Pichler LG 740 Specification sheet

1253/2014
ErP
2018
pichler_lg740.indd 1pichler_lg740.indd 1 13.10.22 13:4913.10.22 13:49
EPREL
EU-regulation
OPERATING AND
INSTALLATION MANUAL
COMPACT VENTILATION UNIT
LG 740
Systematic ventilation.
COMFORT
VENTILATION

USER GENERALSPECIALIST PERSONNEL
OPERATING AND INSTALLATION MANUAL LG 740 PAGE 2
Contents
1. Introduction Page 4
2. General Page 4
3. Functionality of the ventilation system Page 5
4. Designated use Page 5
INTENDED USE PAGE 5
STIPULATIONS FOR OPERATION WITH FIREPLACES PAGE 6
STIPULATIONS FOR OPERATION WITH EXTRACTOR HOODS PAGE 6
LIABILITY PAGE 7
WARRANTY PAGE 7
5. Safety Page 8
SYMBOLS USED IN THIS DOCUMENT PAGE 8
SAFETY REGULATIONS PAGE 8
UNIT SET-UP PAGE 9
ELECTRICAL CONNECTIONS PAGE 9
SYSTEM OPERATION PAGE 10
U  P 
6. Customer service Page 11
7. Design of the ventilation unit Page 11
8. MINI control unit Page 12
9. TOUCH control unit Page 13
10. Errors and notifications Page 22
MINI CONTROL UNIT PAGE 22
TOUCH CONTROL UNIT PAGE 22
11. Pichler app and Pichler Connect Page 22
EASY OPERATION WITH THE PICHLER APP PAGE 22
REMOTE ACCESS / PICHLER CONNECT PAGE 22
DATA PROTECTION PAGE 23
12. Filter service Page 23
FILTER NOTIFICATION ON THE MINI CONTROL UNIT PAGE 23
FILTER NOTIFICATION ON THE TOUCH CONTROL UNIT PAGE 23
FILTER CHANGE PAGE 24
S  -  /  P 
13. Scope of supply, transport, storage and disposal Page 26
SCOPE OF SUPPLY PAGE 26
TRANSPORT, STORAGE AND PACKAGING PAGE 26
DISPOSAL PAGE 26
14. Technical specifications Page 27
VERSIONS PAGE 27
ENERGY EFFICIENCY CLASSES PAGE 27
DEVICE DATA PAGE 28
ACOUSTIC SPECIFICATIONS PAGE 29
CHARACTERISTIC CURVE EXTERNAL PRESSURE INCREASE – AIR VOLUME FLOW PAGE 30
DEVICE STRUCTURE PAGE 31
SAFETY DEVICES PAGE 34

USER GENERALSPECIALIST PERSONNEL
OPERATING AND INSTALLATION MANUAL LG 740 PAGE 3
15. System description and extension options Page 35
FROST PROTECTION OPTIONS PAGE 35
SYSTEM EXTENSION FOR EXTERNAL SUPPLY AIR CONDITIONING PAGE 40
16. TOUCH control unit service level Page 44
TOUCH CONTROL UNIT TEST MODE PAGE 44
17. Mounting Page 46
PREREQUISITES FOR UNIT INSTALLATION PAGE 46
OPENING THE UNIT PAGE 47
UNIT ASSEMBLY PAGE 47
CONDENSATE CONNECTION PAGE 48
CONNECTING AIR DUCTS AND COMPONENTS PAGE 49
AIR TYPES LEGEND PAGE 49
18. Electrical connection Page 50
OPENING THE UNIT PAGE 50
CONTROL BOARD PAGE 50
MAINS CONNECTION AND REPLACEMENT OF THE INTERNAL DEVICE FUSE PAGE 51
CABLE INLETS PAGE 51
ELECTRICAL CONNECTION DIAGRAM PAGE 51
ELECTRICAL CONNECTION DIAGRAM MINI OR TOUCH CONTROL UNITS PAGE 54
ELECTRICAL CONNECTION DIAGRAM FOR EXTERNAL INPUTS PAGE 56
ELECTRICAL CONNECTION DIAGRAM SHUT-OFF VALVES PAGE 57
CONNECTING THE CONTROL UNIT WITH THE CONTROL BOARD PAGE 58
MINI CONTROL UNIT INSTALLATION PAGE 58
TOUCH CONTROL UNIT INSTALLATION PAGE 58
CIRCULATING PUMPS PAGE 58
19. Maintenance and cleaning Page 59
SAFETY INSTRUCTIONS PAGE 59
MAINTENANCE INSTRUCTIONS PAGE 59
HEAT EXCHANGER PAGE 59
FANS PAGE 60
ELECTRIC PRE-HEATING COIL (OPTIONAL) PAGE 60
CLEANING THE EQUIPMENT HOUSING INSIDE PAGE 61
CONDENSATE DRAINAGE PAGE 61
SERVICE TABLE PAGE 62
S  - C - S P 
20. Commissioning Page 64
BASIC COMMISSIONING PROCEDURE PAGE 64
SETTING SYSTEM PARAMETERS PAGE 64
21. Installation/operation of service software and
firmware updates Page 64
22. Error description Page 65
MINI CONTROL UNIT PAGE 65
TOUCH CONTROL UNIT PAGE 65
23. Spare parts and accessories Page 66
24. Changes reserved Page 66
25. Product data sheets Page 67
26. EG-Konformitätserklärung (EC Declaration of Conformity) Page 69

USER GENERALSPECIALIST PERSONNEL
1. Introduction
The LG 740 compact ventilation unit
complies with the state of the art. It is
characterised by cost eectiveness, ease
of use and reliability.
To operate your compact ventilation unit
safely, properly and economically, please
read this manual carefully and follow the
instructions provided.
Use the ventilation unit only when in per-
fect condition and for its designated use,
be aware of safety and any hazards and
cognisant of all the notes and information
contained in this manual. Always keep the
model and serial number (see nameplate
on unit) at hand in the case of queries or
when ordering spare parts.
Please contact us if you have any further
questions or if you lose your documentation.
2. General
J. Pichler
Gesselschaft mbH
AUSTRIA
9021 KLAGENFURT
Karlweg 5
[phone]
www.picherluft.at
Equipment type:
08LG740LFV
Year of
manufacture:
Volume flow:
max. 750 m³/h
Weight: 130 kg
Dimensions WxHxD:
1090x940x660 mm
Voltage/frequency:
230 V / 50 Hz
Performance:
max. 2800 W
Order number:
123456789 A
Serial number:
F2 202 00 001
J. Pichler Gesellschaft m.b.H.
9021 KLAGENFURT
Karlweg 5
T [phone]
This section contains general information
on the LG740 compact ventilation unit
with the MINI or TOUCH control unit.
READ THIS MANUAL CAREFULLY
BEFORE OPERATION.
This manual contains notes and infor-
mation regarding safe operation and
proper installation of the LG740 compact
ventilation unit, as well as operation and
maintenance. Furthermore, reference this
manual during servicing to ensure proper
execution of the tasks. Keep this operating
manual readily available in a safe place.
Troubleshooting and procedures may be
performed by an installation company
(specialist company) only.
Changes reserved:
This manual has been compiled with
the utmost care. This does not, however,
imply any rights. We constantly strive to
improve and optimise our products tech-
nically and we reserve the right to modify
our apparatus or technical data fully or in
part and without prior notification. Your
unit may therefore vawry slightly from the
description in this manual.
Our "General terms and conditions" in
their latest version apply.

USER GENERALSPECIALIST PERSONNEL
3. Functionality of the ventilation system
With mechanically-controlled residential
ventilation, used, damp extract air is
conducted away from wet domestic areas,
e.g. bathroom, toilet and kitchen, and
is replaced with fresh, processed and
filtered outdoor air in lounge areas, e.g. in
living rooms and bedrooms.
Significant energy savings are achieved
when the system is operated continuously
thanks to highly ecient heat exchangers
for heat recovery from extract air into the
supply air and use of energy-ecient fans
with the latest EC motor technology for air
flow control. This technology is particu-
larly eective in air-tight building shells
and with active thermal insulation. Heat
recovery with an eciency of over 90%
ensures highly ecient operation.
It is particularly important to ensure that
the heat exchanger is protected by a suit-
ably controlled frost protection strategy
and that there is an eective condensate
drain.
The LG 740 compact ventilation unit is
suitable for installation in air conditioning
systems for the controlled mechanical
ventilation of residential buildings, small
residential complexes, oces and similar
applications such as small and medi-
um-sized classrooms with an adjustable
air volume flow of up to 750m³/h.
The purpose of controlled mechanical
ventilation of domestic areas is to improve
air quality and reduce the heating energy
demand through the use of a highly
ecient heat recovery system, and to
influence indoor air humidity.
The scope and intended use for the unit
are limited to the use in technical systems
for the extraction of used air and the sup-
ply of fresh, tempered outdoor air at maxi-
mum flow media temperatures of -15°C
to +35°C. Furthermore, the air conveyed
must be free from aggressive vapours
and substances enhancing wear.
Any other use shall be deemed contrary
to designated use. The manufacturer shall
accept no responsibility for damages or
consequential damages arising from im-
proper use. Designated use also includes
adherence to our prescribed operating
and installation manual.
This unit is available to the general public
and is intended for installation in residen-
tial or industrial buildings. The unit is used
for mechanical ventilation of indoor air
and, combined with heating and cooling
systems, also for auxiliary air heating/
cooling.
This unit is not intended for use by
persons, including children, with limited
physical, sensory or mental capacities
or lacking experience and/or knowledge,
unless under supervision or instruction of
a person responsible for their safety.
The unit is not suitable for outdoor instal-
lation and may be installed in suitable
and frost-free interior areas only. The
ventilation unit is not suitable for drying
new buildings.
In order to prevent the uncon-
trolled formation of condensate
in the unit, continuous opera-
tion with an extract air humidity of more
than 50% has to be avoided at extract air
temperatures above 25°C and outdoor
air temperatures below 0°C (e.g. private
spa area).
4. Designated use
INTENDED USE

USER GENERALSPECIALIST PERSONNEL
Due to the heavy load as well as the
irregular operation, the extract air of an
existing kitchen extractor hood must not
be integrated into the dwelling's ventila-
tion system. Extract air from such extrac-
tor hoods must be conducted separately
by means of an exhaust air pipe over the
roof. The supply air must be provided for
separately (e.g. by window ventilation).
If an extractor hood without the separate
provision of supply air is operated, the
balance of the air volume in the dwelling
is no longer kept and the proper function
of the dwelling's ventilation system is no
longer ensured (odour diversion, etc.).
Another option is to operate the extractor
hood in recirculation mode.
STIPULATIONS FOR OPERATION WITH
FIREPLACES
STIPULATIONS FOR OPERATION WITH
EXTRACTOR HOODS
Local requirements must be taken into
consideration by compliance with corre-
sponding standards, laws and directives.
The central ventilation units
with heat recovery may only
be installed in rooms, flats or
utilisation units of a comparable size in
which fireplaces dependent on room air
are installed, if:
• simultaneous operation of room
air-dependent fireplaces and the air
extraction unit is prevented by safety
devices, or
• the flue gas evacuation of the room
air-dependent fireplace is monitored
by special safety devices. In the case of
room-air dependent fireplaces for liquid
or gaseous fuels, activation of the safety
device must lead to the switch-o of
the fireplace or ventilation unit. In the
case of room-air dependent fireplaces
for solid fuels, activation of the safety
device must lead to the switch-o of the
ventilation unit.
The central ventilation units for the
controlled ventilation of a flat or a com-
parable living unit must not be installed
if room air-dependent fireplaces in the
living unit are connected to exhaust gas
systems, which themselves have multiple
connections.
Normal operation of the ventilation sys-
tems established by means of the central
ventilation units requires the possibility of
shutting potentially available combustion
air ducts as well as exhaust gas systems
o from room air-dependent fireplaces. In
the case of exhaust gas systems of fire-
places for solid fuels, it must be ensured
that the shut-o device can only be oper-
ated manually. The position of the shut-o
device must be identifiable by the setting
of the operating handle. This specification
is considered as complied with if a shut-
o device against soot is used.
Fire protection requirements
With regard to the fire protection instal-
lation regulations for the set-up of the
ventilation unit, the provisions of national
law, in particular the building regulation
concerning the fire protection require-
ments with regard to ventilation systems
in the relevant latest version must be
observed.
The compact ventilation unit is not a
ready-to-use product. It must not be put
into operation until it has been properly
installed and connected to a ventilation
system. Only qualified and instructed per-
sonnel may work on and with the unit.
Persons transporting, installing
or working on the unit must
have read and understood the
operating instructions, in particular sec-
tion5, "Safety". The end user must also be
instructed on potential hazards.

USER GENERALSPECIALIST PERSONNEL
The LG 740 compact ventilation unit was
developed and manufactured for use in
the controlled mechanical ventilation of
residential buildings, larger residential
units, oces and similar applications
such as small and medium-sized class-
rooms.
Proper use of the ventilation systems
established with the central ventilation
units requires that combustion air lines
and exhaust systems have the facility to
be shut o from fireplaces dependent on
ambient air.
Any other use shall be deemed improper
and may cause personal injury or damage
to the ventilation unit, for which the man-
ufacturer shall accept no liability.
The manufacturer accepts no
responsibility for any damage due to:
• non-compliance with the safety, operating
and servicing instructions given in this
operating and installation manual.
• the installation of spare parts that have
not been supplied by the manufacturer,
the responsibility for the use of such
spare parts being fully borne by the
system builder/installer.
• normal wear and tear.
LIABILITY
The warranty period shall commence
after the unit is put into operation, but
no later than one month after delivery.
Warranty details can be found in our
“General terms and conditions” in their
latest version as well as the merchant
conditions of your respective country.
The warranty shall be subject to proof of
services performed as per our instruc-
tions and executed by a licensed installer/
specialised company.
Warranty claims shall be limited to
material and/or constructional defects
occurring during the warranty period. In
the event of a warranty claim, the LG740
compact ventilation unit must not be dis-
mantled without prior written authorisa-
tion from the manufacturer. The manufac-
turer's liability shall be limited to spare
parts installed by an installation company
approved by the manufacturer.
The warranty shall automatically lapse at
the end of the warranty period, following
improper operation such as operation
without a filter, if parts other than original
manufacturer-supplied parts are installed,
or if unauthorised changes are made to
the unit.
Furthermore, the warranty is automati-
cally rendered void by failure to comply
with the information in this operating and
installation manual.
WARRANTY

USER GENERALSPECIALIST PERSONNEL
5. Safety
Read this operating and installation man-
ual carefully and observe the safety in-
structions while you carry out installation,
commissioning, servicing or general work
on the ventilation unit. Keep the operating
and installation manual near the unit for
its entire service life.
Always observe the safety regulations,
warnings, notes and instructions given
in this operating manual. The specifica-
tions given in this document must not
be altered. Non-observance of these
safety regulations, warnings, notes and
instructions may lead to physical injury or
damage to the compact ventilation unit.
The conclusion of a service contract is
recommended to ensure that the unit
will be checked at regular intervals. Ask
your supplier about approved specialised
companies/installers in your area.
SYMBOLS USED IN THIS DOCUMENT The following safety symbols highlight
text containing warnings in respect of
danger and potential hazards. Please
familiarise yourself with these symbols.
Attention/Note!
Attention! Ignoring this warning
may lead to injury or threat to
life and limb and/or damage to
the unit.
Attention – High voltage! Ignoring
this warning may lead to injury
or threat to life and limb.
Installation, initial start-up,
maintenance and repairs
must only be carried out by an
authorised specialist company.
Over and above this operating and instal-
lation manual, local and national regula-
tions and standards shall also apply to the
operation of this unit without limitation.
Take instruction from your installer on the
unit and on its control unit following in-
stallation. The ventilation unit may only be
used in accordance with the information
provided in section4 "Designated use”.
All safety and danger notices attached to
the unit and specified in this description
must be observed.
In the event of malfunctioning, switch o
the unit immediately and disconnect the
power plug. The unit must be appropriate-
ly secured against restart. Faults must be
remedied immediately.
After repairs and maintenance work,
qualified personnel must verify that the
unit is safe to operate.
Attachment or installation of additional
parts and components is not permitted.
Any modification of the compact ventila-
tion unit is prohibited. Only original spare
parts may be used.
Modifications and alterations to the
ventilation unit are prohibited and absolve
the manufacturer from all warranties and
liability.
Ensure that children do not play with the
unit.
SAFETY REGULATIONS

USER GENERALSPECIALIST PERSONNEL
The national and local regulations
must be heeded when installing
and setting up the unit. The unit
may only be installed in compliance with
national installation regulations.
Installation shall be carried out in
accordance with the general local build-
ing, safety and installation regulations of
the relevant community or the water and
electricity department and other bodies.
The unit may only be installed in frost-free
and dry rooms. The room temperature at
the place of installation must be consist-
ently between +5°C min. and +35°C max.
The unit is designed for free-standing
installation and may only be set up on a
suitable, load-bearing construction. The
unit must not be exposed to vibration of
any kind.
Suitable drainage of condensate arising
during operation of the unit will be re-
quired, including eective odour blocking
traps (siphon). Installations for water,
heating and condensate connections may
be performed by a specialist only. The unit
must be installed and executed appropri-
ately so as to ensure seal-tightness and
eective condensate drainage in order to
exclude the possibility of building damage.
Eective condensate drainage must be
verified on-site prior to initial start-up and
after servicing the unit.
The maximum permissible load must be
observed when transporting the unit.
Components of the ventilation unit, e.g.
air ducts which may need to be installed
in unheated areas, must be suitably insu-
lated to prevent heat loss or condensate
formation (for temperatures under dew-
point). Observe all locally-applicable con-
struction and fire protection guidelines,
regulations and standards. If necessary,
appropriate suitable measures should be
taken when installing the unit, e.g. instal-
lation of fire dampers in air ducts, etc.
UNIT SET-UP
Warning: hazardous electrical
voltage! Ignoring the danger
may result in death, injuries or
material damage. Before carrying out
any work on live parts, the unit must
always be disconnected completely from
the power supply (all poles) and secured
against being switched back on.
The shockproof connector system on the
mains supply line allows for disconnect-
ing all poles of the unit from the power
supply.
Electrical connection work and
work on the system's electrical
components may be carried out
by authorised electricians only, in compli-
ance with national and local regulations.
Before opening the unit and
when carrying out work on the
unit, e.g. maintenance work and
repairs, the unit must be isolated from
the mains (all poles disconnected) and
secured against being switched back on
for the duration of the work. The compact
ventilation unit is designed for a voltage
supply of 230V/ 50Hz.
Work practices that could
potentially damage the unit are
prohibited. To ensure safe oper-
ation, safety devices must not be removed
or bypassed.
Electrical equipment and the unit's
warning and protective devices must be
inspected regularly to ensure that they
are in perfect working order. In the event
of faults in the electrical power supply or
identification of defects, e.g. loose con-
nections or burnt cables, the unit must be
switched o immediately.
Damaged or faulty power supply cables to
the unit must be repaired immediately to
avoid hazards.
ELECTRICAL CONNECTIONS

USER GENERALSPECIALIST PERSONNEL
Operation of the ventilation unit
is permitted only if all built-in
parts provided, e.g. silencers
etc., have been properly connected.
In the event of any errors or
defects that can cause harm to
persons or property, the system
must be put out of operation immediately.
Further use must be actively prevented
until the unit is fully repaired.
If error messages are output or in the
case of damage, the ventilation unit must
be switched o and disconnected from
the mains immediately. Be aware of your
safety and of hazards when opening the
unit or removing cover plates. Any work
practices that could potentially impair the
safety of the unit are prohibited.
Operation of the unit is ex-
clusively permissible with a
connected air duct or mounted
system components such as silencers,
in order to ensure that, for example, fans
or electrical installation parts, cannot be
touched with the hand.
The compact ventilation unit may be op-
erated only in accordance with the project
documentation, which shall comply with
the Equipment and Product Safety Act and
the pertinent provisions of the EC Direc-
tives and Standards.
Consider environmental impacts and re-
frain from installing the ventilation unit in
the vicinity of flammable liquids or gases,
in swimming pools or in areas exposed to
chemicals.
Never operate the ventilation unit without
an air filter. Air filters must be checked
regularly for dirt and damage and re-
placed, if necessary. The air filters must
be changed at least every six months
or when the “Change filter” message
appears on the control unit. Use original
replacement filters only. If the unit is not
used in summer, the air filters must, for
hygienic reasons, be replaced prior to
restarting.
Comply with safety requirements and
standards when operating the ventilation
unit simultaneously with ambient air-de-
pendent fireplaces. When using fireplaces
dependent on ambient air, combustion air
supply must be provided separately. See
the provisions in section4, item “Rules for
operation with fireplaces”.
Due to the heavy load as well as the irreg-
ular operation, extractor hoods must in no
case be integrated into the extract air duct
of the compact ventilation unit. See the
provisions in section4, item “Rules for use
with extractor hoods”. Exhaust air extrac-
tor hoods must be operated via separate
air pipes with suitable air replenishment,
e.g. by means of window ventilation or in
air recirculation mode.
SYSTEM OPERATION
The unit may not be operated until safe
operational conditions are restored.
Fault finding and immediate remediation
of electrical defects and malfunctions
shall be carried out by authorised electri-
cians only. All protective measures must
be inspected (e.g. earth resistance, etc.)
after completion of electrical work on the
unit. For details, see Section 18: “Electrical
Connection”.

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 11
USER GENERALSPECIALIST PERSONNEL
The LG 740 compact ventilation unit is
used for the controlled mechanical venti-
lation of residential buildings,
larger residential units, oces and
similar applications such as small
and medium-sized classrooms and is
suitable for free-standing installation in
frost-free rooms.
The area of use extends to living space
ventilation systems with a required air
volume flow of 150 - 750m³/h.
Operation is simple and intuitive and can
also be done via the Pichlerluft app when
connected to the Internet (LAN connec-
tion). For details, see section11 - Pichler
app and Pichler Connect.
The compact ventilation unit 740 in-
cludes:
• A compact, thermal bridge-free and
heat-insulated casing made from galva-
nised sheet steel, exterior powder-coat-
ed in RAL9003
• A highly ecient heat recovery system
with an air/air counterflow heat ex-
changer
• An option for additional moisture recov-
ery (enthalpy exchanger)
• An automatic 100% bypass to bypass
the heat exchanger if necessary
• Energy-saving radial fans with the latest
EC motor technology
• An integrated volume flow measure-
ment, which guarantees balanced oper-
ation between the supply and extract air
side. Even if the system pressure chang-
es, the set air volume flow is maintained,
e.g. if the filter is dirty
• An expansion option to implement
constant pressure control is also
optionally available.
• ISO ePM1 55% outdoor air filter and ISO
Coarse 70% extract air filter
• Integrated filter monitoring: when the
time interval is reached, the message
"Change filter" appears on the control
unit
• Filter cover for tool-free filter mainte-
nance when the front of the device is
closed.
• Internally wired control electronics
• Comes standard with the MINI control
unit for setting the basic functions
• Optional, convenient TOUCH control unit,
with an integrated room temperature
sensor for extended operation and
display, and with an optional swivelling
console. The control unit can be attached
directly to the ventilation unit.
• When connected to the Internet (LAN
connection), operation via the Pichler
app is possible.
• The unit can be optionally expanded
by adding CO2, humidity and indoor
temperature sensors, which allows for
demand-controlled ventilation operation.
• Optional connection of a heating, cooling
or combination exchanger for additional
conditioning of the supply air
6. Customer service
Please contact the installer of your
ventilation and air conditioning system or
contact us directly for any questions re-
lating to the delivered compact ventilation
unit LG740.
U 
7. Design of the ventilation unit
J. Pichler Gesellschaft m.b.H.
9021 KLAGENFURT
Karlweg 5
T [phone]

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 12
USER GENERALSPECIALIST PERSONNEL
The ventilation unit is operated by means
of four buttons.
Summer, winter or automatic mode
The two buttons on the left side switch
between summer, winter and automatic
mode.
Summer
Summer or bypass mode sup-
ports cooling of the living area.
Under certain conditions, the
heat exchanger is bypassed and the cool-
er outdoor air is introduced directly into
the living space.
Winter
The outdoor air is always con-
veyed via the heat exchanger in
winter operation.
Automatic mode on/o
By pressing the [Summer] and [Winter]
buttons at the same time, you activate
automatic mode. The system changes
automatically between summer and
winter mode depending on the outdoor
air temperature. Active automatic mode is
signalled by the summer and winter LEDs
lighting up. Automatic mode is deactivat-
ed by pressing the [Summer] or [Winter]
button.
BUTTONS AND LEDS
The following compact ventilation unit
functions can be configured with the
“MINI” control unit:
• Selection of the operating mode standby
or basic ventilation
•Ventilation level of the compact ventila-
tion unit
• Switch between summer, winter or auto-
matic mode
• Display of filter change messages
• Display of error messages via LED
FUNCTIONS
8. MINI control unit

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 13
USER GENERALSPECIALIST PERSONNEL
The two buttons on the right-hand
side change the unit's ventilation level.
Increase the ventilation level with the [+]
button until level3 is reached, which cor-
responds to a boost ventilation process.
After 1hour of operation at the highest
ventilation level, normal ventilation mode
(level2) is automatically reset. Alterna-
tively, you can end the boost ventilation
process manually before one hour has
passed. Simply press the [-] button on
your control unit.
Standby or basic ventilation
If the ventilation level selected is less than
I, the device switches to either standby or
basic ventilation mode. For details, see the
“Ventilation levels” section in section9.
LEDs
The ventilation unit's various statuses are
signalled via LEDs. Three LEDs display the
current ventilation level.
On the left side, arranged next to the
corresponding buttons, are the LEDs for
summer, winter or automatic mode.
Filter change
The need to change the filter is signalled
by the LED on the bottom left.
For details on changing the filter, see
section 12 - “Filter maintenance”.
Error messages
The LED for error messages is located on
the lower right side. Please contact your
installer! For details on error messages,
see “Error description” in section21.
CHANGING THE VENTILATION LEVEL
START MENU
1 Current operating mode
2 Ventilation level
3 Temperature (indoor air, supply air, extract air)
4 Menu
5 Date and time
1
2
3
5
4
9. TOUCH control unit

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 14
USER GENERALSPECIALIST PERSONNEL
In principle: "As much ventila-
tion as required"
Adjustment of air volume requires
relevant expertise and is performed by a
specialist during initial start-up.
The ventilation levels can be configured
in standby or basic ventilation modes.
Depending on these settings, the selection
of the lowest ventilation level creates a
standby or basic ventilation mode.
If ventilation is too low, poor indoor air
quality or mould formation may result in
living areas.
If ventilation is too high, indoor air may
become too dry – particularly in the colder
months.
The active ventilation level is displayed by
various buttons. The selected ventilation
level can be changed by pressing the
button. The following selection options are
available:
Scheduler
The system runs at the ventilation level
that is currently programmed. The sched-
uler can be programmed in the [Menu]
under [Settings].
At a higher level, demand-controlled air
volume regulation takes place both in the
time program and with manual selection
of the ventilation level and with connected
configured CO2 and/or humidity sensors.
Programming takes place in the [Settings]
> [Additional functions] menu item.
OPERATING MODE
The active operating mode is displayed by
various buttons. The selected operating
mode can be changed by pressing the
button. The following operating modes are
available:
Summer
Summer or bypass mode sup-
ports cooling of the living area.
Under certain conditions, the
heat exchanger is bypassed and the cold
outdoor air is blown directly into the living
room.
Winter
The outdoor air is always con-
veyed via the heat exchanger in
winter operation.
Automatic
In automatic mode, the system switches
automatically between winter and sum-
mer modes depending on the outdoor air
temperature.
Automatic mode is shown in brackets
below the current operating mode.
KƉĞƌĂƚŝŶŐŵŽĚĞ
Automatic
Summer
Winter
VENTILATION LEVEL
sĞŶƚŝůĂƚŝŽŶůĞǀĞů
On Off
Scheduler
Ventilation Level 1

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 15
USER GENERALSPECIALIST PERSONNEL
Manual selection
When the time program is deactivated
[OFF], the ventilation level can be selected
manually. This selection is carried out via
the [+] or [-] button and via the [OK] button
in the lower section of the control unit.
Configuration standby
Ventilation level 1
The system runs at ventilation
level 1
Ventilation level 2
The system is running in venti-
lation level 2
Ventilation level 3
The system runs at ventilation
level 3
By selecting ventilation level3, you
activate the boost ventilation function.
After 1hour of operation at the highest
ventilation level, the system automati-
cally resets to the previous ventilation
level. Alternatively, by selecting a lower
ventilation level, you can end the boost
ventilation process manually before one
hour has passed.
Standby
The system is in standby mode.
The fans stand still.
Configuration basic ventilation
Ventilation level 1
The system runs at ventilation
level 1
Ventilation level 2
The system is running in venti-
lation level 2
Ventilation level 3
The system is running in venti-
lation level 3
By selecting ventilation level3, you
activate the boost ventilation function.
After 1hour of operation at the highest
ventilation level, the system automati-
cally resets to the previous ventilation
level. Alternatively, by selecting a lower
ventilation level, you can end the boost
ventilation process manually before one
hour has passed.
Basic ventilation
The system runs with a mini-
mum amount of air. The fans
run at low speed.
sĞŶƚŝůĂƚŝŽŶůĞǀĞůƐ
On Off
Scheduler
Ventilation Level 1
sĞŶƚŝůĂƚŝŽŶůĞǀĞůƐ
On Off
Scheduler
Ventilation Level 1

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 16
USER GENERALSPECIALIST PERSONNEL
Higher-level ventilation regulation
There are various configurations and op-
erating modes that result in your ventila-
tion unit being operated with air volumes
other than those set. These include:
CO2-controlled regulation (Figure 1)
Acceptable indoor air should not exceed
a CO2 value of 1000ppm, meaning that
active ventilation should take place every
1 to 2hours. A living room ventilation
unit with CO2concentration-based control
(CO2 sensor module available as part of
the accessories) automatically ensures
that a defined CO2 value of 900ppm is not
exceeded.
Humidity-controlled regulation (Figure 2)
The relative humidity is a factor that also
contributes significantly to a comfortable
living climate. Acceptable humidity is
defined by a comfort window.
In the case of a ventilation unit with
humidity concentration-based control (RH
sensor module available as part of the
accessories), a permanently defined rel-
ative humidity setpoint of 65% is stored. If
this value is exceeded, the ventilation unit
switches to the highest ventilation level for
60minutes.
Figure 1: Schematic diagram showing the increase in CO2concentration in a flat/room with occupants with
and without mechanical ventilation.
Ambient temperature in °C
Still comfortable
Comfortable
Uncomfortably dry
Uncomfortably damp
Based on Leusden and Freymark Graphics: www.komfortlüftunq.at
Relative humidity (RH) of the ambient air in %
Structural-physical upper limit
(condensate, mildew, etc.)
approx. 45% to 55%
Ideal 35% to 45% RH
Lower comfort limit for humans 20%
Figure 2: Representation of the comfort window as a function of the air temperature and relative humidity.
DEMAND-CONTROLLED AIR VOLUME
REGULATION

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 17
USER GENERALSPECIALIST PERSONNEL
TEMPERATURE
The main menu is opened by pressing
the Menu button. Information on the
ventilation unit is displayed here, and
various settings can be made and actions
performed.
The user is returned to the Start
menu by pressing the Home
button.
Depending on the setting, regulation is
based on the indoor air, extract air or
supply air temperature, the desired tem-
perature can be entered via the control
unit. For details see "Settings" under
"Temperature control” in section9.
Deactivated time program [OFF]
TARGET temperature in normal operation.
If the time program is deactivated, this is
always the set temperature.
Activated time program [ON]
(for dierent daily TARGET tempera-
tures)
TARGET temperature in normal operation
and in reduced operation.
If the time program is activated, the
system switches between these two
TARGET temperatures.
In the standard version of the
ventilation unit, the temperature
is controlled via the integrat-
ed bypass circuit and is limited by the
outdoor air conditions without the use of
the optionally available heating, cooling or
combination exchanger in the supply air.
dĞŵƉĞƌĂƚƵƌĞ
Scheduler
Normal operation control
On Off
Extract air
22.0 °C
MAIN MENU
dƵĞƐĚĂLJϮϲϬϱϮϬϭϴ
ϭϯϰϱ
DĂŝŶŵĞŶƵ
/ŶĨŽƌŵĂƚŝŽŶ
^ĞƚƚŝŶŐƐ
ĐƚŝŽŶƐ
dĞŵƉĞƌĂƚƵƌĞ
On Off
Scheduler
Normal mode
Reduced mode
22.0 °C
20.0 °C

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 18
USER GENERALSPECIALIST PERSONNEL
Current operating values, operating hours,
messages and firmware versions can be
retrieved under the [Information] menu
item.
Current operating values
Operating hours meter
Notifications
Current errors and error and filter logs
display here.
Current errors
Active errors are displayed here.
Error log
Here the last 100 errors are displayed in
historical order.
Filter log
The filter changes carried out are docu-
mented here.
Device information
Firmware versions for the control and the
operating unit as well as the type of ven-
tilation unit are shown here. The device ID
displayed is relevant for remote access
via the Internet (remote maintenance) or if
the Pichler app is used.
ƵƌƌĞŶƚĞƌƌŽƌƐ
EŽĞŶƚƌŝĞƐ
ƌƌŽƌůŽŐ
Ϭϰ –džƚƌĂĐƚ Ăŝƌ ĨĂŶ ĞƌƌŽƌ
ϬϮ –ŽŵŵƵŶŝĐĂƚŝŽŶ ĞƌƌŽƌ
Ϭϰ –džƚƌĂĐƚ Ăŝƌ ĨĂŶ ĞƌƌŽƌ
Ϭϱ –^ƵƉƉůLJ Ăŝƌ ĨĂŶ ĞƌƌŽƌ
ϭϲϬϱϮϬϭϴ
ϭϱϬϱϮϬϭϴ
ϭϰϬϱϮϬϭϴ
ϭϰϬϱϮϬϭϴ
ϬϵϮϬ
Ϭϵϭϱ
Ϭϵϭϱ
Ϭϵϭϭ
&ŝůƚĞƌůŽŐ
ŝƌĨŝůƚĞƌĐŚĂŶŐĞĚ ϭϲϬϯϮϬϭϴ ϬϵϮϬ
INFORMATION
/ŶĨŽƌŵĂƚŝŽŶ
Current operating values
Time meter
Notifications
Device information
ƵƌƌĞŶƚŽƉĞƌĂƚŝŶŐǀĂůƵĞƐ
^ƵƉƉůLJĂŝƌƚĞŵƉĞƌĂƚƵƌĞ
džƚƌĂĐƚĂŝƌƚĞŵƉĞƌĂƚƵƌĞ
KƵƚƐŝĚĞĂŝƌƚĞŵƉĞƌĂƚƵƌĞ
džŚĂƵƐƚĂŝƌƚĞŵƉĞƌĂƚƵƌĞ
^ƵƉƉůLJĂŝƌǀŽůƵŵĞĨůŽǁ
džƚƌĂĐƚĂŝƌǀŽůƵŵĞĨůŽǁ
džƚĞƌŶĂůKĨĨ
ŽŽƐƚǀĞŶƚŝůĂƚŝŽŶ
&ƌŽƐƚƉƌŽƚĞĐƚŝŽŶ
Ϯϯϱ°
ϮϱϬ°
ϮϯϬ°
Ϯϰϴ°
ϭϱϬŵϹŚ
ϭϱϬŵϹŚ
/ŶĂĐƚŝǀĞ
/ŶĂĐƚŝǀĞ
/ŶĂĐƚŝǀĞ
dŝŵĞŵĞƚĞƌ
EĞdžƚĨŝůƚĞƌĐŚĂŶŐĞ
sĞŶƚŝůĂƚŝŽŶůĞǀĞůϭ
sĞŶƚŝůĂƚŝŽŶůĞǀĞůϮ
sĞŶƚŝůĂƚŝŽŶůĞǀĞůϯ
ĂƐŝĐǀĞŶƚŝůĂƚŝŽŶ
ϳϯĚĂLJƐ
ϭϭϴŚ
ϮϭϳŚ
ϱϴŚ
ϭϮŚƌƐ
sĞŶƚŝůĂƚŝŽŶŵŽĚĞƚŽƚĂů ϰϬϱŚ
WƌĞͲŚĞĂƚŝŶŐĐŽŝů
LJƉĂƐƐ
ϬŚ
ϭϲŚ
EŽƚŝĨŝĐĂƚŝŽŶƐ
Current errors
Error log
Filter log
Device information
Control firmware
Display firmware
LG model
Device ID
Internet connection
IP address
1.0
1.0
350
123456789012
connected
192.168.0.13

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 19
USER GENERALSPECIALIST PERSONNEL
Volume flow per ventilation level
The volume flow can be set here for each
individual ventilation level.
Scheduler
Dierent settings can be made here for
ventilation levels and temperatures for
each day of the week.
Time program ventilation levels
A total of three switching times are avail-
able for changing to a dierent ventilation
level per day. With the button "Apply for all
days" the switching points of the currently
selected day can be applied to all other
days of the week.
Switch time for operation with ventilation
level3.
SETTINGS
^ĞƚƚŝŶŐƐ
Ventilation level
Scheduler
Temperature control
Additional functions ^ĞƚƚŝŶŐƐ-^ĐŚĞĚƵůĞ
Ventilation levels
Temperature
^ĞƚƚŝŶŐƐ
Date & time
Language
^ĐŚĞĚƵůĞͲǀĞŶƚŝůĂƚŝŽŶůĞǀĞů
Monday
at 06 00
Level 3
^ĞƚƚŝŶŐƐͲsĞŶƚŝůĂƚŝŽŶůĞǀĞů
Level 1 125 m³/h
Level 2 200 m³/h
Level 3 300 m³/h
Basic ventilation 50 m³/h
^ĞƚƚŝŶŐƐͲsĞŶƚŝůĂƚŝŽŶůĞǀĞůϭ
Setpoint 90 m³/h
^ĐŚĞĚƵůĞƌͲǀĞŶƚŝůĂƚŝŽŶůĞǀĞů
Monday
at 08:30 Level 1
at 18:00 Level 3
at 06:00 Level 2
Apply to all days
Zeitprogramm Lüftungsstufen
Montag
ab Uhrzeit 00
Stufe 3
06

OPERATING AND INSTALLATION MANUAL LG 740 PAGE 20
USER GENERALSPECIALIST PERSONNEL
Time program temperatures
A total of three switching times are avail-
able for changing to a dierent TARGET
temperature per day. With the button
"Apply for all days" the switching points of
the currently selected day can be applied
to all other days of the week.
Temperature control
Depending on the setting, control is based
on the room air, extract air or supply air
temperature.
Additional functions
The additional functions configured by
the specialist during commissioning
can be activated and deactivated here.
The prerequisite is the installation of the
optional sensors or the heating, cooling or
combination exchanger.
CO2control
Enables higher-level air volume flow
control depending on the measured CO2
concentration.
Humidity control
Automatically switches to
ventilation level3 as soon as the
measured relative humidity rises above
65%.
Heating coil
Enables the supply air to be reheated
after the ventilation unit. This function is
only available in winter mode.
Cooling coil
Enables the supply air to be cooled after
the ventilation unit. This function is only
available in summer mode.
When using a combination exchanger
(cooling coil that can also be used for
heating), the heating coil and the cooling
coil must be activated here.
Date & time
In this menu item date and time settings
can be selected.
Date
The current day and the current month
are set in the date field. The active field
has a white background. The value is
changed by pressing the [+] or [-] button.
The value is confirmed by pressing the
[OK] button.
^ĐŚĞĚƵůĞͲƚĞŵƉĞƌĂƚƵƌĞ DKEz
at 06:00 Normal
at 22:30 Reduced
--:-- --:--
Apply to all days
^ĞƚƚŝŶŐƐͲdĞŵƉĞƌĂƚƵƌĞĐŽŶƚƌŽů
Control Extract air
^ĞƚƚŝŶŐƐͲAdditional functions
CO2 control ON/OFF
Humidity control ON/OFF
Heating coil ON/OFF
Cooling coil ON/OFF
^ĞƚƚŝŶŐƐͲĂƚĞΘƚŝŵĞ
Date
Time
^ĞƚƚŝŶŐƐͲĂƚĞΘƚŝŵĞ
Date
Year
19 05
2018
^ĞƚƚŝŶŐƐͲĂƚĞΘƚŝŵĞ
Date
Year
19 05
2018