RIX Industries RIX 2V3B-4.1V Series User manual

4900 Industrial Way, Benicia, CA 94510 | www.rixindustries.com | 707.747.5900
MAN‐2V3B‐4.1V‐P1 
OperatingInstructions
ForRIXCompressorFamily:2V3B‐4.1V
Models:2V3B‐4.1V‐P1A,‐P1B,‐P1C,&‐P1E


RIXIndustries
3Stage,Oil‐Free
Air‐Cooled
OxygenCompressor



This manual, including information and products referenced herein, to be provided by Seller
(“Products”) are subject to U.S. export control laws and will not be resold, re-exported, or
retransferred, directly or indirectly, to any person in violation of U.S. Export Administration
Regulations.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Pagei
REVISIONHISTORY
RevisionDateByPages
Revised
BriefDescription
- 1/12/12 CJC Initial Release
A 12/5/12 SS 34
Revised 236 thru 239 to reflect new
part numbers that do not have rivet
holes. Added 289, Hand-Off-Auto
label.
B 7/6/16 GH 9 Updated Scheduled Maintenance
Section 5.2
C 03/14/18 AM 28 Guide cylinder nut torque reduced to
19 ft-lbs.
D 02/03/20 SF 29, 30
Removed valve assembly XAO15-
A5759-1. Updated items 1.2, 19, 20.
E 04/22/20 AM/ICB i-vi, 31 ECN 17822: Formatting Changes
F 06/16/21 ICB Appendix ECO-010722: Parts List Update
G 11/15/21 AV Title Page, viii,
1, 36, 54 ECO-011491
H 12/6/21 AV Appendix ECO-011546
I 02/16/22 AV Appendix New Rev of Interface Drawing
J 03/11/22 AV 54, Appendix New Rev of Interface Drawing,
Changed Overload Setpoint

RIXIndustriesMAN‐2V3B‐4.1V‐P1Pageii
TABLEOFCONTENTS
PARTS, SERVICE & TECHNICAL SUPPORT .................................................................................................................. iv
SAFETY PRECAUTIONS..........................................................................................................................................................v
OXYGEN COMPATIBILITY REQUIREMENTS ............................................................................................................... vi
COMPRESSOR WARRANTY ...............................................................................................................................................vii
COMPRESSOR SPECIFICATIONS ....................................................................................................................................viii
CHAPTER 1: COMPRESSOR OVERVIEW......................................................................................................................... 1
1.1DESCRIPTION.................................................................................................................................................... 1
1.2GAS COMPRESSION ........................................................................................................................................ 1
1.3GAS FLOW........................................................................................................................................................... 1
1.4COOLING ............................................................................................................................................................. 1
1.5CRANKCASE LUBRICATION........................................................................................................................ 1
CHAPTER 2: INSTALLATION .............................................................................................................................................. 2
2.1MOUNTING......................................................................................................................................................... 2
2.2GAS PLUMBING ................................................................................................................................................ 2
2.3CRANKCASE LUBRICATION........................................................................................................................ 2
2.4ELECTRICAL CONNECTIONS...................................................................................................................... 3
2.5STORAGE............................................................................................................................................................. 3
CHAPTER 3: START-UP AND OPERATING PARAMETERS ..................................................................................... 4
3.1SYSTEM CHECKOUT....................................................................................................................................... 4
3.3START-UP ........................................................................................................................................................... 4
3.4NORMAL OPERATING PRESSURE RANGES: ........................................................................................ 5
3.5RELIEF VALVE SETTINGS ............................................................................................................................ 5
CHAPTER 4: CONTROL SYSTEM AND UNLOADED STARTUP............................................................................... 6
4.1SAFETY SWITCH SETTINGS........................................................................................................................ 6
4.2CONTROL SYSTEM.......................................................................................................................................... 6
CHAPTER 5: ROUTINE INSPECTION AND SCHEDULED MAINTENANCE ........................................................ 8
5.1ROUTINE INSPECTION.................................................................................................................................. 8
5.2 SCHEDULED MAINTENANCE ..................................................................................................................... 9
5.3FILTER ................................................................................................................................................................. 9
5.4CRANKCASE LUBRICATING OIL................................................................................................................ 9
5.5MOTOR LUBRICATION.................................................................................................................................. 9
5.6DRIVE BELTS..................................................................................................................................................... 9
5.7PRESSURE RELIEF VALVES.......................................................................................................................10
5.8GAS PIPING LEAK CHECK ..........................................................................................................................10
5.9VALVES ..............................................................................................................................................................10
5.10PISTON RINGS.................................................................................................................................................11
5.11CYLINDER LINERS ........................................................................................................................................11
5.12PISTON ROD OIL SEALS..............................................................................................................................12
CHAPTER 6: TROUBLESHOOTING .................................................................................................................................13
CHAPTER 7: CORRECTIVE MAINTENANCE ...............................................................................................................14
7.1ALIGNMENT OF DRIVE PULLEYS ...........................................................................................................14
7.2TIGHTENING V-BELTS ................................................................................................................................14
7.3CYLINDER HEADS .........................................................................................................................................15
7.4COMPRESSOR VALVES................................................................................................................................15

RIXIndustriesMAN‐2V3B‐4.1V‐P1Pageiii
7.4.11ST STAGE VALVE ASSEMBLY............................................................................................................16
7.4.22ND STAGE VALVE ASSEMBLY...........................................................................................................16
7.4.33RD STAGE VALVE ASSEMBLY...........................................................................................................17
7.5CYLINDERS.......................................................................................................................................................18
7.6PISTON RINGS.................................................................................................................................................19
7.6.1REPLACE PISTON RING - FIXED PISTON - 1ST STAGE .............................................................19
7.6.2REPLACE PISTON RING - FIXED PISTON – 2ND STAGE ...........................................................19
7.6.3REPLACE PISTON RING - FLOATING PISTON - 3RD STAGE..................................................20
7.7PISTON RODS & OIL WIPER SEALS .......................................................................................................21
7.7.1INSTALL PISTON ROD AND OIL SEALS ...........................................................................................21
7.8PISTON ROD ADJUSTMENT ......................................................................................................................21
7.9CRANKSHAFT SHAFT SEAL.......................................................................................................................22
7.10GUIDE CYLINDERS........................................................................................................................................22
7.11CONNECTING RODS .....................................................................................................................................23
7.12MAIN BEARINGS............................................................................................................................................24
CHAPTER 8: CLEARANCES & TOLERANCES ..............................................................................................................26
CHAPTER 9: SPECIFIED TORQUES.................................................................................................................................27
APPENDIX.................................................................................................................................................................................28


RIXIndustriesMAN‐2V3B‐4.1V‐P1Pageiv
PARTS,SERVICE&TECHNICALSUPPORT

Manufacturer:RIXIndustries
4900IndustrialWay
Benicia,California94510USA
Phone:707‐747‐5900
Fax:707‐747‐9200
PartsFax:707‐748‐0398
www.rixindustries.com/request‐spare‐parts/
Parts Dept. Hours: 6:30-15:30 PST
Compressormodelandserialnumbermustbeprovidedwithallinquiries.

NOTE
Parts recommended for routine service are indicated in the parts lists. The customer is advised to
maintain these parts at their facility or procure them in advance as lead times and availability can
vary. RIX also offers service and overhaul kits to support other scheduled maintenance
requirements.
COMPRESSORIDENTIFICATION

Please record the information indicated below to provide in communication with RIX about parts,
service, warranty claims, or any other information related to this compressor.
Compressor Model Type
2V3B-4.1V
Location of Service
Serial Number Application
Lot Number Date of Shipmen
t
Date in Operation
RIX is an AS9100C:ISO9001-2008 registered company. All compressors are designed and
manufactured in accordance with the requirements of the AS9100C:ISO9001-2008 quality system
ensuring the highest quality products.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Pagev
SAFETYPRECAUTIONS

Priortoinstalling,operating,troubleshooting,orrepairinganypartofthiscompressor,all
precautionsstatedinthismanualshouldbereviewedandunderstood.Failuretoobserve
safetyprecautionsmayresultindamagetoequipmentorseriousinjuryand/ordeathto
personnel.

Danger
Thissymbolmeansifthedangerisnotavoided,itwillcausedeath,serious
bodilyinjury,orseveredamagetothemachine.
1. Before working on the compressor, all internal pressure must be relieved and compressor
must be isolated or disconnected from all external pressure sources.
2. All electrical components associated with this equipment shall be installed and grounded in
accordance with applicable codes and regulations.
3. Before working on electrical equipment, take steps to ensure system is de-energized and
will remain so while work is in progress. All circuits not known to be DEAD must be
considered LIVE and dangerous at all times.

Warning
Thissymbolmeansifthewarningisnotheeded,itcancausedeath,bodily
injury,ordamagetothemachine.
1. Do not operate unit if safety guards are removed, damaged, or modified.
2. Do not reset relief valves or pressure switch for any pressure higher than as specified in the
service manual.
3. Do not make any unauthorized alteration or modifications to the equipment.
Caution
Thissymbolmeansifprecautionisnottaken,itmaycausebodilyinjuryor
damagetothemachine.
4. Do not touch cylinder heads or the discharge gas lines during operation. Allow compressor
to cool prior to preforming service.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Pagevi
OXYGENCOMPATIBILITYREQUIREMENTS

DANGER 
To prevent FIRE,SERIOUSINJURYorDEATH, it is the User’s
responsibility to ensure that all oxygen wetted parts used in the
compressor are cleaned for oxygen service prior to installation.
Oxygen compression equipment has very stringent requirements due to the hazards inherent in the
compression process. Cleaning and handling must be in accordance with Compressed Gas
AssociationpublicationCGAG‐4.1, Cleaning Equipment for Oxygen Service.www.cganet.com.Any
work to be done on the compressor where the gas stream may be exposed must be done in
accordance with CGA procedures. RIX recommends that all maintenance be performed by qualified
personnel with full knowledge of oxygen equipment handling procedures and the potential hazards
of contamination. RIX further recommends returning the compressor package to RIX Industries or
RIX-approved service center when servicing or repairing this compressor package.
All gas plumbing and storage systems connected to the compressor must be oxygen clean,
constructed of oxygen compatible materials, and designed to safely handle the operating and design
pressures as defined in the registration page of this manual. Use only oxygen compatible O-ring
grease, such as RIX P/N 45-1007, and either Viton or Teflon O-rings in gas piping areas.
Factory cleaned oxygen parts are denoted by an “X” prefix at the beginning of the part number. It is
the User’s responsibility to maintain the cleanliness of factory cleaned parts and any existing
portions of the gas stream that may be exposed during installation or maintenance.
After any maintenance in which the gas stream of the unit becomes exposed, User should perform an
O2 burn-in, see Section3.2.During this time personnel should be separated from the compressor.



RIXIndustriesMAN‐2V3B‐4.1V‐P1Pagevii
COMPRESSORWARRANTY

RIXIndustrieswarrantsthiscompressorasfollows:

A. (FieldService/Overhaul)Exclusiveofnormalwearingparts‐Seller warrants that its work
when performed and services when rendered will meet all specific requirements, if any, of this
agreement, and will be done in a good and workmanlike manner. Seller warrants its work for a
period of 90 days from completion of the work and all claims for defective work must be made in
writing immediately upon discovery and in any event within 90 days from date of completion
thereof by Seller. Upon Buyer’s submission of a claim as provided above and its substantiation,
Seller shall at its option either (i) repair Buyer’s equipment at the original F.O.B. point of delivery,
(ii) refund an equitable portion of the contract price, (iii) furnish F.O.B. Seller’s facility or other
point of shipment any necessary repaired or replacement parts or, (iv) in the case of service, re-
perform the service.
B. (Parts/MaterialandNewEquipment) Exclusiveofnormalwearingparts‐Seller warrants
that any parts manufactured by Seller and delivered hereunder will be free from defects in material
and workmanship. Seller warrants its parts for a period of twelve (12) months from operation and
all claims for defective parts under this warranty must be made in writing immediately upon
discovery, and in any event, within eighteen (18) months from shipment of the applicable item,
whichever shall first occur. Upon Buyer’s submission of a claim as provided above and its
substantiation, Seller shall at its option either repair or replace its part at the original F.O.B. point of
delivery. Defective items must be held for Seller’s inspection and returned to the original F.O.B.
point upon request.
C. With respect to parts not manufactured or services not performed by Seller, Seller assigns to
Buyer whatever warranty Seller receives from the Supplier of such parts or services. However,
Seller agrees to be Buyer’s primary contact on all warranty claims.
D. The foregoing warranties are exclusive and in lieu of all other warranties, whether written, oral,
implied or statutory. NO IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR PURPOSE
SHALL APPLY.
E. Seller makes no performance warranty and the effects of corrosion, erosion and normal wear
and tear are specifically excluded from Seller’s warranty.
F. Seller will not be liable to Buyer for any loss or injury to persons or property (including the
machinery which is the object of the work) caused in whole or part by (1) the acts of buyer or its
agents, (2) failure to observe Seller’s instructions, or (3) failure or malfunctioning of anything not
furnished by Seller.
G. The preceding paragraphs set for the exclusive remedies for warranty claims, and upon the
expiration of the warranty period, all such liability shall terminate.
H.Normal Wearing parts are defined, but not limited to the following: Seals, Gaskets, O-rings, piston
rings and riders, bulbs, fuses, and anti-corrosion devices such as zincs. RIX Industries reserves the
right to evaluate these items for material workmanship and defects on a case by case basis.
I. FOB Destination Service Items are limited to the Continental United States (CONUS). Service
outside the CONUS is at the discretion of the seller, and or at buyer’s expense.



RIXIndustriesMAN‐2V3B‐4.1V‐P1Pageviii
COMPRESSORSPECIFICATIONS

This document is valid for the following RIX compressor models:
2V3B‐4.1V‐P1A
2V3B‐4.1V‐P1B
2V3B‐4.1V‐P1C
2V3B‐4.1V‐P1E

Warning
This equipment is designed only for the specific application noted on this page. It is
the user’s responsibility to ensure the compressor meets the below stated operating
conditions. Deviation from these standards may result in damage to the compressor
and/or operator injury or death.
GasInput
Design Gas: Clean Dry Oxygen
Pressure: 30 to 40 PSIG
Dew Point: – 40 °F Maximum
GasOutput
Flow: 10.6 SCFM* at 40 PSIG, 100 °F inlet
Pressure: 2500 PSIG Maximum
*Design basis of SCFM is 70°F and 14.7 psia

GeneralDesign
Design Speed: 540 RPM
Compressor Design: Three stage, oil-free compression, air-cooled
Cylinder Sizes: 2 1/4” & 1 3/8” & 5/8”
Stroke Length: 3”

ElectricalRequirements
Drive Motor: 10 HP
Control Circuit Voltage: 230 VAC
P1A Supply Power: 208-230VAC/3PH/60HZ
P1B Supply Power: 460VAC/3PH/60HZ
P1C Supply Power: 380-415VAC/3PH/50HZ
P1E Supply Power: 380-415VAC/3PH/60HZ
OperatingEnvironment
Installation: Indoors or Weather Protected
Ambient Temperature: 35 to 104 °F
Altitude: Sea Level to 4500’


RIXIndustriesMAN‐2V3B‐4.1V‐P1Page1
CHAPTER1:COMPRESSOROVERVIEW
This manual is intended to provide all necessary information and documentation pertinent to the
installation, operation, and maintenance of the RIX compressor family 2V3B-4.1V—models 2V3B-
4.1V-P1A, 2V3B-4.1V-P1B, 2V3B-4.1V-P1C, & 2V3B-4.1V-P1E. Ensure all operators of this
compressor package read and understand the entire manual prior to installation, operation, and/or
servicing. All servicing shall be performed only by trained and qualified personnel.

1.1DESCRIPTION
This is a 3 stage, 3 cylinder, air-cooled, oil-free compressor. The unit has been designed for the
compression of dry oxygento the pressures indicated on the registration page of this manual.
1.2GASCOMPRESSION
This compressor is designed to safely compress without cylinder oil lubrication. Teflon based
piston rings are used in all stages. The compression cylinders are isolated from the crankcase
lubricating oil by crosshead distance pieces and metal slingers on the piston rods.
1.3GASFLOW
Gas entering at the suction of the first stage is successively compressed through three stages to
provide the final discharge pressure. After each stage of compression the gas is cooled in a heat
exchanger by ambient air. A flow schematic shows the gas flow in more detail.
1.4COOLING
Due to the heat created by compression, it is necessary to cool the compressed gas after each stage
of compression. A cooling fan pulls air through the inter/aftercooler assembly and then routes the
air towards the compression cylinders.
1.5CRANKCASELUBRICATION
The entire crankcase assembly including guide cylinders is splash lubricated with automotive type
oil.


RIXIndustriesMAN‐2V3B‐4.1V‐P1Page2
CHAPTER2:INSTALLATION
2.1MOUNTING
The compressor must be firmly bolted down to a rigid foundation through all mounting holes to
minimize vibration. Any allowed movement will generally increase vibration which can lead to
component damage.
Due to the inherent danger of fire and/or explosion during O2 compression, flammable substances
should not be stored near the unit and the frequency of personnel coming in close contact with the
compressor during operation should be minimized. RIX recommends keeping a supply of high
purity N2 for start-up and testing of the compressor—see the O2 burn-in procedure in Section3.2.
2.2GASPLUMBING
Be sure all process lines are free from contamination. Plumbing to the compressor must be sized so
that pressure at the compressor suction is within the range given in CompressorSpecifications.
Discharge plumbing must be large enough to pass design flow at lowest expected back pressure
without choking the flow. User’s suction and discharge plumbing should be designed to
accommodate compressor vibration.
CAUTION
If flexible lines are used, user is responsible to secure those lines
to prevent whipping in case of breakage.
Safety relief valves are installed on the compressor at each stage of compression: suction,
interstage, and discharge. Do not start the compressor without these items properly installed. All
plumbing and components must be rated for pressures greater than the connected relief valve
setting.
Provisions must be in place to relieve all internal pressure and isolate the compressor from all
external pressure sources to ensure that the unit can be safely disassembled for maintenance. It
may be helpful to install a hand valve in the gas line downstream of the compressor to create back
pressure for testing and calibration.

DANGER 
Do not install ball valves in either suction or discharge plumbing. If
closed quickly, these valves can cause fire and/or explosion.
2.3CRANKCASELUBRICATION
Check the crankcase oil level via sight glass (oil level should be ¾ way up the sight glass) and
inspect for contamination from water or other foreign material. To add oil unscrew the plastic vent

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page3
on the crankcase cover plate. Change oil every 3000 hours, or annually, whichever comes first.
The unit has been shipped dry, so the User is responsible for adding oil prior to the first run.
Automotive type oil is recommended, either synthetic or carbon based. Synthetic is recommended
in cold temperatures. Multi-viscosity oil is acceptable. Synthetic compression oils are not suitable.
CRANKCASE OIL CAPACITY: 1 3/4 Quarts (1.66 liters)
VISCOSITY: Above 60˚F. - SAE 30W
Between32˚and 60˚F - SAE 20W
Between20˚and 32˚F - SAE 10W - synthetic oil preferred
Below20˚F - SAE 5W - synthetic oil required

2.4ELECTRICALCONNECTIONS
The unit must be wired to a source of power in accordance with applicable codes. The compressor
should be connected to power such that the cooling fan pulls air over the heat exchanger.
2.5STORAGE
If the compressor is taken out of service, provision should be made to protect against corrosion. At
a minimum, gas suction and discharge lines should be capped. The compressor should be rotated at
least once every 2 months. In corrosive environments, the distance pieces should be sealed and the
unit nitrogen purged.

After an extended storage (or if stored without climate control) the crankcase cover plate should be
removed and the roller bearings inspected for possible corrosion. Apply oil to all bearings before
replacing cover. Also, lift up oil packing boxes (inside distance pieces) and lubricate guide
cylinders.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page4
CHAPTER3:START‐UPANDOPERATINGPARAMETERS
3.1SYSTEMCHECKOUT
Check that crankcase oil level is ¾ up the sight glass and inspect for water or other foreign material.

Ensure that a free flow of gas is available to the compressor inlet and that the high pressure
discharge line is unobstructed. It is essential that an approved safety relief valve and pressure
gauge are installed between the compressor and the first item in the gas piping that can potentially
block the flow of gas. Do not start the compressor until these items are properly installed.
3.2 O2BURN‐INPROCEDURE
This procedure should be followed at initial start-up and anytime the compressor or associated
plumbing is disassembled and exposed to the atmosphere. All components must be oxygen clean
before proceeding.
1. Pressurize the system with clean, dry nitrogen or with a clean, dry nitrogen/oxygen mixture
not exceeding 30% oxygen.
2. Run compressor at conditions stated in CompressorSpecifications, using a closed loop if
necessary.
3. Slowly inject oxygen into the inlet while venting the compressor discharge until the unit is
running on pure oxygen. This step should take at least 30 minutes. This will allow any
organic materials left in the system to safely oxidize.
3.3START‐UP
Supply the required suction pressure to the compressor inlet. Check for leaks in the system and
correct as necessary.

Start the compressor and observe the pressure gauges. The final pressure will increase quickly to
the Back Pressure Regulator (BPR) setting. The inter-stage pressures should approach their normal
level as the final stage comes up to its final setting. See paragraph 3.4 for normal operating
pressures. Note: due to the floating high pressure piston the unit may experience light knocking for
1-2 seconds on start-up.
If inter-stage pressures do not reach normal levels check for leaks in the gas piping. A soapy water
solution is one way to do this (see paragraph 5.8). If inter-stage pressures exceed normal levels
(which may pop relief valves) this is due to valves on the next stage leaking back. Leaking valves
may be the result of inactivity in which case operating the unit at reduced back pressure (or at back
pressure valve setting) for 30 minutes may clear the problem. Also see troubleshooting guide.
If the compressor does not shut off when the discharge switch set pressure is reached, manually
shut down and check the switch and related wiring (see switch instructions near end of manual). If

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page5
necessary, adjust the switch. When working correctly, the compressor should automatically restart
when discharge pressure drops to the "on" pressure setting (automatic mode only).
Test the suction pressure switch by manually lowering the pressure to the compressor inlet. If the
compressor does not shut off when the switch set pressure is reached, manually shut down and
check the switch and related wiring. Operating the compressor with inadequate suction pressure
may overheat the final stage and/or cause banging of floating piston creating the potential for
severe damage. When working correctly the compressor should automatically restart when the
suction pressure rises back to the "on" pressure setting (automatic mode only).
Test temperature shutdown switch by manually lowering setting while operating at full pressure.
SEE CHAPTER 4 FOR CONTROL SYSTEM INFORMATION
Warning
A painful burn can be caused by touching any of the cylinder heads
or discharge gas lines from the heads to the inter/aftercooler.
Danger
Do not stick hand inside distance piece when unit is running. Metal
slingers on piston rods will crush fingers.
3.4NORMALOPERATINGPRESSURERANGES:

Suction: 30-40 psig
1st Stage:190-250 psig
2nd Stage:700-820 psig
3rd Stageup to 2500 psig
Back Pressure Regulator setting: 1500 psig (approximate)

It is recommended that a log be kept, noting operating pressures and maintenance done versus
hours of compressor operation. If pressures do not fall within the above ranges, or vary from your
historical pressures, check Chapter 6: Troubleshooting, for corrective action.
3.5RELIEFVALVESETTINGS

StageSymbolSetPoint
Suction RVI 50 Psig
1st Stage RV1 300 Psig
2nd Stage RV2 1000 Psig
3rd Stage RV3 2800 Psig


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CHAPTER4:CONTROLSYSTEMANDUNLOADEDSTARTUP

4.1SAFETYSWITCHSETTINGS

SwitchesSymbolFunctionSetPoint
Discharge Gas Pressure SPD Stop 2500 psig max
Start approx 500 psi less
Suction Gas Pressure SPI Stop 30 psig falling
Start 40 psig rising
High Gas Temperature Shutdown 400 OF Max*
*Tempswitchtobeset30˚Fabovemaximumobservedoperatingtemperatureor400OF,
whicheverislower.

4.2CONTROLSYSTEM
The control system is designed for two modes of operation:
1) Manual start / automatic stop
2) Auto start / stop based on both suction and discharge pressure 
An HOA (HAND/OFF/AUTO) switch is provided on the control panel which allows choice of modes.
The suction and discharge pressure switches have a "cut in" setting for starting and a "cut out" setting
for stopping. The deadband the inlet switch is adjustable. See instructions in appendix for
adjustments.
In the event of an emergency an E-Stop button is provided. The E-Stop will disconnect all power to
the control box. The E-Stop has a mechanical Push-Pull latch. Pushing the button will stop all
operation. To continue operation pull the E-Stop button to reengage circuit control.
Warning
If the unit is in AUTO mode when the E-Stop button is pulled the unit will automatically restart. Place
the HOA Switch in OFF mode before pulling the E-Stop button.
Details of the two operating modes are as follows:
ManualModeofOperation
With the selector switch in the HAND position the compressor is in manual mode and will start when
the START pushbutton is pressed. The unit will continue to run until one of the safety switches stops
the unit. At that point the compressor will not restart until the START pushbutton is pressed again.
If any switch remains above the "cut in" setting the compressor will not start. To manually stop the
unit, switch the HOA switch to the OFF position.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page7
AutomaticModeofOperation

With the selector switch in the AUTO position the compressor will automatically start and stop
based on the signal from either the suction or discharge pressure switch. When shutdown by either
switch, the compressor will remain on standby until the pressure reverts back to the "cut in" point
of the switch, at which point the compressor will restart. If shutdown by high gas temperature, the
unit will remain off until the it cools down below the temperature switch set point and the fault is
cleared by pressing and releasing the emergency stop button. To manually stop the unit, switch the
HOA switch to the OFF position.

ElectricalSchematicDescription
The following explains the logic sequence as reflected on the schematic:
a. With power applied to the unit and the selector switch (SA) in HAND, push
the START pushbutton.
b. The two pressure switches, low inlet (SPI) and discharge (SPD) are connected
in series to the motor controller. If the inlet pressure is high enough to close
the inlet switch, and the discharge switch remains closed (pressure below the
switch "cut in" setting) the compressor will start.
c. Current passes through the two closed pressure switches, the closed relay
(KA-2) and energizes the starter coil (KM). The starter coil starts the main
drive motor (M). The fan motor (FM) and hour meter (HM) also operate at
this point. The green light (HL1) will energize indicating the compressor is
running. Tripping of either the inlet or discharge switch will break current to
the coil which will stop the drive motor.
d. If the 3rd stage temperature reaches the switch set point the temperature
switch (TIS) opens and de-energizes relay KA. When relay KA is de-energized,
contact KA-2 opens and removes power to the motor starter coil (C). This
stops the compressor motor, fan motor, and the hour meter. The green light
will de-energize. Contact K1-1 closes and the red light (HL2) energizes
signaling a high temperature condition. After the temperature switch has
reset, the emergency stop button must be pushed to clear the fault, followed
by the start button to restart the compressor in manual mode. In auto mode
the compressor will restart after the emergency stop is pressed and released.
e. The compressor may also be run in the automatic mode by selecting AUTO on
the HOA (SA) switch. All features are the same as described above except that
after the inlet or discharge switch shut down the unit, the compressor will
automatically restart when the switches are moved to the "cut in" setting. The
compressor will continue cycling until the selector switch is moved to either
HAND or OFF.
f. The unit may be stopped at any time by switching the HOA to OFF.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page8
CHAPTER5:ROUTINEINSPECTIONANDSCHEDULEDMAINTENANCE

The purpose of this chapter is to provide the operator with the routine inspection and scheduled
maintenance information required to insure a long service life of the subject compressor. Detailed
procedures for maintenance are contained in chapter 7.
5.1ROUTINEINSPECTION
a. Check that crankcase oil level is 3/4 of the way up on sight glass. Check for oil leaks.
b. Check gauge pressures against normal operating cylinder pressures.
c. Check cooling air flow. Verify heat exchanger fins are clean and free from blockages.
d. Check for unusual noises or vibrations.

Danger
To prevent FIRE,SERIOUSINJURYorDEATH, it is the User’s responsibility to
ensure that all parts used in the oxygen contacting areas of the compressor are
cleaned for oxygen service prior to installation.
All gas piping and storage systems connected to the compressor must be oxygen
clean and constructed of oxygen compatible materials.
No attempt should be made to work on the machine without full knowledge of
oxygen equipment handling procedures and the potential hazards of
contamination.
Cleaning should be in accordance with Compressed Gas Associationpublication
CGAG‐4.1, Cleaning Equipment for Oxygen Service.www.cganet.com
Any work to be done on the compressor where the gas stream may be exposed
must be done in accordance with CGA procedures.
RIX factory oxygen cleaned parts are denoted by an “X” prefix at the
beginning of the part number. It is the User’s responsibility to maintain
the cleanliness of factory cleaned parts, and any areas of the compressor
gas stream that may be exposed to contamination during maintenance.
Assembly drawings included in this manual may not have part numbers "X"
marked and therefore should be used for assembly reference only. Refer to the
parts lists in the RIX manual when ordering all parts.
Use only oxygen compatible O-ring grease and either Viton or Teflon O-rings in
gas piping areas.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page9
5.2 SCHEDULEDMAINTENANCE

Para.OperationTimeintervalsinhours
5.3 Filter Cleaning............................................................................. 3000 or as required
5.4 Crankcase Lubricating Oil ................................................... 3000 or once per year
5.5 Drive-belt Adjustment ........................................................................Annually
5.6 Electric Motor Lubrication ............................................................as required
5.7 Pressure Relief Valves ........................................................................Annually
5.8 Gas Piping Leak Check ..................................................... 1000 or after maintenance
5.9 Compressor Valves ................................................................... 4500 or as required
5.10 Piston Rings – 3rd stage ......................................................... 1500 or as required
Piston Rings – 2nd stage......................................................... 3000 or as required
Piston Rings – 1st stage .......................................................... 4500 or as required
5.11 Cylinder Liners ....................................................................................as required
5.12 Piston rod oil seals............................................................................. as required
Warning

Before performing any of the scheduled maintenance tasks in this
chapter, the compressor should be de-energized and tagged“Outof
Service”. This is to prevent an inadvertent start which could cause
injury to personnel or damage to the equipment. Allow piping to cool
before repair.
5.3FILTER
Every 3000 hours (or as required) the discharge filter should be cleaned or replaced. 

5.4CRANKCASELUBRICATINGOIL
Every 3000 hours of running time (or annually) the crankcase oil should be renewed. Failing to
change the oil as scheduled may result in premature or accelerated wear to the running gear
(crankshaft, main / connecting rod bearings and the crosshead).
5.5MOTORLUBRICATION

If motor does not have grease fittings, the bearings are sealed for life. Otherwise, follow the
manufacturer’s recommendation.
5.6DRIVEBELTS

Properly tensioned belts insure a longer life. Correct belt tension for the 2V unit allows one quarter
inch deflection with 8-10 lb. force applied per belt at mid-span. New belts may require tightening
after 24-48 hours of operation. Two belts are required. Units with the flywheel grooves painted
normally require banded belts as single belts may rotate in the grooves. See Chapter 7.2 for more
information.

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page10
5.7PRESSURERELIEFVALVES

The pressure relief valves should be removed from the compressor, inspected for cleanliness, and
tested for correct set-point every 8000 hours or once per year. If a valve fails to lift at its rated
pressure, it must be readjusted, and if necessary, rebuilt or replaced.
5.8GASPIPINGLEAKCHECK

Every 1000 hours all piping joints should be examined for leaks. Leak testing requires that the
compressor be pressurized, and therefore running or recently run. Also check joints after reassembly
from maintenance.
A soapy solution in a squirt bottle works best for locating leaks in a gas system. Any gaskets and O-
rings needed for the repair should be on hand prior to attempting to fix a leak. This test is simplified
if the compressor is allowed to cool, then restarted immediately prior to running the leak test, since
the hot discharge pipes can boil away the soap solution making detection of leaks difficult or
impossible.
Caution
Do not use any flammable solution for leak testing.
Warning

Hot discharge lines can produce painful burns - be careful to avoid
making contact with hot pipes. Wear safety glasses at all times.
PROCEDURE:
a. Restart compressor after it has been allowed to cool down.
b. Systematically move from joint to joint and fitting to fitting in the gas system piping,
spraying the leak test solution.
c. Observe for the formation of bubbles. Mark location of any detected leaks. Large leaks
may blow the soap solution away as quickly as it is applied. These may be detected by
feel, again being careful of hot discharge lines.
d. O-ring joints cannot be corrected by additional tightening. In most cases, a new o-ring
must be installed. Always inspect the surfaces that seal against the o-ring for defects
and correct as required. Insure the proper durometer (hardness) o-ring is used.
Note: See Drawing A5089 for O-ring installation and material information
5.9VALVES
Valves should be inspected every 4000 hours of operation, or earlier if pressures vary from normal,
flow capacity drops, noise is detected or an abnormally high temperature is observed. The customer

RIXIndustriesMAN‐2V3B‐4.1V‐P1Page11
should establish reference data for use in scheduled maintenance by taking gauge readings when the
compressor is running under normal operating conditions.
The perimeter of valve seats and o-rings may be lightly lubed with appropriate grease to ease
assembly. Alignment pins may also be lubed to help hold in place. (see additional information in
chapter 7)
5.10PISTONRINGS
As the piston rings wear, their ability to seal is diminished. Excessive wear will result in lower
compressor capacity, more frequent compressor operation and unnecessary wear on other
components. There is also risk of damaging cylinder liner walls if the rings wear out completely.
Excess piston to cylinder clearance, caused from either piston or cylinder liner wear, will significantly
decrease ring life. Cylinder bores should be observed for wear at ring change-outs and measured for
wear if ring life has significantly decreased. For maximum ring life, pistons should not be removed
from cylinders prior to ring replacement.
For the 3rd stage floating piston it is recommended that the piston be replaced with the rings as an
assembly at the first change-out, and thereafter as necessary. If undamaged, the original piston can
be re-ringed by the user and kept for the next change-out.
A common indicator of worn rings is low compressor flow. On this 2V3 unit, the 3rd stage is located
over the 2nd stage, and all 3rd stage piston ring blowby passes into the 2nd stage compression area.
As the 3rd stage rings wear, the 2nd stage pressure will tend to increase. Too much ring blowby will
cause the 2nd stage relief valve to pop, at which point the 3rd stage rings must be replaced. If the
2nd stage rings are also worn excessively, their leak rate may prevent the 2nd stage pressure from
increasing. Gas leaking past either the 1st or 2nd stage rings passes thru the distance piece to
atmosphere.
As the 1st or 2nd stages rings wear the cylinder pressures will tend to be lowered. With extreme
wear the compressor will not be able to compress to the design final stage discharge pressure.
Ring life will vary with discharge pressure, atmospheric temperature and frequency of start/stop
cycles. A low ambient temperature will increase ring life. Frequent start/stop cycles will reduce ring
life. If possible, allow downstream pressure to drop as low as possible before restarting compressor.
5.11CYLINDERLINERS

When ring life deteriorates from normal, liners should be checked for surface finish, scoring or
excessive wear. Maximum wear will normally occur 1/3 to 1/2 way down the bore. A bore gauge is
the best way to measure wear. Check diameter at several depths for wash-boarding, and hone or
replace as required. See chapter 7 for maximum diameters. Cleaning may not be required on normal
ring change-outs unless contaminates are present.
The desired cylinder surface is a 16-32 crosshatch. Surface roughness is needed to allow engraining
of Teflon in the bore. A smoother bore will reduce ring life. Re-hone cylinder as required, removing
a minimum of material.