alphainnoTec LW 160H/V User manual

Subject to technical change without notice.
83054800bUK – Translation into English of the original German operating manual © ait-deutschland GmbH
HEAT PUMPS
Operating Manual
Indoor installation
AIR/WATER
UK
LW 160H/V

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Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual 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 kept ready to hand 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 users of the unit.
Read the operating manual before starting any work on
or with the unit. Especially the chapter on safety. Follow all
instructions in full and unreservedly.
This operating manual may contain descriptions,which 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 was written for several different
models of the unit, always comply with the parameters for
the respective model.
This operating manual is intended only for persons assigned
to work on or with the unit.Treat all its constituent parts
condentially. They are protected by copyright. They may
not be reproduced, transmitted, copied, stored in electronic
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 manual.
They have the following meaning:
Information for users.
Information or instructions for qualied personnel.
DANGER!
Indicates a direct impending danger
resulting in severe 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
injuries.
ATTENTION
Indicates a potentially dangerous situation, which
could result in property damage.
NOTE.
Emphasised 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 documents of the manufacturer.

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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............................................................................. 5
Service addresses..............................................................................5
WARRANTY/GUARANTEE.................................................................5
DISPOSAL .................................................................................................5
HOW HEAT PUMPS WORK ................................................................ 6
AREA OF USE ..........................................................................................6
HEAT METERING....................................................................................6
OPERATION.............................................................................................6
CARE OF THE UNIT..............................................................................7
MAINTENANCE OF THE UNIT ......................................................... 7
Cleaning and ushing unit components....................................... 7
MALFUNCTIONS ...................................................................................7
INSTRUCTIONS FOR QUALIFIED PERSONNEL
SCOPE OF SUPPLY.................................................................................8
INSTALLATION AND ASSEMBLY .......................................................9
Installation location .......................................................................... 9
Transport to the installation location ..........................................9
Installation ........................................................................................12
Installing the air ducts....................................................................12
Installation / connection to the heating circuit ........................16
Condensate drain ...........................................................................17
PRESSURE SAFETY ...............................................................................17
CIRCULATION PUMP .........................................................................17
BUFFER TANK........................................................................................17
WATER HEATING ................................................................................17
HOT WATER TANK..............................................................................17
ELECTRICAL CONNECTION WORK ...........................................18
FLUSHING, FILLING AND VENTING THE SYSTEM....................19
Water quality of the ll and make up water toVDI 2035.....19
INSULATING THE HYDRAULIC CONNECTIONS ....................21
INSTALLING THE CONTROL UNIT...............................................21
INSTALLING AND DISMANTLING THE MASKING PLATE .....22
COMMISSIONING................................................................................23
Safety temperature limiter............................................................24
OVERFLOW VALVE...............................................................................24
DISMANTLING......................................................................................25
TECHNICAL DATA/SCOPE OF SUPPLY ........................................26
PERFORMANCE CURVES...................................................................27
Heating capacity/COP / power consumption /
heat pump pressure loss
DIMENSIONED DRAWINGS AND INSTALLATION PLANS
Dimensioned drawings ..................................................................28
Installation plans..............................................................................29
TERMINAL DIAGRAM.........................................................................33
CIRCUIT DIAGRAMS...........................................................................34
APPENDIX
EC DECLARATION OF CONFORMITY........................................39
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH Subject to change without notice.
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Intended use
The unit is only to be used for its intended purpose. This
means:
•for heating.
•for water heating.
The unit may be operated only within its technical
parameters.
“Technical data /scope of supply” overview.
NOTE.
Notify the responsible power supply company of
the use of a heat pump or heat pump system.
Disclaimer
The manufacturer is not liable for damage or losses resulting
from any use of the unit which is not its intended use.
The manufacturer's liability also expires:
•if work is carried out on the unit and its components
contrary to the instructions in this operating manual.
• if work is improperly carried out on the unit and its
components.
•if work is carried out on the unit which is not
described in this operating manual, and this work has
not been explicitly approved by the manufacturer in
writing.
•if the unit or components in the unit have been
changed, modied or removed without the explicit
written consent of the manufacturer.
EC conformity
The unit bears the CE marking.
EC Declaration of Conformity.
Safety
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.
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 concerned 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 applicable accident prevention and safety
regulations. This applies in particular to the wearing of
personal protective clothing.
DANGER!
Risk of fatal electric shock!
All electrical connection work must be
carried out by qualied electricians only.
Before opening the unit, disconnect the
system from the power supply - wait for
90 seconds = residual voltage at inverter -
and prevent it from being switched back on
again!
WARNING!
Only qualied personnel (trained heating,
refrigeration engineers and electricians)
may carry out work on the unit and its
components.
WARNING!
Unit contains refrigerant!
Leaking refrigerant could result in personal
injury and environmental damage.Therefore:
– Switch off system.
– Notify the manufacturer’s authorised
customer service.
ATTENTION
For safety reasons:
Never disconnect the unit from the power supply,
unless the unit is being opened.
ATTENTION
Install the heat pump indoors only and operate it
only with outside air as the heat source. The air
ducts must discharge outdoors. They must not be
constricted or blocked.

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Dimensioned drawing and installation plan for the
respective model.
WARNING!
Never switch on the unit if air ducts are
mounted on the unit.
Take precautions on the fan side to prevent
injuries caused by the rotating fan (air duct
outlet above ground level: weather louvre,
air duct outlet below ground level: rain
louvre, each not included in the accessories
supplied).
ATTENTION
It is not permitted to integrate the heat pump
in ventilation systems. Use of the cooled air for
cooling purposes is not permitted.
ATTENTION
The ambient air at the place in which the heat
pump is installed, as well as the air drawn in as a
heat source, must not contain any corrosive con-
stituents!
Constituents (such as ammonia, sulphur, chlorine,
salt, sewage gases, ue gases…) can cause damage
to the heat pump, which can result in complete
failure / irreparable total damage to the heat pump!
Can be installed near the coast.
CAUTION!
In the air outlet area the air temperature is
approx. 5° K below the ambient temperature.
Under certain climatic conditions an ice layer
can therefore form in the air outlet area.
Install the heat pump so that the air blower
does not discharge into footpath areas.
Customer service
For technical information please contact a qualied installer
or the manufacturer's local partner.
SERVICE ADDRESSES
For a current list and additional partners of the
manufacturer, please visit
DE: www.alpha-innotec.de
EU: www.alpha-innotec.eu
Warranty/Guarantee
For warranty and guarantee conditions, please refer to your
purchase documents.
NOTE.
Please contact your dealer about all matters
concerning warranties and guarantees.
Disposal
When decommissioning the old unit, always comply with
local applicable laws, directives and standards concerning
the recovery, recycling and disposal of materials and
components of cooling units.
“Dismantling”.

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
How heat pumps work
Heat pumps operate on the same principle as a refrigerator:
the same technology, only with reversed benets. The
refrigerator extracts heat from food, It discharges this heat
into the room through ns at its rear.
The heat pump extracts heat from our environment:
from the air, earth or groundwater. The extracted heat is
conditioned in the unit and passed on to the heating water.
Even when it is extremely cold outside, the heat pump
draws enough heat to heat a house.
Example: sketch of a brine/water heat pump with underoor
heating:
4/4= useful energy
approx. 3/4= environmental energy
approx. 1⁄4= external
electrical energy
Area of use
Taking into consideration the ambient conditions, limits of
use and the relevant regulations, any heat pump can be used
in new or existing heating systems.
“Technical data /scope of supply” overview.
Heat metering
In addition to proof of the unit's efciency, the EEWaermeG
(German law promoting renewable energy for heating) also
requires heat metering (hereinafter referred to as WME).
Heat metering is mandatory for air/water heat pumps. Heat
metering for brine/water and water/water heat pumps only
has to be installed for a ow temperature ≥35 °C.The heat
metering must record the total thermal energy output
(heating and hot water) to the building. In heat pumps with
heat metering, the evaluation is carried out by the controller.
The controller displays the thermal energy output into 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
environment through low emissions and reduced primary
energy use.
You use the control element of the heating and heat pump
controller to operate and control the heat pump system.
NOTE.
Make sure that the controller settings are correct.
Operating manual of the heating and heat pump
controller.
To ensure that your heat pump or heat pump system
operates efciently and ecologically, please pay particular
attention to the following:
€ENERGY SAVING TIP
Avoid unnecessarily high ow temperatures.
The lower the ow temperature on the heating
water side the more efcient the system.
€ENERGY SAVING TIP
Preferably use purge ventilation. Compared to con-
tinuously open windows, it is better to air rooms
by fully opening windows for a short period, two
to three times a day (so-called “purge” ventilation);
this reduces energy consumption and your heating
bill.

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH Subject to change without notice.
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Care of the unit
You can use a damp cloth and standard cleaning products to
clean the outer surfaces of the unit.
Do not use cleaning or care products that contain abrasives,
acids and/or chlorine. Such products would irreparably
damage the surfaces and could also cause technical damage
to the unit.
Maintenance of the unit
The cooling circuit of the heat pump does not require any
regular technical maintenance.
According to EU regulation (EC) 842/2006, certain heat
pumps must be checked for leakage and a log book of the
inspections must be kept!
The criteria for whether or not it is necessary to check
for leakage and keep a log book are the hermetic tightness
of the refrigerating circuit (hermetically sealed system) and
the refrigerant capacity of the heat pump! Heat pumps with
refrigerant capacity < 3 kg do not require a log book. For
all other heat pumps, the log book is supplied with the heat
pump.
Log book for heat pumps, “Information on use of
the log book” section.
The components of the heating circuit and the heat source
(valves, expansion vessels, circulation pumps, lters, dirt
traps) should be checked and cleaned as necessary, but
at least by qualied personnel (heating or cooling system
tters).
It is best to sign a maintenance agreement with a suitably
competent company. It will arrange for the necessary main-
tenance work at regular intervals.
ATTENTION
Check regularly to ensure that the condensate can
drain out of the unit freely, without obstruction.To
this end, check the condensate pan in the unit and
the condensate drain regularly for dirt / blockages
and clean as necessary.
CLEANING AND FLUSHING UNIT COMPONENTS
CAUTION!
Unit components may be cleaned and
ushed only by customer service personnel
authorised by the manufacturer. Only use
liquids recommended by the manufacturer.
After ushing the condenser with chemical
cleaning agent, any residues must be neu-
tralised and the system ushed intensively
with water. Always note and follow the tech-
nical data of the respective heat exchanger
manufacturer.
Malfunctions
In the event of a fault, you can read out the cause of the
fault from the diagnostic program of the heating and heat
pump controller.
Operating manual of the heating and heat pump
controller.
CAUTION
Only customer service personnel authorised
by the manufacturer may carry out service
and repair work on the components of the
unit.
“Customer service” overview.
Note that no fault is displayed if the safety temperature
limiter on the electric heating element has triggered
(depending on model).
“Commissioning”, “Safety temperature limiter”
section.

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Scope of supply
Example of scope of supply packaging:
View 1:
View 2:
Unit with hermetic compressor, all safety-
relevant components for cooling circuit
monitoring, installed heating and heat
pump controller, sensors installed in
the unit to record the hot gas, heating
water ow and return temperature as
well as hose for condensate discharge
(connected on the heat pump side)
Integrated circulation pump UP 25-85 PWM
What to do rst:
Check the delivery for outwardly visible signs of
damage…
Check to make sure that the delivery is complete.
Any defects or incorrect deliveries
must be reported immediately.
NOTE.
Note the unit model. Check the direction in which
the air from the unit is discharged.
Units with the letter L in their model identier
blow out the air on the left (viewed from the oper-
ating side).
FUNCTIONALLY NECESSARY ACCESSORIES:
ATTENTION
Use only original accessories made by the manufac-
turer of the unit.
You must order the air ducts (with air duct accessories)
separately.
ADDITIONAL ACCESSORIES
The installation accessories (vibration isolators) for air/
water heat pumps for indoor installation must be ordered
separately.

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Installation and assembly
The following applies to all work to be done:
NOTE.
Always comply with the relevant local accident
prevention regulations, statutory regulations,
guidelines and directives.
NOTE.
Note the sound information for the respective
model.
“Technical data / scope of supply” overview,
“Sound” section.
INSTALLATION LOCATION
CAUTION.
Install the unit inside buildings only.
The installation room must be frost-free and dry.
WARNING!
Please note and follow the respective
relevant local standards,guidelines,directives
and regulations, especially the minimum
room volume necessary depending on the
quantity of refrigerant in the relevant heat
pump system (EN 378-1).
Refrigerant Limit value
R 134a 0.25 kg/m³
R 404A 0.48 kg/m³
R 407C 0.31 kg/m³
R 410A 0.44 kg/m³
“Technical data / scope of supply” overview,
“General unit data” section.
Minimum room volume =
Refrigerant capacity [kg]
Limit value [kg/m³]
NOTE.
If several heat pumps of the same type are installed,
only one heat pump must be considered.
If several heat pumps of different types are installed,
the heat pump requiring the largest room or space
must be considered.
TRANSPORT TO THE INSTALLATION LOCATION
To prevent damage during transport, always transport the
unit still packed to its nal installation location using a pallet
truck.
If it is not possible to transport the unit to the nal installa-
tion location using a pallet truck, you can also transport the
heat pump on a handcart or with tube handles.
Lifting the unit with tube handles.
WARNING!
The unit is not xed on the wooden pallet.
Risk of tipping/overturning during transport!
People could be injured and equipment
damaged.
– Take suitable precautions to prevent the
risk of overturning.
ATTENTION
Never use components and hydraulic connections
on the unit for transport purposes.
ATTENTION
Do not tilt the unit by more than 45° maximum (in
any direction).

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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Pass the tube handles through the holes in the frame:
1 Holes in the frame, front and rear
Make sure that the tube handles do not damage cable
harnesses and components in the unit. Feed the tube
handles carefully past cable harnesses and components
in the unit…
Lift the unit with the inserted tube handles, with at
least four people (one for each tube handle) and carry
to the place of installation.
CAUTION
Carry the unit horizontally and secure it
against slipping.
Put down the unit at the place of installation. Make
sure that the unit's baseframe is in full contact with the
surface of the oor…
Remove the tube handles…
If the electrical connection work is not carried out
immediately, re-attach the lower facade panel on the
operating side.
LIFTING THE UNIT WITH TUBE HANDLES
The LW unit can be lifted with 3⁄4” or 1” tube handles (to
be provided on site by the customer). Appropriate holes
are provided for these in the unit frame.
Remove the lower facing panels at the front and rear
of the unit.
1 Quick-release screws
2 Lower facing panel
To do this, undo the quick-release screws.Turn through
90° to the left…
Pull the lower facing panel upwards and outwards at an
angle, lift out and put in a safe place...

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PUSH-IN FAN
The fan can be pushed approx. 10 cm into the housing to
enable the unit to be transported in narrow basement
rooms and through narrow doors or corridors:
ATTENTION
Only push the fan into the housing for transport
purposes and pull it back out of the housing
immediately after transport.
Remove the lower facing panel on the fan side and
remove it from the unit. To do this, undo the quick-
release screws.Turn through 90° to the left…
1 Quick-release screws
2 Lower facing panel
Pull the lower facing panel upwards and outwards at an
angle, lift out and put in a safe place...
Remove the screws in the underside of the upper
facing panel…
Lift up the facing panel at an angle, unhook it and put it
in a safe place…
Then remove the side facing panels from the unit too
and put them in a safe place…
At the fan, thread in the two guide rods supplied with
the unit through the metal tab and fan…
Then, on both sides, hook the guide rods in the key-
hole perforation of the top metal tab inside the unit…

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Undo all four nuts (M12) of the fan's threaded ttings
inside the unit and remove together with the spring
lock washers…
Push in the fan in the direction of the evaporator, up to
the top metal tab inside the unit…
1 top metal tab inside the unit
Push the M12 x 40 (2x) bolts supplied through the fan
and the top metal tab and secure with M12 nuts…
Put down the unit at the place of installation. Make
sure that the unit's baseframe is in full contact with the
surface of the oor and the unit is horizontal…
Undo the two fastening nuts on the top metal tab and
remove the corresponding bolts.
Then pull the fan out of the unit and bolt it back
onto the unit frame (do not forget the spring lock
washers)…
Remove the guide rods and re-attach all facing panels
to the unit.
INSTALLATION
Place the unit on a stable, solid and horizontal, preferably
structural sound-insulated surface. Make sure that the oor
is designed for the weight of the heat pump.
CAUTION
I n the air outlet area the air temperature is
approx. 5 K below the ambient temperature.
Under certain climatic conditions an ice layer
can therefore form in the air outlet area.
Install the heat pump so that the air is not
blown out in the area of footpaths.
ATTENTION
Do not tilt the unit by more than 45° maximum (in
any direction).
NOTE.
Always refer to and follow the installation plan for
the respective model. Note the size and minimum
clearances.
Installation plan for the respective model.
Install the unit so that the switchbox side (= operating side)
is accessible at all times.
INSTALLING THE AIR DUCTS
ATTENTION
Only use original accessories or air ducts recom-
mended by the manufacturer.
Install the air ducts only as shown on the installation
plan applicable to your unit.
Installation plan for the respective model.

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Turn the already pushed together parts through 90°
again and make the last connection…
Use the particleboards supplied to stabilise the wall
penetration on the inside…
Insert the wall penetration in the masonry from
the outside of the building . This can either be
done during the building shell construction phase (by
bricking around the penetration)…
NOTE.
Install wall penetrations 1 cm above the nished
external façade.
1 Outside of the building masonry
2 Inert the wall penetration in the masonry
(1 cm above the nished external façade)
or subsequently (by foaming in place in the masonry):
ASSEMBLY AND INSTALLATION OF THE WALL
PENETRATION(S) (BUSHINGS)
Take the elements for assembling the wall penetra-
tion(s) from the relevant box…
As illustrated in the following sketch, rstly, push to-
gether 2 matching elements of the wall penetration(s).
Use the lubricant supplied…
Push on another element as illustrated…
Turn the already pushed together parts through 90°
and push on the last element at the bottom…

14
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
1 Wall penetration
2 Air duct
3 Rolling O-ring joint
4 Waterstop tape (do not
attach until after the unit
connections have been xed)
NOTE.
After the other end of the air duct has also been
xed onto the heat pump, seal off the opening that
still exists between the wall penetration and the air
duct by attaching the waterstop tape supplied.
FIXING THE AIR DUCTS ONTO THE HEAT PUMP
Clip on the mounting strip and use special screws to
x onto the places provided for this purpose on the
air duct for the air inlet side…
Glue the connection frame supplied onto the edge of
the air duct…
Position the air duct on the respective air opening of
the air inlet side…
At the air inlet side of the heat pump, hook 4 of the
tension springs supplied in the holes provided for this
purpose…
Hook the tension springs into the mounting strip
screwed onto the air duct…
Fix the protective caps above the mounting strip…
1 Finished external façade
NOTE.
Wall penetrations are used for xing in the
masonry opening, to avoid cold bridges with the
masonry, and to install weather and rain louvres
and wire mesh.
ASSEMBLY AND INSTALLATION OF THE AIR DUCTS
Take the elements for assembling the air ducts from
the relevant box…
The air ducts are assembled by pushing them together
as is described in the “Assembly and installation of the
wall penetration(s)” section, – .
FIXING THE AIR DUCTS IN THE WALL PENETRATION
Pull the rolling O-ring joint supplied over one end of
an air duct…
Push the air duct into the wall penetration with this
end rst.

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Repeat procedure – at the air outlet side.
NOTE.
Do not forget:
After the air ducts have been xed onto the heat
pump, seal off the opening that still exists between
the wall penetration and the air duct by attaching
the waterstop tape supplied.
NOTE.
Use suitable means to x the air ducts to the
ceiling.
INSTALLING THE FRAME TRIM
Screw the frame trim onto the wall penetration on the air
inlet and air outlet side.
NOTE.
The frame trim does not full any technical
function; it is merely for establishing a visually
attractive transition with the wall surface.
INSTALLING THE WIRE MESH AND THE WEATHER /RAIN
LOUVRE
Remove the wire mesh and weather / rain louvre
including the installation frame and xing materials
from the relevant box…
From the outside of the building, insert the installation
frame in the wall penetration of the air inlet side and
screw tight…
8 x
Insert the wire mesh in the installation frame…
Position the weather / rain louvre on the installation
frame in the wall penetration and screw on…

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Flush the heating circuit thoroughly before connecting
the unit to the heating circuit…
NOTE.
Dirt and deposits in the heating circuit can cause
malfunctions.
Install shut-off devices for the heating water outlet
(ow) and heating water inlet (return) on the heat
pump side…
NOTE.
By installing the shut-off devices, the condenser of
the heat pump can be ushed, if necessary.
Connect the unit to the xed piping of the heating
circuit via vibration isolators.You must install them to
prevent the transfer of structurally borne sound to the
xed piping.
NOTE.
Vibration isolators are available as accessories.
The connections for the heating water outlet (ow) and
heating water inlet (return) are marked accordingly on the
unit.
For details on how to position the connections,
refer to the dimensioned drawing for the respective
unit model.
8 x
NOTE.
Attach the weather louvre if the wall penetration is
above ground level.
If the wall penetration is installed in an air well
(below ground level), attach the rain louvre.
Repeat procedure – at the air outlet side.
INSTALLATION / CONNECTION TO THE HEATING CIRCUIT
ATTENTION
Integrate the unit in the heating circuit as shown in
the hydraulic diagram for the respective unit model.
It is not possible to connect several heat pumps in
parallel.
“Hydraulic integration” document.
Check to make sure that the cross-sections (diameters) and
lengths of the pipes for the heating circuit are adequately
dimensioned.
The hydraulic system must be equipped with a buffer tank,
the required volume of which depends on your unit model.
See “Buffer tank” page “Buffer tank” on page 17
ATTENTION
When installing the connections, always protect the
connections on the unit from twisting, in order to
prevent damage to the copper pipes inside the unit.

17
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH Subject to change without notice.
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Buffer tank
The hydraulic integration of the heat pump requires a buffer
tank in the heating circuit. It ensures a minimum running
time for the heat pump if the heating circuit valves are shut
off. The required volume of the buffer tank is calculated
using the following formula:
VBuffer tank =
minimum throughput heating circuit ow rate / hour
10
For the minimum throughput of the heating circuit
ow rate, see “Technical data/Scope of supply”
overview,“Heating circuit” section.
In mono-energetic air/water systems, integrate the buffer
tank in the heating water outlet (ow) upstream of the
overow valve.
Water heating
Water heating with the heat pump requires another heating
water circuit in addition (parallel) to the heating circuit.
When integrating, make sure that the hot water supply is
not fed through the buffer tank of the heating circuit.
“Hydraulic integration” document.
Hot water tank
If the heat pump is to be used to heat water, you must
integrate special hot water tanks in the heat pump system.
Choose the storage volume so that the required quantity of
hot water is available even during a power cut.
The heat exchanger surface of the hot water tank must be
dimensioned so that the heating capacity of the heat pump
is transferred with minimum temperature drop.We offer a
variety of hot water tanks for you to choose from.They are
optimally matched to your heat pump.
Integrate the hot water tank in the heat pump system as
shown in the hydraulic diagram for your system.
CONDENSATE DRAIN
The condensate precipitated from the air must be drained
through the hose for condensate discharge provided on the
unit.To this end, connect the hose for condensate discharge
with a water drain.
Positioning of the condensate discharge connec-
tion, refer to the dimensioned drawings for the
respective unit model.
1 Hose for condensate discharge inside the unit
2 Connection for condensate drain
on the outside of the unit
ATTENTION
Lay the hose for condensate discharge provided
inside the unit as a trap, as shown in the gure.
Discharge of the condensate into the sewers is permitted
only via a trap with funnel inlet, which must be accessible
at all times.
Pressure safety
Equip the heating circuit with a safety valve and expansion
vessel in accordance with local standards and guidelines.
Also install lling and draining emptying devices, shut-off
devices and non-return valves in the heating circuit.
Circulation pump
The circulation pump is installed in the unit. Only one
PWM signal is available for the circulation pump, therefore
the domestic hot water supply must be provided with the
changeover valve via the BUP outlet. Normally open equals
heating.

18
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
Feed the 230V power cable, power cable for circulation
pumps and cable for outdoor temperature sensor
through the rubber grommets in the facing panel…
•
Cut open the rubber grommets in the facing panel…
For details of the positioning of the rubber grom-
mets for the cable entry, see “dimensioned draw-
ing” for the respective unit model.
•
Push the cables through the rubber grommets in the
unit…
By pushing them in, the cables are routed inside the
unit in a closed cable duct to the terminals on the
switching plate…
Carry out the electrical connection work as shown in
the terminal diagram applicable to your unit model…
Terminal diagram for the respective model.
ATTENTION
Ensure clockwise rotary eld of the load power
supply (compressor).
Operation with the incorrect rotary direction
of the compressor 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.
Residual current circuit breaker type A is sufcient.
“Technical data / scope of supply” overview,
“Electrics” section.
NOTE.
In units with integrated electric heating element
the electric heating element is connected to 9 kW
in the factory. It can be reconnected to the 3kW
or 6 kW contactor.
For further details, refer to the sticker on the
electrical heating element.
Electrical connection work
The following applies to all work to be done:
DANGER!
Risk of fatal electric shock!
All electrical connection work must be
carried out by qualied electricians only.
Before opening the unit, disconnect the sys-
tem from the power supply - wait for 90 sec-
onds = residual voltage at inverter - and pre-
vent it from being switched back on again!
WARNING!
Note and follow the relevant EN, VDE and/
or local safety regulations during installation
and when carrying out electrical work.
Comply with technical connection require-
ments of the responsible power supply com-
pany (if required by the latter)!
NOTE.
All live cables must be stripped before they are laid
in the cable duct of the switch box!
POWER CONNECTION
If the unit is connected, open the lower facing panels
on the operating side…
“Installation”.
Open the unit's electrical switch box…
Example of an opened
electrical switchbox…

19
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH Subject to change without notice.
Subject to change without notice.
83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
has shown that the safest, most reliable and fault-free
running is achieved with so-called low-salt operation.
VDI 2035 Part I provides important information and rec-
ommendations regarding scaling and its prevention in heat-
ing 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
- the planning, design and commissioning are carried out
properly
- the system is closed in corrosion terms
- adequately dimensioned pressure maintenance is inte-
grated
- the guide values for the heating water are complied with
- and regular servicing and maintenance are carried out.
A system log should be kept, in which the relevant planning
& design data is entered (VDI 2035).
DAMAGE THAT CAN OCCUR IN CASE OF FAILURE TO
COMPLY WITH THE ABOVE
- Malfunctions and the failure of components (e.g. pumps,
valves)
- Internal and external leaks (e.g. from heat exchangers)
- Cross-section reduction and blockaging of components
(e.g. heat exchanger, pipes, pumps)
- Material fatigue
- Gas bubbles and gas cushion formation (cavitation)
- Negative effect on heat transfer (formation of coatings,
deposits) and associated noises (e.g. boiling noises, ow
noises)
LIMESCALE – THE ENERGY KILLER
Filling with untreated drinking water inevitably leads to
the precipitation of all calcium as scale. The consequence:
limescale deposits form on the heat transfer surfaces of
the heating. Efciency falls and energy costs rise. A rule of
thumb is that 1 millimetre of limescale deposit causes an
efciency loss of 10 %. In extreme cases it can even cause
damage to the heat exchangers.
NOTE.
The control unit of the heating and heat pump
controller can be connected to a computer or
network using a suitable network cable, enabling
the heating and heat pump controller to be
controlled remotely from there.
If this is required, lay a shielded network cable
(category 6, with RJ45 connector) through the unit
during the electrical connection work and route it
through the front panel of the unit, parallel to the
existing control cable of the heating and heat pump
controller.
Close the unit's electrical switch box…
Attach the lower facing panel.
Flushing, lling and venting
the system
ATTENTION
The system must be absolutely free from air before
commissioning.
WATER QUALITY OF THE FILL AND MAKE UP WATER TO
VDI 2035
PART I AND II IN WATER HEATING SYSTEMS
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 heat
transfer capacities. This means the complexity of the
systems and the material diversity are also increasing, which
plays an important role especially with regard to their
corrosivity.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

20
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83054800bUK – Translation into English of the original German operating manual ait-deutschland GmbH
WATER SOFTENING TO VDI 2035 – PART I
If the water is softened in accordance with the VDI 2035
guidelines before it is used to ll the heating system, no scale
can form.This prevents limescale deposits and the resulting
negative effects on the entire heating system, effectively and
permanently.
CORROSION – AN UNDERESTIMATED PROBLEM
VDI 2035, Part II, deals with the problem of corrosion.
Softening the heating water can prove to be insufcient.
The pH value can signicantly exceed the limit of 10. pH
values higher than 11 can set in, which even damage rubber
seals. VDI 2035, Part 1 guidelines are nevertheless fullled;
however,VDI 2035, Part 2 proposes a pH value between 8.2
and maximum 10.
If aluminium materials are used, which is the case in many
modern heating systems, a pH value of 8.5 must not be
exceeded! Because otherwise there is a threat of corrosion
– aluminium is attacked without the presence of oxygen.
Therefore, in addition to softening the heating ll and make-
up water, the heating water should also be conditioned
appropriately. This is the only way to comply with the
VDI 2035 requirements and the recommendations and
installation instructions of the heat pump manufacturer.
Part 2 of VDI 2035 also refers to the reduction in total salt
content (conductivity).The risk of corrosion is far lower if
deionised water is used than is the case if the system is
operated with salty, i.e. softened water.
Even drinking water softened beforehand contains dissolved,
corrosive salts which, due to the use of different materials
in the heating system, act as electrolytes and therefore
accelerate corrosion processes.This can ultimately result in
pitting.
ON THE SAFE SIDE WITH LOW-SALT OPERATION
With low-salt operation the problems listed above do not
occur at all, as neither corrosive salts such as sulphates,
chlorides and nitrates, nor the alkaline sodium hydrogen
carbonate are present in the heating water. The corrosive
properties of deionised water are very low and in addition,
scale cannot form. This is the ideal approach for closed
heating circuits, in particular, because low oxygen input into
the heating circuit can also be tolerated.
In general, when the system is lled with deionised water,
the pH value sets itself within the ideal range due to “self-
alkalinisation”. If necessary, a pH value of 8.2 can be very
easily alkalised by adding chemicals. In this way, optimum
protection of the entire heating system is achieved.
MONITORING
Analytical recording and monitoring of the relevant water
values and the added conditioning substances is of decisive
importance. Therefore, they should be monitored regularly
using appropriate water test equipment.
FLUSH, FILL AND VENT THE HEATING CIRCUIT AND HOT
WATER TANK
In order to vent the hot water tank the heating circuit and
the hot water supply circuit must be ushed at the same
time.
Flushing, lling and venting the heating circuit…
Venting the additional condenser of the heat pump…
•
Opening the lower facing panel…
•
Opening the vent valve…
After venting, close the lower facing panel.