Hi Flow Stroller

Technical Service ManualI Preface
Hi Flow Stroller

United States		Phone:
800 482 2473

Fax :888 932 2473

Asia, Australia, Pacific Rim
Phone:+61 297 494333

Fax:

888 932 2473

EuropePhone:

Fax:+44(0) 1189 799245+44(0) 1189 367060

Abbreviations
FCV Flow Control Valve
LED Light Emitting Diode
LOX Liquid Oxygen
LPM Liters Per Minute
NER Normal Evaporation Rate
POI Patient Operating Instructions
N2 Nitrogen Gas
TF Top Fill
DF Dual Fill

PRV
QDV
RMA
RP
R/R
SRV
O2
SF
PTFE

Primary Relief Valve
Quick Disconnect Valve
Return Materials Authorization
Repair Procedure
Removal and Replacement
Secondary Relief Valve
Oxygen Gas
Side Fill
Polytetrafluoroethylene (Teflon®)

Definition of Terms
WARNING Description of a condition that can result in personal injury or death.
CAUTION Description of a condition that can result in equipment or component damage.
NOTE
A statement containing information important enough to emphasize or repeat.
(ITEM)
Item numbers used throughout this manual are shown on the illustrations beginning on page 34.
Disclaimer
This manual is intended for use by experienced personnel only. No attempt should be made to fill or maintain this equipment until both this manual and the Patient Operating Instruction booklet have been read and fully understood.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

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II Table of Contents
II. Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
III. Equipment Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Hi Flow Stroller

I. Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

IV. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
V. Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
VI. Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10VII. Unpacking and Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
VIII. Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
IX. Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
X. Troubleshooting/Repair Procedures (Table of Contents) . . . . . . . 15
Troubleshooting Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Service Tools/Equipment/Supplies. . . . . . . . . . . . . . . . . . . . . . 33
XI. Parts Price List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
XII. Restocking Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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III Equipment Description
CAIRE, Inc.’s Hi Flow Stroller is the portable component of the
Liberator/Portable supplementary oxygen system. Enclosed ina durable simulated leather case, Hi Flow Strollers incoporate astainless steel cryogenic container with the valves, plumbing, andassociated hardware required to deliver gaseous oxygen to the patient at near ambient temperature.
The Hi Flow Stroller is comprised of five major assemblies,
grouped according to function.

Hi Flow Stroller

FIGURE 1: Hi Flow Stroller Components

1. Cryogenic Container – This assembly is a double walled,
vacuum insulated dewar for storing liquid oxygen at approximately -180°C (-300° F).
2. Breathing Circuit – This circuit consists of the manifold assembly, fixed orifice rotary flow control valve (FCV) andvaporizing coil. It withdraws liquid oxygen from the cryogenic container, warms it to near ambient temperature, andregulates the flow of oxygen gas to the patient. Water thatcondenses on the cold coils is collected and absorbed by thecondensate pad.
3. Case Assembly – The case houses and protects the cryogenic
container, the breathing circuit, and the liquid level meter.
4. Liquid Level Meter – This system uses a capacitance probe
and an electronic (LED) readout to measure and display the
LOX level by pressing the onboard operate button.
5. Filling Circuit – This manual covers both the side fill Hi Flowwith the rotary quick disconnect valve and the top fill Hi Flowwith the push quick disconnect valve for filling.

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IV Specifications (Nominal Values)
Capacity
LOX lbs. (kg)Liquid Liters
Gaseous Liters
Hi Flow Selectable Flow Rates

Flow Rate Accuracy

3.0 (1,36)
1,25
1026
Off 0,5 1,02,0 2,5 3,04,0 6,0 8,010,0 12,0 15,0
± 0.1 liter per minuteor ±10% of flow setting,whichever is greater		Normal Evaporation Rate lbs./day (kg/day)

1.2 (0,54)

Operating Pressure PSIG (Bar)20 (1,4)

Primary Relief Valve Setting PSIG (Bar)Hi Flow Stroller

HI FLOW STROLLER				

19.7 - 21.5 (1,35 - 1,48)

Secondary Relief Valve Setting PSIG (Bar)
Filling Time
Warm minutes:seconds
Cold minutes:seconds

2:00
1:00

Height in (cm)13.5 (34,3)

Width in (cm)7.25 (18.4)

WeightEmpty lbs. (kg)Full lbs. (kg)5.1 (2,3)
8 (3,6)

Fill Connector Types

Male side mounted rotary coupling, female bottom mounted push-on coupling,or female bottom mounted rotary coupling.

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V Safety

These hazards require certain safety precautions to be taken whenworking with or around gaseous and/or liquid oxygen:
1. Never permit combustible substances such as greases, oils,
solvents, or other compounds not oxygen compatible tocontact any component of the unit exposed to higher-thanatmospheric concentrations of gaseous or liquid oxygen. This
especially applies to tubing, fittings, and valves.
2. Keep oxygen equipment away from open flames or electricalappliances such as heaters, stoves, toasters, and other devices
with heating elements.
3. Never permit smoking in an area where oxygen equipment isrepaired, filled, or used.
4. Always wear goggles, a face shield, and insulated gloves whenworking with or around liquid oxygen.
While CAIRE, Inc. equipment is designed and built to the mostrigid standards, no piece of mechanical equipment can ever bemade 100% foolproof. Strict compliance with proper safety practices is necessary when using any Hi Flow unit. We recommendthat our distributors emphasize safety and safe handling practices
to their employees and customers. While safety features have been
designed into the unit and safe operations are anticipated, it is necessary that all distributor personnel carefully read and fully understand WARNINGS, CAUTIONS, and NOTES throughout the
manual. Periodic review of this information is recommended.

WARNING: Excess accumulation of oxygen creates an oxygenenriched atmosphere (defined by the Compressed Gas Association
as an oxygen concentration above 23%). In an oxygen-enrichedatmosphere, flammable items may burn vigorously and may explode. Certain items considered non-combustible in air may burnrapidly in such an environment. Keep all organic materials andother flammable substances away from possible contact with oxygen; particularly oil, grease, kerosene, cloth, wood, paint, tar, coaldust, and dirt which may contain oil or grease. DO NOT permit
smoking or open flame in any area where oxygen is stored, handled, or used. Failure to comply with this warning may result inserious personal injury.

Hi Flow Stroller

Oxygen, as it exists at standard atmospheric pressure and temperature, is a colorless, odorless, and tasteless gas. Oxygen constitutes
21% of the atmosphere, by volume. Aside from its well-documented ability to sustain life, oxygen also supports combustion,even though it is nonflammable. Many substances which will burnin air, burn at a faster rate and at a higher temperature in an oxygen enriched atmosphere. Other materials that do not burn in air
will burn as oxygen concentration increases. Additionally, many
greases and liquid solvents become extremely hazardous materials when placed in an oxygen-enriched environment. In its liquid
form, oxygen is still odorless and tasteless, but is pale blue in color.
At an operating pressure of 20 psig (1,4 bar), the temperature ofliquid oxygen is about -173°C (-280° F). Skin exposed to such a lowtemperature can become severely frostbitten.

WARNING: In the event a unit is dropped, tipped over, or unreasonably abused; immediately, but cautiously, raise the container
to its normal vertical position. If substantial container damage
has occurred, remove the liquid oxygen from the vessel in a safemanner (RP14). Purge the unit with an inert gas (nitrogen) andpromptly return it to CAIRE, Inc. for inspection. The container
should be prominently marked “CONTAINER DROPPED,INSPECT FOR DAMAGE.” Failure to comply with these procedures may result in personal injury and can seriously damage thecontainer.
WARNING: Personnel must remove liquid oxygen and depressurize the unit before removing parts or loosening fittings froma unit. Failure to do so may result in personal injury from theextreme cold of liquid oxygen and/or the pressure in the vessel.
WARNING: During transfer of liquid oxygen, components will
become extremely cold. Care should be used to avoid any contact
with these components, as serious frostbite may result.
WARNING: Keep filled unit upright at all times. Tip over of filledunit may result in liquid oxygen leakage and/or an oxygen-enriched atmosphere.
CAUTION: Only use replacement equipment which is compatible
with liquid oxygen and has been cleaned for oxygen use. Do not use
regulators, fittings, hoses, etc. which have been previously used in
non-oxygen service.

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V
1 Safety
WARNING: The use of Accessories, transducers, and cables otherthan those specified by the manufacturer may result in increased
Emissions or decreased immunity of the Hi Flow.

WARNING: Portable and mobile RF communications equipment
can affect Medical Electrical Equipment.

WARNING: The Hi Flow should not be used adjacent to or stacked
with other equipment, and that if adjacent or stacked use is necessary, the Hi Flow should be observed to verify normal operation in
the configuration in which it will be used.

Hi Flow Stroller

WARNING: Medical electrical Equipment needs special precautions regarding EMC and needs to be installed and put into service
according to the EMC information provided in this manual.

Table 1
Guidance and Manufacturer’s declaration—electromagnetic emissions
The Hi Flow is intended for use in the electromagnetic environment specified below. The customer or the user of the Hi Flow should
assure that it is used in such an environment.
Emissions test

Compliance

RF emissions

Group 1CISPR 11		

Electromagnetic environment—guidance
The Hi Flow uses RF energy only for internal function.
Therefore, its RF emissions are very low and are not likely tocause any interference in nearby electronic equipment.

RF emissions CISPR 11

Class B

Harmonic emissions
IEC 61000-3-2

The Hi Flow is suitable for use in all establishments,
Not applicable

Voltage fluctuations/		
flicker emissions

including domestic establishments and those directly connected tothe public low-voltage power supply network that supplies 		

Not applicablebuildings used fordomestic purposes.

IEC 61000-3-3

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V
1 Safety
Guidance and manufacturers declaration—electromagnetic immunity
The Hi Flow is intended for use in the electromagnetic environment specified below. The customer or the user of the Hi Flow should
assure that it is used in such an environment.
Immunity test

IEC 60601 test level

Compliance level

Electrostatic±6 kV contact±6 kV contact±8 kV air

±8 kV airdischarge (ESD)
IEC 61000-4-2			

Electromagnetic environment—guidance

Hi Flow Stroller

Table 2

Floors should be wood, concrete or ceramic tile. If floors
are covered with synthetic material, the relative
humidity should be at least 30%.*

Electrical fast

±2 kV for powerNot applicabletransient/burst

supply lines

DC powered device

IEC 610004-4±1 kV forNot applicable		Not applicable

input/output lines No data input/output lines±1 kV line(s)SurgeIEC 61000-4-5

to line(s)Not Applicable±2 kV line(s)DC powered device

Not Applicableto earth
Voltage dips,<5% UT (>95% dip		short interruptionsin UT) for 0,5 cycle		and voltage

40% UT (60% dip		variations on

in UT) for 5 cycles

Not Applicable

power supply

70% UT (30% dip

DC powered device

input lines

in UT) for 25 cycles		IEC 61000-4-11<5% UT (>95% dip

Not Applicablein UT) for 5 sec
Power frequency

3 A/m

3 A/m

Power frequency magnetic fields should be at levels(50/60 Hz)

characteristic of a typical location in a typicalmagnetic fieldcommercial or hospital environment.

IEC 61000-4-8
Note: UT is the a.c. mains voltage prior to application of the test level.

* This statement indicates that the required testing was performed in a controlled environment and the Hi Flows are found to be compliant with regulations.

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V
1 Safety
Guidance and manufacturers declaration—electromagnetic immunity
The Hi Flow is intended for use in the electromagnetic environment specified below. The customer or the user of the Hi Flow should
assure that it is used in such an environment.
Immunity test
Conducted RF
IEC 61000-4-6

Radiated RF
IEC 61000-4-3

IEC 60601 test level
3Vrms
150kHz to 80 MHz

3 V/m
80 MHz to 2,5 GHz		

Compliance level
Not Applicable
Battery powered
device3 V/mElectromagnetic environment—guidancePortable and mobile RF communications equipment should
be used no closer to any part of the Hi Flow,
including cables, than the recommended separation
distance calculated from the equation applicable to thefrequency of the transmitter.
Recommended separation distanced = 1.2 √P
d = 1.2 √P 80 MHz to 800 MHz
d = 2.3 √P 800 MHz to 2,5 GHz

Hi Flow Stroller

Table 4*

where P is the maximum output power rating of thetransmitter in watts (W) according to the transmitter
manufacturer and d is the recommended separation
distance in meters (m).
Field strengths from fixed RF transmitters, as determinedby an electromagnetic site surverya, should be less thanthe compliance level in each frequency rangeb.
Interference may occur in the vicinity of equipment marked
with the following symbol:

NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection fromstructures, objects and people.
aField strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur
radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To asses the electromagnetic
environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the Hi Flow is used exceeds the applicable RF compliance level above, the Hi Flow should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the Hi Flow.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

* This table is included as a standard requirement for equipment which has been tested to specific test levels and over specific frquency
ranges and been found compliant with regulations.

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V
1 Safety
Recommended separation distances between portable and mobile
RF communications equipment and the Hi Flow
The Hi Flow is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer
or the user of the Hi Flow can help prevent electromagnetic interference by maintaining a minimum distance between portable andmobile RF communications equipment (transmitters) and the Hi Flow­as recommended below, according to the maximum output
power of the communications equipment.

Hi Flow Stroller

Table 6*

Rated maximum output		Separation distance according to frequency of transmitter
power of transmitterm
150 kHz to 80 MHz

80 MHz and 800 MHz

800 MHz to 2,5 GHz

d=1.2√P

d=1.2 √P

d=2.3 √P

0,01

0.12 m0.12 m

0.23 m0,10.38 m0.38 m0.73 m

1

1.2 m

1.2 m

2.3 m

10

3.8 m

3.8 m

7.3 m

W

100
12 m
12 m
23 m
For transmitters rated at a maximum output power not listed above, the recommended separation distance (d) in meters (m) can be
estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.
NOTE 1 at 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection fromstructures, objects and people.
* This table is included as a standard requirement for equipment which has been tested to specific test levels and over specific frquency
ranges and been found compliant with regulations.

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VI Theory of Operation
Oxygen Withdrawl

1. Method

With oxygen in the unit, and the vent valve closed, the pressurein the inner vessel will remain at or near the primary relief valvepressure of 19.7 - 20.6 (1,35 - 1,42).

The Hi Flow Stroller is a portable unit designed to be filled by thepatient from a Liberator, Low Loss Reservoir, or other compatibleunit.
The unit is filled by coupling the quick disconnect valve of the
Hi Flow Stroller with the quick disconnect valve on the Reservoir
and opening the vent valve on the portable. Liquid oxygen isforced up the Reservoir fill tube, through the coupled quick connectors, and into the inner vessel of the Hi Flow Stroller.
There will be some oxygen vaporized during filling. This gas isdischarged through the vent valve. When the unit is full, liquid
oxygen is expelled through the vent valve. Closing the vent valve
and separating the units terminates the fill process.
2. Saturation Pressure

At operating pressure and with the flow control valve at any setting other than Off, pressure forces liquid oxygen up the liquid
withdrawl tube and into the breathing coil. In the breathing coil,liquid oxygen absorbs heat and vaporizes, warming to almost ambient temperature by the time gas is dispensed by the flow control
valve to the patient.

Hi Flow Stroller

Filling

FIGURE 3: Oxygen Withdrawl

PRV

The liquid oxygen saturation pressure can seriously affect theoverall efficiency and operation of the Hi Flow Stroller.

FCV
Gas to Patienta. If the saturation pressure of the liquid in the fill source isgreater than 30 psig (2,1 bar), high filling losses and/or frozen open relief devices may result.

SRVb. If the saturation pressure of the liquid in the fill source is below 18 psig (1,2 bar), below tolerance flow rates may result.
FIGURE 2: Filling

PRV

Gas
Vent Valve

FCV

Gas
SRV
LiquidFill Connection(QDV)Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

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VI Theory of Operation
1. LEDHi Flow Strollers are equipped with a unique liquid level measurement system. This system measures the level of liquid oxygen
inside the unit with a capacitance probe and displays that liquid
level on the level meter’s LEDs.
The liquid level probe consists of two concentric stainless steel
cylinders extending inside the inner vessel. As the liquid oxygen
level rises, the capacitance of this assembly goes up. The level
meter then displays the liquid level in the cylinder based on acalibration relating capacitance to level. The higher the liquid
level in the dewar, the more LEDs are activated, beginning at theleftmost LED.
Electrical connection between the G4 meter and the probe ismade via a single conductor JST connector. The male plug isattached to its female counterpart extending from the probe,
creating a watertight connection. A single ground wire is connected from the meter to a male spade terminal on the mounting bracket.

The meter is powered by an internal battery, offering an estimated battery life of 5 years or more at 30 actuations per day.
The meter has a low battery (LOW BATT) indicator which
signals the need for battery replacement. The meter battery iscovered under a 2-year limited warranty. If battery failure occurs within 2 years of the Hi Flow Stroller shipment date, contact CAIRE, Inc. customer service for a replacement meter. If themeter battery is no longer under warranty, the CR2032 coin cellbattery can be replaced (RP2). The battery can be found at mosthardware stores, or they can be ordered through CAIRE, Inc.
customer service.

Hi Flow Stroller

Liquid Level Measurement

The new level meter improves upon the previous meter by integrating all components within its casing, simplifying removal
and replacement (RP8). Even more importantly from a technicalservice point of view, there is a much improved calibration procedure requiring no additional tools and a range of error reporting codes which can be read directly from the LEDs to reportcalibration errors. These calibration codes can be found in thecalibration procedure (RP5).

FIGURE 4: Liquid Level Meter
Meter Package

Plug Connector

Male Quick
Connect Valve

Probe Outer
CylinderLiquid Fill Tube
(Probe Inner Cylinder)

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VII Unpacking and Setup
FIGURE 5: Flow Control Knob

1. Inspect the carton for shipping damage. Report any damage tothe freight company before signing the bill of lading.
2. Check the description on the carton against your order.
3. Unpack the unit, including the Patient Operating Instructions(POI).

Hi Flow Stroller

Unpacking4. Set aside the packing material in case the unit must be returned to the factory.
Setup
If desired, the flow control knob (Item 20) can be adjusted so it will
not exceed the maximum prescribed flow rate.
1. To remove the flow control knob, firmly grip and pull straight
up away from the portable.
2. Remove the flow rate decal number disc (Item 21).
3. Remove the 2 Phillips head screws (Item 22) from the flow
lock plate (Item 26) and remove the plate.
4. Remove the locking pin (Item 23) from its storage position on
the flow lock plate and place in the underside of the hole corresponding to the maximum allowable flow rate.
5. Replace the flow lock plate (Item 26) and tighten screws (Item22). Replace number disk (Item 21) and push-on knob (Item20). Verify the flow lock is at the correct position.

VIII Operation
Refer to Patient Operating Instrucions (POI) Manual.

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IX Maintenance (Schedule A, 30 Month)

CAIRE, Inc. recommends returning the unit to a CAIRE service
facility every 10 years for vacuum check and re-evacuation if
necessary.
Schedule A – 30 Month
A. Introduction
Routine maintenance is a series of steps used to assure that equipment is functioning properly.
1. If a unit fails a given test, one of two things may be done:
a. Refer to Troubleshooting section (Pages 17-21) of thismanual.
b. Return the unit to CAIRE, Inc. for repair.
2. Schedule A – Maximum of 30 Months between routine
maintenance testing. Unit should be tested whenever a problem issuspected.
B. Procedure
Follow the steps in order listed. If the unit fails any step,refer to the Troubleshooting section (Pages 17-21) of this manual.
1. Visual Inspection:
a. Look for damaged or missing parts.
b. Dry condensation pad. Replace if soiled.

TABLE 1: Flow Test Acceptable Ranges
Unit TypeStandard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard

FCV Setting
OFF
0,50
1,00
2,00
2,50
3,00
4,00
6,00
8,00
10,00
12,00
15,00

LPM
0
0.33 to 0.67
0.83 to 1.17
1.61 to 2.43
2.08 to 2.97
2.55 to 3.51
3.43 to 4.62
5.14 to 6.92
6.72 to 9.28
8.42 to 11.53
10.24 to 13.83
12.97 to 17.28

Hi Flow Stroller

There are two schedules for routine maintenance which the homehealth care distributor may follow. These schedules allow thedis-tributor maximum flexibility while assuring that theequipment is operating properly.

b. Check all flow settings to chart above and check pressure to
be at least 18 psig (1,2 bar).
5. Prepare for Use:a. Empty contents by setting FCV at the highest flow setting
and running unit until dry and warm to room temperature(approximately one hour).
b. Verify that meter reads empty (1 LED) and that the low battery LED is not lit.
c. Clean case with household glass cleaner and lint free cloth(do not get in any valves).

2. Full Unit:
a. Fill, vent full, of LOX.
b. Check for audible or visual leaks in QDV and vent valve.
c. Verify that the meter reads full (8 LED).
3. Check Efficiency of Unit:
a. Allow the unit to stabilize after filling (10–15 minutes).
b. Inspect the bottle for cold sweaty condition, and for excessive venting from relief valve (some venting is normal).
c. If either condition is observed, conduct NER test (see RP28
in this manual).
4. Flow Test (Table 1):
a. Set FCV to the highest flow setting, run for at least 20 minutes.

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IX Maintenance (Schedule B, Continuous)
A. Introduction
Continuous maintenance is a set of tests and inspections performed periodically to ensure the equipment is functioning properly. It can be done with equipment in service by drivers or otherpersonnel.
1. If a unit fails a given test, it should be taken out of service.
Refer to the Troubleshooting section (Pages 17-21) or contact Technical Service.
2. Schedule B – Checks are made when the driver visits patients
and when equipment is transferred between patients.

4. Flow Test (Table 1):
a. Set flow control knob to highest flow setting, run for atleast 20 minutes.
b. Check all flow settings with chart below and check pressure to at least 18 psig (1,2 bar).
5. Prepare for Use:

Hi Flow Stroller

Schedule B – Continuousa. Empty contents by turning flow selection knob to highest
flow setting and running unit until dry and warm to room
temperature (approximately one hour).
b. Verify that the meter reads empty.
c. Clean case per RP27.

B. Procedure
These inspections are to be performed at least once per year by
the driver or other personnel when the Hi Flow is in use by thepatient (LOX in the unit).
1. Visual Inspection:a. Case not damaged or dirty. Flow control knob turns easily
with firm detent feel.
b. Condensation pad is not soaking wet or excessively dirty.
c. QDV pin not bent (side fill only).
2. Verify that the meter reads the correct liquid level.
3. Check flow rate, Erie liter meter (± 0.25 LPM) can be used.
These inspections/tests are to be done between patients.
1. Visual Inspection:a. Damaged case.
b. Condensation pad (replace if soiled).
c. QDV pin not bent (side fill only).
d. Inspect interior of unit for dirt or contaminants.
2. Verify that liquid level meter reads empty.
3. Fill Unit:
a. Verify that liquid level gauge reads full.
b. Check for audible/visual leaks in QDV and vent valves.

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X Maintenance (Schedule B, Continuous)
Introduction----------------------------------------------------------------------------- 16
Troubleshooting Charts------------------------------------------------------------------------ 17-21
Repair Procedures
		RP1
General----------------------------------------------------------------------------- 22
RP2
Battery RR ------------------------------------------------------------------------- 22
RP3
Condensate Pad RR--------------------------------------------------------------- 23
RP4
Soft Case RR----------------------------------------------------------------------- 23
RP5
G4 Empty Capacitance Meter Calibration--------------------------------------- 24
RP6
G4 Meter Span Setting Adjustment---------------------------------------------- 25
RP7
Manifold Capacitance Test------------------------------------------------------- 25
RP8
G4 Meter RR----------------------------------------------------------------------- 26
RP9
Manifold Assembly RR------------------------------------------------------------ 26
RP10
Resolder Feed-Thru Wire--------------------------------------------------------- 26
RP11
Clean/Dry Probe Dewar---------------------------------------------------------- 27
RP12
LOX Fill---------------------------------------------------------------------------- 27
RP13
Liberator Lip Seal RR (Side Fill)-------------------------------------------------- 27
RP14
Empty and Warm----------------------------------------------------------------- 27
RP15
QDV RR (Side Fill)---------------------------------------------------------------- 27
RP16
QDV RR (Top Fill)---------------------------------------------------------------- 27
RP17
Pressure Retention Test ---------------------------------------------------------- 28
RP18
Plumbing Leak Test--------------------------------------------------------------- 28
RP19
Vent Valve RR -------------------------------------------------------------------- 29
RP20
FCV RR---------------------------------------------------------------------------- 29
RP21
SRV RR----------------------------------------------------------------------------- 29
RP22
PRV RR ---------------------------------------------------------------------------- 29
RP23A Breathing Coil RR (Side Fill)----------------------------------------------------- 30
RP23B Breathing Coil RR (Top Fill)------------------------------------------------------ 30
RP24
Flow Rate Testing----------------------------------------------------------------- 31
RP25
Operating Pressure Test----------------------------------------------------------- 31
RP26
Flow Meter Verification----------------------------------------------------------- 31
RP27
Case Cleaning---------------------------------------------------------------------- 32
RP28
Normal Evaporation Rate Test--------------------------------------------------- 32

Hi Flow Stroller

Table of Contents

RP29
Relief Valve Test------------------------------------------------------------------ 32
Service Tools/Equipment/Supplies---------------------------------------------------------------- 33

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X
1 Troubleshooting Chart
1. These procedures are designed to be performed only by qualified personnel with proper equipment.
2. Any failure during routine maintenance checks will refer you to this section. See troubleshooting chart for appropriate procedure.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

Hi Flow Stroller

Introduction

16

X Troubleshooting Chart
1)

Probable Cause

Unable to start fill ora) QDV not properly engaged on
excessivly long fill times
the reservoir

Corrective Action
Make sure the QDV on the portable and reservoir are properlyaligned. Ensure that a downward force is being applied to theportable for top fill. Ensure the portable is completely engaged
for side fill.

b) Reservoir is empty

Swap or re-fill the reservoirc) Vent valve not open

Ensure that the vent valve lever is fully in the open position.
The lever must be open to begin a fill.

d) FCV is open

Be sure that the FCV knob is in the off (“0”) position. If thevalve is open, fill times can increase.

e) Reservoir saturation pressure is
too low

Swap reservoirs or allow the reservoir time to stabilize and buildpressuref) Vent valve is obstructed

Inspect the vent tubes for blockages. Clean by blowing out withcompressed gas or replace parts if necessary.

g) Leak in the system

Check the portable for leaks (RP18) and repair if needed.

h) QDV damaged or faulty

Inspect the QDV and be sure the poppet opens properly andsmoothly. If necessary, replace the QDV (RP15 or RP16)i) Faulty vent valve

Replace the vent valve (RP19)

2)

Liquid leaks from thecoupled QDVs during
the filla) Worn or damaged lip seal

Replace the QDV lip seal if top fill (RP16). See reservoir technical manual for replacement of side fill lip seal on reservoir.

3)

Unable to disconnect
the portable from thereservoira) Pop-off assembly not being utilized (Top fill only)

Ensure that the pop-off assembly on the reservoir is being used
(top fill only). Do not use force to separate the QDVs on top fillor side fill.

b) QDVs are frozen together

Leave the units coupled with the vent valve closed and let themsit until they warm up enough to disconnect. Always ensurethat male and female QDV’s are cleaned and dried prior to eachfill.

a) Ice crystal preveting the QDVfrom closing properly.

Engage and disengage the portable onto the reservoir several
times to dislodge the ice crystal. Always be sure that the maleand female QDVs are wiped clean and dry before filling.

b) Dirty or damaged QDV poppet

Replace the QDV (RP15 or RP16)a) Vent valve is not fully closed

Ensure that the vent valve lever is fully in the closed position.

b) The portable has been transported or laid in an improper
operating position

Return the portable to an upright or acceptable operating position and allow several minutes for stabilization.

c) Vent valve is frozen open

Allow the portable to warm until the vent valve can close. Afterthe warm up, allow up to 60 minutes for the portable to stabilize
and build pressure before operating.

d) Faulty vent valve

Replace the vent valve (RP19)4)

5)

Liquid leaks from the
QDV poppet after filling

Liquid leaks from thevent valve tube/outlet

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

Hi Flow Stroller

Symptom17

X Troubleshooting Chart
6)

7)

Excessive venting fromrelief valves (hissing
sound)No Flow

Probable Cause

Corrective Actiona) The portable has been transported or laid in an improper
operating position

Return the portable to an upright or acceptable operating position and allow several minutes for stabilization.

b) Saturation pressure too high.

Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.

c) Relief valve frozen open

Allow the portable to warm and thaw. Attempt to re-fill the
portable.

d) Faulty relief valve

Test the operating pressure (RP25) and replace the relief valve
if necessary (RP22)e) Partial or complete loss of vacuum

Conduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.

a) Portable is empty

Check the contents indicator/level gauge and fill the portable ifneeded.

b) Flow control valve turned off

Ensure the flow control knob is not in the off (“0”) position.

c) Nasal cannula kinked or disconnected

Ensure proper nasal cannula functionality and positioningd) Saturation pressure is too low

Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.

e) Leak in the system

Preform a leak check on the plumbing (RP18). Repair leaks asnecessary.

f) Relief valve is open

Ensure that there is no venting from the relief valves. If there isrefer to the corrective actions for “Excessive venting from relief
valves (hissing sound)”g) Vent valve is open

Ensure that there is no venting from the vent valve outlet/tube.
If there is refer to the corrective actions for “Liquid leaks fromthe vent valve tube/outlet”

Hi Flow Stroller

Symptomh) Blockage in the liquid withdrawal Check the warming coils and withdrawal tubes for blockages.
circuitReplace if necessary.
i) FCV Faulty
8)

Low flow at all LPM set- a) Nasal cannula kinked or leaking
tingsb) Saturation pressure is too low

Replace the FCV (RP20)
Inspect the functionality of the nasal cannula.
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.

c) Leak in the system

Preform a leak check on the plumbing (RP18). Repair leaks asnecessary.

d) PRV faulty

Test the operating pressure (RP25) and replace the relief valve
if necessary (RP22).

e) Blockage in the liquid withdrawal Check the warming coils and withdrawal tubes for blockages.
circuitReplace if necessary.
f) FCV faulty

Replace the FCV (RP20)

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

18

X Troubleshooting Chart
9)

Increased NER

Probable Cause

Corrective Actiona) Saturation Pressure is too highInspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.

b) Leak in the system

Preform a leak check on the plumbing (RP18). Repair leaks asnecessary.

c) Relief valve open

Ensure that there is no venting from the relief valves. If there isrefer to the corrective actions for “Excessive venting from relief
valves (hissing sound)”d) Partial or complete loss of
vacuumConduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.

10) Excessive Frosta) Frost is acceptable
NOTE: Minimal frost
on the case and on theplubming is normal,
especially at higher flow b) High humidity level
rates. This symptomc) Saturation pressure is too highapplies to frost that ismuch greater than what
is normally observed.
d) Leak in the system

11) Unit will not maintainacceptable pressure
when in use

Hi Flow Stroller

SymptomSome frost on the outer case and on the plumbing is acceptable,
especially at high flow rates. This is due to the evaporation of
LOX to gas and the temperature difference between the LOX
and room temperature.
High humidity levels can increase frost accumulation.
Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.
Preform a leak check on the plumbing (RP18). Repair leaks asnecessary.

e) Relief valve open

Ensure that there is no venting from the relief valves. If there isrefer to the corrective actions for “Excessive venting from relief
valves (hissing sound)”f) Partial or complete loss of
vacuumConduct the NER test (RP28) and return the unit to CAIRE,
Inc. if necessary.

a) Saturation pressure is unacceptable

Inspect the saturation pressure of the reservoir used for filling.
Allow at least 30 minutes at no flow for the portable to saturate
properly.

b) Leak in the system

Preform a leak check on the plumbing (RP18). Repair leaks asnecessary.

c) PRV faulty

Test the operating pressure (RP25) and replace the relief valve ifnecessary (RP22).

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

19

X Troubleshooting Chart
Good

Low
Battery
LED

Off/
Spring ScaleOK
QDV Pin

Bad

On

Bad

Replace
Defective Part

Replace*
Battery (RP 2)

Replace QDV(RP 15, 16)

Fill

QDV
Leaks
During Fill

No

QDV
Leaks
After Fill

No

No

Vent
Leaks

Yes

Yes

Yes

Replace Lip
Seal (RP 16)

Empty &
Warm Dewar(RP 14)

Empty &
Warm Dewar(RP 14)Fill

Replace Vent
Valve (RP 19)

Hi Flow Stroller

Case
Visual

Yes

No

OK

Meter 1
LED onNo(0 LED)

Yes

No(2–8 LED)

No
QDV
Leaks
After Fill

Replace*
Battery (RP 2)

Calibrate
Meter

Meter
Indicates
8 LEDsYes

Empty &
Warm Dewar(RP 14)
Meter 1
LED OnYes
No(0 LED)No
Replace QDV(RP 15, 16)
Capacitance
Test (RP 7)
High

Empty &
Warm Dewar(RP 14)

Good

Low
RemoveManifold(RP 9)

Clean/Dry
Probe &
Dewar (RP 11)

CalibrateMeter(RP 5, 6)

No(1–7 LED)

Good
Wire
BrokenNo

Replace FeedThru (RP 10)

Yes

Resolder Wire
(RP 10)Capacitance
Test (RP 7)

Meter 1
LED OnBad

No

Replace
Manifold (RP9)

Replace Meter(RP 8)

Yes

Empty &
Warm Dewar(RP 14)

CalibrateMeter(RP 5, 6)

Bad

Capacitance
Test (RP 7)
Good

Reinstall
Manifold(RP 9)*see NOTE in RP 2

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

20

X Troubleshooting Chart
Hi Flow Stroller

Yes

Suspected
Poor NERNo

Yes
Let Sit 16–18
Hours

Test Flows(RP 24)
Fail

Test
OperatingPressure (RP
25)

Pass

Meter
Indicates
4–8 LEDs

Pass

Empty &
Warm Dewar(RP 14)

Yes

Fail Low

Fail HighNo

Empty &
Warm Dewar(RP 14)

Empty &
Warm Dewar(RP 14)

Clean Case
(RP 27)

Test
Flowmeter(RP 26)

Empty &
Warm Dewar(RP 14)

Pass

Plumbing
Leak Test(RP 18)Calibrate
Meter (RP 5,
6)

Replace PRV(RP 22)

Empty &
Warm Dewar(RP 14)

Empty &
Warm Dewar(RP 14)

Replace PRV(RP 22)

Replace FCV(RP 20)Replace
Flowmeter (RP26)

File Records
Fail

RefillPass

Repair Leak
Return Unit toServiceFail

Let Sit 16–18
Hours

Meter
Indicates
4–8 LEDs

Fail

Pressure
Retention
Test (RP 17)

Pass
Yes

No
RefillReplace Dewar

Wait 4 Hours
Pressure
Retention Test
(RP 17)

Pass

Fail

Plumbing Leak
Test (RP 18)

Pass

Fail

Repair Leak

To use the Troubleshooting Chart:• Start at the upper left corner.
• Unless otherwise noted by the arrows, the flow through thechart is down or to the right.
Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

21

X Repair Procedures
RP2 – Liquid Level Meter Battery RR

The following procedures have been carefully prepared to allow
proper removal and replacement of defective components andshould be used in conjunction with the Troubleshooting Chart andthe tests listed in this section.

NOTE: Tampering with meter battery housing will void the meter’s 2-year warranty. If meter battery failure occurs while underwarranty, contact customer service to obtain a replacement meter. If the meter battery is no longer under warranty, the CR2032
coin cell battery may be replaced following the steps below.

WARNING: Make sure the unit is empty and vent valve is open
before replacing any component, except case assembly components or lip seals.
WARNING: The technician’s hands, tools, and clothing should befree of all oils and greases.
WARNING: Parts that are welded in place must not be replacedin the field. Should these parts fail, return complete assembly or
sub-assembly to factory for repair. DO NOT use solder or silver
solder to repair broken welds.
WARNING: The manufacturer of fluorolubricant warns users not
to allow fluorolubricant to contaminate tobacco products. Wash
fluorolubricant from hands before smoking.
WARNING: Do not use glue type thread locking compounds orunapproved sealants on any repairs.
CAUTION: When replacing components, make sure the new part isoriented exactly the same as the original part prior to installation.

Hi Flow Stroller

RP1 – Generala. Expose Gen 4 meter by removing shoulder strap, unzipping thetwo top zippers then easing back the top cover.
b. Remove 2 Phillips head screws and turn meter over.
c. Using a pair of pliers, grasp the battery cover on the back of themeter. Twist and pull the cover away from the meter.
d. Slide the tip of a flat head jeweler’s screwdriver beside the battery
and carefully pry out the battery.
e. Insert new battery with the positive terminal facing up.
f. Apply a thin coating of fluorlubricant to the o-ring.
g. Replace battery cover by pushing it into the back of the meter’scase, ensuring the o-ring seals evenly to restore the air-tight seal.
Replace meter on bracket.
FIGURE 6: Liquid Level Meter Battery

CAUTION: Some components require a specific amount of torquewhen assembling. Follow torque requirements where specified.
NOTE: All replacement parts must be factory approved, cleaned
for oxygen service, and stored in sealed plastic bags. The repair
area must be clean and separate from other areas. Room air should
be filtered, and free from dust, soot, and other contaminants.
NOTE: When replacing components with pipe threads, use PTFE
tape thread sealant. Apply two rounds of PTFE tape to threads
near end of component, avoiding first thread.
NOTE: When assembling new compression fittings, tighten 1/8”,
1/4” and 1/2” nuts eight flats past finger tight and 3/16” nuts fiveflats past finger tight. When reassembling previously used compression fittings, tighten nuts one to two flats past finger tight.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

22

X Repair Procedures
RP3 – Condensate Pad R/Ra. Unzip bottom case zipper.
b. Remove condensate pad and wring out any absorbed moisture. Allow pad to dry completely or dispose (if pad will not
be reused).

Hi Flow Stroller

FIGURE 7: Top Cover Assemblyc. Replace condensate pad and rezip condensate cup.
RP4 – Soft Case R/R
a. Remove strap from the top of the unit.
b. Unzip the top and side zippers.
c Carefully remove the unit from case.
d. To replace, reverse the above steps

CAUTION: Be careful not to pinch wires!

FIGURE 8: Bottom and Side CoverHi Flow Stroller Technical Service Manual • PN 14314465 Rev F

23

X Repair Procedures
a. Completely empty dewar.
NOTE: The meter must first be calibrated empty and then the
span must be set for your particular model. The unit must be
empty, warm, and dry for calibration.

LED 8

LED 1

b. Allow dewar to warm to room temperature.
c. Enter Calibration Mode

Hi Flow Stroller

FIGURE 9: G4 Meter

RP5 – G4 Meter Empty Capacitance Calibration (Figure 9)

Calibrate Button(Hidden)

1. Press and hold the hidden calibrate button located on thecenter of the meter face.

Operate Button

2. While holding the calibrate button, press and hold thegreen operate button.
3. Continue holding both buttons until LED 1 and LED 8 alternately flash. The meter is now in calibration mode.
4. Release both buttons.
d. Press and hold the hidden calibrate button for 3 seconds. LED
1 will flash for 3 seconds followed by a short pause.
NOTE: Step d must be performed within 45 seconds or calibration mode will exit.

TABLE 2: Calibration Error Codes
Error CodeLED 1 & LED 4

Reason for Fault

Solution

Empty to full span is Ensure tank is empty.
too low.
Recalibrate.

e. If successful, LED 1 will flash again for 3 seconds and exit
calibration mode storing the new empty value.

LED 2 & LED 3

Open Circuit

Check meter connections
and wire integrity.

f. If calibration is unsuccessful, multiple LEDs will flash. The
LEDs indicate what error has occurred (see Table 2).

LED 6 & LED 7

Empty capacitanceis too high.

Remove moisturefrom inner vessel.
Decontaminate probe.

LED 5 & LED 8

Empty to full span is Ensure tank is empty.
too high.
Recalibrate.

LED 2, LED 4 &
LED 6High CapacitanceLED 1, LED 3,
LED 5 & LED 7

Calibrated full value
Dry harrness assembly.
less than empty
Decontaminate.
value.

RP6 – G4 Meter Span Setting Adjustment (Figure 9)
a. Enter Calibration Mode

Remove moisturefrom inner vessel.
Decontaminate probe.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

24

X Repair Procedures
FIGURE 10: Manifold Capacitance Test Setup
Ground

2. While holding the calibrate button, press and hold the green
operate button.
3. Continue holding both buttons until LED 1 and LED 8 alternately flash. The meter is now in calibration mode.

Hi Flow Stroller

1. Press and hold the hidden calibrate button located on thecenter of the meter face.

4. Release both buttons.
b. Press the green operate button 3 times within a 5 second period.
NOTE: Step d must be performed within 45 seconds or calibration mode will exit and the meter will NOT be calibrated properly. The calibration procedure will then need to be repeated fromthe beginning.
c. One of the meter LED’s will light continuously.
d. Press the hidden calibrate button until the LED which matches
the Hi Flow Stroller being calibrated is continuously lit. See
Table 3 below for the correct LED setting for your unit.
e. Once the correct LED for your unit is lit, press the green operate button to store the setting and exit calibration mode.

RP7 – Manifold Capacitance Test (Figure 10)
a. Capacitance Meter Setup:
1. Connect wire adapter with jumper wire (Item D) to capacitance meter, following color code.
2. Turn on capacitance meter and select 200 pF range.
TABLE 3: Preset Capacitance Span LED Setting
ModelHigh Flow Stroller

LED Setting
LED 8

3. Move zero adjustment on front of meter until display reads
zero.
b. Capacitance Test:WARNING: Make sure the unit is empty, dry, and at room temperature before testing.
1. Remove shoulder strap, unzip the top case zipper, and fold the
top flap back in order to access manifold harness connection.
2. Connect wire adapter (Item D) to manifold harness connection (Item A).
3. Connect alligator clip to bracket or any other properly
grounded surface.
4. Read manifold capacitance and verify that it is 145–180 pF. If it
does not meet specifications, call Technical Support.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

25

X Repair Procedures
RP10 – Resolder Feed-thru Wire (Figure 11)

a. Remove shoulder strap, unzip top case zipper, and fold back top
flap.

a Remove manifold assembly (See RP 9).

b. Remove 2 meter mounting screws.
c. Remove meter assembly.
d. Unplug the wiring connection.
e. Disconnect ground wire spade terminals.
f. To replace G4 meter, reverse above procedures.
CAUTION: Be careful not to pinch wires!

b. Strip approximately 1/8” (0,3 cm) of insulation from feed-thru
wire if necessary.
c. Apply small amount of Stay-Clean flux to tinned area of probe
using a cotton swab.

Hi Flow Stroller

RP8 – G4 Meter RR

d. Resolder feed-thru wire to tinned area of probe. Add small
amount of lead-free solid wire solder if necessary.
e. Clean flux residue with distilled water and cotton swab. Dry
thoroughly.
f. Replace manifold following listed procedure (RP9).

RP9 – Manifold Assembly RR (Figure 11)
WARNING: The unit must be empty, warm and vented before
starting procedure.

FIGURE 11: Feed-thru Wirea. Remove soft case and Gen 4 meter. (RP 4,8).
b. Remove (3) bracket screws (Item 29) and lift bracket (Item 28)
from manifold.
c. Loosen and disconnect breathing coil nut (Item 38) from withdrawl fitting and FCV (Item 24). Be careful not to bend or kink
Teflon® tubing.
d. Loosen and disconnect primary relief valve tube (Item 46) andvent outlet tube from manifold fitting.
e. For top fill units, loosen and remove QDV tube from manifold
fitting.
f. Use a hex wrench to loosen and remove the (4) manifold retaining
screws (Item 31).
g. Remove manifold assembly (Item 41) by lifting straight up.
i. To replace manifold, reverse above procedure.
NOTE: If substantial force is required, closely examine wire andprobe for damage.

NOTE: Ensure proper seating of O-ring in dewar. Apply small
amount of fluorolubricant to O-ring before assembly. Torquemani-fold mounting screws (Item 31) to 21–23 in-lbs (237–260 Ncm) us-ing cross-tightening method.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

26

X Repair Procedures
Procedure 1:
a. Empty and warm dewar per RP 14).
b. Open vent valve.
c. Loosen feed-thru nut and remove harness.
d. After vent valve (Item 50) is thawed, if all moisture is not removed, continue with procedure #2.
Procedure 2:
a. Remove manifold assembly (See RP 9).
b. Blow off probe assembly with clean, dry nitrogen gas.

RP16 – QDV and Lip Seal RR (Top Fill) (Figure 13)
WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4).
b. Remove two retaining nuts and lift bottom fill tube out of coil.

Hi Flow Stroller

RP11 – Clean/Dry Probe and Dewar

c. Replace QDV by substituting old QDV (Item 62) with the newone, tightening Item 57 to 140–150 inch-lbs (1550–1700 N-cm)
and Item 58 to 300 inch-lbs (3000 N-cm).
d. Replace lipseal by removing Item 65 and Item 64. Apply a thinfilm of fluorolubricant to new Item 64 and insert into QDV.
Tighten Item 65 to 140–150 inch-lbs (1550–1700 N-cm).

c. Blow out inside of dewar with clean, dry nitrogen gas
until inside is clean and dry.
d. Replace manifold assembly (See RP 9).
RP12 – LOX Fill
Refer to POI for proper fill procedure.

FIGURE 12: Side Fill QDVNOTE: Filling source must contain a minimum of 5 liters ofproperly saturated LOX.
RP13 – Liberator Lip Seal RR (Side Fill)
Refer to Liberator Service Manual.
RP14 – Empty and Warma. Turn FCV knob to highest flow setting.
b. Allow unit to sit for 24 hours before proceeding.
RP15 – QDV RR (Side Fill) (Figure 12)
WARNING: The unit must be empty and vented before starting procedure.

FIGURE 13: Top Fill QDVa. Remove soft case (RP 4).
b. Loosen QDV retaining nut (Item A).
c. To replace QDV, reverse above procedure, aligning pin in the
upright position. Apply thin film of fluorolubricant to O-ring(Item 36). Torque retaining nut to 140–150 inch-lbs (1550–1700N-cm).
d . Replace soft case (RP 4).

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

27

X Repair Procedures
FIGURE 14: Plumbing Tests Set-up

b. Assemble pressure gauge (Item J) and adapter assembly. Threadhose barb onto pressure gauge (use Teflon® tape). Push tubing
onto hose bard and attach with clamp.
c. Connect gauge assembly (Item J) to hose barb on FCV outlet.
Open FCV (Item 24) to highest flow setting.

Hi Flow Stroller

RP17 – Pressure Retention Test (Figure 14)
a. Assemble oxygen regulator, pneumatic adapter and hose.
Connect assembly to oxygen gas source.

d. Connect the proper pneumatic adapter to QDV (Item 37) forside fill units or (Item 62) for top fill.
e. Increase pressure to 19 psig (1,3 bar).
f. Turn FCV valve (Item 24) to Off setting.
g. Allow unit to sit undisturbed for 60 minutes.
h. Turn FCV valve (Item 24) to highest flow setting.
i. If pressure gauge (Item J) is at or above 10 psig (0,7 bar), unit
passes test.
RP18 – Plumbing Leak Test (Figure 14)
WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4)
b. Assemble oxygen regulator, pneumatic adapter and hose.
Connect assembly to oxygen gas source.
c. Assemble pressure gauge (Item J) and adapter assembly. Threadhose barb onto pressure gauge (use Teflon® tape). Push tubing
onto hose bard and attach with clamp.
d. Connect gauge assembly (Item J) to hose barb on FCV outlet.
Open FCV (Item 24) to highest flow setting.
e. Connect the proper pneumatic adapter to QDV (Item 37) forside fill units or (Item 62) for top fill.
f. Increase pressure to 19 psig (1,3 bar).

FIGURE 15: Vent Valve Assemblyg. Leak test all connections, joints, and valves with leak test solution.
NOTE: PRV (Item 49) and SRV (Item 43) may leak slowly. Repair
all other leaks first and retest for pressure retention before changing
relief valves.
h. Close FCV (Item 24) by turning to Off position. Remove pressuregauge assembly
i. Disconnect pneumatic adapter from QDV.
j. Leak test QDV poppet and FCV outlet.
k. Repair all leaks by following appropriate repair procedures.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

28

X Repair Procedures
RP19 – Vent Valve RR (Figure 15)
WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4).
b. Open the vent valve.

Hi Flow Stroller

FIGURE 16: Breathing Coil and Top Fill QDV Assemblyb. Remove vent valve (Item 16) by turning counterclockwise.
c. To replace vent valve, reverse above procedure. Torque nut to90-100 inch-lbs (1000–1100 N-cm).
RP20 – FCV RR
WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4).
b. Disconnect coils from FCV inlet by loosening compression fitting (Item 44), and removing coils.
c. Remove FCV knob and flow decal.
d. Disconnect and remove the FCV from bracket by removing
two screws.
FIGURE 17: Breathing Coil and Top Fill QDV Assembly

e. Remove SRV from FCV.
f. To replace FCV, reverse above procedure. Tighten screws to
4–6 inch-lbs. (45–70 N-cm). Record FCV serial number.
RP21 – SRV RR
a. Remove soft case (RP 4).
b. Disconnect SRV from FCV (Item 24).
c. Replace SRV in reverse order. When reassembling SRV,
tighten approximately 10 to 20 degrees after the SRV contacts
the FCV body (20-30 inch-lbs, 225-350 N-cm minimum).
RP22 – PRV RR (Figure 18)
a. Remove soft case (RP 4).
b. Remove PRV (Item 49) while holding adapter (Item 48).
c. Replace the PRV using two rounds of Teflon ® tape on thethreads and tighten 6-7 flats past snug.
d. Reassemble in the reverse order.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

29

X Repair Procedures
FIGURE 18: PRV, Breathing Coil and QDV Assembly

WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4).
b. Loosen the two compression fitting nuts (Items 38 and 44)
from liquid withdrawl fitting (Item 41) and FCV (Item 24).
Disconnect breathing coil (Item 67), being careful not to kinkbreathing coil or internal Teflon® tube.

Hi Flow Stroller

RP23A – Breathing Coil RR (Side Fill) (Figure 18)

c. Carefully remove breathing coil outlet from around top of dewar.
d. To replace breathing coil, reverse above procedure.
CAUTION: The vaporizer coil is fragile. Do not drop coil. Do not
hit or mar coil with wrenches.

RP23B – Breathing Coil RR (Top Fill) (FIgure 19)
WARNING: The unit must be empty and vented before starting procedure.
a. Remove soft case (RP 4).
b. Loosen the two compression fitting nuts (Items 38 and 44)
from liquid withdrawl fitting (Item 41) and FCV (Item 24).
Disconnect breathing coil (Item 67), being careful not to kinkbreathing coil or internal Teflon® tube.

FIGURE 19: Breathing Coil and Top Fill QDV Assemblyc. Loosen QDV tube (Item 56) nut.
d. Loosen QDV jam nut (Item 58). Remove QDV (Item 62) fromfill tube.
e. Cut two cable ties holding coil in place. Remove breathing coilby sliding straight down from fill line. Be careful to properly
remove breathing coil outlet from around top of dewar.
f. To replace coil, reverse above procedure. Tighten QDV jamnuts to 140–150 inch-lbs. (1550–1700 N-cm).

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

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X Repair ProceduresRP24– Flow Rate Testing (Figure 20)

M

a. Unit must be at least 1/2 full with correctly saturated LOX.

24

N

b. Set FCV to 2 LPM setting and allow unit to operate for 20–60
minutes.

Jc. Connect FCV outlet (Item N) to flowmeter inlet (Item M)
with respiratory tubing. Make sure flowmeter outlet is open,
unobstructed, and properly positioned.

Hi Flow Stroller

FIGURE 20: Flow Rate and Pressure Test

d. Test flow rate at each FCV position. Record all flow rates.
e. Flow rates must be nominal valus within tolerances listed in
specification section of this manual or unit fails flow rate test.
NOTE: Be careful to allow for accuracy tolerances of flowmeter.
RP25 – Operating Pressure Test (Figure 20)
a. Assemble pressure gauge and adapter assembly (Item J).
Thread hose barb onto pressure gauge (use Teflon ® tape).
Push tubing onto hose barb and attach with clamp.
b. Connect gauge assembly (Item J) to hose barb on FCV outlet.
Open FCV (Item 24) to highest flow setting.
c. Read operating pressure on pressure gauge (Item J).
NOTE: If testing operating pressure because of improper flow
rates, test immediately after flow rate test.
d. Operating pressure must be 18-22 psig (1.2-1.5 bar) or unit
fails test.
RP26 – Flow Meter Verificationa. Flow meter accuracy is best verified by a calibration laboratory. Equipment should indicate liter per minute oxygen gas
at atmospheric pressure and 21°C (70° F).
b. Flow meter accuracy may also be tested by comparison to one
or more new, unused, calibrated flow meters. This method
will increase confidence in accuracy of readings, but not necessarily verify accuracy.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

31

X Repair Procedures
NOTE: Clean case only after unit is empty and warm. Do notclean in oxygen enriched atmosphere.

RP29 – Relief Valve Test
FIGURE 21: Relief Valve Test

a. Clean using household glass cleaner or Simple Green D andlint-free cloth. Do not get glass cleaner inside case or onto any
plumbing components. Simple Green D is available at www.
simplegreend.com

Hi Flow Stroller

RP27 – Case Cleaning

b. If necessary, a soft bristle brush can be used to help remove dirt
and debris. If desired, Caire, Inc. Technical Service can supply a specific list of additionale reccommended cleaning tools.
c. Allow unit to dry thoroughly before filling.
NOTE: Only use disinfectants or cleaning agents approved
for use with this equipment by CAIRE such as Sporicidin®,HydroPure®, Hydroklean®, or others as specified by CAIRE.
RP28 – Normal Evaporation Rate Testa. Fill unit following procedure found in the Patient Operating
Instructions (POI).
b. Push button and check that all 8 LEDs are on, or verify thatthe spring scale reads full.
c. Check for leaks in QDV and vent valve.
d. Let unit sit 16–18 hours.
e. Make sure FCV and vent valves are closed.
f. Do not move unit during this time.
g. If the Hi Flow is at least half full (4 LEDs), the unit passes.
Maximum loss rate prior to dewar servicing is 1.75 lbs./day(0,8 kg/day).

WARNING: The unit must be empty, warm and vented before
starting procedure.
a. Remove case (RP4).
b. Assemble pressure gauge (Item J) and adapter assembly. Threadhose barb onto pressure gauge. Push tubing onto hose barb andattach with clamp.
c. Assemble oxygen regulator, hose and pneumatic adapter.
Connect assembly to oxygen gas source. Connect pneumatic
adapter to unit QDV (Item 37 or 62).
d. Slowly begin increasing pressure to between 1,35-1,48
bar/19,7-21,5 psig. PRV (Item 49) should begin venting(audible noise will be heard or bubbling will be seen if leaktesting).
e. Slowly begin decreasing the pressure until the PRV (Item 49)
closes, meaning the audible noise is no longer heard or the
bubbling is no longer seen if leak testing. The pressure at which
the audible noise or bubbling is no longer seen should begreater than 1.24 bar/18psig.
f. Hold PRV (Item 49) closed (with finger) and increase pres-sureto 1,9-2,3 bar (27-33 psig). SRV (Item 43) must begin open
(audible venting and/or bubbling of leak test solution).
g. Slowly begin decreasing the pressure until the SRV (Item 43)
closes, meaning the audible noise is no longer heard or the
bubbling is no longer seen if leak testing. The pressure at which
the audible noise or bubbling is no longer seen should begreater than 1,68 bar/24,3 psig.
h. Slowly begin decreasing the pressure in order to release thefinger from the PRV.
Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

32

X Service Tools / Equipment / Supplies
1. Hex Wrenches (various sizes)

Tools and Accessories available from CAIRE, Inc.

2. Flat Blade ScrewdriverPart No

Description

3. 5/16” Nut Driver

CA200071

240 AC Fluorolubricant

4. Open End Wrenches (1/2” to 1-1/8”)

CA200072”Snoop” Leak Detection Fluid

5. Side Cutters

CA400004

Replacement Filter/Male Transfer Line Adapter

6. Phillips Screwdriver

CA406308

7. Pliers

CA406310

10.3 bar (150 psi) Relief Valve Assembly
Teflon® Tape

CA406398

10.3 bar (150 psi) Relief Valve only

14314465

Service Manual

13214825

AirLift Backpack

10018138

C1000 Backpack

97112026

Female Side Fill Pneumatic Test Adapter

97200076

Erie “Liter Meter”

97217007Pressure Gauge Adapter

97212021

Male Side Fill Pneumatic Test Adapter

97403015

Capacitance Meter

97403016

Jeweler’s Screwdriver

97405279

Pneumatic Hose with DISS Fittings

97403574

Dewar Cap

97403577

0-4.1 bar (0-60 psig) Pressure Gauge

7. 02 Gas Source (High Pressure bottle)

12917730

Stroller Cart

8. 02 Liquid Source

97405147

0–45 psig Oxygen Regulator

9. N2 Gas or Clean, Dry Compressed Air Source

97405431

Liquid Oxygen Transfer Line – 2 m (6 ft)

10. Tubing (02 compatible)

97404564

Transfer Line Swivel Connector

Required Supplies

97405590

Lip Seal Service Tool

1. Stay-Clean Flux

97406471

Tandem Tee Kit

2. Cotton Swabs

97406555

Super Flex Liquid Oxygen Transfer Line – 6’

97406630

Dual Fill Head Tee

13329091

G4 Capacitance Meter Adaptor Kit

8. Torque Driver/Wrenches:
12-17 N-cm (10-15 in-lbs)
23-29 N-cm (20-25 in-lbs)
69-92 N-cm (60-80 in-lbs)
104-115 N-cm (90-100 in-lbs)
6.2-6.9 N-m (45-50 ft-lbs)
9. Jeweler’s Screwdriver
Required Fixtures/Equipment
1. Capacitance Meter
2. Soldering Iron
3. Oxygen Regulator/Hose Kit
4. Pressure Gauge
5. Pressure Gauge Adapter
6. Flowmeter

3. Lead-free Solder
4. Distilled Water
5. Household Glass Cleaner

Hi Flow Stroller

Required Tools

6. Lint-Free Cloth
7. Teflon® Tape
8. Fluorolubricant
9. Leak Detection Fluid

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

33

XI
1 Parts Price List

to obtain your parts list.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

Hi Flow Stroller

Contact Customer Service or visit
www.caireinc.com

34

XI Ordering Information
The following steps should be used when ordering a new Hi Flow,or replacement parts for an existing unit:
1. Compile a list of all equipment and replacement parts to beordered. An exploded view of assemblies for easy parts identification, along with parts/price lists can be found on www.cairemedical.com.
For US/Canada Part Numbers, please call 770 721 7759.
For European Part Numbers, please call +44(0) 1189 367060. For
Asian, Australia, New Zealand Part Numbers, please call +61
297 494333.
2. Fill out a purchase order containing the following information:a. Purchase order number.
b. Name and address of billing location.
c. Name and address of shipping location.
d. Quantity, part number, description, and unit costfor each item ordered.

3. Telephone or fax CAIRE, Inc. at one of the numbers listed below to begin immediate processing of the order:
USA
Toll Free Phone:

800 48 CAIRE
			(800 482 2473)
Toll Free Fax:
888 WE CAIRE(To place an order):		(888 932 2473)
Phone:		770 721 7758
Fax: 		770 721 7759

Hi Flow Stroller

Ordering Information

Asia, Australia, Pacific Rim
Phone:+61 297 494333
Fax:
888-932-2473
EuropePhone:
Fax:+44(0) 1189 367060+44(0) 1189 799245

4. Mail or fax the completed purchase order for
confirmation to:
CAIRE, Inc.
2200 Airport Industrial Drive
Suite 500
Ball Ground, GA 30107
CAIRE Medical Ltd.
Unit 6, Ashville Way
Wokingham, Berkshire, RG41 2PL
United Kingdom
All new equipment will be shipped either “prepaid”, F.O.B. Canton,
Georgia, F.O.B. Bracknell, UK, or collect via your specified carrier.
All replacement parts will be sent by UPS “prepaid”, and the shipping charges for equipment and parts will be added to the final invoice. Payment for replacement parts are located on CAIRE, Inc.’s invoice with payment date indicated. All shipments will originate from
Canton, Georgia or Bracknell, UK. If a particular carrier or method of
shipment is desired, specify when placing order.

For additional ordering and contact information, visit www.caireinc.com
Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

35

XII Restocking Policy
If a problem with the unit should be encountered, reference
should be made to the Troubleshooting Charts on pages 17-21. Ifthese procedures do not provide a solution for the problem, thefollowing steps should be taken:
1. Call CAIRE, Inc. Customer Service. State the problem withthe unit. If it is determined that the problem cannot be solvedby the distributor, a Return Material Authorization (RMA)
number will be assigned to the unit or part(s). If a Purchase
Order Number is to be referenced, please give this number tothe Customer Service Representative at that time.
2. Carefully package the parts, or repack the unit in its original
shipping container, precisely as shipped.
3. Write the Return Material Authorization Number on the topof the shipping container.
4. Return the unit or parts by professional carrier to:
CAIRE, Inc.
2205 Airport Drive
Ball Ground, GA 30107
CAIRE Medical Ltd.
Unit 6, Ashville Way
Wokingham, Berkshire, RG41 2PL
United Kingdom
All equipment returned to CAIRE, Inc. must be shipped“prepaid”.
When the defective item(s) is received at CAIRE, it will be serviced and returned to the distributor as soon as possible. A copyof the “Repair Cost Sheet” will be enclosed giving a detailed listingof any maintenance performed.

Restocking Policy
If it becomes necessary to cancel an order with CAIRE, Inc. after the shipment has been received, use the following “Restock
Policy” procedure:
1. Notify the Customer Service Department at CAIRE, Inc. using the toll-free number. When contacting Customer Service
personnel, it will be necessary to relay the following information:

Hi Flow Stroller

When a Hi Flow Stroller is received, it should be inspected immediately, as outlined in Section VII, Unpacking and Setup
Instructions.

a. State the quantity and description of equipment to be returned.
b. Give the Serial Number of each unit to be returned.
c. State the equipment purchase date.
2. An RMA number will be issued in the name of the distributor
by CAIRE, Inc. for the equipment to be returned. When theequipment is shipped to the factory, the RMA number must
appear on the packing slip.
3. All equipment must be returned “prepaid” to the original
shipping location:
CAIRE, Inc.
2205 Airport Drive
Ball Ground, GA 30107
CAIRE Medical Ltd.
Unit 6, Ashville Way
Wokingham, Berkshire, RG41 2PL
United Kingdom
4. Finally, a “Credit Memo”, minus a 15% restocking fee, will
be issued to the distributor when all equipment has been received, inspected, and restocked by CAIRE, Inc.
Return of Unused Non-Defective Merchandise
CAIRE, Inc., at its discretion, charges a 15% restocking fee for unused non-defective merchandise that is returned. A RMA number
must be obtained from CAIRE, Inc. Customer Service prior to
return of any goods. Merchandise cannot be returned for credit
after sixty (60) days. Customer to pay all freight charges. Tracking
capability and insurance on all returned goods is advised. CAIRE,
Inc. will not be responsible for misdirected shipments.

Hi Flow Stroller Technical Service Manual • PN 14314465 Rev F

36

CAIRE Inc.
2200 Airport Industrial Dr., Ste. 500 Ball Ground, GA 30107
U.S.A.

CAIRE Medical Ltd
Unit 6 Ashville Way
Wokingham
Berkshire, RG41 2PL, United Kingdom

CAIRE and CAIRE Inc. are registered trademarks of CAIRE Inc. Please visit our website below
for a full listing of trademarks. Trademarks: www.caireinc.com/corporate/trademarks/.
© Copyright 2021 CAIRE Inc. All Rights Reserved.
CAIRE Inc. reserves the right todiscontinue its products, or change the prices, materials, equipment, quality, descriptions,specifications and/or processes to its products at any time without prior notice and with nofurther obligation or consequence. All rights not expressly stated herein are reserved by us, asapplicable.

www.caireinc.com???? 2021 Hi Flow Stroller Technical Service Manual Ref 14314465 Rev F