alphainnoTec LW 140 User manual

UK
83054400fUK
Air/Water Heat Pumps
Indoor installation
Operating Manual
LW 140(L) – LW 251(L)

2Subject to change without notice | 83054400fUK | ait-deutschland GmbH
1 Please read rst
This operating manual provides important informa-
tion on the handling of the unit. It is an integral part of
the product and must be stored so that it is accessi-
ble in the immediate vicinity of the unit. It must remain
available throughout the entire service life of the unit.
It must be handed over to subsequent owners or oper-
ators of the unit.
Read the operating manual before working on or op-
erating the unit. This applies in particular to the chap-
ter on safety. Always follow all instructions completely
and without restrictions.
It is possible that this operating manual may contain
instructions that seem incomprehensible or unclear. In
case of questions or uncertainty, contact the factory
customer service department or the manufacturer’s lo-
cal service partner.
Since this operating manual was written for sever-
al di󰀨erent models of the unit, always comply with the
parameters for the respective model.
This operating manual is intended only for persons as-
signed to work on or operate the unit. Treat all con-
stituent parts condentially. The information contained
herein is protected by copyright. No part of this in-
formation may be reproduced, transmitted, copied,
stored in electronic data systems or translated into an-
other language, either wholly or in part, without the ex-
press written permission of the manufacturer.
2 Symbols
The following symbols are used in the operating man-
ual. They have the following meaning:
Information for uers.
Information or instructions for qualied
technicians.
DANGER
Indicates a direct impending danger result-
ing in severe injuries or death.
WARNING
Indicates a possibly dangerous situation
that could result in severe injuries or death.
CAUTION
Indicates a possibly dangerous situation
that could result in medium or light inju-
ries.
IMPORTANT
Indicates a possibly dangerous situation,
which could result in property damage.
NOTE
Emphasized information.
9Prerequisite for an action.
►Single-step instruction for action.
1., 2., 3., … Numbered step within a multi-step in-
struction for action. Adhere to the given se-
quence.
●List.
Reference to further information elsewhere
in the operating manual or in another docu-
ment.
€ENERGY SAVING TIP
Indicates suggestions that help to save en-
ergy, raw materials and costs.

3
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
Contents
1 Please read rst ............................................ 2
2 Symbols ........................................................... 2
3 Intended use ................................................... 4
4 Disclaimer ....................................................... 4
5 EC conformity ................................................ 4
6 Safety and Security ...................................... 4
7 Contact ............................................................. 6
8 Warranty / Guarantee .................................... 6
9 Waste disposal............................................... 6
10 Operating principle of heat pumps ........... 6
11 Area of utilisation ........................................... 6
12 Heat quantity recording ............................... 7
13 Operation ......................................................... 7
14 Care of the unit .............................................. 7
15 Scope of delivery .......................................... 8
16 Transport, installation, assembly .............. 8
16.1 Installation location ................................... 9
16.2 Transport to installation location ............... 9
16.3 Installation ............................................... 12
16.4 Mounting the air ducts ............................. 12
16.5 Installation / connection to heating circuit16
16.6 Condensate discharge ............................ 16
17 Pressure relief .............................................. 17
18 Overow valve ............................................. 17
19 Bu󰀨er tank ..................................................... 17
20 Circulating pumps ....................................... 17
21 Water heating ............................................... 17
22 Hot-water tank .............................................. 17
23 Electrical connections ................................ 18
24 Rinsing, lling and bleeding the system 19
25 Insulating the hydraulic connections ...... 20
26 Installation of the control element ........... 20
27 Installation and removal of the screen .. 21
28 Set the overow valve ................................ 22
29 Commissioning ............................................ 23
30 Maintenance of the unit ............................. 23
30.1 Annual maintenance ............................... 24
30.2 Cleaning and rinsing of unit components 24
31 Malfunctions ................................................. 24
31.1 Unlock the safety temperature limiter ..... 24
32 Dismantling ................................................... 25
32.1 Removal of the bu󰀨er battery .................. 25
Technical data / scope of delivery .................. 26
Performance curves .......................................... 28
LW 140(L) ......................................................... 28
LW 180(L) ......................................................... 29
LW 251(L) ......................................................... 30
Dimensional drawings ....................................... 31
LW 140 – LW 180 ............................................. 31
LW 140L – LW 180L ......................................... 32
LW 251 ............................................................. 33
LW 251L............................................................ 34
Installation plans ................................................. 35
LW 140(L) – LW 180(L)
Installation plan version 1............................. 35
Installation plan version 2............................. 36
Installation plan version 3............................. 37
Installation plan version 4............................. 38
LW 251(L)
Installation plan version 1............................. 39
Installation plan version 2............................. 40
Installation plan version 3............................. 41
Installation plan version 4............................. 42
LW 140(L) – LW 251(L)
Coastal installation ....................................... 43
Hydraulic integration .......................................... 44
LW 140(L) – LW 251(L)
Row tank ...................................................... 44
Separate bu󰀨er tank ..................................... 45
Legend Hydraulic integration ........................... 46
Terminal diagram ................................................ 47
LW 140(L) – LW 251(L) ..................................... 47
Circuit diagrams .................................................. 48
LW 140(L) ......................................................... 48
LW 180(L) ......................................................... 51
LW 251(L) ......................................................... 54
EC declaration of conformity ........................... 59

4Subject to change without notice | 83054400fUK | ait-deutschland GmbH
3 Intended use
The unit may be used only for the intended purpose.
That means:
●for heating.
● for heating hot water.
The unit may be operated only within its technical pa-
rameters.
 "Technical data / scope of delivery“, from
page 26
NOTE
Notify the responsible power supply company
of the use of a heat pump or heat pump sys-
tem.
CAUTION
The unit is not suitable for use in IT network
systems.
4 Disclaimer
The manufacturer will not be liable for damage result-
ing from unauthorized use of the unit.
The manufacturer’s liability will also be voided in the
following cases:
● if work is performed on the unit and its compo-
nents in a manner that does not comply with the
terms of this operating manual;
● if work is performed on the unit and its compo-
nents in an improper manner;
● if work is performed on the unit that is not de-
scribed in this operating manual, and this work
was not expressly approved in writing by the
manufacturer;
● if the unit or components in the unit are modi-
ed, redesigned or removed without the express
written permission of the manufacturer.
5 EC conformity
The unit bears the CE mark of conformity.
 “EC declaration of conformity", page 59
6 Safety and Security
The unit is safe to operate when used for its intended
purpose. The construction and design of the unit
conform to current state-of-the-art standards, all
relevant DIN/VDE regulations and all relevant safety
regulations.
The operating manuals supplied with the product are
intended for all users of the product.
The operation of the product via the heating and he-
at pump control and work on the product which is in-
tended for end customers / operators is suitable for all
age groups of persons who are able to understand the
activities and the resulting consequences and can car-
ry out the necessary activities.
Children and adults who are not experienced in hand-
ling the product and do not understand the necessa-
ry activities and the resulting consequences must be
instructed and, if necessary, supervised by persons
experienced in handling the product and who are re-
sponsible for safety.
Children must not play with the product.
The product may only be opened by qualied personnel.
All instructional information in this operating manual is
solely directed at qualied, skilled personnel.
Only qualied, skilled personnel is able to carry out
the work on the unit safety and correctly. Interference
by unqualied personnel can cause life-threatening
injuries and damage to property.
► Ensure that the personnel is familiar with the local
regulations, especially those on safe and hazard-
aware working.
► Only allow qualied personnel with “electrical”
training to carry out work on the electrics and
electronics.
► Only allow qualied, skilled personnel to do any
other work on the system, e.g.
● Heating installer
● Plumbing installer
● Refrigeration system installer (maintenance
work)
Every person who carries out work on the unit must
comply with the applicable accident prevention and
safety regulations. This applies in particular to the
wearing of personal protective clothing.
During the warranty and guarantee period, service
work and repairs may only be carried out by personnel
authorised by the manufacturer.

5
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
DANGER
Danger of fatal injury due to electric cur-
rent!
Electrical connections may be installed on-
ly by qualied electricians.
Before opening the unit, disconnect the
system from the power supply and secure
it from being switched back on!
Existing earthing connections within housings or on
mounting plates must not be altered. If this should nev-
ertheless be necessary in the course of repair or as-
sembly work:
► Restore earthing connections to their original con-
dition after completion of the work.
IMPORTANT
If using the unit in 3~230V systems, please
note that the residual-current circuit breaker
(RCCB) used must be AC-DC sensitive.
WARNING
Observe safety labels on and in the unit.
WARNING
Unit contains refrigerants!
Leaking refrigerant could result in person-
al injury or material damage. Therefore:
● Shut down unit.
● Notify the manufacturer’s authorized ser-
vice center.
IMPORTANT
For safety reasons:
Never disconnect the unit from the power
supply, unless the unit is being opened.
IMPORTANT
Install the heat pump only indoors and oper-
ate only with outside air as the heat source.
The air ducts must discharge into the open
air. Do not restrict or block the air ducts.
 "Dimensional drawings“, from page 31, and "In-
stallation plans“, from page 35, for respective
unit model
WARNING
Switch on unit only if air ducts are mount-
ed on the unit.
Take measures on the fan side to pre-
vent injuries from the rotating fan (above-
ground air duct discharge: below-ground
air-channel discharge: wire mesh grille –
accessories not included in scope of deliv-
ery).
IMPORTANT
The integration of the heat pump in ventila-
tion systems is not permissible. The use of
the cooled air for cooling purposes is not per-
mitted.
IMPORTANT
The ambient air in the location where the
heating pump is installed and also the intake
air which is used as a source of heat must not
contain any kind of corrosive components!
Components such as ammonia, sulphur,
chlorine, salt, sewer gas, ue gases etc. may
cause damage leading to complete failure or
even a total write-o󰀨 of the heating pump!
WARNING
In the air outlet area the air temperature is
ca. 5 K below the ambient temperature. Un-
der certain climatic conditions, therefore,
an ice layer can form in the air outlet area.
Install the heat pump so that the air blower
does not blow in the direction of footpaths.
Decommissioning / draining the heating
If the system/heat pump is decommissioned or drained
after already being lled, it must be ensured that
the condenser and any heat exchangers have been
drained completely in the event of freezing tempera-
tures. Residual water in heat exchangers and con-
densers can result in damage to the components.
1. Completely drain the system and the condenser,
and open vent valves.
2. Blow them clear with compressed air, if required.

6Subject to change without notice | 83054400fUK | ait-deutschland GmbH
7 Contact
Addresses for purchasing accessories, for servicing or
for answers to questions about the unit and this oper-
ating manual can be found on the internet and are kept
up-to-date:
● Germany: www.alpha-innotec.de
● EU: www.alpha-innotec.com
8 Warranty / Guarantee
For warranty and guarantee conditions, please refer to
the purchase documents.
NOTE
Please contact your dealer concerning war-
ranties and guarantees.
9 Waste disposal
When decommissioning the unit, always comply with
applicable laws, directives and standards for the re-
covery, recycling and disposal of materials and com-
ponents of cooling units.
 “32 Dismantling", page 25
10 Operating principle of heat
pumps
Heat pumps operate on the principle of a refrigera-
tor: the same technology, only with the opposite e󰀨ect.
The refrigerator extracts heat from foods, which is re-
leased into the room through ns on the back.
The heat pump extracts heat from our environment:
air, earth or ground water. The extracted heat is con-
ditioned in the unit and supplied to the heating water.
Even when it is extremely cold outside, the heat pump
draws enough heat to heat a house.
Example: drawing of a brine/water heat pump with
oor heating:
4⁄4 = usable energy
approx. 3⁄4 = environmental energy
approx. 1⁄4 = external electrical energy
11 Area of utilisation
Taking into consideration the ambient conditions, lim-
its of application and the applicable regulations, eve-
ry heat pump can be utilized in new or existing heat-
ing systems.
 "Technical data / scope of delivery“, from
page 26

7
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
12 Heat quantity recording
In addition to the proof of the unit's e󰀩ciency, EE-
WaermeGalso meets the demand for a heat quantity
recording (hereafter refered to as HQR). The HQR is
mandatory with air/water heat pumps. With brine/ wa-
ter and water/water heat pumps, a HQR may only be
set up when a forward ow temperature of ≥ 35 °C has
been reached. The HQR must record the total warm
energy release (heating and hot water) in the building.
In heat pumps with heat quantity recording, the anal-
ysis is conducted by the regulator. The regulator dis-
plays the thermal energy that is exchanged from the
heating system in kWh.
13 Operation
Your decision to purchase a heat pump or a heat pump
system is a long-term contribution to protecting the en-
vironment through low emissions and reduced prima-
ry energy use.
You can operate and control the heat pump system
with the control element of the heating and heat pump
regulator.
NOTE
Make sure that the control settings are cor-
rect.
 Operating manual of the heating and heat pump
regulator
To ensure that your heat pump or heat pump system
operates e󰀩ciently and ecologically, the following are
especially important:
€ENERGY SAVING TIP
Avoid unnecessarily high ow temperatures.
A lower ow temperature on the hot water
side increases the e󰀩ciency of the system.
€ENERGY SAVING TIP
When letting in fresh air. do not leave win-
dows open for an extended period in order to
save energy and reduce your heating costs.
14 Care of the unit
The outer surfacesof theunit can be cleaned with a
damp cloth and household cleaning products.
Do not use cleaning or care products that contain
abrasives, acids and/or chlorine. Such products would
destroy the surfaces and could also damage the tech-
nical components of the unit.

8Subject to change without notice | 83054400fUK | ait-deutschland GmbH
15 Scope of delivery
Example of scope of delivery:
View 1:
View 2:
Unit with a completely hermetically enclosed
compressor, all safety-related components for
monitoring of the cooling circuit, integrated
heating and heat pump regulator, sensors
mounted in the unit for the monitoring of hot
gas, heating water forward ow and return
ow temperatures, as well as a hose for
condensate discharge (connected to heat
pump side)
1. Inspect delivery for outwardly visible signs of
damage.
2. Check to make sure that delivery is complete.
Any defects or incorrect deliveries must be
claimed immediately.
NOTE
Note the model. Check the air blow-out direc-
tion of the unit.
● Units with the abbreviation L in the model
designation blow the air out to the left
(when viewed from the control side).
 "Technical data / scope of delivery“, from
page 26
Accessories necessary for operation
IMPORTANT
Use only original accessories from the manu-
facturer of the unit.
Air ducts (with air duct accessories) must be ordered
separately.
Additional accessories
You must order separately:
● installation accessories (vibration decouplers)
for air/water indoor installation heat pumps
● air / magnetic sludge separator
16 Transport, installation,
assembly
Observe the following when performing all work:
NOTE
Always comply with applicable accident pre-
vention regulations, statutory regulations, or-
dinances and directives.
NOTE
Observe the sound levels of the respective
model.
 "Technical data / scope of delivery“, from
page 26, “Sound” section

9
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
16.2 Transport to installation location
To prevent damage during transport, always transport
the unit to nal installation location in its original pack-
aging, using a lifting truck.
NOTE
You can underpin the LW 251(L) using a lift-
ing truck; transport the other units on the
wooden pallet.
LW 251(L)
If it is not possible to transport the unit to the nal in-
stallation location using a lifting truck, you can also
transport the heat pumps using a hand truck (not appli-
cable for the LW 251(L)).
 "Lifting the unit with pipes“, from page 10
DANGER
Several people are required to transport
the unit. Do not underestimate the weight
of the unit.
 "Technical data / scope of delivery“, from
page 26, “General unit data” section
DANGER
The unit is not fastened to the wooden pal-
let!. Danger of tipping over during trans-
port! This can result in personal injury and
damage to the unit.
► Take suitable precautionary measures to
eliminate the danger of tipping.
IMPORTANT
Never use components and hydraulic con-
nections on the unit for purposes of transport.
IMPORTANT
Do not damage the hydraulic connections un-
der any circumstances.
IMPORTANT
Do not tilt the unit more than a maximum of
45° (in any direction).
16.1 Installation location
IMPORTANT
Install the unit only indoors.
Installation room and space requirements
NOTE
Note and follow the local regulations and
standards regarding the installation room and
space requirements. The table shows the
regulations according to EN 378-1 relevant
in Germany.
Refrigerant Limit value [kg/m³]
R 134a 0.25
R 404A 0.52
R 407C 0.31
R 410A 0.44
R 448A 0.39
 "Technical data / scope of delivery“, from
page 26
Minimum room volume = Refrigerant capacity [kg]
Limit value [kg/m³]
NOTE
If several heat pumps of the same type are in-
stalled, only one heat pump need to be taken
into account. If several heat pumps of di󰀨er-
ent types are installed, only the heat pump
with the largest refrigerant volume needs to
be taken into account.
9Minimum volume corresponds to the require-
ments for the refrigerant used.
9Installation inside the building only.
9Installation room is dry and frost-free.
9Clearance dimensions are met
 "Dimensional drawings“, from page 31, and "In-
stallation plans“, from page 35, for respective
unit model
NOTE
The noise emissions of the heat pumps
must be taken into account in the respective
installation plans for air/water heat pumps.
The respective regional regulations must be
observed.
9The surface/oor is suitable for installation of the
unit:
● level and horizontal foundation
● load-bearing capacity for the unit’s weight

10 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
Lifting the unit with pipes
(not possible with the LW 251(L))
The LW 140(L) and LW 180(L) units can be lifted with
3/4" and/or 1" pipes (provided by customer) that are
suitable for the weight of the respective unit. Special
holes are provided in the frame for this purpose.
1. Remove lower facing panels on the switch box
side (= operator side) side of the unit. To do so,
loosen quick-release screws. Turn counter-clock-
wise 90°.
1 Quick-release screws
2 Lower facing panel
2. Pull lower facing panel upwards and outwards,
detach and set securely to the side.
3. On the back of the unit, remove the sealing grom-
met.
4. Insert the pipes through the holes in the frame on
the switch box side (= operator side).
1 Holes in the frame
2 Inserted pipes
Make sure that pipes do not damage cable as-
semblies and components in the unit. Guide pipes
carefully past cable assemblies and components
in the unit.
5. Guides pipes through the marked openings on the
back side of the unit.
6. Lift the unit on the pipes with at least four people
and carry it to its nal installation location.
7. Put the unit in its nal installation location. Make
sure that the frame of the unit is in full contact with
the underlying surface.
8. Remove the pipes and re-place the sealing grom-
mets on the back side of the unit.
9. If the electrical connections will not be carried out
directly thereafter, mount the lower facing panel
on the operating side.

11
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
2. Pull lower facing panel upwards and outwards,
detach and set securely to the side.
3. Remove the screws located on the lower side of
the upper facing panel.
4. Slant the facing panel upwards, remove and set
aside in a safe place.
Then remove side facing panels from the unit too
and store safely.
5. At the fan, thread the two guide rods supplied
through the metal tab and fan.
Retractable ventilator
In order to allow the unit to be easily transported
through tight cellar spaces and narrow doorways and/
or hallways, the ventilator retracts approx. 10 cm into
the body of the unit.
1 Fan in delivery condition
2 Fan pushed into the unit
IMPORTANT
Only retract the ventilator into the body of the
unit for transport purposes and extend it to its
original positions following transport.
1. Remove lower facing panels on the fan side of the
unit. To do so, loosen quick-release screws. Turn
counter-clockwise 90°.
1 Quick-release screws
2 Lower facing panel

12 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
Then, on both sides, hook the guide rods in the
keyhole slot pattern of the upper metal tab inside
the unit.
6. On the inside of the device, undo all four nuts
(M12) of the fan's connections and remove togeth-
er with the spring washers.
7. Push the fan in the direction of the evaporator up
to the top metal tab inside the unit.
1 top metal tab inside the unit
8. Push the screws M12 x 40 (2x) supplied through
the fan and the top metal tab and secure with nuts
M12.
9. Lower the unit at the installation location. Make
sure that the frame of the unit is in full contact with
the underlying surface and the unit is positioned
horizontally.
Undo the mounting nuts at the top metal tab and
remove the corresponding screws.
Then pull the fan out of the unit and screw tightly
back onto the unit frame (do not forget the spring
washers).
10. Remove guide rods and attach all facing panels
back onto the unit.
16.3 Installation
Set the unit on a stable, solid and level, preferably
sound-insulated surface. Make sure that the founda-
tion is designed for the weight of the heat pump.
CAUTION
In the air outlet area the air temperature is
ca. 5 K below the ambient temperature. Un-
der certain climatic conditions, therefore,
an ice layer can form in the air outlet area.
Install the heat pump so that the air blower
does not blow in the direction of footpaths.
IMPORTANT
Do not tilt the unit more than a maximum of
45° (in any direction).
NOTE
Always observe the installation plan for the
respective model. Note the size and minimum
clearances.
 "Installation plans“, from page 35, for respec-
tive unit model
Set up the unit so that the switch box side (= operating
side) is accessible at all times.
16.4 Mounting the air ducts
NOTE
Note the air blow-out direction of the unit.
● Units with the abbreviation L in the model
designation blow the air out to the left
(when viewed from the control side).
IMPORTANT
Use only original accessories or air ducts
recommended by the manufacturer (bre-
glass lightweight concrete ducts).
Mount air ducts only according to the installa-
tion plan for the respective unit.
 "Installation plans“, from page 35, for respec-
tive unit model

13
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
6. Stabilise the wall duct from the inside using the
chipboard included with delivery.
7. Install the wall duct in the masonry from the
house exterior.
This can either be done during the construction
phase (by means of sealing).
NOTE
Mount the wall ducts 1 cm above the nished
outer facade.
1 Masonry of the house exterior
2 Insert the wall duct in the masonry (1 cm
above the nished outer facade)
or retrot (using foam in the masonry):
1 Finished outer facade
NOTE
Wall ducts x wall openings, help avoid cold
air transmission in the masonry as well as as-
sist in the assembly of weather / rain guards
and wire mesh grilles
Wall duct(s) assembly
1. Remove the parts necessary for the assembly of
the wall duct(s) from their respective boxes.
2. Next, interlock the 2 pieces of the wall duct(s)
that belong together, as illustrated in the following
drawing. Use the lubricant supplied upon delivery
to help in this process.
3. A󰀩x an additional part as illustrated.
4. Rotate the already-interlocked parts 90° and a󰀩x
the nal piece at the bottom.
5. Rotate the already-interlocked parts by 90° once
again and set up the nal connection.

14 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
Air ducts assembly
1. Remove the parts necessary for the assembly of
the air duct(s) from their respective boxes.
2. The interlocking of the air ducts is carried out
as described in the section 2 – 5 entitled "Wall
duct(s) assembly".
IMPORTANT
The height di󰀨erence between the vertical
centre of the air duct connections on the
unit and the top edge of the air inlet / air out-
let on the building must not exceed 2 m.
Securing the air duct into the wall duct
1. Pull the roll seal included with delivery over the
end of the air duct.
2. Push this end of the air duct into the wall duct.
1 Wall duct
2 Air duct
3 Roll seal
4 Bentonite waterproong tape (apply only after
assembling the unit's connection fastener)
NOTE
After the other end of the air duct has been
secured to the heat pump, close the opening
between the wall duct and the air duct using
the bentonite waterstop tape included with
delivery.
Securing the air duct on the heat pump
1. Clip on the assembly rail and secure it using spe-
cial screws to the spots on the air duct designated
as the air intake side.
2. Stick the adapter base included with delivery on
the edge of the air duct.
3. Position the air duct on the respective opening of
the air intake side.
4. Hook the 4 tension springs included with delivery
into the holes provided for them on the air intake
side of heat pump.
5. Hook the tension springs into the assembly tail
that has been screwed on to the air duct.
6. Secure a protective cap over the assembly rail.
7. Repeat – the process on the air output side.
NOTE
Don't forget:
After the air ducts have been secured to the
heat pump, close the opening between the
wall duct and the air duct using the bentonite
waterstop tape included with delivery.
NOTE
Secure the air ducts to the cover using appro-
priate measures.

15
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
3. Position the wire mesh grille in the assembly
frame.
4. Set the weather / rain guards on the assembly
frame in the wall duct and screw down.
8 x
NOTE
If the wall duct is positioned above ground
level, attach the weather guard.
If the wall duct is positioned in a light well (be-
low ground level), attach the rain guard.
5. Repeat 2 – 4 the process on the air output side.
Screen frame assembly
Screw the screen frame to the wall ducts on both the
air intake and output sides.
NOTE
The screen frame has no function, it is in-
cluded solely to provide an optically attractive
transition to the wall duct.
Wire mesh grille and weather / rain guards
assembly
1. Remove the wire mesh grille and the weather / rain
guards as well as the assembly frame and fasten-
ing material from their respective boxes.
2. From the outside of the house inwards, insert the
assembly frame into the wall duct on the air intake
side and secure with screws.
8 x

16 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
16.5 Installation / connection to
heating circuit
IMPORTANT
Connect the unit to the heating circuit accord-
ing to the hydraulic diagram for the respec-
tive model.
 Hydraulic connection” instructions
NOTE
Check to make sure that the diameters and
lengths of the pipes for the heating circuit are
su󰀩ciently dimensioned.
NOTE
Circulating pumps must be multi-stage, reg-
ulated pumps. They must be able to deliver
at least the minimum hot water ow rate re-
quired for your model.
 "Technical data / scope of delivery“, from
page 26, “heating circuit” section
IMPORTANT
The hydraulic system must be equipped with
a bu󰀨er tank, the required volume of which
depends on the model of your unit.
 "Technical data / scope of delivery“, from
page 26, “heating circuit, bu󰀨er tank” section
IMPORTANT
Dirt and deposits in the (existing) hydraulic
system can cause damage to the heat pump.
► Ensure that a sludge separator is installed in the
hydraulic system.
► Rinse the hydraulic system thoroughly prior to es-
tablishing the hydraulic connection of the heat
pump.
IMPORTANT
When installing the connections, always se-
cure the connections on the unit from twist-
ing, in order to prevent damage to the copper
pipes in the interior of the unit.
1. Install shut-o󰀨 devices for the hot water outow
(forward ow) and hot water inow (return ow) on
the heat pump side.
NOTE
During installation of the shut-o󰀨 devices, the
liqueer of the heat pump can be rinsed, if
necessary.
2. Connect the unit to the pipes of the heating circuit
via vibration decouplers.
They must be installed in order to prevent damage
from vibrations to the pipes.
NOTE
If an existing system is being replaced, the
old vibration decoupling may not be reused.
Vibration decouplers are available as acces-
sories.
The connections for the heating water outow (forward
ow) and the hot water inow *(return ow) are marked
accordingly.
 For positioining of the connections: "Dimension-
al drawings“, from page 31, for the respective
model
16.6 Condensate discharge
The condensation water that accumulated from the air
must be drained via the pre-mounted hose in the unit
for condensate discharge. To do so, connect the hose
for condendate discharge with a water drain.
 For positioning of the connection for conden-
sate discharge: "Dimensional drawings“, from
page 31, for the respective model
1 Hose for condensate discharge in interior of
unit
2 Connection for the condensate discharge on
the outside of the unit

17
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
20 Circulating pumps
IMPORTANT
Always note the model.
Do not use regulated circulating pumps.
Circulating pumps and domestic hot water cir-
culation pumps must be multi-stage pumps.
21 Water heating
Water heating with the heat pump requires an addi-
tional hot water circuit, parallel to the heating circuit.
Make sure that the heating water charge is not chan-
neled through the bu󰀨er tank of the heating circuit.
 “Hydraulic connection” instructions
22 Hot-water tank
If the heat pump will be used for heating hot water,
you must integrate special hot-water tanks in the heat
pump system. The storage volume must be su󰀩cient
so that the required hot water quantity is available
even during a power outage.
NOTE
The heat exchanger surface of the hot water
tank must be dimensioned so that the heating
capacity of the heat pump is transferred with
minimal spreading.
We o󰀨er a variety of hot-water tanks for you to choose
from. They are optimized for use with your heat pump.
NOTE
Integrate the hot-water tank in the heat pump
system corresponding to the hydraulic dia-
gram for your system.
 “Hydraulic connection” instructions
IMPORTANT
Guide the pre-mounted hose in the unit for
condensate discharge in the interior of the
unit as a siphon, as shown in the illustration.
Discharge of the condensate into the sewage system
is permitted only via a funnel siphon, which must be
accessible at all times.
17 Pressure relief
Equip the heating circuit in accordance with local
standards and directives with a safety valve and an ex-
pansion tank.
Also install lling and emptying devices, shut-o󰀨 devic-
es and non-return valves in the heating circuit.
18 Overow valve
Use an overow valve for tanks integrated in series to
ensure the minimum ow rate of the heating circuit vol-
ume ow through the heat pump. The overow valve
must be dimensioned so that the minimum ow rate
of the volume ow through the heat pump is ensured
when the heating circuit is shut o󰀨.
 “28 Set the overow valve", page 22
19 Bu󰀨er tank
The hydraulic connection of the heat pump requires
a bu󰀨er tank in the heating circuit. It ensures a mini-
mum operating time of the heat pump when the heat-
ing circuit valves are closed. The required volume of
the bu󰀨er tank is calculated based on the following for-
mula:
VBu󰀨er tank =
minimum ow rate of
heat circuit volume ow / hour
10
 For the minimum ow rate of the heat circuit vol-
ume ow: "Technical data / scope of delivery“,
from page 26, “Heating circuit” section
In mono-energetic air/water systems, integrate the
bu󰀨er tank in the heating water outow (forward ow)
before the overow valve.

18 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
23 Electrical connections
Observe the following when performing all work:
DANGER
Danger of fatal injury due to electric cur-
rent!
Electrical connections may be installed on-
ly by qualied electricians.
Before opening the unit, disconnect the
system from the power supply and secure
it from being switched back on!
DANGER
Observe the relevant EN-, VDE and/or ap-
plicable local safety regulations during the
installation and during all electrical work.
Comply with technical connection require-
ments of the responsible power supply
company (if required by the latter)!
NOTE
All live wires must be stripped before they are
installed in the cable duct of the switch boxs!
Power connection
1. If the unit is closed, open the facing panels on the
operating side.
 “Lifting the unit with pipes", page 10, point 1
2. Open electrical switch box of unit.
Example of open
electrical switch box
3. Lead 230 V power cable, power cable for circu-
lating pumps and cable for external temperature
sensor through the rubber sockets on the facing
panel in the unit.
3.1. Cut out the rubber sockets on the facing panel.
 For positioning of the rubber sockets for insert-
ing the wires: "Dimensional drawings“, from
page 31, for the respective model
3.2. Insert the cables through the rubber sockets in
the unit.
The wires inside the unit are guided in a closed
wire duct to theterminals on the switch plate.
4. Install electric connections according to the termi-
nal diagram that applies to your model.
 “Terminal diagram", page 47
IMPORTANT
Ensure clockwise rotary eld of the load
power supply (compressor).
● An incorrect rotary eld of the compressor
during operation can cause serious, irrepa-
rable damage to the compressor.
IMPORTANT
The power supply for the heat pump must be
equipped with an all-pole miniature circuit-
breaker with at least 3 mm contact spacing to
IEC 60947-2.
Residual current circuit breaker type A is suf-
cient.
 "Technical data / scope of delivery“, from
page 26, “Electric” section.
IMPORTANT
If using the unit in 3~230V systems, please
note that the residual-current circuit breaker
(RCCB) used must be AC-DC sensitive.
NOTE
Factory setting for the electric heating ele-
ment in units with integrated electic heating
elements is 6 kW (9 kW). It can be changed
at contactor Q5 (Q6) for 2 kW (3 kW) or 4 kW
(6 kW).

19
Subject to change without notice | 83054400fUK | ait-deutschland GmbH
24 Rinsing, lling and bleeding
the system
IMPORTANT
The system must be absolutely free from air
before commissioning.
Unsuitable quality of the water for lling up
and replenishing the heating circuit
The e󰀩ciency of the system and the service life of the
heat generator and the heating components depend
decisively on the quality of the heating water.
If the system is lled with untreated drinking water, cal-
cium deposits will form as scale. Lime scale deposits
accumulate on the heat transfer surfaces of the heat-
ing. The e󰀩ciency is reduced and energy costs in-
crease. In extreme cases, the heat exchangers will be
damaged.
Heating water quality
NOTE
● For detailed information refer, among
other things, to the VDI Guidelines
2035 “Vermeidung von Schäden in
Warmwasserheizanlagen” (preventing
damage in hot water heating systems)
● Required pH value: 8.2 … 10;
for aluminium materials:
pH value: 8.2 … 8.5
► Fill the system with deionised heating water
(VE water) or with water corresponding to the VDI
2035 norm only (low-salt operation of the system).
Advantages of low-salt operation:
●Low corrosion-promoting properties
● No formation of mineral scale
● Ideal for closed heating circuits
● Ideal pH value due to self-alkalisation after lling
the system
► If the required water quality is not achieved, con-
sult a company specialising in the treatment of he-
ating water.
► Keep a system log for hot water heating systems
in which relevant planning data is entered (VDI
2035).
 For further information, see the adhesive label on
the electric heating element
NOTE
The control element of the heat and heat
pump regulator can be connection with a
computer or network using an network ca-
ble designed for such pruposes, thus allow-
ing the heating and heat pump regulator to be
controlled remotely.
If such a connection is desired, install a
screened network cable (category 6, with
RJ-45 plug) through the unit when installing
the connections and run it through the front
facade of the unit, parallel to the already-pre-
sent heating and heat pump regulator control
cable.
5. Close electrical switch box of unit.
6. Attach the lower facing panels.

20 Subject to change without notice | 83054400fUK | ait-deutschland GmbH
Monitoring
Analytical recording and monitoring of the relevant
water values and the added active conditioning
substances is of decisive importance. Therefore, they
should be monitored regularly using appropriate water
test equipment.
Rinsing, lling and bleeding
To bleed the hot water tank, the heating circuit and hot
water circuit must be rinsed simultaneously.
1. Rinse, Fill and bleed the heating circuit.
2. In addition, bleed the condensor of the heat pump.
2.1. Open the lower facing panel.
2.2. Open the bleeding valve (①).
3. Following bleeding, close the lower facing panel.
25 Insulating the hydraulic
connections
Insulate the vibration decouplers and the pipes of the
heating circuit.
NOTE
Insulate in accordance with applicable local
standards and directives.
26 Installation of the control
element
Situated at di󰀨erent heights in the front facade of the
unit are recesses (each with 4 recesses) for the fas-
tening of the control element:
1 four upper recesses
2 four lower recesses
4 hooks are located on the back side of the control el-
ement and can be used to hang the control element on
the front facade of the unit:
1. Hang the control element's hooks on the recess-
es of the front facade (either in the upper or low-
er recesses).
Example:
Control element in upper recesses