Low Flow / High Flow R203Pxx Service Manual Rev B

CONTENTS SECTION 1: SAFETY INFORMATION - WARNINGS AND CAUTIONS ... 1 EXPLANATION OF ABBREVIATIONS ... 2 LOW Flow Blender Diagrams (R203P13 Model) ... 2 HIGH Flow Blender Diagrams (R203P14 Model) ... 2 COMPONENT DESCRIPTIONS in Blender Diagrams... 3 MANIFOLD ASSEMBLY SERVICE ... 3 SECTION 2: TECHNICAL DESCRIPTION... 4 AIR / OXYGEN FLOW PATH INDICATION DIAGRAM ... 5 SECTION 3: MAINTENANCE PROCEDURES, REPAIR AND CALIBRATION ... 6 I. LOW FLOW (R203P13 Model) ... 6 Step 1: DISASSEMBLY ... 6 Step 2: CLEANING ... 9 Step 3: LOW FLOW ASSEMBLY ... 9 Step 4: TEST ... 12 Typical Test Configuration Diagram ... 12 LOW Flow Operation Verification Procedure ... 15 II. HIGH FLOW (R203P14 Model) ... 16 Step 1: DISASSEMBLY ... 16 Step 2: CLEANING ... 19 Step 3: HIGH FLOW ASSEMBLY ... 19 Step 4: TEST ... 22 Typical Test Configuration Diagram ... 22 High Flow Operation Verification Procedure ... 25 III. INTERNATIONAL LOW / HIGH Flow Operation Verification Procedure ... 26 SECTION 4: TROUBLESHOOTING ... 27 SECTION 5: ... 29 LOW FLOW Service Kit Diagram R203P15... 29 HIGH FLOW Service Kit Diagram R203P16 ... 30

R203M15 Rev. B

SECTION 1: SAFETY INFORMATION - WARNINGS AND CAUTIONS

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

WARNING Disconnect the Air-Oxygen Blender from all connections prior to disassembly. Use Medical Air and Medical Oxygen when servicing to avoid contamination. The Air-Oxygen Blender should be serviced by a qualified service technician. An Oxygen Analyzer/Monitor must be used to verify oxygen concentrations. When reassembling the Blender, do not pressurize the system until the retaining screw of the Proportioning Module has been fully tightened. The Proportioning Module can be forcefully ejected by gas pressure if not sufficiently tightened. Always follow ANSI and CGA standards for Medical Gas Products, Flowmeters and Oxygen Handling. When servicing requirements of Directive 93/42/EEC concerning medical devices and all International Standards apply. (On CE marked devices ONLY) DO NOT obstruct the alarm. Oxygen Concentration Dial does not rotate 360 degrees. Rotating the dial less than 21% or over 100% oxygen will damage the Blender.

Service Warning This Service Manual is provided for your safety and to prevent damage to the Air-Oxygen Blender. It is essential to read and understand this entire manual before attempting to service the Air-Oxygen Blender. If you have any questions regarding the installation, setup, operation, and/or maintenance of the AirOxygen Blender, contact Maxtec.

CAUTION Use recommended lubricants sparingly as lubricant may migrate to other areas and cause the Blender to malfunction. When pressurizing the Blender inlets, avoid pressure surges greater than 100 psi (6.9 bar) . Ensure all connections are tight and leak free before returning to service. Store Blender in a clean, dry area when not in use. DO NOT steam autoclave. DO NOT gas sterilize with (ETO) Ethylene Oxide. DO NOT immerse Air-Oxygen Blender into any liquid. DO NOT use if dirt or contaminants are present on or around the Blender or connecting devices. DO NOT clean with aromatic hydrocarbons.

Air / Oxygen Blender Service Manual

Page 1

EXPLANATION OF ABBREVIATIONS FIO2

Fractional Concentration of Inspired Oxygen

DISS

Diameter Indexed Safety System

NIST

Non-Interchangeable Screw Thread

lpm

Liters Per Minute

psi

Pounds Per Square Inch

Nm

Newton meter

LOW Flow Blender Diagrams (R203P13 Model)

HIGH Flow Blender Diagrams (R203P14 Model)

Air / Oxygen Blender Service Manual

Page 2

ITEM

COMPONENT DESCRIPTIONS in Blender Diagrams

A

Primary Outlet Port A male DISS oxygen fitting with check valve that delivers flow when engaged to any controlling device, such as a flowmeter. Oxygen Inlet Fitting A female DISS or NIST oxygen fitting with one way valve that is used to connect an oxygen supply hose. Air Inlet Fitting A male DISS or NIST air fitting with one way valve that is used to connect an air supply hose. Oxygen Concentration Dial A dial used for selecting oxygen concentrations between 21%-100%. The FIO2 scale is used for reference only. This Dial does not rotate 360°. The dial starts at 21% and ends at 100%. Rear Slide Mount with dove tail. Auxiliary Bleed Collar The collar is used to engage and disengage the bleed. The bleed is necessary to maintain accurate FIO2 Concentration below 15 lpm for the High Flow and 3 lpm for the Low Flow. To activate the bleed, slide and rotate (if applicable) the knurled collar back until it contacts the cover. To deactivate the bleed, pull and rotate (if applicable) collar away from cover until it reaches a positive stop. Auxiliary Outlet Port A male DISS oxygen fitting with check valve that delivers flow when engaged to any controlling device, such as a flowmeter. This outlet is equipped with a bleed valve that allows the user to control if the bleed is ON or OFF. With the bleed in the ON position, this outlet delivers accurate oxygen concentrations in the following flows: Model Flow Range High Flow 2 – 100 lpm Low Flow 0 – 30 lpm Alarm An audible alarm that sounds due to an excessive pressure drop or deletion of either gas supply.

B C D E F

G

H

Manifold Outlet with (3) primary outlets. (Optional) The Manifold Repair Kit is not contained in the Blender Service Kit .

MANIFOLD ASSEMBLY SERVICE Disassembly 1. 2. 3.

Remove Manifold Outlet Assembly from the bottom of the Blender using a 5/32 Hex Key. Unscrew (3) Primary Outlets from Manifold Block and discard. Remove the Manifold Body Outlet from the bottom of the Manifold Block. a. Remove and discard the (3) O-rings. b. Remove and discard the plastic washer from the top of the Manifold Block.

Assembly 1. 2. 3. 4. 5. 6.

Install (3) new Primary Outlets on the Manifold Block. (Use small amount of Blue Loctite on threads). Place (3) O-rings on the Manifold Body Outlet. Lubricate the hole on the Manifold Block with Krytox GPL106. Insert Manifold Body Outlet through the opening of the Manifold Block. Place plastic washer on top of the Manifold Body Outlet. Reinstall Manifold Assembly when installing air and oxygen inlets on the Blender using a 5/32 Hex Key.

Air / Oxygen Blender Service Manual

Page 3

SECTION 2: TECHNICAL DESCRIPTION The Air-0xygen Blender is a medical device used to mix Medical Air and USP Oxygen into a gas source ranging from 21% - 100% oxygen. The inlet gas connections are standard DISS or NIST for each gas. The inlets are clearly marked and labeled on the bottom of the Blender. The outlets are standard DISS male oxygen connections. The front panel of the Blender is designed has a dial that is used to set the specific FIO2 blend. The dial settings range from 21% oxygen to 100% oxygen.

The Path of the Gases

The supply enters through the air and oxygen inlet connectors located on the bottom of the Blender. Each inlet connector contains a particulate filter and duckbill check valves which prevent possible reverse gas flow.

Diaphragm Housing Module

The two gases then enter the two-stage pressure Diaphragm Housing Module. In this module, the pressures of both gas sources are equalized prior to entering the Proportioning Module. The pressure is equalized at the lower pressure. The diaphragm within the module responds to the difference in pressure and directs the movement of each check valve assembly contained within the air and oxygen chambers. The movement of each ball adjusts the amount of gas flowing through the Diaphragm Housing Module, equalizing the air and oxygen pressures to the lower pressure.

Proportioning Module

From the Diaphragm Housing Module the gases flow into the Proportioning Module and are mixed according to the oxygen percentage selected on the Oxygen Concentration Dial. The Proportioning Module consists of a double ended valve positioned between two valve seats. One seat controls the passage of air and the other valve seat controls the passage of oxygen into the outlet. At this point, the two gases have been blended according to the oxygen percentage selected on the Oxygen Concentration Dial. With the Oxygen Concentration Dial at the full counterclockwise position (21%), the double ended valve will completely close off the flow of oxygen, allowing only the air to flow. By adjusting the Oxygen Concentration Dial to the full clockwise position (100%), the flow of air is blocked, permitting only the flow of oxygen through the Blender outlet.

Alarm and Alarm Bypass

An audible alarm located on the bottom of the Blender that signals when the difference in pressure between the two inlet gasses exceeds 20 psi. When the two source gases are near equal in pressure, the alarm bypass poppet is positioned over the bypass channel, blocking the flow of both gases. The poppet will remain seated for unequal pressures up to 20 psi (1.41 kg/cm2). Once a 20 psi (1.41 kg/cm2) difference is sensed by the poppet, the higher gas pressure will overcome the spring force and pressure will overcome the spring force and pressure at its opposite end, thus creating a path for gas (air or oxygen) to flow into the alarm channel. The gas with the higher pressure will also flow directly to the Blender outlet port by passing the Balance and Proportioning Modules. The gas is also directed to the bottom of the unit to the reed alarm, thus creating and audible warning. The oxygen concentration will be that of the gas at the higher pressure. The Blender in the alarm/bypass mode will deliver the oxygen (100%) or air (21%) until the bypass mechanism resets when the source gas pressure is restored to a differential of approximately 6 psi (0.42 kg/cm2). If the Blender is set at 21% and the OXYGEN source pressure is reduced sufficiently to produce a 20 psi (1.41 kg/cm2) or greater differential, the unit will not alarm because it will continue to deliver 21% concentration according to the setting. If the control is moved slightly from the 21% setting, the alarm will sound. Similarly, if the Blender is set to deliver 100% oxygen concentration and AIR source pressure is reduced or lost, the unit will not alarm because it will continue to deliver the selected 100% concentration. The alarm will not function when there is no flow to the Blender. Air / Oxygen Blender Service Manual

Page 4

Gas Outlets

The Primary and Auxiliary Outlets are DISS male adapters with check valves.

AIR / OXYGEN FLOW PATH INDICATION DIAGRAM

Air / Oxygen Blender Service Manual

Page 5

SECTION 3: MAINTENANCE PROCEDURES, REPAIR AND CALIBRATION I. LOW FLOW (R203P13 Model) Step 1: DISASSEMBLY

Tools Required

#2 Phillips Screwdriver #3 Phillips Screwdriver 1/2 in. Open End Wrench

11/32 in. Nut Driver 5/32 in. Long Hex Key Small Retaining Ring Pliers

NOTE: Photos shown of Diaphragm Blocks are Engineered Composite Blocks. Figure A

1. Rotate dial [1] to the 60 graduation. 2. Remove the two flat head screws [2] on each side of the top cover [3]. 3. Remove top cover by pulling upwards. The cover will not come off unless the dial is at the 60 graduation

Figure B

4. Use a ½ in. open end wrench to unscrew and remove the air [4] and oxygen [5] inlet assemblies from bottom of the Blender. Oxygen inlet has left hand threads. 5. If manifold outlet assembly is present, unscrew the stem using a 5/32 hex key and holding the manifold outlet assembly to the bottom of the Blender. 6. Remove the four flat head screws [2] from bottom cover [6]. 7. Remove bottom cover.

Air / Oxygen Blender Service Manual

Page 6

LOW FLOW Figure C

8. Remove dial [1] by pulling dial away from manifold block [8]. 9. Remove the primary [9] and auxiliary [10] outlets (auxiliary contains Blue Muffler [38]) by using a ½ in. open end wrench to unscrew. 10. Use Retaining Ring Pliers to unscrew and remove audio alarm assembly [11] from the bottom of the manifold block.

Figure D

11. Use small retaining ring pliers to remove retaining rings [12] from each side of the alarm assembly [13]. Push the alarm assembly through to remove the assembly from manifold block.

Figure E

12. Using a 11/32 in. nut driver or socket, loosen the nut [14] (ONLY two turns) holding the knob guide [15] on the proportioning valve assembly [16]. Slide knob guide assembly from proportioning valve assembly shaft. Slide resistance ring [17] from proportioning valve assembly. 13. Remove phillips head screw [18] and washer [19] from side of proportioning valve assembly. 14. Replace knob guide assembly and tighten the nut. 15. Pull knob guide assembly to remove proportioning valve assembly from manifold block. Again, loosen the nut (ONLY two turns) holding the knob guide to the proportioning valve assembly, remove knob guide from proportioning valve assembly shaft.

Air / Oxygen Blender Service Manual

Page 7

LOW FLOW Figure F

16. Remove each diaphragm housing assembly [20] from the manifold by removing the two hex socket head screws [21] on the top of each diaphragm housing with 5/32 hex key. NOTE: If you have received engineered composite blocks, keep the four (4) Hex Socket head screws [21] and discard the aluminum blocks you have removed.

Figure G

17. Using 5/32 in. long hex wrench, unscrew and remove plug [22] from the bottom of the manifold block. 18. Remove rear plug [22] from the back of the manifold block. Insert a long 5/32 hex key through rear plug opening, unscrew and remove the alarm bypass body [23], ball [24] and spring [25].

NOTE: For Engineered Composite Diaphragm Blocks disregard Figure “H” and proceed to Figure “I” in the Blender maintenance process. Diaphragm blocks shall be installed in pairs and aluminum blocks shall not be mixed with engineered composite blocks.

Figure H

19. Remove and discard the two O-rings [26] from the bottom of each of the diaphragm housings [27]. 20. Remove the four hex socket head screws [28] holding diaphragm housings together. 21. Remove and discard the diaphragm [29]. 22. Using Retaining Ring Pliers, remove and discard check valves [30]. Ensure inner O-ring [36] is removed from diaphragm housing. NOTE: If check valve [30] comes apart when removing it from diaphragm housing, a ¼ in. hex wrench or (#3 Phillips Screwdriver) will be needed to complete removal of the check valve from the diaphragm housing. 23. Repeat steps 19-22 for the remaining diaphragm housing assembly. 24. Make sure all O-rings have been removed from diaphragm housings and check valves. 25. Disassembly is complete. 26. Manifold block and diaphragm housing may be ultrasonically cleaned.

Air / Oxygen Blender Service Manual

Page 8

Step 2: CLEANING

Maxtec recommends using an ultrasonic cleaner for cleaning all non-elastomeric and non-metallic components. However, cleaning with an all-purpose liquid cleaner and rinsing with clean, warm water may be substituted. Both methods require thoroughly blow drying all passages before reassembly. Follow the ultrasonic cleaner manufacturer instruction. Step 3: LOW FLOW ASSEMBLY

Tools Required

Lint Free Swab (optional) Pointed instrument for removing O-rings Krytox GPL 106 or equivalent Oxygen safe lubricant #2 Phillips Screwdriver 1/2 in. Open End Torque Wrench (Torque wrench(s) capable of 60 in-lbs and 10 ft-lbs) 11/32 in. Nut Driver 5/32 in. Long Hex Key Small Retaining Ring Pliers

Tools Supplied with Kit Diaphragm Alignment Tool

NOTE: For use with Aluminum Diaphragm Blocks ONLY.

Figure I

1. Position manifold block so that the mounting bracket is facing up. The large holes opposite the mounting locations of the diaphragm housing assemblies are facing you. 2. Cover the alarm assembly thread location with thumb. Drop spring [25] then ball [24] into alarm bypass orifice. 3. Place alarm bypass body [23] onto long shaft of 5/32 hex key. Guide the alarm bypass body, threads first into the alarm bypass orifice, and screw into cavity. Tighten until alarm bypass body is flush with bottom of center hole. Tighten enough to clear center threads ONLY. 4. Replace O-ring [32] on plug [22]. Insert plug and tighten.

Air / Oxygen Blender Service Manual

Page 9

LOW FLOW NOTE: See Figure J-1 for Aluminum Diaphragm Blocks and Figure J-2 for Engineered Composite Diaphragm Blocks. Diaphragm blocks shall be installed in pairs and Aluminum Blocks shall not be mixed with Engineered Composite Blocks.

Figure J-1 (Aluminum Diaphragm Blocks) (shown)

5. Assembling diaphragm housing assemblies. a. Ensure all O-rings have been removed from diaphragm housing. b. Place diaphragm alignment tool through center hole of one diaphragm housing. c. Place new diaphragm [29] on top of diaphragm housing, ensure center pin of diaphragm is in the center of diaphragm alignment tool. d. Place other diaphragm housing on top of the one with the diaphragm. Ensure the inlet holes of the diaphragm housings are on the same side. e. Fasten the two diaphragm housings together using four hex socket head screws [28]. Torque screws to 60 in-lbs. f. Place four new O-rings [26] on the inlet holes of the diaphragm housings. g. Remove diaphragm alignment tool. h. Place new O-rings [36] onto each check valve [30]. i. By hand, carefully insert new check valve [30] into diaphragm housing. (Check valves are double threaded) Thread check valves into diaphragm housing using Retaining Ring Pliers. Check valve must be flush with surface of diaphragm housing. DO NOT USE power tool to tighten. Repeat this step for the second check valve. j. Using two long hex socket head screws [21] secure each diaphragm housing assembly to the manifold block. Torque to 60 in-lbs (6.8 Nm). k. Repeat steps a - i for remaining diaphragm housing assembly.

Figure J-2 (Engineered Composite Diaphragm Blocks)

5. Installing diaphragm housing to manifold. a. Using two long hex socket head screws [21] secure each diaphragm housing assembly to the manifold block. Torque to 30 in-lbs (3.4 Nm).

Figure K

6. Lubricate alarm bypass assembly bore on manifold block with Krytox GPL 106. 7. Using retaining ring pliers install retaining ring [12] in one side of alarm assembly bore. 8. Insert alarm assembly [13] into bore of manifold block. 9. Install remaining retaining ring. 10. For Models without manifold block assembly: Replace O-ring [32] on plug [22] then install plug [22] into bottom hole of manifold block. 11. Thread auxiliary outlet assembly [10] to manifold block, torque to 10 ft-lbs (13.6 Nm).

Air / Oxygen Blender Service Manual

Page 10

LOW FLOW Figure L

12. Thread new primary outlet assembly [37] to Manifold Block torque to 10 ft-lbs (13.6 Nm).

Figure M

13. Start threads of new alarm assembly [11] by hand, tighten with Retaining Ring Pliers, ensure not to bend reed. 14. Attach bottom cover [6] using four flat head screws [2]. 15. Install new oxygen inlet assembly [5] torque to 10 ft-lbs (13.6 Nm). Oxygen inlet assembly has left handed threads. 16. Install new air inlet assembly [4], torque to 10 ftlbs (13.6 Nm).

Figure N

17. Lubricate proportioning valve bore with Krytox GPL 106. 18. Align the (3) holes on the proportioning valve assembly [16] equal distance between the (2) plugs and push in. *Reference drawing below. 19. Replace washer [19] and phillips head screw [18]. 20. Place new resistance ring [17] in its place on the proportioning valve assembly. *Proportional valve assembly inserted, with the “L” stamped on back for Low Flow Model.

Air / Oxygen Blender Service Manual

Page 11

Step 4: TEST

Equipment Required

Tools Required

Medical Air Supply Medical Oxygen Supply Calibrated Oxygen Analyzer/Monitor Calibrated Air or Oxygen flow monitor 0 to 70 lpm or greater Flowmeter 0 to 70 lpm or greater Calibrated Pressure Gauges 0 to 100 psi Regulators Tubing / Hoses

Phillips Screwdriver Torque Driver capable of 10 in-lbs Adjustable Wrench Retaining Ring Pliers Nut Driver

Typical Test Configuration Diagram

Instructions for Testing A.

Air and Oxygen Supply Setup

Both gas supplies must be clean and dry per the specifications outlined in this manual and have the ability to generate up to 100 psi (6.89 bar) for both the air and oxygen inlet pressures. Verify air and oxygen supply concentrations with a analyzer/monitor.

Air / Oxygen Blender Service Manual

Page 12

B.

C.

Blender Setup

1. Mount the Blender into a secured mating wall or pole bracket in an upright position. 2. Secure the air and oxygen hoses to the corresponding Blender inlets. 3. It is recommended that a condensation trap be installed in the air supply line just before the Blender air inlet. 4. Attach a flowmeter capable of 0-70 lpm to the auxiliary outlet on the Blender. 5. Attach a t-fitting to the outlet of the flowmeter. 6. Attach an Oxygen Analyzer/Monitor to the one outlet on the t-fitting. 7. Attach a calibrated Air or Oxygen Flow Monitor capable of 0-70 lpm or greater to the other outlet on the t-fitting. 8. The system is now ready for an initial performance test.

Initial Performance Test

NOTE: Before pressurizing make sure proportioning valve assembly is secure and screw is tightened.

1. Perform calibration on Oxygen Analyzer/Monitor per the manufacturer’s instructions prior to testing the Blender. 2. Set Air & Oxygen pressures to 50 psi (3.45 bar) each. NOTE: Turn OFF and check for leak by watching for pressure drops on pressure gauges. 3. An initial pressure drop may occur, no further drop in pressure should occur. 4. If continued pressure drop is observed, troubleshoot by using a commercial leak detector to find source of leak and refer to Section 4: TROUBLESHOOTING for further instructions. 5. Use a lint free dry cloth to wipe Blender clean of commercial leak detector. 6. Ensure both inlet pressures are at 50 psi. 7. Replace the top cover. NOTE: DO NOT install the (4) mounting screws until the end of the Final Test, or after satisfactory completion of the Performance Check. Refer to the “OPERATING INSTRUCTIONS” in Users Manual. 8. Set flowmeter to 3-3.5 lpm. 9. Set the Blender to 60% FIO2 with Oxygen Analyzer/Monitor, this value should remain within 3.0% of original reading throughout the following test. a. Set flowmeter to 30-30.5 lpm, check concentration reading. b. Set flowmeter back to 3-3.5 lpm. c. Set air inlet pressure to 50 psi (3.45 bar) and the oxygen inlet pressure to 43 psi (2.96 bar) adjust flow to 3-3.5 lpm, check concentration reading. d. Set air inlet pressure to 43 psi (2.96 bar) and the oxygen inlet pressure to 50 psi (3.45 bar) adjust flow to 3-3.5 lpm, check concentration reading. e. If the Oxygen Analyzer/Monitor setting does not remain within 3.0% of the original reading, then replace one or both of the diaphragm block assemblies.

NOTE: Diaphragm blocks shall be installed in pairs and Aluminum Blocks shall not be mixed with Engineered Composite Blocks.

Air / Oxygen Blender Service Manual

Page 13

D.

Reverse Gas Flow Procedure

E.

Setup of PROPORTIONING VALVE ASSEMBLY CALIBRATION

(Reference Operational Verification Procedure #’s 2 & 3 in Table, page 16 or 27.) 1. Disconnect the oxygen hose from the gas source. Remove all outlet connections from the Blender to ensure that there is no outlet flow. 2. Place the free end of the oxygen supply hose under water. Gradually increase the air supply pressure from 30 - 75 psi (2.07 - 5.17 bar), check for leakage past the oxygen inlet check valve. 3. Replace the Duckbill Check Valve in the oxygen inlet if bubbles indicate leakage. 4. Repeat steps 1-3 to check for leakage past the air inlet check valve. 5. Reconnect the air inlet hose and adjust both supply pressures back to standard inlet pressure. 1. Set air and oxygen inlet pressures to 50 psi. 2. Set flow to 9 lpm. 3. Turn Adjustment Shaft counterclockwise until the Oxygen Analyzer/Monitor displays a concentration equal to that of the source air (±0.3), reference Part A in Setup. 4. Attach knob guide assembly onto adjustment shaft of proportioning valve assembly so that the knob stop rests on top of the screw. Ensure knob stop aligns with the slot in the resistance ring. 5. While applying downward pressure to the 2 screws on the knob guide assembly, attach nut to adjustment shaft using nut driver. 6. Turn knob guide fully clockwise, Oxygen Analyzer/Monitor display should be equal to concentration of the source oxygen (±0.3). 7. Turn knob guide back to 21% position to ensure no drift from original reading (±0.3). 8. Re-attach knob guide, torque nut to adjustment shaft and tighten to 10 in-lbs using a torque driver. 9. Snap in knob back into knob guide, pay close attention to the key location of the knob. 10. Set knob to 60 graduation. 11. Replace the top cover. NOTE:

F.

DO NOT install the four (4) mounting screws until the end of the Final Test.

Final Test

Complete Operation Verification Procedure as per the test table, page 15 or 26. Record test results in the test table. When Final Test is complete replace top cover and install the four (4) mounting screws into cover. NOTE: Operation Verification Procedure should be performed at least once a year.

Air / Oxygen Blender Service Manual

Page 14

LOW Flow Operation Verification Procedure

USA and CANADA ONLY (50 psi / 3.45 bar MODELS)

SEQ#

1

DIAL SET O2%

ANY

OXYGEN PRESS ±1.0

AIR PRESS ±1.0

psi

bar

psi

bar

50

3.45

50

3.45

FLOWMETER SET TO lpm ±0.2

AUXILIARY BLEED

closed

closed

*2

60

75

5.17

0

0

0

closed

*3

60

0

0

75

5.17

0

closed

4

21

50

3.45

50

3.45

3

open

5

40

50

3.45

50

3.45

3

open

6

60

50

3.45

50

3.45

3

open

7

80

50

3.45

50

3.45

3

open

8

100

50

3.45

50

3.45

3

open

9

60

50

3.45

10

60

60

4.14

11

60

60

4.14

12

60

50

3.45

13

60

14

60

15

60

50 3.45 Slowly Slowly Reduce to Reduce to 30 2.07 Slowly Increase until alarm shuts off

16

60

50

3.45

17

60

50

3.45

18

60

19

60

50 67

4.62

50 3.45 Slowly Slowly reduce to reduce to 30 2.07 Slowly Increase until alarm shuts off

0 50

3.45

50

3.45

50

3.45

50

3.45 0

50 3.45

50

3.45 3.45

1

open

1

open

1

open

3

closed

3

closed

3

closed

3

closed

MAX

closed

MAX

closed

MAX

closed

MAX

open

FUNCTION

leak back flow back flow end point set point set point set point end point set point set point set point Alarm ON Alarm OFF Alarm ON Alarm OFF flow rate flow rate flow rate flow rate

TARGET VALUE

ACTUAL VALUE

<2 psi / 2 MIN <100 ml/min <100 ml/min (±0.3) Source Value 37.0%-43.0% 57.0%-63.0% 77.0%-83.0% (±0.3) Source Value 57.0%-63.0% 57.0%-63.0% 57.0%-63.0% 30.0 ± 2.0 psi 45.0 psi MAX 30.0 ± 2.0 psi 45.0 psi MAX 30.0 lpm MIN 30.0 lpm MIN 30.0 lpm MIN 30.0 lpm MIN

* Reference, Letter D. (Reverse Gas Flow Procedure)

Air / Oxygen Blender Service Manual

Page 15

II. HIGH FLOW (R203P14 Model) Step 1: DISASSEMBLY

Tools Required

#2 Phillips Screwdriver #3 Phillips Screwdriver 1/2 in. Open End Wrench

11/32 in. Nut Driver 5/32 in. Long Hex Key Small Retaining Ring Pliers

NOTE: Photos shown of Diaphragm Blocks are Engineered Composite Blocks. Figure A

1. Rotate dial [1] to the 60 graduation. 2. Remove the two flat head screws [2] on each side of the top cover [3]. 3. Remove top cover by pulling upwards. The cover will not come off unless the dial is at the 60 graduation

Figure B

4. Use a ½ in. open end wrench to unscrew and remove the air [4] and oxygen [5] inlet assemblies and primary [9] from bottom of the Blender. Oxygen inlet has left hand threads. 5. If manifold outlet assembly is present, unscrew the stem using a 5/32 hex key and holding the manifold outlet assembly to the bottom of the Blender. 6. Remove the four flat head screws [2] from bottom cover [6]. 7. Remove bottom cover.

Air / Oxygen Blender Service Manual

Page 16

HIGH FLOW Figure C

8. Remove dial [1] by pulling dial away from manifold block [8]. 9. Remove the primary [9] and auxiliary [10] outlets (auxiliary contains Blue Muffler [38]) by using a ½ in. open end wrench to unscrew. 10. Use Retaining Ring Pliers to unscrew and remove audio alarm assembly [11] from the bottom of the manifold block.

Figure D

11. Use small retaining ring pliers to remove retaining rings [12] from each side of the alarm assembly [13]. Push the alarm assembly through to remove the assembly from manifold block.

Figure E

12. Using a 11/32 in. nut driver or socket, loosen the nut [14] (ONLY two turns) holding the knob guide [15] on the proportioning valve assembly [16]. Slide knob guide assembly from proportioning valve assembly shaft. Slide resistance ring [17] from proportioning valve assembly. 13. Remove phillips head screw [18] and washer [19] from side of proportioning valve assembly. 14. Replace knob guide assembly and tighten the nut. 15. Pull knob guide assembly to remove proportioning valve assembly from manifold block. Again, loosen the nut (ONLY two turns) holding the knob guide to the proportioning valve assembly, remove knob guide from proportioning valve assembly shaft.

Air / Oxygen Blender Service Manual

Page 17

HIGH FLOW Figure F

16. Remove each diaphragm housing assembly [20] from the manifold by removing the two hex socket head screws [21] on the top of each diaphragm housing with 5/32 hex key. NOTE: If you have received engineered composite blocks, keep the four (4) Hex Socket head screws [21] and discard the aluminum blocks you have removed.

Figure G

17. Using 5/32 in. long hex wrench, unscrew and remove plug [22] from the bottom of the manifold block. 18. Remove rear plug [22] from the back of the manifold block. Insert a long 5/32 hex key through rear plug opening, unscrew and remove the alarm bypass body [23], ball [24] and spring [25].

NOTE: For Engineered Composite Diaphragm Blocks disregard Figure “H” and proceed to Figure “I” in the Blender maintenance process. Diaphragm blocks shall be installed in pairs and aluminum blocks shall not be mixed with engineered composite blocks.

Figure H

19. Remove and discard the two O-rings [26] from the bottom of each of the diaphragm housings [27]. 20. Remove the four hex socket head screws [28] holding diaphragm housings together. 21. Remove and discard the diaphragm [29]. 22. Using Retaining Ring Pliers, remove and discard check valves [30]. Ensure inner O-ring [36] is removed from diaphragm housing. NOTE: If check valve [30] comes apart when removing it from diaphragm housing, a ¼ in. hex wrench or (#3 Phillips Screwdriver) will be needed to complete removal of the check valve from the diaphragm housing. 23. Repeat steps 19-22 for the remaining diaphragm housing assembly. 24. Make sure all O-rings have been removed from diaphragm housings and check valves. 25. Disassembly is complete. 26. Manifold block and diaphragm housing may be ultrasonically cleaned.

Air / Oxygen Blender Service Manual

Page 18