Datex-Ohmeda Aestiva Reference Manual

Aestiva Anesthesia Machine

Technical Reference Manual

Aestiva

Datex-Ohmeda products have unit serial numbers with coded logic which indicates a
product group code, the year of manufacture, and a sequential unit number for
identification. The serial number can be in one of two formats.

AAAX11111 AA AXX111111A A

The X represents an alpha character
indicating the year the product was
manufactured; H = 2004, J = 2005, etc.
IIII and O are not used.

The XX represents a number indicating
the year the product was manufactured;

04

= 2004, 05 = 2005, etc.

Aestiva, SmartVent,

and

Link-25

are registered trademarks of Datex-Ohmeda Inc.

Other brand names or product names used in this manual are trademarks or registered
trademarks of their respective holders.

09/06 1006-0452-000

Technical Reference Manual

A

estiva Anesthesia Machine

This document is not to be reproduced in any manner, nor are the contents to be
disclosed to anyone, without the express authorization of the product service
department, Datex-Ohmeda, Ohmeda Drive, PO Box 7550, Madison, Wisconsin,

53707.

©

2006 Datex-Ohmeda Inc.

1006-0452-000 09/06

i

Aestiva

Important

The information contained in this Technical Reference manual pertains only to those
models of products which are marketed by Datex-Ohmeda as of the effective date of
this manual or the latest revision thereof. This Technical Reference manual was
prepared for exclusive use by Datex-Ohmeda service personnel in light of their training
and experience as well as the availability to them of parts, proper tools and test
equipment. Consequently, Datex-Ohmeda provides this Technical Reference manual to
its customers purely as a business convenience and for the customer's general
information only without warranty of the results with respect to any application of such
information. Furthermore, because of the wide variety of circumstances under which
maintenance and repair activities may be performed and the unique nature of each
individual's own experience, capacity, and qualifications, the fact that customer has
received such information from Datex-Ohmeda does not imply in anyway that Datex­Ohmeda deems said individual to be qualified to perform any such maintenance or
repair service. Moreover, it should not be assumed that every acceptable test and
safety procedure or method, precaution, tool, equipment or device is referred to within,
or that abnormal or unusual circumstances, may not warrant or suggest different or
additional procedures or requirements.

This manual is subject to periodic review, update and revision. Customers are
cautioned to obtain and consult the latest revision before undertaking any service of
the equipment. Comments and suggestions on this manual are invited from our
customers. Send your comments and suggestions to the Manager of Technical
Communications, Datex-Ohmeda, Ohmeda Drive, PO Box 7550, Madison, Wisconsin

53707.

wwww CAUTION

Servicing of this product in accordance with this
should never be undertaken in the absence of proper tools, test equipment and
the most recent revision to this service manual which is clearly and thoroughly
understood.

Technical Competence

The procedures described in this Technical Reference manual should be performed by
trained and authorized personnel only. Maintenance should only be undertaken by
competent individuals who have a general knowledge of and experience with devices of
this nature. No repairs should ever be undertaken or attempted by anyone not having
such qualifications.

Datex-Ohmeda strongly recommends using only genuine replacement parts,
manufactured or sold by Datex-Ohmeda for all repair parts replacements.

Technical Reference

manual

Read completely through each step in every procedure before starting the procedure;
any exceptions may result in a failure to properly and safely complete the attempted
procedure.

ii

09/06 1006-0452-000

Table of Contents

Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii

Technical Competence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii

1 Introduction

1.1 What this manual includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2 Standard service procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.1 Operation manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.2 Service manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.3 What is an Aestiva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.4 Configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

1.5 Symbols used in the manual or on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

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2 Theory of Operation

2.1 Theory overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2 Gas flow through the anesthesia machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.2 Physical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

2.2.3 Induction machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8

2.2.4 Wall-rail mount machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.2.5 System switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

2.2.6 Flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

2.3 Flow through the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2.3.1 Overview of flow paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2.3.2 Manual ventilation — Circle Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

2.3.3 Mechanical ventilation — Circle Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2.3.4 Fresh gas flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

2.3.5 Different breathing circuit modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

2.3.6 CO2 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

2.3.7 Auxiliary Common Gas Outlet (ACGO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

2.4 Electrical and pneumatic signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2.4.1 Summary of signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2.4.2 Subfloor tubing and wiring connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

2.4.3 Breathing circuit module ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

2.4.4 Control panel switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

2.4.5 Canister switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33

2.5 Ventilator monitoring and control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.1 Summary of ventilator function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.2 Volume Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.3 Pressure Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.4 PEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.5 O2 Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.6 Volume Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.7 Volume Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.8 Pressure Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

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Table of Contents

3 Checkout Procedure

3.1 Inspect the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.2 Electrical safety tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.3 Power failure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.4 Minimize alarms (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.5 Pipeline and cylinder tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

3.6 Flow control and pressure relief tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3.7 Vaporizer back pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

3.8 Flow sensor check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

3.9 Low-pressure leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

3.10 Alarm tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

3.11 Breathing system tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

3.12 Auxiliary O2 flowmeter tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

3.13 Integrated Suction Regulator tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

4 Repair Procedures

4.1 Servicing the ventilator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

4.2 How to bleed gas pressure from the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

4.3 How to remove the rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

4.4 How to remove the side panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

4.5 Service the pipeline inlet (pneumatic) manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.5.1 Remove pneumatic manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.5.2 Replace pipeline inlet fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

4.5.3 Replace pipeline inlet filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

4.5.4 Replace pipeline inlet check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4.5.5 Replace pneumatic O2 power outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

4.5.6 Rebuild flush regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

4.5.7 Replace high-pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

4.5.8 Change drive gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4.6 Service the cylinder supply modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

4.6.1 Tightening procedure for high-pressure tube fittings . . . . . . . . . . . . . . . . . . . . . . 4-16

4.6.2 Replace primary regulator module (complete replacement) . . . . . . . . . . . . . . . 4-16

4.6.3 Replace cylinder inlet filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

4.6.4 Replace cylinder check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

4.6.5 Replace 4th- and 5th-gas cylinder supply module . . . . . . . . . . . . . . . . . . . . . . . 4-18

4.7 Service pipeline and cylinder pressure gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

4.7.1 Remove gauge panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

4.7.2 Replace pipeline or cylinder pressure gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20

4.8 Replace system switch assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21

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Aestiva Anesthesia Machine

4.9 Service the flowmeter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

4.9.1 Remove front flowmeter panel shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24

4.9.2 Remove flowtubes for cleaning or replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

4.9.3 Remove complete flowmeter head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

4.9.4 Replace flowmeter modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

4.9.5 Replace flowmeter frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

4.9.6 Replace O2 supply switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

4.9.7 Checkout procedure for O2 supply switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

4.9.8 Replace secondary regulator manifold or balance regulator manifold . . . . . . . 4-35

4.9.9 Replace O2 or N2O needle valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36

4.9.10 Replace 3rd or 4th gas needle valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

4.10 Service vaporizer manifold parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39

4.10.1 Repair manifold port valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39

4.10.2 Checkout procedure for manifold port valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40

4.10.3 Replace vaporizer manifold check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41

4.10.4 Replace vaporizer pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43

4.10.5 Replace vaporizer manifold (complete replacement) . . . . . . . . . . . . . . . . . . . . 4-44

4.11 Service common gas manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45

4.11.1 Replace common gas manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45

4.11.2 Replace common gas manifold check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46

4.11.3 Replace O2 flush switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-47

4.12 Service the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

4.12.1 Replace control panel cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-48

4.12.2 Replace control panel microswitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-49

4.12.3 Replace Bag-to-Vent toggle or microswitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50

4.12.4 Replace adjustable pressure limiting (APL) knob assembly . . . . . . . . . . . . . . . 4-55

4.12.5 Replace APL disc or cage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-57

4.12.6 Replace airway pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-58

4.12.7 Remove or replace canister and dishes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59

4.12.8 Replace breathing system canister release handle and release mechanism . 4-59

4.12.9 Replace canister microswitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-60

4.12.10 Remove the front and rear subfloors and the bulkhead cover . . . . . . . . . . . . 4-61

4.12.11 Replace circuit module identification printed circuit board (ID PCB) . . . . . . 4-62

4.12.12 Replace common gas outlet (CGO) assembly . . . . . . . . . . . . . . . . . . . . . . . . . 4-63

4.12.13 Remove the bulkhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-63

4.12.14 Replace ACGO or ACGO microswitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

4.12.15 Disassemble ACGO to replace seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-65

4.12.16 Replace sensor interface board (SIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-67

4.13 CO2 Bypass repair procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69

4.13.1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-69

4.13.2 Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-70

4.13.3 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-70

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4.14 Service the breathing system with an articulating arm . . . . . . . . . . . . . . . . . . . . . . . . . 4-75

4.14.1 Removing the rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-75

4.14.2 Latch adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-75

4.14.3 Check/adjust tension of absorber arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-75

4.15 Remove or replace drawer slides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-76

4.15.1 Replace drawer lock assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-77

4.15.2 Remove or replace lower shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-78

4.15.3 Replace side panel for drawer enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-78

4.16 Replace O2 Flush components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-79

4.16.1 Replace O2 flush button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-79

4.16.2 Replace O2 flush valve block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-80

4.17 Replace auxiliary flowmeter or suction regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-81

4.18 Repair or replace display arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-82

4.19 Display mount adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84

4.19.1 Standard mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84

4.19.2 Heavy duty mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84

4.20 Replace Front Casters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-86

4.21 Replace Back Casters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-88

4.22 Replace flip-up shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-89

4.23 Replace light package bulbs or panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-90

5 Installation and Maintenance

5.1 Aestiva/5 Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

5.2 Aestiva/5 Planned Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

5.2.1 Every six (6) months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

5.2.2 Every twelve (12) months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

5.2.3 Every twenty-four (24) months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

5.3 Lubricate absorber canister locking mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

5.4 Dressing leaky seats in bellows pop-off and APL valve . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

5.5 Auxiliary O2 flowmeter tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

5.6 Integrated Suction Regulator tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11

5.7 Cleaning and inspecting the bag to ventilator toggle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

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6 Calibration

6.1 Primary Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

6.1.1 Test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

6.1.2 Testing Primary Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

6.1.3 Adjusting Primary Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

6.2 Secondary Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

6.2.1 Testing/Adjusting Secondary Regulators or Balance Regulators . . . . . . . . . . . . 6-16

6.3 Needle Valve Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

6.3.1 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

6.3.2 O2 Needle Valve Calibration (Minimum Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

6.3.3 N2O, CO2, and Heliox Needle Valve Calibration (Minimum Flow) . . . . . . . . . . . . 6-19

6.3.4 Air Needle Valve Calibration (Minimum Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

6.3.5 Needle Valve Calibration (Maximum Flow) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26

6.4 Link system calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27

6.5 O2 Flush Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

6.6 Zero the pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

6.6.1 Checking the pressure gauge accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35

6.7 O2 Supply Failure Alarm — Induction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36

7 Troubleshooting

7.1 General Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2

7.2 Breathing System Leak Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4

7.2.1 Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5

7.2.2 Breathing System Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

7.2.3 Breathing system leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

7.2.4 Leak Isolation Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

8 Illustrated Parts

8.1 Service tools — Anesthesia machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4

8.1.1 Secondary regulator pilot pressure tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5

8.2 Touch-up paint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-6

8.3 Casters, brake, and work surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-7

8.4 Rear panel — upper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8

8.5 Rear panel — lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9

8.6 Side panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10

8.7 Upper shroud parts (lighting and bezel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12

8.8 Compact/Induction Trolley label set and headframe parts . . . . . . . . . . . . . . . . . . . . . . . 8-13

8.9 Wall-rail mount label set and headframe parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14

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Table of Contents

8.10 Wall-rail mount wrapper components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-15

8.11 Induction machine pneumatic components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-16

8.12 Compact/Induction wall-rail mount components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17

8.13 Flush Button/Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18

8.14 AC inlets and Power cords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19

8.14.1 AC Inlet Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-20

8.15 Display folding mount —7900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-22

8.16 Display folding mount — 7100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23

8.17 Display Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24

8.17.1 Arm parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24

8.17.2 Shoulder parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26

8.17.3 Display mount parts (standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-28

8.17.4 Display mount parts (heavy duty) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-29

8.18 Cylinder Gas Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-30

8.18.1 Cylinder inlet fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-31

8.19 Main manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32

8.19.1 O2 flush regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32

8.20 Pipeline inlet manifolds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33

8.20.1 Pipeline inlet fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-34

8.21 Power outlets and Heliox pipeline inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-35

8.22 Common gas manifold — for units with O2 Flush regulator . . . . . . . . . . . . . . . . . . . . . . 8-36

8.23 Common gas manifold — for units without O2 Flush regulator . . . . . . . . . . . . . . . . . . . 8-37

8.24 Pressure gauges and gauge panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-38

8.24.1 Pressure gauge labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-39

8.25 Flowmeter components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-40

8.25.1 Flowtube parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-42

8.25.2 Secondary regulator components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44

8.26 Vaporizer manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46

8.27 Breathing System - service parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-48

8.27.1 Breathing System - user replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-50

8.27.2 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-56

8.27.3 Chassis Upper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-58

8.27.4 Bulkhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-60

8.27.5 Chassis Lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62

8.27.6 Absorber (CO2) bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-63

8.27.7 Bag Arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-64

8.27.8 Auxiliary common gas outlet (ACGO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65

8.28 Anesthetic Gas Scavenging System — AGSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-66

8.28.1 Passive AGSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-66

8.28.2 Active AGSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-68

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8.29 Articulating Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-70

8.29.1 Support Column and Arm Assembly: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-70

8.29.2 Articulating arm accessory items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-72

8.30 Lower Shelve Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-74

8.30.1 Parts List for Shelf Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-74

8.31 Drawer and Shelf Accessory Mounting Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-76

8.32 Drawer, Standard 11 cm Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77

8.33 Drawer, Optional 15 cm Non-locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-78

8.34 Flip up shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79

8.35 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-80

8.36 Legris quick-release fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-81

8.37 Tubing charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-82

8.37.1 Main manifold tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-82

8.37.2 Individual pipeline inlet manifold tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-84

8.37.3 2nd Cylinder (Air, N2O, O2) and CO2 or Heliox tubing . . . . . . . . . . . . . . . . . . . . 8-86

8.37.4 Copper tubing kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-87

8.37.5 Induction machine with pneumatic manifold . . . . . . . . . . . . . . . . . . . . . . . . . . 8-88

8.37.6 Induction machine with individual pipeline inlets . . . . . . . . . . . . . . . . . . . . . . . 8-90

8.37.7 Wall mount machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-92

8.37.8 Breathing System tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-94

8.38 Integrated Suction Regulator and Auxiliary O2 Flowmeter . . . . . . . . . . . . . . . . . . . . . . . 8-95

8.38.1 Major Components(vacuum suction) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-95

8.38.2 Suction Housing Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-96

8.38.3 Regulator Assembly (3 mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-97

8.38.4 Rear-Panel Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-98

8.38.5 Auxiliary O2 Flowmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-99

8.38.6 Venturi Suction Housing Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-100

8.38.7 Venturi Suction Regulator front view (2 mode) . . . . . . . . . . . . . . . . . . . . . . . . 8-101

8.38.8 Venturi Suction Regulator rear view (2 mode) . . . . . . . . . . . . . . . . . . . . . . . . . 8-102

8.39 Service parts for optional kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-103

8.39.1 Wall-rail cylinder mounting kit 1006-4657-000 . . . . . . . . . . . . . . . . . . . . . . . 8-103

8.39.2 ALM Pendant mounting kit 1006-8316-000 for wall-rail mount machines . 8-103

9 Schematics and Diagrams

x 09/06 1006-0452-000

1 Introduction

In this section

This section provides a general overview of the Aestiva Anesthesia Machine.

1.1 What this manual includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2 Standard service procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.1 Operation manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2.2 Service manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.3 What is an Aestiva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.4 Configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

1.5 Symbols used in the manual or on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

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1.1 What this manual includes

Anesthesia Machine

Ventilator

MRI Machine

This manual covers the service information for the Aestiva line of anesthesia
machines. It covers the following components:

• gas delivery components,

• breathing system components,

• frame component (except those strictly associated with a specific
ventilator).

The ventilators associated with the Aestiva machine have their own service
manuals:

• for the Aestiva 7900 SmartVent see service manual 1006-0453-000,

• for the Aestiva 7100 Ventilator see service manual 1006-0836-000.

The Aestiva MRI Anesthesia Machine includes special components that allow
it to operate in an MRI environment.

• for MRI related issues see the service manual supplement 1006-0858-000.

1.2 Standard service procedures

1.2.1 Operation manuals

You must have, and be familiar with, the operation manuals for this product.
Refer to the Aestiva operation manuals if you need further information about
the operation of the system.

1.2.2 Service manuals

You must determine where a problem is located before you can determine
which service manual to use:

• Use this manual for machine and breathing system related issues.

• Use the appropriate Ventilator service manual for ventilator related issues.

• Use the MRI service manual supplement for MRI component issues.

1-2 09/06 1006-0452-000

1.3 What is an Aestiva

1 Introduction

The Aestiva is a flexible anesthesia delivery machine. A wide selection of
frames, gases, and vaporizers give the user full control of the system
configuration.

Options include pendant mounted systems, extra gas cylinders or vaporizers,
and left-hand (LH) or right-hand (RH) breathing systems (TNA).

Components Number of

2-Vap Trolley

3-Vap Trolley

Pendant

MRI

Compact

Compact wall-rail mount

Induction

Induction wall-rail mount

Ventilators and monitors

Number of gases Optional gases

vaporizers

22 or 3 Air or Heliox; CO

3 2, 3, or 4 Air, Heliox, CO2

22 or 3 Air or Heliox; CO

22 or 3 Air or Heliox; CO

22 or 3 Air or CO

22 or 3

22 or 3 Air or CO

22 or 3

(

CO2 cylinder only

(up to two)

The machine can be configured with either of two microprocessor-controlled
ventilators (7900 SmartVent or Aestiva 7100 Ventilator) that include
monitoring of certain patient parameters.

Breathing

)

system and

ventilator display

mounting

Left or Right Up to 4

2

Left or Right Up to 5

Left or Right Up to 2

2

TNA Left;

2

7900 display

center

2

Air

2

Air

Left Up to 4

Left Up to 2

None

(LH machine)

None

(LH machine)

Total number of

cylinders

2 per gas

(

maximum

)

Up to 4

Up to 4

Up to 2

The ventilators include communication software that can output patient data
through a serial communications port.

Monitoring features can be further expanded with additional Datex-Ohmeda
monitors.

1006-0452-000 09/06 1-3

Aestiva Anesthesia Machine

1.4 Configuration options

Figures 1-1 and 1-2 show the front and rear views of the machine; Figure 1-3
shows breathing system components. There are some differences between
models:

• Breathing systems can be on the left or right side. The part locations are the

Note:

Newer machine variants
include individual pipeline inlet
manifolds in place of the single
pneumatic manifold used in
previous production machines. The
pipeline inlets are arranged in the
same order for both the ANSI and
ISO units.

• ANSI and ISO systems use the same pneumatic manifold rotated 180

• All models use the same relative cylinder positions with the O

• ANSI and ISO systems use the same flowhead assembly but the flowmeter

•Machines include active or passive gas scavenging.

• Options include an auxiliary common gas outlet (ACGO), different breathing

mirror image.

°

.
Viewed from the rear, ANSI units have the pneumatic outlet on the right and
ISO units have it on the left.

cylinder

2

farthest from the breathing system.

modules are in opposite order.

circuit modules (Circle and Bain/Mapleson D), a CO

(absorber) bypass, a

2

suction regulator and an auxiliary O2 flowmeter (in display arm), a folding
mount display bracket in place of the display arm.

1-4 09/06 1006-0452-000

1 Introduction

8

7

6

9

5

1. Brake

2. System switch

3. Pressure gauges (cylinder)

4. Pressure gauges (pipeline)

5. O

Flush

2

6. Flow controls

7. Light switch and connector

8. Ventilator display

9. Vaporizers

4

3

AA.96.054

2

1

Figure 1-1 • Aestiva with 7900 Ventilator (front view)

1006-0452-000 09/06 1-5

Aestiva Anesthesia Machine

8

7

6

1

2

3

4

5

AA.96.053

1. Circuit breaker(Total outlet current)

2. Circuit breaker (mains inlet)

3. Pneumatic power outlet(O

— DISS or ISO)

2

4. Pipeline inlets

5. Cylinder connections

6. Outlet circuit breaker

7. Electrical outlet

8. Overflow safety trap (optional suction regulator)

Figure 1-2 • Aestiva (rear view)

1-6 09/06 1006-0452-000

1 Introduction

8

9

7

10

6
5

4

11

3

2

AB.23.003

1

1. Canister release

2. Auxiliary common gas outlet — ACGO (optional)

3. ACGO switch

4. O

sensor

2

5. Flow sensor module

6. Circuit module

7. Bag arm

8. Bag/Vent switch

9. Bellows

10. Airway pressure gauge

11. APL valve

Figure 1-3 • Breathing system parts

1006-0452-000 09/06 1-7

Aestiva Anesthesia Machine

1.5 Symbols used in the manual or on the equipment

Symbols replace words on the equipment, on the display, or in Datex-Ohmeda
manuals. No one device or manual uses all of the symbols.

Warnings and Cautions tell you about dangerous conditions that can occur if
you do not follow all instructions in this manual:

•Warnings tell about a condition that can cause injury to the operator or the
patient.

• Cautions tell about a condition that can cause damage to the equipment.

Read and follow all warnings and cautions.

m

L

l

n
M

N

†

p

On (power)

Alarm silence

A

Off (power) Alarm silence

Standby

Standby or preparatory state for part of
the equipment

“ON” only for part of the equipment

“OFF” only for part of the equipment

Direct current

Alternating current

j

J

D

w

wW

O

Type B equipment

Type BF equipment

Type CF equipment

Caution, ISO 7000-0434

Attention, refer to product instructions,
IEC 60601-1

Dangerous voltage

x

y

P

Y

1-8 09/06 1006-0452-000

Protective earth ground

Electrical input

Earth ground

Electrical output

Frame or chassis ground

Pneumatic input

Equipotential

Pneumatic output

1 Introduction

+

-

t

T

o

g

z

Plus, positive polarity

k

Minus, negative polarity

E

Variability

Variability in steps Read to center of float

Lamp, lighting, illumination

This way up

Pipeline

Lock

Movement in one direction

Movement in two directions

Read top of float

Vacuum inlet

Suction bottle outlet

Cylinder

Isolation transformer

Z

U
u

Í

134°C

Unlock

Close drain

Drain (remove condensate)

Not autoclavable

Autoclavable

APL settings are approximate

r

R

O2+

Linkage system

Risk of Explosion.

Low pressure leak test

Mechanical ventilation

Bag position/ manual ventilation

O2 Flush button

1006-0452-000 09/06 1-9

Aestiva Anesthesia Machine

< 414 kPa

q

< 345 kPa

Inspiratory flow

Expiratory flow

Q

Inspiratory flow Expiratory flow

Pinch hazard Submenu

Circle breathing circuit module Bain/Mapleson D breathing circuit

module

The primary regulator is set to pressure
less than 345 kPa (50 psi)

Absorber on

The primary regulator is set to pressure
less than 414 kPa (60 psi)

CO2 Bypass Option

REF

SN

EZchange Canister (CO2 bypass)

Absorber off (CO2 Bypass active)

No battery/battery failure Battery in use. Bar indicates amount of

battery power remaining.

Stock Number

Serial Number Caution: federal law prohibits dispensing

Authorized represent ative in the European
Community

Manufacturer

MAX

Maximum

without prescription.

Systems with this mark agree with the
European Council Directive (93/42/EEC)
for Medical Devices when they are used
as specified in their User’s Reference
manuals. The xxxx is the certification
number of the Notified Body used by
Datex-Ohmeda’s Quality Systems.

1-10 09/06 1006-0452-000

2 Theory of Operation

In this section 2.1 Theory overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2 Gas flow through the anesthesia machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2.2 Physical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

2.2.3 Induction machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8

2.2.4 Wall-rail mount machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.2.5 System switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

2.2.6 Flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

2.3 Flow through the breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2.3.1 Overview of flow paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2.3.2 Manual ventilation — Circle Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

2.3.3 Mechanical ventilation — Circle Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2.3.4 Fresh gas flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

2.3.5 Different breathing circuit modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

2.3.6 CO

2.3.7 Auxiliary Common Gas Outlet (ACGO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

2.4 Electrical and pneumatic signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2.4.1 Summary of signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2.4.2 Subfloor tubing and wiring connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

2.4.3 Breathing circuit module ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

2.4.4 Control panel switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

2.4.5 Canister switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33

2.5 Ventilator monitoring and control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.1 Summary of ventilator function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.2 Volume Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.3 Pressure Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

2.5.4 PEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.5 O2 Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.6 Volume Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.7 Volume Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

2.5.8 Pressure Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36

Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

2

1006-0452-000 09/06 2-1

Aestiva Anesthesia Machine

2.1 Theory overview

This section describes:

• The flow of gas through the anesthesia machine.

• The flow of gas through the breathing system.

• Electrical signals between the anesthesia machine, including the breathing
system, and the ventilator.

Note Newer machine variants include individual pipeline inlet manifolds in place of

the single pneumatic manifold used in previous production machines.
Additionally, the common gas manifold has been redesigned (check valve
removed) and the second regulator (O
eliminated.

2.2 Gas flow through the anesthesia machine

Flush and Aux O2) has been

2

2.2.1 Overview Figure 2-4 shows the portion of the pneumatic circuit that is affected by the

individual pipeline inlet manifolds and the changes to the common gas
manifold.

Figure 2-5 shows the complete pneumatic circuit with the original pneumatic
manifold.

Gas supplies (items 1–6) Gas enters the system through a pipeline (2) or cylinder (4) connection. All

connections have indexed fittings, filters, and check valves (one-way valves).
Gauges show the cylinder (3) and pipeline (1) pressures.

A primary regulator (5) decreases the cylinder pressures to approximately
pipeline levels. A pressure relief valve (6) helps protect the system from high
pressures.

To help prevent problems with the gas supplies:

• Install yoke plugs on all empty cylinder connections.

•When a pipeline supply is connected, keep the cylinder valve closed.

O2 flow (items 7–14, 27) Pipeline or regulated cylinder pressure supplies O

outlet and to the ventilator supply connection (7a). A second regulator (13)
(not used in newer machine variants) decreases the pressure for the flush
valve (14a) and the auxiliary flowmeter (27).

directly to the pneumatic

2

The flush valve supplies high flows of O
the flush button. The flush pressure switch (14b) monitors activation of the
flush valve.

When the system switch (8) is On, O
is a minimum flow of 25 to 75 mL/min through the O

A secondary regulator (10) supplies a constant O

An electrical switch (9) monitors the O
low, an alarm appears on the ventilator display.

2-2 09/06 1006-0452-000

to the fresh gas outlet when you push

2

flows to the rest of the system and there

2

flowmeter (12).

2

pressure to the flowmeter.

2

supply pressure. If the pressure is too

2

2 Theory of Operation

AA.96.389

28

E

29

30 30 30 30

AAAA

A

30

B

C

31

31

D

3131

A. Cylinder Supplies
B. Pneumatic Manifold
C. Flowmeter Head
D. Vaporizer Manifold
E. Common Gas Manifold

A. Cylinder Supply
B. Pneumatic Manifold
C. Flowmeter Head
D Vaporizer Manifold
E. Common Gas Manifold

A

AAAA

28

29

E

A. Cylinder Supply
B. Pipeline Inlet Manifold
E. Common Gas Manifold

B

30

30 30 30 30

B

BB

AA.96.381

B

Figure 2-4 • Pneumatic circuit diagram (machines with individual pipeline inlet manifolds)

Air, N2O, and third gas flow

(items 7b, 8, and 15–23)

Pipeline or regulated cylinder pressure supplies Air (7777bbbb) directly to the
ventilator (Air Ventilators). When the system switch (8) is On, air flows to the
rest of the system. A secondary regulator (18) supplies the air flow control
valve. Because there is no balance regulator, air flow continues at the set rate
(19) during an O

Balance regulators (15, 21) control the N

supply failure.

2

O and the optional gas (CO2,

2

Heliox) pressure supply to the needle valve flow controls (16, 22). O

2

secondary regulator pressure at a pilot port controls the output of the balance
regulator. N
supply pressure and shut off hypoxic gas flow before the O

O, CO2, and Heliox output pressures drop with decreasing O2

2

supply pressure

2

reaches zero.

A chain link system (Link-25) on the N
keep the O

concentration higher than 21% (approximate value) at the

2

common gas outlet.

O and O2 flow controls (16, 11) helps

2

Mixed gas (items 24–26) The mixed gas goes from the flowmeter outlet, through the vaporizer manifold

and vaporizer (25) that is On, to the fresh gas outlet, and into the breathing
system. A pressure relief valve (26) limits the maximum outlet pressure.

Figure 2-5 • Pneumatic circuit diagram (machines with a pneumatic manifold)

1006-0452-000 09/06 2-3

Aestiva Anesthesia Machine

AA.96.389

28

E

29

30 30 30 30

AAAA

A

30

B

C

31

31

D

3131

A. Cylinder Supplies
B. Pneumatic Manifold
C. Flowmeter Head
D. Vaporizer Manifold
E. Common Gas Manifold

A. Cylinder Supply
B. Pneumatic Manifold
C. Flowmeter Head
D Vaporizer Manifold
E. Common Gas Manifold

A

AAAA

28

30

30 30 30 30

29

AA.96.381

E

BB

B

C

3131

31

31

A. Cylinder Supply
B. Pipeline Inlet Manifold
C. Flowmeter Head
D Vaporizer Manifold
E. Common Gas Manifold

Figure 2-6 • Pneumatic circuit diagram (machines with individual pipeline inlet manifolds)

D

Figure 2-7 • Pneumatic circuit diagram (machines with a pneumatic manifold)

2-4 09/06 1006-0452-000

Key to Numbered Components 1. Pipeline pressure gauge

2. Pipeline inlet

3. Cylinder pressure gauge

4. Cylinder inlet

5. Primary regulator (cylinder pressure)

6. High-pressure relief valve

• For machines with pneumatic manifold (883 kPa / 128 psi)*

• For machines with pipeline inlet manifolds (758 kPa / 110 psi)*

7. Supply connections for the ventilator

a. O

drive gas

2

b. Air drive gas

8. System switch

9. Switch for low O

10.O

secondary regulator (207 kPa / 30 psi)*

2

11.O

flow control valve

2

12.O

flow tubes

2

13.O

flush and auxiliary flowmeter regulator (131 kPa / 19 psi)*

2

14.O

Flush

2

a. Flush valve

b. Pressure switch (used with the ventilator)

15.N

O balance regulator

2

16.N

O flow control valve

2

17.N

O flow tubes

2

18.Air secondary regulator (207 kPa / 30 psi)*

19.Air flow control valve

20.Air flow tube

21.Optional gas balance regulator

22.Optional gas flow control valve

23.Optional gas flow tube

24.Vaporizer port valve

25.Vaporizer

26.Low-pressure relief valve (38 kPa / 5.5 psi)*

27.Auxiliary flowmeter (optional)

28.Common gas outlet (CGO)

29.Pneumatic outlet (O

30.Test port (primary regulator)

31.Test port (secondary/balance regulator)

* Approximate values

supply pressure alarm (used with the ventilator)

2

)

2

2 Theory of Operation

Key to Symbols

Pneumatic Connection

Filter

Direction of Flow

Check Valve

1006-0452-000 09/06 2-5

Aestiva Anesthesia Machine

2.2.2 Physical connections

Figure 2-5 shows the physical path that the gas takes in machines with a
pneumatic manifold. To show all connections, the gas manifold (B) and the
flowhead (C) have the front and the back views next to each other. For tubing
connections in machines with individual pipeline inlet manifolds, refer to
Section 8.37.2.

Figure 2-6 shows some of the actual parts.

24

D

26

18

Air

8

31 31

15 10 9

OO

N

2

2

31

12 17 20

O

N2O Air

2

C

AA.96.278

6a

13

2

O

2

B

22

O

N

2

6b

111

27

29

Air

29

6c

7b

Air

O

N

2

O

2

B

7a

33 3

5

4 4 4

O

2

55

N2O

Air

303030

O2+

14a

E

14b

To
Breathing
System

Figure 2-5 • Typical tubing connections - pictorial

2-6 09/06 1006-0452-000

2 Theory of Operation

Pneumatic

Manifold

B

6a

13

6b

A

1 Pipeline pressure gauge
2 Pipeline inlet
3 Cylinder pressure gauge
4 Cylinder inlet
5 Primary regulators (cylinder pressure)
6a O
6b N
6c Air high-pressure relief valve
7a* Vent drive gas (O
7b* Vent drive gas (Air)

high-pressure relief valve

2

O high-pressure relief valve

2

)

2

8 System switch
9 Switch, low O
10 O
11 O2 flow control valve
12 O
13 Flush regulator
14a* O
14b* O
15 N
16 N
17* N
18 Air secondary regulator

secondary regulator

2

flowtubes

2

Flush valve

2

Flush pressure switch (Vent feedback)

2

O balance regulator

2

O flow control valve

2

O flowtubes

2

supply pressure alarm

2

19 Air flow control valve
20* Air flowtube
21** Optional gas balance regulator
22** Optional gas flow control valve
23** Optional gas flowtubes
24 Vaporizer port valve
25** Vaporizers
26 Low-pressure relief valve
27 To auxiliary O
28** Common gas outlet (CGO)
29 Pneumatic outlet (O
30 Test ports (primary regulator)

Flowmeter

2

2

)

31 Test ports (secondary/balance regulators)
A Cylinder supplies
B Pneumatic manifold
C Flowhead
D Vaporizer manifold
E Common gas manifold
F Chain link hypoxic guard (LINK-25)
G Individual pipeline inlet manifolds
* Not shown pictorially
** Not shown

11

5

F

Rear

Individual

Pipeline

Inlets

Front

16

6c

29

E

2

30

4

2

G

6a 6b 6c

24

D

9

10

15 18

C

31

19

1

8

Figure 2-6 • Typical components

1006-0452-000 09/06 2-7

Aestiva Anesthesia Machine

2.2.3 Induction machine The Induction machine does not include a breathing system or a ventilator.

Mixed gas and O
directly to the Common Gas Outlet (CGO) at the front of the machine.

Flush output from the common gas manifold (E) flow

2

A pneumatic alarm assembly (9) taps into the O
manifold (B) and sounds the O

Supply Failure alarm when O2 pressure falls

2

supply at the pneumatic

2

below the threshold.

The alarm assembly consists of three parts: a canister (G) that hold a volume
of pressurized O

, a pressure regulator (H), and a whistle (I) that sounds the

2

alarm. The regulator keeps the canister pressurized as long as the supply
pressure is higher than the alarm limit. When supply pressure falls below the
alarm limit, the regulator releases the pressure from the canister through the
whistle alarm.

AB.96.309

Air

OO

N

2

2

O

2

N2O Air

9

O2+

B

Air

O

N

2

Air

O

2

O

N

2

O

2

E

O

2

N2O

Air

CGO

Figure 2-7 • Induction machine tubing

2-8 09/06 1006-0452-000

CGO

2 Theory of Operation

AB.73.002

9

H

I

9O2 Supply Failure alarm assembly

BO

CGO Common gas outlet

G Canister, reservoir

H Alarm regulator

I Whistle

supply pressure at pneumatic manifold

2

9

H

B

I

G

G

B

Figure 2-8 • Induction machine components

1006-0452-000 09/06 2-9

Aestiva Anesthesia Machine

2.2.4 Wall-rail mount machine

The wall-rail mount machine (Compact and Induction) includes:

• pipeline inlet connections (

• an inlet connection for O

2

A) for O

backup regulated cylinder supply (B),

, N20, and Air (optional),

2

• an optional backup regulated cylinder supply inlet connection
for O

, N2O or Air (C),

2

• and an optional O

power outlet (D).

2

A regulated cylinder supply can be connected to the cylinder inlet
for O

, N2O or Air with an optional Cylinder Regulator (E).

2

To use a backup cylinder for gases that do not have a cylinder inlet, the
cylinder and pipeline supplies can be connected to the pipeline inlet using an
optional checked Y-adapter (

F).

Figure 2-9 shows the tubing connections for a wall-rail mount Induction
machine. The Compact wall-rail mount machine does not include the
pneumatic alarm assembly (G); it includes the standard pressure switches on
the O

flowmeter module and the common gas manifold (H).

2

AB.72.032

O2N2OAir

G

Air

O

D

N

2

O

2

A

H

O2+

CGO

B C

Standard Optional (1 of 3)

Figure 2-9 • Wall-rail mount machine tubing

2-10 09/06 1006-0452-000

2 Theory of Operation

AB.79.019

E

C

B

AD

AB.79.022

F

AB.79.006

Figure 2-10 • Wall-rail mount machine components

1006-0452-000 09/06 2-11

Aestiva Anesthesia Machine

2.2.5 System switch The system switch has two positions: Standby and On.

In the Standby position —

The switch:

• Cuts off power to the ventilator (electrical).

• Stops O2 and Air (pneumatic).

• Without O

In the On position —

The switch:

• Supplies power to the ventilator.

• Supplies O2 and Air.

• Adequate O

pressure, the balance regulators stop N2O, CO2, and Heliox.

2

pressure allows N2O, CO2, and Heliox gas flow.

2

l

m

2-12 09/06 1006-0452-000

2 Theory of Operation

2.2.6 Flow control Needle valves (one for each gas) adjust gas flows. Clockwise rotation

decreases flow. Counterclockwise increases flow. Mechanical stops set
minimum flows for all gases and maximum flows for CO
system sets the maximum ratio of N

O to O2.

2

wwwwWARNING The Link 25 Proportioning System sets a minimum O2 concentration in

the fresh gas stream when only O2 and N2O are used. Use of an absorber
or another gas can still cause a hypoxic mixture to be delivered,

especially at low O

flow rates.

2

and Heliox. The link

2

Minimum flows

At minimum flow, two tabs prevent clockwise rotation of the valve stem. One
tab is on the stop collar; the other is on the valve body.

Stop Tabs

Valve Body

Valve

Stem

Stop

Collar

Link system The chain link system helps assure an approximate minimum 1 to 3 ratio of

flow between O
on the O
N

2

O knobs turn together:

2

• an increase in N

•a decrease in O

and N2O. When engaged (minimum O2 concentration), a tab

2

knob is in contact with a tab on the O2 sprocket so that the O2 and

O flow causes an increase in O2 flow,

2

flow causes a decrease in N2O flow.

2

Linkage Tabs

O2 Knob

1006-0452-000 09/06 2-13

Aestiva Anesthesia Machine

Higher concentrations of O2 are possible when the link system is not engaged:
either by reducing the N
increasing O

When the N
turns the O

flow above the point of engagement.

2

O flow is below the point of engagement, increasing the N2O flow

2

sprocket without changing the O2 flow. At the point of

2

engagement, the tab on the O
knob. Once the linkage is engaged, turning the N
counterclockwise (increase in N
counterclockwise (increase in O
O

concentration.

2

Decreasing the N

2

sprocket away from the tab on the O
knob tab away from the sprocket tab. Either action increases the O
concentration above 25%. Sufficiently decreasing O
N

O flow brings the two tabs back into contact and engages the linkage.

2

The kick-in point is defined as the N
engaged with the O

O flow below the point of engagement or by

2

sprocket makes contact with the tab on the O2

2

O flow control

2

O flow) also turns the O2 knob

2

flow) to maintain a nominal 25% minimum

2

O flow from the engagement point rotates the tab on the O2

knob. Increasing the O2 flow rotates the

2

2

flow or increasing the

2

O flow at which the N2O valve becomes

2

valve flowing at 200 mL/min. This engagement point is

2

an arbitrary benchmark that assists in calibrating the proportioning system.
The position of the kick-in is set in the factory. During field calibration, you set
the O

flow to 200 mL/min and the N2O flow to the kick-in flow (usually in the

2

range of 400 to 700 mL/min) and then install the sprockets with the O

2

knob/sprocket engaged.

Maximum flows A maximum stop collar on the body of the needle valve and a stop collar on

the stem of the needle valve set the maximum CO

At maximum flow, a tab on the stop collar hits the tab on the maximum stop
collar and prevents you from turning the knob further counterclockwise. As
you decrease the flow, the valve stem moves toward the needle valve
assembly and clears the tab.

Valve Stem

Stop Collar

and Heliox flow.

2

Maximum
Stop Collar

Valve Body

2-14 09/06 1006-0452-000

2.3 Flow through the breathing system

2 Theory of Operation

2.3.1 Overview of flow paths

This section looks at three types of flow paths.

• Ventilation paths: How gas flows from the drive source (bag or bellows) to

and from the patient.

• Fresh gas paths: Fresh gas can flow directly to the patient circuit (Bain/

Mapleson D), into the absorber through the common gas outlet, or directly to
an external circuit through the optional auxiliary common gas outlet.

• Breathing circuit paths: The Aestiva has two breathing circuit modules—

Circle and Bain/Mapleson D. Each breathing circuit handles fresh gas,
recirculation, and exhaust flow differently.

1006-0452-000 09/06 2-15

Aestiva Anesthesia Machine

2.3.2 Manual ventilation — Circle Module

Manual inspiration The Bag/Vent switch closes the ventilator path (B)..

Gas flows from the bag (1), through the absorber (2), into the breathing circuit
module, and through a unidirectional valve (inspiratory check valve) to the
patient (3).

B

1

1

B

..

B Bag/Vent switch to Bag
1 Flow to absorber
2 Flow from absorber
3 Inspiratory flow

1

B

AB.23.128

2

3

1

3

2

1

2

1

Figure 2-11 • Gas flow during manual inspiration

2-16 09/06 1006-0452-000

2 Theory of Operation

Manual expiration The Bag/Vent switch keeps the ventilator path closed (B).

Gas flows from the patient (4), through a unidirectional valve (expiratory
check valve), and into the bag arm (5).

B

5

B

B Bag/Vent switch to Bag
4 Expiratory flow
5 Flow to bag

5

B

AB.23.130

5

4

4

Figure 2-12 • Flow during manual expiration

1006-0452-000 09/06 2-17

Aestiva Anesthesia Machine

APL Valve The APL valve (A) sets a pressure limit for manual ventilation.

As you turn the APL knob, it puts more or less force on the APL disc and seat
(D/S). If the circuit pressure is too high (6), the disc and seat inside the
diaphragm opens and vents gas to the scavenging system (7).

A

D/S

A APL Valv e
D/S APL disc and seat
6 APL flow
7 To scavenging

7

AB.23.131

6

7

Figure 2-13 • Flow through the APL Valve

2-18 09/06 1006-0452-000

2.3.3 Mechanical ventilation — Circle Module

Mechanical inspiration The Bag/Vent switch closes the manual path (V). Pilot pressure (P) closes the

exhalation valve.

Drive gas (D) pushes down on the bellows. Gas flows from the bellows (1),
through the absorber (2), and through a unidirectional valve (inspiratory
check valve) to the patient (3).

2 Theory of Operation

D

V

V Bag/Vent switch to Vent
P Pilot pressure
D Drive gas

1

V

D

1

V

3

2

1

3

2

1

P

D

P

D

2

1

1 Flow to absorber
2 Flow from absorber
3 Inspiratory flow

Figure 2-14 • Mechanical inspiration

1006-0452-000 09/06 2-19

Aestiva Anesthesia Machine

Mechanical expiration Drive-gas flow stops and the exhalation valve opens. Exhaled gas flows from

the patient (4), through a unidirectional valve (expiratory check valve) and
into the bellows (5). Residual drive gas (D) flows out of the bellows to the
scavenging system (6).

If PEEP is selected, static pressure on the pilot port of the exhalation valve
sets the PEEP level.

D

V

5

V

D

V Bag/Vent switch to Vent
D Drive gas
4 Expiratory flow
5 Flow to bellows
6 To scavenging

AB.23.133

5

V

6

5

4

6

4

6

Figure 2-15 • Flow through the APL Valve

2-20 09/06 1006-0452-000

2 Theory of Operation

Pop-off valve The pop-off valve limits the pressure inside the bellows to 2.5 cm H

the drive gas pressure. This normally occurs when the bellows reaches the top
of the housing at the end of exhalation.

Excess gas (7) vents to the scavenging system (6) through the pop-off valve
and the exhalation valve.

V

7

V

O above

2

AB.23.134

V Bag/Vent switch to Vent
6 To scavenging
7 Pop-off flow

V

7

6

6

Figure 2-16 • Flow through the pop-off valve

1006-0452-000 09/06 2-21

Aestiva Anesthesia Machine

2.3.4 Fresh gas flow

Common Gas Outlet only Fresh gas (1) flows from the common gas manifold of the anesthesia

machine and through the Common Gas Outlet (CGO) on the bulkhead.

During inspiration, fresh gas flows into the inspiratory limb (2) of the circle
module; then, into the patient circuit.

During exhalation, fresh gas flows backwards through the absorber (3) into
the expiratory limb of the circle module (4); then, out the scavenging system.

Note: There is no Fresh Gas Flow into the patient circuit during exhalation.

4

2

3

1 Fresh gas

1

3

AB.23.199

3

1

3

4

2

CGO

CGO Comman Gas Outlet
2 Fresh gas flow during inspiration
3 Fresh gas flow during exhalation
4 Flow to scavenging system

Figure 2-17 • Fresh gas flow

2-22 09/06 1006-0452-000

2 Theory of Operation

Auxiliary Common Gas Outlet In systems with an Auxiliary Common Gas Outlet (ACGO), the fresh gas (1)

from the common gas outlet manifold of the anesthesia machine first flows to
the ACGO. The ACGO switch directs the fresh gas flow either to the CGO
outlet on the bulkhead of the Breathing System or to the ACGO outlet at the
front of the Breathing System. The auxiliary outlet provides fresh gas to
external circuits.

The O

sensor is located in the circuit modules. A restricted port on the

2

bulkhead provides a fresh gas sample (2) for O

monitoring of the ACGO

2

outlet.

1

2

2

CGO

1 Fresh gas
CGO Comman Gas Outlet
ACGO Auxiliary Comman Gas Outlet
2 ACGO sample to O2 sensor

AB.23.135

1

2

ACGO

Figure 2-18 • Sampling and flow through the auxiliary fresh gas outlet

1006-0452-000 09/06 2-23

Aestiva Anesthesia Machine

2.3.5 Different breathing circuit modules

The earlier figures show the Circle breathing circuit module. This is the
standard module supplied with the system.

For specific needs, a Bain/Mapleson D breathing circuit module is also
available.

Each module has identification tabs as detailed in Section 2.4.3.

Bain/Mapleson D The Bain/Mapleson D module has:

• No check valves.

• Low compliance

• Passages that route the fresh gas (1) to the patient connection.

• Porting to the absorber is blocked (CO

2B

monitor is recommended).

2

2V

1

1 Fresh gas
2 Flow to/from patient
2B To/from bag
2V To/from bellows

AB.23.137

2V

2B

2

2

1

2

Figure 2-19 • Bain/Mapleson D breathing circuit module

2-24 09/06 1006-0452-000

2.3.6 CO2 Bypass

2 Theory of Operation

Note: The CO2 Bypass is an option that is not available in all markets.

The CO

Bypass is a mechanical assembly that takes the place of the top dish

2

of the absorber assembly. When in place, the upper housing of the bypass
assembly presses against the activator of a microswitch that is located in the
pan of the breathing system. This tells the ventilator that an absorber bypass
is installed in the machine.

With absorber canisters locked in place, the bypass assembly is compressed.
In the compressed state, valves inside the bypass assembly route the gas
flow through the absorber canisters, as in machines that do not have a bypass
installed.

When the absorber canisters are released, the bypass assembly expands. In
the expanded state, the valves in the bypass assembly route the gas back into
the main manifold, bypassing the canisters.

Additionally, when the bypass microswitch is activated (bypass installed) and
the canister release microswitch is not (release open), the ventilator displays
the “No CO

absorption” message.

2

CO2 Bypass

Figure 2-20 • CO2 Bypass

1006-0452-000 09/06 2-25

Aestiva Anesthesia Machine

2.3.7 Auxiliary Common Gas Outlet (ACGO)

When you pull the lever down (auxiliary position), a ramp in the lever pushes
on the T end of a spring loaded actuator rod. Seals on the rod send Fresh gas
and O

Flush gas to the auxiliary common gas outlet (ACGO). A portion of the

2

gas is diverted to the O
microswitch.

When you pull the lever up, the spring pushes the rod back to its resting
position, the seals send gas to the common gas outlet (CGO), and the pin
releases the switch.

sensor. A pin on the other end of the rod activates a

2

1. Lever

2. T end of actuator rod

3. Ramp

4. Fresh gas in

5. O

flush in

2

6. To common gas outlet (CGO)

7. Auxiliary common gas outlet (ACGO)

8. To O

9. Switch

10. Pin

sensor (via one-way valve)

2

10

8

6

4

5

9

7

2

1

3

AB.23.008

Figure 2-21 • Auxiliary Common Gas Outlet (ACGO) switch

2-26 09/06 1006-0452-000

2 Theory of Operation

2.4 Electrical and pneumatic signals

2.4.1 Summary of signals Refer to the appropriate ventilator service manual for further details.

Machine switches:

• The mains inlet switch on the AC Inlet module controls AC power to the
machine. The System switch on the front panel turns the machine On, or sets
the machine into Standby mode.

• The O

• The O

Breathing system switches:

• Optical switches in the bulkhead look for the type of breathing circuit module

•A microswitch on the shaft of the canister release looks for open canisters

•A microswitch in the pan of the Breathing System tells the ventilator if the

•A microswitch on the back of the control panel tells the system if the panel is

•A microswitch next to the Bag/Vent mechanism identifies the switch

•A switch on top of the auxiliary common gas outlet tells the system which

Supply pressure switch on the flowhead module monitors the

2

adequacy of the O2 supply.

Flush pressure switch on the Common Gas Manifold monitors the

2

activation of O2 Flush flow.

or if the module is missing.

(leak).

optional Absorber Bypass is installed. This permits operation with the
canisters open.

open (leak) or closed (APL and BTV functionality).

position. The system uses this to start and stop mechanical ventilation.

outlet is in use. With the auxiliary outlet in use, the ventilator is not
operational; only O

monitoring of fresh gas is available.

2

7900 SmartVent For machines with a 7900 SmartVent, the machine switches interface directly

with the CPU board. The breathing system switches and the following
pneumatic sample lines (refer to Figure 2-22) connect to the sensor interface
board (SIB):

•Manifold Pressure Transducer,

• Drive Gas Pressure Limit Switch (DPLS),

• Expiratory Flow Pressure Transducer,

• Inspiratory Flow Pressure Transducer,

• Patient Airway Pressure Transducer.

7100 Ventilator For machines with a 7100 Ventilator the machine switches interface with the

CPU board through the Serial Adapter board. The breathing system switches
and the following pneumatic sample lines (refer to Figure 2-23) connect to the
monitoring interface assembly (MIA):

• Inspiratory Flow Pressure Transducer,

• Expiratory Flow Pressure Transducer.

The patient airway pressure transducer for the 7100 Ventilator is located on
the pneumatic engine board.

1006-0452-000 09/06 2-27

Aestiva Anesthesia Machine

Control
Panel

Bag/Vent

Manifold
Pressure
Transducer

From ACGO microswitch From O2 Sensor

Open

Expiratory
Flow
Pressure
Transducer

J1

DPLS*

J2

J3

Inspiratory
Flow
Pressure
Transducer

Sensor
Interface
Board

Patient
Airway
Pressure
Transducer

J5
To CPU

J4

Bl

W

B = Black
W = White
Y = Yellow
Bl = Blue

*DPLS
(Drive Pressure Limit Switch)

Absorber
Bypass

AB.23.141

Canister
Release

Breathing
Circuit ID

Y

B

Flow Sensor
Bulkhead Connector

W

Pilot

Pressure

B

Drive
Gas

Figure 2-22 • Pneumatic and switch connections for machines with 7900 SmartVent

2-28 09/06 1006-0452-000

2 Theory of Operation

Control
Panel

Bag/Vent

Sensor

O

2

Inspiratory
Flow
Pressure
Transducer

From From
ACGO microswitch

Expiratory
Flow
Pressure
Transducer

WBl

B = Black
W = White
Y = Yellow
Bl = Blue

Monitoring
Interface
Assembly
(MIA)

Absorber
Bypass

To
Control
Board

AB.43.080

Canister
Release

BY

Flow Sensor
Bulkhead Connector

Breathing
Circuit ID

Figure 2-23 • Pneumatic and switch connections for machines with 7100 Ventilator

1006-0452-000 09/06 2-29

Aestiva Anesthesia Machine

2.4.2 Subfloor tubing and wiring connections

Figure 2-24 has the rear subfloor and the bulkhead cover removed to show
the tubing and the wiring.

Item Color Use with 7900 Ventilator Use with 7100 Ventilator

6 Blue Expiratory flow pressure transducer - Expiratory flow pressure transducer -

7Yellow Expiratory flow pressure transducer + Expiratory flow pressure transducer +

8 White Inspiratory flow pressure transducer - Inspiratory flow pressure transducer -

9 Black Inspiratory flow pressure transducer +and

Inspiratory flow pressure transducer +

patient airway pressure transducer

10 White Ventilator manifold pressure Not used

11 Black Ventilator drive gas pressure Not used

1

221

1. Inspiratory flow senor connections

2. Expiratory flow sensor connections

3. Tube connection for airway pressure
transducer (7100 only)

4. Sensor interface cable (Breathing Circuit ID
board, Flow sensors, CO
Canister switch, Bag/Vent switch, Cover
switch)

5. Sensor interface board (SIB -

7900)Monitoring interface assembly (MIA -

7100)

Bypass switch,

2

3

67

4

5

891011

Figure 2-24 • Pneumatic tubing connections

2-30 09/06 1006-0452-000

2.4.3 Breathing circuit module ID

Tabs on the back of the breathing circuit module and optical sensors on the
Module ID board tell the ventilator what type of module is connected.

2 Theory of Operation

1

Circle Module Bain/Mapleson D Module

1

2

1. Tabs

2. Module ID Board

Figure 2-25 • Module ID board

1006-0452-000 09/06 2-31

Aestiva Anesthesia Machine

2.4.4 Control panel switches

Figure 2-26 shows the Bag/Vent switch (1) and the control panel switch (2).

When the Bag/Vent switch is set to Bag, the contact is closed. When it is set to
Vent, the contact opens.

When you close the control panel the contact is closed. When you open the
panel, the contract opens.

12

Figure 2-26 • Control panel switches

2-32 09/06 1006-0452-000

2.4.5 Canister switch

1

1. Canister release

2. Cam

3. Collar

4. Tongue

5. Switch

2 Theory of Operation

Figure 2-27 shows the canister switch. When the canister release is closed, a
tongue pushes in the contact and an off-center cam pushes the canisters up.
To open the release, pull it forward. When the collar clears the stop, turn the
release clockwise. This moves the tongue away from the contact, which
opens, and moves the cam away from the canisters.

2

5

43

Release closed

(Viewed from bottom, looking up on switch)

Figure 2-27 • Canister release switch

Release open

1006-0452-000 09/06 2-33

Aestiva Anesthesia Machine

2.5 Ventilator monitoring and control

2.5.1 Summary of

ventilator function

The Aestiva machine may contain either a model 7100 or 7900 Ventilator. The
following explains the common controls and functions of these ventilators and
their interaction with the Aestiva machine. See the specific Ventilator TRM for
additional information.

Both models provide basic ventilator functions, plus optional advanced
functions. This section covers the basic functions specific to the 7900
Ventilator. Some of these functions are optional on the 7100 Ventilator and
may not be present on all machines. Basic functions on the 7900 include
Volume Mode, Pressure Mode, PEEP, O
Volume Compensation, and Pressure Waveform.

Monitoring, Volume Monitoring,

2

2.5.2 Volume Mode Volume mode function (VCV) allows the user to select the desired tidal

volume, respiratory rate, I:E ratio, airway pressure limit, and PEEP. The
ventilator software uses the set rate and I:E ratio to determine the inhalation
time period;

• for example, with Rate at 10/min and I:E ratio at 1:1,
the inspiration time will be 3 seconds.

It then determines what velocity of drive gas must be delivered during the
inspiratory time to deliver the set tidal volume;

• for example, with VT at 500 ml, Rate at 10/min and I:E ratio at 1:1,
500ml / 3 seconds = 166.6 ml/sec or 10 L/min.

The amount of current required to open the flow valve enough to deliver the
determined velocity is stored in a look-up table. In 7900 models, all flow
valves are built to this table specification. (For 7100 - The table is established
during the flow valve calibration based on the specific characteristics of the
flow valve installed.)

2.5.3 Pressure Mode Pressure mode function (PCV) allows the user to select the desired airway

pressure, respiratory rate, I:E ratio, airway pressure limit, and PEEP. The
software uses the rate and I:E ratio to determine the inspiratory time. It then
opens the flow valve to a set flow of 80 LPM and monitors the airway pressure.
When the set pressure plus PEEP is achieved, it reduces flow to a point that
maintains the set pressure for the duration of the inspiratory time. The current
to the flow valve required to maintain the reduced flow rate (Plateau) is set
based on a look-up table created by the Bleed Resistor calibration (7900).
The Plateau pressure is a controlled-loop process and the current to the flow
valve is adjusted to maintain the target pressure. (The 7100 table is
established during the PEEP valve calibration and uses open-loop control;
therefore, the accuracy is based on the last calibration and can be affected by
leaks and circuit characteristics.)

2-34 09/06 1006-0452-000

2 Theory of Operation

2.5.4 PEEP PEEP (Positive End Expiratory Pressure) can be used in either VCV or PCV and

is controlled by software in a similar function to the Plateau Phase, as
described in the Pressure Mode section. This value is based on a look-up
table created by the calibrations preformed in the Bleed Resistor calibration
(7100 - PEEP valve calibration).

2.5.5 O2 Monitoring O

monitoring is standard on 7900 and optional on 7100 models. A galvanic

2

O

cell located in the inspiratory side of the circuit monitors the concentration

2

of oxygen in the breathing circuit. Calibration can be done from the users
screens or from the service mode. Oxygen concentration is displayed on the
ventilator screen. The O
volumes. Inaccurate O
readings.

value is also used in the formula to calculate tidal

2

readings can result in inaccurate expired tidal volume

2

2.5.6 Volume Monitoring Volume monitoring is standard on 7900 and optional on 7100 models. A

pressure differential transducer measures the pressure on each side of a
Variable Flow Orifice (Flow Sensor) placed on the expiratory side of the
absorber. This pressure differential equates to the velocity of the gas passing
through the orifice. Measuring a “Volume of a gas” in a dynamic state is very
complicated. Even volume displacement devices (such as water columns)
have a calibrated scale that converts the displaced element (water) to an
equivalent amount of the gas being measured. Volume of a gas changes with
composition, temperature, pressure and saturation. The three most used
constants for indicating gas volume are ATP (Atmospheric Temperature and
Pressure), BTPS (Body Temperature, Pressure, Saturated), and STP (Standard
Temperature and Pressure). Volume readings on Aestiva machines are
displayed as ATP. Many respiratory gas monitors display volumes as BTPS.
There can be as much as a 10% difference in these displayed values. It does
not indicate a failure of either device, most likely the actual volume is
somewhere between these two calculations.

2.5.7 Volume

Compensation

1006-0452-000 09/06 2-35

Volume compensation is standard on 7900 and optional on 7100 models. It
is only applicable in Volume Control Ventilation. A pressure differential
transducer measures the pressure on each side of a Variable Flow Orifice
(Flow Sensor) placed on the inspiratory side of the absorber. This pressure
differential equates to the velocity of the gas passing through the orifice. This
value is not displayed in the normal mode but can be viewed in service mode.
During volume ventilation, the velocity of the gas passing through the
inspiratory flow sensor is compared to the velocity of the gas coming from the
flow valve. If there is a difference, the current to the flow valve will be modified
to achieve the required output. If the volume compensation option is active,
the first breath will be delivered based on flow valve calibration. Information
from the inspiratory flow sensor is then used to verify the flow and adjust it if
needed. The next delivered breath is adjusted by 50% of the difference
between the set value and the value measured at the inspiratory flow sensor.

There are specific conditions that will trigger the compensation feature off, or
locked, depending on the software revision.The ventilator will still deliver in
volume mode based on the set value (or the last know correctly compensated

Aestiva Anesthesia Machine

value). The message “Vt comp off (locked) – pressure mode available” will be
displayed. This is a medium level warning message indicating that the
clinician should ensure the volume being delivered is acceptable; the
deflection of the bellows gives an approximation of the volume delivered to
the patient. Volume mode can be continued and any compensation
necessary can be made manually by changing the set volume. It is not
necessary to switch to pressure mode but pressure mode is available as an
option.

Compensation will not resume until the reason it was disabled is corrected
and the user re- selects volume mode as the ventilator option.

2.5.8 Pressure Waveform Pressure wave form is standard on 7900 and optional on 7100 models. It

allows the ventilator to display the airway pressure waveform.

2-36 09/06 1006-0452-000

3 Checkout Procedure

In this section 3.1 Inspect the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.2 Electrical safety tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.3 Power failure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.4 Minimize alarms (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.5 Pipeline and cylinder tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

3.6 Flow control and pressure relief tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3.7 Vaporizer back pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

3.8 Flow sensor check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

3.9 Low-pressure leak test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

3.10 Alarm tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

3.11 Breathing system tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

3.12 Auxiliary O2 flowmeter tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

3.13 Integrated Suction Regulator tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21

wwwwWARNINGS After any repair or service of the Aestiva, complete all tests in this section.

Before you do the tests in this section:

• Complete all necessary calibrations and subassembly tests. Refer to the
individual procedures for a list of necessary calibrations.

• Completely reassemble the system.

If a test failure occurs, make appropriate repairs and test for correct operation.

1006-0452-000 09/06 3-1

Aestiva Anesthesia Machine

3.1 Inspect the system

wwwwCAUTION The weight limit on each accessory shelf is 46 kg (100 lb).

Systems without accessory shelves have a weight limit on the top
surface of 46 kg (100 lb).

The folding side shelf has a weight limit of 23 kg (100 lb).

Make sure that:

1. The equipment is not damaged.

2. All components are correctly attached.

3. Pipeline gas supplies are connected.

4. Cylinder valves are closed on models with cylinder supplies.

wwwwWARNING Do not leave gas cylinder valves open if the pipeline supply is in use.

Cylinder supplies could be depleted, leaving an insufficient reserve
supply in case of pipeline failure

5. Models with cylinder supplies have a cylinder wrench attached to the
system.

6. On trolley model, make sure the casters are not loose and the brake is set
and prevents movement.

— OR —

AA.96.100

.

AB.72.014

3.2 Electrical safety tests

Make sure the system is completely assembled and all accessory devices are
connected to electrical outlets.

1. Connect an approved test device (e.g. UL, CSA, or AAMI) and verify that the
leakage current is less than:

Voltage Max. Leakage Current

120/100 Vac 300 µAmps

220/240 Vac 500 µAmps

2. Make sure that the resistance to ground is less than 0.2Ω between an
exposed metal surface and the ground pin on the power cord.

3-2 09/06 1006-0452-000

3.3 Power failure test

3 Checkout Procedure

1. Connect the power cord to a wall outlet. The mains indicator comes on
when AC Power is connected.

AB.29.007

If the indicator is not on, the system does not have mains (electrical) power.
Use a different outlet. Close the circuit breaker or replace or connect the
power cable.

2. Set the system switch to On.

3. Unplug the power cord with the system turned on.

4. Make sure that the power failure alarm comes on.

5. Make sure the following message is on the ventilator display:

• “On Battery - Check Power” for 7900 ventilator,

• “On Battery - Power OK?” for 7100 ventilator.

6. Connect the power cable again.

7. Make sure the alarm cancels.

3.4 Minimize alarms (optional)

Set the ventilator controls to decrease the number of alarms.

1. Control Keys:

• Volume alarms: OFF

• Plimit: 100 cm H

2. Alarm menu:

AA.96.240

O

2

• Low O

• High O

: 21%

2

: OFF

2

3. Bag/Vent switch: Bag

1006-0452-000 09/06 3-3

Aestiva Anesthesia Machine

3.5 Pipeline and cylinder tests

wwwwCAUTION To prevent damage:

• Open the cylinder valves slowly.

• Do not force the flow controls.

If your system does not use cylinder supplies, do not do steps 2 and 3.

1. Disconnect the pipeline supplies and close all cylinder valves.If the
pipeline and the cylinder pressure gauges are not at zero:

a. Connect an O

supply.

2

b. Turn On the system, if it is not already on.

c. Set the flow controls to mid range.

d. Make sure that all gauges but O

e. Disconnect the O

f. Make sure that the O

alarms for low O

supply.

2

gauge goes to zero. As pressure decreases,

2

supply pressure should occur.

2

go to zero.

2

2. Make sure that the cylinders are full:

a. Open each cylinder valve.

b. Make sure that each cylinder has sufficient pressure. If not, close the

applicable cylinder valve and install a full cylinder.

3. Test one cylinder at a time for high pressure leaks:

a. Set the system switch to Standby, which stops the O

flow.

2

b. Disconnect all accessories from the pneumatic outlet.

c. Turn OFF the auxiliary O

flowmeter.

2

d. Open the cylinder.

e. Record the cylinder pressure.

f. Close the cylinder valve.

g. Record the cylinder pressure after one minute. If the pressure

decreases more than indicated below, there is a leak.

690 kPa (100 psi) for machines with 7900 Ventilator

5000 kPa (725 psi) for machines with 7100 Ventilator

Install a new cylinder gasket and do this step again.

h. Repeat step 3 for all cylinders.

i. Close cylinder valves.

3-4 09/06 1006-0452-000

3 Checkout Procedure

wwwwWARNING Do not leave gas cylinder valves open if the pipeline supply is in use.

Cylinder supplies could be depleted, leaving an insufficient reserve
supply in case of pipeline failure

4. Connect one pipeline supply at a time.

• Ensure that the appropriate gauge corresponds to the connected gas

supply.

5. Use the chart below to check pipeline pressure:

.

ANSI (USA and Intl.), Australian, Canadian, French,
Japanese

ISO, Italian, Scandinavian, South African, Spanish,
Swiss

Austrian, German 500 kPa (75 psig)

345 kPa (50 psig)

414 kPa (60 psig)

1006-0452-000 09/06 3-5

Aestiva Anesthesia Machine

3.6 Flow control and pressure relief tests

wwwwWARNING Nitrous oxide (N2O) flows through the system during this test. Use a safe

and approved procedure to collect and remove it.

1. Set up the gas scavenging system.

a. Connect the AGSS to a gas scavenging system.

b. Attach a patient circuit and plug the patient port.

c. Attach a bag to the bag arm.

d. Set the Bag/Vent switch to Bag.

e. Adjust the APL valve to minimum.

2. Connect the pipeline supplies or slowly open the cylinder valves.

3. Turn all flow controls fully clockwise (minimum flow).

4. Turn on the system.

5. Confirm that the O
O

. If not, calibrate the O2 sensor.

2

6. Make sure the O
other flowtubes must show no gas flow.

7. Set the flow controls to mid range of each flowtube and make sure that the
flowtube floats rotate and move smoothly.

8. Check the proportioning system concentration (increasing N2O flow).
Observe the following precautions:

a. Start with all valves at the minimum setting.

b. Adjust only the N

c. Increase the N

the O

2

Note Allow the O

take up to 90 seconds to stabilize.

d. If you overshoot a setting, turn the O2 flow control clockwise until the

N

O flow decreases to the previous setting before continuing the test.

2

sensor measures 21% in room air and 100% in pure

2

flowtube shows approximately 25 to 75 mL/min. The

2

O flow control.

2

O flow as specified in the following table and make sure

2

concentration is in range.

monitor to stabilize. At the lower flows, the O2 monitor may

2

Set the N2O flow (L/min) Measured O

2

0.15 21% minimum

0.5 21% minimum

0.8 21% to 30%

1.0 21% to 30%

3.0 21% to 30%

6.0 21% to 30%

9.0 21% to 30%

3-6 09/06 1006-0452-000

3 Checkout Procedure

9. Check the proportioning system concentration (decreasing O2 flow).
Observe the following precautions:

a. Start with N

b. Adjust only the O

c. Decrease the O

concentration is in the allowed range.

Note Allow the O

take up to 90 seconds to stabilize.

d. If you overshoot a setting, turn the N

until the O
test.

10. Check the linearity of the flow control for each additional gas. Use the

appropriate table shown below.

O valve at the maximum setting.

2

flow control.

2

flow as specified in the table and make sure the O2

2

monitor to stabilize. At the lower flows, the O2 monitor may

2

O flow control counterclockwise

2

flow increases to the previous setting before continuing the

2

Set the O2 flow (L/min) Measured O

3.0 21% to 30%

2.0 21% to 30%

1.0 21% to 30%

0.3 21% to 30%

2

Set the O2 flow (L/

min)

4.0 3.0 61% to 71%

3.5 6.0 45% to 55%

1.5 8.0 28% to 38%

Set the O2 flow (L/

min)

4.0 3.0 63% to 73%

3.5 6.0 48% to 58%

1.5 8.0 32% to 42%

Set the O2 flow (L/

min)

2.0 0.2 86% to 96%

0.5 0.5 45% to 55%

Set the Air flow (L/min) O2 monitor range

Heliox —25% O2, 75% He

(L/min)

CO2 (L/min) O2 monitor range

O2 monitor range

1006-0452-000 09/06 3-7

Aestiva Anesthesia Machine

11. Check the pressure relief valve (vaporizer manifold outlet).

a. Turn all flow controls fully clockwise (minimum flow).

b. Connect a gauge or a digital manometer to the Common Gas Outlet

(CGO). Do not connect to the Auxiliary Common Gas Outlet (ACGO).

c. Adjust the O

flow to 1 L/min.

2

d. Verify that the test device reading stabilizes within the following range:

31–60 kPa, 230–450 mm Hg, 4.5–8.5 psi.

AB.23.098

CGO

12. Set all flow controls to 3 L/min.

13. Stop the O

supply. (Disconnect the pipeline supply or close the cylinder

2

valve.)

14. Make sure that:

a. The low O

O, CO2, Heliox, and O2 flows stop. The O2 flow stops last.

b. N

2

supply alarm occurs.

2

c. Air flow continues.

d. Gas supply alarms occur on the ventilator if the ventilator uses O

the drive gas.

15. Turn all of the flow controls fully clockwise (minimum flow).

16. Reconnect the pipeline supplies.

2

as

3-8 09/06 1006-0452-000

3.7 Vaporizer back pressure test

wwwwWARNING Anesthetic agent vapor comes out of the common gas outlet during this

test. Use a safe, approved procedure to remove and collect the agent.

1. Set up the gas scavenging system.

a. Connect the AGSS to a gas scavenging system.

b. Attach a patient circuit and plug the patient port.

c. Attach a bag to the bag arm.

d. Set the Bag/Vent switch to Bag.

e. Adjust the APL valve to minimum.

2. Turn the system on. Alarms can occur.

3 Checkout Procedure

3. Set the O

4. Make sure that the O

flow to 6 L/min.

2

flow stays constant and the float moves freely.

2

5. Adjust the vaporizer concentration from 0 to 1% one click at a time. The O
flow must not decrease more than 1 L/min through the full range. If the O
flow decreases more than 1 L/min:

a. Install a different vaporizer and try this step again.

b. If the O

flow decreases less than 1 L/min with a different vaporizer, the

2

malfunction is in the first vaporizer.

c. If the O

flow also decreases more than 1 L/min with a different

2

vaporizer, the malfunction is in the Aestiva. Do not use the Aestiva
system until it is serviced (repair vaporizer manifold port valve).

6. Complete steps 3 through 5 for each vaporizer and vaporizer position.

7. Set the system switch to Standby.

2

2

1006-0452-000 09/06 3-9

Aestiva Anesthesia Machine

3.8 Flow sensor check

The test device used in the following procedure must have an
accuracy to ± 2.5% or greater (refer to Section 8.1).

This procedure checks the raw velocity measurement made by the
flow sensor; therefore, any error inherent in the conversion to volume
is eliminated. This is true for both the ventilator flow sensors and the
test device. The flow valve calibration is also verified.

1. Remove the bellows housing.

2. Remove and set aside the bellows assembly and the pressure
relief valve.

3. Reinstall the bellows housing.

4. Remove the flow sensor module and take off the cover.

5. Remove the expiratory flow sensor from the flow sensor module.

6. Reinstall the flow sensor module with the expiratory flow sensor
connected but not seated in the circuit module.

7. Ensure both sensors are plugged into the bulkhead connector.

8. Connect a test flow device in series with the inspiratory flow
sensor (ensure the correct flow direction).

9. Connect a short piece of patient tubing between the inspiratory
flow sensor and the removed expiratory flow sensor.

3-10 09/06 1006-0452-000

3 Checkout Procedure

10. Go to the flow valve test tool screen in the service mode.

• Follow the menu structure outline below to reach the adjustment for the
inspiratory flow valve. Select and confirm at each step.

7900 7100

“Flow Valve Test Tool”

“Set Flow (LPM)”

“Diagnostics Tests/Tools”

“Valves - Test Tool”

“Set Inspiratory Valve”

• For the 7100:

— “Set PEEP Safety Valve” to “Open”.

— “Set PEEP Valve” to “100 cm H

O”.

2

• For the 7900:

— Occlude the bleed resistor outlet.

11. Select flows of 10, 20, 30, and 50.

12. At each flow:
Record the absolute value of the inspiratory and expiratory flow sensors.
(

Inspiratory and Expiratory flows will have different signs (+ and -); these are flow

direction indicators only.

)

• The flow sensor readings should be within 10% of the test device.

13. If all flow sensors agree but are more than 10% from the set value:

• check for leaks in the drive gas circuit,

• perform all calibrations and recheck.

14. If no improvement,

• For the 7100, calibrate the flow valve.

• For the 7900, replace the flow valve.

15. Shut off the flow.

16. Switch the position of the inspiratory and expiratory flow sensors.

This will reverse the flow through the sensors and give an indication of aging on

(

the internal flapper. As the flapper gets older and is subjected to repeated
cleaning, it tends to harden and lose its original shape.)

17. Repeat step 11.

• Compare the current expiratory flow to the recorded inspiratory flow

without regard for the sign. If there is more than a 10% difference,
replace the flow sensor currently on the expiratory side.

• Compare the current inspiratory flow to the recorded expiratory flow

without regard for the sign. If there is more than a 10% difference,
replace the flow sensor currently on the inspiratory side.

1006-0452-000 09/06 3-11

Aestiva Anesthesia Machine

3.9 Low-pressure leak test

wwwwWARNING Do not use a system with a low-pressure leak. Anesthetic gas will go into

the atmosphere, not into the breathing circuit.

Negative low-pressure leak test

Induction Machine

CGO

1. Turn on the auxiliary common gas outlet (ACGO — some models).

AB.23.063

ACGO

2. Or, access the common gas outlet (CGO).

AB.23.098

AB.73.002

CGO

3. Test the leak test device:

a. Put your hand on the inlet of the leak test device. Push hard for a good

seal.

b. Squeeze the bulb to remove all air from the bulb.

c. If the bulb completely inflates in less than 60 seconds, replace the leak

test device.

3-12 09/06 1006-0452-000

AB.23.099

3 Checkout Procedure

4. Set the system switch to Standby.

5. Turn off all vaporizers.

6. Test the anesthesia machine for low-pressure leaks:

a. Turn the flow controls one and a half turns counterclockwise (CO

maximum flow).

b. Connect the test device to the common or auxiliary gas outlet.

c. Compress and release the bulb until it is empty.

d. The vacuum causes the floats to move. This is usual. If the bulb

completely inflates in 30 seconds or less, there is a leak in the low­pressure circuit.

7. Test each vaporizer for low-pressure leaks:

a. Set the vaporizer to 1%.

b. Repeat step 6.

c. Set the vaporizer to OFF.

d. Test the remaining vaporizers.

8. Disconnect the test device.

9. Turn all flow controls fully clockwise (minimum flow). Do not over tighten.

ww

ww

WARNING Agent mixtures from the low-pressure leak test stay in the system.

Always flush the system with O

after the low-pressure leak test (1 L/min

2

for one minute).

to

2

Turn off all vaporizers at the end of the low-pressure leak test.

10.Remove all condensate from the breathing circuit module.

11. Assemble the breathing system (if previously disassembled).

12. Flush the system with O

a. Set the system switch to On.

b. Set the O

flow to 1 L/min.

2

c. Continue the O

d. Turn the O

flow control fully clockwise (minimum flow).

2

e. Set the system switch to Standby.

:

2

flow for one minute.

2

1006-0452-000 09/06 3-13

Aestiva Anesthesia Machine

ISO or BSI standard low-

pressure leak test

Induction Machine

CGO

Note (for systems with an ACGO): The ACGO includes a one-way valve that

directs a small sample of gas to the O2 sensor. Due to this, you cannot use
positive-pressure to perform a low-pressure leak test through the auxiliary
outlet.

1. If ACGO is present, set the Outlet switch to common gas outlet.

1. Access the common gas outlet (CGO).

CGO

AB.23.098

AB.73.002

2. Connect the leak test device to the common gas outlet with a section of

tubing. For Induction Machines, connect the test device directly to the
common gas outlet.

Note: Keep the flow tube
vertical for accurate
results.

AB.23.101

3. Fully close all flow controls.

4. Fully open the needle valve on the test device.

wwww CAUTION If the needle valve is not fully open, this test can damage the pressure

gauge on the test device.

3-14 09/06 1006-0452-000

3 Checkout Procedure

5. Open the Air or N2O flow control and set a total flow of 0.4 L/min through

the flowmeter on the test device.

6. Make sure that the pressure gauge on the test device reads zero and that

all other flow controls are fully closed.

7. Close the needle valve on the test device until the test gauge reads:

ISO 5358 3 kPa

BSI 4272.3 20 kPa

8. If the flow through the test device is less than 0.35 L/min (ISO) or 0.3 L/

min (BSI), there is a low pressure leak in the anesthesia machine.

9. Test each vaporizer for low-pressure leaks:

a. Set the vaporizer to 1%.

b. Repeat steps 3 through 8.

c. Fully open the needle valve on the test device to decrease the back

pressure.

d. Turn the vaporizer OFF.

e. Test the remaining vaporizers.

ww

ww

WARNING Agent mixtures from the low-pressure leak test stay in the system.

Always flush the system with O

after the low-pressure leak test (1 L/min

2

for one minute).

Turn all vaporizers OFF at the end of the low-pressure leak test.

10. Remove all condensate from the breathing circuit module.

11. Assemble the breathing system.

12. Flush the system with O

a. Set the system switch to On.

b. Set the O

flow to 1 L/min.

2

c. Continue the O

d. Turn the O

flow control fully clockwise (minimum flow).

2

e. Set the system switch to Standby.

:

2

flow for one minute.

2

1006-0452-000 09/06 3-15

Aestiva Anesthesia Machine

3.10 Alarm tests

1. Connect a test lung to the patient connection.

2. Set the Bag/Vent switch to Vent.

3. Set the system switch to On.

4. Set the controls:

• Ventilation Mode: Volume control

• Ventilator:
Tidal Vol: 400 ml
Rate: 12
I:E Ratio: 1:2
Plimit: 40 cm H

O

2

PEEP: OFF

• Anesthesia Machine
O

flow: minimum flow (25–75 mL/min)

2

All other gases: OFF

5. Push O2 Flush to fill the bellows.

6. Make sure that:

a. Mechanical ventilation starts.

b. A subatmospheric pressure alarm does not occur.

Note: With active gas scavenging, too much scavenging flow can cause
subatmospheric alarm.

c. The ventilator displays the correct data.

d. The bellows inflate and deflate during mechanical ventilation.

7. Set the O

flow control to 5 L/min.

2

8. Make sure that:

a. The end expiratory pressure is approximately 0 cm H

O.

2

Note: Positive end expiratory pressure when PEEP is off may indicate
that the scavenging system is not removing enough gas.

b. The ventilator displays the correct data.

c. The bellows inflate and deflate during mechanical ventilation.

9. Test the low minute volume alarm:

a. Go to the alarms menu.

b. Set the alarm limit for low minute volume to 6.0 L/min.

c. Make sure that a low minute volume alarm occurs.

d. Go to the alarms menu.

e. Set the low minute volume alarm to OFF.

3-16 09/06 1006-0452-000

10. Test the high airway pressure alarm:

3 Checkout Procedure

a. Set P

to less than the peak airway pressure.

limit

b. Make sure that the high airway pressure alarm occurs.

c. Set P

to correct level.

limit

11. Test the low airway pressure alarm:

a. Remove the test lung from the patient connection.

b. Make sure that the low airway pressure alarm occurs.

• Other alarms such as low minute volume can occur.

12. Test the sustained airway pressure alarm:

a. Set the controls:

APL valve Closed

Bag/Vent switch Bag

b. Mechanical ventilation stops when the Bag/Vent switch is set to Bag.

c. Close the patient connection and push the O

Flush button.

2

d. Make sure that the sustained pressure alarm occurs after

approximately 15 seconds at the sustained pressure limit (6-30 cm
H

O varies with pressure limit).

2

13. Test the apnea alarm:

a. Remove the test lung from the patient connection.

b. Make sure that the apnea alarm occurs (the apnea alarm occurs after

30 seconds).

• Other alarms such as low minute volume can occur.

14.Test the O

a. Remove the O

b. Make sure the sensor measures approximately 21% O

c. Set the low O

d. Set the low O

e. Put the O

f. Set the High O

monitor and alarms:

2

sensor from the circuit module.

2

alarm to 50%. Make sure a low O2 alarm occurs.

2

alarm back to 21% and make sure that alarm cancels.

2

sensor back in the circuit.

2

alarm to 50%.

2

in room air.

2

g. Push the flush button to fill the breathing system.

h. Make sure the high O

i. Set the high O

2

j. After 2 minutes in pure O

O

.

2

alarm comes On.

2

alarm back to 100% and make sure that alarm cancels.

, the sensor measures approximately 100%

2

15. Set the system switch to Standby.

1006-0452-000 09/06 3-17

Aestiva Anesthesia Machine

3.11 Breathing system tests

ww

ww

WARNING Objects in the breathing system can stop gas flow to the patient. This can

cause injury or death:

• Do not use a test plug that is small enough to fall into the breathing
system.

1. Verify that AGSS is operating. Breathing systems with active scavenging

have a flow indicator (A) on the side. Make sure that the flow indicator
shows a flow in the green (normal) region.

2. With a circle breathing module, push the drain button (B) for 10 seconds

or more to drain condensate into the absorber.

AB.23.100

(A)

(B)

3. Zero the pressure gauge (Section 6.6).

One-way Valves 4. Make sure that the one-way valves on the Circle breathing circuit module

work correctly:

a. The Inspiratory check valve rises during inspiration and falls at the start

of expiration.

b. The Expiratory check valve rises during expiration and falls at the start

of inspiration.

Note: The Bain/Mapleson D circuit module does not have one-way valves.

3-18 09/06 1006-0452-000

3 Checkout Procedure

Ventilator Bellows 5. Ventilator bellows test:

a. Set the system switch to Standby.

b. Set the Bag/Vent switch to Ventilator.

c. Set all flow controls to minimum.

d. Close the breathing circuit at the patient connection. Use your hand or

the test plug located in the handle of the breathing system.

e. Push the O

f. The pressure must not increase to more than 15 cm H

flush button until the bellows is full.

2

O on the

2

pressure gauge.

g. Release the flush button. If the bellows falls more than 100 mL/min, it

has a leak.

Service Mode Tests 6. Enter the Service Mode: Push and hold the adjustment knob on the

ventilator’s display and set the system switch to On.

a. Select and confirm “Service Mode(s).”

b. Follow the menu structure outline below to reach the adjustment for the

inspiratory flow valve. Select and confirm at each step.

7100 7900 (4.X) 7900 (1.X/3.X)

“Diagnostics Tests/Tools” “Breathing System Leak Test”

“Breathing System Leak Test”

c. Follow the instructions on the screen.

Bag Circuit 7. Test the Bag circuit for leaks:

a. Set the system switch to On.

b. Set the Bag/Ventilator switch to Bag.

c. Plug the Bag port; use your hand or the approved test plug.

d. Close the APL valve.

e. Set the O

f. Close the patient connection (using a hand or test plug on the breathing

system handle) and pressurize the bag circuit with the O
to approximately 30 cm H

g. Release the flush button. The pressure must not decrease. A pressure

decrease large enough to see on the gauge indicates a leak. Look for
and repair the leak (open drain plug, open canister, breathing circuit
assembly not pushed on completely).

flow to 200 mL/min.

2

“Test for Leaks”

flush button

2

O.

2

h. If your system has a CO2 bypass, move the absorber canister release to

the bypass position and repeat steps f and g to look for leaks in the
bypass mode.

1006-0452-000 09/06 3-19

Aestiva Anesthesia Machine

APL Valve 8. Test the APL valve:

a. Check and zero the pressure gauge as required (Refer to section 6.6).

b. Ensure that the AGSS is on and operational.

c. Plug the patient connection by connecting it to the test port on the

handle.

d. Plug the bag arm with a test plug.

e. Fully open the APL to MIN.

f. Set the O

gauge should not exceed 3.0 cm H

flow to 3 L/min. The pressure indicated on the pressure

2

O.

2

g. Adjust the total fresh gas flow to 30 L/min*. The pressure indicated on

the pressure gauge should not exceed 4.0 cm H

O.

2

h. Check the valve at mid-range settings of about 20, 30, and 50 while

flowing 30 L/min. Note that scale markings are only approximate. The
pressure should stabilize at each setting; however, fluctuations within
an 8 cm H
valve exhibits a tactile detent feel when turning in the 30–70 cm H

O range (min to max) are acceptable**. Ensure that the APL

2

O

2

range and that the knob does not rotate on its own.

i. Set the APL to 70 while flowing 30 L/min. The pressure indicated on the

pressure gauge should be between 60–85 cm H

O, including any

2

fluctuations**.

j. Set the APL to MIN.

k. Remove the plug from the bag arm and replace it with the bag. The bag

should fully inflate.

l. Reduce the O

flow to minimum and all other flow controls off.

2

m. The bag should remain inflated.

* To achieve 30 L/min total fresh gas flow, set the O2 flow to 15 L/min and the

Air flow to 15 L/min. Alternatively, set the O2 flow to 15 L/min and the N2O flow
to the maximum stop less approximately 1/2 turn.

ww

ww

WARNING

Nitrous oxide flows through the system during this test. Use a safe and
approved procedure to collect and remove it.

** Pressure fluctuations can occur with this test due to the steady high flow rate

used. However, there should be no fluctuations or spikes outside of an 8 cm
H2O range (min to max) at any setting. This will not occur during normal
bagging operation with lower fresh gas flow rates.

9. Set the System switch to Standby

ww

ww

WARNING Make sure that there are no test plugs or other objects caught in the

breathing system.

3-20 09/06 1006-0452-000

3.12 Auxiliary O2 flowmeter tests

1. Open the O2 cylinder valve or connect an O2 pipeline.

2. Rotate the flow control clockwise (decrease) to shut off the flow. The ball

should rest at the bottom of the flow tube and not move.

3. Rotate the flow control counterclockwise (increase). The ball should rise

immediately after rotation is begun. It should rise smoothly and steadily
with continued counterclockwise rotation. When a desired flow is set, the
ball should maintain in a steady position.

4. Occlude the auxiliary O

flow tube and not move. A ball that does not rest at the bottom of the flow
tube indicates a leak and requires service.

5. Rotate the flow control clockwise to shut off the flow.

3.13 Integrated Suction Regulator tests

3 Checkout Procedure

outlet. The ball should rest at the bottom of the

2

The gauge needle should come to rest within the zero range bracket when no
suction is being supplied. Gauges which do not comply may be out of
calibration.

1. Adjust the regulator setting to minimum.

2. Turn the mode selector to I (On).

3. Ensure the gauge remains less than 200 mmHg (26 kPa, 0.26 Bar).

4. Occlude the inlet.

5. Ensure the gauge remains less than 200 mmHg (26 kPa, 0.26 Bar).

6. Adjust the regulator in an increasing vacuum level.

7. The gauge should rise after rotation has begun. The gauge should rise with

continued rotation of the regulator adjustment.

8. Adjust the regulator setting to minimum.

9. Turn the Mode selector to O (Off).

1006-0452-000 09/06 3-21

Notes

3-22 09/06 1006-0452-000

4 Repair Procedures

In this section This section covers the repair and replacement procedures for components of the

Aestiva Anesthesia Machine.

4.1 Servicing the ventilator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

4.2 How to bleed gas pressure from the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

4.3 How to remove the rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

4.4 How to remove the side panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

4.5 Service the pipeline inlet (pneumatic) manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.5.1 Remove pneumatic manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

4.5.2 Replace pipeline inlet fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

4.5.3 Replace pipeline inlet filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

4.5.4 Replace pipeline inlet check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4.5.5 Replace pneumatic O

4.5.6 Rebuild flush regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

4.5.7 Replace high-pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

4.5.8 Change drive gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4.6 Service the cylinder supply modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

4.6.1 Tightening procedure for high-pressure tube fittings . . . . . . . . . . . . . . . . . . . . . . 4-16

4.6.2 Replace primary regulator module (complete replacement) . . . . . . . . . . . . . . . 4-16

4.6.3 Replace cylinder inlet filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

4.6.4 Replace cylinder check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

4.6.5 Replace 4th- and 5th-gas cylinder supply module . . . . . . . . . . . . . . . . . . . . . . . 4-18

power outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

2

1006-0452-000 09/06 4-1

Aestiva Anesthesia Machine

4.7 Service pipeline and cylinder pressure gauges 4-19

4.7.1 Remove gauge panel 4-19

4.7.2 Replace pipeline or cylinder pressure gauges 4-20

4.8 Replace system switch assembly 4-21

4.9 Service the flowmeter module 4-24

4.9.1 Remove front flowmeter panel shield 4-24

4.9.2 Remove flowtubes for cleaning or replacement 4-25

4.9.3 Remove complete flowmeter head 4-26

4.9.4 Replace flowmeter modules 4-28

4.9.5 Replace flowmeter frame 4-32

4.9.6 Replace O2 supply switch 4-33

4.9.7 Checkout procedure for O2 supply switch 4-34

4.9.8 Replace secondary regulator manifold or balance regulator manifold 4-35

4.9.9 Replace O2 or N2O needle valves 4-36

4.9.10 Replace 3rd or 4th gas needle valves 4-38

4.10 Service vaporizer manifold parts 4-39

4.10.1 Repair manifold port valve 4-39

4.10.2 Checkout procedure for manifold port valve 4-40

4.10.3 Replace vaporizer manifold check valve 4-41

4.10.4 Replace vaporizer pressure relief valve 4-43

4.10.5 Replace vaporizer manifold (complete replacement) 4-44

4.11 Service common gas manifold 4-45

4.11.1 Replace common gas manifold 4-45

4.11.2 Replace common gas manifold check valve 4-46

4.11.3 Replace O2 flush switch 4-47

4.12 Service the breathing system 4-48

4.12.1 Replace control panel cover 4-48

4.12.2 Replace control panel microswitch 4-49

4.12.3 Replace Bag-to-Vent toggle or microswitch 4-50

4.12.4 Replace adjustable pressure limiting (APL) knob assembly 4-55

4.12.5 Replace APL disc or cage 4-57

4.12.6 Replace airway pressure gauge 4-58

4.12.7 Remove or replace canister and dishes 4-59

4.12.8 Replace breathing system canister release handle and release
mechanism 4-59

4.12.9 Replace canister microswitch 4-60

4.12.10 Remove the front and rear subfloors and the bulkhead cover 4-61

4.12.11 Replace circuit module identification printed circuit board (ID PCB) 4-62

4.12.12 Replace common gas outlet (CGO) assembly 4-63

4.12.13 Remove the bulkhead 4-63

4.12.14 Replace ACGO or ACGO microswitch 4-64

4.12.15 Disassemble ACGO to replace seals 4-65

4.12.16 Replace sensor interface board (SIB) 4-67

4-2 09/06 1006-0452-000

4 Repair Procedures

4.13 CO2 Bypass repair procedures 4-69

4.13.1 Disassembly 4-69

4.13.2 Replacement Procedure 4-70

4.13.3 Assembly 4-70

4.14 Service the breathing system with an articulating arm 4-75

4.14.1 Removing the rear panel 4-75

4.14.2 Latch adjustment 4-75

4.14.3 Check/adjust tension of absorber arm 4-75

4.15 Remove or replace drawer slides 4-76

4.15.1 Replace drawer lock assembly 4-77

4.15.2 Remove or replace lower shelves 4-78

4.15.3 Replace side panel for drawer enclosure 4-78

4.16 Replace O2 Flush components 4-79

4.16.1 Replace O2 flush button 4-79

4.16.2 Replace O2 flush valve block 4-80

4.17 Replace auxiliary flowmeter or suction regulator 4-81

4.18 Repair or replace display arm 4-82

4.19 Display mount adjustment 4-84

4.19.1 Standard mount 4-84

4.19.2 Heavy duty mount 4-84

4.20 Replace Front Casters 4-86

4.21 Replace Back Casters 4-88

4.22 Replace flip-up shelf 4-89

4.23 Replace light package bulbs or panel 4-90

1006-0452-000 09/06 4-3

Aestiva Anesthesia Machine

w WARNING To prevent fires:

Note

• Use lubricants approved for anesthesia or O

equipment, such as

2

Krytox.

• Do not use lubricants that contain oil or grease. They burn or explode
in high O2 concentrations.

• All covers used on the system must be made from antistatic
(conductive) materials. Static electricity can cause fires.

Obey infection control and safety procedures. Used equipment may
contain blood and body fluids.

After repairs are completed, always perform the checkout procedure.
Refer to Section 3 of this manual.

All pictures and illustrations shown in Section 4 are from a left-hand machine.
Orientation of pneumatic connections are reversed (rotated 180°) for right­hand machines.

4-4 09/06 1006-0452-000

4.1 Servicing the ventilator

The Aestiva Anesthesia Machine can be configured with either of two
ventilators — the Aestiva 7900 SmartVent and the Aestiva 7100 Ventilator.

Service information for these ventilator is provided in separate service
manuals as detailed in Section 1.2.2.

Ventilator components are located in four areas of the Aestiva machine.

• The Display/Control module.

• The Electrical Enclosure located behind the AC Inlet module.

• The Vent Engine Housing located in the rear portion of the Breathing System.

• The sensor interface (SIB—7900, MIA—7100) located under the rear

subfloor of the Breathing System.

Common machine components such as switches and sensors which provide
input to the ventilator and other Breathing System components that are
common to both ventilators are covered in this manual.

The following components are associated with a particular ventilator and are
covered in their respective service manuals.

4 Repair Procedures

Vent CPU For the 7900 Ventilator the CPU board is located in the Electrical Enclosure.

For the 7100 Ventilator the CPU is part of the Control Board located in the
Control Module.

Vent power supply For the 7900 Ventilator the power supply and its related components are

located in the Electrical Enclosure.

For the 7100 Ventilator the power supply is located in the Control Module.

Display/Control Module The Display/Control Module is specific to each ventilator. Refer to the

respective service manual for details.

Vent Engine The Vent Engine is specific to each ventilator. Refer to the respective service

manual for details.

SIB/MIA The Sensor Interface Board (SIB) for the Aestiva 7900 Ventilator and the

comparable assembly, the Monitoring Interface Assembly (MIA), for the
Aestiva 7100 Ventilator are located in the Breathing System. With a few
exceptions, the Breathing System components that interface with these
assemblies are identical for each ventilator.

For the current revision levels of the service manuals, the replacement
procedure for the 7900 SIB is covered in this manual (Section 4.12.16). The
replacement procedure for the 7100 MIA is covered in the Aestiva 7100
Ventilator service manual.

Serial Adapter Board For the 7100 Ventilator, the SAB is located in the Electrical Enclosure.

For the 7900 Ventilator, the serial data input/output functions are located on
the CPU board.

1006-0452-000 09/06 4-5

Aestiva Anesthesia Machine

4.2 How to bleed gas pressure from the machine

Before disconnecting any pneumatic fitting, bleed all gas pressure from the
machine.

1. Set the system switch to On.

2. Close all cylinder valves.

NNNNooootttteeee:::: If pipeline O

is not available, open the O2 cylinder valve.

2

3. Disconnect all pipeline supplies (except for O

4. Disconnect all pipeline supplies (except for O

machine.

5. Bleed all gas pressures from the machine:

a. Turn the flow controls for all gases (except O

b. Disconnect the O

machine (or close the O

c. Press the O

pipeline supply from the source and from the

2

cylinder valve).

2

flush button to bleed O2 from the system.

2

Pipeline Hoses
Disconnected

6. Set the system switch to Standby.

) from the source.

2

) from the rear of the

2

) counterclockwise.

2

4.3 How to remove the rear panel

You must remove the rear panel to repair or replace many of the machine gas
supply components. Before removing the rear panel,

1. Bleed all gas pressure from the machine (Section 4.2).

2. Ensure that all cylinder and pipeline gauges read zero before proceeding.

3. Disconnect all electrical cables.

4. Remove all cylinders.

5. Remove the tee handles.

4-6 09/06 1006-0452-000

4 Repair Procedures

6. Remove the screws from the rear panel.

Screws
Qty (5)

7. Remove the rear panel.

8. To reinstall the rear panel, perform the previous steps in reverse order.

Note: Before installing the rear panel, check the seals around the cylinder yokes.

Replace any seal that is torn or cracked.

4.4 How to remove the side panels

There are clip springs in the rear frame uprights. To remove a side panel, you
must move the panel towards the rear. Then you can pull the panel out of the
front frame uprights.

1. Slide the side panel towards the rear.

2. Carefully insert a nonmetallic flat blade tool into the notch at the front side

of the panel. A nonmetallic tool is recommended to prevent damage to the
painted surface of the panel.

3. Pull the side panel from the frame.

1006-0452-000 09/06 4-7

Aestiva Anesthesia Machine

4.5 Service the pipeline inlet (pneumatic) manifold

Note Newer machine variants include individual pipeline inlet manifolds in place of

the single pneumatic manifold used in previous production machines.
Additionally, the common gas manifold has been redesigned and the
secondary regulator has been eliminated.

4.5.1 Remove pneumatic manifold

Individual
Pipeline Inlet Manifolds

You can move the pneumatic manifold, or the pipeline inlet assembly, to gain
a less restricted access to its components by temporarily removing its
mounting screws and in some cases its standoffs.

1. Remove the rear panel (Section 4.3).

2. Remove the four screws that hold the manifold assembly standoffs to the
frame member (from below).

Pneumatic
Manifold

Standoffs

3. Pull the manifold assembly toward you. This frees (but does not totally
remove) the pneumatic manifold to allow access to the front of the
manifold.

4. For a less restricted access, remove the standoffs.

Replace pneumatic manifold or

a pipeline inlet

4-8 09/06 1006-0452-000

To replace an individual pipeline inlet manifold:

Refer to Section 8.20 to identify parts.

1. Remove the manifold from the assembly.

2. Transfer the gauge adapter, pressure regulator, and pipeline inlet fitting
(with filter and check valve) to the replacement inlet manifold.

3. Reassemble in reverse order.

4 Repair Procedures

4.5.2 Replace pipeline inlet fitting

4.5.3 Replace pipeline

inlet filter

1. Remove the rear panel (Section 4.3).

2. Remove the pipeline inlet fitting.

3. Transfer the o-ring and inlet filter (or install new) to the new inlet fitting.

4. Install the new pipeline inlet fitting.

5. Install the rear panel.

1. Remove the rear panel (Section 4.3).

2. Remove the pipeline inlet fitting (Section 4.5.2).

3. Pull the pipeline inlet filter out of the fitting. The o-ring should come out with
the filter.

4. Install the new pipeline inlet filter in the pipeline inlet fitting. The new filter
comes with an o-ring.

5. Install the pipeline inlet fitting.

6. Install the rear panel.

1006-0452-000 09/06 4-9

Aestiva Anesthesia Machine

4.5.4 Replace pipeline inlet check valve

1. Remove the rear panel (Section 4.3).

2. From the front of the machine, remove the panel under the vaporizer
manifold.

3. Remove the pipeline inlet fitting (Section 4.5.2).

4. The back of the pneumatic manifold has a tube connection for each inlet
fitting. Find and remove the tube directly in line with the check valve that is
being serviced.

The individual O

or Air inlet manifolds include a drive gas connection at the

2

back of the manifold. Remove the drive gas tube or plug to access the
check valve.

5. From the back of the manifold, use a thin tool to push out the check valve.
(For an individual N

O manifold, you will have to carefully apply pressure at

2

the outlet of the manifold — with a syringe for example — to gently force the
check valve out of the manifold,)

6. Push the new check valve into the opening, using the same thin tool. The
new check valve includes an o-ring — orient it toward the pipeline inlet.
Note: Make sure to push the new check valve all the way back into the
opening until it bottoms out on the shoulder.

7. To assemble:

a. Reconnect the tube to the pneumatic manifold (pull on the tube to

ensure that it is locked into the fitting).

b. Install the pipeline inlet fitting.

c. Install the rear panel.

8. Perform the checkout procedure (Section 3).

4-10 09/06 1006-0452-000

4 Repair Procedures

4.5.5 Replace pneumatic
power outlet

O

2

1. Remove the rear panel (Section 4.3).

2. Remove the O

power outlet fitting.

2

3. To assemble:

a. For DISS fittings, apply teflon tape to the threads of the O

outlet fitting.

Countersunk Holes Bracket

Adapter

Tape

power

2

Nut

DISS Outlet

For ISO fittings, do not use teflon tape. Use a bonded seal instead.

Replace as necessary.

Countersunk Holes Bracket

Bonded seal

b. Install the new O

Adapter

ISO (Anatrir) Outlet

power outlet fitting.

2

4. Install the rear panel.

Nut

5. Perform the checkout procedure (Section 3).

1006-0452-000 09/06 4-11

Aestiva Anesthesia Machine

4.5.6 Rebuild flush regulator

1. Remove the rear panel (Section 4.3).

2. Remove the pneumatic manifold (Section 4.5.1).

3. Loosen the nut and turn the regulator adjustment screw counterclockwise
to remove pressure from the spring.

.

Nut

Adjustment
Screw

4. Remove the screws and disassemble the regulator.

Qty 4

Valve

5. Use a socket wrench to remove the regulator cartridge.

6. Check the condition of the o-ring on the valve body. Replace the o-ring if it
is torn or cracked (lubricate sparingly with Krytox).

4-12 09/06 1006-0452-000

To reassemble 1. Install the valve body into the manifold.

2. Assemble the housing components into the housing.

Housing Diaphragm Plate

Centering Stem

Detent

4 Repair Procedures

3. Back out the adjustment screw to release spring pressure.

4. Install the housing loosely onto the manifold. Finger tighten the four
mounting screws and then back off each screw one full turn.

5. Turn in the adjustment screw until the diaphragm plate just engages the
valve stem (to the point where you first start to feel increased resistance)
and then turn the screw in (tighten) one full turn.

6. Rotate the housing in a circular motion to ensure that the valve stem comes
to rest in the centering detent of the diaphragm plate.

7. Using a x-cross pattern, securely tighten the regulator housing mounting
screws.

Adjust the regulator output 1. As an initial adjustment, turn the adjustment screw in four turns after it

starts to compress the spring.

2. Check the output of the regulator (Section 6.5). Adjust if necessary.

3. Install the rear panel.

4. Perform the checkout procedure (Section 3).

1006-0452-000 09/06 4-13

Aestiva Anesthesia Machine

N2O

O

4.5.7 Replace high-

pressure relief valve

2

1. Remove the rear panel (Section 4.3).

2. Remove the high-pressure relief valve.

3. Install the new high-pressure relief valve.

Pneumatic manifold

Individual pipeline inlets

• Ensure the new valve includes an o-ring.

Air

CO

2

Heliox
4th Gas
5th Gas

O

2

N2O Air

4. Install the rear panel.

5. Perform the checkout procedure (Section 3).

4-14 09/06 1006-0452-000

4 Repair Procedures

4.5.8 Change drive gas w CAUTION: If you change the drive gas, you must also change the

drive gas selection on the ventilator service setup screen. Refer to
Section 4 of the respective ventilator service manual. If the drive gas
selection and the actual drive gas do not agree, volumes will not be
correct.

is the only monitored gas supply pressure. If Air is selected as the

O

2

drive gas for the ventilator, there will be no specific alarm for loss of air
supply. Performance alarms will still function.

1. Remove the rear panel (Section 4.3).

2. Remove the pneumatic manifold (Section 4.5.1).

Drive gas connection for
individual pipeline manifold

Note: The pneumatic manifold has a connection for each drive gas marked “O

Vent” or “Air Vent.” (The drive gas connection at the back of an individual
pipeline manifold is not marked.) The connection not in use is blocked with a
plug.

3. Remove the plug from the new connection.

View from Front (O2 shown as drive gas)

Air Vent

4. Disconnect the drive gas hose from the present connection.

5. Install the plug in this connection (pull on the plug to ensure that it is locked
into the fitting).

6. Reroute the drive gas hose so that it does not cause kinks in other tubing.

O2 Vent

O2 DriveAir Drive (equivalent)

2

7. Connect the drive gas hose to the new connection (pull on the hose
connector to ensure that it is locked into the fitting).

8. Do a high pressure leak test BEFORE you install the pneumatic manifold
and the rear panel.

9. Enter the service mode and select the correct drive gas.

10.Test the primary regulator. Verify that it functions within specifications now
that it will be supplying drive gas to the ventilator (Section 6.1).

11. To assemble:

a. Install the pneumatic manifold.

b. Install the rear panel.

12. Perform the checkout procedure (Section 3).

1006-0452-000 09/06 4-15

Aestiva Anesthesia Machine

4.6 Service the cylinder supply modules

4.6.1 Tightening

procedure for high-

pressure tube fittings

Note If you are installing a new tube that has not been tightened before, tighten the

4.6.2 Replace primary
regulator module

(complete replacement)

The cylinder pressure gauge is connected to the cylinder supply through a
copper tube with fittings at both ends. Use the following tightening procedure
whenever you are replacing a cylinder supply or a cylinder pressure gauge.

1. Insert the tubing into the fitting until the ferrule seats in the fitting.

2. Tighten the nut by hand.

3. Continue tightening the nut with a wrench until it reaches the original
position (about 1/4 turn). You will feel an increase in resistance at the
original position.

4. After reaching the original position, tighten the nut just slightly.

nut 3/4 turns with a wrench after the nut is finger tight.

1. Remove the rear panel (Section 4.3).

2. Disconnect the cylinder pressure gauge fitting.

3. Remove the three mounting screws and lock washers.

4. Disconnect all other fittings.

5. To reassemble, perform the previous steps in reverse order.

• Tighten the high-pressure fitting as detailed in Section 4.6.1

• Pull on the cylinder output fitting to ensure it is locked in place.

6. Check the output of the regulator BEFORE you install the rear panel. Adjust
if necessary (Section 6.1).

7. Perform the checkout procedure (Section 3).

4-16 09/06 1006-0452-000

4 Repair Procedures

4.6.3 Replace cylinder inlet filter

1. Open the cylinder yokes.

2. Remove the inlet adapter from the cylinder yoke, using a 4 mm hex wrench.

Note: A brass retaining ring keeps the filter inside the inlet adapter.

3. Thread a 6-mm screw into the brass retaining ring and pull it out.

w CAUTION Make sure to screw the 6-mm screw in two turns only. Do not crush the

4.6.4 Replace cylinder check valve

filter.

4. Remove the filter.

5. Install the new filter and brass retaining ring.

6. Install the inlet adapter in the cylinder yoke.

7. Perform the checkout procedure (Section 3).

The cylinder check valve is not a replaceable item. If the check valve is
defective, you must replace the complete cylinder supply module.

For instructions, see Section 4.6.2.

1006-0452-000 09/06 4-17

Aestiva Anesthesia Machine

4.6.5 Replace 4th- and
5th-gas cylinder supply

module

1. Bleed all gas pressure from the machine (Section 4.2).

2. Ensure that all cylinder and pipeline gauges read zero before proceeding.

3. Remove the gas manifold cover (two screws from bottom of mounting
plate.

4. Disconnect the cylinder pressure gauge fitting.

5. Disconnect the output tube fitting.

6. Remove the three mounting screws and lock washers.

Pressure gauge fitting

7. To reassemble, perform the previous steps in reverse order.

• Tighten the high-pressure fitting as detailed in Section 4.6.1

• Pull on the cylinder output fitting to ensure it is locked in place.

8. Check the output of the regulator BEFORE you install the manifold cover.

Adjust if necessary (Section 6.1).

9. Perform the checkout procedure (Section 3).

4-18 09/06 1006-0452-000

4.7 Service pipeline and cylinder pressure gauges

4 Repair Procedures

4.7.1 Remove gauge panel

1. Remove the end caps from both sides of the gauge panel (2 screws for each
side).

2. Remove the vinyl seals from the top and bottom of the gauge panel (slide
out). Note the position of the seals for proper reinstallation later.

Qty 2

3. Pull the panel toward you. The system switch stays connected.

4. To reassemble, perform the previous steps in reverse order.

Note: To prevent damage to a vinyl seal, keep the seal aligned with the
mating groove in the aluminum extrusion. Then slowly insert.

5. Perform the checkout procedure (Section 3).

1006-0452-000 09/06 4-19

Aestiva Anesthesia Machine

4.7.2 Replace pipeline or cylinder pressure gauges

Pry

Pull

1. Bleed all gas pressure from the machine (Section 4.2).

2. Ensure that all cylinder and pipeline gauges read zero before proceeding.

3. Remove the gauge panel (Section 4.7.1).

4. Remove the gauge label (cover):

a. Look for an indentation toward the top right side of the gauge’s plastic

cover.

b. Put a thin tool in the indentation between the plastic cover and the

metal frame.

c. Lever the cover out.

5. Use a needle nose pliers to grab the gauge at the gap in the collar. Pull the
gauge toward you (the gauge is held tightly; pull hard).

6. Disconnect the tube from the gauge.

• Cylinder (high-pressure) gauges have copper tubing.

• Pipeline (low-pressure) gauges have flexible nylon tubing.

7. To install the new gauge:

a. Connect the tube on the new gauge.

• For cylinder gauges, tighten the high-pressure fitting as detailed in
Section 4.6.1.

• For pipeline gauges, pull on the tube to ensure that it is locked in
place.

b. Align the gauge on the panel and push it into place.

c. Install the gauge label.

w CAUTION If installing multiple gauges, make sure to install the correct label for

each gauge. The color ID front plate indicates the type of gas supply.

Note

Low-pressure gauges for O2, N2O, and Air, and high-pressure gauges for
Heliox and CO
respective flowmeter module.

High-pressure gauges for O
supply modules and are mounted in order next to the system switch.

8. Install the gauge panel (Section 4.7.1).

9. Perform the checkout procedure (Section 3).

follow the order of the flowhead and are mounted under the

2

, N2O, and Air follow the order of the cylinder

2

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