Pichler LG 500 System VENTECH User manual

Systematic ventilation.
COMFORT
VENTILATION
EN13141-7:2010
EU Regulation
1253/2014
ErP
2018
The specified energy eciency
is applicable when controlled to
local requirements and is valid
up to the specified maximum air
flow volume.
OPERATING AND
INSTALLATION INSTRUCTIONS
SYSTEM VENTECH LG 500

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 2
1 Introduction Page 4
2 General Page 4
2.1 USE IN COMPLIANCE WITH THE INTENDED USE PAGE 5
2.2 LIABILITY PAGE 7
2.3 WARRANTY PAGE 7
3 Safety Page 7
3.1 SYMBOLS USED PAGE 8
3.2 SAFETY REGULATIONS PAGE 8
4 Functioning of the ventilation system Page 10
4.1 SYSTEM DESCRIPTION PAGE 10
4.2 POSSIBILITIES OF SYSTEM EXPANSIONS FOR FROST PROTECTION PAGE 11
4.3 SYSTEM EXPANSION FOR THE PURPOSE OF EXTERNAL AUXILIARY HEATING PAGE 15
4.4 VENTILATION UNIT PAGE 16
4.5 SAFETY DEVICES PAGE 20
5 Technical specifications Page 20
5.1 UNIT SPECIFICATIONS PAGE 20
5.2 CHARACTERISTIC EXTERNAL PRESSURE INCREASE -
AIR VOLUME FLOW WITH VOLUME FLOW CONSTANT FUNCTION PAGE 21
5.3 CHARACTERISTIC EXTERNAL PRESSURE INCREASE -
AIR VOLUME FLOW WITHOUT VOLUME FLOW CONSTANT FUNCTION PAGE 21
5.4 ACOUSTIC SPECIFICATIONS PAGE 22
6 Operator control unit Page 22
6.1 GENERAL INFORMATION PAGE 22
6.2 CONTROL UNIT KOMFORT-G PAGE 22
7 Power unit Page 28
7.1 CONFIGURATION AND DIAGNOSIS VIA THE PC SOFTWARE (ONLY FOR SPECIALIST INSTALLERS) PAGE 28
8 Messages /Faults Page 29
8.1 OPERATING MESSAGES ON CONTROL UNIT KOMFORT-G PAGE 29
8.2 MALFUNCTION MESSAGES ON CONTROL UNIT KOMFORT-G PAGE 30
9 Scope of delivery, transport, storage and disposal Page 30
9.1 SCOPE OF SUPPLY PAGE 30
9.2 TRANSPORT AND PACKAGING PAGE 31
9.3 STORAGE PAGE 31
9.4 WASTE DISPOSAL PAGE 31
Contents

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 3
10 Installation Page 31
10.1 PREREQUISITES FOR INSTALLATION OF THE UNIT PAGE 31
10.2 DEVICE INSTALLATION PAGE 32
10.3 ELECTRICAL CONNECTION PAGE 35
10.4 INITIAL STARTUP PAGE 42
11 Servicing and cleaning Page 43
11.1 SAFETY DIRECTIONS PAGE 43
11.2 CUSTOMER SERVICE PAGE 43
11.3 SERVICE INSTRUCTIONS FOR THE USER PAGE 43
11.4 SERVICE INSTRUCTIONS FOR THE SPECIALIZED INSTALLING COMPANY PAGE 44
12 Spare parts and accessories Page 48
12.1 CONTROL ELEMENTS PAGE 48
12.2 SYSTEM COMPONENTS PAGE 48
12.3 AIR FILTERS PAGE 48
13 Subject to change Page 48
14 Product fiche Page 49
15 EG-Konformitätserklärung (EC Declaration of Conformity) Page 51

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 4
1 Introduction
Dear customer, thank you for your deci-
sion to purchase the compact ventilation
unit LG 500 System VENTECH.
The compact ventilation unit LG 500 Sys-
tem VENTECH is a state-of-the-art de-
vice. Its convincing features are its high
degree of economy, operator friendliness
and operational safety.
To operate your compact ventilation unit
safely, properly, and economically, ple-
ase carefully read and comply with these
operating instructions.
Use the ventilation unit only in per-
fect condition, in compliance with the
intended use, in a manner that is safety
and danger conscious and in compliance
with all information provided in these
instructions. If you have any queries
or spare parts orders, please have the
device type and serial number (see type
plate on the device) at hand.
Please contact us if you have any further
queries or you have lost the documen-
tation:
2 General
This chapter contains general informa-
tion on the compact ventilation unit LG
500 System VENTECH with control unit
type KOMFORT-G.
READ THESE INSTRUCTIONS
CAREFULLY BEFORE INITIAL
STARTUP OF THE UNIT!
These instructions contain advice and
information about the safe operation,
installation, service and maintenance
of the compact ventilation unit LG 500
System VENTECH. It also serves as a
reference for service work so that this can
be performed in a responsible manner.
Please keep these operating instructions
in a safe place where they are always
accessible. Any troubleshooting or work
on the compact ventilation unit must only
be performed by an installation company
(specialists). We are continuously impro-
ving and developing our products. Your
device may therefore dier slightly from
the one referred to in these instructions.
Subject to change without notice:
These instructions have been drawn up
with the greatest care. However, no rights
may be derived from them.
We constantly make every eort to make
technical improvements to and optimiza-
tions of our products and reserve the right
to partially or wholly modify the units
or technical specifications without prior
notice.
For the compact ventilation unit LG 500
System VENTECH, our „General Terms
and Conditions“ in the applicable version
apply.
J. Pichler Gesellschaft m.b.H.
9021 KLAGENFURT
Karlweg 5, Postfach 32
T+43 (0)463 32769

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 5
The compact ventilation unit LG 500 Sys-
tem VENTECH, together with all the
optional system components cited in this
description, has been subjected by TÜV-
AUSTRIA Services GmbH, Testing, Inspec-
tion and Certification Centre/Vienna to a
safety test and inspection in accordance
with the relevant product requirements,
standards and directives.
The mark approval certificate No. 0010-
PS/PZW-EX-0067-2010 of 8 March 2011
and test reports No. 2010-PS/PZW-
EX-0067 and No. M/EMV-10/220 confirm
that the requirements of the relevant
test points with the optional system
accessories are met, on the condition
that the requirements of these operating
instructions are observed and adhered
to.
TYPEN
GEPRÜFT
TÜV AUSTRIA SERVICES GMBH
The compact ventilation unit LG 500 Sys-
tem VENTECH is intended for installation
into air treatments systems with an
adjustable air volume flow of 550 m³/h
for the controlled mechanical ventilation
of living areas and rooms with similar
purpose, such as seminar rooms and
small oces.
The entire living area is provided with
supply air and exhaust air ventilation by
installing a mechanical, controlled ven-
tilation system for apartments. In this
process there is a controlled air supply
with conditioned and filtered outdoor
air in the supply air zones. Odours and
humid indoor air are taken out of the
extract air zone.
The purpose of the controlled mecha-
nical ventilation of living areas is to im-
prove air quality and to reduce heating
requirements through the use of a highly
ecient heat recovery system as well as
influencing indoor air humidity.
The application range and intended use
of the device is limited to use in indoor
air treatment systems for exhausting
consumed air and supplying fresh,
temperate outdoor air at a maximum
conveying temperature of -15 °C to
+35 °C:
In addition, the conveyed air must be
free of aggressive vapours and wear-
inducing materials. Any other application
shall be deemed to be diverting from
the intended use. The manufacturer
shall assume no further liability for any
damages or consequential damages
resulting from non-intended use.
Intended use also includes observing
our prescribed operating and installation
instructions. This unit, which is acces-
sible for the general public, is intended
for installation in residential or com-
mercial buildings. The device is used for
mechanical ventilation of indoor air and
also for air reheating in conjunction with
a heater battery.
This device is not intended to be used by
people (including children) with limited
physical, sensory, or mental capabilities
or with a lack of suitable experience
and/or knowledge, unless supervised
by a person who is responsible for their
safety or from whom they receive inst-
ructions on how to use the device.
The unit is not suitable for installation
in the open air and must be installed
in suitable and temperature-controlled
indoor rooms.
2.1 USE IN COMPLIANCE WITH THE
INTENDED USE
2.1.1 Intended use

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 6
The ventilation unit is not suitable for
drying out new-build properties. When
the device is shut down, ensure that no
air circulation can occur through the
device.
The compact ventilation unit LG 500
System VENTECH is not a ready-to-use
product. It must not be put into operation
until it has been properly installed and
connected in the indoor air treatment
system. Only qualified, assigned person-
nel may work on and with the device.
Any individual who transports,
sets up or works on the device
must have read and understood
these operating instructions,
particularly Chapter 3 „Safety Instruc-
tions“. In addition, the end user has to
be informed of any dangers that might
occur.
Safety instructions and standards must
be observed when using the device
simultaneously with fireplaces consu-
ming indoor air. In the case of indoor air
dependent fireplaces the combustion air
supply for the fireplace has to be provi-
ded separately.
Proper operation of ventilation systems
based on the central “Compact venti-
lation unit LG 500 System VENTECH”
ventilation system requires that existing
combustion air or waste gas ducts are
isolated from heating systems depen-
dent on room air.
The ventilation unit LG 500 System
VENTECH may only be installed in
rooms, apartments and user units of
a comparable size in which indoor air
dependent fireplaces are installed, if the
simultaneous operation of indoor air de-
pendent fireplaces for liquid or gaseous
fuels and of the apartment’s ventilation
system is prevented or the exhaust gas
conveyance of the indoor air dependent
fireplace is monitored by special safety
devices.
If the negative pressure in the room
where the fireplace is installed is 4 Pa
greater than the external pressure, it
must be ensured that the extract air
system switches o automatically and
reliably. In such cases, the input „E3 fire-
place mode“ provided for this purpose
can be used. When the contact is closed,
the ventilation unit is switched o imme-
diately and „fireplace mode“ is displayed
on the control panel. When the contact is
opened, the ventilation unit returns to its
original state.
2.1.2 Stipulations for operation with
fireplaces
On account of the heavy load and irre-
gular operation the extract air of any
kitchen extractor hood present must
not be integrated into the apartment’s
ventilation system. The extract air from
such extractor hoods should be removed
separately out of the roof via an exhaust
air line. The supply air is provided sepa-
rately, e.g. via the window ventilation.
If an extractor hood is being operated
without separate introduction of the
supply air, the air volume balance in the
apartment is no longer balanced and the
proper functioning of the apartment’s
ventilation system is not ensured (odour
entrainment etc.). One possibility is to
operate the extractor hood with adequa-
te air filtering in recirculated air mode.
2.1.3 Stipulations in connection with
extractor hoods

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 7
The compact ventilation unit LG 500 Sys-
tem VENTECH has been developed and
manufactured for use in the controlled
mechanical ventilation of living areas
and rooms with a similar purpose, such
as seminar rooms and small oces.
Any other use is considered to be an
improper use and can lead to personal
injury or damage to the compact ventila-
tion unit LG 500, for which the manufac-
turer cannot be held liable.
In the event of the following the manufac-
turer is liable for no damage whatsoever:
• non-compliance with the safety, ope-
rating and servicing instructions listed
in these operating and installation
instructions
• the installation of replacement parts
that are not supplied by the manufac-
turer, whereby the responsibility for the
use of such replacement parts lies com-
pletely with the system installer/fitter.
• normal wear
2.2 LIABILITY
The warranty begins with initial startup,
at the latest, however, one month after
delivery has taken place. The warranty
covers the pure replacement of materi-
als only and does not include any claims
for the compensation of services. It
applies only if there is proof of appropri-
ately performed servicing in accordance
with our regulations and by a licensed
company that specializes in installation
work.
The warranty claim extends for a maxi-
mum period of 24 months after instal-
lation of the compact ventilation unit LG
500 System VENTECH, however, up to a
maximum of 30 months after the date of
manufacture.
Warranty claims can be asserted only for
material and/or design defects that have
occurred during the warranty term. In the
case of a warranty claim, the compact
ventilation unit LG 500 System VENTECH
may not be removed without prior written
approval of the manufacturer. The ma-
nufacturer accords a warranty on spare
parts only if they have been installed
by an installer who is recognized by the
manufacturer.
The warranty shall expire automatically at
the end of the warranty period, or in the
case of improper operation, such as ope-
rating without filters, installation of parts
not supplied by the manufacturer, or whe-
re non-approved changes or modifications
have been made to the system.
Failure to comply with these Operating
and Installation Instructions will automati-
cally void all warranties.
2.3 WARRANTY
3 Safety
Read these operating and installation
instructions carefully and observe the
safety instructions for installation work,
commissioning or for general work or
maintenance performed on the device.
Retain these operating and installation
instructions during the entire service life
of the device and keep them in an easily-
accessible location for future reference.
The safety instructions, warnings, com-
ments and directions described in these
operating instructions must always be
observed.
The specifications stated in this docu-
ment may not be modified.
Non-observance of these safety ins-
tructions, warnings, comments and
directions can result in physical injury or
damage to the compact ventilation unit.
We recommend purchasing a mainte-
nance contract to ensure that the device
is inspected and maintained at regular
intervals. Your supplier can provide you
with the addresses of approved specia-
lists/installers in your area.

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 8
3.1 SYMBOLS USED The following safety symbols indicate
text passages that warn against dangers
and sources of danger. Please familiari-
se yourself with these symbols!
Caution/Important information!
Caution! The non-observance of
this warning can lead to injury
or danger to life and limb and/
or damage to the unit.
Caution - dangerous electrical
voltage! The non-observance of
this warning can lead to injury
or danger to life and limb.
Installation, commissioning,
maintenance, and repair must
be performed by an authorised
specialist (heating specialist
firm/installation specialist firm).
The local national regulations and stan-
dards apply without restriction beyond
these operating installation instructions
in respect of operation of the device.
Ensure that your system installer/fitter
shows you how to operate the device
and the control unit after installation.
Use of the ventilation unit may only take
place in accordance with the use set out
in point 2.1 ‘Use in compliance with the
intended use`.
All safety and danger notices attached
to the device and described in these
instructions must be observed.
In the event of any malfunctions, shut
down the unit immediately and secure it
suitably against being switched back on.
Any malfunction of the device must be
rectified immediately.
After servicing and maintenance work,
the operating safety of the device should
be re-established by expert personnel.
The attachment or installation of additio-
nal parts and components is not permit-
ted. Any modifications or changes to the
compact ventilation unit LG 500 System
VENTECH are prohibited. Only original
replacement parts may be used. Modifi-
cations and adaptations to the ventila-
tion unit are not permitted and release
the manufacturer from any warranty and
liability. Make sure that children do not
play with the unit.
3.2 SAFETY REGULATIONS
3.2.1 General
The national and local regu-
lations must be observed for
installation and setup.
The unit must be installed only in com-
pliance with the national installation re-
gulations. Installation shall be performed
in accordance with the general, locally
valid construction, safety and installati-
on regulations of the appropriate local
authority or of the water and electricity
company and other institutions.
The unit may be installed only in frost-
free and dry rooms. The room tempe-
rature in the set-up room must have
a continuous temperature between a
minimum of +5 °C and a maximum of
+40 °C. The device is intended for free-
standing installation or wall mounting
and may only be set up when there is
suitable load-bearing floor or wall cons-
truction. No vibrations must be allowed
to aect the unit. A suitable water drain
with eective drain trap (siphon) must
be provided for discharging condensate
water accumulated during operation of
the device.
Installation work for the water, heating
and condensate water connections may
only be performed by a professional.
Proper installation is essential for ensu-
ring the water-tightness and eective-
ness of the condensate discharge line
and in order to prevent damage to the
building. The condensate drainage has
to be checked for operability by means
of an on-site inspection prior to initial
startup and after any servicing work.
3.2.2 Setting up the unit

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 9
• Warning: dangerous electrical
voltages!
• Failure to observe this risk
can lead to death, injury or
damage to property.
• Before carrying out any work on live
parts, the unit must always be dis-
connected completely from the power
supply (all poles) and secured against
being switched back on.
Work carried out on electrical connections
and electrical components of the unit and
its accessories may be carried out only
by authorised electricians in compliance
with the applicable law, requirements,
standards and directives.
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 electrical systems of the unit,
including their warning and protective
functions, shall be regularly checked
for perfect operation. The unit must be
shut down immediately in the event of
malfunctions or defects such as loose
connections or overheated cables.
Only original fuses with the prescribed ra-
ted current and dimensions may be used.
Damaged or faulty power supply cables
to the unit must be repaired immediately,
to avert potential danger. The unit may
not be operated unless safe operational
conditions have been restored.
Fault finding and immediate remediation
of electrical defects and malfunctions
shall be carried out by authorised electri-
cians only. All protective systems must be
checked (e.g. earth resistance etc.) after
completion of electrical work on the unit.
3.2.3 Electrical connections
The permitted maximum expectable load
has to be heeded for transportation of
the unit. System components of the ven-
tilation system, such as air lines, that are
installed in potentially unheated areas
must be suitably insulated to prevent
heat loss or condensate water formation
(where temperatures fall below the dew
point).
The locally-applicable construction and
fire prevention provisions, regulations
and standards must be adhered to. Ap-
propriate suitable measures for erection
of the unit, e.g. the installation of fire
dampers in air pipes etc., may have to
be taken.
Take into consideration the ambient
influences and do not install the venti-
lation unit in the vicinity of combustible
liquids or gases, in swimming pools
or in areas subject to the influence of
chemicals.
Potentially unsafe operations
are prohibited. To ensure
safe operation, never
remove or bypass safety devices.

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 10
Operation of the ventilation unit
is only permitted if all required
connections in conjunction with
the provided installed compo-
nents, such as sound absorbers etc.,
have been properly established.
Upon the occurrence of any defects or
damage that are able to injure people or
damage property, the system has to be
put out of operation immediately. Further
operation must be eectively prevented
until the device is completely repaired!
Where fault messages or damage
occur, the device must be immediately
switched o and disconnected from the
mains.
When opening the front covers or
removing cover plates, act in a safety-
conscious manner and be aware of
the risks. Every working method that
impairs safety is prohibited. Operation
of the device is only permitted with a
connected air line or installed system
components, such as sound absorbers,
with a minimum line length of 1000 mm
to ensure that the fans or electrical com-
ponents, for example, cannot be touched
by hand.
The ventilation unit must be operated
only in compliance with the project
documents. These must comply with the
equipment and product safety act and
with the relevant applicable stipulations
of the EC directives and standards.
Never operate the ventilation unit wit-
hout installed air filters. The air filters
must be checked regularly for conta-
mination and damage and cleaned or
replaced if necessary.
The air filters are to be replaced at least
every six months or when the „filter
change“ message appears on the control
unit. Use only genuine spare filters. If
the system is not in operation in the
summer, for hygienic reasons the air
filters have to be replaced before putting
it back into operation.
In case of simultaneous use of the ven-
tilation unit with fireplaces consuming
indoor air, the applicable safety instruc-
tions and standards must be observed.
In the case of indoor air dependent
fireplaces the combustion air supply has
to be provided separately. Advice on this
is provided under point 2.1.2 „Provisions
for operation with fireplaces“.
Owing to their heavy loading and irre-
gular operation, extractor hoods must
not be integrated into the extract air or
exhaust air circuit of the ventilation unit.
Advice on this is provided under point
2.1.3 „Provisions for use with extractor
hoods „. Exhaust air extractor hoods
must be operated via separate air lines,
with provision for a suitable fresh air
supply, e.g. by opening windows, or via
suitable air filters in recirculated air
mode.
3.2.4 Operation of the system
4 Functioning of the ventilation system
In the case of mechanically controlled
apartment ventilation the consumed,
humid extract air from the wet rooms of
the apartment, e.g. bathroom, toilet and
kitchen, is discharged and replaced by
conditioned, fresh and filtered outdoor
air in the residential areas such as the
lounge, bedrooms and other living areas.
High energy savings in the operation
of the ventilation unit can be realised
through needs-based system opera-
tion, the use of a highly ecient heat
exchanger for the recovery of heat from
the extract air into the supply air and
the use of energy-ecient fans with the
latest EC technology.
It should be particularly ensured that
the highly ecient heat exchanger is
protected against freezing via a suitable,
controlled frost-protection strategy and
that an eective condensate water out-
let, among other measures, is in place.
The more airtight the building shell and
the more eectively a house is insulated,
the more eective this technology is.
4.1 SYSTEM DESCRIPTION

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 11
The circuit diagram illustrates the fundamental
design of the domestic ventilation unit with the
optional additional system enhancements.
1 - Unit’s housing
2 - Supply air fan in EC execution
3 - Extract air fan in EC execution
4 - Outdoor air filter for fine dust F7 (optional as
pollen filter in quality category F9)
5 - Extract air filter G4 for coarse dust
6 - Counterflow heat exchanger
(optional enthalpy heat exchanger)
7 - Bypass flap
8 - Frost pre-heating for counterflow - heat
exchanger (optional)
9 - Condensate water tank with discharge and
drain trap (siphon) supplied by the customer
10 - Connection pieces for the ventilation unit
11 - Sound absorbers (optional) in the line system
12 - Switchable flap (optional)
13 - Re-heater battery design with warm water
(optional) with downstream supply air tem-
perature sensor
14 - Earth heat exchanger (optional)
15 - Suction element with pre-filter G4
16 - Heater, cooling battery for brine EHE (earth
heat exchanger) (optional)
Particularly in the winter
months, moderate to hea-
vy frosts can pose a risk of
freezing on the exhaust air side
of the heat exchanger depending on the
extract air temperature and extract air
humidity.
Where outdoor air temperatures fall to
approximately -3 °C, the heat exchanger
must be protected by suitable measures
against the formation of ice.
Various systems can be used for defrost
monitoring of the heat exchanger. Pos-
sible strategies to counteract freezing of
the heat exchanger are described below.
4.2 POSSIBILITIES OF SYSTEM
EXPANSIONS FOR FROST
PROTECTION
Outdoor air
Supply air
Exhaust ai
r
Extract air
+/-
Outdoor air
+
+
Bypass
GHE
5
4
8
2
3
1
6
7
9
14
15
12
12 16
13
11
10
15

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 12
Optimal frost protection in the presence
of cold outdoor air temperatures can be
realized by the integration of an earth
heat exchanger into the ventilation
system. Additional components, such
as a PTC pre-heater battery integrated
into the ventilation system, are then
unnecessary.
In summer mode, the cooling
eect of an earth heat ex-
changer is very limited and
barely noticeable for the user
due to the low air exchange.
The following information has to be
heeded for design of the earth heat
exchanger:
• Watertight pipes are laid underground
at frost-free depth, in consideration of
the cleanability of the system
• The design guidelines of the manufac-
turer have to be complied with
• Provision should be made for conden-
sate water discharge
• When taking air lines through exter-
nal walls, ensure an eective seal to
prevent the entry of moisture
• To avoid frost damage, a sucient
distance from other components such
as water pipes, foundations etc. has to
be maintained when laying
• In the event of polluted soil (e.g. radon
incidence) the possibility of indirect
preheating, e.g. a circuit system with a
frost protected heat transfer medium
should be used by preference
Earth heat exchangers must be carefully
planned and executed with respect to
their energy eciency and air hygiene.
The relevant directives and standards
have to be complied with.
In particular, among other things, atten-
tion has to be paid to easy cleanability
and a suitable filter concept.
EHE winter mode:
The earth heat exchanger is engaged via
the switchable flap when the outdoor air
temperature drops below the parame-
terized EHE winter threshold value. In
this case the outdoor air is drawn in via
the earth heat exchanger and preheated
in the process. If the outdoor tempera-
ture (optional sensor AI9 required) falls
below the parameter EHE-winter 6 °C,
the relay K8 switches on the earth heat
exchanger (EHE).
EHE summer mode
In the summer the earth heat exchanger
is engaged when the outdoor tempe-
rature rises above the parameterized
EHE summer threshold value. In this
case the outdoor air that is drawn in is
precooled via the earth heat exchanger.
If the outdoor temperature (optional
sensor AI9 required) moves above the
parameter EHE-summer 20 °C, the relay
K8 switches on the earth heat exchanger
(EHE).
An additional external outdoor
temperature sensor must be
installed outside. This sensor
is connected to the input AI9
(outdoor temperature) which is auto-
matically recognised by the controls.
The change-over valve (Fig 1 - Circuit
diagram of system components ref. 12)
is then regulated by this temperature
sensor.
4.2.1 Earth heat exchanger EHE
(factory settings)

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 13
In the winter, brine geothermal ener-
gy systems draw the energy from
the ground via a brine pipeline; in the
summer, the system can also be utilised
for cooling purposes. The heat or cold is
transferred indirectly to the supply air
via an external air register integrated
into the air line system.
Compared to other frost protection
strategies such as electric preheater
batteries or hot water preheater bat-
teries, brine earth heat systems have
the advantage that they can make do
with little energy when in operation. The
advantage in contrast to the air channel
earth heat exchanger lies in hygienic
aspects, the simpler layout and good
controllability.
In the event of polluted soil (e.g. radon
incidence) it is preferential to use indi-
rect preheating, e.g. a circuit system with
a frost protected heat transfer medium.
The design guidelines of the manufac-
turer have to be complied with. The
brine heater battery should be protected
against contamination via an external air
filter integrated into the air line system
with a filter quality category of at least
G4. The basic system components are
shown in the following diagram:
Brine pump controlled automatically
depending on outdoor temperature;
optional sensor AI9 required.
Brine earth heat winter mode:
If the outdoor temperature (optional
sensor AI9 required) falls below the
parameter EHE-winter 6°C, the relay K8
switches on the brine pump.
Brine earth heat summer mode:
If the outdoor temperature (optional
sensor AI9 required) exceeds the para-
meter EHE-summer 20 °C, the relay K8
switches on the brine pump.
An additional external outdoor
temperature sensor must be
installed outside. This sensor
is connected to the input AI9
(outdoor temperature) which is automa-
tically recognised by the controls. The
brine pump is then controlled via this
temperature sensor.
4.2.2 Brine geothermal energy with optio-
nal cooling function (factory setting)
Circuit diagram of brine geothermal energy with
optional cooling function

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 14
The ventilation unit LG 500 System
VENTECH can be optionally supplied with
an integrated electric PTC pre-heater
battery. If the optional pre-heater battery
is installed, the cold outdoor air is pre-
heated via the integrated electric PTC
pre-heater battery if there is a risk of
frost for the heat exchanger.
With this operating mode a
balanced air volume flow is
ensured between the supply air
and extract air for the defros-
ting time period!
Frost protection via integrated PTC pre-
heater battery:
• the temperature sensor AI4 (outdoor
air temperature in the unit) is relevant
for the de-icing function.
• the temperature sensor AI4 is posi-
tioned on the outdoor air inlet of the
heat exchanger.
• when the outdoor air inlet temperature
is below -3 °C and the outlet tempe-
ratures at the exhaust air sensor AI5
are below +5.5 °C, the PTC pre-heater
battery is enabled and Stage I of the
PTC pre-heater battery is switched on.
• the air temperature at the sensor AI4
is constantly regulated between 0.5 °C
and -2.5 °C.
• to achieve this, up to 6 dierent hea-
ting stages are switched on and o
automatically on the PTC pre-heater
battery, according to the outdoor air
temperature, via the control system.
• erroneous operation of the PTC pre-
heater battery is monitored via the
exhaust air sensor AI5
• the pre-heater battery is only enab-
led when the air temperature at the
exhaust air sensor AI5 falls below
+5.5 °C.
4.2.3 PTC low temperature preheater
battery factory setting
CAUTION: This operating mode is
not suitable for frost protection
in passive houses or buildings
with an air-tight design!
The compact ventilation unit LG 500
System VENTECH is equipped as stan-
dard with automatic frost-protection for
the heat exchanger by shutting down
the supply air fan while the extract air
volume flow remains constant. These
measures prevent the heat exchanger
from freezing. If, however, this opera-
ting setting does not achieve reliable
de-icing, the system will be shut down
for approx. 8 hours. The system will be
switched on again automatically.
To achieve reliable de-icing, a motorised
shut-o valve should be integrated into
the outdoor air line. This valve will be
controlled automatically via the controls
and prevent the possible entry of out-
door air. This function must be activated
via the PC software (see 7.1).
In this operating mode an equa-
lised air volume flow balance
between the supply air and
extract air during the period of
de-icing is not ensured!
Frost protection via extract air de-icing by
shutting down the supply air fan:
• the temperature sensor AI4 (outdoor
air temperature in the device) is rele-
vant for the de-icing function
• the temperature sensor AI4 is posi-
tioned on the outdoor air inlet of the
heat exchanger
• when inlet temperatures at the sensor
AI4 are colder than -3 °C and outlet
temperatures at the exhaust air sensor
AI5 are colder than +5.5 °C, the de-
icing cycle is enabled
• the de-icing process is only com-
menced when the temperature
dierence between the extract air and
supply air exceeds 6 °C.
• once the de-icing shutdown period (15
min) is complete, the supply air fan is
switched back on.
4.2.4 Anti-frost protection by shutting
down the supply air fan

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 15
4.3.2 Needs-based system operation -
CO2 control
In order to be able to increase the
air outlet temperature for the living
area further after the heat exchanger,
additional external heating can be
installed. This afterheating can be
achieved via an external warm water
heater battery integrated into the air line
system.
4.3 SYSTEM EXPANSION FOR THE
PURPOSE OF EXTERNAL
AUXILIARY HEATING
The supply air temperature can be in-
creased further via an external, optional
water re-heater battery and 3-point
mixer control, which is installed in the
supply air line downstream of the venti-
lation unit.
The set value for the temperature and
recording of the room temperature is
set via the KOMFORT-G control unit,
which has the room temperature sensor
integrated into it. The temperature set
value for the room temperature can be
set within a range of +10 °C to +35 °C. In
the „Service menu“ under Control, you
can select between room temperature
control and supply air temperature con-
trol (see point 6.2.5).
The mixer works in a clocked control
mode with PID control circuit. The
control parameters are factory set for a
mixer with a runtime of 120 seconds and
can be adjusted via the PC software (see
point 7.1).
This operating mode requi-
res an additional external
temperature sensor type
KTY8110, length 5 m (part. No.:
40LG040370) to be installed downstream
of the re-heater battery in the air line.
The sensor is connected to the input
AI6 (temperature sensor RHB (re-heater
battery)) and recognised automatically
by the the controls.
The supply air temperature is then cont-
rolled via this sensor.
If a warm water heater battery is con-
nected, the re-heater battery can be pro-
tected against risk of frost for additional
security via the potential-free input „E2“.
If this potential-free contact is closed
via an external temperature sensor,
which must be set to a trigger tempe-
rature of +5 °C, the ventilation unit will
emit a „Frost shutdown“ fault message.
This customer-supplied sensor is
positioned immediately in front of the
external heater battery in the air line
system. In this „frost protection“ fault
state, the mixer will be 100 % open and
the circulation pump activated. The fans
are switched o until the frost danger
message drops away again.
The same frost protection strategy is
also applied with a temperature of below
+5 °C at the integrated supply air sensor
AI3 or at the external supply air sensor
RHB.
4.3.1 With external warm water heater
battery (factory setting)
- - - - Notication - - - -
frost protection switched off
The air volume flow can be controlled
via optional accessories with surface-
mounted housing, the „CO2sensor
module“, the „humidity sensor module“,
the „CO2and humidity sensor module“.
Needs-based operation via the CO2and/
or humidity control sensor module only
functions in automatic mode and must
be activated via the PC software.
A maximum of 10 sensors can be
connected, with the highest value for
each fan speed is used.
The measured CO2 – and/or humidity-
concentration is used to regulate the fan
speed in accordance with the table. The
assignment of the fan speeds, the ppm
and humidity values can be changed via
the PC software.
14:30 Di 04.06.10
automatic mode
CO2 fan step II
ventilation 24 °C

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 16
The compact ventilation unit LG 500 Sys-
tem VENTECH is used for the controlled
mechanical ventilation of houses, larger
residential units, oces, surgeries and
similar applications.
The range of use extends fundamentally
to residential areas of 150 m² up to
approx. 400 m², with an adjustable air
volume flow up to 550 m³/h.
The compact ventilation unit LG 500
System VENTECH, consists of a compact,
heat bridge-free and heat-insulated
housing made from zinc-plated steel
plate, powder-coated exterior in RAL
9010, a highly ecient heat recovery
system with air/air counterflow heat
exchanger made from recyclable plastic
with an eciency level of approximately
92 %, an automatic 100 % bypass with
energy-saving radial fans in direct-cur-
rent technology and EC technology with
optional constant flow volume regulati-
on, air filters in quality category F7 in the
supply air and G4 in the extract air with
integrated, wired, control electronics and
an optional KOMFORT-G remote control
panel, for free-standing or wall moun-
ting in frost-free rooms.
• With PHI passive house certificate and
CH energy cluster declaration
• Ventilation unit with highly ecient
energy recovery
• Supply air and extract air fans with
energy-saving EC motors
• 4-stage fan operation without constant
volume flow function
• Optional with constant pressure con-
trol or electronic volume flow control
for constant air volume flow, adjustable
up to 550 m³/h. Even with changes in
the system pressure is the program-
med air volume flow maintained, for
example, if the filter is dirty.
• Needs-based air volume control via
CO2 sensor
• User-friendly KOMFORT-G control unit
with integrated room temperature
sensor
• Integrated 100 % bypass for bypassing
the heat exchanger in summer mode
• Selectable, automatically operating
frost protection switch for the heat
exchanger, optionally available with a
PTC low temperature preheater battery
• Filter monitoring integrated, upon at-
tainment of the time interval message
‘Filter change’ appears on the display.
• Simple filter change without tools
• Optional reheater battery for additional
raising of the room temperature
4.4 VENTILATION UNIT
4.4.1 Description
4.4.2 Advantages and features
When using humidity sensors the
priority can be selected on air quality
(factory setting) or humidity control
(regulation to set humidity) on the
control panel.
Example:
Sensors
adjustment
CO2-Sensor
0 - 2000
Humidity Sensor
0 - 100
CO2- and Humidity
Sensor
0 - 2000 / 0 -100
Measuring
sensor 1 1 2
Fan speed CO2in ppm Relative humidi-
ty in %
CO2in ppm/ Rela-
tive humidity in %
0< 400 < 25 on request
1401 - 600 26 - 35 on request
2601 - 900 36 - 50 on request
3901 - 1500 51 - 65 on request
4> 1500 > 65 on request

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 17
1. Operator control unit type KOMFORT-G
2. Power unit
3. Connecting lead J-Y(ST)Y2x2x0.8
4. Outdoor air filter of quality class F7
5. Extract air filter of quality class G4
6. Counterflow heat exchanger
(Optional: enthalpy heat exchanger)
7. Condensate tank with discharge fitting
8. Frost protection heating with a PTC low
temperature preheater battery (optional) 9.
Bypassklappe mit Stellantrieb
9. Bypass valve with actuator
10. Outdoor air and supply air fan
11. Exhaust air and extract air fan
12. Pressure sensor for volume flow constant
function (optional)
13. Exhaust-air-side sound absorber insert
(optional)
14. Front cover with a knurled screw fastener
15. Air line connection
16. Cable inlets
4.4.3 Layout of the unit
15
12
16
5
2
9
13
4
14
1
11 76
8
10
1. Operator control unit type KOMFORT-G
The KOMFORT-G control unit fitted
directly in the living area is used to
make settings for the ventilation unit.
The current operational statuses and
system values, e.g. operating mode, fan
speed, temperatures, etc., are shown on
the four-digit display. Operation (green),
faults and filter change (flashing red) are
displayed by way of signal lamps. Auto-
matic or manual mode can be selected.
In automatic mode the system operates
fully automatically in accordance with
programmable time programs, while
in manual mode the fan speed, for
example, can be increased individually
(air blast ventilation). The KOMFORT-G
control unit can also be used to make
individual operating parameter settings
during servicing work.
2. Power unit
The individual operating parameters are
set by the skilled installer or service
technician, matched to the relevant ap-
plication on site, via the power unit ins-
talled in the ventilation unit. The settings
can be made either via the KOMFORT-G
control unit or via the PC interface and
communication software.
3. Connecting lead J-Y(ST)Y2x2x0.8 (not
included in the scope of supply)
A screened cable J-Y(ST)Y2x2x0.8 is
required for communication between the
operator control unit and the power unit.
The connecting cable is not included in
the scope of supply. The cable length
must not be longer than 100 m. The plug
connection to the power unit and to the
operator control unit is by means of an
IDE connector.
4. Outdoor air filter of quality class F7
(optional pollen filter of quality class
F9)
The outdoor air filter removes dust and
contamination from the outdoor air.
5. Extract air filter of quality class G4
(optional F5)
Coarse contamination is filtered out of
the extract air via the extract air filter.
6. Counterflow heat exchanger
The highly-ecient heat exchanger
removes the energy content from the ex-
tract air and transfers this into the supply
air. Optional enthalpy heat exchanger
available.

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 18
7. Condensate tank with discharge fitting
Any condensate incurred in the heat ex-
changer during operation is collected via
the condensate trough. The condensate
incurred is discharged via the connected
condensate drainage system, which is
routed via an eective odour trap.
8. Frost protection heating with a PTC low
temperature preheater battery (optional)
In very cold outdoor air temperatures,
protects against freezing of condensate
in the heat exchanger. The outdoor air is
pre-heated, depending on the outdoor air
temperature, via the optional electrical
PTC low-temperature pre-heater battery.
If a water battery or brine batte-
ry is used for frost protection the
heat exchanger, the battery has
to be protected in a suitable way
against freezing when there is frost.
9. Bypass valve with actuator
In summer mode, enables the bypassing
of the air flow to the heat exchanger,
provided that the outdoor air temperature
is lower than the room temperature.
10.Outdoor air and supply air fan
Ensures the air volume flow for the supply
air; provides the living spaces with condi-
tioned outdoor air.
11. Exhaust air and extract air fan
Ensures the air volume flow for the
extract air; conveys the consumed air
externally out of the apartment.
12. Pressure sensor for volume flow cons-
tant function (optional)
Measured value sensor and pressure
sensors for the optional definable volume
flow constant function of the fans.
13. Exhaust-air-side sound absorber insert
(optional)
For noise reduction in the vicinity of the
exhaust air fan.
14. Front cover with a knurled screw
fastener
The front cover can be easily opened for
maintenance work to the device, e.g. filter
exchange. When closing it, make sure of
complete fastening and sucient seal
tightness between the front cover and the
unit’s housing.
15. Air line connection
Is for the purpose of connection to the
air line system. When installing, ensure
correct connection to the supply, extract,
outdoor air and exhaust air lines.
16. Cable inlets
Fundamentally the ventilation unit is sup-
plied electrically ready wired. The cable
inlets are used for making the electrical
connection, for connecting the operator
control unit and the optional system
accessories, for example, temperature
sensors etc.
4.4.4 Versions The compact ventilation unit LG 500
System VENTECH is available in several
dierent versions:
• right-hand or left-hand, depending on
the location of the supply air connec-
ting piece,
• with or without electrical PTC pre-hea-
ter battery integrated into the ventila-
tion unit for frost protection of the heat
exchanger
the device may also be optionally
equipped with the following additional
functions:
• pressure sensor technology for volume
flow or pressure constant function
• exhaust-air-side sound absorber insert
• needs-based ventilation operation via
CO2 sensor

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 19
4.4.5 Dimensions Illustration with optional PTC low-
temperature pre-heater battery, sound
absorption unit for exhaust air side
and pressure sensor for extract air and
supply air.
280
255
205
175
150 410 355
355 410 150
3
2
1
4
5
7
8
9
10
11
13
14
15
17
6
16
18
915
650
750
680
655
775
80
315
640
12
Für Prospekt LG500:
B x H x T = 915 x 855 x 655 mm
Version Right-hand version Lefthand version
Item no. without integrated PTC
pre-heater battery
08LG500-R 08LG500-L
Item no. with an integrated PTC
preheater battery
08LG500-RV 08LG500-LV
Optionally with an enthalpy heat
exchanger for moisture recovery
08LG500 + 08EWTLG500 08LG500 + 08EWTLG500
For standing or wall-mounted
installation
1
4
3
2
4
1
2
3
1
4
3
2
4
1
2
3
1 Supply air
2 Extract air
3 Outdoor air
4 Exhaust air
1 Supply air dia. 200 mm
2 Extract air dia. 200 mm
3 Outdoor air dia. 200 mm
4 Exhaust air dia. 200 mm
5 Counterflow heat exchanger
6 Extract air fan
7 Supply air fan
8 Control unit
9 Extract air filter G4
10 Outdoor air filter F7
11 Condensate trough
12 Condensate connector ø 15 mm
13 Cable entry 6 x M16
14 PTC electrical preheater battery (optional) 15 Sound
absorber insert for EHA
16 Height-adjustable feet
17 Supply air pressure sensor (optional)
18 Extract air pressure sensor (optional)
Illustration: LG 500-RV (right-hand version)

OPERATING AND INSTALLATION INSTRUCTIONS SYSTEM VENTECH LG 500 PAGE 20
Ventilation unit
Dimensions (w x h x d)
915 x 855 x 655 mm
Housing of single-shell construction
made of galvanized sheet steel, coated
in RAL 9010 – white Insulation 25 mm /
30 mm
Air line connection
4 x ø 200 mm
Condensate connection
ø 15 mm unten
Voltage / frequency / current
230 V/50 Hz/16 A
Degree of protection
IP 20
Permitted ambient temperature for unit
+5 °C bis +40 °C
permissible air temperatures
-15 °C bis +35 °C
Weight without accessories
ca. 75 kg
Operator control unit KOMFORT-G
Dimensions (w x h x d)
150 x 82 x 20 mm
Connecting cable to the power unit
Connecting cable to the power unit
Air filters
Outdoor air/supply air filter
Pocket filters quality category F7, optio-
nal quality category F9
Extract air filter
Pocket filters quality category G4
Fans (factory setting)
Fan speed Speed
I
Speed
II
Speed
III Speed IV
Air volume
flow [m³/h] 200 300 400 500
Output in
[W] with
external
50/100 Pa
50/65 80/100 130/155 210/235
Air volume flow setting range 150 to 550
m³/h, settable in increments of 5 m³/h.
Flow eciency in accordance with PHI
0.33 W/m³/h Power consumption in
standby mode 2.9 W
For the purpose of ensuring safe opera-
tion of the system the safety devices and
covers must not be put out of service,
bypassed or dismantled by any measu-
res.
The system must be shut down imme-
diately if faults or malfunctions occur in
the ventilation system that could pose a
risk to persons or property.
Further operation must be eectively
prevented until a complete repair has
been made! Repair may only be perfor-
med by a skilled installer.
Overheating protection. A
thermo bi-metal switch is built
in to protect the optionally-
integrated frost protection
heater battery from overheating. When
a temperature of +50 °C is reached, this
element interrupts the power supply to
the PTC electric heater battery.
4.5 SAFETY DEVICES
5 Technical specifications
5.1 UNIT SPECIFICATIONS