Glen Dimplex System M Compact 4/6 kW User guide

Order no.: DOK41 HOIAO WxDEN EN · FD 9912
System M
Compact 4/6 kW
Installation and
Operating Instruction
Air-to-water
heat pump
in integral design
Glen
Dimplex
Thermal
Solutions
Dimplex
041HOIAOW2
061HOIAOW4

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Air-to-water heat pump 4 - 6 kW English
Table of contents
1 Please read immediately...................................................................................................................................3
1.1 Intended use............................................................................................................................................................................. 3
1.2 Legal regulations and directives ........................................................................................................................................ 3
1.3 Energy-efficient use of the heat pump............................................................................................................................ 3
2 Intended use of the heat pump ......................................................................................................................4
2.1 Area of application.................................................................................................................................................................. 4
2.2 Operating principle................................................................................................................................................................. 4
3 Scope of supply ..................................................................................................................................................5
3.1 Indoor unit ................................................................................................................................................................................. 5
3.2 Outdoor unit.............................................................................................................................................................................. 6
4 Transport..............................................................................................................................................................7
4.1 Outdoor unit.............................................................................................................................................................................. 7
4.2 Indoor unit ................................................................................................................................................................................. 7
4.3 Removing the refrigeration circuit .................................................................................................................................... 8
5 Installation ...........................................................................................................................................................9
5.1 Outdoor unit.............................................................................................................................................................................. 9
5.2 Indoor unit ...............................................................................................................................................................................10
5.3 Acoustic emissions...............................................................................................................................................................10
6 Assembly / connection.................................................................................................................................. 11
6.1 Assembly of the refrigerant line and electric wire .....................................................................................................11
6.2 Condensate drain..................................................................................................................................................................11
6.3 Connection on heating side ..............................................................................................................................................11
6.4 Domestic hot water connection ......................................................................................................................................12
6.5 Temperature sensor connection .....................................................................................................................................13
6.6 Electrical connection ...........................................................................................................................................................14
6.7 Refrigerant pipe connections ...........................................................................................................................................17
7 Commissioning ................................................................................................................................................ 20
7.1 General......................................................................................................................................................................................20
7.2 Preparation..............................................................................................................................................................................20
7.3 Procedure ................................................................................................................................................................................20
8 Cleaning / maintenance ................................................................................................................................ 21
8.1 Maintenance ...........................................................................................................................................................................21
8.2 Cleaning the indoor unit .....................................................................................................................................................21
8.3 Cleaning the domestic hot water cylinder....................................................................................................................21
8.4 Cleaning the outdoor unit ..................................................................................................................................................21
9 Faults / troubleshooting................................................................................................................................ 22
10 Decommissioning / disposal ........................................................................................................................ 22
11 Device information ......................................................................................................................................... 23
12 Dimension drawing......................................................................................................................................... 25
12.1 Dimension drawing outdoor unit.....................................................................................................................................25
12.2 Dimension drawing indoor unit ........................................................................................................................................26
12.3 Dimension drawing legend................................................................................................................................................27
13 Diagrams ........................................................................................................................................................... 28
13.1 Characteristic curve heating 4 kW ..................................................................................................................................28
13.2 Characteristic curve heating 6 kW ..................................................................................................................................29
14 Product information as per Regulation (EU) No 813/2013, Annex II, Table 2.................................. 30

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English Air-to-water heat pump 4 - 6 kW
16 Information on the use of data..................................................................................................................... 33
17 Declaration of conformity............................................................................................................................. 34

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Air-to-water heat pump 4 - 6 kW English
1 Please read immediately
1.1 Intended use
This device is only intended for use as specified by the manu-
facturer. Any other use beyond that intended by the manufac-
turer is prohibited. This requires the user to abide by the rele-
vant project planning documents. Please refrain from
tampering with or altering the device.
1.2 Legal regulations and directives
This heat pump is designed for use in a domestic environment
according to Article 1, Paragraph 2 k) of EC directive 2006/42/
EC (machinery directive) and is thus subject to the require-
ments of EU directive 2014/35/EU (low-voltage directive). It is
thus also intended for use by non-professionals for heating
shops, offices and other similar working environments, agricul-
tural establishments and hotels, guesthouses and other resi-
dential buildings.
The construction and design of the heat pump complies with all
relevant EU directives, DIN and VDE regulations.
When connecting the heat pump to the power supply, the rele-
vant VDE, EN and IEC standards are to be adhered to. Any fur-
ther connection requirements stipulated by local utility compa-
nies must also be observed.
When connecting the heating system, all country-specific reg-
ulations must also be adhered to.
This unit can be used by children aged 8 and over and by per-
sons with limited physical, sensory or mental aptitude or lack of
experience and/or knowledge, providing they are supervised or
have been instructed in the safe use of the unit and understand
the associated potential dangers.
Children must not play with the device. Cleaning and user
maintenance must not be carried out by children without su-
pervision.
!!
ATTENTION!
Work on the heat pump must only be performed by author-
ised and qualified after-sales service technicians!
HINWEIS
ºººººº
NOTE
When operating or maintaining a heat pump, the legal require-
ments of the country where the heat pump is operated apply.
Depending on the refrigerant fill quantity, the heat pump
must be inspected for leaks at regular intervals by a certified
technician, and these inspections must be recorded.
1.3 Energy-efficient use of the heat
pump
By operating this heat pump you are helping to protect our en-
vironment. The heating system must be properly designed and
dimensioned to ensure efficient operation. It is particularly im-
portant to keep water flow temperatures as low as possible in
heating operation. All connected heat consumers should there-
fore be suitable for low flow temperatures. Raising the heating
water temperature by 1 K corresponds to an increase in electric
energy consumption of approx. 2.5 %. Low-temperature heat-
ing systems with flow temperatures between 30 °C and 50 °C
are particularly well-suited for energy-efficient operation.

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English Air-to-water heat pump 4 - 6 kW
2 Intended use of the heat pump
2.1 Area of application
The air-to-water heat pump is to be used exclusively for heating
of heating water and domestic hot water. It can be used in new
or existing heating systems.
The heat pump is suitable for mono energy operation at
outside air temperatures as low as -22 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 20 °C dur-
ing continuous operation.
It is not designed for the increased heat consumption required
when a building is being dried out. For this reason, the addi-
tional heat consumption should be met using special devices
provided by the customer.
2.2 Operating principle
Surrounding air is drawn in by the fan and fed through the evap-
orator (heat exchanger). The evaporator cools the air, i.e. ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increas-
ing its pressure with the aid of the electrically driven compres-
sors. It is then transferred to the heating water via the liquefier
(heat exchanger).
Electrical energy is used to raise the temperature level of the
heat from the environment. Because the energy extracted from
the air is transferred to the heating water, this type of device is
referred to as an air-to-water heat pump.
The air-to-water heat pump consists of the main components
evaporator, fan and expansion valve, as well as the compres-
sors, the liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the
evaporator in the form of frost, reducing the transfer of heat.
Uneven accumulation during this process does not indicate a
fault. The evaporator is defrosted automatically by the heat
pump as required. Under certain atmospheric conditions,
steam may be emitted from the air outlet.

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Air-to-water heat pump 4 - 6 kW English
3 Scope of supply
3.1 Indoor unit
Hydraulic systems
1) Combination cylinder, consisting of:
26 l buffer tank and domestic hot water cylinder
with 151 l capacity
2) Domestic hot water sensor
3) Flange with magnesium anode
4) Drainage domestic hot water cylinder
5) Purging
6) Safety valve, start-to-leak pressure 2.5 bar
7) Expansion vessel (18 l)
8) 3-way reversing valve for generating domestic hot water
9) Switch box with heating controller
10) Overflow valve to guarantee the minimum heating water
flow rate (to be set by the installer)
11) Universal hardware interface
12) Electric additional heater (2, 4 or 6 kW) for higher domestic
hot water temperatures and for heating support
13) Regulated circulating pump for an unmixed heating circuit
14) Test connection expansion vessel
Refrigeration circuit
15) Filter dryer
16) Refrigeration circuit controller switch box
17) Compressor
18) 4-way reversing valve
19) Liquefier
20) Connections for refrigerant lines
2
3
4
9
8
6
5
7
10
12
13
11
14
17
19
16
15
18
1
20

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English Air-to-water heat pump 4 - 6 kW
3.2 Outdoor unit
1) Evaporator
2) Fan
3) Expansion valve
4) Switch box
5) Connection for refrigerant line
1
2
3
4
5

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Air-to-water heat pump 4 - 6 kW English
4 Transport
4.1 Outdoor unit
A pallet should be used to transport the heat pump to its final
installation location. The outdoor unit can be transported with a
lift truck, hand truck or similar.
Once the side sections have been removed, the outdoor unit
can be lifted by the cover. For this, loosen the two screws at the
top, tilt the metal plate to the side and remove at the top (see
step 1-3)
4.2 Indoor unit
A lift truck is suited for transporting the unit on a level surface.
Carrying straps may be used if the heat pump needs to be
transported on an uneven surface or carried up or down stairs.
These straps can be passed directly underneath the pallet.
To lift from the pallet, the indoor unit can be tilted back by up to
45° and lifted by the handles on the back at the top. Tilting over
45° is not permitted without removing the refrigeration circuit
beforehand.
To remove the refrigeration circuit, remove the side plate at the
bottom right.
The casing panels must be dismantled in the order outlined be-
low.
The bottom side panel must be removed first.
For this, loosen the screws on the bottom side section, turn out
the panel slightly and pull it out to the front (see step 1-3).
Secondly, remove the top side panel.
To do this, loosen the screws, fold out the panel slightly and re-
move the facade panel at the top (see step 4-6).
The front panel can then be removed.
For this, loosen the 4 screws on the frame at the side. Push the
panel approx. 10 mm to the right, then push it forwards slightly
and remove at the top (see step 7-9). Disconnect the connec-
tion cables to the display on the universal hardware interface.
1.
2.
3.
1.
45°
max.
Tilting dimension 2190
2.
3.
1.
1.
4.
4.
5.
6.
7.
7.
7.
7.
8.
9.

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English Air-to-water heat pump 4 - 6 kW
4.3 Removing the refrigeration
circuit
To make transport easier, the refrigeration circuit can be dis-
mantled and transported separately. Removing it enables the
indoor unit to be transported horizontally.
The following connections must be disconnected:
1) Disconnect the water circuit connection
2) Disconnect the plug connections on the refrigeration cir-
cuit switch box
3) Loosen the mounting screws
4) Pull the refrigeration circuit out at the side and transport it
to the intended location
!!
ATTENTION!
In installed and dismantled state, the refrigeration circuit may
only be tilted by a maximum of 45° (in each direction).
After the final positioning at the installation location, remove
the transport fastening on the sprung floor of the compressor
on both sides.
!!
ATTENTION!
Before commissioning, the transport fastening must be re-
moved.
1. (2x)
3. (2x)
4.
2. (2x)

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Air-to-water heat pump 4 - 6 kW English
5 Installation
5.1 Outdoor unit
Among other things, when selecting the installation locations
for the indoor and outdoor units, ensure that the required
length of refrigerant line is as short as possible. The standard
length of a refrigerant line is 3m. It is possible to have a special-
ist extend the refrigerant line to a length of 7m up to a maxi-
mum of 10m, provided that the information in see cap. 6.7 on
page 17 has been heeded.
HINWEIS
ºººººº
NOTE
In snowy areas, the foundation must be of a sufficient height
to guarantee a free air intake.
HINWEIS
ºººººº
NOTE
The cold air is blown out downwards at the side and can result
in black ice on paths and platforms.
The outdoor unit must be installed on a permanently even,
smooth and horizontal surface. The entire base of the frame
should lie directly on the floor. To prevent small animals from
entering the inside of the device, the connection hole in the
base plate must be sealed where necessary.
The outdoor unit is designed for installation close to walls on
even ground and for installation on a wall bracket. The outdoor
unit must always be fixed in place at the installation location
(Cap. 12.1 on page 25). The responsibility for the heat pump in-
stallation lies with the specialist system construction company.
During the installation, local requirements such as building reg-
ulations, static load of the building, and wind exposure must be
accounted for.
It must be possible to carry out maintenance work without hin-
drance. This is ensured if the clearance displayed below is
maintained.
The specified dimensions are valid for stand-alone installation
only.
If multiple outdoor units are set up next to each other, the re-
quired minimum distance at the side adds up. Ensure that the
cold expelled air is not sucked in again.
HINWEIS
º
ºº
º
ºº
NOTE
Do not restrict or block the area around the intake or the air
outlet area.
HINWEIS
º
ºº
º
ºº
NOTE
Observe country-specific building regulations!
HINWEIS
º
ºº
º
ºº
NOTE
The physical impacts must be observed for installation close
to walls. No windows or doors should be present in the area
surrounding the air outlet of the fan.
HINWEIS
ºººººº
NOTE
In cases of installation close to a wall, there may be more sed-
iment in the intake and air outlet area due to the air flow. The
colder outside air outlet should discharge in such a way as to
not increase the heat losses in heated neighbouring rooms.
HINWEIS
º
ºº
º
ºº
NOTE
Installation in a hollow or in an inner courtyard is not permit-
ted because cooled air collects at ground level and is drawn in
again by the heat pump during extended periods of operation.
1,0 m
0,3 m
0,5 m
0,5 m

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English Air-to-water heat pump 4 - 6 kW
5.2 Indoor unit
The indoor unit must be installed in a frost-free, dry room on an
even, smooth and horizontal surface. The entire base of the
frame should lie directly on the floor to ensure an adequate
soundproof seal. The surface must have sufficient load bearing
capacity for the weight of the heat pump and the domestic hot
water quantity.
The indoor unit must be installed so that maintenance work can
be carried out without hindrance. This can be ensured by main-
taining a clearance of approx. 1 m in front of and to the right of
the heat pump.
Neither frost nor temperatures higher than 35 °C must occur in
the installation location at any time of the year.
The minimum volume of the room where the heat pump is in-
stalled must be no less than the following value depending on
the refrigerant quantity in the device:
If the refrigerant quantity is increased, the room volume must
be calculated according to the following formula:
[minimum permissible room volume m³] =
[refrigerant quantity in kg] / [permissible concentration
0.39 kg/m³]
5.3 Acoustic emissions
The heat pump operates silently due to efficient sound insula-
tion. Internal insulation measures should be carried out to pre-
vent vibrations from being transmitted to the foundation or to
the heating system.
Perfor-
mance level
Amount of
refrigerant
Permissible
concentrationin
the installation
room according
to DIN EN 378
(Tab. C.3)
Minimum per-
missible room
volume for
indoor installa-
tion
4kW 2.00kgR410A 0.39kg/m³ 5.13m³
6kW 2.38kgR410A 0.39kg/m³ 6.10m³
1,0 m
1,0 m

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6 Assembly / connection
6.1 Assembly of the refrigerant line
and electric wire
The refrigerant lines and electric wires for connecting the in-
door unit with the outdoor unit must be ordered separately as
accessories.
To route the connection cables, create wall openings at a suita-
ble point. The wall opening must be protected from water pen-
etration according to the local conditions.
The wall openings should be sealed again correctly once the
routing work is complete. (For connecting the electric wire, see
cap. 6.6 on page 14, for connecting the refrigerant line, see
cap. 6.7 on page 17).
6.2 Condensate drain
Condensate that forms during operation must be drained off
frost free. To ensure proper drainage, the outdoor unit must be
mounted horizontally.
The condensate tray offers various options for the condensate
drain:
Foundation covered with gravel. The leaching should be
min. 1.5 l per kW of heat output per day, and the diameter
of the drain pipe should be at least 50 mm.
Channel into a waste water, rain water or drainage channel
If the condensate drain is installed at risk from frost, it must be
protected from freezing with a condensate drain heater, which
is available as a special accessory.
This must be connected in the outdoor unit, parallel to the noz-
zle ring heater (E4).
!!
ATTENTION!
The frost line can vary according to the climatic region. The
regulations of the countries in question must be observed.
6.3 Connection on heating side
Before connecting the heating system to the heat pump, the
heating system must be flushed to remove any impurities, resi-
due from sealants, etc. Any accumulation of deposits in the liq-
uefier may cause the heat pump to completely break down.
To enable better maintenance of the installed heating circuit
components, a purging option and shut-off option must be im-
plemented upstream and downstream of the indoor unit.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested.
When doing so, it must be ensured that all heating circuits and
isolating valves are open and that the 3-way reversing valve is in
heating operation (pos. 1 factory default). Fill the heating sys-
tem at the fill and drain cock (pos. 2) until system pressure (ap-
prox. 1.5 bar) is reached. A suitable fill hose with a pressure
gauge should be used. When doing so, check all connections
and the entire heating system for leakages. The heating system
should be purged at the highest point (pos. 3, e.g. radiator, heat
pumps connection).
After all of the air has been purged here, the indoor unit must be
purged at the valves of the electric auxiliary heating (pos. 4) and
domestic hot water heat exchanger (pos. 5) until the heating
water also exits free of bubbles here.
When the power supply is attached, the reversing valve can be
switched between heating operation and domestic hot water
operation in the operating unit (User Interface) in the installer
level under control functions for improved purging.
Finally, close the fill and drain cock, check the system pressure
and top up if necessary.
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of
drinking water quality
(colourless, clear, free of sediments)
Filling water and make-up water must be filtered (max.
pore size 5 µm).
Scale formation in domestic hot water heating systems cannot
be avoided, but in systems with flow temperatures below 60 °C,
the problem can be disregarded. With high-temperature heat
pumps and in particular with bivalent systems in the higher per-
formance range (heat pump + boiler combination), flow tem-
peratures of 60 °C and more can be achieved. The following
standard values should therefore be adhered to with regard to
the filling and make-up water according to VDI 2035, sheet 1:
The total hardness values can be found in the table.
5
3
3
2
4
4
1

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English Air-to-water heat pump 4 - 6 kW
Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends the use of fully demineralised
water and a pH stabiliser to minimise the risk of corrosion in the
heat pump and heating system.
!!
ATTENTION!
With fully demineralised water, it is important to ensure that
the minimum pH value of 7.5 (minimum permissible value for
copper) is complied with. Failure to comply with this value can
result in the heat pump being destroyed.
Minimum heating water flow rate
The minimum heating water flow rate of the heat pump is guar-
anteed by the installed overflow valve. The procedure for set-
ting an overflow valve is described in the chapter „Commission-
ing“. When the minimum heating water flow rate is undershot,
the plate heat exchanger in the refrigeration circuit can freeze,
which can lead to total loss of the heat pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into
account during planning. With design temperatures below
30 °C in the flow, the design must be based on the max. volume
flow with 5 K spread for A7/W35.
The specified nominal flow rate (see “Device information”) must
be assured in all operating statuses. The installed flow rate
monitoring is used only for switching off the heat pump in the
event of an unusual and abrupt drop in the heating water flow
rate and not to monitor and safeguard the nominal flow rate.
Frost protection
A method of manual drainage should be provided for heat
pumps which are exposed to frost. The frost protection func-
tion of the heat pump manager is active whenever the heat
pump manager and the heat circulating pump are ready for op-
eration. The system must be drained if the heat pump is taken
out of service or in the event of a power failure. The heating cir-
cuit should be operated with a suitable frost protection if heat
pump systems are implemented in buildings where a power
failure can not be detected (holiday home).
6.4 Domestic hot water connection
Installation and commissioning must be performed by an au-
thorised specialist company. The entire system, including all
factory-assembled components, should be inspected to ensure
that everything is working properly and that there is no leakage.
The enamelled tank in accordance with DIN 4753 is suitable for
drinking water.
The following materials can be used in the consumer circuit in
the domestic hot water circuit:
Copper
Stainless steel
Brass
Plastic
Depending on the materials used in the domestic hot water
system (customer installation), material incompatibility may
lead to corrosion damage. This especially applies to zinc-plated
materials and materials containing aluminium. If there is a risk
of water contamination during operation, install a suitable filter.
The maximum permissible operating overpressure indicated on
the type plate must not be exceeded. It may be necessary to
mount a pressure reducer.
Ensure that the water supply is turned on and the cylinder is
filled before start-up.
The domestic hot water cylinder must be equipped with a certi-
fied, spring-loaded membrane safety valve on-site. A shut-off
device must not be installed between the cylinder and the
safety valve. The operational reliability of the valve must be
checked at regular intervals. We recommend having an annual
service inspection carried out by a qualified specialist company.
Total heat
output in
kW
Total
Alkaline earths
in mol/m³ and/
or mmol
Specific system volume
(VDI 2035) in l/kW
< 20 20 < 50 50
Total hardness in °dH
< 50 2.0 16.8 11.2
< 0.111
50 - 200 2.0 11.2 8.4
200 - 600 1.5 8.4 < 0.111
> 600 < 0.02 < 0.111
1. This value lies outside the permissible value for heat exchangers
in heat pumps.

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6.5 Temperature sensor connection
The following temperature sensors must also be mounted:
Outside temperature (R1) is (NTC-2)
The following temperature sensors are already installed:
Return temperature (R2) installed (NTC-10)
Demand sensor (R2.2) installed (NTC-10)
Flow rate monitoring with flow sensor (R3.1) installed
(PT1000)
Domestic hot water temperature (R3) installed (NTC-10)
6.5.1 Sensor characteristic curves
The temperature sensors to be connected to the heat pump
manager must correspond to the values specified in the table.
6.5.2 Mounting the outside temperature
sensor
The temperature sensor must be mounted in such a way that all
weather conditions are taken into consideration and the meas-
ured value is not falsified.
Mount on the external wall on the north or north-west side
where possible
Do not install in a "sheltered position" (e.g. in a wall niche or
under a balcony)
Not in the vicinity of windows, doors, exhaust air vents, ex-
ternal lighting or heat pumps
Not to be exposed to direct sunlight at any time of year
Temperature in °C -20 -15 -10 -5 0 5 10
NTC-2 in k14.6 11.4 8.9 7.1 5.6 4.5 3.7
NTC-10 in k67.7 53.4 42.3 33.9 27.3 22.1 18.0
PT 1000 in k0.92 0.94 0.96 0.98 1.0 1.02 1.04
15 20 25 30 35 40 45 50 55 60
2.9 2.4 2.0 1.7 1.4 1.1 1.0 0.8 0.7 0.6
14.9 12.1 10.0 8.4 7.0 5.9 5.0 4.2 3.6 3.1
1.06 1.08 1.1 1.12 1.14 1.16 1.18 1.2 1.22 1.24
Dimensioning parameter sensor lead
Conductor material Cu
Cable-length 50 m
Ambient temperature 35 °C
Laying system B2 (DIN VDE 0298-4 /
IEC 60364-5-52)
External diameter 4-8 mm

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English Air-to-water heat pump 4 - 6 kW
6.6 Electrical connection
6.6.1 Circuit diagram
Symbol legend, see cap. 6.6.2 on page 15
Equipment marking, see cap. 6.6.3 on page 15

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Air-to-water heat pump 4 - 6 kW English
6.6.2 Symbol legend 6.6.3 Equipment markings
Connector
Plug connection
Compressor / refrigeration circuit
Fan / outdoor unit
Electrical distribution system
Temperature sensor
Floating contact
Controller / WPM
Heating / 2nd heat generator
Pump / hydraulics
Indoors
Outdoors
Router
LAN
Domestic hot water
Heat exchanger
Smart-RTC (Intelligent room temperature controller)
+A100 Refrigeration circuit
+A110 Outdoor unit
+A200 Hydraulics /WPM
+A210 Master unit
+A220 Expansion module WPM
+A300 Electrical distribution system
+A350 Router
+A400 Hydraulic installation (general)
+A420 Domestic hot water
B3 domestic hot water thermostat
E10.1 Electrical heater
H5 Remote fault indicator
K21 Flange heater
K22 Utility block
K23 Disable contactor
K31 Circulation system requirements
M13 Heat pump heating circuit 1
M15 Heat pump heating circuit 2
M16 Auxiliary circulating pump
M18 Domestic hot water circulating pump
M24 Domestic hot water circulation pump
N24 Smart-RTC
N27 Smart grid
R1 External sensor
R2.2 Demand sensor
R3 Domestic hot water sensor
X1 Plug load feed
X2 Plug control voltage
X5.x Communication
Xx Connector

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English Air-to-water heat pump 4 - 6 kW
6.6.4 Electrical connection general
All connection cables must be provided on-site. The cable type
(cross-section, conductor type, etc.) must be chosen taking
into account the relevant electrical parameters (e.g. power, cur-
rent, voltage, etc.) and the applicable VDE, EN and VNB regula-
tions. Information on this can be found in the device informa-
tion and the electrical documentation as a planning aid.
!!
ATTENTION!
The plugs are protected against being pulled. They must be
released with a small screwdriver before disconnecting.
6.6.5 Electrical connection indoor unit
For operating the heat pump, at least the following cables / sig-
nals must be connected:
Supply voltage / refrigeration circuit
An all-pole disconnecting device with a contact gap of at
least 3 mm (e.g. utility blocking contactor or power contac-
tor) must be installed in the refrigeration circuit power sup-
ply. A 3-pole circuit breaker with joint tripping of all outer
conductors (trip current in accordance with device infor-
mation) provides the short circuit protection taking into ac-
count the layout of the internal wiring. The relevant com-
ponents in the heat pump contain an internal overload
protection.
For connecting on the switch box of the refrigeration cir-
cuit on +A100-X1, check for the clockwise rotating field of
the load feed.
Phase sequence: L1, L2, L3.
!!
ATTENTION!
Ensure the rotary field is clockwise when connecting the
mains cables (if the rotary field is not clockwise, the heat
pump will not work properly, is very loud and may cause dam-
age to the compressor).
Communication / control voltage (hydraulics <-> refrigera-
tion circuit)
The communication and control voltage cable from the hy-
draulic switch box (with heat pump manager) to the refrig-
eration circuit are already pre-wired and end on the plugs
+A100-X2 (control voltage) and +A100-X5.1 (communica-
tion). These may still have to be inserted
Control voltage
The three-core supply cable for the heat pump manager
(+A200-N1) is fed into the heat pump to the hydraulic
switch box +A200-X2. The supply cable (L/N/PE ~230 V,
50 Hz) must have a continuous voltage (+A300). For this
reason, it should be tapped upstream from the utility
blocking contactor or be connected to the household cur-
rent, because otherwise important protection functions
could be lost during a utility block.
Utility block
The utility blocking contactor (K22) with 3 main contacts
(1/3/5 // 2/4/6) and an auxiliary contact (NO contact 13/
14) should be dimensioned according to the heat pump
output and must be supplied on-site. The potential-free
NO contact of the utility blocking contactor (13/14) is
wired to the hydraulic switch box and must be connected
on the plug +A200-XK22 there. Caution! Extra-low volt-
age!
External sensor
The external sensor is connected to the hydraulic switch
box via the +A200-XR1 plug
Supply voltage hydraulics
For the power supply to the 2nd heat generator, a wire
must be routed to the device according to the power (2,4,6
kW configurable) and connected to the hydraulic switch
box on plug +A400-X1.
In delivery state, the 2nd heat generator is configured to
6kW to guarantee that the increased heat consumption is
met while drying out the building. In regular operation, this
must be adapted to the actual required additional heating
output (integrated system label).
To reduce it to 4 or 2 kW, one or two connections between
+A400-K20 (relay 2nd heat generator) and +A400-F17
(safety temperature limiter)- both located in the hydraulic
switch box - must be removed.
6.6.6 Electrical connection outdoor unit
A power supply (plug +A110-X1 <-> +A100-XA110) and com-
munication line (plug +A110-X5 <-> +A100-X5.2) must be
routed parallel to the refrigerant line between the refrigeration
circuit and the outdoor unit.
HINWEIS
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NOTE
The assignment of the heat pump manager is system-de-
pendent and outlined in the Quick Installation Guide. The
functions on the heat pump manager are also documented on
a system-dependent basis.
6.6.7 LAN / network connection
The heat pump is only designed for connection to the internet
via a router. This ensures that the user can access the system at
any time for setting parameters or for reading out information.
Maintenance work or software updates are much easier.
A conventional network cable (Cat. 5) is required for connec-
tion, which is connected between an external router (+A350)
and the network interface (+A210) of the indoor unit.

www.gdts.one DOK41 HOIAO WxDEN · FD 9912 17
Air-to-water heat pump 4 - 6 kW English
6.7 Refrigerant pipe connections
!!
ATTENTION!
Work on the system must only be performed by authorised
and qualified after-sales service technicians.
Certain requirements with regard to pipe length and rise must
be complied with when installing refrigerant pipes. Once all
conditions are met, the connection of the connecting pipe from
the outdoor unit to the indoor unit can begin.
6.7.1 Requirements for the pipe length
and rise
Abb. 6.1:
The indoor unit of the heat pump is already filled with refriger-
ant. The standard pipe length is 3 m. Up to a length of 7 m, no
additional refrigerant filling is required. For pipe lengths over
7 m, the system must be filled with additional refrigerant in ac-
cordance with the table.
!!
ATTENTION!
Incorrect filling with refrigerant could lead to faults during op-
eration.
!!
ATTENTION!
The length of the refrigerant line is calculated based on the
total line length from the respective connection point of the
indoor unit to the outdoor unit.
Incorrect refrigerant filling or refrigerant lines over 10 m result
in a risk of faults during operation and a complete failure of
the heat pump.
*Example: When installing the 6 kW model at a distance of
10 m, 225 g refrigerant must be added according to the follow-
ing calculation: (10 - 7) x 75 g = 225 g
HINWEIS
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ºº
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NOTE
If the indoor unit is mounted 2.5 m or more metres higher or
lower than the outdoor unit, a cooling technology specialist
must perform a separate check to ensure that the devices for
conveying the oil up and down the pipes have been installed
correctly in the exhaust gas pipe. The maximum rise (B) be-
tween the indoor and outdoor units is 5 m.
HINWEIS
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ºº
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NOTE
The specified operating data of the device refers to the stand-
ard pipe length, see device information.
6.7.2 Preparation for pipework
The preparation of the pipework takes place in five steps. One
main cause of refrigerant leaks is incorrect flanging. Flanging
must be carried out carefully and according to the following
steps.
Step 1: Cut pipes
Use the installation kit for pipes
Measure the distance between the indoor and outdoor
unit.
Cut the pipes slightly longer than the measured distance.
Step 2: Removing burrs
Remove all burrs from the interface of the pipework.
Hold the pipe end downwards so that no burrs can fall into
the pipe.
Step 3: Inserting screw nuts
Remove the screw nuts on the indoor and outdoor unit.
Insert the screw nuts into the deburred pipe.
No nuts can be inserted into the pipe after flanging.
Model
Pipe size (mm)
(external diame-
ter and wall
thickness)
Length A (m) *additional
refrigerant
(g/m)
Gas Liquid Normal Min. Max.
4 kW 12x1 10x1 7 3 10 75
6 kW 12x1 10x1 7 3 10 75
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
max. 5 m max. 5 m
Copper pipe
90qTilted Uneven Raw
Pipe
Reamer
Hold facing
downwards
Screw nut
Copper pipe

18 DOK41 HOIAO WxDEN · FD 9912 www.gdts.one
English Air-to-water heat pump 4 - 6 kW
Step 4: Flanging
Flanging must be carried out as follows with a flanging tool
for R-410A refrigerant as shown in the figure.
Hold the copper pipe steady in a mould with the dimen-
sions shown in the bottom table.
Step 5: Checks
Compare the flanging with the figure on the right.
If the flanging is visibly damaged, cut the relevant section
off and repeat the flanging.
6.7.3 Pipe connections
The pipe connections on the indoor unit and outdoor unit take
place in two steps.
Step 1: Initial fastening
Align the centre of the pipe and tighten the screw nuts by
hand.
Step 2: Fastening
Tighten the screw nuts with a spanner.
Torques
6.7.4 Leak test and evacuation
Air and moisture in the cooling system have unwanted effects
as outlined below.
1) The pressure in the system increases.
2) The operating current increases.
3) The cooling (or heating) output falls.
4) Moisture in the cooling circuit can freeze and block the
capillary tubes.
5) Water can cause corrosion on parts in the cooling
system.
This means that the connection pipes must be checked for
leaks and pumped empty to remove any moisture and non-
condensable gases from the system.
Step 1: Preparation
Ensure that every pipe (liquid and intake side) between the in-
door and outdoor unit is connected correctly. Ensure that both
maintenance valves on the liquid and intake of the indoor unit
are closed at this point.
Step 2: Leakage tightness test
Connect a dry nitrogen gas cylinder (with Schrader) on the
maintenance valve.
Apply 40 bar dry nitrogen to the system. Close the cylinder
valve once the test pressure is reached. The next step is to
search for leaks with leak detection spray.
HINWEIS
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NOTE
In order to prevent liquid nitrogen from entering the cooling
system, the top side of the gas cylinder must be higher than
the bottom side when pressure is building in the system.
1) All pipe connections (internal and external) must be
checked for leaks with liquid soap. Bubbles indicate a leak.
The soap must then be wiped away with a clean cloth.
2) If no leaks are found on the system, drain off the nitrogen.
External diameter "A"
mm mm
10 1.5 ~ 1.7
15.88 1.6 ~ 1.8
External diameter Torque
mm Nm
10 34 - 42
12 65 - 81
Rail
Copper pipe
Clamp Red arrow marking
Cone
Bracket
Handle
Rail
"A"
Slanting
The inside shines with no scratches
Smooth all round
The same length
all round
Damaged
surface
Cracked
Uneven
thickness
= Incorrect flanging =
Pipework of
the indoor system
Screw nut
Pipework
Torque spanners
Pipework of the indoor system
Open-end spanner (fixed)
Connection pipe
Screw nut