Alpha LW A Series User manual

We reserve the right to modify technical specifications without prior notice.
83054200fUK © ait-deutschland GmbH
Translation of the original instruction manual
HEAT PUMPS
Operating Manual
Outdoor Installation
A IR / WATER
UK
LW A Series
LW H-A Series

2
We reserve the right to modify technical specifications without prior notice.
83054200fUK © ait-deutschland GmbH
Please read rst
This operating manual provides important information
on the handling of the unit. It is an integral part of the
product and must be stored so that it is accessible 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 operators of the
unit.
Read the operating manual before working on or oper-
ating the unit. This applies in particular 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
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 several dif-
ferent models of the unit, always comply with the pa-
rameters 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 oper-
ating manual 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.
Symbols
The following symbols are used in the operating manual.
They have the following meaning:
Information for operators.
Information or instructions for qualied techni-
cians.
DANGER
Indicates a direct impending danger re-
sulting in severe injuries or death.
WARNING
Indicates a possibly dangerous situa-
tion that could result in severe injuries or
death.
CAUTION
Indicates a possibly dangerous situation
that could result in medium or light inju-
ries.
ATTENTION
Indicates a possibly dangerous situation, which
could result in property damage.
NOTICE
Emphasized information.
€ENERGY SAVING TIP
Indicates suggestions that help to save energy,
raw materials and costs.
Reference to other sections of the operating
manual.
Reference to other instructions of the manufac-
turer.

3
Contents
INFORMATION FOR OPERATORS AND
QUALIFIED SPECIALISTS
PLEASE READ FIRST..................................................................2
SYMBOLS .....................................................................................2
INTENDED USE..........................................................................4
EXCLUSION OF LIABILITY......................................................4
EC CONFORMITY .....................................................................4
SAFETY.........................................................................................4
CUSTOMER SERVICE ................................................................5
WARRANTY / GUARANTEE...................................................5
DISPOSAL ....................................................................................5
INFORMATION FOR OPERATORS AND
QUALIFIED SPECIALISTS
OPERATING PRINCIPLE OF HEAT PUMPS ...........................6
AREA OF UTILIZATION...........................................................6
HEAT QUANTITY RECORDING ............................................6
OPER ATIO N ................................................................................6
CARE OF THE UNIT..................................................................7
MAINTENANCE OF THE UNIT..............................................7
Cleaning and rinsing of unit components..........................7
MALFUNCTIONS.......................................................................7
INSTRUCTIONS FOR QUALIFIED TECHNICIANS
SCOPE OF DELIVERY ................................................................8
INSTALLATION AND ASSEMBLY...........................................9
Installation location..............................................................9
Transport to installation location......................................9
Installation..............................................................................9
Attaching the air flow baffles............................................12
Installation / connection to heating circuit ....................14
Condensate discharge ........................................................15
PRESSURE RELIEF.....................................................................15
OVERFLOW VALVE..................................................................15
BUFFER TANK...........................................................................16
CIRCULATING PUMPS ...........................................................16
WATER HEATING ....................................................................16
HOT-WAT ER TANK .................................................................16
ELECTRICAL CONNECTIONS .............................................17
RINSING, FILLING AND BLEEDING THE SYSTEM ..........20
Water quality of the fill and additional water in hot
water heating systems .................................................20
INSULATING THE HYDRAULIC CONNECTIONS ..........22
COMMISSIONING ...................................................................22
Safety temperature limiter................................................23
DISMANTLING .........................................................................23
TECHNICAL DATA / SCOPE OF DELIVERY
LW 71A – LW 121A ............................................................24
LW 140A – LW 310A..........................................................26
LW 100H-A – LW 180H-A................................................28
PERFORMANCE CURVES
LW 71A .................................................................................30
LW 81A .................................................................................31
LW 101A ...............................................................................32
LW 121A ...............................................................................33
LW 140A...............................................................................34
LW 180A...............................................................................35
LW 251A ...............................................................................36
LW 310A ...............................................................................37
LW 100H -A..........................................................................38
LW 180H-A..........................................................................39
SOUND PRESSURE LEVEL..................................................... 40
DIMENSIONAL DRAWINGS
LW 71… • LW 81… ............................................................41
LW 101A • LW 100H-A......................................................42
LW 121A ...............................................................................43
LW 140A • LW 180A • LW 180H-A
LW 251A ...............................................................................45
LW 310A ...............................................................................46
DIMENSIONAL DRAWINGS
INSTALLATION PLANS
LW 71… • LW 81… ............................................................47
LW 101… • LW 100H….................................................... 48
LW 121… ..............................................................................49
LW 140… – LW 180…A • LW 180H…...........................50
LW 251…..............................................................................51
LW 310…..............................................................................52
TERMINAL DIAGRAMS
LW 71A – LW 81A • LW 100H-A – LW 180H-A...........53
LW 101A – LW 251A ..........................................................54
LW 310A ...............................................................................55
CIRCUIT DIAGRAMS
LW 71A • LW 81A...............................................................56
LW 101A • LW 121A...........................................................58
LW 140A...............................................................................60
LW 180A...............................................................................62
LW 251A .............................................................................. 64
LW 310A ...............................................................................67
LW 100H -A..........................................................................69
LW 180H-A..........................................................................71
LW 180H-A..........................................................................73
APPENDIX
EC DECLARATION OF CONFORMITY..............................74
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83054200fUK © ait-deutschland GmbH

4
We reserve the right to modify technical specifications without prior notice.
83054200fUK © ait-deutschland GmbH
Intended use
The unit may be used only for the intended use. This
means:
•for heating.
•for heating hot water.
The unit may be operated only within its technical pa-
rameters.
Overview “Technical data/scope of delivery”.
NOTICE
Notify the responsible power supply company of
the use of a heat pump or heat pump system.
CAUTION
The unit is not suitable for use in IT network
systems.
Exclusion of liability
The manufacturer will not be liable for damage resulting
from unauthorized use of the unit.
The manufacturer’s liability will also be voided in the fol-
lowing 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 man-
ufacturer;
•if the unit or components in the unit are modied,
redesigned or removed without the express writ-
ten permission of the manufacturer.
EC conformity
The unit bears the CE mark of conformity.
EC declaration of conformity
Safety
The unit is operationally safe when used for the intend-
ed purpose. The construction and design of the unit con-
form to the state of the art, all relevant DIN/VDE regu-
lations and all relevant safety regulations.
Every person who performs work on the unit must have
read and understood the operating manual prior to
starting any work. This also applies if the respective per-
son has already worked with such a unit or a similar unit
or has been trained by the manufacturer.
Every person who performs work on the unit must com-
ply with the applicable accident prevention and safety
regulations. This applies in particular to the wearing of
personal safety gear.
DANGER
Danger of fatal injury due to electric
current!
Electrical connections may be installed
only by qualied electricians.
Before opening the unit, disconnect the
system from the power supply and secure
it from being switched back on!
ATTENTION
If using the unit in 3~230V systems, please note
that the residual-current circuit breaker (RCCB)
used must be AC-DC sensitive.
WARNING
Only qualied technicians (trained heat-
ing, cooling and electrical technicians)
may perform work on the unit and its
components.
WARNING
Observe safety labels on and in the unit.

5
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83054200fUK © ait-deutschland GmbH
WARNING
Unit contains refrigerants!
Leaking refrigerant could result in person-
al injury or material damage. Therefore:
– Shut down unit.
– Notify the manufacturer’s authorized
service center.
ATTENTION
For safety reasons:
Never disconnect the unit from the power sup-
ply, unless the unit is being opened.
ATTENTION
Install the heat pump only outdoors and operate
only with outside air as the heat source. Do not
restrict or block the air-conducting sides.
Dimensional drawing and installation plan for re-
spective unit model.
WARNING
Never switch on unit if air ow bafes on
the unit are removed.
ATTENTION
The integration of the heat pump in ventila-
tion systems is not permissible. The use of the
cooled air for cooling purposes is not permitted.
ATTENTION
The ambient air in the location where the heat-
ing 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, chlo-
rine, salt, sewer gas, ue gases etc. may cause
damage leading to complete failure or even a to-
tal write-off of the heating pump!
CAUTION
In the air outlet area the air temperature
is ca. 5 K below the ambient temperature.
Under certain climatic conditions, there-
fore, an ice layer can form in the air out-
let area. Install the heat pump so that the
air blower does not blow in the direction
of footpaths.
Customer service
For technical assistance, please contact your qualied
technician or the manufacturer’s local service partner.
For a current list and additional partners of the manufac-
turer, please visit
DE: www.alpha-innotec.de
EU: www.alpha-innotec.com
Warranty / Guarantee
For warranty and guarantee conditions, please refer to
the purchase documents.
NOTICE
Please contact your dealer concerning warran-
ties and guarantees.
Disposal
When decommissioning the unit, always comply with ap-
plicable laws, directives and standards for the recovery,
recycling and disposal of materials and components of
cooling units.
“Dismantling”.

6
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83054200fUK © ait-deutschland GmbH
Operating principle of heat
pumps
Heat pumps operate on the principle of a refrigerator:
the same technology, only with the opposite effect. The
refrigerator extracts heat from foods, which is released
into the room through ns on the back.
The heat pump extracts heat from our environment: air,
earth or water. The extracted heat is conditioned 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
ca. 3⁄4= environmental energy
ca. 1⁄4= external electrical energy
Area of utilization
Taking into consideration the ambient conditions, limits
of application and the applicable regulations, every heat
pump can be utilized in new or existing heating systems.
Overview “Technical data/scope of delivery”.
Heat quantity recording
In addition to the proof of the unit’s efciency,
EEWaermeGalso meets the demand for a heat quantity
recording (hereafter refered to as HQR). The HQR
is mandatory with air/water heat pumps. With brine/
water 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 analysis is
conducted by the regulator. The regulator displays the
thermal energy that is exchanged from the heating system
in kWh.
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 primary
energy use.
You can operate and control the heat pump system with
the control element of the heating and heat pump regu-
lator.
NOTICE
Make sure that the control settings are correct.
Operating manual of the heating and heat pump
regulator.
To ensure that your heat pump or heat pump system
operates ef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 efciency of the system.
€ENERGY SAVING TIP
When letting in fresh air, do not leave windows
open for an extended period, thus saving energy
and reducing your heating costs.

7
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83054200fUK © ait-deutschland GmbH
Care of the unit
The outer surfaces of the unit can be cleaned with a
damp cloth and household cleaning products.
Do not use cleaning or care products that contain abra-
sives, acids and/or chlorine. Such products would de-
stroy the surfaces and could also damage the technical
components of the unit.
Maintenance of the unit
The cooling circuit of the heat pump requires no regu-
lar maintenance.
According to EU regulation (EC) 842/2006, leak
inspections and maintenance of a log book are required
by law for certain heat pumps!
The criteria for conducting leak inspections and
maintaining a log book are based on the hermetic
impermeability of the cooling circuit and the refrigerant
capacity of the heat pump! No log book is required for
heat pumps with a refrigerant capacity of < 3kg. With all
other heat pumps, the log book is included with all other
delivered materials.
Log book for heat pumps, Section “Information
on use of the log book”.
The components of the heating circuit and the heat
source (valves, expansion vessels, circulating pumps,
lters, dirt traps) should be inspected as well as cleaned
as needed - at the very least annually - by a qualied
heating or cooling system technician.
The intake and blow-out openings must be inspected for
dirt at regular intervals (depending on the installation lo-
cation) and cleaned, if necessary.
ATTENTION
Check regularly to ensure that the condensate
can drain out of the unit unobstructed. To this
end, regularly check the condensate pan in the
unit and the condensate drain to ensure that
they are clean / free from obstructions and clean
as needed.
Icing of the protective grating
When temperatures fall below freezing and high levels
of humidity are present, ice can form on the protective
grating of the air ow bafes. In order to ensure prob-
lem-free operations, the ice must be removed on a reg-
ular basis.
It is a good idea to have a maintenance contract with a
heating installation company. The company will conduct
the required maintenance at regular intervals.
CLEANING AND RINSING OF UNIT COMPONENTS
CAUTION
Unit components may be cleaned and
rinsed only by customer service personnel
authorized by the manufacturer. Use only
liquids recommended by the manufactur-
er.
Rinsing of the liqueer with chemical
cleaning agents must be followed by neu-
tralization of residue and intensive rinsing
with water. Always observe the technical
data of the manufacturer of the heat ex-
changer.
Malfunctions
In the event of a malfunction, you can detect the cause of
the malfunction via the diagnostic program of the heating
and heat pump regulator.
Operating manual of the heating and heat pump
regulator.
WARNING
Service and repair work on the compo-
nents of the unit may be performed only
by customer service personnel authorized
by the manufacturer.
Overview “Customer service”.
Note that no malfunction is displayed if the safety tem-
perature limiter on the electric heating element has
been triggered (depending on unit model).
“Commissioning”, “Safety temperature limiter”
section.

8
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83054200fUK © ait-deutschland GmbH
Scope of delivery
Example of scope of delivery:
LW 71… / LW 81…(ONE PACKING UNIT):
Compact unit with fully hermetically
enclosed compressor, all safety-related
components for monitoring of cooling circuit
and hose for condensate discharge.
LW 101… THROUGH LW 310… AND LW … H…
(TWO PACKING UNITS):
Packing unit 1:
Air ow bafes (quantity
of 2, each in a separate box)
Packing unit 2:
Basis unit (this illustration shows an example LW
121…) with fully hermetically enclosed compressor,
all safety-related components for monitoring
of cooling circuit and hose for condensate
discharge (connected on heat pump side).
Inspect delivery for outwardly visible signs of dam-
age…
Check to make sure that delivery is complete…
Any defects or incorrect deliveries must be claimed
immediately.
NOTICE
Note the model.
Overview “Technical data/scope of delivery”.
ACCESSORIES NECESSARY FOR OPERATION
ATTENTION
Use only original accessories from the manufac-
turer of the unit.
The heating and heat pump regulator and the control
and sensor wires are necessary for operation of the unit
and must be ordered separately.
The heat pump is a functioning unit only with the heat-
ing and heat pump regulator and the control and sensor
wires.
Heating and heat pump regulator
(for wall mounting)
Control and sensor wires are available in various lengths,
as required.
ADDITIONAL ACCESSORIES
The installation accessories (vibration decouplers) for
air/water outdoor installation heat pumps must be or-
dered separately.
With the LW 310A, you must select the electrical heat-
ing element for the specic system and order it sepa-
rately.

9
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83054200fUK © ait-deutschland GmbH
Installation and assembly
Observe the following when performing all work:
NOTICE
Always comply with applicable accident pre-
vention regulations, statutory regulations, ordi-
nances and directives.
NOTICE
Observe the sound levels of the respective
model.
Overview “Technical data/scope of delivery”,
“Sound” section and “Sound level” overview.
INSTALLATION LOCATION
ATTENTION
Install the unit only outdoors.
Dimensional drawing and installation plan for re-
spective unit model.
TRANSPORT TO INSTALLATION LOCATION
To prevent damage during transport, always transport
the unit to nal installation location in its original packag-
ing, using a lifting truck, forklift or crane.
WARNING
Several people are required to transport
the unit. Do not underestimate the weight
of the unit.
Overview “Technical data/scope of delivery”,
“General unit data” section.
WARNING
Unit is not fastened to the wooden pallet.
Danger of tipping over during transport!
This can result in personal injury and dam-
age to the unit.
– Take suitable precautionary measures
to eliminate the danger of tipping.
ATTENTION
Never use components and hydraulic connec-
tions on the unit for purposes of transport.
ATTENTION
Do not damage the hydraulic connections under
any circumstances.
ATTENTION
Do not tilt the unit more than a maximum
of 45° (in any direction).
INSTALLATION
Place the unit on a solid, level foundation that is capable
of bearing weight. Make sure that the foundation is de-
signed for the weight of the heat pump. Materials that
meet this requirement can be used for the foundation
(concrete, stone slabs, etc.). The ground surface in the
air outlet area of the heat pump must be permeable to
water.
CAUTION
In the air outlet area the air temperature
is ca. 5 K below the ambient temperature.
Under certain climatic conditions, there-
fore, an ice layer can form in the air out-
let area. Install the heat pump so that the
air blower does not blow in the direction
of footpaths.
NOTICE
Always observe the installation plan for the re-
spective unit model. Note the size and minimum
clearances.
Installation plan for respective unit model.

10
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83054200fUK © ait-deutschland GmbH
Loosen quick-release screws. Turn counter-clock-
w i se 9 0 °…
On both sides, pull lower facing panel upward and
outward, detach and set securely aside.
LIFTING THE UNIT WITH PIPES
(only LW 71… through LW 180…)
The units LW 71… through LW 180… can be lifted with
¾” pipes (provided by customer) that are suitable for
the weight of the respective unit. Special holes are pro-
vided in the frame for this purpose.
NOTICE
For mode LW 251… and higher, lifting with pipes
is not possible.
Proceed as follows:
Insert the pipes through the holes in the frame on
the switch cabinet side (= operator side)…
LW 71… / LW 81…:
NOTICE
Set up the unit so that the switch cabinet side (=
operating side) is accessible at all times.
PREPARING FOR INSTALLATION
LW 71… / LW 81…:
Remove facing panels on the switch cabinet side (=
operator side) and the water connection side of the
unit…
Loosen quick-release screws. Turn counter-clock-
w i se 9 0 °…
On both sides, pull facing panel outward, detach at
top and set securely aside.
LW 101… THROUGH LW 180…:
Remove lower facing panels on the switch cabinet
side (= operator side) and the water connection
side of the unit…
1 Quick-release screws
2 Lower facing panel

11
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83054200fUK © ait-deutschland GmbH
LW 101… through LW 180…:
Make sure that pipes do not damage cable assemblies
and components in the unit…
Guide pipes carefully past cable assemblies and
components in the unit…
Guide pipes out through the holes on the water
connection side…
LW 71… / LW 81…:
LW 101… through LW 180…:
Lift unit by the pipes, with at least four persons, and
place on the base. Make sure that the frame of the
unit is in full contact with the underlying surface.
LIFTING THE UNIT WITH A CRANE
NOTICE
Models LW 251… and higher must be lifted using
a crane.
Proceed as follows:
Remove side laths on the wooden pallet…
Guide lifting straps under the unit. Insert laths or
beams between the lifting straps and the unit in or-
der to prevent damage to the housing, or remove
facing panels (see removal instructions under “At-
taching air ow bafes”)…
A Front view (operator side)
B Side view 1
DANGER
Lifting straps should not be too close to-
gether or too near the center; otherwise
the unit may tip!

12
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83054200fUK © ait-deutschland GmbH
C Side view 2
ATTENTION
Guide lifting straps past the fan on the side.
Make sure the straps do not press against the
ventilator during transport.
Lift unit with the crane and place on the base. Make
sure that the frame of the unit is in full contact with
base.
ATTACHING THE AIR FLOW BAFFLES
(only for LW 101… through LW 310…
and LW … H…)
WARNING
Unit has rotating parts.
For safety reasons, mount the two air ow
bafes on the unit before continuing with
any other work.
If you have not already done so, remove lower fac-
ing panels on the switch cabinet and water connec-
tion side of the unit…
•
To do so, loosen the two quick-release screws on
the lower facing panels…
•
Pull each facing panel forward, detach from the unit
and set securely aside…
1 lower facing panels
Remove upper facing panels from unit…
•
To do so, loosen the two screws on the lower edg-
es of the upper facing panels…
•
Pull each facing panel downward and forward, de-
tach from top cover of unit and set securely aside…
1 top cover of unit
2 upper facing panels
The top cover of the unit was fastened by the upper
facing panels. After removal of the upper facing pan-
els, the top cover is loose. Remove top cover and
set securely aside…

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83054200fUK © ait-deutschland GmbH
Return top cover to frame…
Suspend upper facing panels in the top cover. Bolt
to the frame at bottom…
The air ow bafes are now installed. You can now
carry out mounting and installation work on the
unit, and afterwards attach the lower facing panels.
(see “Electrical connection work”, “Heat pump side
connection of control and sensor wires”) )…
ATTENTION
During extended interruptions in work, close
the unit with the lower facing panels.
Install air ow bafes…
ATTENTION
Remove the protective sheeting from the air
ow bafes before installation
•
Suspend air ow bafes on the brass bushings on
the top side of the frame…
1 eyelet on air ow bafe
2 brass bushing on frame
•
Bolt air ow bafes to the frame on the switch cab-
inet side (= operator side) and water connection
side…

14
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83054200fUK © ait-deutschland GmbH
Install shut-off devices for the hot water outow
(forward ow) and hot water inow (return ow)
on the heat pump side…
NOTICE
During installation of the shut-off devices, the
liqueer of the heat pump can be rinsed, if nec-
essary.
CAUTION
The condenser may be rinsed only by cus-
tomer service personnel authorized by
the manufacturer .
Connect the unit to the pipes of the heating cir-
cuit via vibration decouplers. They must be installed
in order to prevent damage from vibrations to the
pipes.
NOTICE
Vibration decouplers are available as accesso-
ries.
LW 71… / LW 81…:
1 Hot water inow (return ow) connection
2 Hot water outow (forward ow) connection
3 Condensate water hose
INSTALLATION / CONNECTION TO HEATING CIRCUIT
ATTENTION
Connect the unit to the heating circuit accord-
ing to the hydraulic diagram for the respective
model.
“Hydraulic connection” instructions.
NOTICE
Check to make sure that the diameters and
lengths of the pipes for the heating circuit (in-
cluding the ground lead between the heat pump
and the building!) are sufciently dimensioned.
NOTICE
Circulating pumps must be multi-stage. They
must be able to deliver at least the minimum hot
water ow rate required for your model.
Overview “Technical data/scope of delivery”,
“Heating circuit” section.
ATTENTION
The hydraulic system must be equipped with a
buffer tank, the required volume of which de-
pends on the model of your unit.
ATTENTION
When installing the connections, always secure
the connections on the unit from twisting, in or-
der to prevent damage to the copper pipes in
the interior of the unit.
Rinse heating circuit thoroughly prior to connecting
the unit to the heating circuit…
NOTICE
Contamination and deposits in the heating cir-
cuit can cause malfunctions.

15
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83054200fUK © ait-deutschland GmbH
LW 101… / LW 121… / LW 150H…:
1 Hot water inow (return ow) connection
2 Hot water outow (forward ow) connection
3 Condensate water hose
LW 140… THROUGH LW 310…
AND LW 320H…:
1 Hot water inow (return ow) connection
2 Hot water outow (forward ow) connection
3 Condensate water hose
Install the condensate water hose in the unit so that
there is no contact with refrigerant pipes…
Make sure that frost-free condensate discharge is
ensured…
Installation plan for respective unit model.
Seal empty pipes on unit side.
CONDENSATE DISCHARGE
The condensate from the air must be discharged frost-
free via a condensate pipe with a minimum diameter of
50 mm. For underlying surfaces that are permeable to
water, it is sufcient to insert the condensate pipe ver-
tically at least 90 cm into the ground. If the condensate
is discharged into drainage or sewage systems, install
frost-free with gradient.
Discharge of the condensate into the sewage system is
permitted only via a funnel siphon, which must be acces-
sible at all times.
Pressure relief
Equip the heating circuit in accordance with local stand-
ards and directives with a safety valve and an expansion
tank.
Also install lling and emptying devices, shut-off devices
and non-return valves in the heating circuit.
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 off.

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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 sufcient so that
the required hot water quantity is available even during
a power outage.
NOTICE
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 offer a variety of hot-water tanks for you to choose
from. They are optimized for use with your heat pump.
NOTICE
Integrate the hot-water tank in the heat pump
system corresponding to the hydraulic diagram
for your system.
Buffer tank
The hydraulic connection of the heat pump requires a
buffer tank in the heating circuit. The required volume of
the buffer tank is calculated based on the following for-
mula:
Vbuffer tank =Minimum ow rate of heat circuit volume ow / hour
10
For the minimum ow rate of the heat circuit
volume ow, see overview “Technical data/
Scope of delivery”, “Heating circuit” section.
In mono-energetic air/water systems, integrate the buf-
fer tank in the heating water outow (forward ow) be-
fore the overow valve.
Circulating pumps
CAUTION
Always note the model.
Do not use regulated circulating pumps.
Circulating pumps and domestic hot wa-
ter circulation pumps must be multi-stage
pumps.
Water heating
Water heating with the heat pump requires an addition-
al hot water circuit, parallel to the heating circuit. Make
sure that the heating water charge is not channeled
through the buffer tank of the heating circuit.
“Hydraulic connection” instructions.

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POWER CONNECTION
It is not necessary to open the electric switch cabinet in
order to connect the power to the heat pump. The pow-
er is connected at the connection boxes on the water
connection side.
Proceed as follows:
If the unit is closed, open facing panels…
“Preparing for installation”
Open connection boxes…
LW 71… / LW 81…:
1 Connection box for electric
heating element
2 Connection box for compressor
LW 101… / LW 121… / LW 150H…:
1 Connection box for electric
heating element
2 Connection box for compressor
Electrical connections
Observe the following when performing all work:
DANGER
Danger of fatal injury due to electric
current!
Electrical connections may be installed
only by qualied electricians.
Before opening the unit, disconnect the
system from the power supply and secure
it from being switched back on!
WARNING
Observe the relevant EN, VDE and/or ap-
plicable local safety regulations during the
installation and during all electrical work.
Comply with technical connection re-
quirements of the responsible power sup-
ply company (if required by the latter)!

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HEAT PUMP SIDE CONNECTION OF THE CONTROL AND
SENSOR WIRES
The heat pump is connected to the heating and heat
pump regulator by means of the control and sensor
wires. They are connected at the electric switch cabi-
net on the switch cabinet side (= operator side) of the
heat pump.
LW 71… / LW 81…:
Loosen mounting screws of the electric switch
cabinet inside the unit…
Suspend electric switch cabinet outside in the pro-
vided recesses of the frame…
ATTENTION
Do not tip electric switch cabinet.
LW 140… THROUGH LW 310…
AND LW 320H…:
1 Connection box for electric
heating element
2 Connection box for compressor
Connect power cable to the connection box
(Electric heating element with the LW 310A on-
site)…
Close connection box…
Install power cable in a conduit as far as where it
enters the building and from there on to the fuse
box…
Connect power cable to power supply.
ATTENTION
Ensure clockwise rotary eld of the load power
supply (compressor).
– An incorrect rotary eld of the com-
pressor during operation can cause
serious, irreparable damage to the
compressor.
ATTENTION
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.
Note the level of the release current.
Overview “Technical data/scope of delivery”,
“Electric” section.
ATTENTION
If using the unit in 3~230V systems, please note
that the residual-current circuit breaker (RCCB)
used must be AC-DC sensitive.

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LW 101… THROUGH LW 310… AND LW … H…:
Proceed as follows:
Screw control and sensor wires to the two connec-
tors on the side of the electric switch cabinet…
Guide control and sensor wires inside the unit
through the provided cable duct to the water con-
nection side…
1 Cable duct for control
and sensor wires
Guide control and sensor wires out of the unit…
NOTICE
In order to enable unhinging of the electric
switch cabinet in the event that customer ser-
vice is necessary, the control and sensor wires
in the heat pump must have an excess length of
about 15 cm.
Install control and sensor wires in a conduit as far
as where they enter the building and from there on
to the heating and heat pump regulator…
Connect control and sensor wires to the heating
and heat pump regulator according to the terminal
connection diagram and the circuit diagrams for the
respective model…
“Terminal diagrams” and “Circuit diagrams” for
the respective model.
Screw control and sensor wires to the two connec-
tors on the back of the electric switch cabinet…
After connecting the control and sensor wires, fas-
ten the electric switch cabinet in its original posi-
tion…
Guide control and sensor wires out of the unit…
NOTICE
In order to enable unhinging of the electric
switch cabinet in the event that customer ser-
vice is necessary, the control and sensor wires
in the heat pump must have an excess length of
about 15 cm.
Install control and sensor wires in a conduit as far
as where they enter the building and from there on
to the heating and heat pump regulator…
Connect control and sensor wires to the heating
and heat pump regulator according to the terminal
diagram and the circuit diagrams for the respective
model…
“Terminal diagrams” and “Circuit diagrams” for
the respective model.
Operating manual of the heating and heat pump
regulator.
Seal empty pipes on unit side…
Screw facing panels onto the heat pump.
NOTICE
Electric heating element is connected for 6 kW
(9 kW) at factory. It can be connected for 2(3)
or 4 kW (6 kW) on the contactor Q5 (Q6).
For further information, see the adhesive label
on the electric heating element.

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83054200fUK © ait-deutschland GmbH
Operating manual of the heating and heat pump
regulator.
Seal empty pipes on unit side…
Screw facing panels onto the heat pump…
Place lower facing panels diagonally into the frame,
close at top and fasten with in quick-release
screws…
The unit is now closed.
Rinsing, lling and bleeding
the system
ATTENTION
The system must be absolutely free from air be-
fore commissioning.
WATER QUALITY OF THE FILL AND ADDITIONAL WATER
IN HOT WATER HEATING SYSTEMS
ACCORDING TO VDI 2035 PART I AND II
Use of modern, energy-efcient heat pump systems
is becoming increasingly widespread. Their ingenious
technology enables these systems to achieve very good
efciencies. The decreasing space available for heat
generators has led to the development of compact
units with increasingly smaller cross-sections and high
capacities. This means the complexity of the systems and
the material diversity are also increasing, which plays an
important role especially in their corrosion behaviour.
The heating water not only affects the efciency of the
system, but also the life of the heat generator and the
heating components of a system.
The guide values of VDI 2035 Part I and Part II must
therefore be complied with as minimum requirements
for proper operation of the systems. Our practical
experience has shown that the safest and most trouble-
free running of the systems is achieved with so-called
low-salt operation.
VDI 2035 Part I gives important information and
recommendations regarding scaling and its prevention in
heating and domestic hot water heating systems.
VDI 2035 Part II primarily deals with the requirements
for reducing heating water corrosion in hot water
heating systems.
PRINCIPLES OF PART I AND PART II
The occurrence of scaling and corrosion damage in hot
water heating systems is low, if
- proper planning and commissioning is carried out
- the system is closed in corrosion terms
- adequately dimensioned pressurising is integrated
- the guide values for the heating water are complied
with