alphainnoTec GKA 6 User manual

We reserve the right to modify technical specifications without prior notice.
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
Operating Manual
FAN COILS
UK
for heating and cooling

2We reserve the right to modify technical specifications without prior notice.
Please read rst
This operating manual provides important information
on handling the unit. It is an integral part of the product
and must be kept ready to hand in the immediate vicin-
ity of the unit. It must remain available throughout the
entire service life of the unit. It must be handed over to
subsequent owners or users of the unit.
Read the operating manual before starting any work on
or with the unit. This especially applies to the chapter
on safety. Always follow all instructions completely and
without restrictions.
It is possible that this operating manual may contain in-
structions that seem incomprehensible or unclear. In
the event of any questions or if any details are unclear,
contact the factory customer service department or the
manufacturer's local partner.
As this operating manual has been written for sever-
al unit models, always comply with the parameters that
apply to the respective model.
This operating manual is intended only for persons as-
signed to work on or with the unit. Treat all constituent
parts condentially. They are protected by copyright.
No part of this manual may be reproduced, transmitted,
copied, stored in electronic data systems or translated
into another language, either wholly or in part, without
the express written permission of the manufacturer.
Symbols
The following symbols are used in the operating manu-
al. They have the following meaning:
Information for users.
Information or instructions for qualied per-
sonnel.
DANGER!
Indicates imminent danger resulting in se-
vere injuries or death.
WARNING!
Indicates a potentially dangerous situation
that could result in serious injuries or death.
CAUTION!
Indicates a potentially dangerous situation
that could result in moderate or slight inju-
ries.
IMPORTANT
Indicates a potentially dangerous situation,
which could result in property damage.
NOTE.
Emphasized information.
Reference to other sections of the operating
manual.
Reference to other documents of the manufac-
turer.

3
Contents
INFORMATION FOR USERS AND QUALIFIED
PERSONNEL
PLEASE READ FIRST..................................................................2
SYMBOLS .....................................................................................2
INTENDED USE..........................................................................4
DISCLAIMER................................................................................4
EC CONFORMITY .....................................................................4
SAFETY.........................................................................................4
CUSTOMER SERVICE ................................................................4
SCOPE OF DELIVERY ................................................................5
ACCESSORIES.............................................................................5
WARRANTY / GUARANTEE...................................................5
DISPOSAL ....................................................................................5
GENERAL.....................................................................................5
The fan coil ............................................................................5
CARE OF THE UNIT..................................................................6
Fan coil layout........................................................................6
INSTRUCTIONS FOR QUALIFIED PERSONNEL
INSTALL ATION ................................................................9
To be noted before installation ..........................................9
Removing the side panels ....................................................9
Mounting on the wall ..........................................................9
SYSTEM ACCESSORIES...........................................................10
Adjustable feet for floor installation (GKF) ...................10
Installation package (GKIP)...............................................10
Condensate pump (GKP)................................................... 11
CONNECTIONS.......................................................................13
Water connection...............................................................13
Insulating the hydraulic connections ...............................13
ELECTRICAL CONNECTION ...............................................14
Wiring the motor................................................................14
OPERATING SEVERAL UNITS ..............................................15
COMMISSIONING ...................................................................16
Outlet grille and fixing the covers ...................................16
Move the supply connections ...........................................16
MAINTENANCE .......................................................................17
Removing and cleaning the filter ......................................17
Dismantling the fan unit.....................................................17
Replacing the motor...........................................................18
Cleaning the condensate trays..........................................18
DISMANTLING .........................................................................18
TECHNICAL DATA ..................................................................19
Air supply .............................................................................19
Heating output at the three standard speeds ...............19
Cooling output at the three standard speeds................20
Pressure loss of the heat exchangers ..............................20
Water volume of the heat exchanger..............................20
Electrical data of the motors............................................20
Sound emission....................................................................20
MODELS AND SIZES ...............................................................21
Dimensions and weight ......................................................21
CONTROLLER DESCRIPTION..............................................25
TOP-2....................................................................................25
General functions: ..............................................................25
Operation:............................................................................25
DECLARATION OF CONFORMITY ...................................34
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.

4We reserve the right to modify technical specifications without prior notice.
Intended use
The unit is only to be used for its intended purpose. This
means:
•for heating.
•for cooling.
The unit may be operated only within its technical
parameters.
“Technical data” on page 19
Disclaimer
The manufacturer is not liable for any damage or loss-
es resulting from use of the unit which is not its intend-
ed use.
The manufacturer's liability also expires:
•if work is carried out on the unit and its compo-
nents contrary to the instructions in this operat-
ing manual.
•if work is improperly carried out on the unit and
its components.
•if work is carried out on the unit which is not de-
scribed in this operating manual, and this work
has not been explicitly approved by the manufac-
turer in writing.
•if the unit or components in the unit have been
altered, modied or removed without the explicit
written consent of the manufacturer.
EC conformity
The unit bears the CE marking.
“Declaration of conformity” on page 34.
Safety
The unit is safe to operate for its intended use. The con-
struction and design of the unit conform to current state
of the art standards, all relevant DIN/VDE regulations
and all relevant safety regulations.
Every person who carries out work on the unit must
have read and understood the operating manual before
starting any work. This also applies if the person con-
cerned has already worked with such a unit or a similar
unit or has been trained by the manufacturer.
Every person who carries out work on the unit must
comply with the relevant local accident prevention and
safety regulations. This applies in particular to the wear-
ing of personal protective clothing.
DANGER!
Risk of fatal electric shock!
All electrical connection work must be car-
ried out by qualied electricians only.
Before opening the unit, disconnect the
system from the power supply and prevent it
from being switched back on!
WARNING!
Qualied personnel only (qualied heating,
cooling or refrigeration engineer or electri-
cian) may carry out work on the unit and its
components.
Customer service
For technical information please contact your qualied
tradesman or the manufacturer's local partner.

5
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
Scope of delivery
•Fan coil
Accessories
(not included in scope of delivery)
•Condensate pump
•Installation package
•Adjustable feet
“System accessories” on page 10
Warranty / Guarantee
For warranty and guarantee conditions, please refer to
the purchase documents.
NOTE.
Please contact your dealer about all matters
concerning warranties and guarantees.
Disposal
When taking the old unit out of service, comply with
the relevant local laws, guidelines, directives and stand-
ards for the recovery, reuse, recycling and disposal of re-
sources and components of cooling equipment.
“Dismantling” on page 18
General
THE FAN COIL
The GK (fan coil) has been designed for space air condi-
tioning and can be used for heating and cooling. A fan
passes the air over the heat exchanger, through which
hot or cold water ows.
The fan coils provide:
·Three fan speed levels
·A controller that is able to independently dier-
entiate between heating and cooling by means
of a temperature sensor in the lamellar heat ex-
changer, and can control the fan's operating
speed manually and automatically.
·Room air cleaned by the intake lter
·Digital thermostat with large, backlit LCD display
and many additional functions
·2 point valve pre-installed in the factory for inter-
rupting the ow during standby
NOTE.
To achieve optimum operation of the fan coils it
is necessary to ensure that air can ow over the
whole surface of the heat exchanger.
NOTE.
The unit is protected against condensation.
Insulate feed, return ow and discharge on-site
so that they are vapour diusion tight.
IMPORTANT
The condensation trays should be checked for
dirt at least once a year (bacterial, germs and
mould growth caused by condensation pro-
duced) and if necessary cleaned.

6We reserve the right to modify technical specifications without prior notice.
Care of the unit
You can clean the outer surfaces of the unit with a damp
cloth and proprietary household cleaning products.
Do not use cleaning or care products that contain abra-
sives, acids and/or chlorine. Such products would irrep-
arably damage the surfaces and could also cause techni-
cal damage to the unit.
FAN COIL LAYOUT
1 Internal structure
2 Fan unit
3 Control box
4 Heat exchanger
5 Additional condensate tray
6 Removable grille
7 Metal cover
8 External side panels
9 Intake air lter
THE INTERNAL STRUCTURE
The inside of the unit consists of a zinc plated metal
sheet of 0.8 and 1 mm thick. On the back of the GK(R)
there are eyelets for xing the unit onto the wall.
The condensate collection tray can be dismantled sepa-
rately from the fan group for cleaning.
All components are insulated with reproof material.
THE HEAT EXCHANGER
The heat exchangers are made of aluminium lamellae,
which are xed onto copper tubes. The collection
devices have ½” GF connections. All heat exchangers are
subjected to leak testing up to 18 bar and are suitable
for a maximum operating pressure of 10bar.
The ribbed shape of the exchanger surface as well as the
counter ow of the heating and cooling uid compared
to the air ensure maximum eciency.
NOTE.
If the exchanger is operated with ow temper-
atures of < 18°C, condensation forms on the ex-
changer surface, which must then be removed
via a condensate line. This process removes
moisture from the room air (active cooling).
“Technical data” on page 19

7
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
THE FILTER
The intake air lter, made of nylon (lter class G1), is xed
to the underside of the unit by a slide-in metal frame.
On the one hand this prevents dirt from getting into the
unit and on the other it lters the convection air and
blows it back out dust-free.
NOTE.
Regular cleaning of the lter helps to ensure op-
timum function of the unit.
“Maintenance” on page 17
The lters are 195 mm high, while their lengths dier de-
pending on the convector size:
Size GK... 6 GK... 11 GK... 21
Length [mm] 510 510 770
THE COVERS
The covers are made of painted sheet metal or ABS plas-
tic. They are xed to the inside of the unit with screws
(standard colour, RAL 9010).
The convection grilles are also made of ABS plastic. In
order to achieve the best possible heat distribution in
the room, the lamellae determine the air direction.
On the sides of the convection grilles there are two
aps, on the one hand to provide access to the control
panel and the control box under it and on the other for
diverse hydraulic connections. The aps can be xed to
the cover using screws in order to prevent unauthorised
access (e.g. in schools, public places, etc.).
The re resistance class of the grilles and aps is UL94
HB.

8We reserve the right to modify technical specifications without prior notice.
FAN UNIT
The fan unit, consisting of a radial fan, electric motor
and a voltage transformer, is mounted on a baseplate,
with insulation to prevent structure-borne sound.
The motor (single-phase to 230V and 50 Hz) is equipped
with a capacitor and automatic thermal contactor (de-
gree of protection IP20).
The whole fan unit can be removed from the fan coil
easily and independently.
The following table gives the number of fans depending
on the models:
Size GK... 6 GK... 11 GK... 21
N° fan impellers 1 1 2
3 operating levels are available:
MIN minimum output Level 1
MED medium output Level 2
MAX maximum output Level 3
see sections: “Operating several units” on page
15, “Maintenance” on page 17
THE CONTROL BOX
Control (1) and terminal box (2) contain the TOP-2 con-
troller integrated in the side panelling.
The TOP-2 controller is pre-wired in the factory in the
plastic terminal box under it and does not have to be re-
moved during installation.
To move the boxes to the opposite side, the electrical
connections to the various components do not have to
be undone. A detailed description of how to move the
connections is also given in this operating manual.
“Electrical connection” on page 14 and “Move
the supply connections” on page 16
1 Control box
2 Terminal box
NOTE.
There is no terminal box in the slave fan coil. The
electrical wiring is in the control box.
ADDITIONAL CONDENSATE TRAY
The additional tray is supplied as a standard with all fan
coils and is made of ABS plastic. It is mounted on the
side of the fan coil with screws and should collect the
condensate produced at the hydraulic connections and
drain it into the main tray.
After installing the tray, check it for leaks.

9
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
Installation
TO BE NOTED BEFORE INSTALLATION
All fan coils are delivered packed in a cardboard box.
The sticker on the outside of the packaging identies
the model, size, t of the water connections to the fan
coil and all accessory parts contained in the packaging.
To avoid damage or contamination of the heat exchang-
er, the unit should not be unpacked until immediately
before installation. To remove the packaging, open the
underside of the box and pull it o from above. Follow-
ing installation, it is advisable to cover the fan coil with
the packaging until all construction work has been com-
pleted. Do this as follows:
FRAGILE
TOP
2
1
3
REMOVING THE SIDE PANELS
To remove the plastic housing on the side, proceed as
follows:
Open the plastic cover...
Undo the safety screws...
Carefully move the plastic sheet to the side while
slightly lifting the underside...
MOUNTING ON THE WALL
Before xing the unit onto the wall, check the following:
·the wall must be suciently load-bearing;
·the fan coil must be accessible on all sides for
maintenance;
·there must be no hanging objects or other items
in front of the unit, which could impede the air in-
let or outlet;
·air distribution must be possible in the whole
room.
Install the unit as follows:
Draw on the positions of the xing holes as shown
in the sketched example…
all dimensions in mm GK... 6 GK... 11 GK... 21
A558 558 818
B538 538 798

10 We reserve the right to modify technical specifications without prior notice.
NOTE.
Always maintain a minimum distance from the
wall at the side of 200 mm.
IMPORTANT
To ensure a correct air intake, the minimum
distance from the oor must be ≥ 200 mm.
NOTE.
Use the xings supplied with the unit for the in-
stallation. Special xings are required for light-
weight walls.
System accessories
ADJUSTABLE FEET FOR FLOOR INSTALLATION
GKF
The accessories consist of 4 parts: two support brackets
and two plastic elements, which extend the side proles
of the housing. The adjustable feet can be mounted on
all fan coils, among other things, to conceal electrical
cables and system pipes at the oor or on the wall as
well as the condensate drain. Unobstructed access to
the intake air lter must still be ensured.
Colour of the plastic elements: STD RAL 9002
Height from the oor: 100 mm
INSTALLATION PACKAGE GKIP
Flexible armoured conduits with a union nut in DN 15.
in mounted condition with additional condensate tray

11
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
CONDENSATE PUMP GKP
The pump is used to dispose of condensate if the waste-
water pipe is located higher. The condensate pump is
equipped with an alarm function and switches o the
GK(R) if the quantity of condensate produced is greater
than the quantity that can be removed.
CONDENSATE PUMP TECHNICAL DATA
Max. delivery rate: 8 l/h
Max. delivery head: 8 mWC
Max. intake depth: 2.5 mWC
Voltage: 230 V/50 Hz – 110 V
Max. power consumption: 10 W
1 Spacer 3 cm
2 Washers
3 Hose clips
4 Condensate pump
5 Condensate hose
6 Plastic hose 19 cm
7 Screws 3.9 x 50
CONDENSATE PUMP GKP INSTALLATION
INSTRUCTIONS
DANGER!
Risk of fatal electric shock! Before installing the
condensate pump, safely disconnect the system
from the power supply and secure it from being
switched back on!
IMPORTANT
Clean the condensate tray before installing the
condensate pump.
IMPORTANT
Install the condensate pump so that it is safe
from contact (touch).
IMPORTANT
Immersion or installation in wet rooms is not
allowed.
IMPORTANT
Do not insulate the pump.
Remove the condensate pump and the mounting
rail from the packaging…
1 Condensate pump
2 Mounting rail
Fix the condensate pump onto the side of the unit
on which the hydraulic connections are located…
First, screw the right side of the mounting rail onto
the unit…
Then push the condensate pump onto the mount-
ing rail…

12 We reserve the right to modify technical specifications without prior notice.
Align the condensate pump vertically and screw on
the left side of the mounting rail…
4
4) fermare
4) fix the
d
5) fissare
c
5b, 5c.
5) fix the
pictures 5
a
Fig.5a
la pompa
s
d
rain pump
c
on le viti
e
drain pum
p
a
, 5b, 5c.
s
carico con
d
to the rubb
e
e
i distanzia
p
to the fl
a
d
ensa all’a
p
e
r piece.
li la pomp
a
a
nk of the
f
Fig.5b
Fi
g
.
4
p
posito pez
z
a
scarico co
n
f
an coil w
i
4
z
o in gomm
a
n
densa al f
i
i
th the scr
e
a
.
i
anco come
e
ws and sp
a
F
indicato n
e
a
cers as i
n
F
i
g
.5c
e
lle foto 5a
,
n
dicated i
n
,
n
IMPORTANT
Install the condensate pump vertically as shown
(maximum tolerance range 15° in each direc-
tion).
Use the piece of tube supplied to connect the con-
densate pump to the end of the condensate tray's
drain pipe...
5
6) fissare il tubo diametro L=190mm allo scarico condensa usando le fascette stringitubo.
Fare riferimento alle figure 6a e 6b.
Verificare che non ci siamo strozzature nel tubo tali da impedire il deflusso della condensa.
6) fix the pipe L=190mm to the condense discharging pipe, using the hose clamps.
Refer to pictures 6a and 6b.
Verify that there are no bottlenecks in the pipe that may block the flow of condensate.
Fig.6a Fig.6b
7) collegare il tubo di mandata della condensa come indicato nella figura n.7.
Portare e fissare l’estremità libera del tubo nel punto di scarico, bloccare il tubo con delle fascette.
7) connect the pipe for the condense outlet as indicated in the picture n.7.
Bring and fix the free pipe end near the discharging point, remember to block the pipe using some
clamps.
Fig.7
5
6) fissare il tubo diametro L=190mm allo scarico condensa usando le fascette stringitubo.
Fare riferimento alle figure 6a e 6b.
Verificare che non ci siamo strozzature nel tubo tali da impedire il deflusso della condensa.
6) fix the pipe L=190mm to the condense discharging pipe, using the hose clamps.
Refer to pictures 6a and 6b.
Verify that there are no bottlenecks in the pipe that may block the flow of condensate.
Fig.6a Fig.6b
7) collegare il tubo di mandata della condensa come indicato nella figura n.7.
Portare e fissare l’estremità libera del tubo nel punto di scarico, bloccare il tubo con delle fascette.
7) connect the pipe for the condense outlet as indicated in the picture n.7.
Bring and fix the free pipe end near the discharging point, remember to block the pipe using some
clamps.
Fig.7
Use a hose (6 mm ø inside) to connect the discharge
side of the condensate pump to the wastewater
water pipe…
Carry out the electrical connection work. To this
end, rstly, plug the control cable connector into
the condensate pump…
Then feed the power cable through the cable duct
to the electrical switchbox on the other side of the
unit and connect the condensate pump as shown
in the terminal diagram.
1 Power cable connector
2 Cable duct
IMPORTANT
After installing, securely close the cover of the
condensate pump.

13
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
Connections
WATER CONNECTION
To achieve maximum heat exchanger eciency, always
note and follow the manufacturer's data on the side of
the fan coil (ow / return on the heat exchanger).
Mixing up the water connections would not impair op-
eration, but reduces the heat exchanger eciency.
The water connections (½” internal thread) are welded
directly onto the coil. The recesses on the sides of the in-
ternal structure are designed to ensure that it is not pos-
sible for the connections to twist. To prevent damage
(e.g. twisting o the connections on the heat exchang-
er), it is important to screw in the supply pipes carefully.
To prevent unnecessary energy losses due to circulation
in standby, the ow rate at the fan coil is interrupted by
a 2 point valve, similar to underoor heating. As soon as
there is a need for heating or cooling, the valve opens
and re-releases the ow.
More information on this is given in the System Accesso-
ries section of this operating manual.
NOTE.
The installation package available as accessories
is required for the hydraulic connection to the
heating and/or cooling system.
“Installation package (GKIP)” on page 10
“Fan convector installation package”
1 Flow
2 Condensate drain
3 Return
NOTE.
After the supply lines have been connected,
check all connections for leaks.
INSULATING THE HYDRAULIC CONNECTIONS
Insulate all connections vapour diusion-tight in
accordance with the relevant local standards and
guidelines.

14 We reserve the right to modify technical specifications without prior notice.
Electrical connection
WIRING THE MOTOR
The circuit diagrams apply to all fan coil sizes.
DANGER!
Risk of fatal electric shock! Electri-
cal connection work is to be carried
out by qualied electricians only.
Before opening the unit, disconnect the sys-
tem from the power supply and prevent it
from being switched back on!
The motor of the GKR 5 - 20 units is a single phase motor
with only one rotational speed. This is controlled by the
transformer.
The transformer has a terminal strip with eight termi-
nals, with which the motor supply and the conductor for
controlling the operating speed are wired.
Fan with transformer
see terminal diagrams
1 Connection with the controller
(neutral conductor, MIN, MED, MAX)
2 Motor connection
3 Capacitor
4 Energy-saving transformer
5 Protective conductor
Wiring the transformer with motor
The following table gives the letter symbols of the various connections to the electric motors and the colours of the
conductors for the various operating speeds:
Abbreviation Colour of the conductor Designation
alight blue Neutral conductor (joint)
bblack Maximum speed MAX
corange Medium speed MED
dred Minimum speed MIN
eyellow & green Capacitor connection
fyellow / green Protective conductor
gbrown & dark blue Motor connection
1 – Capacitor

15
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
TOP2
+
ELMZ
Master
ELMZ
slave 1
ELMZ
slave 2
ELMZ
slave 3
ELMZ
slave 4
ELMZ
slave 5
...
Operating several units
MASTER/SLAVE PRINCIPLE
ELMZ
The ELMZ is a unit for connecting several fan coils by ap-
plying the master/slave principle. The device consists of
three relays, one for each operating speed. The termi-
nal strips and the relays are mounted on a circuit board.
The max. power consumption of each motor must not
exceed 150W.
Contacts
·Nominal current 10 A (AC1)
·Nominal withstand current in AC1 2500 VA
Coil
·Nominal supply voltage 230 V
·Nominal output 1.5 VA
Comments
·Is only installed on the unit
·Terminals on the undersides for easy wiring
·Two-sided terminals for choosing
the optimum side for the wiring
IMPORTANT
All connections 230 V. Ensure in phase connec-
tion!

16 We reserve the right to modify technical specifications without prior notice.
Commissioning
Check the following before switching on the fan coil:
The unit must be connected to the building's earth-
ing system and appropriate electrical protection el-
ements must be installed (automatic circuit break-
er)…
The condensate drain line must be in working order
(for cooling at ow temperatures below 18°C)…
The air lter must be correctly installed…
The air outlet side must not be blocked or impaired
in any way.
NOTE.
Vent the lines before starting up the system!
All heat exchangers are equipped with a vent valve. The
vent plug is located on the left above the return connec-
tion of the heat exchanger.
OUTLET GRILLE AND FIXING THE COVERS
The grilles are latched into place on the unit. They only
have to be lifted up to remove them.
The fan coils are delivered with forward-facing venti-
lation slots made in the factory.. If the grille is rotated
through 180°, the air outlet switches from the front to
the rear.
For units in public places such as schools, libraries, shop-
ping centres, etc, it is possible to block access to the
switch box and the water connections with the help of
a screw.
1 Remove cover and screw
cover into this hole
MOVE THE SUPPLY CONNECTIONS
The structural circumstances on site may require the
supply connection side to be moved. In this case, pro-
ceed as follows:
Dismount the 2 point valve on the heat exchanger
Remove the temperature sensor in the heat ex-
changer and later guide it to its original position
from the opposite side.
Undo the retaining screws of the control box and
screw them into the openings provided on the op-
posite side. It is not necessary to open or discon-
nect the control box…
Undo the retaining screws of the terminal box and
use self-tapping screws to x it to the other side.,
Dismantle the access panels of the heat exchang-
ers…

17
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
Undo the screws in the heat exchanger and remove
the heat exchanger…
Break through the penetrations provided on the
side, rotate the coil through 180°, feed the connec-
tions through the exposed recesses and re-tighten
the heat exchanger screws…
Use sealing tape to close the previous openings…
Install the 2 point valve on the opposite side
Re-fasten the previously removed access panels...
If necessary, move the condensate drain to the
other side. Tightly seal old penetrations…
If necessary, install the additional condensate tray
(3) on the other side. Tightly seal old penetration.
1 Heat exchanger
2 Control box
3 Additional condensate tray
4 Terminal box (not in slave)
Maintenance
REMOVING AND CLEANING THE FILTER
To ensure proper eciency of the fan coil it is necessary
to check the lter for dirt at regular intervals and if nec-
essary to clean it.
NOTE.
In case of continuous operation the lter should
be cleaned once a month.
The lter can be cleaned carefully using a domestic vac-
uum cleaner or, in the case of heavy dirt and dust accu-
mulations, it can be washed out using lukewarm water
and a neutral cleaning agent.
It is removed from all models in the same way. To re-
move, push the rear upwards. This places both guide
rails in a sloped position and the lter can be removed
from the front.
NOTE.
The lter must be completely dry before it can
be placed back in operation.
Do not operate the fan coil without the intake
lter, as this causes the components to become
dirty (fan, heat exchangers) and may cause con-
taminated air to be blown out.
DISMANTLING THE FAN UNIT
The whole fan unit can be removed easily by undoing
both retaining screws in the sides of the fan coils and
pulling the unit out of its bracket.

18 We reserve the right to modify technical specifications without prior notice.
REPLACING THE MOTOR
MOTOR WITH ONE FAN IMPELLER GK... 6, GK... 11:
Proceed as follows:
Undo the stop screw of the fan impeller connected
to the motor shaft (using an Allen key with a su-
ciently long shank)...
Remove the screws with which the motor is xed to
the housing…
Remove the motor.
MOTOR WITH TWO FAN IMPELLERS GK... 21:
Proceed as follows:
Undo the stop screw of the fan impellers connect-
ed to the motor shaft (using an Allen key with a suf-
ciently long shank)...
Unscrew the housing from the fan unit bracket…
Pull the fan impellers and the housing o the motor
shaft…
Remove the motor from the fan unit's support
brackets.
CLEANING THE CONDENSATE TRAYS
CAUTION.
The condensate trays should be checked for
dirt at least once a year (bacteria, germs and
mould growth) and if necessary cleaned.
Dismantling
DANGER!
Risk of fatal electric shock!
Electrical connections may be installed only
by qualied electricians.
Before opening the unit, disconnect the sys-
tem from the power supply and secure it
from being switched back on!
WARNING!
Only qualied electrical technicians may dis-
connect the unit from the mains system and
de-install all electrical connections.
WARNING!
Only qualied heating or cooling system per-
sonnel may dismantle the unit from the sys-
tem.
IMPORTANT
Ensure the unit components are reused/recy-
cled or properly disposed of in accordance with
the relevant regulations, standards and direc-
tives.

19
83018200bEN – Translation of the operating manual © ait-deutschland GmbH
We reserve the right to modify technical specifications without prior notice.
Technical data
Supply 230 V – 50 Hz AC - output
Control range 5 - 30 °C
Adjustable neutral range 1 - 5 °C
Temperature sensor NTC 10k - 25°C -1%
Operating temperature limits (flow temperature) 5 - 50 °C
Operating humidity limits 10 - 90% RH
(in non-saturated room)
Degree of protection IP 40
Cooling/heating depending on the flow temperature Cooling < 25°C
Heating > 26°C
These temperature ranges can be
adjusted in the Service menu.
Maximum length of the input and sensor cables 50 m
Minimum cross-section 0.5 mm
Colour RAL 9002 (white)
HEATING OUTPUT AT THE THREE STANDARD
SPEEDS
The following table shows the heating output, ow rate
and the corresponding pressure loss of the fan coil at:
Room temperature 20°C - heating water 35 - 30°C
MAX MED MIN
GK... 6 Total output W930 810 590
Flow rate l/h 160 140 100
Pressure loss Pa 1740 1310 720
GK... 11 Total output W119 0 1030 750
Flow rate l/h 210 180 130
Pressure loss Pa 4030 3080 1700
GK... 21 Total output W2030 1770 1260
Flow rate l/h 360 310 220
Pressure loss Pa 4650 3580 1890
Performance data
The data in the following tables has been determined
with mounted covers, grilles and intake lters. The am-
bient temperature in each case was 20°C. The function-
al speeds of the fan are the three standard speeds: MED,
MIN and MAX.
AIR SUPPLY
GK... 6 GK... 11 GK... 21
MAX m³/h 300 300 530
MED m³/h 250 235 445
MIN m³/h 175 156 300
External pressure air side [Pa]
Type m³/h 010 20 30 40 50 60 70
GK... 6 MAX 300 277 251 222 190 151 101 –
MED 250 224 196 164 129 87 32 –
MIN 175 126 69 –––––
GK... 11MAX 300 247 210 177 146 114 76 –
MED 235 179 133 94 54 –––
MIN 156 86 42 –––––
GK... 21MAX 530 450 382 320 260 200 138 67
MED 445 363 290 224 164 109 57 –
MIN 300 203 128 71 27 –––

20 We reserve the right to modify technical specifications without prior notice.
COOLING OUTPUT AT THE THREE STANDARD
SPEEDS
The following table shows the cooling output, ow rate
and the corresponding pressure loss of the fan coil at:
Room temperature 26°C - cooling water 16 - 22°C
MAX MED MIN
GK... 6 Total output W370 340 290
Flow rate l/h 50 50 40
Pressure loss Pa 260 230 180
GK 11 Total output W520 480 380
Flow rate l/h 80 70 50
Pressure loss Pa 670 570 380
GK 21 Total output W820 740 590
Flow rate l/h 120 110 90
Pressure loss Pa 660 560 380
PRESSURE LOSS OF THE HEAT EXCHANGERS
The following diagram shows the hydraulic pressure
losses of the various heat exchangers. The data was de-
termined at an average water temperature of 10 °C. To
determine the pressure losses depending on the wa-
ter temperatures, the determined pressure loss can be
multiplied by the corresponding correction coecients
from the following table:
20
15
10
5
0
100 300 500
kPa
l/h
GK 11
GK 6 GK 21
Correction factor P 1.10 1.00 0.94 0.88 0.87 0.85
average water
temperature °C 010 20 30 40 50
Correction factor P 0.82 0.79 0.775 0.75 0.74
average water
temperature °C 60 70 80 90 100
WATER VOLUME OF THE HEAT EXCHANGER
Size GK... 6 GK... 11 GK... 21
Volume for one row 1 0.171 0.256 0.397
Heat exchanger rows 233
ELECTRICAL DATA OF THE MOTORS
The power consumption was determined at maximum
speed with grilles, cover, intake lter and static operat-
ing pressure zero (230 V / 50 Hz).
Size GK... 6 GK... 11 GK... 21
Power consumption [W] 34 47 67
Nominal current [A] 0.170 0.221 0.306
SOUND EMISSION
SOUND POWER PER OCTAVE BAND
The sound power levels of all fan coils tested were de-
termined at each fan speed in accordance with ISO 3741.
GK... 6 GK... 11 GK... 21
MAX 30.6 dBA
0.75 kW
34.6 dBA
1.2 kW
41.6 dBA
2.2 kW
MED 20.6 dBA
0.6 kW
28.6 dBA
1 kW
37.6 dB A
2.05 kW
MIN 18.6 dBA
0.5 kW
22.6 dBA
0.76 kW
23.6 dBA
1.26 kW
OTHER COMMENTS
·Automatic speed control
·Only for operation with 2 pipe systems (not
suitable for single pipe heating)
·Independent operating mode selection (heat-
ing/ cooling) based on the ow temperatures