Weinmann WM 22800 Service Manual
Servicing and
repair instructions
MEDUMAT Standard a
Ventilator
WM 22800
Contents
Introduction
1.
Overview
1.1
2.
Description of ventilator
2.1
2.2
2.3
2.4
2.5
2.6
3.
Final Check
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
4.
Servicing
4.1
4.2
4.3
4.4
4.5
5.
Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Symbols used on the ventilator
Uses
. . . . . . . . . . . . . . . . . . . . . . . . . 6
Ventilation function
Controlled ventilation
Assisted ventilation
Checking course of ventilation
Patient valve
. . . . . . . . . . . . . . . . . . . . . . . . . . 9
Test resources required
Preparations for final check
Entering device data
Testing for leaks and checking pressure
reading . . . . . . . . . . . . . . . . . . . . . .
Device self-test after switching on
Functional check on alarms
Checking assisted ventilation
Functional check on frequency setting
Functional check on
4.5 bar delivery pressure and 10 mbar
counterpressure . . . . . . . . . . . . . . . . .
Checking oxygen concentration
Functional check on pressure limit
Functional check on exhaust valve
without patient valve . . . . . . . . . . . . . .
Checking equipment and accessories
(system components) . . . . . . . . . . . . . .
Checking external condition
Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Intervals and Scope
Batteries and fuses
Adjusting the pressure gauge
Storage
Disposal
. . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . 5
. . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . 7
. . . . . . . . 8
. . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . 9
. . . . . . . . . . 9
. . . . . . . . . . . . . . 9
10
. . . . . 10
. . . . . . . . . 11
. . . . . . . 12
. . 12
tidal volume at
. . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . 17
13
. . . . . . 14
. . . . 14
14
15
. . . . . . . . 15
. . . . . . . 17
6.
Repair information and repair instructions
6.1
General
6.2
Replacing the sieve in the compressed
gas connection . . . . . . . . . . . . . . . . .
6.3
Changing the foam insert in the pressure
relief valve outlet . . . . . . . . . . . . . . . .
6.4
Opening the
6.5
Closing the
6.6
Changing the batteries
6.7
Replacing the fuse
6.8
Replacing the alarm signalling device
6.9 Replacing the potentiometer
(for setting pressure or frequency) . . . . .26
6.10 Calibration after removal of PCB or
Pot 28 (frequency) . . . . . . . . . . . . . . .28
6.11 Replacing the circuit board . . . . . . . . . 29
6.12 Replacing the pressure gauge . . . . . . . 31
6.13 Replacing the pneumatic block . . . . . . 32
6.14 Replacing the pneumatic block with
angled outlet . . . . . . . . . . . . . . . . . . .34
6.15 Changing the Air Mix/
7. Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . 44
8. Tools and test equipment . . . . . . . . . . . . . . . 48
9. Technical data . . . . . . . . . . . . . . . . . . . . . . . 50
10. Technical Changes . . . . . . . . . . . . . . . . . . . . 52
11. Repair and inspection log . . . . . . . . . . . . . . 53
No Air Mix switch . . . . . . . . . . . . . . .37
6.16 Replacing the upper housing section. . . 38
6.17 Replacing the housing base section . . . 43
7.1 List of spare parts . . . . . . . . . . . . . . . 44
7.2 Maintenance set. . . . . . . . . . . . . . . . 46
8.1 General tools. . . . . . . . . . . . . . . . . . 48
8.2 Special tools . . . . . . . . . . . . . . . . . . 48
8.3 Test equipment . . . . . . . . . . . . . . . . . 49
9.1 Pneumatics . . . . . . . . . . . . . . . . . . . 51
9.2 O2 content when using Air Mix. . . . . . 52
. . . . . . . . . . . . . . . . . . . . . 22
device
. . . . . . . . . . . . . 23
device
. . . . . . . . . . . . . . 24
. . . . . . . . . . . 24
. . . . . . . . . . . . . . . 25
. . 22
22
23
. . 25
© Copyright Weinmann GmbH & Co. KG.
The content and presentation are copyright protected and may only be used by authorised Weinmann Service Partners in the
course of their service operations. The content must not be reproduced or passed on to third parties. The complete documents
must be returned on termination of the cooperation with Weinmann.
2
Introduction
For decades, Weinmann has developed, manufactured and distributed equipment for emergency
medicine, oxygen therapy and inhalation therapy.
In 1972, Weinmann introduced the first
MEDUMAT emergency ventilator to the market.
MEDUMAT emergency ventilators are automatic
resuscitators. They are used for controlled respiration in emergency medicine, e.g. in the event of
acute ventilatory disorders, and for secondary obstructions.
The new generation of equipment, which was
especially developed to meet the requirements of
users and launched on the market in 1997, offers
users and patients an enhanced level of safety. An
intelligent alarm system monitors the patient's breathing and notifies the user of any malfunctions.
Hence, this technology offers even greater safety
and reliability during respiration.
The aim of these service and repair instructions is
to familiarise you, as a knowledgeable expert, with
the MEDUMAT in terms of function, technology
and repairs. In conjunction with the training you
have already received from Weinmann, you are
now a "trained, qualified expert" and are able to
instruct your clients correctly, rectify faults yourself,
and perform the functional checks described in the
instructions for use, as well as conduct any repairs
which may be necessary, as outlined in these service and repair instructions.
In the event of a guarantee claim, MEDUMAT should
be returned to Weinmann.
To enable us to process any guarantee or goodwill
claims, please return the consumer's proof of
purchase (invoice) together with the device.
Repairs and maintenance work must be carried out
only by Weinmann or by knowledgeable experts.
You are responsible for all repairs performed by
yourself and the warranty thereof!
Only original Weinmann spare parts should be used
for repair purposes.
Please remember:
Your customer trusts you and relies on your expertise, just as you rely on Weinmann.
Note:
The following information can be found in the description and operating instructions for MEDUMAT Standard a:
• Safety instructions:
See chapter 2.
• Mounting with the wall bracket STATION MEDUMAT,
Mounting of accessories:
See chapter 3.
• Operation of the MEDUMAT emergency ventilator:
See chapter 4.
• Hygienic preparation:
See chapter 5.
• Functional check:
See chapter 6.
Introduction 3
1. Overview
Control panel MEDUMAT Standard a
1 Ventilation pressure gauge
(Manometer
10 Max. ventilation pressure regulator
3 Alarm acknowledgement2 Alarm panel
4 Air Mix/No Air Mix switch
5 Minute volume regulator
6 ON/OFF switch
assisted ventilation
7 Colour code
8 Ventilation frequency regulator
9 ON/OFF switch
MEDUMAT Standard a connections
11 Pressure gas connection
13
O/I
up to appliance no. 1669 from appliance no. 1669
14
O/I
12 Catch for STATION MEDUMAT
wall mounting
13 Connection for ventilation hose
14 Pressure gauge hose connection
15 Relief valve
16 Dust cover
17 Mixed air filter
12 Catch for STATION MEDUMAT
wall mounting
4 Overview
1.1 Symbols used on the ventilator
Inlet 2,7 - 6 bar O2.
MEDUMAT Standard a device information plate
SN
Serial number of device
Year of manufacture
Do not dispose of device in domestic waste.
Safety check and servicing label
Servicing label: indicates when the next service is due.
Safety check label (in Germany only): marks when the next safety check as per §6 of the
German law relating to users of medical devices is required.
Overview 5
2. Description of ventilator
2.1 Uses
MEDUMAT Standard a is an automatic (short-term) ventilator.
You can use MEDUMAT Standard a:
• to revive patients at the site of an emergency
• on a longer term basis in more protracted
emergencies, e.g. fires.
You can use MEDUMAT Standard a whilst transporting patients:
• between the various rooms and departments
of a hospital;
• between the hospital and other premises;
• in emergencies;
• when transport over a considerable distance is
planned.
2.2 Ventilation function
MEDUMAT Standard a operates within a pressure
range of 2.7 to 6 bar and at a flow rate of not less
than 70 l/min O2. It has a built-in power pack.
MEDUMAT Standard a:
• is used for controlled ventilation of persons
with a body weight of about 10 kg upward,
or for assisted ventilation from about 15 kg
body weight;
• is used to treat respiratory arrest;
• can be preset to parameters that ensure evenly
balanced ventilation provided that the selected
maximum ventilation pressure P
ceeded;
• can be supplied with additional modules for
aspiration and oxygen inhalation. (N.B.
MEDUMAT Standard a cannot be used as a
ventilator simultaneously with these modules)
is not ex-
max
The gas used for ventilation is highly compressed
medical oxygen, which is reduced to the required
operating pressure by a two-stage external pressure reducer. The oxygen supply is fed in at input
valve 11.
The continuously variable ventilation frequency
and the inspiration/expiration ratio of 1:1.67 for
controlled ventilation are controlled by electronic
control routines within the device.
Regardless of the ventilation mode selected, the
patient is free to use the patient valve to take a
spontaneous breath between ventilation cycles. In
that case the patient draws the air for breathing
from the surroundings.
The gas for inspiration flows along the hose and
through the patient valve and either the mask or the
tracheal tube into the patient’s airways. The patient
valve is fitted with a lip membrane that enables expired gas to be conducted away through the expiration tube.
11
6 Description of ventilator
At the normal Air Mix setting, atmospheric air is admixed to give an O2-concentration of between
55% and 85% at 10 mbar ventilation pressure
(see „9.2 O2 content when using Air Mix“ on
page 52).
In certain indications and in cases where the surrounding atmosphere is contaminated, you can
switch to No Air Mix and ventilate with pure oxygen.
The injector unit is switched off when switching
from Air Mix to No Air Mix. This increases minute
volume which can result in the set pressure limit being exceeded and a stenosis alarm (Stenosis) being
triggered. In this case, set minute volume correspondingly lower.
In the opposite instance, in other words when
switching from No Air Mix to Air Mix, the injector
unit is switched on. This reduces minute volume
which can lead to the set pressure limit being un-
dershot. In this case, set minute volume correspond-
ingly higher.
Air Mix
No Air Mix
O/I
Air Mix
No Air Mix
O/I
2.3 Controlled ventilation
After switching on, MEDUMAT Standard a is automatically in the controlled ventilation mode. This
means that the intubated patient receives mandatory
ventilation cycles which depend on the ventilation
values set on the device.
Mandatory ventilation cycle: it is not the patient, but
the device which determines the time of the next
breath.
2.4 Assisted ventilation
In addition to the controlled ventilation mode the
MEDUMAT Standard a provides an assisted
ventilation mode.
Once you switch on the assisted ventilation mode
by pressing the Assist button, a green LED flashes
to indicate that this mode is operating.
Triggered ventilation cycle: the patient can trigger a
ventilation cycle by making an effort to breathe.
Description of ventilator 7
Within a time window of 40 % of expiration, the
patient can now start a triggered ventilation cycle.
To do this the patient must create a flow of at least
5 l/min by making their own efforts to breathe.
If the patient’s efforts to breathe are not sufficient to
trigger a cycle, the patient automatically receives
a mandatory ventilation cycle at the end of the time
window, thereby ensuring compliance with the set
minute ventilation.
This function allows the device ventilation cycles to
be synchronised with the patient’s own efforts to
breathe.
Between mandatory ventilation cycles the patient
has the opportunity to breathe ambient air via the
patient valve.
If the patient does not trigger the device, an alarm
is set off. The patient then receives controlled ventilation.
IPPV: Intermittent Positive Pressure Ventilation
(= controlled ventilation).
2.5 Checking course of ventilation
You can check the course of the ventilation on pressure gauge 1.
2.6 Patient valve
The gas for inspiration is channelled into the patient’s airways through the patient valve.
The patient valve is designed so that even in the
event of failure of the MEDUMAT Standard a,
spontaneous breathing is possible regardless of
which ventilation mode you selected.
1
Lip membrane
8 Description of ventilator
Diaphragm for
expiration arm
Diaphragm for
spontaneous
breathing arm
3. Final Check
After any repair and maintenance work, the device
must be subjected to the following final check in
accordance with the Test Instructions WM 22805
and Test Record.
Note:
For a final check on the MEDUMAT Standard a
you must connect the respiration tube and the patient valve.
If the final check reveals any faults or deviations
from the specified values, you must not use the
MEDUMAT Standard a.
We recommend you to keep the following parts in
stock:
• Replacement seals for device connections;
• Replacement dust filter;
• Lip diaphragm for patient valve;
• Diaphragm for spontaneous breathing arm;
• Diaphragm for expiration arm;
• O-ring 1145/118.
3.1 Test resources required
• Oxygen concentration measuring device,Type Oxycontrol WM 13550
• Volumetric flowmeter, Type RT 200 (Timeter) or Type EKU VIP – Ventilator
• Functional check test set WM 15382
• Adjustable orifice, e.g. ball valve, internal diameter ≥ 10 mm
• Set: hose with injector WM 15359
• Pressure gauge 0 - 6.3 bar, class 1.6
• Pressure gauge 0 - 100 mbar, class 1.6
• Set, supply test Medumat / Modules WM 15440
3.2 Preparations for final check
1. Connect MEDUMAT Standard a to test equipment.
2. Set MEDUMAT Standard a with switch in position No Air Mix to Freq. = 40 min-1, MV = 5 l/min and
P
= 60 mbar.
max
3.3 Entering device data
• Enter the device type, device number and date of manufacture in the Test Record.
Final Check 9
3.4 Testing for leaks and checking pressure reading
3.4.1 Testing for leaks on the inlet side
• With device switched off, apply pressure of 6 bar to inlet side and shut off outlet pressure.
• Set lever to No Air Mix.
Requirement: The pressure drop must be less than 0.2 bar/min.
• Set lever to Air Mix.
Requirement: The pressure drop must be less than 0.2 bar/min.
3.4.2 Testing for leaks in pressure measurement segment
• Apply pressure of 60 mbar to pressure measurement segment of Medumat.
• During the measurement, a traction force of approx. 3 N must be applied manually to the elbow outlet.
Requirement: The pressure drop must be less than 2 mbar/min.
3.4.3 Checking pressure reading
1. Attach T-connector with injector (WM 15359)
to pressure measurement connection 14.
2. Connect test pressure gauge 0 - 100 mbar or
Timeter to free end of T-connector (pressure
gauge/volumetric flowmeter not supplied with
device).
3. Use injector to create a pressure of 55 mbar
as shown on the test pressure gauge.
Requirement: Respiration pressure reading must not
deviate from set value by more than ≤≤≤≤ 1.5 mbar.
3.5 Device self-test after switching on
Pressure gauge
O/I
Test pressure
gauge
:
SN :
:
p
y
T
14
Injector
1. Apply approx. 4.5 bar to the inlet.
2. Switch on MEDUMAT Standard a.
Requirement: The self-test is activated: all 6 LEDs light up together and a brief signal tone sounds.
10 Final Check
3.6 Functional check on alarms
3.6.1 Stenosis alarm check up to appliance no. 1799
• Set MEDUMAT Standard a to the Air Mix setting at f = 40/min, MV = 3 l/min and p
= 60 mbar.
max
Close patient valve outlet.
Note: Over-response of needle is normal.
Requirement: The stenosis alarm must be activated after two respiration cycles.
• Set MEDUMAT Standard a to the No Air Mix setting at f = 40/min, MV = 3 l/min and p
= 60 mbar.
max
Close patient valve outlet.
Note: Over-response of needle is normal.
Requirement: The stenosis alarm must be activated after two respiration cycles.
3.6.2 Stenosis alarm check from appliance no. 1800
• Set MEDUMAT Standard a to the Air Mix setting at f = 40/min, MV = 3 l/min and p
Close patient valve outlet.
Note: Over-response of needle is normal.
MEDUMAT Standard a briefly switches to expiration if the maximum ventilation pressure is exceeded,
but then tries to continue inspiration in the same inspiration phase.
If the maximum ventilation pressure is exceeded for a second time during the same inspiration phase,
the unit finally switches to expiration and vents the patient tube system completely. The next inspiration
begins with the following ventilation stroke according to the frequency selected.
Requirement: The stenosis alarm must be activated after two respiration cycles.
• Set MEDUMAT Standard a to the No Air Mix setting at f = 40/min, MV = 3 l/min and p
Close patient valve outlet.
Note: Over-response of needle is normal.
Requirement: The stenosis alarm must be activated after two respiration cycles.
= 60 mbar.
max
= 60 mbar.
max
3.6.3 Alarm acknowledgement check
• Immediately after first alarm tone sounds, press button 3 (alarm acknowledgement).
Requirement: The alarm tone must be suppressed immediately.
3.6.4 Disconnection alarm check
• Open patient valve outlet.
Requirement: The disconnection alarm must be activated after two respiration cycles.
3.6.5 Pressure alarm check
• Shut off pressurised gas connection of Medumat (2.7 - 6.0 bar).
Requirement: The pressure alarm must be activated.
Final Check 11
3.7 Checking assisted ventilation
Connect ventilation tube with patient valve to test bag.
1. Set MEDUMAT Standard a to MV 8 l/min, Air Mix, f = 8 /min and P
= 60 mbar.
max
2. Switch on Assist button 6, green LED in button flashes.
3. Wait for two inspiration phases.
Requirement: The visual alarm No Assist is actuated (flashing yellow light in alarm field 2).
The acoustic alarm does not cut in until one minute has elapsed.
4. Simulate inspiration impulses (negative pressure) by squeezing the test bag several times before the next
inspiration.
During simulation the pointer must swing into the negative sector and reach at least -0.8 mbar.
Requirement: The yellow No Assist LED must go out on inspiration.
3.8 Functional check on frequency setting
Connect respiration tube to 10 mbar orifice and to volumetric flowmeter, then set MEDUMAT Standard a to
MV = 11 l/min
1. Run MEDUMAT Standard a in position No Air Mix, Freq. = 5 min-1.
Requirement: The measured frequency must be 5 ± 1 min
-1
.
2. Run MEDUMAT Standard a in position No Air Mix, Freq. = 15 min-1.
Requirement: The measured frequency must be 15 ± 2 min
-1
.
3. Run MEDUMAT Standard a in position No Air Mix, Freq. = 25 min-1.
Requirement: The measured frequency must be 25 ± 2 min
-1
.
4. Run MEDUMAT Standard a in position No Air Mix, Freq. = 40 min-1.
Requirement: The measured frequency must be 40 ± 2 min.
O/I
Patient valve with
tube system
Volumetric flowmeter
Orifice 10 mbar
open
12 Final Check
3.9 Functional check on tidal volume at 4.5 bar delivery pressure and 10 mbar counterpressure
1. Run MEDUMAT Standard a in position No Air Mix, Freq. = 15 min-1 and MV = 20 l/min.
Requirement: Tidal volume must be 1300 ± 200 ml.
Switch MEDUMAT Standard a to position Air Mix.
Requirement: Tidal volume must be 1300 ± 200 ml.
2. Run MEDUMAT Standard a in position No Air Mix, Freq. = 15 min-1 and MV = 11 l/min.
Requirement: Tidal volume must be 730 ± 110 ml.
Switch MEDUMAT Standard a to position Air Mix.
Requirement: Tidal volume must be 730 ± 110 ml.
3. Run MEDUMAT Standard a in position No Air Mix, Freq. = 40 min-1 and MV = 5 l/min.
Requirement: Tidal volume must be 125 ± 25 ml.
Switch MEDUMAT Standard a to position Air Mix.
Requirement: Tidal volume must be 125 ± 25 ml.
O/I
Patient valve with
tube system
Volumetric flowmeter
Orifice set to
10 mbar
Final Check 13
3.10 Checking oxygen concentration
1. Run MEDUMAT Standard a in position Freq. = 10 min-1 and MV = 11 l/min with 100 % O2.
2. Check O2 concentration in position No Air Mix.
Requirement: The O
3. Check O2 concentration in position Air Mix.
Requirement: The O
concentration must be greater than 98 %.
2
concentration must lie between 50 % and 65 %.
2
3.11 Functional check on pressure limit
1. Connect respiration tube to test bag.
2. Set MEDUMAT Standard a to No Air Mix, Freq. = 8 min-1 and MV = 9 l/min.
3. Set pressure limit to 20 mbar.
Requirement: The pressure limit must respond at 20 ± 5 mbar and trigger the stenosis alarm.
4. Set pressure limit to 60 mbar.
Requirement: The pressure limit must respond at 60 ± 5 mbar and trigger the stenosis alarm.
3.12 Functional check on exhaust valve without patient valve
1. Run MEDUMAT Standard a in position f = 8 min-1 and MV = 7 l/min.
2. Connect patient valve to device outlet with expiration outlet closed, without lip diaphragm and with test
bag.
Requirement: The test bag is completely inflated in one inspiration stroke. The respiration device can then
be heard to exhaust.
14 Final Check
3.13 Checking equipment and accessories (system components)
• Respiration tube with patient valve undamaged and in working order
• Functional check test set in working order
• Pressure reducer in working order
• O2 cylinder within test deadline; valve in working order
• Support plate complete and in working order
• Medical products book present
• Operating instructions present
3.14 Checking external condition
• Check external condition of device.
Requirement: No mechanical damage to housing.
Device labels with operating information are legible.
Sealing sleeves are properly seated.
Pressure gauge zero reading is correct.
Connecting thread G3/8 is undamaged and functions smoothly.
All rotary knobs are self-locking against inadvertent readjustment.
3.15 Documentation
• Document points 4 to 14 in the Test Record, along with test date and tester number.
Final Check 15
4. Servicing
N.B.
Always remember to carry out a technical safety check of the ventilator after every repair.
MEDUMAT Standard a must be serviced regularly.
We recommend having all maintenance work, servicing and repairs carried out either by the manufacturer
Weinmann or by a qualified agent expressly authorised by that company.
4.1 Intervals and Scope
Every 2 years:
Every 2 years, you must subject the device (including patient valve and tube system) to a technical safety check
in accordance with §6 of the Regulations for Users.
The servicing and inspection may also be carried out by the manufacturer Weinmann.
The following points should be observed:
• Check that the equipment is complete
• Visual check for:
– physical or mechanical damage
– correct markings on controls
– damage to all external hoses;
• Replacement of worn components/
compulsory change parts (see “7.2 Maintenance set” on page 46);
• Check of system components: transport platforms, oxygen supply fittings, secretion suction
system, hose connections etc.
• Check test bag.
• Repeat testing of aluminium oxygen bottles
WM 1821 and WM 3621 by the Technical
Testing Association. The specified testing date
is stamped on the shoulder of the bottle;
• Final check in accordance with Test Instructions/
Test Report STK WM 22805
(see “3. Final Check” on page 9 and see “11. Repair and inspection log” on page 53.
Every 4 years:
• Servicing of the fittings in the oxygen supply system (e.g. pressure reducer) either by the manufacturer or
by a qualified agent expressly authorised by him.
Every 10 years:
• Repeat testing of the conventional steel or aluminium oxygen bottles by the Technical Testing Association.
The specified testing date is stamped on the shoulder of the bottle.
16 Servicing
4.2 Batteries and fuses
MEDUMAT Standard a is fitted with two batteries
which must always be changed together:
A button cell CR2430 18 supplies the electronics
with auxiliary power if the capacity of the main
battery 20 is exhausted. This means that an alarm
can still be activated in the event of sudden failure
of the main battery. The device switches to expiration.
As a general rule, the capacities of the batteries
are designed in such a way that under normal usage conditions, they do not need to be changed
during the 2-year servicing intervals. Within the
context of the prescribed 2-year servicing, the batteries are replaced completely.
We recommend that the batteries be changed
only by the manufacturer Weinmann or by authorised specialists explicity authorised by them, since
special precautions must be taken to protect the
electronics (see “6.6 Changing the batteries” on
page 24).
18
19
20
18: Button cell for auxiliary power
19: Fuse to prevent internal short-circuiting
20: Lithium battery 3.6 V for main power to
MEDUMAT Standard a
4.3 Adjusting the pressure gauge
In the idle state, with MEDUMAT Standard a deactivated and the oxygen cylinder closed, the needle of the
pressure gauge must point precisely to “0”.
To adjust the needle, proceed as follows:
1. Carefully lever out the plastic cover of the adjusting screw.
2. Adjust the needle with the adjusting screw
using a small screwdriver (e.g. watchmaker’s
screwdriver).
3. Re-insert the plastic cover.
Adjusting screw
4.4 Storage
If you are not intending to use MEDUMAT Standard a for a long period, we recommend the following storage
precautions:
1. Clean and disinfect the ventilator (see
“5. Hygienic preparation” of the description
and operating instructions for MEDUMAT).
2. Store MEDUMAT Standard a in a dry place.
Important note!
Remember that the ventilator still requires servicing
at the stipulated intervals even when in storage,
otherwise it cannot be used when removed from
storage.
Servicing 17
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