analyzer
•Nitrogen discharge
•Nuvair Pro 4 Warn O2, CO, CO2analyzers and H2O Moisture Monitor, High Temp warning
including:
♦High Pressure/Low Pressure regulator
♦Flow Meter, 1 - 10 L/Min
•High pressure compressor, including
♦Soft start motor starter
♦Hour meter
♦Automatic condensate drains
♦Automatic fill pressure stop
♦External lubricant sight gauge, fill, and drain
♦Compressor lubricant see page see MSDS page 40
•High pressure filtration, Grade E breathing air (see page 39 for filtration factor chart)
•Air/nitrox quality analysis kit

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 13
9.0 Nitrox System Specifications
LP
Compressor
Delivery @ 175 psi (12 bar) 69 C.F.M. free air (1950 L/min)
Horse Power –
Electric 20 horse power
(15 kW)
Physical
Specifications
Height 90 in (229 cm)
Width 63 in (160 cm)
Length 96 in (244 cm)
Weight 3800 lb (1724 kg)
Full Load Amps
System
440V / E3 / 50 or 60 Hz 54 Amps
Membrane Input
Operating Pressure Range 90 -175 psi (6-12 bar)
Maximum Input Pressure 300 psi (21 bar)
Feed Air Volume Range 13 - 60 SCFM (354 -1700 L/min)
LP Feed Air Quality Grade D
Optimum Temperature 110 +/- 5o F (43 +/- 3o C)
Nitrox O2%Range 24 - 40%
HP
Compressor
Charging Rate 26.4 SCFM (750 L/min)
Horse Power –
Electric 20 horse power
(15 kW)

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 14
10.0 Q-390/MCH 36 Nitrox System Component Identification
LP Compressor
Intake Filter
LP Oil Drain
LP Oil Filter
LP Oil
Check and
Fill Port
Compressor
Control
Panels
Volume
Tank
LP Quincy
390
HP Coltri
MCH36
HP Compressor
Intake Plumbed
to Membrane
HP Auto
Drains
HP Oil
Drain
HP Oil Fill Port
HP Oil Gauge
HP Motor Control
Electric Box
HP Motor

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 15
LP Feed Air
Filtration
(4 Stage)
LP Motor
Control Electric
Box
Membrane
Heater
HP compressor
filter canisters
HP compressor
Moisture
Separator
Condensate
Container with
Muffler & Drain
Power cable for
total package
LP Compressor
Aftercooler
Electric
Transformer
Volume
Tank
LP Electric Motor
HP & LP Collective
Condensate Drain
Ball Valve

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 16
Control Panel
Stage
Pressure
Gauges
LP Back Pressure
Regulator Adjustment
Knob - Adjust Nitrox
O
2
% Here
Heater
Thermostat
Control
Permeate
Oxygen
Analyzer
Fill
Pressure
Gauge
HP Oil
Pressure
On/Off
Valve
Membrane
Feed
Pressure
Gauge
Fill
Pressure
Gauge
On/Off
Valve
LP Tank
Pressure
Gauge
Dump
Valve for
O2%
adjustment
Flow Meter
4LPM Max.
High Pressure
Compressor On/Off
Switch & Hour
Meter
Low Pressure
Compressor
On/Off Switch &
Hour Meter
Dial-A-
Pressure Fill
Gauge
Emergency
Stop LP
Compressor
Emergency
Stop HP
Compressor
Pro 4 Warn
Multi Gas Monitor
Gas flow switch
for Monitoring
LP or HP Gas

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 17
Q390/MCH36
nitrox system Components
Shown Within Dashed Lines
11.0 System Drawing / Schematic

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 18
12.0 System Flow Chart
LP aftercooler removes
moisture
LP feed air filtration
produces Grade D air
B.P./ LP regulator controls
the amount of feed air
pumped by the
compressor. Reducing
Pressure Adjusts to
Desired Nitrox %
Thermostat controlled heater
heats air to 110ºF (43ºC)
Membrane separates supply
air into permeate and
nitrogen rich gas
Permeate exits membrane
Nitrogen rich gas exits
through fixed orifice
located by exhaust cooling
air vent
Mixing tube mixes air &
permeate to create nitrox
containing 24-40% O2
Air intake delivers filtered
ambient air to mixing tube
Permeate O
2
analyzer
monitors nitrox before
compression to +/- 2% O2
HP compressor with
moisture removal & filtration
compresses nitrox
Fill diver O
2
analyzer monitors
nitrox mixture to +/- 1% O2
HP nitrox delivered to
storage
HP nitrox delivered to
scuba cylinder
- OR -
Optional vacuum pump or
blower
LP compressor produces LP
feed air (supply air)
LP Volume Tank Collects
Moisture and Delivers
Feed Air
Nitrox system components
shown within dashed lines

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Q-390/MCH36 Nitrox system User Manual Page 19
13.0 Installing the Q-390/MCH36 Nitrox System
If any information in this manual conflicts with any of the other manuals call Nuvair before
proceeding.
The Nuvair System should never be operated in a facility where the room temperature exceeds
104o F (40o C) while the system is in use. Operation at higher temperatures may lead to system
damage and malfunction. A damaged membrane will not produce the correct nitrox mixture
which can lead to severe personal injury if the gas is used for diving purposes without proper
analysis.
13.1 Precautions
1. Please read all information supplied before physically installing the nitrox 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 location that allows a minimum spacing of 18 inches from adjacent walls.
Select a location where ambient room temperature will never exceed 104o F (40o C).
4. The heater thermostat has been set in the factory. Do not
adjust.
13.2 Attaching Nitrogen Discharge Hose (option)
The nitrogen discharge from the membrane on the system exits
at the fitting in the picture. The open frame should not require a
discharge hose, unless installed in an improperly vented room.
Pure nitrogen is a colorless, odorless, tasteless gas that will not support life.
Breathing gas mixtures containing more than 84% nitrogen at surface
pressures will lead to unconsciousness and may cause death.
The nitrogen discharge from the membrane should be vented to a well-
ventilated room or to open air with good circulation. Failure to isolate the
discharge from the air intake of the membrane system or LP compressor could
lead to incorrect nitrox mixtures, resulting in serious personal injury or death.
If you allow this pure nitrogen to accumulate in an enclosed space, anyone entering this
space will quickly lose consciousness and will die if not immediately resuscitated.

Q-390/MCH 36Electric Nitrox System
NUVAIR
Q-390/MCH36 Nitrox system User Manual Page 20
13.3 Electrical Power Connection
Never use extension cords to provide power to your nitrox system. The system
must be properly wired according to national and local electrical codes by a
qualified electrician. Improper wiring may lead to fires, which can cause serious
personal injury or death.
The electrical power to the Nuvair Nitrox System must be off while wiring this
system for service. Failure to ensure that the electrical power is off can lead to
severe personal injury and death by electrocution.
Prior to making the electrical power connection, check all system specifications provided in this
manual. When working on the nitrox system, the main breaker at the power source must be “locked
out” and “tagged out” in the “Off” position. The nitrox system has electrical protection for the
compressor Motor and membrane system Heater located inside the motor starter compartment.
Amperage Load for System
♦Approximately 54 Amps for 440 V three phase service
Compressor Rotation Check
Always turn on (bump) starter for both LP and HP compressors and run motor very briefly to check for
proper direction of rotation (see arrow on belt guard and flywheel).
Operation in reverse direction for extended periods of time will cause a reciprocating
compressor to run hot and perform poorly and may cause permanent damage. Reverse
rotation for a rotary screw compressor for even a short period of time will cause damage.
Note Proper Direction
of Rotation
HP On/Off
Switch
HP compressor Shown
LP Hour
Meter
HP Hour
Meter
LP On/Off
Switch