Glen Dimplex LA 3860 User guide

Order no.: 452167.66.48-EN EN · FD 0305
LA 3860
Installation and
Operating Instruction
Air-to-Water
Heat Pump for
Outdoor Installation
Glen
Dimplex
Deutschland
Dimplex

www.dimplex.de 452167.66.48-EN · FD 0305 EN-1
LA 3860 English
Table of contents
1 Safety notes..................................................................................................................................................EN-2
1.1 Symbols and markings...................................................................................................................................................EN-2
1.2 Intended use......................................................................................................................................................................EN-2
1.3 Legal regulations and directives .................................................................................................................................EN-2
1.4 Energy-efficient use of the heat pump.....................................................................................................................EN-2
2 Purpose of the heat pump ........................................................................................................................EN-3
2.1 Application .........................................................................................................................................................................EN-3
2.2 Operating principle..........................................................................................................................................................EN-3
3 Scope of supply ...........................................................................................................................................EN-4
3.1 Basic device .......................................................................................................................................................................EN-4
3.2 Switch box ..........................................................................................................................................................................EN-4
3.3 Heat pump manager .......................................................................................................................................................EN-4
4 Transport .......................................................................................................................................................EN-5
5 Installation ....................................................................................................................................................EN-5
5.1 General.................................................................................................................................................................................EN-5
5.2 Condensate pipe ..............................................................................................................................................................EN-6
6 Assembly .......................................................................................................................................................EN-6
6.1 General.................................................................................................................................................................................EN-6
6.2 Connection on heating side .........................................................................................................................................EN-6
6.3 Water Quality in Heating Systems..............................................................................................................................EN-6
6.4 Electrical connection ......................................................................................................................................................EN-9
7 Start-up....................................................................................................................................................... EN-10
7.1 General.............................................................................................................................................................................. EN-10
7.2 Preparation...................................................................................................................................................................... EN-10
7.3 Procedure ........................................................................................................................................................................ EN-10
8 Cleaning / maintenance ......................................................................................................................... EN-11
8.1 Maintenance ................................................................................................................................................................... EN-11
8.2 Cleaning the heating system .................................................................................................................................... EN-11
8.3 Cleaning the air system............................................................................................................................................... EN-12
9 Faults / troubleshooting......................................................................................................................... EN-12
10 Decommissioning / disposal ................................................................................................................. EN-12
11 Device information .................................................................................................................................. EN-13
12 Product information as per Regulation (EU) No 813/2013, Annex II, Table 2........................... EN-15
13 Dimension Drawings................................................................................................................................ EN-16
13.1 Dmension Drawing ....................................................................................................................................................... EN-16
14 Diagrams .................................................................................................................................................... EN-17
14.1 Characteristic curves for heating operation ........................................................................................................ EN-17
14.2 Operating limits diagram heating ............................................................................................................................ EN-18
15 Integration diagram ................................................................................................................................. EN-19
15.1 Hydraulic integration diagrams ................................................................................................................................ EN-19
15.2 Legend.............................................................................................................................................................................. EN-20
16 Declaration of Conformity ..................................................................................................................... EN-21

EN-2 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
1Safetynotes
1.1 Symbols and markings
Particularly important information in these instructions is
marked with CAUTION! and NOTE.
CAUTION!
!
!
Immediate danger to life or danger of severe personal injury or
significant damage to property.
NOTE
º
ºººº
Risk of damage to property or minor personal injury or
important information with no further risk of personal injury
or damage to property.
1.2 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.
1.3 Legal regulations and directives
This heat pump is designed for use in a domestic environment
according to Article 1, Paragraph 2 k) of EU 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, in agri-
cultural establishments and in hotels, guest houses and similar
/ other residential buildings.
The construction and design of the heat pump complies with all
relevant EU directives, DIN/VDE regulations (see CE declaration
of conformity).
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 the network opera-
tor must also be observed.
When connecting the heating system, all applicable regulations
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.
CAUTION!
!
!
When operating or maintaining a heat pump, the legal
requirements of the country where the heat pump is operated
apply. Depending on the refrigerant quantity, the heat pump
must be inspected for leaks at regular intervals by a certified
technician, and these inspections must be recorded.
More information can be found in the accompanying log book.
1.4 Energy-efficient use of the heat
pump
By operating this heat pump, you are helping to protect the en-
vironment. A prerequisite for energy-efficient operation is the
correct design of the heat source system and heating system.
It is particularly important for the efficiency of a heat pump to
keep the temperature difference between heating water and
heat source as small as possible. For this reason, it is advisable
to design the heat source and heating system very carefully. A
temperature difference of approx. one Kelvin (one °C) in-
creases the power consumption by around 2.5 %. When de-
signing the heating system, it should be borne in mind that spe-
cial consumers such as e.g. domestic hot water preparation
should also be taken into consideration and dimensioned for
low temperatures. Underfloor heating systems (panel heating)
are optimally suited for heat pump use on account of the low
flow temperatures (30 °C to 40 °C).
It is important to ensure that the heat exchangers are not con-
taminated during operation because this increases the temper-
ature difference, in turn reducing the COP.
Correct adjustment of the heat pump manager is also impor-
tant for energy-efficient use of the heat pump. Further informa-
tion can be found in the operating instructions of the heat
pump manager.

www.dimplex.de 452167.66.48-EN · FD 0305 EN-3
LA 3860 English
2 Purpose of the heat pump
2.1 Application
The air-to-water heat pump is to be used exclusively for the
heating and cooling of heating water. It can be used in new or
existing heating systems.
The circulating pump(s) must be controlled using the heat
pump manager.
If function-relevant or safety-relevant pump functions, such as
integration of the heat pump into the building management
system, are not supported, then this can result in loss of war-
ranty and cause a write-off of the heat pump.
The circulating pump(s) and the heat pump controller must al-
ways be ready for operation.
The specifications in the technical documents must be fol-
lowed, particularly limit values for the minimum and – if availa-
ble – maximum warm/cold water volume flow.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -22 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 22 °C dur-
ing continuous operation.
The heat pump is not designed for the increased heat con-
sumption required when a building is being dried out. For this
reason, the additional heat consumption should be met using
special devices provided by the customer. For drying out build-
ings in autumn or winter, we recommend installing a suitable
2nd heat generator (e.g. electric heating element available as an
accessory).
NOTE
º
ºººº
The device is not suitable for operation with a frequency
converter.
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. it ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is brought to a higher temperature level by increasing
its pressure with the aid of the electrically driven compressor. It
is then transferred to the heating water via the liquefier (heat
exchanger).
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. As the energy extracted from
the air is transferred to the heating water, this type of device is
called an air-to-water heat pump.
The air-to-water heat pump consists of the main components:
evaporator, ventilator and expansion valve, as well as the low-
noise compressors, the liquefier and the electrical control sys-
tem.
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. Steam may be emitted from the air outlet de-
pending on the atmospheric conditions.

EN-4 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
3 Scope of supply
3.1 Basic device
The heat pump contains the components listed below.
The refrigeration circuit is "hermetically sealed" and contains
the fluorinated refrigerant R407C included in the Kyoto proto-
col. Information on the GWP value and CO2equivalent of the
refrigerant can be found in the chapter Device information. The
refrigerant is CFC-free, non-ozone depleting and non-combus-
tible.
1) Evaporator
2) Liquefier
3) Fan
4) Switch box
5) Compressor 1
6) Compressor 2
7) Filter dryer
8) Expansion valve
9) Inner heat exchanger
10) Collector
11) Dirt trap
3.2 Switch box
The switch box is located in the heat pump. It can be swung out
after removing the lower front cover and loosening the fasten-
ing screw located in the upper left-hand corner.
The switch box contains the supply connection terminals as
well the power contactors and the soft starter unit.
3.3 Heat pump manager
Use the heat pump manager included in the scope of supply to
operate the air-to-water heat pump.
The heat pump manager is a convenient electronic regulation
and control device. It controls and monitors the entire heating
system based on the external temperature, as well as domestic
hot water preparation and safety systems.
The customer must install the external temperature sensor,
which is included in the scope of supply of the unit heat pump
and heat pump manager together with the necessary fixing ac-
cessories.
The enclosed operating instructions describe the function and
use of the heat pump manager.
29
1
3
45
6
7
8
10
10
11
11

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LA 3860 English
4Transport
CAUTION!
!!
When transporting the heat pump, ensure that it is not tilted
more than 45° (in any direction).
Transport to the final installation location should be carried out
with a pallet. The basic device can be transported with a lift
truck or a crane.
The transport eyebolts must be removed after crane transport,
and the openings must be closed using the vent plugs supplied.
After transportation, the transport fastening in the device is to
be removed from both sides of the base.
CAUTION!
!
!
Before start-up, the transport fastening must be removed.
5 Installation
5.1 General
The device must be installed on a permanently level, smooth
and horizontal surface. The frame around the device must lie
tightly against the floor to guarantee adequate sound insula-
tion, to prevent water-bearing parts from cooling out and to
protect the inside of the device from small animals. If this is not
the case, additional insulation measures may be necessary. To
prevent small animals from entering the inside of the device, it
may be necessary to seal the connection hole in the base plate,
for example. Furthermore, the heat pump should be set up so
that the air outlet direction of the ventilator is perpendicular to
the main wind direction to allow unrestricted defrosting of the
evaporator. The heat pump is designed for installation on even
ground. If the installation conditions differ (installation on a
platform or flat roof) or there is a greater risk of the heat pump
tipping over (due to an exposed position or high wind expo-
sure), additional protection against tipping over must be pro-
vided. The responsibility for the
heat pump installation lies with the specialist system construc-
tion company. During the installation, local requirements such
as building regulations, static load of the building, and wind ex-
posure must be accounted for.
It must be possible to carry out maintenance work without hin-
drance. This is ensured when observing the distances to solid
walls as shown in the figure.
The specified dimensions are valid for stand-alone installation
only.
NOTE
ººººº
The heat pump is not intended for use above 2000 metres
(mean sea level).
CAUTION!
!
!
Do not restrict or block the area around the air intake or outlet.
CAUTION!
!!
Observe country-specific building regulations!
Remove/screw in
transport lock (4x)
1,0 m 2 m
≥
0m
0,8m

EN-6 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
CAUTION!
!
!
For installation close to walls the physical influences of the
building must be considered. No windows or doors should be
present in the area surrounding the air outlet of the ventilator.
CAUTION!
!
!
In cases of installation close to a wall, there may be more
sediment in the air inlet and outlet areas due to the air current.
The colder outside air outlet should discharge in such a way as
to not increase the heat losses in heated neighbouring rooms.
CAUTION!
!
!
Installation in a hollow or in an inner courtyard is not
permitted because cooled air collects at ground level and is
drawn in again by the heat pump during lengthy operation.
5.2 Condensate pipe
Condensate that forms during operation must be drained off
frost-free. To ensure proper drainage, the heat pump must be
mounted horizontally. The condensate pipe must have a mini-
mum diameter of 50 mm and must be fed into a sewer in such
a way that it is safe from frost. Do not discharge the condensate
directly into clearing tanks or cesspits, as aggressive vapours or
a condensed water pipe which has not been laid in a frost-free
manner could destroy the evaporator.
CAUTION!
!!
The frost line can vary according to the climatic region. The
regulations of the countries in question must be observed.
6 Assembly
6.1 General
The following connections need to be established on the heat
pump:
Heating system flows and returns
Condensate outflow
Control line to the heat pump manager
Voltage supply
6.2 Connection on heating side
The heating system connections on the heat pump are to be
made inside the device. Refer to the device information for the
connection sizes. Route the connection hoses out of the device
in a downwards direction. An optional pipe kit is available as an
accessory, which can be used to lead the connections out to
the side.
Use a spanner to firmly grip the transitions when connecting
the heat pump.
Before connecting the heating water system to the heat pump,
the heating system must be flushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the
liquefier could cause the heat pump to completely break down.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, de-aerated and pressure-tested.
NOTE
ººººº
Pump units with check valves maintain the specified flow
directions. If there is incorrect distribution or breaking off of
the volume flow, these units (and the check valves in
particular) must be checked! The use of check valves are
mandatory in the event of several heating circuits or parallel
connections for heat pumps in order to avoid incorrect
distribution.
6.3 Water Quality in Heating
Systems
6.3.1 Scale Formation
Scale formation in heating systems cannot be avoided, but in
systems with flow temperatures below 60 °C the problem is so
small that it is negligible. With high-temperature heat pumps
and in particular with bivalent systems in the higher perfor-
mance range (heat pump + boiler combination), flow tempera-
tures of 60 °C and more can be achieved. One preferred
method for preventing scale formation is softening because
this permanently removes alkaline earths (calcium and magne-
sium ions) from the heating system.
The following values for water quality in heating water and cold
water must be observed and checked during an on-site check:
Degree of hardness
Conductivity
pH value
Filterable materials
The following (limit) values must absolutely be observed:
Maximum degree of hardness in filling water and supple-
mentary water 11 dGH.
The conductivity in demineralised water (DM water) (low-
salt) may not be greater than 100 μS/cm.
The conductivity in partially demineralised water (saline)
may not be greater than 500 μS/cm.
The pH value must be between 8.2 and 9.
The limit value for filterable materials in heating water is <
30 mg/l
Frost line
Condensate drain
Flow and return
Electric cables
Heat pump
0,20 m
Control and main cables

www.dimplex.de 452167.66.48-EN · FD 0305 EN-7
LA 3860 English
If necessary, for example in bivalent systems, the specifications
listed in the table below must also be observed, or the precise
guidelines for filling water and supplementary water and the
total hardness must be taken from the table in accordance with
VDI 2035 – Sheet 1.
NOTE
º
ºººº
The specific volumes of a heating system must be determined
before filling the system.
The saturation index SI is used to determine whether water has
a tendency towards lime dissolution or lime separation. This
shows whether the pH value corresponds to a neutral pH point
or by how much it undershoots it due to excess acid or by how
much it exceeds it due to carbonic acid deficit. At a saturation
index below 0, the water is aggressive and will tend towards
corrosion. At a saturation index above 0, the water is calcare-
ous.
The saturation index SI should be between - 0.2 < 0 < 0.2
Fig. 6.1:Guideline values for filling and supplementary in accordance with
VDI 2035
CAUTION!
!
!
When using demineralised water, ensure that the minimum
permissible pH value of 8.2 is not undershot. Failure to comply
with this value can result in the heat pump being destroyed.
6.3.2 Corrosion
The VDI 2035 recommends the use of partially demineralised
water or demineralised water in systems with larger-than-aver-
age specific system volumes of 50 l/kW.
These measures (e.g. pH stabilizers) are implemented to set the
pH value of the heating water to minimise the risk of corrosion
in the heat pump and in the heating system.
Irrespective of the legal requirements, the following limit values
in the heating water used for various substances must not be
undershot or exceeded. This is to ensure safe operation of the
heat pump. A water analysis must be carried out before com-
missioning the system. If the water analysis produces a "-" for a
maximum of one indicator or a "o" for a maximum of two indica-
tors, the analysis must be classed as negative.
Filling and supplementary water as well as heating water, depending on
heat output
Overall heat output in kW
Total alkaline earths in mol/m³
(Total hardness in dGH)
 20 20 to 50 50
Specific system volume in l/kW
Heat output 1
1. For the purpose of calculating the specific system volume, the smallest indi-
vidual heat output is to be used for systems with several heat generators.
50
specific water content
heat generator > 0.3 k per kW 2
2. In systems with several heat generators with different specific water con-
tents, the smallest specific water content is decisive.
none 3.0 (16.8)
< 0.05 (0.3)
50
specific water content
heat generator > 0.3 k per kW 2
(e.g. circulating water heaters)
and systems with electric heat-
ing elements
3.0 (16.8) 1.5 (8.4)
> 50 kW to 200 kW 2.0 (11.2) 1.0 (5.6)
> 200 kW to 600 kW 1.5 (8.4)
< 0.05 (0.3)
> 600 kW < 0.05 (0.3)
Heating water, depending on heating output
Operating mode Electrical conductivity in µS/cm
Low-salt 3
3. Full softening is recommended for systems with aluminium alloys.
> 10 to 100
Containing salt > 100 to 1500
Appearance
clear, free from sedimentary substances
Evaluation characteristic
Concentration
range
(mg/l or ppm)
Stain-
less steel Copper
Bicarbonate (HCO3-)< 70 + o
70 - 300 + +
> 300 + o
Sulphate (SO42-)< 70 + +
70 - 300 o o/-
> 300 - -
Hydrogencarbonate/sulphate
HCO3-/SO42-
> 1.0 + +
< 1.0 o -
Electrical conductivity 1< 10 µS/cm o o
10 - 500 µS/cm + +
> 500 µS/cm o o
pH value 2< 6.0 - -
6.0 - 8.2 o o
8.2 - 9.0 + +
> 9.0 o o
Ammonium (NH4+)< 2 + +
2 - 20 o o
> 20 - -
Chloride ions (Cl-)< 50 + +
50 - 150 o o
> 150 - -
Free chlorine (Cl2)< 0.5 + +
0.5 - 5 - o
> 5 - -
Hydrogen sulphide (H2S) < 0.05 + +
> 0.05 + o/-
Carbon dioxide (CO2)< 5 + +
5 - 10 + o
> 10 o -
Nitrate (NO3-)< 100 + +
> 100 o o
Iron (Fe) < 0.2 + +
> 0.2 o o
Aluminium (Al) < 0.2 + +
> 0.2 + o
Manganese (Mn) < 0.05 + +
> 0.05 o o

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English LA 3860
Fig. 6.2:Limit values for the quality of heating water
Resistance of copper-soldered or welded stainless-steel plate
heat exchangers to the substances present in water:
Notes
"+" = Normally good resistance
"o" = Corrosion problems may arise,particularly if several
factors receive an evaluation of "o"
"-" = Should not be used
NOTE
º
ºººº
The water quality should be checked again after 4 to 6 weeks,
as the quality could change during the first few weeks of
operation due to chemical reactions.
NOTE
º
ºººº
It is mandatory to use hydraulically closed systems. It is not
permissible to use any open hydraulic systems!
Note:
The hot water connections must be established according to
the dimensional drawing (see Cap. 13.1 on page 16) in the
countercurrent principle.
Important:
The notes/settings in the instructions of the heat pump man-
ager must always be observed and carried out accordingly; not
doing so will lead to malfunctions.
Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating system.
This can be accomplished, for example, by installing either a
dual differential pressureless manifold or an overflow valve. The
procedure for setting an overflow valve is described in the
chapter "Commissioning". When the minimum heating water
flow rate is undershot, the plate heat exchanger in the refriger-
ation 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.
The specified “Minimum heating water flow rate for pump siz-
ing” (See “Device information” on page 13.) must be ensured
during defrosting and cooling operation. An installed flow rate
switch 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.
Antifreeze
Heat pump systems, which cannot be guaranteed to be frost-
free, should be equipped with a drainage option (see Fig.). The
antifreeze function of the heat pump manager is active when-
ever the heat pump manager and the heat circulating pump are
ready for operation. When decommissioning the heat pump, or
in the event of a power failure, the system must be drained
through the indicated points (see illustration); it may be neces-
sary to purge the system with compressed air. The heating cir-
cuit should be operated with a suitable antifreeze if heat pump
systems are implemented in buildings where a power failure
cannot be detected (holiday home).
Saturation Index < -0.2 o o
-0.2 - 0.1 + +
0.1 - 0.2 + o
> 0.2 o o
Filterable materials < 30 + +
> 30 - -
Total hardness < 6 °dGH o/+ o/+
6 - 11 °dGH + +
> 11 °dGH - -
Oxygen (O2)< 0.02 + +
< 0.1 +/o +/o
> 0.1 - -
Nitrite (NO2-)< 0.1 + +
> 0.1 - -
Sulphide (S2-)< 1.0 + +
> 1.0 - -
1. If the limit values in the VDI 2035 are more restrictive, these apply accord-
ingly.
2. When using demineralised water, ensure that the minimum permissible pH
value of 8.2 is not undershot. Failure to comply with this value can result in
the heat pump being destroyed.
2
1
3

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LA 3860 English
6.4 Electrical connection
3 lines/cables must be routed to the heat pump in total:
A standard 5-core cable is used to connect the heat pump
to the power supply.
The cable must be provided on-site. The conductor cross
section is selected in accordance with the power con-
sumption of the heat pump (see attachment Device Infor-
mation) and the applicable VDE (EN) and VNB regulations.
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 heat pump power supply. A 3-
pole circuit breaker with joint tripping of all outer conduc-
tors (trip current in accordance with device information)
provides the short circuit protection taking into account
the layout of the internal wiring.
The relevant components in the heat pump contain an in-
ternal overload protection.
When connecting, ensure that the incoming supply has a
clockwise rotating field.
Phase sequence: L1, L2, L3.
CAUTION!
!
!
Ensure that there is a clockwise rotating field: With incorrect
wiring the starting of the heat pump is prevented. A
corresponding warning is indicated on the display of the heat
pump manager (adjust wiring).
The control voltage is supplied via the heat pump manager.
A 3-pole line must be laid for this in accordance with the
electrical documentation. Further information on the wir-
ing of the heat pump manager is available in the heat pump
manager operating instructions.
A shielded communication line (J-Y(ST)Y ..LG) (not in-
cluded in the scope of supply) connects the heat pump
manager with the refrigeration circuit control installed in
the heat pump. More detailed instructions can be found in
the heat pump manager operating instructions and in the
electrical documentation.
NOTE
º
ºººº
The communication cable is necessary for the function of
airto- water heat pumps in outdoor installation. It must be
shielded and laid separately from the mains cable.
6.4.1 Demand sensor connection
The demand sensor R2.2 (NTC 10) is included with the heat
pump manager. It must be installed depending on the hydrau-
lics used.
If a demand sensor is not connected, the second heat genera-
tor can not be controlled with the heat pump manager in the
event of an interruption in communication either.
NOTE
º
ºººº
The return sensor R2 installed in the heat pump is active when
the compressor is running and must not be disconnected.
NOTE
º
ºººº
Sensor cables can be extended up to 50 m with 2 x 0.75 mm
cables.
6.4.2 Circulating pump connection with
high performance
In many cases, the supply voltage of the pump is stuck on con-
tinuous current when using larger electronically controlled cir-
culating pumps (the manufacturer’s information on the pump
being used should be taken into consideration). The pump is
then generally actuated using the Start/Stop input. This input is
operated with extra low voltage from the pump (a link cable is
usually inserted in the factory default of the pump). In order to
be able to actuate the input, a coupling relay with a floating
contact is required. This must be controlled with the pump
function of a 230 V relay output of the controller. Due to the
extra low voltage to be switched, a suitable relay with the ap-
propriate contact material (gilded) must be selected and inte-
grated on-site.
6.4.3 Frost protection
Regardless of the settings for the heat circulating pumps, they
always run in heating, defrost and frost protection mode. In sys-
tems with multiple heating circuits, the 2nd and 3rd heat circu-
lating pump has the same function.
CAUTION!
!
!
To ensure that the frost protection function on the heat pump
works properly, the heat pump manager must remain
connected to the power supply and flow must be maintained
through the heat pump at all times.
CAUTION!
!
!
The primary pump (M11 – responsible for the heat source flow
rate) and the secondary pump (M16 – responsible for the
warm/cold water flow rate) must always be clamped to the
heat pump manager in all cases. This is the only way to ensure
the pump flows and returns necessary for operation and to
ensure that the necessary safety measures are in place.

EN-10 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
7Start-up
7.1 General
To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorised by
the manufacturer. These measures can also include an addi-
tional warranty under certain conditions (see Warranty).
7.2 Preparation
The following items need to be checked prior to start-up:
All of the heat pump connections must be installed as de-
scribed in chapter 6.
All valves that could impair the proper flow of the heating
water in the heating circuit must be open.
The air intake and air outlet paths must be clear.
The fan must turn in the direction indicated by the arrow.
The settings of the heat pump manager must be adapted
to the heating system in accordance with the manager’s
operating instructions.
Ensure the condensate outflow functions properly.
The hydraulic network must be flushed correctly before in-
stalling the heat pump. This includes the supply line to the
heat pump. Only when flushing is complete can the heat
pump be hydraulically integrated.
The dirt traps present as standard or included for assembly
must be inspected between 4 and 8 weeks after the heat
pump is commissioned or changes made to the heating
system and cleaned if necessary. Further maintenance in-
tervals must be scheduled depending on the level of soil-
ing, which must be defined and carried out by a suitably
qualified person.
Special notes for the integration of heat pumps in
existing systems (renovations):
The existing heat distribution network (pipe materials, connec-
tion types, etc.) and the existing heating systems (e.g. radiators,
underfloor heating, etc.) can impact the quality of the water in
existing systems. Particularly when welded steel pipes or pipes
that are not oxygen diffusion-proof are used, deposits, scaling,
silting or similar may be present that can cause damage in the
heat pump system. This can result in a total failure of the heat
pump The following measures must be observed to avoid this:
Compliance with the water properties and water quality
Flushing of the hydraulic system
Maintenance interval of the dirt traps
If silting or ferromagnetic particles are to be expected in
the hydraulic network, dirt separators or magnetite separa-
tors must be installed on-site before the medium enters
the heat pump. The maintenance intervals must be defined
by a suitably qualified person.
7.3 Procedure
The heat pump is started up via the heat pump manager. Ad-
justments should be made in compliance with the instructions.
At hot water temperatures under 7 °C, start-up is not possible.
The water in the buffer tank must be heated to a minimum of
22 °C with the second heat generator.
To ensure a problem-free start-up, the following procedure is to
be implemented:
1) Close all consumer circuits.
2) Ensure that the heat pump has the correct water flow.
3) Select "Winter" mode on the heat pump manager.
4) In the special functions menu, start the "Start-up" program.
5) Wait until a return temperature of at least 29 °C has been
reached.
6) Now slowly reopen the heating circuit valves in succession
so that the heating water flow is constantly raised by
slightly opening the respective heating circuit. The heating
water temperature in the buffer tank must not be allowed
to drop below 24 °C during this process. This ensures that
the heat pump can be defrosted at any time.
7) When all heat circuits are fully open and a return tempera-
ture of at least 22 °C is maintained, the heat pump start-up
is complete.
CAUTION!
!
!
Operating the heat pump at low system temperatures may
cause the heat pump to break down completely.

www.dimplex.de 452167.66.48-EN · FD 0305 EN-11
LA 3860 English
8 Cleaning / maintenance
8.1 Maintenance
To protect the paintwork, avoid leaning anything against the
device or putting objects on the device. External heat pump
parts can be wiped with a damp cloth and domestic cleaner.
NOTE
º
ºººº
Never use cleaning agents containing sand, soda, acid or
chloride as these can damage the surfaces.
To prevent faults due to sediment in the heat exchanger of the
heat pump, ensure that the heat exchanger in the heating sys-
tem cannot be contaminated. In the event that operating mal-
functions due to contamination still occur, the system should
be cleaned as described below.
8.2 Cleaning the heating system
CAUTION!
!
!
The installed dirt traps must be cleaned at regular intervals.
The maintenance intervals should be defined according to the
degree of soiling in the system. The filter insert should also be
cleaned.
For cleaning, the heating circuit must be made pressureless in
the vicinity of the dirt trap, the filter compartment unscrewed,
and the filter insert removed and cleaned. Assembly carried out
in reverse order requires attention to correct assembly of the
screen inserts and tightness of the screw joints.
The ingress of oxygen into the heating water circuit may result
in the formation of oxidation products (rust), particularly if steel
components are used. They enter the heating system via the
valves, the circulating pumps and/or plastic pipes. It is there-
fore essential - in particular with respect to the entire pipework
- that only diffusion-resistant materials are used.
NOTE
º
ºººº
We recommend the installation of a suitable corrosion
protection system to prevent the formation of deposits (e.g.
rust) in the condenser of the heat pump. We recommend
equipping diffusion-open heating systems with an
electrophysical anti-corrosion system (e.g. ELYSATOR
system).
Residue from lubricants and sealants may also contaminate the
heating water.
In the case of severe contamination leading to a reduction in
the performance of the liquefier in the heat pump, the system
must be cleaned by a heating technician.
Based on current knowledge, we recommend carrying out the
cleaning with a 5 % phosphor acid or, if more frequent cleaning
is required, with a 5 % formic acid.
In either case, the cleaning fluid should be at room tempera-
ture. We recommend flushing the heat exchanger in the direc-
tion opposite to the normal flow direction.
To prevent acidic cleaning agents from entering the heating
system circuit, we recommend connecting the flushing device
directly to the flow and return of the liquefier of the heat pump.
It is then important that the system be thoroughly flushed using
appropriate neutralising agents to prevent any damage from
being caused by cleaning agent residue remaining in the sys-
tem.
Acids must be used with care and the regulations of the em-
ployers’ liability insurance associations must be adhered to.
The manufacturer's instructions regarding cleaning agent must
be complied with at all times.

EN-12 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
8.3 Cleaning the air system
The evaporator, ventilator and condensate outflow should be
cleaned of contamination (leaves, twigs, etc.) before each new
heating period.
CAUTION!
!
!
Before opening the device, ensure that all circuits are
powered down.
To prevent the evaporator and the condensate tray from being
damaged, do not use hard or sharp objects when cleaning.
Under extreme weather conditions (e.g. snow drifts), ice may
form on the air intake and air outlet grids. If this happens, the ice
must be removed in the vicinity of the air intake and air outlet
grids to ensure that the minimum air flow is maintained.
To ensure proper drainage from the condensate tray, it must be
regularly inspected and cleaned, if necessary.
All panelling can be removed to allow accessing the inside of
the device.
The two sash fasteners must be opened for this purpose. The
cover must then be slightly tilted forward and lifted off toward
the top.
The upper panels are hooked into the cover panel. Loosen the
two screws for dismantling and unhook the panels by pulling
them back.
9 Faults / troubleshooting
This heat pump is a quality product and is designed for trouble-
free operation. In the event that a fault should occur, it will be
indicated on the heat pump manager display. Simply consult
the Faults and Trouble-shooting page in the operating instruc-
tions of
the heat pump manager. If you cannot correct the fault your-
self, please contact your aftersales service technician.
CAUTION!
!
!
Before opening the device, ensure that all circuits are
disconnected from the power supply!
After disconnecting the power supply, always wait for at least 5
minutes to allow stored electric charges to dissipate.
CAUTION!
!
!
Any work on the heat pump may only be performed by
authorised and qualified after-sales service technicians.
10 Decommissioning / disposal
Before removing the heat pump, disconnect it from the power
source and close all valves. The deinstallation of the heat pump
must be performed by technical personnel. Observe all environ-
mentally-relevant requirements regarding the recovery, recy-
cling and disposal of materials and components in accordance
with all applicable standards. Particular attention should be
paid to the proper disposal of refrigerants and refrigerant oils.
Opening the lower covers Closing the lower covers
Opening the upper cover panels Closing the upper cover panels
3.
1.
1.
2.
2.
1.
3.
3.
2.
2.
2.
1.
1.
3.
3.
2.
2.
3.
3.
1.
1.
2.

www.dimplex.de 452167.66.48-EN · FD 0305 EN-13
LA 3860 English
11 Device information
1 Type and order code LA 3860
2 Design
Heat source Air
2.1 Version Universal
2.2 Controller WPM wall-mounted
2.3 Thermal energy metering Integrated
2.4 Installation location Outside
2.5 Performance level 2
3 Operating limits
3.1 Heating water flow / return 1°C to 60 -2(to 62 -2) 2/ from 22
Air (heating) °C -22 to +40
4Flow/sound
4.1 Heating water flow rate / internal pressure differential
Minimum heating water flow rate for pump sizing
A7/W35/30 m³/h / Pa 6.0 / 180003
A7/W45/40 m³/h / Pa 5.8 / 16800
A7/W55/47 m³/h / Pa 3.4 / 9400
5 Sound power level according to EN 12102
Normal operation / reduced operation 4dB(A) 78 / ---
5.1 Sound pressure level at a distance of 10 m (air outlet side)5
Normal operation / reduced operation 4dB(A) 46 / ---
5.2 Air flow (controlling range EC fan) m³/h 0 - 25000
6 Dimensions, weight and filling quantities
6.1 Device dimensions without connections6H x W x L mm 2300 x 1900 x 1000
6.2 Weight of the transportable unit(s) incl. packaging kg 870
6.3 Device connections for heating Inches Rp 2”
6.4 Refrigerant / total filling weight Type / kg R407C / 15.7
6.5 GWP value / CO2equivalent --- / t 1774 / 27
6.6 Refrigeration circuit hermetically sealed yes
6.7 Lubricant / total filling quantity Type / litres POE (RL32-3MAF) / 8.0
6.8 Volume of heating (cooling) water in device Litres 10.4
7 Electrical connection
7.1 Supply voltage / fusing / RCD type 3~/PE 400 V (50 Hz) / C50A / B
7.2 Control voltage / fusing for WPM 1~/N/PE 230 V (50 Hz) / 6.3 AT
7.3 Degree of protection according to EN 60 529 IP24
7.4 Starting current limiter Soft starter
7.5 Rotary field monitoring Yes
7.6 Starting current A 60
7.7 Nominal power consumption A7/W35 / max. consumption 7kW 7.8 / 26.4
7.8 Nominal current with A7/W35 / cos  A / --- 14.2 / 0.80
7.9 Power consumption of compressor protection
(per compressor) W 120
7.10 Power consumption of fan kW up to 5.0
8 Complies with the European safety regulations See CE declaration of conformity

EN-14 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
9 Additional model features
9.1 Type of defrosting (according to need) Reverse circulation
9.2 Condensate tray frost protection / Water in device
protected against freezing 8Heated / Yes
9.3 max. operating overpressure (heat source / heat sink) bar 3.0
10 Performance / coefficient of performance (COP)
10.1 SCOP (Seasonal coefficient of performance) average climate 35 °C / 55 °C 3,91 / 3.33
10.2 ŋsaverage climate 35 °C / 55 °C 154 / 130
10.3 Heat output / coefficient of performance (COP) 7Heat source / heat sink EN 14511
Air / water Performance level 12 9
with A-15 / W35 kW / --- 16.9 / 2.6 31.7 / 2.6
with A-7 / W35 kW / --- 22.2 / 3.2 38.0 / 3.0
with A2 / W35 kW / --- 26.6 / 3.6 43.4 / 3.4
with A7 / W35-30 kW / --- 35.3 / 4.5
with A12 / W35 kW / --- 38.1 / 4.8
with A7 / W45-40 kW / --- 32.9 / 3.7
with A7 / W55-47 kW / --- 31.7 / 3.2
1. For air temperatures between -22 °C and 0 °C, flow temperature increasing from 45 °C to 60 °C.
2. The specified maximum heating water flow temperature applies to the heating water flow for A7 / W55-47.
3. The specified “Minimum heating water flow rate for pump sizing” must be ensured for trouble-free operation in the pump flow and during defrosting.
Electronic control of the M16 heat generation circuit pump via the WPM enables a reduction of the volume flow in heating operation.
4. The heat output and COP is reduced by approx. 5% in lower operation
5. The specified sound pressure level corresponds to the operating noise of the heat pump in heating operation with a flow temperature of 55 °C.
The specified sound pressure level represents the free sound area level. The measured value can deviate by up to 16 dB(A) depending on the installation location.
6. Note that additional space is required for pipe connections, operation and maintenance
7. This data indicates the size and capacity of the system. For an analysis of the economic and energy efficiency of the system, the bivalence point and
the regulation should be taken into consideration. These figures are only achieved with clean heat exchangers. Instructions for maintenance, commissioning and operation can
be found in the relevant sections of the assembly and operating instructions. The specified values have the following meaning, e.g. A 7 / W35: heat source temperature 7 °C and
heating water flow temperature 35 °C.
8. The heat circulating pump and the heat pump manager must always be ready for operation.
9. For special applications with increased heat consumption at high outside temperatures, please contact our project planning department.

www.dimplex.de 452167.66.48-EN · FD 0305 EN-15
LA 3860 English
12 Product information as per
Regulation (EU) No 813/
2013, Annex II, Table 2
Information requirements for heat pump space heaters and heat pump combination heaters
Item Symbol Value Unit Item Symbol Value
Unit
Tj = - 7°C
Pdh 39,0 kW Tj = - 7°C COPd2,41 -
Tj = + 2°C
Pdh 26,4 kW Tj = + 2°C COPd3,30 -
Tj = + 7°C
Pdh 33,8 kW Tj = + 7°C COPd4,19 -
Tj = + 12°C
Pdh 39,7 kW Tj = + 12°C COPd4,76 -
Tj = bivalent temperature
Pdh 36,0 kW Tj = bivalent temperature COPd2,22 -
Tj = operation limit temperature
Pdh 36,0 kW Tj = operation limit temperature COPd2,22 -
For air-to-water heat pumps
For air-to-water heat pumps:
Tj = -15°C (if TOL < -20°C)
Pdh 0,0 kW Tj = -15°C (if TOL < -20°C) COPd0,00 -
Bivalent temperature
Tbiv -10 °C
For air-to-water heat pumps:
Operation limit temperature
TOL -10 °C
Cycling interval capacity for heating
Pcych -kW Cycling interval efficiency COPcyc --
Degradation co-efficient (**)
Cdh 0,90 -
Heating water operating limit
temperature
WTOL 60 °C
Power consumption in modes other than active mode
Supplementary heater
Off mode
POFF 0,030 kW Rated heat output (*) Psup 0kW
Thermostat-off mode
PTO 0,029 kW Type of energy input eletrical
Standby mode
PSB 0,030 kW
Crankcase heater mode PCK 0,095 kW
Other items
Capacity control
fixed - 14000
m³ /h
Sound power level, indoors/ outdoors
LWA - / 78 dB - --
m³ /h
Emissions of nitrogen oxides
NOx-mg/kWh
Declared load profile
-Water heating energy efficiency ηwh -%
Daily electricity consumption
Qelec - kWh Daily fuel consumption Qfuel -
kWh
Contact details
(**) If Cdh is not determined by measurement nthen the default degradation is Cdh = 0,9
(--) not applicable
For air-to-water heat pumps: Rated
air flow rate, outdoors
For water-/brine-to-water heat
pumps: Rated brine or water flow
rate, outdoor heat exchanger
Declared capacity for heating foer part load at indoor temperature 20°C and
outdoor temperature Tj
Declared coefficient of performance or primary energy ratio for part load at
indoor temperature 20 °C and outdoor temperature Tj
For heat pump combination heater:
Glen Dimplex Deutschland GmbH, Am Goldenen Feld 18, 95326 Kulmbach
(*) For heat pump space heaters and heat pump combination heaters, the rated output Prated is equal to the design load for heating Pdesignh , and the rated
heat output of a supplementary capacity for heating sup(Tj ).
130
%
Heat pump combination heater
no
Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps. For low- temperature heat pumps, parameters
shall be declared for low-temperature application.
Rated heat output (*)
Prated
35 kW
Seasonal space heating energy
efficiency
ηs
Parameters shall be declared for average climate conditions:
Brine-to-water heat pump
no
Low-temperature heat pump
no
Equipped with a supplementary heater
no
Model
LA 3860
Air-to-water heat pump
yes
Water-to-water heat pump
no

EN-16 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
13 Dimension Drawings
13.1 Dmension Drawing
A ( 1 : 5 )
682
1844
916302703302
950
1901
2300
1598 186
1322
901
0
102
187
299
389
0
60
85
4125
0,94m
0,58 m 0,58 m
1,84 m
0,8 m
1m
2m
0,08m
0,4m
0,4 m
0,46 m
1,048m
1,08m
1,46 m
1,64 m
1,84 m
0,15-0,3m
0,15-0,3m
Luftrichtung /
Direction of air flow /
Sens d'écoulement air
Luftrichtung /
Direction of air flow /
Sens d'écoulement air
Hauptwindrichtung bei freier Aufstellung
Main wind direction with free-standing installation / Direction des vents dominants en cas d’installation sur emplacement dégagé
Standfläche Wärmepumpe und Mindestabstände / Base area heating pump and minimum clearances / Surface de pose de pompe à chaleur et écartements minimau
Anschlussschema für
optionalen Rohrbausatz Connection diagram for optional pipe kit Schéma de raccordement pour kit de tuyaux optionnel
kein Mindestabstand erforderlich
No minimum clearance required
Aucun écartement minimum requis
umlaufend 0,03m all around sur la circonférence
1 Heizwasservorlauf
Ausgang aus Wärmepumpe
R 2
2 Heizwasserrücklauf
Eingang in Wärmepumpe
R 2
3 Durchführungsbereich
Elektroleitungen / Kondensat
4 Optionale Durchführung
Elektroleitungen
5 Optionale Durchführung
Kondensat
Frostschutz erforderlich
Heating water flow Output from heat pump R 2 Heating water return flow Input into the heat pump R 2 Feedthrough area Electrical lines / condensate Optional feedthrough Electric cables Optional feedthrough Condensate Frost protection required
Circuit aller d'eau de chauffage Sortie de la pompe à chaleur R 2 Circuit retour d'eau de chauffage Entrée dans la pompe à chaleur R 2 Zone de passage Conduites électriques / condensats Passage optionnel Conduites électriques Passage optionnel Condensats Protection antigel requise
A
ufstellfläche für Podest oder Streifenfundament
Installation area for platform or strip foundation Espace d’installation pour socle ou semelle filante-
Notwendige Aufstandsfläche Necessary footprint Surface d’installation requise Fixing points for P16 mm
Points de fixation P16 mm
A
ufstellungsvariante auf einer tragenden Unterkonstruktion
Installation version on a supporting substructure Variante d’installation sur une structure porteuse
Lufteintritt Air inlet Entrée d’air Luftaustritt
Air outlet Sortie d’air
2
1
A
0
78
185
398
940
0
32
94
211
400
1840
589
820
1000
3
2
1
944
1060

www.dimplex.de 452167.66.48-EN · FD 0305 EN-17
LA 3860 English
14 Diagrams
14.1 Characteristic curves for
heating operation
0
2
4
6
8
10
12
14
16
18
20
-25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40
45
Lufteintrittstemperatur in [°C]
Air inlet temperature in [°C]
Température d'entrée d'air en [°C]
Leistungsaufnahme in [kW] (incl. Pumpenleistungsanteil)
Power consumption in [kW] (incl. power input to pump)
Consommation de puissance en [kW] (y compris part de consommation de la pompe)
45
55
45
55
35
35
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
55000
012345678910
11
Heizwasserdurchfluss in [m³/h]
Heating water flow rate in [m³/h]
Débit d'eau de chauffage en [m³/h]
Druckverlust in [Pa]
Pressure loss in [Pa]
Perte de pression en [Pa]
Verflüssiger
Condenser
Condenseur
0
1
2
3
4
5
6
7
-25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40
45
Lufteintrittstemperatur in [°C]
Air inlet temperature in [°C]
Température d'entrée d'air en [°C]
35
Leistungszahl (incl. Pumpenleistungsanteil)
Coefficient of performance (incl. power input to pump
Coefficient de performance (y compris part de consommation de la pompe)
45
55
0
5
10
15
20
25
30
35
40
45
50
55
60
65
-25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40
45
Lufteintrittstemperatur in [°C] · Air inlet temperature in [°C] · Température d'entrée d'air en [°C]
35
EN 14511
A7 W35...30 6,0 m³/h
A7 W45...40 5,8 m³/h
A7 W55...47 3,4 m³/h
45
55
45
35
55
Heizleistung in [kW]
Heating capacity in [kW]
Puissance de chauffage en [kW]
Wasseraustrittstemperatur in [°C
]
Water outlet temperature in [°C
]
Température de sortie de l'eau en [°C
]
2-Verdichterbetrieb
2-compressor mode
Fonctionnement à 2 compresseurs
1-Verdichterbetrieb
1-compressor mode
Fonctionnement à 1 compresseur

EN-18 452167.66.48-EN · FD 0305 www.dimplex.de
English LA 3860
14.2 Operating limits diagram
heating
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40
45
[rutarepmetressawzieH° [erutarepmetretawgnitaeH/]C° [egaffuahcuae'derutarépmeT/]C°C]
Wärmequelleneintrittstemperatur [°C]
Heat source inlet temperature [°C]
Température d'entrée de la source de chaleur [°C]
6,0 m³/h
3,4 m³/h
Wasseraustritt (+0 / -2 K)
Water outlet (+0 / -2 K)
Sortie d'eau (+0 / -2 K)
Die maximalen Vorlauftemperaturen werden beim geforderten Mindestheizwasserdurchfluss
erreicht.
The maximum flow temperatures are achieved at the specified minimum heating water flow.
Les températures départ maximales sont atteintes en cas de débit minimum d'eau de chauffage donné.
*Wassereintritt
*Water inlet
*Entrée d'eau
*Bei Luft/Wasser-Wärmepumpen stellt die minimale Heizwassertemperatur die Mindest-Rücklauftemperatur dar
*For air-to-water heat pumps the minimum heating water temperature is the minimum return temperature
*Sur les pompes à chaleur air / eau, la température minimale d'eau de chauffage correspond à la température retour minimale