LTG FVS Eco2School User manual

Translation of Original Installation/Use/Maintenance Instructions
LTG Air-Water Systems
AIR TECH
SYSTEMS
Decentralized Ventilation Units
FVS Eco2School
Installation below/in the ceiling

© LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany FVS-eng-BA (08/17)
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Translation of Original Installation/Use/Maintenance Instructions
Decentralized Ventilation Units FVS Eco2School
LTG Comfort Air Technology
Air Diffusers
Air Distribution
Air-Water-Systems
Content Page
0. EG-Declaration of conformity 3
1. Safety instructions 4
1.1 Explanation of symbols and hints 4
1.2 Operating safety instructions 5
2. Transport, storage, delivery 6
2.1 Transport instructions 6
2.2 Storage 6
2.3 Delivery 6
3. Function 6
3.1 Controller operational mode 7
3.2 Intended use 10
3.3 Notes for users 10
4. Technical data 10
4.1 Ventilation unit 10
4.2 Re-heater 11
4.3 Re-cooler 13
5. Installation 14
5.1 Installation notes 14
5.2 Suspension of the unit 15
5.3 Connection to the facade 28
5.4 Electrical connections 32
5.5 Inspection after installation 37
6. First use 38
6.1 Function test 38
6.2 Alarm, malfunctions 38
7. Operation, maintenance, repair 40
7.1 Opening the unit 40
7.2 Filter change 41
7.3 Cleaning and removal of the heat
recuperator
41
7.4 Cleaning the surfaces and fans 44
7.5 Intervals for hygiene inspection and
cleaning
44
7.6 Repair, replacing a fan 44
7.7 Repair, replacement of the spring
return drive
44
7.8 Repair, exchange heat recuperator
bypass flap
45
8. Spare parts, accessories 45
9. Decommissioning, disposal 45
Notes
Dimensions stated in this brochure are in mm.
Dimensions stated in this brochure are subject to
General Tolerances according to DIN ISO 2768-vL.
For the outlet grille special tolerances stated in the
drawing apply.
Straightness and twist tolerances for extruded alu
minium profiles according to DIN EN 12020-2.

© LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany FVS-eng-BA (08/17)
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Translation of Original Installation/Use/Maintenance Instructions
Decentralized Ventilation Units FVS Eco2School
0. EG-Declaration of conformity

© LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany FVS-eng-BA (08/17)
Tel. [phone] Fax [phone] [e-mail] www.LTG.net
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Translation of Original Installation/Use/Maintenance Instructions
Decentralized Ventilation Units FVS Eco2School
1. Safety instructions
Assembly, dismantling and mainte
nance must be performed by trained
personnel in order to achieve reliability,
safety and best results.
1.1 Explanation of symbols and hints
Operating safety symbol
This symbol is placed alongside every op
erating safety instruction in these operat
ing instructions, wherever there is a dan
ger to life and limb. Observe these in
structions and in such cases proceed
with extreme caution. Pass on all the op
erating safety instructions to otherusers.
In addition to the instructions contained
in these operating instructions, the gen
erally applicable safety and accident pre
vention regulations must be observed; as
shown here, for example: Warning of haz
ard point.
Information symbol
This information symbol is placed along
side those points in the manual which
must be specifically observed in order to
ensure that the guidelines, regulations,
instructions and correct operating se
quences are observed and to prevent
damage to or destruction of the unit and/
or other components in the system.
These mandatory symbols are linked to
the operating safety instructions and
show which protectivemeasures must be
complied with at the appropriate work
stations and therefore specifically man
date a certain action, as shown here as an
example: Wear protective gloves.
These prohibition symbols are linked to
the operating safety instructions banning
a dangerous or risky action, as shown
here as an example: Do not touch.

© LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany FVS-eng-BA (08/17)
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1.2 Operating safety instructions
Carefully read the safety instructions before using any
LTG decentralized ventilation unit.
Always follow the safety instructions!
The units meet any pertinent safety standards.
The installation and maintenance of air
conditioning units may be dangerous be
cause of high pressures and electrical
components being alive. Therefore, the in
stallation, maintenance, and repair must
be performed by qualified and trained
staff only.
In particular electrical connections are to
be provided, removed, or modified by au
thorized persons only observing all rele
vant safety instructions.
Safety instructions in the technical docu
mentation and on unit labels must be fol
lowed at all times.
Do not open the unit for cleaning, mainte
nance, or repair and do not remove covers
and casings (air diffuser) unless all con
ducting lines have been completely dis
connected. Do not connect or remove the
plug-in connector when under tension.
Any work regarding the electrical equip
ment is to be performed by skilled and
trained staff only.Connections to themain
power supply and the safety earth termi
nal must be executed exactly as described
in the wiring diagram.
Electrical operation of the unit in a partly
disassembled condition or of individual
components is not permitted since earth
terminals might be interrupted.
During continuous operation
the motor may reach temper
atures of up to +65 _C. If nec
essary, allow the motor to
cool off or wear gloves.
Be careful when performing
work on the heat exchangers.
Blades and housing parts are
sharp-edged. Wear gloves dur
ing work and handling.
The standard version of the
heat exchangers is designed
for an operating pressure of
10 bar (test pressure 16 bar).
High water pressures may be
hazardous.
Higher operating pressures,
therefore, require LTG's ex
press permission. Wear
safety glasses.
Be careful when working overhead and pro
vide protection against parts falling from
above.
Keep objects and dirt from entering the im
peller. A damaged fan impeller or objects
being ejected by the impeller may be haz
ardous.
The casing on site also serves as a protec
tion and should be removed for mainte
nance and cleaning only.
Avoid any additional load to the unit or the
suspensions since stability might be in
sufficient.
The unit must be checked by an expert im
mediately
- if it has been mechanically damaged
- If it is suffering from a water damage,
- if the fan shows signs of damages
(imbalance, damage to the bearing or
motor),
- if the suspension or the casing show
clear signs of corrosion or ageing.
Do not put the unit back into operation be
fore all necessary maintenance and repair
has been performed!
Take the unit entirely off the main power
supply until all repairs have been com
pleted even if this might result in not being
able to operate undamaged units.
It is in any case imperative to take a dam
aged unit completely off the main power
supply!

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Decentralized Ventilation Units FVS Eco2School
2. Transport, storage, delivery
The unit requires dry and dust-free conditions during
transport, storage, installation, and operation.
Units are stacked on Euro or single trip pallets and se
cured with straps. Pallets may be moved using forklifts
or cranes.
Do not remove the packaging unless immediately prior
to installation on site to protect the unit from pollution
and damages.
LTG Aktiengesellschaft will not take re
sponsibility for any pollution of or dam
ages to the unit.
2.1 Transport instructions
Handle units appropriately and with care during trans
port.
The outer shells must not be stressed in transport.
Do not throw, let drop to the ground or bump into other
items or walls.
Make sure that units are safely fastened during trans
port and avoid damage through other items.
At manual transport, the individual units should be
movedwithanindustrialtruck.
The packaging is not weather-resistant.
2.2 Storage
Make sure that units are entirely protected against
weathering, humidity, and other adverse conditions that
might result in damages during storage.
The storage location must meet the following climatic
requirements: Temperature between +5 _C and +55 _C
with a relative humidity of 90 % max. (non-condensing).
2.3 Delivery
Standard units are normally delivered as follows:
- 2 or 3 FVS units on disposable pallet, pallet shrink-
wrapped, dimensions approx. 210 x 110 x 120 cm,
mass approx. 440 / 610 kg, outer service covers (3 per
device) to protect against possible damage in trans
port / suspension loosely enclosed
- 4 Compact silencers on disposable pallet,
Dimensions approx. 190 x 102 x 190 cm,
Mass approx. 364 kg, devices shrink-wrapped
- forFVS-S (forvisible installation)additionally one pal
let per device with dimensions 230 x 70 cm, mass ap
prox. 70 kg
- Assembly accessories (1 pallet per unit)
-Perdeviceunit2x4mmountingrails
- on Euro or singletrip pallets,secured with strapsand/
or with the pallet sealed in film.
- fitting/regular accessories packaged with them in
separate boxes
Disposal of the packaging material in accordance with
local regulations.
3. Function
The FVS is a CO2-controlled façade ventilation device
ready for installation for local ventilation and venting di
rectly through the façade, with
- direct façade connection, incl. outside/outlet air
- weather protection grids with aerodynamically sepa
rated exhaust routing
- highly efficient silencer for supply and exhaust air
- heat recovery and controllable secondary air opera
tion, without afterheating of the supply air in the unit.
Installation under ceilings, suitable both for visible in
stallation and for integration into a ceiling cassette.
Low danger of freezing of the heat recuperator by con
trol of the supply air temperature via secondary air ad
dition. No de-icing from electrical pre-heatingof the out
side air required.
The outside air flow is cleaned through an F7 fine dust
filter and heated to the target supply air temperature by
a cross-counter-flow heat exchanger at low outdoor
temperatures. When the supply air temperature rises,
the supply air temperature controller opens the bypass
flap. Part of the outside air flow bypasses the heat recu
perator and thus reduces the supply air temperature in
order to cool the room.
A compact, highly efficient double silencer for supply
and exhaust air seals off the ventilation unit on the room
side. Formed parts in the air ducts that are connected to
the silencer permit line-bound air guidance with supply
and exhaust air diffusers without short circuiting the
flow.

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Decentralized Ventilation Units FVS Eco2School
3.1 Controller operational mode
Automatic mode
The standard is operation according to CO2 -demand.
If the factory-set CO2threshold is exceeded the ventila
tion will come on automatically.
If the factory-set CO2threshold is undercut, ventilation
stops (threshold may be changed through parameter
setting).
The system works independently without need of any
further operating elements.
Inputs for activation (see chapter 5.4)
AbridgeisplacedattheinputD1toMinthefactory.The
device works without connection of a CO2sensor in per
manent operation in operating mode "Com", conveying
600 m³/h air.
The following four inputs may be used for a central or
decentralized activation on site via button. The factory-
side bridge between the terminals D1 and M then must
be removed.
1. DI 1 Ventilation mode „Com“ (factory-side bridge)
Mode activation with 100 % nominal flow rate (fac
tory-set to 600 m3/h, nominal value parameteriz
able). Ventilation starts if the CO2threshold is ex
ceeded (see CO2-controlled operation). With no CO2
sensor connected the unit will operate continuously
(mode „Com“, independent of CO2value).
The operating modes "Com" and "Eco" are only re-
leased by the device when:
- the exhaust air temperature (room air tempera
ture) is higher than the set parameter "Limit AB" =
+15 °C (factory-side)
-theCO
2concentration in the room exceeds the
threshold (at CO2-controlled ventilation mode, tar
get values CO2“Com” or “Eco” SW-ON = 1000 ppm)
2. DI 2 Ventilation mode „Eco“
Mode activation with 50 % nominal flow rate (fac
tory-set to 400 m3/h, nominal value parameteriz
able). Ventilation starts if the CO2threshold is ex
ceeded (see CO2-controlled operation). With no CO2
sensor connected, a bridge must be placed at the in
put D2 to M. The unit will operate continuously in
„Eco“ mode.
3. DI 5 Forced ventilation
If in the „Eco“ or „Com“ modes „forced ventilation“
has been activated, the CO2level inside the room will
be ignored. Pleasenote: Ventilation will continue un
til “forced ventilation” is deactivated or the mode of
operation changed. The operating modes "Eco" and
"Com" are only released by the unit when theexhaust
air temperature (room air temperature) is higher
than the set parameter "Threshold AB" = +15 °C (fac
tory-side).
4. DI 3 Nocturnal ventilation
In summer, discharge of the heat stored in the room
during the day can be supported by the operating
mode night ventilation. Night ventilation is only re
leased by the unit when the following conditions are
met:
- The exhaust air temperature exceeds the set
threshold (parameter "AB target" = +19 °C factory
side). If the exhaust temperature drops below the
set value, night ventilation is deactivated. Deacti
vation of night ventilation protects the room from
cooling out.
- The temperature difference between supply air
and exhaust air sensor exceeds the set parameter
(parameter "ΔZU/AB=2Kfactory-side)
- The minimum permitted supply air temperature is
reached (parameter "ZUmin" = +5 °C factory-side)
If the operating mode night ventilation is switched
on, the unit will check the existing conditions for ap
prox. 10 min (parameter "Kick duration" = 10 min in
the factory settings). If this inspection is not suc-
cessful, the operating mode night ventilation is
paused for a certain time (parameter "Kick pause" =
80 min in the factory settings). Then the unit will
check the conditions again.
If inspection is successful, the unit continues to run
until one of the above conditions is violated or the
operating mode is changed.
Night ventilation must not be used in winter, in order
to prevent cooling out of the rooms. If night ventila
tion is used in winter anyway, it is possible for the
room to cool down to thelimit of theexhaust temper
ature TAB = 15 °C. If this value is undercut, the device
will switch off and a malfunction message will be is
sued. The duration of the kick phase and kick pause
may need to be adjusted to the situation on site.
For system-related reasons, heating of the outside
air on theway to the room cannot beavoided. Thisef
fect must be considered in design of the night venti
lation and varies according to structure of the venti
lation system.

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Decentralized Ventilation Units FVS Eco2School
Continuation 3.1 Controller operational mode
Other modes on site
(factory-side bridge between D1 and M may need to be
removed):
- Decentralized via button
Manual on/off switch, selection of mode level; pro
longed operating times due to „not switching off“ may
be avoided by fixed operating times or central, sched
uled cutoffs; after switching off a ventilation follow-
up time is recommended to provide initial air quality.
In schools, unauthorized manipulation must be
avoided. It might not be possible to protect operating
units against vandalism.
- Central activation
of fixed & scheduled operating times
- Local Timer program (ZSP) on each unit
- Presence detector
With power-up delay and fixed operating time;
cuts off if time has elapsed without presence signal
(designed flow rate).
- Central control by GLT via a bus system (KNXS-mode,
BACnet, LON, Modbus-RTU (slave)). A list of the values
that canbe read/overwrittenis availablefrom LTG Ak
tiengesellschaft.
Temperature control
The FVS unit is not designed for controlling the room
temperature. It is equipped with a supply air tempera
ture control and a fixed target value (factory setting:
17 °C). Secondary air is added in order to prevent drop
ping to below the target value (see frost protection).
The room heating must take care of
re-heating to the target value of the
room temperature by thecorresponding
sizing.
Anti freeze
FVS without re-heater avoids freezing of the heat recu
perator by additionally monitoring the exit air tempera
ture. If the exit air temperature drops below a defined
temperature, secondary air will be added.
Condensate
Under certain operating conditions condensate forma
tionmaybeimpossibletoavoidduetohighheatreturn.
The unit is provided with a condensate drainage system
to be connected on site with the required slope or via
pump. Use a flexible condensate connection.
LTG system unit for operation without additional con
densate drain (optional)
Intelligent control means a condensate drain can be dis
pensed with.
Emergency shutoff (fire protection)
In caseof a powerfailure,the outsideairdamper willau
tomatically shut off the outside air and exit air opening
via spring return drive (running time 20 secs). In case of
a fire in the building, all units may be shut off at the fire
alarm centre. The circuit may also be interrupted by
smoke detectors.
Lead and follow-up times
When turned on, the unit will be operated for a parame
terizable lead time (factory-set to 60 secs) with the out
side air and heat recovery bypass dampers closed be
fore control obtains clearance. After 150 secs the
outside air damper is 100 % open. When turned off, the
unit is operated in the above condition for a parameteri
zablefollow-up time (factory-set to 180 secs) in orderto
allow humid filters and heat recoverers to dry.

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Continuation 3.1 Controller operational mode
The malfunction message must be acknowledged to
confirm elimination of the problem (see sector 6.2
„alarm, malfunctions“)
Malfunction indicator
The controller comprises of a malfunction indicator in
put in terms of a group alarm which is switched if the
following
occurs:
- Exhaust air temperature below limit
- Supply air temperature sensor fracture
- Exit air temperature sensor fracture
-CO
2sensor without signal, if connected
The malfunction message must be acknowledged to
confirm elimination of the problem (see chapter 6.2
„alarm, malfunctions“)
Parametrization via HMI module
(Human Machine Interface, optional)
Via service tool HMI the set operating modes, and set-
points may be indicated. Having entered your password
you may also use the service tool HMI to change control
parameters (after consultation with the manufacturer).
CO2-controlled ventilation ("Com" and "Eco")
Once the central ventilation mode has been activated,
the ventilation is started whenever a preset program
mable CO2 level (factory-set to 1000 ppm) is achieved
and again switched off when a lower preset limit (fac
tory-set to 800 ppm)is reached. The ventilation mode
uses a continuous outside air flow,depending on activa
tion based on DI 1 or DI 2 with full load or partial load
flow rates (with programmable levels). One or several
window contacts may be connected to the factory-
bridged connections M-D4 (N/C contact) and will dis
connect the unit as soon as the window is opened (fol
low-up time).
Control circuits
CO2-control circuit:
-CO
2is controlled (ventilation
as needed)
-Unit is connected/discon-
nected based on CO2
-T
ZU with lower limit at +17 °C
-Freezing (TFO limit) is
avoided
-Free cooling at night
-Optional: TZU cooling to
+17°Cinsummer(cooler)
Troom-control circuit
(optional):
-T
room is controlled
-External heating
valve controls
Troom
-Setpoint of
operating unit
Separate control circuits
Manual operation of ventilation mode
No CO2sensor connected. The unit is switched on/off
via button at „Com“ or „Eco“. Longer, uncontrolled run
ning times due to forgotten switch-off may be avoided
using central switch-off. Manual operation is not a stan
dard operating mode, therefore parametrization is re
quired.

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3.2 Intended use
The decentralized ventilation unit FVS is intended for
use in indoor rooms. It is approved for ambience condi
tions of +5...+40 °C with a maximum rel. humidity of
90 % (non-condensing).
In order to ensure safe motor functioning the ambient
temperature when installed should not exceed +40 °C.
Any other operating conditions require the express and
written permission of LTG Aktiengesellschaft.
LTG Aktiengesellschaft does not assume responsibility
for any damages resulting from unintended use.
3.3 Notes for users
Operation of the FVS unit with CO2sensor
The unit switches on self-operated when the specified
CO2activation concentration is reached; depending on
room size and occupation density this is 10...20 minutes
after lessons start.
The unit switches off when the specified deactivation
concentration is reached, i.e. it lags for 10...20 minutes
during breaks or after the end of lessons.
Ventilation and room temperature
The ventilation unit works independently from the room
heating. Control of the room temperature requires a
room heating system! The supply air is adjusted to a
fixed temperature of +17 °C via the heat recovery during
the heating period. This colder supply air flow is neces
sary to prevent rising of the room temperature through
the person heat.If thereare few persons, the room heat
ing must ensure the desired room temperature of, e.g.,
+21 °C using the thermostat valves.
The FVS unit does not switch on below a specified room
temperature of, e.g. +15 °C (cooling protection).
At outdoor temperatures > +17 °C, the supply air tem
perature will increase as well. Without mechanical re-
cooling (cold water circuit required) the room tempera
tures may slide above the outdoor temperatures due to
the heat load from persons and the sunlight
Room temperatures in summer can be limited by the
following measures:
- Use external sun protection in time and consistently
- Use the night ventilation via the unit or by window ven
tilation in summer
- Ventilate via the windows at the same time at low out
door temperatures. The FVS unit switches on auto
matically when the room air quality drops
Mechanical and free ventilation
At outdoor temperatures above +15 °C, tilted windows
can be used for concurrent ventilation. When no window
contact is connected, the FVS-device unit will switch off
on its own at good room air quality and thus save power.
4. Technical data
4.1 Technical data ventilation unit
(type FVS-DI, FVS-S)
Operating mode Eco Com Com
Bypass closed closed open closed *
V[m3/h] 400 600 680 730
LwA,1 [dB(A)] 33 39 39 42
LwA,2 [dB(A)] 38 44 47 47
LwA,3 [dB(A)] 51 61 61 66
LwA,3 [dB(A)]
with 500 mm
splitter
attenuator
45 55 55 60
Pel [W] 50 130 130 235
* Max. possible flow rate in the "Com" mode. This
application is possible using an internal program
adjustment.
LwA,1 Sound power level of radiated noise at the
sound absorber outlet for supply air and exhaust
air, with 3 dB absorption via diffusers
LwA,2 Sound power level of emission via casing,
3 dB sound absorption via ceiling panelling
Note: not applicable for visible installed units
LwA,3 Sound power level on the outside at the weather
protection grille for outside air and exit air,
without sound absorber
With average room absorption D1= 12 dB and damping
and absorption D2= 3 dB in the ceiling panelling.
Example for 600 m3/h:
Sum level LwA,1 +L
wA,2 =45dB(A),
Sound pressure LpA1+2 =45dB-12dB
= 33 dB(A) inside the room
Sound pressures LpA,3 of 4 units in the facade at a dis
tance of 10 m in front of the weather protection grille
(free field) with absorption D4:L
pA3 =L WA,3 -28dB;
Example for 600 m3/h with sum level 6 dB and
distance absorption 28 dB:
LpA,3 = 61+6dB-28dB =39dB(A)outside