INVACARE Models 5LXAW and 5LXO2AW Oxygen Concentrators Service Manual

SPECIAL NOTES

SPECIAL NOTES S P E C I A L N O T E S

WARNING/CAUTION notices used in this manual apply to hazards or unsafe practices which could result in personal injury or property damage. NOTICE THE INFORMATION CONTAINED IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.

WARNING DO NOT OPERATE THIS EQUIPMENT WITHOUT FIRST READING AND UNDERSTANDING THIS MANUAL. IF YOU ARE UNABLE TO UNDERSTAND THE WARNINGS AND INSTRUCTIONS, CONTACT A HEALTHCARE PROFESSIONAL (DOCTOR - THERAPIST) BEFORE ATTEMPTING TO USE THIS EQUIPMENT - OTHERWISE INJURY OR DAMAGE MAY RESULT. SAVE THESE INSTRUCTIONS

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TABLE OF CONTENTS

TABLE OF CONTENTS SPECIAL NOTES ... 2

Replacing Compressor Assembly ... 33

SAFETY SUMMARY ... 4

Replacing Capacitor ... 33

FEATURES... ... 6

PROCEDURE 8 - REPLACING HEAT EXCHANGER ... 34

SPECIFICATIONS ... 7 Recommended End-User Guidelines for Optimum Performance ... 8

PROCEDURE 9 - REMOVING CONTROL PANEL ... 35

SHIPPING AND HANDLING INSTRUCTIONS ... 9

PROCEDURE 10 - REPLACING COOLING FAN ... 36

INSTALLATION / SEQUENCE OF OPERATION ... 10

PROCEDURE 11 - REPLACING P.C. BOARDS ... 38

SENSO2 OXYGEN SENSOR TECHNOLOGY CERAMIC ZIRCONIA SENSOR ... 11

PROCEDURE 12 - REPLACING TRANSFORMER ASSEMBLY ... 40

Technical Description ... 11

PROCEDURE 13 - REPLACING ON/OFF SWITCH ... 41

Operating Sequence ... 11

PROCEDURE 14 - REPLACING FLOWMETER ... 42

Pneumatic Diagram ... 12 TROUBLESHOOTING GUIDE ... 13

PROCEDURE 15 - REPLACING HOUR METER ... 43

REPAIR/REPLACEMENT GUIDE ... 20 PROCEDURE 1 - REMOVING CABINET ... 20

PROCEDURE 16 - REPLACING 4-WAY VALVE/MANIFOLD ASSEMBLY/PILOT VALVES ... 44

PROCEDURE 2 - PREVENTIVE MAINTENANCE ... 21

Replacing 4-way Valve ... 44

Cabinet Filters ... 21

Replacing 4-way Valve Manifold Assembly ... 44

Inlet Filter ... 21 Bacteria Filter ... 21

Replacing Pilot Valve Poppets and "O" Rings ... 46

Exhaust Muffler Canister/ Exhaust Muffler ... 22

PROCEDURE 17 - SENSO2 ALARM INDICATORS AND SWITCH ... 48

Compressor Top End Rebuild - 5 Liter ... 23 Preventive Maintenance Record ... 27

PROCEDURE 18 - TIMING INVACARE 5 CONCENTRATORS ... 49

PROCEDURE 3 - REPLACING P.E. VALVE ... 28 PROCEDURE 4 - REPLACING SIEVE BEDS ... 29

PROCEDURE 19 - LEAK TEST ... 52 PROCEDURE 20 - ALARM AND SENSOR TEST ... 53

PROCEDURE 5 - REPLACING CHECK VALVES ... 30 PROCEDURE 6 - REPLACING/ADJUSTING REGULATOR ... 31

PROCEDURE 21 - SIEVE BED PRESSURE TAP-IN KIT INSTALLATION AND BED PRESSURE CHECK ... 57

Replacing Regulator ... 31

WARRANTY ... BACK PAGE

Adjusting Regulator ... 32 PROCEDURE 7 - REPLACING COMPRESSOR ASSEMBLY OR CAPACITOR ... 33

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T A B L E O F C O N T E N T S

SAFETY SUMMARY

S A F E T Y S U M M A R Y

SAFETY SUMMARY READ THE FOLLOWING INFORMATION BEFORE OPERATING THIS PRODUCT. WARNING The use of oxygen therapy requires that special care be taken to reduce the risk of fire. Any materials that will burn in air, and some that will not, are easily ignited and burn rapidly in high concentrations of oxygen. For safety concerns, it is necessary that all sources of ignition be kept away from the product and preferably out of the room in which it is being used. NO SMOKING signs should be prominently displayed. A spontaneous and violent ignition may occur if oil, grease or greasy substances come in contact with oxygen under pressure. These substances MUST be kept away from the oxygen concentrator, tubing and connections, and all other oxygen equipment. DO NOT use any lubricants unless recommended by Invacare. For optimum performance, Invacare recommends that each concentrator be on and running for a minimum of 30 minutes at a time. Shorter periods of operation may be harmful for maximum product life. If it has a damaged cord or plug, if it is not working properly, if it has been dropped or damaged, or dropped into water, call Qualified Service Personnel for examination and repair. Keep the cord away from HEATED or HOT surfaces. NEVER drop or insert any object into any opening. NEVER block the air openings of the product or place it on a soft surface, such as a bed or couch, where the air opening may be blocked. Keep the openings free from lint, hair and the like. Fill humidifier with water to the level shown by the manufacturer. DO NOT overfill. Invacare recommends that Crush-Proof oxygen tubing (supplied by Invacare) be used with this product and NOT exceed 50 ft. (15.2m) in length. MAINTENANCE The Invacare Oxygen Concentrator was specifically designed to minimize routine preventative maintenance at intervals of once per year. Only professionals of the healthcare field or persons fully conversant with this process such as authorized or factory trained personnel should perform preventative maintenance or performance adjustments on the oxygen concentrator. RADIO FREQUENCY INTERFERENCE Most electronic equipment is influenced by Radio Frequency Interference (RFI). CAUTION should be exercised with regard to the use of portable communications equipment in the area around such equipment.

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SAFETY SUMMARY

SAFETY SUMMARY (CONTINUED) TO REDUCE THE RISK OF ELECTROCUTION. WARNING ALWAYS unplug this product IMMEDIATELY after using. Avoid using while bathing. If continuous usage is required by the physicians prescription: The concentrator must be located in another room at least seven (7) feet from the bath. DO NOT come in contact with the concentrator while wet. DO NOT place or store product where it can drop into water or other liquid. DO NOT reach for product that has fallen into water. UNPLUG IMMEDIATELY.

TO REDUCE THE RISK OF BURNS, ELECTROCUTION, FIRE OR INJURY TO PERSONS. WARNING This device is to be used only in accordance with the prescription of a physician and this Owners Manual. If at any time the patient or attendant conclude that the patient is receiving an insufficient amount of oxygen, the supplier and/or physician should be contacted immediately. No adjustments should be made to the flowrate unless prescribed by a physician. A product should NEVER be left unattended when plugged in. Close supervision is necessary when this product is used by, on or near children or bed confined individuals. Use this product for only intended use as described in this manual. DO NOT use unauthorized parts, accessories or adapters other than those authorized by Invacare.

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S A F E T Y S U M M A R Y

FEATURES

FEATURES F E A T U R E S

Power Indicator Light

SensO2 Status Indicator Lights (5LXO2AW ONLY)

Oxygen Outlet

Flowmeter

Power Switch Cabinet Filter (2) ea. Elapsed Time Meter

5LXO2AW

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SPECIFICATIONS

SPECIFICATIONS STANDARD SPECIFICATIONS Electrical Requirements: Rated Current Input: Sound Level:

230 VAC +10%-15% (264 VAC/197 VAC), 50 Hz 2.0 A 53 dB Average

Operating Altitude:

Up to 6,000 ft. (1828 meters) above sea level without degradation of performance. From 6,000 ft. (1828 meters) to 13,129 ft. (4000 meters) below 90% efficiency.

Ambient Temperature Range:

50OF - 95OF (10O - 35OC)

*Oxygen Output Concentration Levels: 95.6% to 93% at 1-3 L/min. 95.6% to 91% at 4 L/min. 95.6% to 87% at 5 L/min. * Stated performance maximum achieved after 30 min. of run time. Maximum Outlet Pressure:

5 psi + 0.5 psi. (34.5 kPa + 3.45 kPa.) Front Panel Indicators

SensO2 Alarm Thresholds:

O2 Purity Over 85% (+ 2%)

Flow Range:

Internal Switch *Set at 73% GREEN Indicator Light

73% (+ 3%) to 85% (+ 2%)

YELLOW Indicator Light

Below 73% (+ 3%)

RED Indicator Light Continuous Audible Alarm Sieve-GARDTM with Compressor Shutdown

1/2 - 5 L/min. For flow rates less than 1/2 L/min., use the Invacare Pediatric Flowmeter PF16.

Power Consumption:

390W

Pressure Relief Mechanism Operational at:

35 psi + 3.5 psi (241 kPa + 24.1 kPa)

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S P E C I F I C A T I O N S

SPECIFICATIONS S P E C I F I C A T I O N S

SPECIFICATIONS, CONTINUED Filters:

Cabinet Compressor Inlet Bacteria

Safety Systems:

Current overload or line surge shutdown. High temperature compressor shutdown. High pressure alarm w/compressor shutdown. Low pressure alarm w/compressor shutdown. Battery FreeTM Power Loss Alarm. SensO2 Oxygen System.

Width: Height: Depth:

18-inches (45.7 cm) 23.75-inches (60.3 cm) 14-inches (35.6 cm)

Weight: Shipping Weight:

54 lbs. (24.5 kg) 59 lbs. (26.8 kg)

Operating Temperature Exhaust: Oxygen Output:

Less than Ambient + 35O F (+16O C) Less than Ambient + 4O F (+2O C)

Cabinet:

Impact Resistant flame-retardant plastic cabinet.

Regulatory Listing:

Compliance with ISO 8359, EN 60601.

RECOMMENDED END-USER GUIDELINES FOR OPTIMUM PERFORMANCE: Temperature:

50O - 95OF (10O - 35OC)

Electrical:

No extension cords.

Placement:

No closer than 3-inches (7.6 cm) from any wall.

Tubing:

Crush-Proof Tubing - 50 feet (15.2 m.) maximum (do NOT pinch).

Room Characteristics:

Smoke and soot-free No confined spaces (closet).

Relative Humidity:

20 to 60%

Time of Operation:

Up to 24 hours per day.

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SHIPPING AND HANDLING

SHIPPING AND HANDLING INSTRUCTIONS This Service Manual describes, in detail, the Invacare 5 Oxygen Concentrator. It has been carefully written to explain concentrator operation, service and preventative maintenance. Before you install and operate the concentrator, please refer to OWNER'S MANUAL. The Invacare concentrator should always be kept in the upright position to prevent cabinet damage while being transported. The shipping container has been designed to assure maximum protection of the concentrator. If the concentrator is to be reshipped by common carrier, it should be packed in a new carton. Additional cartons are available from Invacare. The air compressor suspension system has been engineered to withstand severe motion and orientation.

UNPACKING (FIGURE 1) 1. Check for any obvious damage to the carton or its contents. If damage is evident, notify the carrier, or Invacare. 2. Remove all loose packing from the carton. 3. Carefully remove all the components from the carton.

NOTE: After inspection, unless the Invacare Oxygen Concentrator is to be used immediately, retain carton and packing materials for use in storing until use of the concentrator is required.

INSPECTION 1. Examine exterior of the Invacare Oxygen Concentrator for nicks, dents, scratches or other damages. Inspect all components. STORAGE 1. Store the repackaged Invacare Oxygen Concentrator in a dry area. 2. DO NOT place other objects on top of the repackaged concentrator.

Relief for Flowmeter to face Front of Unit.

Relief for Line Cord to face Back of Unit.

FIGURE 1 - UNPACKING 9

S H I P P I N G / H A N D L I N G

INSTALLATION/SEQUENCE OF OPERATION

INSTALLATION/SEQUENCE OF OPERATION I N S T A L L A T I O N

INSTALLATION/VERIFICATION OF BATTERY FREETM POWER LOSS ALARM When your new Invacare concentrator arrives, it should be checked for proper operating conditions. 1. If the unit has been in below-freezing temperatures, allow it to warm up to room temperature (approximately 30 minutes) before operating. 2. The concentrator will need to be turned on for 4 to 5 seconds to charge the Battery FreeTM Power Loss Alarm. Connect power cord to outlet and turn the concentrator on. Turn flow control knob counterclockwise and flow will begin immediately. Set to 5 L/min. Turn unit off. 3. Unplug the power cord and press On/Off switch to the ON position. An intermittent audible alarm will sound. This confirms proper operation of the Battery FreeTM Power Loss Alarm. Turn On/Off switch OFF. 4. Connect cord to outlet and turn on concentrator. Unit will sound 3 BEEPS on startup. 5. Check the oxygen concentration per specifications after 30-40 minutes running time.

S E Q U E N C E O F O P E R A T I O N

SEQUENCE OF OPERATION Applying 230 VAC via the power switch energizes the compressor motor, hour meter, cooling fan and the printed circuit (P.C.) board. Room air enters the compressor via the cabinet filter, compressor inlet filter, and sound muffler. The air is compressed by the wobble pistons in the compressor to a pressure of 21 PSI (144.79 kPa). As increased pressure creates increased temperature, a heat exchanger is utilized to lower the temperature by 20O F (6.7O C) before the air enters the 4-way valve. It is then channeled to a sieve bed containing the adsorption material. A restrictor downstream of the sieve bed causes pressure to build up inside the sieve bed which is necessary for the adsorption process. A small amount of relatively pure oxygen enters the top of the second bed with the balance entering a storage tank. The nitrogen removed is exhausted back from the bed through the four-way valve into room air. A muffler is located at the exhaust end of the valve to muffle the sound of the exhaust as it exits the concentrator. The oxygen not being used to exhaust is channeled into the storage tank. The pressurized oxygen is regulated down to 5 PSI (34.4 kPa), enters an accurate flow-measuring device, flows through a bacterial filter and out to the patient. The electrical activation of the 4-way valve is accomplished every 8 to 21 seconds by the pressure sensor and P.C. board electronics when the pressure set point of 21 + 3 PSI (144.79 + 51.32 kPa) is reached. The time between cycles is dependent on altitude, flow rate and internal environmental factors. On the 5LXAW/5LXO2AW, a P.E. or Pressure Equalization valve opens just prior to the shift of the 4-way valve. This allows highly concentrated oxygen to enter the just exhausted bed from the top. This additional pressure allows the bed to start its cycle at a higher pressure. The P.E. valve will close just after the shift of the 4-way valve.

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INSTALLATION/SEQUENCE OF OPERATION

INSTALLATION/SEQUENCE OF OPERATION, CONTINUED If main power is lost, the Battery Free Power Loss Alarm will sound a short "beep", with a long pause, intermittently. All units are equipped with a diagnostic alarm system that signals if the pneumatic pressure or electrical systems malfunction. The Troubleshooting Guide explains the alarm system signals and reasons in detail for your convenience. TM

SENSO2 OXGYEN SENSOR TECHNOLOGY CERAMIC ZIRCONIA SENSOR Technical Description The oxygen being produced by the concentrator flows out of the product tank through a precision orifice to the oxygen sensor mounted on a printed circuit board. As the oxygen enters the sensor, it passes through a screen and contacts the sensing disk. O

Electric current flowing through a metal film resistor heats the disk in excess of 300 C. Oxygen molecules contact the electrode of the disk and pick-up extra electrons to become oxygen ions. These oxygen ions are attracted to the electrode on the bottom of the zirconia disk. Because of the crystal structure of the zirconia, only oxygen ions can pass through. When the oxygen ions reach the bottom electrode, the extra electrons are released from the oxygen ions and oxygen molecules return to the air. The number of electrons is directly related to the oxygen concentration. The electrons travel to the PC board where they are "counted" and the oxygen concentration "reading" is calculated. A microprocessor on the P.C. board contains software that interprets the signal being received from the sensor. It compares the signal to clinically acceptable limits. Signals outside of the clinically acceptable limits generate a response in the form of lighted LEDs, audible indicators, and/or system shut-down.

Operating Sequence Once the power switch has been turned ON, the SensO2 circuit will wait 5 minutes for the concentrator to begin producing clinically acceptable oxygen before activating. No LEDs will illuminate for at least 5 minutes. After 5 minutes, if the oxygen purity exceeds 85% + 2% the GREEN LED will illuminate. If the oxygen level is not above 85% + 2% after the first 5 minutes, LEDs will remain off. The system will wait for a maximum of 30 minutes from start-up to reach 85% + 2% before activating an alarm. Environmental factors such as low voltage, high altitude, or age of the machine will affect the time required to reach 85% + 2%. If the oxygen level is not above 85% + 2% within the first 30 minutes, the oxygen concentration alarm sequence will activate. When oxygen concentration is above 85% + 2%, the sensor measures oxygen purity every 10 minutes. If a reading falls below 85% + 2%, the oxygen sensor measures purity continuously and a yellow LED will illuminate. If the oxygen purity falls below 73% + 3% the RED LED/Alarm/Shut-Down mode will activate.

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I N S T A L L A T I O N

S E Q U E N C E O F O P E R A T I O N

PNEUMATIC DIAGRAM P N E U M A T I C D I A G R A M

PNEUMATIC DIAGRAM TEST POINT 2 (BETWEEN PRODUCT TANK AND CHECK VALVE)

BACTERIA FILTER

CHECK VALVES FLOWMETER PRESSURE REGULATOR

TEST POINT 1 (OXYGEN CONCENTRATOR OUTLET)

RESTRICTOR is INTERNAL to P.E. VALVE

PRODUCT TANK

P.C.BOARD

OPTIONAL OXYGEN SENSOR (Mounted on P.C. Board)

P1

RESTRICTOR CROSSOVER ASSEMBLY

SIEVE BED

SIEVE BED P.E. VALVE

AIR INLET

CABINET (GROSS PARTICLE) FILTER COMPRESSOR INLET FILTER

SOLENOID PILOT VALVE

4-WAY VALVE

RELIEF VALVE EXHAUST MUFFLER

RESONATOR

HEAT EXCHANGER

AIR COMPRESSOR

LEGEND and

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=

ELECTRICAL CONNECTIONS

TROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE SYMPTOM:

PROBABLE CAUSE:

SOLUTION:

NORMAL OPERATION: Internal Status Indicators: RED: Off GREEN: Off Unit plugged in, power switch on. 3 "beeps" on start up.

No problems.

System O.K.

POWER LOSS: Internal Status Indicators: RED: Off GREEN: Off Unit unplugged, power switch on, alarm off.

No problems.

"Battery FreeTM " Circuit drained. Plug in cord and turn power switch ON to recharge.

POWER LOSS: Internal Status Indicators: RED: Off GREEN: Off Unit plugged in, power switch on, alarm off. "Battery FreeTM" circuit drained.

1. No Power at outlet.

1. Check electrical outlet with a table lamp or voltmeter set on 500 VAC scale. If outlet isn't working, check protective device in home's electrical panel or consult an electrician. Also ensure that unit is properly plugged in. DO NOT use extension cords. Move to another outlet or circuit.

2. Power Cord. a. Frayed. b. Broken or damaged spade. c. Spade connector from Power Cord loose or disconnected (inside back of unit). 3. On/Off switch. a. Disconnected wire.

b. Faulty switch.

2a.Replace cord. 2b.Replace power cord connectors on plug. 2c.Reattach connector.

3a.Check all electrical connections to the On/Off switch for any disconnected wires. 3b.If the concentrator does not come on at all and wiring is intact, color code and remove wires one at a time and clean the On/Off switch with contact cleaner while turning the switch on and off. Reinstall switch and turn power on. If switch still doesn't work, replace switch. Transfer wires from old switch to new switch one at a time to the matching contact.

NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES

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T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE SYMPTOM: POWER LOSS, Continued:

PROBABLE CAUSE: 4. Blown 5 AMP fuse.

SOLUTION: 4. Replace 5 AMP fuse located just above the line cord in the rear of the unit

NOTE: Use only 5mm X 20mm 5 A.T.L. fuse The fuse may have blown to safeguard the concentrator during a power surge. If the fuse blows immediately, there is probably a short in the wiring. Check for pinched or charred wiring. If fuse doesn't blow, turn unit on and run it for a couple of hours. If fuse blows during this run, there is probably and internal problem. Contact INVACARE TECHNICAL SERVICE. 5. P.C. Board. a. Damaged. b. Loose or damaged connector. INTERNAL POWER LOSS: Internal Status Indicators: RED: Off GREEN: Off Alarm may or may not be on. Control Panel Indicators: RED: Off YELLOW: Off GREEN: Off Fan operates, power light on, compressor not operating.

1. Transformer Assembly. a. Faulty. b. Connector loose or disconnected. c. Faulty wiring.

HIGH PRESSURE: Internal Status Indicators:

1. P.C. Board. a. Malfunction.

2. P.C. Board. Faulty.

1a.Replace (PROCEDURE 12). 1b.Reattach connector. 1c.Replace Transformer Assembly (PROCEDURE 12). 2. Replace P.C. Board (PROCEDURE 11).

RED: One (1) Flash GREEN : Two (2) Flashes

Control Panel Indicators: RED: On YELLOW: Off GREEN: Off Unit plugged in, power switch on, continuous alarm. Compressor shut down.

5a.Replace (PROCEDURE 11). 5b.Repair or replace connector.

1a.Set flow to max l/min. for concentrator. Check voltage across Pilot Valve 1 on 200 volt scale. If meter reads 0 volts when unit is turned on, replace P.C. Board (PROCEDURE 11).

b. Disconnected Wire.

1b.Check spade connectors on pilot valves 1 and 2 and connectors on P.C. Board.

c. Shifting Valve at Pressures greater than 25 p.s.i.

1c.Replace P.C. Board (PROCEDURE 11).

2. 4-way Valve a. Not Shifting.

2a.If voltage rises to approximately 24 volts D.C. when unit shuts down, P.C. Board is functioning properly. Replace 4-way Valve (PROCEDURE 16).

NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES 14

TROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE SYMPTOM: HIGH PRESSURE, Continued

LOW PRESSURE: Internal Status Indicators: RED: One (1) Flash GREEN : One (1) Flash Unit plugged in, power switch on, continuous audible alarm. Compressor shut down (Failure to cycle due to low pressure).

PROBABLE CAUSE:

SOLUTION:

2. b. Bad Coil.

2b.Replace 4-way Valve (PROCEDURE 16).

3. Sieve Beds. Contaminated.

3. Replace Sieve Beds (PROCEDURE 4).

1. Inlet Filter Dirty or Plugged.

1. Replace Inlet Filter (PROCEDURE 2).

2. Compressor. a. Leaks at fittings or tubing. b. Leaking or defective relief valve. c. Insufficient voltage at outlet. d. Worn Cup Seals or Gaskets. 3. Heat Exchanger a. Leak at tubing or body chamber. b. Inspect tubing and heat exchanger.

2a.Replace or repair. 2b.Repair leak or replace. 2c.DO NOT use extension cords. Use another outlet. 2d.Rebuild Top End of Compressor (PROCEDURE 2). 3a.Replace or retighten. 3b.Replace or retighten tubing. Replace Heat Exchanger (PROCEDURE 8).

4. Regulator cracked or leaking.

4. Replace (PROCEDURE 6).

5. P.E. Valve leaking.

5. Replace P.E. valve. Check volt age at P.E. valve connector on 24 volt D.C. scale. The P.E. valve activates or energizes approximately 1 second prior to the activation of the 4-way Valve with approximately 24 volts. If voltage is in excess of 24 volts consistently, replace the P.C. Board. If the P.C. Board voltage acts normally, replace the P.E.valve (PROCEDURE 3).

NOTE: Check for leaks starting at the compressor output through all the pneumatic connections. Major leaks will cause system pressures to remain below adequate shift (exhaust) pressures and will cause compressor shut down. NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES

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T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE SYMPTOM: LOW CONCENTRATION: NOTE: Check for O2 purity using a calibrated Oxygen Analyzer at Test Point 1 (OXYGEN OUTLET) of the concentrator. SENSO2 UNITS ONLY SHUTDOWN: Internal Status Indicators:

PROBABLE CAUSE: 1. Cabinet Filters Dirty.

1. Clean or Replace (PROCEDURE 2).

2. Inlet Filter Dirty.

2. Replace (PROCEDURE 2).

3. Compressor. a. Defective. b. Faulty Capacitor. c. Bad Motor Windings.

RED: Two (2) Flash GREEN : One (1) Flash

d. Worn Seals.

Control Panel Indicators:

e. Bad Bearings.

RED: On YELLOW: Off GREEN: Off For SensO2 units, the Red indicator will signal extremely low purity and will be accompanied by a continuous audible alarm and system shutdown. Repairs are required.

LOW CONCENTRATION: Internal Status Indicators: RED: Off GREEN: Off Control Panel Indicators: SensO2 ONLY: RED: Off YELLOW: On GREEN: Off

SOLUTION:

f. Leak at fittings or tubing. g. Leaky or Defective Relief Valve. h. Insufficient voltage (outlet). 4. Heat Exchanger. a. Leak at tubing or body chamber. b. Inspect tubing and Heat Exchanger.

3a.Replace Compressor (PROCEDURE 7). 3b.Replace Capacitor (PROCEDURE 7). 3c.Replace Compressor (PROCEDURE 7). 3d.Rebuild Top End of Compressor (PROCEDURE 2). 3e.Replace Compressor (PROCEDURE 7). 3f. Replace Fittings or Tubing. 3g.Replace Relief Valve. 3h.DO NOT use extension cords.

4a.Replace or Retighten. 4b.Replace or retighten tubing. Replace Heat Exchanger (PROCEDURE 8).

5. Regulator Cracked or Leaking.

5. Replace (PROCEDURE 6).

6. Exhaust Muffler dirty or plugged.

6. Replace (PROCEDURE 2).

7. Fan a. Not Operating. Unit overheating.

7a.Leads to fan Disconnected. Reconnect (PROCEDURE 10).

b. Faulty Fan.

7b.Replace (PROCEDURE 10).

8. Sieve Beds defective

8. Replace (PROCEDURE 4).

9. Tubing kinked or blocked.

9. Repair or replace.

10.P.C. Board a. Shifts at wrong pressures.

A Yellow indicator signals low O2 purity, but within specification for the user. Repairs are required. b. Pressure transducer tubing leaks.

10a.Check pressure at product tank. Pressure should rise to 21 p.s.i. at shift point. If not, replace P.C. Board (PROCEDURE 11). 10b.Inspect tubing at transducer and at product tank. Replace tubing ONLY if damage is evident. (PROCEDURE 9).

NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES

16

TROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE SYMPTOM: LOW CONCENTRATION, Continued:

PROBABLE CAUSE: 11.Flowmeter. a. Flowmeter opened beyond maximum flow rate. b. Cracked or broken Fitting. c. Input tubing leaking or loose. 12.Timing.

b.Restrictor Blockage.

UNIT EXCESSIVELY LOUD:

11a.Return flow to maximum setting. 11b.Replace fitting. 11c. Repair or replace. 12. To accommodate for varying tolerances when replacing components, an adjustable timer is used to control the shifting of the Invacare 5 Pressure Equalization (P.E.) Valve (PROCEDURE 18).

13. P.E. Valve. a.Bad Coil.

FLUCTUATING FLOW:

SOLUTION:

13a.Replace P.E. Valve (PROCEDURE 3). 13b. Replace P.E. Valve (PROCEDURE 3).

14. Inspect P.C. Board Restrictor tubing for kinks or tears.

14. Replace P.C. Board. Unit may need retiming after board replacement (PROCEDURE 11).

1. Regulator/Flowmeter. a. Incorrectly set regulator.

1a.Check pressure at oxygen outlet. If pressure is NOT within Specifi cation, adjust Regulator (PROCEDURE 6).

b. Flowmeter malfunction.

1b.If flow is still unstable, check for leaks starting at the compressor outlet fitting through all pneumatic connections. If no leaks are found and flow is still fluctuating, replace the regulator (PROCEDURE 6). If pressure at test point is within spec (5 p.s.i. + 0.5 max. [34.4 kPa +3.4]), replace flowmeter (PROCEDURE 14).

1. Pneumatic Exhaust. a. Muffler cracked, damaged or missing. b. Muffler tubing disconnected or damaged.

1a.Replace. (PROCEDURE 2). 1b.Reconnect or replace tubing.

2. Intake Resonator. a. Damaged or missing. b. Tubing disconnected or damaged.

2a.Install new resonator. 2b.Reconnect tubing or replace.

3. Inlet Filter missing.

3. Replace inlet filter.

4. Compressor.

4. Replace Compressor. Internal damage (PROCEDURE 7).

NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES

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T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE T R O U B L E S H O O T I N G

TROUBLESHOOTING GUIDE SYMPTOM: UNIT OVERHEATS:

PROBABLE CAUSE:

SOLUTION:

1. Base Exhaust Vent Plugged or restricted.

1. Place unit at least 3-inches from any wall. DO NOT place unit on pile or shag carpeting that may restrict air flow.

2. Cabinet Filters Dirty or blocked.

2. Clean or replace (PROCEDURE 2).

3. Fan. a. Leads to fan disconnected. b. Defective Fan. c. Fan installed upside down. 4. Compressor. a. Defective. b. Faulty capacitor. c. Bad motor windings. d. Worn seals. e. Bad bearings.

SENSO2 UNITS ONLY:

3a.Reconnect leads. 3b.Replace fan (PROCEDURE 10). 3c.Install fan with air flow arrow pointing down (PROCEDURE 10). 4a.Replace compressor (PROCEDURE 7). 4b.Replace capacitor (PROCEDURE 7). 4c.Replace compressor (PROCEDURE 7). 4d.Replace compressor (PROCEDURE 7). 4e.Replace compressor (PROCEDURE 7).

5. Line Voltage excessive (surge).

5. Have line voltage inspected by certified electrician. A voltage regulator may be required and is obtainable from your local electric company.

1. P.C. Board defective.

1. Replace P.C. Board (PROCEDURE 11). Unit may need retiming after P.B. Board replacement (PROCEDURE 18).

OXYGEN PURITY: GOOD Internal Status Indicators: RED: Off GREEN: Off Control Panel Indicators: RED: Off YELLOW: Off GREEN: Off

NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER REPLACEMENT OR ADJUSTMENT PROCEDURES

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