STIEBEL ELTRON WPL 23 User manual

WPL 13, WPL 18, WPL 23
WPL 13 S, WPL 16 S
Compact air/water heat pump
Installation instructions
The installation (water and electrical work) and commissioning, as well as the maintenance of
this equipment, must only be carried out by an authorised qualified contractor in accordance with
these instructions.
264757
Index
1 General 2
1.1 Equipment description 2
1.2 Function 2
1.3 Correct operation 2
1.4 Incorrect operation 2
1.5 Regulations and standards 2
1.6 Standard delivery and accessories 2
2 Specification 3
2.1 Specification WPL 13, 18 ,23 3
2.2 Performance diagrams WPL 13, 18 ,23 4
2.3 Specification WPL 13 S, 16 S 7
2.4 Performance diagrams WPL 13 S, 16 S 8
3 Installation, connection, sound emissions
and commissioning 10
3.1 Transport 10
3.2 Installation location 10
3.3 Noise emissions 10
3.4 Installing the base unit 11
3.5 Base unit assembly 11
3.6 Heating water connection 11
3.7 Circulation pump 12
3.8 Condensate drain 12
3.9 Buffer cylinder 14
3.10 Second heat source 14
3.11 Checking the fan 14
3.12 Casing components 15
3.13 Installing the air hoses 15
4 Electrical connection 16
5 Electrical connection WPL S (single
phase) with WPAB 23
6 Commissioning 24
7 Operation and control 24
8 Maintenance and cleaning 24
8.1 Maintenance 24
8.2 Cleaning 24
9 Fault remedies 25
Initial startup protocol 26
Environment and recycling 29
Guarantee 29
Information for the owner of the
heat pump heating system
Keep these operating instructions safely and
pass them on to any new user, should the
equipment change hands. Let your contractor
check their content in conjunction with re-
quired maintenance or repair work.
26_03_01_0181

2
1 General
These installation instructions are for contrac-
tors. The heat pump installation also requires
the operating instructions of the heat pump
manager WPM.
The heating system heat pumps and the WPM
represent one function unit. Consequently,
their instructions are matched to each other.
Subject to the relevant system, observe the
installation instructions of the components of
which the system comprises.
1.1 Equipment description
• Forfullyautomaticheatingofheatingwater
to a flow temperature of 60 °C.
• Suitableforunderoorheatingandradiator
heating systems; preferred are low tempe-
rature heating systems, as these achieve
higher performance factors.
• Extractsenergyfromtheambientair(out-
side)
even at outside temperatures as low as –20
°C.
• Comprisesallcomponentsrequiredforits
function and all safety equipment.
• Centralcontroloftheheatingsystemand
safety functions through the WPM heat
pump manager (required accessory, part no.
see section 1.6).
• Corrosion-protected,externalcasingmade
from hot-dipped galvanised sheet steel plus
stove enamelled finish.
• Compactdesign,thereforemodestspace
requirementsforinteriororexteriorinstal-
lations.
• Testsymbolofindependenttestbodies
(see type plate).
• Filledwithnon-combustiblesafetyrefrige-
rant R407C.
1.2 Function
Heatisextractedfromoutsideairwithtem-
peratures ranging from + 30 °C to –20 °C by
theheatexchangerontheairside(evapo-
rator). Heating water is heated in the heat
exchangeronthewaterside(condenser)to
owtemperaturelevelsbythisextractedheat
and added heat from the electrical power
used by the compressor. At air temperatures
belowapprox.+7°C,thehumidityintheair
condenses as hair-frost on the evaporator fins.
This hair-frost is automatically removed. Any
water created from this defrosting is caught
in the defrost basin and drained off via a hose
(Fig. 7 and 8).
!
The fan is switched OFF and the heat
pump circuit is reversed to enable
the defrost phase. The energy required for
defrosting is drawn from the buffer cylinder.
For that reason, operation without a buffer
cylinder is not permissible, otherwise unfa-
vourable conditions could lead to the heating
water freezing up.
The heat pump automatically reverts to heat-
ing mode at the end of the defrost phase.
1.3 Correct operation
Theheatpumpisdesignedforextractingen-
ergy from the air and for
utilising this energy in water-based
heating systems within the stated operating
temperature range.
1.4 Incorrect operation
The installation location must be prepared by
your contractor in line with section 3.2. Never
operate the heat pump in areas at risk from
explosionsoroutsidethestatedoperating
temperature range.
1.5 Regulations and standards
Observe the following regulations and stan-
dards during assembly and installation.
On the water side:
DIN EN 12828 Safety equipment for hot water
heating systems
DIN 1988: Technical rules for DHW installations
TRD721:Safetyequipmenttopreventexcess
pressure - safety valves
On the electrical side:
DIN VDE 0100: Regulations for the installation
of HV systems with rated voltages up to 1000 V.
VDE 0701: Regulations regarding the repair,
modification and testing of used electrical
equipment.
VDE 0298-4:
TAB: Technical connection conditions for con-
nections to the LV mains.
On the refrigerant side:
EN 378: Safety and environmental require-
ments
DIN 7003: (draft)
General:
Collation of technical requirements for boiler
rooms, e.g. boiler room guidelines or nation-
al/local Building Regulations, commercial and
fire as well as emission control regulations
and requirements.
TA Lärm: Technical instructions to protect
against noise emissions
Installation instructions for contractors
1.6 Standard delivery and accessories
Part no.
Standard delivery – external installation
–Base unit
–Accessories (comprising the casing). 07 44 13
Standard delivery – internal installation
– Base unit
– Accessories (comprising the casing) 07 44 12
Accessories – internal installation
Air hose with thermal insulation, 3 m 16 80 80
Air hose with thermal insulation, 4 m 16 80 81
Hose connection plate 00 34 78
Condensate pump PK 9 18 21 38
Accessories – external installation
Sound insulation accessories 18 53 25
Accessories – external and internal inst. (required)
Cylinder SBP 200 E 18 54 58
Cylinder SBP 400 E 22 08 24
Cylinder SBP 700 E 18 54 59
Cylinder SBP 700 E SOL 18 54 60
Heat pump manager with wall mounting enclosure, WPMW II 18 54 50
Heat pump manager as control panel mounted version, WPMS II 18 54 51
Special accessories – external and internal installation
Mixermoduleascontrolpanelmountedversion,MSMS 07 45 18
PressurehoseG1¼”x1m(DN32) 07 44 14
PressurehoseG1¼”x2m(DN32) 18 20 19
PressurehoseG1¼”x5m(DN32) 18 20 20
PressurehoseG1¼”x1m(DN32)fortrimming 18 56 47
Hose fittings for pressure hose G 1¼” (DN32) 07 06 92
Heat pump Compact Installation WPKI 5 22 08 30
UP kit 32 - 60 (for WPKI 5) 07 06 30
UP kit 32 - 80 (for WPKI 5) 07 06 31
Remote control for heating system FE 7 18 55 79
Contact sensor AVF 6 16 53 41
Immersion sensor TF 6 16 53 42

3
Heat pump Type WPL 13 WPL 18 WPL 23
Order no. 07 44 10 07 44 11 18 21 33
Type and operating mode
Type
Compact/split/open version
Compact Compact Compact
Operating mode mono-mode
alternative dual-mode
parallel dual-mode
mono-mode
alternative dual-mode
parallel dual-mode
mono-mode
alternative dual-mode
parallel dual-mode
Dimensions, weights, connection dimensions
Shipping unit - base equipment
Dimensions (L/W/H) mm 1182x784x1116 1182x784x1116 1182x784x1116
Weight kg 210 220 225
Refrigerant Type R 407C R 407C R 407C
Filling weight kg 4.0 4.0 4.0
Pipe connector – heating side
Flow and return
Inch G 1¼” male G 1¼” male G 1¼” male
Hose connector - air
Inletandexhaustconnectors(onlyforinternalinstallation)
mm 248x721oval 248x721oval 248x721oval
Output
Heat output kW 6.6 9.7 10,9
for A2/W352) kW 8.0 11.6 12,9
Power consumption kW 2.4 3.3 3,9
for A2/W352) kW 2.5 3.4 4.0
Performance factor 2.8 2.9 2,8
for A2/W352) 3.3 3.4 3.2
Powerconsumption–auxiliaryheater kW 8.8 8.8 8.8
Process medium
Volume flow, hot side WNA min4) m³/h 1.0 1.2 1.4
Internal pressure differential hPa 105 145 190
Volume flow, cold side WQA min3) m³/h 3500 3500 3500
Externallyavailablestaticpressuredifferential
(only for internal version)
hPa 1.0 1.0 1.0
Operating temperature limits
WQAmin./WQAmax3) °C – 20 / + 30 – 20 / + 30 – 20 / + 30
WNAmin./WNAmax4) °C + 15 / + 60 + 15 / + 60 + 15 / + 60
Electrical specification
Mains supply, Fuse A 16 gl 16 gl 16 gl
Secondary heater DHC (internal HS 2), Fuse A 16 gl 16 gl 16 gl
Control circuit, Fuse A 16 gl 16 gl 16 gl
Protection EN 60529 (DIN VDE 0470) IP 14 B IP 14 B IP 14 B
Voltage / Frequency - compressor V/Hz 3/PE~400/50 3/PE~400/50 3/PE~400/50
Voltage / Frequency – secondary heater DHC (internal HS 2) V/Hz 3/N/PE~400/50 3/N/PE~400/50 3/N/PE~400/50
Voltage / Frequency – control circuit V/Hz 1/N/PE~230/50 1/N/PE~230/50 1/N/PE~230/50
Start-up current (start-up current limit) A < 30 < 30 < 30
Defrost
Time/Demand/manual defrost Demand / manual Demand / manual Demand / manual
Type of defrost: Hot gas/electrical/air/flow reversal Flow reversal Flow reversal Flow reversal
Heating the drip pan yes, supercooler yes, supercooler yes, supercooler
Other model characteristics
Frost protection measures yes/no yes yes yes
Corrosion protection – frame and housing hot-dipped galvanised hot-dipped galvanised hot-dipped galvanised
In line with safety regulations DIN EN 60335 ; DIN 8975,
EMC Directive 89/336/EEC,
Low Voltage Directive 73/23/EEC
Sound power level dB(A) 65 65 65
(externalinstallationwithsilenceraccessories) dB(A) 63 63 63
(internalinstallation;internal/external) dB(A) 56/62 57/62 58/62
1) A–7/W35 = Air inlet temperature: –7 °C, heating flow: 35 °C
2) A2/W35 = Air inlet temperature: 2 °C, heating flow: 35 °C
2 Specification (check details on the rating plate)
2.1 Specification (equipment information)
3) WQA = Heat source system (cold side)
4) WNA = Heat utilisation system (hot side)

4
Fig. 1a
2.2 Output diagram for heat pump WPL 13
Flow temperature 35°C
Flow temperature 50°C
Flow temperature 60°C
Power consumption, heat output [kW]Performance factor
Inlet temperature of the WQA (= heat source system) medium [°C]
26_03_01_0180

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2.2 Output diagram for heat pump WPL 18
Fig. 1b
Flow temperature 35°C
Flow temperature 50°C
Flow temperature 60°C
Power consumption, heat output [kW]
Inlet temperature of the WQA (= heat source system) medium [°C]
Performance factor
26_03_01_0179

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26_03_01_01_0182
0
5
10
15
-20 -15 -10 -5 0 5 10 15 20 25 30
5
1
2
3
4
-20 -15 -10 -5 0 5 10 15 20 25 30
Leistungszahl [–] Leistungsaufnahme, Heizleistung [kW]
Eintrittstemperatur des WQA Mediums [°C]
25
20
Vorlauftemperatur 35°C
Vorlauftemperatur 50°C
Vorlauftemperatur 60°C
Fig. 1c
Flow temperature 35°C
Flow temperature 50°C
Flow temperature 60°C
Power consumption, heat output [kW]
Inlet temperature of the WQA (= heat source system) medium [°C]
Performance factor
2.2 Output diagram for heat pump WPL 23
26_03_01_01_0182

7
Heat pump Type WPL 13 S WPL 16 S
Order no. 22 70 28 22 20 29
Type and operating mode
Type
Compact/split/open version
Compact Compact
Operating mode mono-mode
alternative dual-mode
parallel dual-mode
mono-mode
alternative dual-mode
parallel dual-mode
Dimensions, weights, connection dimensions
Shipping unit - base equipment
Dimensions (L/W/H) mm 1182x784x1116 1182x784x1116
Weight kg 210 220
Refrigerant Type R 407C R 407C
Filling weight kg 4.0 4.0
Pipe connector – heating side
Flow and return
Inch G 1¼” male G 1¼” male
Hose connector - air
Inletandexhaustconnectors(onlyforinternalinstallation)
mm 248x721oval 248x721oval
Output
Heat output kW 6.8 8.0
for A2/W352) kW 8.7 9.8
Power consumption kW 2.4 2.8
for A2/W352) kW 2.6 2.8
Performance factor 2.8 2.9
for A2/W352) 3.4 3.5
Powerconsumption–auxiliaryheater kW 6.2 6.2
Process medium
Volume flow, hot side WNA min4) m³/h 1.0 1.2
Internal pressure differential hPa 105 145
Volume flow, cold side WQA min3) m³/h 3500 3500
Externallyavailablestaticpressuredifferential
(only for internal version)
hPa 1.0 1.0
Operating temperature limits
WQAmin./WQAmax3) °C – 15 (– 10) [0] / + 30
WNAmin./WNAmax4) °C + 15 / + 35 ( + 50) [+ 60]
Electrical specification
Mains supply, Fuse A 25 gl 25 gl
Secondary heater DHC (internal HS 2), Fuse A 35 gl 35 gl
Control circuit, Fuse A 16 gl 16 gl
Protection EN 60529 (DIN VDE 0470) IP 14 B IP 14 B
Voltage / Frequency - compressor V/Hz 1/N/PE~230/50 1/N/PE~230/50
Voltage / Frequency – secondary heater DHC (internal HS 2) V/Hz 1/N/PE~230/50 1/N/PE~230/50
Voltage / Frequency – control circuit V/Hz 1/N/PE~230/50 1/N/PE~230/50
Start-up current with WPAB / LAR / Ieff (start-up current limit) A < 45 / 97 / 48.9 < 45 / 108 / 54.3
Defrost
Time/Demand/manual defrost Demand / manual Demand / manual
Type of defrost: Hot gas/electrical/air/flow reversal Flow reversal Flow reversal
Heating the drip pan yes, supercooler yes, supercooler
Other model characteristics
Frost protection measures yes/no yes yes
Corrosion protection – frame and housing hot-dipped galvanised hot-dipped galvanised
In line with safety regulations DIN EN 60335 ; DIN 8975,
EMC Directive 89/336/EEC,
Low Voltage Directive 73/23/EEC
Sound power level dB(A) 65 65
(externalinstallationwithsilenceraccessories) dB(A) 63 63
(internalinstallation;internal/external) dB(A) 56/62 57/62
1) A–7/W35 = Air inlet temperature: –7 °C, heating flow: 35 °C
2) A2/W35 = Air inlet temperature: 2 °C, heating flow: 35 °C
3) WQA = Heat source system (cold side)
4) WNA = Heat utilisation system (hot side)
2.3 Specification (equipment information)

8
Abb. 1d
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1
2
3
4
5
6
7
-15 -10 -5 0 5 10 15 20 25 30
35°C Vorlauftemperatur
45°C Vorlauftemperatur
50°C Vorlauftemperatur
55°C Vorlauftemperatur
60°C Vorlauftemperatur
02.10.2007
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-15 -10 -5 0 5 10 15 20 25 30
35°C Vorlauftemperatur
45°C Vorlauftemperatur
50°C Vorlauftemperatur
55°C Vorlauftemperatur
60°C Vorlauftemperatur
Aussentemperatur J(A) / °C
Leistungsaufnahme P(el) / kW Heizleistung Q`(H) / kW
Leistungszahl e / –
Aussentemperatur J(A) / °C
C26_03_01_0873C26_03_01_0874
Flow temperature 35 °C
Flow temperature 45 °C
Flow temperature 50 °C
Flow temperature 55 °C
Flow temperature 60 °C
Power consumption, heat output [kW]
Inlet temperature of the WQA (= heat source system) medium [°C]
Performance factor
2.4 Output diagram for heat pump WPL 13 S
Inlet temperature of the WQA (= heat source system) medium [°C]
Flow temperature 35 °C
Flow temperature 45 °C
Flow temperature 50 °C
Flow temperature 55 °C
Flow temperature 60 °C

9
Abb. 1e
11.10.2007
0
1
2
3
4
5
6
7
-15 -10 -5 0 5 10 15 20 25 30
35°C Vorlauftemperatur
45°C Vorlauftemperatur
50°C Vorlauftemperatur
55°C Vorlauftemperatur
60°C Vorlauftemperatur
11.10.2007
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
-15 -10 -5 0 5 10 15 20 25 30
35°C Vorlauftemperatur
45°C Vorlauftemperatur
50°C Vorlauftemperatur
55°C Vorlauftemperatur
60°C Vorlauftemperatur
Aussentemperatur J(A) / °C
Leistungsaufnahme P(el) / kW Heizleistung Q`(H) / kW
Leistungszahl e / –
Aussentemperatur J(A) / °C
C26_03_01_0875C26_03_01_0876
2.4 Output diagram for heat pump WPL 16 S
Flow temperature 35 °C
Flow temperature 45 °C
Flow temperature 50 °C
Flow temperature 55 °C
Flow temperature 60 °C
Flow temperature 35 °C
Flow temperature 45 °C
Flow temperature 50 °C
Flow temperature 55 °C
Flow temperature 60 °C
Power consumption, heat output [kW]
Performance factor
Inlet temperature of the WQA (= heat source system) medium [°C]
Inlet temperature of the WQA (= heat source system) medium [°C]

10
26_03_01_0177
Fig. 3
Fig. 2
Dimensions in mm
Externalinstallation
Internal installation
3 Installation, connection and
sound emissions
3.1 Transport
Lifting slings for handling the base equipment
can be hooked up anywhere on the lower
frame.
Protect the heat pump against severe impact.
Short tipping to one of its longitudinal sides is
permissible.
Thecasing,cover(incaseofexternalinstalla-
tions) and the cover with air hose connections
(for internal installation) are separate shipping
units, which will only be assembled to the
base unit on site.
3.2 Installation location
Ensure that the surface on which the heat
pump is to be installed, is horizontal, level,
solid and permanent.
The entire heat pump frame should be in con-
tact with the substrate. Uneven substrates can
detrimentally affect the noise emissions from
the heat pump.
The heat pump must be accessible from all
sides.
3.2.1 Special considerations in case of external
installation
Recommended surface:
– Foundation (Fig. 4)
– Curb stones (Fig. 5)
– Stone plate
A recess (space) must be provided underneath
the heat pump to enable water and electrical
pipes/cables to be connected from below (Fig.
4 and 7).
Ensure a minimum wall clearance on the air
expulsionsideof2m.
Section 3.3.1 Observe „Sound emissions with
external installations“.
3.2.2 Special considerations in case of internal
installation
Substrate: Concrete or screed
Water and electrical pipes/cables are routed
into the heat pump from the top through the
cover (Fig. 8).
3.3 Noise emissions
3.3.1 Noise emissions in case of external in-
stallation
At the air inlet and air outlet sides, the heat
pump is louder than on the enclosed sided.
Therefore point these two sides away from
noise sensitive rooms of the house (e.g.
bedrooms). The air inlet direction should be,
where practicable, in line with the main wind
direction, in other words, air should not be
drawn in against the wind.
Lawn areas and shrubs can contribute to the
reductionofnoiseexpansion.
Avoid installation on large floor areas off
which sound can bounce (e.g. those covered
with slabs) as well as in between reflective
building walls, both of which could raise the
sound level.
Please ensure that noise should not be emit-
ted through the floor of the heat pump or
Dimensions in mm
Air outlet
Air inlet
Hose connection plate
26_03_01_0178

11
26_03_01_0060
26_03_01_0176
26_03_01_0175
1240
800
360 70
220 50
sens du vent dominant
côté rejet
côté aspiration
Fig. 5
Foundation for external installation
when using pressure hoses
Curb stones for external
installation
Dimensions in mm
1 Impact sound installation
2 Floating screed
12
Fig. 6
Fig. 4
Recess screed and impact sound insulation.
Dimensions in mm
through the installation aperture.
Thesoundpowerlevelinexternalinstallations
is 65 dB(A) without silencer accessories and 63
dB(A) with silencer accessories.
Where the heat pump is installed on strip
foundations, seal off the open sides of the
foundation.
3.3.2 Noise emissions in case of internal instal-
lation
Never install the heat pump immediately
below or adjacent to living rooms or bed-
rooms. Never install the heat pump on joists.
Recess floating screeds as shown (Fig. 6.)
Connect the heating flow and return pipes
usingexiblepressurehoses(anti-vibration
measure) (part no. see section 1.6). Protect
allpipexingsandwalltransitionswithanti-
vibration insulation.
Never direct the air inlet and outlet apertures
inexternalwallstowardsneighbouringwin-
dows or living rooms/bedrooms.
3.4 Installing the base unit
The heat pump must be accessible from all
sides.
Position the base unit on the substrate pre-
pared in accordance with section 3.2. Observe
the required air outlet direction.
After installing the heat pump, tighten the
pipe fittings on the pressure and inlet lines of
the compressor with a torque of 100 Nm (Fig.
8, item 10 and 11).
3.5 Base unit installation
Withexternalinstallations,waterandelectri-
cal pipes/cables can be routed into the heat
pump through the bottom, i.e. through the
knock-outs in the floor of the refrigeration
drive.
Water and electrical pipes/cables are routed
into the heat pump from the top (see Fig. 8).
When water pipes are routed through the top,
cut out the caps in the cover (Fig. 8, item 8).
Observe section 4 „Electrical connection“
when routing the electrical cables.
3.6 Heating water connection
3.6.1 The heat pump heating system must be
installed by a qualified contractor in accord-
ance with the water installation drawings,
which are part of the engineering documents.
With regard to the safety equipment of the
heating system, observe
DIN EN 12828 plus TRD 721 safety equipment.
In dual-mode operation, the return water of
the second heat source can flow through the
heat pump. The return water temperature
maybeamax.of60°C.
3.6.2 Protection of heating water pipes against
frost and moisture
(onlyforexternalinstallation)
Protecttheowandreturnpipesinexternal
installation against frost by means of adequate
thermal insulation, and by routing them inside
conduit against moisture (Fig. 7).
Maintain the required insulation thickness in
accordance with the Heating System Order [or
local regulations].
The integral frost protection control (inside the
heat pump), which automatically starts the
circulation pump in the heat pump circuit at +
8 °C and thereby safeguards circulation in all
water-bearing components, offers additional
frost protection. The heat pump is started au-
tomatically no later than from +5 °C onwards,
if the temperature inside the buffer cylinder
drops.
3.6.3 Flow and return connection
Connect the heating water side of the heat
pumpinaccordancewithFig.7(external
installation) or Fig. 8 (internal installation).
Check for leaks.
Withexternalinstallation,turntheconnector
ontheheatingowapprox.225°(Fig.7).
For this, proceed as follows:
– Release clamp 1 and union nut 2.
– Turn connector 3.
– Re-tighten union nut 2 and clamp 1 again.
For internal installation, connect the pipe bend
(item 4 in Fig. 8), which is supplied as part of
the casing accessories, to the heating return
connector (item 5).
Connect anti-vibration mounts of at least 1 m
length to the connector G 1¼“ (male).
Structure-borne noise is substantially pre-
vented by the anti-vibration construction of the
heatpumpandbytheexiblepressurehoses,
which act as anti-vibration mounts.
Air outlet side
Air inlet side
Main wind direction
Air outlet side Main wind direction
Air inlet side

12
Water and electrical connections in external installations
1 Condensate drain hose
2 Heatingow(exiblepressurehose)
3 Heatingreturn(exiblepressurehose)
4 Electrical cables
5 Cable duct for electrical cables
6 Control panel with strain relief for electrical
cables
Fig. 7
6
2
3
4
987 10 1
Water and electrical connections for internal installations
8
2
6
3
1
9
Fig. 8
5
7
1
4
5
10
11
3
1
2
3.6.4 Flushing the heating system
Thoroughly flush the pipework before connect-
ing the heat pump. Debris, such as welding
pearls, rust, sand, sealant etc. can impair the
operational reliability of the heat pump, and
can lead to a blocking of the evaporator.
When filling the heating system with heating
water, observe VDI 2035, sheet 1 [or local
regulations]. Particularly ensure that
during the service life of the system, the
totalllandtop-upwatermustnotexceed
three times the nominal content of the
heating system,
the total alkaline earths in the water must
be < 3.0 mol/m³,
the total water hardness must be < 3
mmol/l
the water must be softened, if the above
requirements are not met.
Generally soften the heating water if the speci-
fic system content is > 20 l/kW output (e.g. in
case of system with buffer cylinder).“
3.6.5 Venting the heating system
Air pockets in the system are detrimental to
the heat pump function.
Vent the pipework thoroughly. For this, also
activate the air vent valve integrated into the
heating flow.
3.6.6 Oxygen diffusion
Corrosion can result on steel components,
when plastic underfloor heating system pipes
areused,whicharenotimpermeabletooxy-
gen or in open heating systems.
The product of corrosion, i.e. rusty sludge, can
settle inside the heat pump evaporator and
can result in output reduction through reduc-
tion of cross-section or in a shutdown being
activated by the high pressure limiter.
Therefore it is advisable to avoid open heat-
ing systems or the installation of steel pipes
in conjunction with plastic pipes in underfloor
heating systems, which are not impermeable
tooxygen.
3.6.7 Scaling
Water quality, operating conditions and the
watervolumearedecisivefactorstotheextent
of scaling. To prevent damage to valves, heat
exchangerandheatingelements,checkthe
water condition and assess it in accordance
with VDI 2035 [or local regulations].
Note: An awareness of hardness in
accordance with the Detergent Act [Germany]
is insufficient. Decisive for scaling is the
concentration of calcium hydrogen carbonate,
which can be supplied by your water supply
company.
1 Condensate drain hose, optionally on
the r.h. or l.h. side
2 Flexiblepressurehose
(heating flow)
3 Flexiblepressurehose
(heating return)
4 Pipe bend
(included in the accessories)
5 Heating return connection
6 electrical cables
7 PG fitting with strain relief
8 Pipe outlet
9 Control panel with strain relief for
electrical cables
10 Pressure line fittings
11 Inlet line fittings
7 Thermal insulation for flow and return pipes
8 Installation conduit for electrical cables and
flow and return pipes
9 Coarse gravel back filling
10 Concrete foundation

13
26_03_01_0171
Fig. 9
Installation of casing and ventilation hoses (internal installation)
Lufteintritt
Luftaustritt
7
7
8
6
6
2
8
3
4
3
1
5
77
3.7 Circulation pump
3.7.1 Circulation pump in the heat pump circuit
(buffer cylinder loading pump)
Determine the pressure drop for the intercon-
necting line between WPKI 3 and the heat
pump, if you are using the cylinders SBP 200
or SBP 700 (buffer cylinders) and the heat
pump Compact Installation WPKI 3 (see table).
The total pressure drop is the sum of the pres-
sure drop for the interconnecting line, the heat
pump and the WPKI 3. Base the sizing of the
circulation pump on the nominal volume flow
and the total pressure drop.
Heat pump WPL 13
13 S
16 S 18 23
Nominal volume flow m³/h 1,0 1,1 1,2 1,4
Pressure drop
Heat pump hPa 105 145 145 190
SBP 700 + WPKI 3 hPa 55 55 55 55
Pressure hose 1¼“ hPa/m 3 3 3 3
3.7.2 Heat meter
For the installation of a heat meter observe,
that most heat meters cause a substantial
pressure drop; therefore size the circulation
pump accordingly larger.
3.8 Condensate drain
3.8.1 At the factory, a ¾“ hose is fitted to the
defrost pan as condensate drain hose, which
terminates near the knock-out on the floor
plate to the right of the refrigeration drive.
Incaseofexternalinstallation,routethishose
– after removing the knock-out, downwards
out of the equipment (Fig. 7).
For internal installations route the defrost
water into a public sewer.
For this, the condensate drain hose can be
routed through the opening in the floor plate
and frame, and by removing the knock-out in
the bottom of the side panel to the right out of
the equipment (Fig. 8).
Ensure that the condensate drain hose is not
kinked anywhere over its entire length and is
routed with a slope.
Check after routing the hose that the con-
densate drains correctly. For this, slowly pour
approx.10lwaterintothedefrostpan.The
water must completely drain out of the defrost
pan.
Use a condensate pump if there is insufficient
fall.
Installtheheatpumpapprox.100mmhigher
or route the condensate hose through the
knock-out(50x50mm)inthesidepaneltothe
left hand side of the equipment (Fig. 8), if a
condensate pump PK 9 (part no. see section
1.6) is used to drain off the condensate.
1 Basic unit
2 Cover (internal installation)
3 Side panels – fan and evaporator side
4 Front panel
5 Back panel
6 Air hose
7 Hose clip (oval)
8 Hose connection plate Item 4 and 5 are
identical
Air outlet
Air inlet

14
3.9 Buffer cylinder
3.9.1. Installation with buffer cylinder
A buffer cylinder is recommended to ensure a
trouble-free heat pump operation. The buffer
cylinder (SBP cylinder) is not only installed as
hydraulic de-coupler for volume flow in the
heat pump circuit and the heating circuit, but
primarily as energy source for defrosting the
evaporator.
3.9.2 Installation without buffer cylinder
Minimum volume flow
Stiebel Eltron recommends that one or several
heating circuits in the heating system are
left open. The open heating circuit(s) should
be installed in the lead room (living room or
bathroom). The single room control can then
be achieved with the help of the FE 7 remote
control. The remaining rooms can then be
equipped with zone or thermostatic valves.
As an alternative, an overflow valve can be
set into the last heating circuit distributor The
minimum volume flow shown in the following
table must be safeguarded.
Heat pump Minimum volume flow
WPL 13 / 13 S 0.4 m³/h
WPL 18 / 16 S 0.5 m³/h
WPL 23 0.6 m³/h
Overflow valve adjustment:
Make the adjustment in accordance with the
following table:
Pump head Pump head to be
adjusted at the
overflow valve*
6 m 4.5 m
7 m 5.5 m
8 m 6 m
*Refers to commercially available Wilo and
Grundfos pumps
Flow sensor connection
When using the accessory 74412 (internal
installationwithairducts)and74413(external
installation), connect the flow sensor B1,
which is an integral part of the heat pump, to
the WPM II.
Valid software versions
The heat pump installation without buffer
cylinder is only permissible with software
version 6504 or higher of the WPM II and
software version 1907 or higher of the IWS.
You can check the software versions on the
third operating level of the WPM.
Heating curve adjustment
Adjust the heating curve carefully, as the
heat pump efficiency will be reduced with an
increasing flow temperature. Heating curves,
which are adjusted too high, lead to the zone
and thermostatic valves closing, which may
lead to the minimum flow rate required for
the heat pump not being achieved.
Procedure for the adjustment of a correct
heating curve:
Fully open the thermostatic valve(s) or zone
valve(s) in the lead room, e.g. in the living
room or bathroom (remove the head of
thermostatic valves) and match the heating
curve at different outside temperatures
(e.g. – 10 °C and + 10 °C), so that the required
temperature results in the lead room. The
thermostatic valve(s) or zone valve(s) in the
lead room should always be fully open.
(Stiebel Eltron recommends that the heating
circuit of the lead room is installed without
thermostatic or zone valves and to achieve the
single room control via a remote control unit).
Standard values for an initial start:
Parameter Underfloor
heating
system
Heating system
with radiators
Heating curve 0.4 0.8
Controller
dynamics
5 15
Room
temperature
20 °C 20 °C
Match the heating curve as follows:Increase
the room temperature parameter if the room
temperature in spring and autumn is too low
(approx.10°Coutsidetemperature).Providing
no remote control is installed, this will lead to
a parallel offset of the heating curve. Increase
the heating curve parameter if the room
temperature is not high enough when outside
temperatures are low.
Then adjust the zone valve or thermostatic
valve to the required temperature.Never
reduce the temperature in the entire building
by closing all zone or thermostatic valves, but
by using the setback programs.
DHC cartridge connection
The second heat source (DHC cartridge),
which is integrated into the heat pump, must
be connected. Connect all three stages for
optimum function.
Other WPM II adjustments
Activate the constant buffer primary pump
operation at the WPM II, and connect the
heating circuit pump to the buffer primary
cylinder pump.
3.10 Second heat source
For dual-mode systems, always connect the
heat pump into the return of the second heat
source (e.g. oil fired boiler).
3.11 Checking the fan
The fan must rotate in the correct direction.
Incorrect transport can slightly shift the fan,
resulting in the fan impeller dragging on the
inlet nozzle. If required, the fan retainer can
be moved to the left or to the right in its slots.
The height can be adjusted by a corresponding
rearrangement of the spacer brackets from the
top to the bottom of the retainer or vice-versa.
1 Spacer brackets, top
2 Spacer brackets, bottom
3 Fan
1
2
3
26_03_01_0183
Drehrichtung
Fig. 10
Rotating
direction

15
HosescanbeextendedbyturningtheBowden
coresintoeachother(approx.30cm).
The total length of hoses on the air inlet and
outletsidemustnotexceed8m.
Amaximumoffour90°bendswitharadius
of at least 600 mm, relative to the hose centre
line, should be installed.
The air hose will tend to sag because of its
exibility;thereforesecureitslengthapprox.
every 1 m.
3.13.3 Air hose connections on the heat pump
andtheexternalwallofthebuildingmatch
the air hose ends to the shape of the oval con-
nectors at the cover and the hose connection
plates. Hose connection plates are available as
accessory (part no. see section 1.6).
Initially withdraw the internal hoses slightly,
push over the connectors and seal with ad-
hesive tape (supplied with the cover). Then
pulltheexteriorhoseforward,andsecurethe
hoses well with the oval hose clips, which are
also supplied with the cover (Fig. 3 and 9).
Always cover the air inlet and outlet open-
ings using a wire grille, and secure the hoses
against slippage.
3.12 Casing installation
1. On the base unit, remove eight quick-
release fittings (at each point one at the top
and bottom centre) and keep safe for later
use.
2. Position the lid onto the equipment and
secure with one quick-release fitting at each
side.
3. Make all water and electrical connections to
the equipment.
4. Hook the side panels, the front and back
panel into the base unit, and secure with
respectively one quick-release fitting on
each side.
3.13 Fitting the air hoses (only in-
ternal installation)
3.13.1 Air hoses guide the inlet air from the
outsidetotheheatpumpandexhaustairfrom
the heat pump to the outdoors. These hoses
arehighlyexible,thermallyinsulatedandare
self-extinguishingincaseofreinaccordance
with ASTMD 1692-67 T.
Thermally insulated air hoses are available in
lengths of 3 and 4 m (part no. see section 1.6).
3.13.2 Information about air hose routing
Use a sharp knife for trimming the hoses to
size; use a wire cutter for cutting through the
Bowden core.
Installation and casing (external installation)
Fig. 11
2
3
5
1
3
4
1 Basic unit
2 Cover(externalinstallation)
3 Side panels – fan and evaporator side
4 Front panel
5 Back panel
(Item 4 and 5 are identical)
26_03_01_0172

16
1 Mains power supply cable – compressor)
2 Mains power supply cable (DHC)
3 Control cable – mains)
4 BUScable:J-Y(St)2x2x0.8mm²
5 Control cable (HS 2 [DHC])
1
2
3
4
5
Fig. 12
4 Electrical connection
4.1 Power supply company
Notify your local power supply company of the
electrical connection.
Only qualified electricians must carry out the
installation in accordance with these instruc-
tions.
This equipment must only be connected to a
mains power supply with an impedance of
Zmax≤290mΩ.
Before any work, isolate the equipment from
the power supply at the control panel.
Observe VDE 0100 and the regulations of your
local power supply company.
4.2 Power switch
The heat pump must be able to be separated
from the mains power supply by an additional
isolator, which disconnects all poles with at
least 3 mm contact separation. For this pur-
pose, use contactors, mains isolators, fuses,
etc. on site.
4.3 Terminals inside the HP
Terminals are inside the WPL control panel
(Fig. 13 and 16). The terminals become acces-
sible by removing the front panel.
During the installation, the control panel can
be withdrawn from the housing towards the
front.
The following are connected inside the panel:
– the power supply of the IWS heat pump
control unit
– the power supply of the compressor
– the power supply of the secondary heater
DHC (internal heat source 2)
C26_03_01_0170
– the BUS cable
Ensure that High, Low and Ground are cor-
rectly connected.
– the enabling signal for stand alone opera-
tion on terminal 5
The frost protection sensor on terminal X31/1
& 2 is already connected to the IWS.
4.4 IWS
The IWS (abbreviation for Integrated heat
pump control unit [German]) is a PCB fitted
as standard into the heat pump control panel.
The IWS controls the contactors for the com-
pressors and the soft start, accommodates the
signal inputs for high pressure, low pressure
and central faults and contains the BUS inter-
face to the WPM II.
Use cables in accordance with regulations for
all connections (Fig. 12).
Check the strain relief function.
Observe the operating instructions for the heat
pump manager WPM.
4.5 Circulation pump
Connect the circulation pump for the heat
utilisation side in accordance with the electri-
cal connection diagram (Fig. 15 and 18) or the
engineering documents.
4.6 Stand alone operation
In emergencies, this heat pump can also oper-
ate without the heat pump manager (see page
25). However, under such circumstances the
system is no longer frost protected and the
system may freeze up.
4.7 For external installation
use only cables suitable for outdoor use to
VDE 0100. Route such cables through a con-
duit (protective pipe); entry into the heat
pump can be arranged from below (Fig. 7).
Route the electrical cables inside the heat
pump in the cable channel provided (Fig. 7,
item 5).
4.8 For internal installation
route the electrical cables through the cable
entry at the top into the heat pump, and se-
cure with strain relief (PG fittings) (Fig. 3 and
8).
For this observe, that the open PG fittings are
used (Fig. 12) for mains supply cable (com-
pressor), control cable and BUS cable.
!
The compressor must only turn in one
direction. Should the compressor fail
to start, interchange two phases to alter the
direction of rotation. You can check the di-
rection of rotation on a diode on the phase
monitoring relay (Fig. 13). The rotational di-
rection is correct if the diode illuminates. An
incorrect rotational direction will not trigger
any fault message to the WPM. The com-
pressor starts again after the pre-selected
parameter idle time has expired.
After connecting all electrical cables, refit and
seal the cover over the mains terminal (X3)
(Fig. 13).
VDE 0298-4 specifies that, in accordance with the relevant fuse protection, the following cable cross-sections are to be used:
Fuse Cable cross-section
16 A 2,5mm²
1,5mm²incaseoftwocoresunderloadandroutingoverawallorinsideawallmountedconduit.
25 A 6,0mm²whenroutingthecablethroughawall.
4,0mm²whenroutingamulti-corecableoverawallorinsideawallmountedconduit.
35 A 6,0mm²whenroutingamulti-corecableoverawallorinsideawallmountedconduit.
For fuse ratings, see specification

17
Fig. 13
X3 Mains supply
WP Heat pump (compressor)
L1, L2, L3, PE
DHC Supplementary heater
N, L1, L2, L3, PE
X2
X4X3
PE
3/PE~400/50 3/N/PE~400/50 1/N/PE~230/50
Provide separate fuses for the three power
circuits WP, DHC and control.
Phase monitoring relay
Connected
load
Terminal
assignment
2,6 kW L1 N PE
3,0 kW L2 N PE
3,2 kW L3 N PE
5,6 kW L1 L2 N PE
5,8 kW L1 L3 N PE
6,2 kW L2 L3 N PE
8,8 kW L1 L2 L3 N PE
X4 Terminal - control
Mains supply: L, N, PE
Control inputs:
2. HS internal heat source (DHC)
 Ext.ST Standaloneoperation
X2 Terminal LV
H BUS high
L Bus Low
BUS Ground
“ + “ BUS “ + “ (not connected)
26_03_01_0056
Electrical connection WPl 13, WPL 18 and WPL 23

18
Fig. 14
Wiring diagram for heat pumps WPL 13, WPL 18 and WPL 23
26_03_01_0058
A2 Integral heat pump control unit IWS B1 Temp. sensor, HP flow E1 Internal second Heat Source, (DHC) E2 Oilsump heating F1 Low pressure limiter F2 High pressure limiter F4 Temp- limiter, hotgas F5 Temp. limiter for DHC F6 Phase control relay F7 Fan temperature limiter F13 Frost protection temperature sensor K1 Relay, resitor bridge K2 Relay, compressor start
K4 Fan contactor K5 Instantaneous water heater relay K6 Instantaneous water heater relay K7 Instantaneous water heater relay M1 Compressor motor M2 Motor, fan N1 Defrost end control thermostat N2 Defrost pressure differential switch N3 Oil sump heater thermostat R1 Start-Resistor R2 Start-Resistor R3 Start-Resistor X1 Terminals
X2 LV terminal X3 Power supply X4 Terminals - control X23 Earth block - power supply X26 Earth terminal block X27 Base luster terminal 4-pole X28 Base luster terminal 2-pole X29 Block for IWS 12-pole X30 Block for IWS 3-pole X31 Block for IWS 5-pole Y1 Changeover valve - defrost Z3 Operating condenser, compressor

19
L H
Kleinsp
BUS
Steuerung
(Netz)
L PE 2. WE
X3
L1
L2
L3
WP
N
L1
L2
L3
DHC
NETZ
PE
L1
L2
N
N
X4
X2
max. 2 A gl
16 A gl
B1
B1
L3
Fig. 15
Electrical connection diagram for heat pumps WPL 13, WPL 18 and WPL 23 with heat pump manager WPM II
Time switch for power OFF periods
Control phase L
without OFF period
Control phase L`
with OFF period
N
L3
L2
L1
PE
N
PE
L
1/N/PE
~ 50Hz
230V
Supply from the
domestic meter
3/N/PE
~ 50Hz
400V
Supply from
the heat pump
meter
Heat Pump Manager WPM II
External Flow Return DHW 2nd HS Source Mixer Pulse 1 3 Bus H Bus L Bus Bus + Sensor 1 Sensor 2
Solar Mixer – Mixer + 2nd HS 2nd HS Circulation DHW HC 2 HC 1 Source Buffer 2 Buffer 1 Pump L ESC L' Mains L Mains N
Bus cable
4x1,5mm2
FE7
X2 X1
X5 X4
X3
3/N/PE
~ 50Hz 400V
FE7
26_03_01_0059

20
Provide separate fuses for the three power
circuits WP, DHC and control.
X3 Mains supply
WP Heat pump (compressor)
L, N, PE
DHC Supplementary heate
L, L', N, PE
WPAB R, RC
Connected
load
Terminal
assignment
3,0 kW L PE
3,2 kW L‘ N PE
6,2 kW L L‘ N PE
X4 Terminal - control
Mains supply: L, N, PE
Control inputs:
2. HS internal heat source (DHC)
 Ext.ST Standaloneoperation
WPAB S, ON, N
X2 Terminal LV
H BUS High
L Bus Low
BUS Ground
“ + “ BUS “ + “ ((not connected)
B1 Temp. sensor, HP flow
X2X4
X3
PE
1/N/PE~230/50
1/N/PE~230/50
1/N/PE~230/50
Fig 16
C26_03_01_0829
Electrical connection WPl 13 S and WPL 16 S