Siemens E382 EH81E 061 01 03 02 User manual

Compressor Compact
Service Manual
E382 EH81E 061 01 03 02

2 Siemens-Elema AB E382 EH81E 061 01 03 02
Compressor Compact
Important
Important
General information
The documentation for the Compressor Compact
consists of:
• Operating Manual
• Service Manual
• Spare Parts List
For proper servicing, the Operating Manual and
the Spare Parts List are indispensable
complements to this Service Manual
Data on pressures in the Compressor Compact
are given in Pa (bar):
1 kPa = 10 mbar 1 mbar = 0 1 kPa
1 kPa = 0 01 bar 1 bar = 100 kPa
1 kPa ≈ 10 cm H2O 1 cm H2O ≈ 0 1 kPa
1 kPa ≈ 0 01 at 1 at ≈ 100 kPa
1 kPa ≈ 0 01 kgf/cm21 kgf/cm2 ≈ 100 kPa
1 kPa ≈ 0 01 kp/cm21 kp/cm2 ≈ 100 kPa
1 kPa ≈ 0 145 psi 1 psi ≈ 6 9 kPa
In addition to the Important information given
here, always pay attention to applicable national
regulations
If not stated otherwise in this manual:
• The 100 V/50 Hz, 100 V/60 Hz and 115 V/60 Hz
versions are refered to as the 115 V version
• The 230 V/50 Hz and 240 V/60 Hz versions are
refered to as the 230 V version
Hazard notices
The Compressor Compact operates from mains
power supply With power connected to the unit,
there are energized electrical components as well
as moving mechanical parts inside the equipment
All personnel must exercise extreme caution when
in the vicinity of this equipment if fault tracing or
adjustments are performed with mains power
supply connected and with the compressor cover
or front panel opened or removed
The Compressor Compact generates compressed
air at a pressure of 400 kPa (4 0 bar) Do not
attempt to connect or disconnect the compressed
air line or service the compressor section while
compressed air is being supplied Do not direct
the compressed air line toward the eyes or directly
onto unprotected skin surfaces
Classification
• Class I equipment
• according to IEC 601-1
Type B
Functional check
After any service intervention in the Compressor
Compact, perform a functional check according to
the instructions in the Operating Manual
Service
Your local Siemens representative supplies the
spare parts indicated in the Spare Parts List
When ordering spare parts, please state the serial
number of the unit
The Compressor Compact is oil free, and oil must
not be used when servicing the compressor
The Compressor Compact must be serviced at
regular intervals as follows:
• 2000 hour overhaul when replacing filters as
described in this Service Manual
• 8000 hour overhaul as described in this Service
Manual
To the responsible service personnel
The contents of this document are not binding If
any significant difference between the product and
this documentation is found, please contact your
local Siemens representative for further
information
We reserve the right to modify products without
amending this document or advising the user
We recommend that only Siemens authorized
personnel should be permitted to service or repair
the Compressor Compact, and that only Siemens-
Elema genuine spare parts should be used
Siemens does not otherwise assume responsibility
for the materials used, the work performed, or any
possible consequences of same

Compressor Compact
E382 EH81E 061 01 03 02 Siemens-Elema AB 3
Page
Important 2
Introduction 4
General 4
Main units 5
Basic principles 6
Description of functions 12
1 Compressor section 12
2 Cooling section 14
3 Dryer section 15
4 Air outlet section 19
5 Control section 20
Disassembling and assembling 22
General 22
Compressor covers 23
Transport safety locks 24
Internal tubing 25
Compressor/motor unit 26
Drive belt 27
Belt pulleys 28
Compressor 29
Thermoelectric cooler 32
Water separator 2 33
Filter solenoid valves 34
Pressure regulator 35
Fan 36
Compressed air reservoir 37
Control section 38
Page
Adjustments 39
Pressure regulator 39
Maintenance 40
General 40
Performing the 2000 hour overhaul 41
Performing the 8000 hour overhaul 42
Troubleshooting 43
Index 47
Circuit and connection diagrams 48
Without standby function 48
With standby function 50
Block diagram 51
Contents

4 Siemens-Elema AB E382 EH81E 061 01 03 02
Compressor Compact
Introduction
Introduction
General
The Compressor Compact is designed to
supply medical-grade compressed air
The compressor has a capacity of approx
40 l/min at a pressure of 400 kPa (4 0 bar)
The Compressor Compact can be placed on
the ventilator cart to form a compact unit
which is easy to move
The Compressor Compact is well insulated
against noise and therefore does not cause
disturbance when used during operations
The Compressor Compact is fitted with two
alarms: a temperature alarm that is activated
if the compressor should overheat and a
pressure alarm that is activated if the air
pressure in the compressed air reservoir
drops
The Compressor Compact is available in a
number of versions each adapted to different
mains power supply and frequence With the
exception of the ratings of various electrical
components these versions are identical
The Compressor Compact can be equipped
with a standby function In the standby
mode, the compressor will start to deliver
compressed air if the hospital central gas
supply fails

Compressor Compact
E382 EH81E 061 01 03 02 Siemens-Elema AB 5
Main units
The Compressor Compact comprises five
main units:
• Compressor section
• Cooling section
• Dryer section
• Air outlet section
• Control section
Introduction
Dryer section
Cooling section
Compressor section
Control section
Air outlet section
COMP001E

6 Siemens-Elema AB E382 EH81E 061 01 03 02
Compressor Compact
Basic principles
This text also refers to the Block diagram on
page 53
Compressor section
The compressor section contains the
following main parts:
• Air inlet with filter
• Air inlet silencer
• Temperature sensor
• Motor
• Drive unit
• Compressor
• Heat convector
The air inlet is supplied with ambient air from
the inside of the dryer section, i e air that
has been filtered by the dust filters This air
then passes through the air inlet with filter
and the air inlet silencer The air is then
routed to the two-stroke compressor The
compressor is powered by the electric motor
via the drive unit The tension of the drive
belt is automatically adjusted
The action of the compressor imparts heat to
the compressed air To provide preliminary
cooling, the air flow is passed through the
heat convector before it enters the cooling
section
The motor, compressor and heat convector
are cooled by the air stream forced through
the compressor section by the fan in the
dryer section The temperature sensor
detects the ambient air temperature inside
the compressor section and activates the
temperature alarm if the compressor section
is overheated
Heat convector
Drive unit
Compressor
Air inlet
with filter
Air inlet
silencer
Temperature
sensor
Motor
COMP002E
Introduction

Compressor Compact
E382 EH81E 061 01 03 02 Siemens-Elema AB
Coolin section
The main part of the cooling section is the
cooling coil which provides further preliminary
cooling of the compressed air The compres-
sed air flow, supplied from the compressor
section, passes through the cooling section
via this cooling coil
The cooling coil is cooled by the air stream
forced through the cooling section by the fan
in the dryer section This air stream is then
routed to the compressor section
Cooling coil
COMP003E
Introduction

8 Siemens-Elema AB E382 EH81E 061 01 03 02
Compressor Compact
Dryer section
The dryer section contains the following
main parts:
• Water separator 1
• Thermoelectric cooler
• Water separator 2
• Filter/solenoid valves
• Drainage bottle
• Standby solenoid valve
• Low pressure switch
• Standby pressure switch
• Pressure regulator
• Electric power supply
• Electrical interconnection
• Fuses
• Dust filters
• Fan
Compressed air, supplied from the cooling
section, passes through water separator 1
In this “water trap”, some amount of water is
separated from the compressed air
The air flow then passes through the
thermoelectric cooler where the air
temperature is further lowered Moisture that
remains in the compressed air is then partly
transformed into water by condensation This
water is separated from the air in water
separator 2
The dried, compressed air from the air outlet
of water separator 2 is collected in the
compressed air reservoir
A pressure regulator is connected to the
compressed air tubing Air pressure in excess
of the preset level on this pressure regulator,
normally approx 400 kPa (4 0 bar), will
cause a flow which is fed back to the inlet of
the compressor via the air inlet silencer
Fan
Pressure
regulator
Electrical
interconnection
Dust
filter
Fuses
Electric
power supply
Filter / Solenoid
valves
COMP004E
Introduction
Water
separator 1
Water
separator 2
Low
pressure
switch
Thermoelectric cooler
Drainage
bottle
COMP016E
Fan

Compressor Compact
E382 EH81E 061 01 03 02 Siemens-Elema AB 9
Water separators 1 and 2 are automatically
drained at regular intervals by the two filter/
solenoid valves The water is collected in the
drainage bottle
A low pressure switch is connected to the
compressed air reservoir This switch
(sensor) detects the air pressure inside the
compressed air reservoir and activates the
pressure alarm if the air pressure in the
reservoir drops
Compressors equipped with the standby
function also include a standby solenoid
valve and a standby pressure switch
Compressed air from the hospital central gas
supply is connected to the compressed air
reservoir (via the standby solenoid valve) If
the hospital central gas supply fails, the
pressure in the reservoir drops This air
pressure drop is then detected by the
standby pressure switch and the compressor
starts to deliver compressed air to the
reservoir
The electric power supply functions (trans-
former, rectifier, capacitors, etc ) are located
in the dryer section Internal power supply is
distributed from the electrical interconnection
block The mains power fuses and the
cooling dryer fuse are also situated at the
electrical interconnection block
The dryer section also contains a fan to
provide forced air cooling in the cooling
section and compressor section Two dust
filters remove dust particles from the ambient
air before the air is drawn into the fan
Introduction
Drainage
bottle
COMP005E
Water
separator 1
Water
separator 2
Low
pressure
switch
Standby
pressure
switch
Thermoelectric cooler
Fan
Standby
solenoid
valve

10 Siemens-Elema AB E382 EH81E 061 01 03 02
Compressor Compact
Air outlet section
The air outlet section contains the following
main parts:
• Compressed air reservoir
• Pressure manometer
• Moisture relief valve
• Compressed air outlet
• Compressed air inlet
• Cooling air outlet
The dried air is supplied via water separator 1
in the dryer section to the compressed air
reservoir The compressed air is available at
the compressed air outlet
The air pressure in the compressed air
reservoir is displayed by the pressure
manometer
If water, for some reason, is collected in the
compressed air reservoir, this water can be
removed by pressing the valve pin of the
moisture relief valve
Compressors equipped with the standby
function include a compressed air inlet
where the hospital central gas supply
(medical grade air) is connected
The cooling air stream that has been forced
through the cooling section and compressor
section exits via the silenced cooling air
outlet
COMP006E
Compressed
air reservoir
Pressure
manometer
Moisture
relief
valve
Introduction
Compressed
air inlet
Compressed
air outlet
Cooling
air outlet
COMP007E

Compressor Compact
E382 EH81E 061 01 03 02 Siemens-Elema AB 11
Control section
The control section contains the following
main parts:
• On/off switch
• Operating time meter
• Electrical control functions
• Test button
• Indicator lamps
• Buzzer
Mains power to the compressor is connected
via and controlled by the on/off switch The
operating time meter indicates how many
hours the compressor has been running
Electrical control functions are located on a
PC board in the control section This PC
board also contains the timing circuit for the
solenoid valves
There are three indicator lamps (four if the
compressor is equipped with the standby
function) The test button is used to check
that the indicator lamps for temperature
alarm and pressure alarm light up
The audible alarm (buzzer) is activated
together with the indicator lamp during
temperature alarm and pressure alarm
ON/OFF
switch Operating
time meter
Electrical
control
function
Test button
Indicator lamps
Buzzer
COMP008E
Introduction

12 Siemens-Elema AB E382 EH81E 061 01 03 02
Description of functions Compressor Compact
Description of
functions
The text in this chapter Description of
functions refers to the:
• Circuit and connection diagrams and Block
diagram on pages 48 – 51
1. Compressor section
1.1 Air inlet with filter
The AIR INLET WITH FILTER supplies
ambient air from the 3 DRYER SECTION to
the 1 2 SILENCER The filter is made of a
felt, and must be replaced at the 2000 hour
overhaul as well as at the 8000 hour
overhaul The filter must not be cleaned in
any liquid
1.2 Silencer
The air inlet SILENCER will reduce the noise
from the air inlet of the compressor at the
same time as it works as an air distributor to
the two cylinder heads of the 1 6 COMPRES-
SOR
1.3 Temperature sensor
The TEMPERATURE SENSOR detects the
temperature inside the 1 COMPRESSOR
SECTION If the temperature at this sensor
exceeds 70°C ±3°C (158°F ±5°F), the
temperature alarm is activated
The temperature alarm is deactivated when
the compressor is switched off or when the
temperature at the sensor drops below
55°C ±6°C (131°F ±11°F)
The temperature alarm function is further
described in section 5 6 TEMPERATURE
ALARM LAMP
1.4 Motor
The Compressor Compact is equipped with
a single phase electric MOTOR The motor
is designed according to IEC 34 standards
There are several different versions of the
motor each adapted to different mains power
supply and frequence
The motor is equipped with a thermal switch
that will disconnect the current through the
motor if the motor is overheated
115 V version
The 115 V motor is fitted with a manually
resetable thermal switch When the motor
has cooled down, the thermal switch must be
reset manually by pushing the reset button
on the motor
230 V version
The 230 V motor is fitted with a self-resetting
thermal switch When the motor cools down,
the thermal switch will automatically restart
the motor
Note – 230 V versions of the Compressor
Compact as well as spare part motors
manufactured up to and including June 1993
are not equipped with this thermal switch
COMP068E
Reset
button

Compressor Compact Description of functions
E382 EH81E 061 01 03 02 Siemens-Elema AB 13
As motors fitted with a self-resetting
termal switch can restart automatically,
all personnel must exercise extreme
caution when in the vicinity of this equip-
ment if fault tracing is performed with
mains power supply connected and with
the compressor cover opened or
removed
The motion of the motor is transmitted to the
compressor by the 1 5 DRIVE UNIT
1.5 Drive unit
The DRIVE UNIT transmits the motor's
motion to the compressor The drive unit
consists of two grooved belt pulleys, a drive
belt and a spring-loaded belt tightener
The two pulleys are mounted on the motor
shaft and compressor shaft with clamp
bushes (see chapter Disassembling and
assembling for further information)
The transmission ratio is approx 1 : 2 7 for the
60 Hz motor and 1 : 2 3 for the 50 Hz motor
The tension of the drive belt is automatically
adjusted by the belt tightener
The drive belt must be replaced at the 8000
hour overhaul
1.6 Compressor
The COMPRESSOR is an oil free twin-
cylinder assembly in which the filtered air is
compressed by the action of the twin pistons
A manifold pipe is connected between the
two cylinder heads so that the compressed
air generated collectively by both pistons is
available at a single outlet on one of the
cylinder heads
The compressor’s capacity is at least a flow
rate of 40 l/min at a pressure of 400 kPa
(4 0 bar) The compressor speed is approx
1250 r/min
A complete overhaul of the compressor must
be performed at the 8000 hour overhaul
1.7 Heat convector
Preliminary cooling of the compressed air is
provided by the HEAT CONVECTOR This
heat convector is connected to the output of
the 1 6 COMPRESSOR and supplies com-
pressed air to the 2 COOLING SECTION

14 Siemens-Elema AB E382 EH81E 061 01 03 02
Description of functions Compressor Compact
2. Coolin section
2.1 Coolin coil
A further preliminary cooling of the
compressed air is provided by the COOLING
COIL assembly, which is made of metal
tubing The compressed air to this cooling
coil is supplied from the 1 7 HEAT CONVEC-
TOR, and the output is connected to 3 1
WATER SEPARATOR 1
The cooling coil is cooled by the air stream
forced through the cooling section by the fan
in the dryer section This air stream is then
routed to the compressor section
3. Dryer section
3.1 Water separator 1
WATER SEPARATOR 1 is a “water trap”
made of a Y-piece connector This water
separator is connected to the outlet of the
2 1 COOLING COIL, and it supplies
compressed air to the 3 2 THERMOELEC-
TRIC COOLER and to the 3 9 PRESSURE
REGULATOR
The purpose of this water separator is to
collect moisture that has been transformed
into water by condensation when passing
through the cooling section
The water separator is automatically drained
at regular intervals by one of the two 3 4
FILTER/SOLENOID VALVES, and the water
is collected in the 3 5 DRAINAGE BOTTLE
WATER SEPARATOR 1 in compressors
with standby function has a different design,
see the chapter Introduction, Dryer section
The function and purpose of this water
separator is as described above
3.2 Thermoelectric cooler
The dryer section is equipped with a
THERMOELECTRIC COOLER designed for
12 V DC power supply The thermoelectric
cooler is a self-contained unit including a
Peltier element which has one cool side and
one warm side
The compressed air is supplied to the cool
side of the element via 3 1 WATER SEPA-
RATOR 1 When the temperature of the
compressed air is lowered, moisture that
remains in the air is partly transformed into
water by condensation This water is then
collected in 3 2 WATER SEPARATOR 2
which is connected to the outlet of the
thermoelectric cooler
The warm side of the Peltier element is
cooled by the air stream provided by the
3 14 FAN

Compressor Compact Description of functions
E382 EH81E 061 01 03 02 Siemens-Elema AB 15
A cooler temperature switch (thermostat) is
connected to the Peltier element The switch
detects the temperature at the cool side of
the element To avoid formation of ice in the
thermoelectric cooler, this switch will cut the
power supply to the Peltier element if the
temperature drops below approx +2°C
(+36°F) This thermostat is factory calibrated
and must not be adjusted
The PC board RCD connected to the thermo-
stat is a spark arrestor This PC board RCD
is included in the different versions of the
Compressor Compact with standby function
as follows:
• 100 V/50 Hz: Serial No 50001 or higher
• 100 V/60 Hz: Serial No 40001 or higher
• 115 V/60 Hz: Serial No 20531 or higher
• 230 V/50 Hz: Serial No 30530 or higher
• 240 V/60 Hz: Serial No 60013 or higher
The PC board RCD must be connected with
correct polarity, refer to the Connection
diagrams
Due to service interventions and recom-
mended updates, the PC board RCD can be
included also in Compressor Compact as
follows:
• Compressor Compact with standby
function with Serial No lower than stated
in the list above Exceptions: Units with
Serial No 126 or lower
• Compressor Compact 230 V/50 Hz without
standby function Exceptions: Units with
Serial No 469 or lower
Note: A spark arrestor of a different design
(with components mounted onto the cables)
has been installed in the 115 V/60 Hz version
of Compressor Compact with Serial No :
20498 – 20530 The PC board RCD must
not be installed in these units as long as the
spark arrestor with components mounted
onto the cables is installed
3.3 Water separator 2
WATER SEPARATOR 2 is a standard
compressed air filter provided to filter the air
as well as to separate water from the air
This water separator is connected to the
outlet of the 3 2 THERMOELECTRIC
COOLER, and it supplies compressed air to
the 4 1 COMPRESSED AIR RESERVOIR
(via the 3 6 STANDBY SOLENOID VALVE
in compressors with standby function)
Water separated from the air is collected in
the metal bowl The water separator is
automatically drained at regular intervals by
one of the two 3 4 FILTER/SOLENOID
VALVES, and the water is collected in the
3 5 DRAINAGE BOTTLE
Water separator 2 must be overhauled at the
8000 hour overhaul
3.4 Filter/solenoid valves
The two identical FILTER/SOLENOID
VALVES are designed for 12 V DC power
supply The purpose of these valves is to
remove water collected in 3 1 WATER
SEPARATOR 1 and 3 3 WATER SEPARA-
TOR 2 at regular intervals
The electrically controlled solenoid valves
are closed in non-activated condition During
operation, the solenoid valves will be
activated (open) for approx 0 5 seconds
twice every minute by the timing circuit in
5 3 ELECTRICAL CONTROL FUNCTIONS
When the solenoid valves open, the water
collected in the water separators will be
transported to the 3 5 DRAINAGE BOTTLE
via solenoid valves
The filter/solenoid valves must be
overhauled at the 8000 hour overhaul

16 Siemens-Elema AB E382 EH81E 061 01 03 02
Description of functions Compressor Compact
3.5 Draina e bottle
The DRAINAGE BOTTLE collects the water
that is extracted from the compressed air by
3 1 WATER SEPARATOR 1 and 3 3 WATER
SEPARATOR 2 It is a plastic container with
a screw cap into which the water hose from
the water separators is connected There is
a ventilation hole in the cap
3.6 Standby solenoid valve
Compressors with standby function are
equipped with a STANDBY SOLENOID
VALVE This is an electrically controlled
three-port valve with the following function:
1 If the air pressure in the hospital central
gas supply, connected to the 4 5 COM-
PRESSED AIR INLET, is above approx
300 kPa (3 0 bar), the standby solenoid
valve connects this inlet with the 4 1
COMPRESSED AIR RESERVOIR The
compressor is not active
2 If the air pressure in the hospital central
gas supply, connected to the 4 5 COM-
PRESSED AIR INLET, drops and stays
below approx 300 kPa (3 0 bar) for a few
seconds, the standby solenoid valve
connects the 3 1 WATER SEPARATOR 2
with the 4 1 COMPRESSED AIR
RESERVOIR The compressor starts to
supply compressed air to the reservoir
The standby solenoid valve is controlled by
the 3 8 STANDBY PRESSURE SWITCH
via the 5 3 ELECTRICAL CONTROL
FUNCTIONS
The standby function is further described in
section 5 7 STANDBY LAMP
3.7 Low pressure switch
The LOW PRESSURE SWITCH is
connected to the 4 1 COMPRESSED AIR
RESERVOIR This switch will activate the
pressure alarm if the air pressure in the
reservoir drops and stays below 280 kPa
(2 8 bar) for more than 10 seconds
The pressure alarm is deactivated when the
compressor is switched off or when the
pressure in the reservoir rises above approx
280 kPa (2 8 bar)
The pressure alarm function is further
described in section 5 8 PRESSURE
ALARM LAMP
3.8 Standby pressure switch
Compressors with standby function are
equipped with a STANDBY PRESSURE
SWITCH This switch will start the
compressor if the air pressure in the 4 1
COMPRESSED AIR RESERVOIR (supplied
by the hospital central gas supply via the 4 5
COMPRESSED AIR INLET) drops and stays
below 300 kPa (3 0 bar) for a few seconds
The switch will also set the 3 6 STANDBY
SOLENOID VALVE to supply gas from the
1 6 COMPRESSOR
The standby function is further described in
section 5 7 STANDBY LAMP

Compressor Compact Description of functions
E382 EH81E 061 01 03 02 Siemens-Elema AB 1
3.9 Pressure re ulator
The compressed air supply is tapped off at a
three-port coupling at the thermoelectric
cooler-inlet and applied to the PRESSURE
REGULATOR This device is actually a relief
valve
Pressure in excess of the set level, normally
approx 400 kPa (4 0 bar), opens this relief
valve The excess compressed air flow is
returned to the inlet of the 1 6 COMPRES-
SOR via the 1 2 SILENCER This arrange-
ment effectively silences the outlet of this
relief valve
For pressure adjustment, see the chapter
Adjustments
The pressure regulator must be overhauled
at the 8000 hour overhaul
3.10 Electric power supply
The ELECTRIC POWER SUPPLY is a
collective name for some of the parts
included in the power supply to the different
electrical components in the compressor
Mains power (115 or 230 V AC) is connected
to the on/off switch (via the mains power
fuses) and from here distributed to the:
• Operating time meter
• Fan
• Compressor motor
• Transformer
All other electrical components are supplied
with 12 V DC
The main parts in the ELECTRIC POWER
SUPPLY block are the:
• Transformer
• Rectifier with capacitor
• Start relay (compressors with standby
function)
The transformer used in the compressor is a
toroid transformer There are two different
versions of the transformer, one for 115 V
mains power supply and one for 230 V
mains power supply The output is 12 V and
max power consumption is 100 VA for both
transformers
Transformers with serial number extention
-0017 are fitted with a self-resetting thermal
switch that will disconnect the current through
the transformer if it is overheated When the
transformer cools down, the thermal switch
will automatically reconnect the current
through the transformer
As transformers fitted with termal switch
can reconnect automatically, all personnel
must exercise extreme caution when in
the vicinity of this equipment if fault tracing
is performed with mains power supply
connected and with the compressor cover
opened or removed
The compressor is equipped with a rectifier
that is supplied with 12 V AC from the
transformer The rectifier consists of a
rectifier bridge assembled as a complete,
exchangable unit
The rectifer smoothing capacitor used is
rated 24 V, 22 000 µF
3.11 Electrical interconnection
The different electrical components are
connected to the ELECTRICAL INTER-
CONNECTION terminal The three fuses
mentioned in the description of 3 12 FUSES
are located in this terminal block

18 Siemens-Elema AB E382 EH81E 061 01 03 02
Description of functions Compressor Compact
3.12 Fuses
The compressor is equipped with three
FUSES: two mains power fuses (F1 and F2)
and one fuse for the 12 V power supply (F3)
The fuses are located in the 3 11 ELECTRI-
CAL INTERCONNECTION block
Fuse No. Type No. Manufacturer Dimension
115 V versions
Mains power fuses:
F1/F2 MDA 10A 250V Bussman 6 3 x 32
12 V power fuse:
F3 MDA 15A 250V Bussman 6 3 x 32
230 V versions
Mains power fuses:
F1/F2 T 6 3AL – 5 x 20
12 V power fuse:
F3 T 10AL 250V Littelfuse 5 x 20
When replacing fuses in the Compressor
Compact, make sure to use fuses as stated
above (Type No and Manufacturer)
If the compressor is connected to mains
power, there is live voltage at the mains
power fuses even when the on/off switch
is in OFF (0) position
3.13 Dust filters
There are two DUST FILTERS mounted on
the compressor housing These two identical
filters are made of a synthetic material
They must be regularly inspected and
cleaned as described in the Operating
Manual, chapter Cleaning The filters must
be replaced at the 2000 hour overhaul as
well as at the 8000 hour overhaul
3.14 Fan
The Compressor Compact is equipped with
a double inlet centrifugal FAN The purpose
of the fan is to provide forced air cooling for
the 1 COMPRESSOR SECTION and the
2 COOLING SECTION
There are two different versions of the fan,
one for 115 V mains power supply and one
for 230 V mains power supply
The fan motor is fitted with a self-resetting
thermal switch that will cut the power supply
to the fan motor if the temperature at the
switch exceeds approx 130°C (266°F)
COMP045X
F1 / F2 F3

Compressor Compact Description of functions
E382 EH81E 061 01 03 02 Siemens-Elema AB 19
4. Air outlet section
4.1 Compressed air reservoir
The COMPRESSED AIR RESERVOIR is a
plastic container with a volume of approx
1 8 liters
4.2 Pressure manometer
A PRESSURE MANOMETER is connected
to the 4 1 COMPRESSED AIR RESERVOIR
This manometer shows the air pressure in
the reservoir The manometer has the range:
• 0 – 6 bar in older versions of the
Compressor Compact
• 0 – 10 bar in newer versions of the
Compressor Compact
4.3 Moisture relief valve
The MOISTURE RELIEF VALVE is
connected to the bottom of the 4 1 COM-
PRESSED AIR RESERVOIR with a plastic
tube This valve is a spring-loaded valve that
is provided to drain the air reservoir if water,
for some reason, collects in the reservoir
The valve pin must be pushed manually to
drain the air reservoir
4.4 Compressed air outlet
The COMPRESSED AIR OUTLET is
connected directly to the 4 1 COMPRESSED
AIR RESERVOIR It consists of a female
(AGA standard) quick-coupling and a hose
nipple for an 8 mm hose
The test nozzle attached to the compressor
must be used when performing functional
checks or troubleshooting on the
Compressor Compact It provides a
simulated load that permits rapid, easy
checks of the output pressure
When testing the Compressor Compact, the
test nozzle should be connected to this outlet
so that compressed air flows through the
nozzle Output pressure can then be read off
from the pressure manometer
The test nozzle permits an air flow that is
higher than 40 l/min For this reason the air
pressure in the system may not reach the
stated 400 kPa (4 bar) when the test nozzle
is connected An air pressure of 400 kPa
±50 kPa (4 0 bar ±0 5 bar) indicated on the
manometer shows that the compressor is
operating correctly
4.5 Compressed air inlet
Compressors with standby function are
equipped with a COMPRESSED AIR INLET
This air inlet is connected to the 4 1 COM-
PRESSED AIR RESERVOIR via the
3 6 STANDBY SOLENOID VALVE The
purpose of the air inlet is to provide com-
pressed medical grade air from the hospital
central gas supply to the air reservoir
The inlet nipple must be adapted to local
standards The inlet hole in the reservoir is
provided with a 12 x 1 mm thread
The standby function is further described in
section 5 7 STANDBY LAMP
4.6 Coolin air outlet
The forced cooling air stream provided by
the 3 14 FAN in the dryer section exits from
the compressor via the COOLING AIR
OUTLET The air outlet is covered with foam
rubber to reduce the noise of the air stream

20 Siemens-Elema AB E382 EH81E 061 01 03 02
Description of functions Compressor Compact
5. Control section
5.1 On/off switch
The ON/OFF SWITCH is the switch for mains
power supply to the compressor Mains
power is connected to the mains power
fuses in the 3 11 ELECTRICAL INTER-
CONNECTION terminal and then routed, via
internal cabling, to the on/off switch
5.2 Operatin time meter
The OPERATING TIME METER shows the
cumulative total of the number of hours that
the Compressor Compact has been in
operation The range of the meter is 1/100 of
an hour up to 10,000 hours and it cannot be
reset to zero
5.3 Electrical control functions
The ELECTRICAL CONTROL FUNCTIONS
are located on a PC board in the control
section This PC board controls the:
• Temperature alarm and pressure alarm
• Timing circuits for the solenoid valves 1
and 2 including RL2
• Standby functions including RL1 and RL3
The test button, the indicator lamps and the
buzzer are mounted on this PC board
5.4 Test button
The purpose of the TEST BUTTON is to
make it possible to check the alarm indicator
lamps and the audible alarm
When this button is held depressed, the
indicator lamps for temperature alarm and
pressure alarm will light up The audible
alarm buzzer will also be activated
5.5 Mains power lamp
The green MAINS POWER LAMP is supplied
from the 12 V DC circuit This means that the
mains power lamp indicates that mains
power as well as 12 V power is on
5.6 Temperature alarm lamp
The temperature alarm is activated if the air
temperature at the 1 3 TEMPERATURE
SENSOR exceeds 70°C ±3°C (158°F ±5°F)
This alarm is indicated by the red TEMPE-
RATURE ALARM LAMP and the ALARM
BUZZER
The alarm lamp will stay on until the alarm is
deactivated
The temperature alarm is deactivated at a
temperature below 55°C ±6°C (131°F ±11°F)