STIEBEL ELTRON WPL 33 User manual

WPL 33
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.
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 3
2.2 Performance diagram 4
2.3 Performance diagram 5
3 Installation, connection, sound emissions
and commissioning 6
3.1 Transport 6
3.2 Installation location 6
3.3 Noise emissions 6
3.4 Installing the base unit 7
3.5 Base unit assembly 7
3.6 Heating water connection 7
3.7 Circulation pump 9
3.8 Condensate drain 9
3.9 Buffer cylinder 9
3.10 Second heat source 9
3.11 Checking the fan 10
3.12 Casing components 10
3.13 Installing the air hoses 10
4 Electrical connection 11
4.1 Power supply company 11
4.2 Power switch 11
4.3 Terminals inside the HP 11
4.4 IWS 11
4.5 Circulation pump 11
4.6 Stand-alone operation 11
4.7 External installation 11
4.8 Internal installation 11
5 Commissioning 16
6 Operation and control 16
7 Maintenance and cleaning 16
7.1 Maintenance 16
7.2 Cleaning 16
8 Fault remedies 17
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.
C26_03_01_0679
Risk of injury
Where children or persons with
limited physical, sensory or mental capa-
bilities are to be allowed to control this
appliance, ensure that this will only happen
under supervision or after appropriate in-
structions by a person responsible for their
safety.
Children should be supervised to ensure
that they do not play with the appliance.

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
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safety functions through the WPM heat
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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
flow 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
unfavourable 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 pres-
sure - 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, modifi-
cation and testing of used electrical equipment.
VDE 0298-4
TAB: Technical connection conditions for connections
to the LV mains.
On the refrigerant side:
EN 378: Safety and environmental requirements
DIN 7003: (draft)
General:
Collation of technical requirements for boiler rooms,
e.g. boiler room guidelines or national/local Build-
ing 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
Type WPL 33
Standard delivery – external installation Part no.
–Base unit 18 53 48
–Accessories (comprising the casing). 18 53 69
Standard delivery – internal installation Part no.
–Base unit 18 53 48
–Accessories (comprising the casing) 18 53 68
Special accessories - internal installation Part no.
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 PK9 18 21 38
Special accessories – external and internal installation (required) Part no.
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
Cylinder SBP 200 E 18 54 58
Cylinder SBP 400 E 22 08 24
Cylinder SBP 700 E 18 54 59
Special accessories – external and internal installation Part no.
Mixer module with wall mounting enclosure, MSMW 07 45 19
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
Hose fitting for pressure hoses 5 m 07 06 92
Heat pump Compact Installation WPKI 5 22 08 30
UP kit 25 - 60 (for WPKI 5) 07 43 25
UP kit 25 -80 (for WPKI 5) 07 43 16
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 33
Order no. 18 53 48
Type and operating mode
Type
Compact/split/open version Compact
Operating mode mono-mode
alternative dual-mode
parallel dual-mode
Dimensions, weights, connection dimensions
Shipping unit - base equipment
Dimensions (Basic unit) L/W/H mm 1332 x 784 x 1116
Weight kg 260
Refrigerant Type R 407C
Filling weight kg 4.4
Pipe connector – heating side
Flow and return Inch G 1¼” male
Hose connector - air
Inlet and exhaust connectors (only for internal installation) mm 248 x 721 oval
Output
Heat output for A-7/W35 1) (both compressors) kW 14,9
Heat output for A2/W35 2) (single compressor) kW 10,8
Power consumption for A-7/W35 1) (both compressors) kW 5,8
Power consumption for A2/W35 2) (single compressor) kW 3,3
Performance factor for A-7/W35 1) (both compressors) 2,7
Performance factor for A2/W35 2) (single compressor) 3,3
Power consumption – auxiliary heater kW 8.8
Process medium
Volume flow, hot side WNA min4) m³/h 1.4
Internal pressure differential hPa 190
Volume flow, cold side WQA min3) m³/h 3500
Externally available static pressure differential (only for internal version) hPa 1.0
Operating temperature limits
WQA min. / WQA max3) °C – 20 / + 30
WNA min. / WNA max4) °C + 15 / + 60
Electrical specification
Mains supply, Fuse A 25 gl
Secondary heater DHC (internal HS 2), Fuse A 16 gl
Control circuit, Fuse A 16 gl
Protection EN 60529 (DIN VDE 0470) IP 14 B
Voltage / Frequency - compressor V/Hz 3/PE~400/50
Voltage / Frequency – secondary heater DHC (internal HS 2) V/Hz 3/N/PE~400/50
Voltage / Frequency – control circuit V/Hz 1/N/PE~230/50
Start-up current (start-up current limit) A < 30
Defrost
Time/Demand/manual defrost Demand / manual
Type of defrost: Hot gas/electrical/air/flow reversal Flow reversal
Heating the drip pan yes, supercooler
Other model characteristics
Frost protection measures yes/no yes
Corrosion protection – frame and housing 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
(external installation with silencer accessories) dB(A) 63
(internal installation; internal/external) dB(A) 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
3) WQA = Heat source system (cold side)
4) WNA = Heat utilisation system (hot side)
2 Specification (check details on the rating plate)
2.1 Specification (equipment information)

4
Fig. 1a
2.2 Output diagram for heat pump WPL 33 (both compressors)
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]
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5
2.3 Output diagram for heat pump WPL 33 (single compressor)
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
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6
1390
1434
1280
800
1300 750
1300
1160
750
Luftaustritt
2070
Schlauchanschlussplatte
248
721
Lufteintritt
158 461
81
175
93
1390 800
26_03_01_0667 26_03_01_0666
Fig. 3
Fig. 2
Dimensions in mm
External installation
Internal installation
3 Installation, connection and
sound emissions
3.1 Transport
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
contact 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. be-
drooms). 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
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.
Dimensions in mm
Air outlet
Air inlet
Hose connection plate

7
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1390
800
260 100
150 50
Hauptwindrichtung
Luftaustrittseite
Lufteintrittseite
1200
650
Hauptwindrichtung
Luftaustrittseite
Lufteintrittseite
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
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 in-
stallation
Where possible, install the heat pump in a
cellar or on the first floor, but never immedi-
ately below or adjacent to living rooms or be-
drooms. Never install the heat pump on joists.
The sound power level in internal installations
is 58 dB(A) inside the installation room and
62 dB(A) at the air inlet and outlet openings.
Connect the heating flow and return pipes
using flexible pressure hoses (anti-vibration
measure) (part no. see section 1.6). Protect
all pipe fixings and wall transitions with anti-
vibration insulation. Never direct the air inlet
and outlet apertures in external walls towards
neighbouring windows or living rooms/be-
drooms.
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 instal-
ling 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 10/11).
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 accor-
dance with the water installation drawings,
which are part of the engineering documents.
With regard to the safety equipment of the he-
ating 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 flow 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. For external and internal in-
stallations, first connect the pipe bend (item
8, Fig. 7 and 8), which is supplied as part of
the casing accessories, to the connector from
the heating flow or return (item 9, Fig. 7 and
8). Connect anti-vibration pipes of at least
1 m length to the connector G 1¼“ (male).
Structure-borne noise is substantially preven-
ted by the anti-vibration construction of the
heat pump and by the flexible pressure hoses,
which act as anti-vibration mounts. .
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 preven-
ted by the anti-vibration construction of the
heat pump and by the flexible pressure hoses,
which act as anti-vibration mounts.
3.6.4 Flushing the heating system
Thoroughly flush the pipework before connec-
ting the heat pump. Debris, such as welding
pearls, rust, sand, sealant etc. can impair the
Air outlet side
Air inlet side
Main wind direction
Air outlet side Main wind direction
Air inlet side
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8
Water and electrical connections in external installations
1 Condensate drain hose
2 Heating flow (flexible pressure hose)
3 Heating return (flexible pressure hose)
4 Electrical cables
5 Cable duct for electrical cables
6 Control panel with strain relief for electrical
cables
Fig. 7
Water and electrical connections for internal installations
Fig. 8
operational reliability of the heat pump, and
can lead to a blocking of the evaporator.
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.
Water quality
To prevent equipment damage through scaling,
observe the following when filling the system with
heating water:
zThe total water hardness must be < 7° dH.
zThe total alkaline earths in the water must be <
1.2 mol/m³.
zVDI 2035 sheet 1
Please note! Fully desalinated/softened water or
natural rainwater must not be used, as that would
result in increased corrosion. Suitable appliances
for softening as well as filling and flushing heating
systems can be hired from our customer service
department or can be obtained from the trade.
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 heating
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 Electrical cables
5 PG fitting with strain relief
6 Pipe duct
7 Installation conduit for electrical cables
8 Pipe-bow (supplementary)
9 Flow connection
10 Air-vent
11 Coarse gravel back filling
12 Concrete foundation
64
2
3
11
7
1
8
5
9
10
11
C26_03_01_0669
6
23
4
711112
5
8
9
10
7 Control panel with strain relief for electrical
cables
8 Pipe bend (included in the accessories)
9 Heating return connection
10 Screw-connect pressure-pipe
11 Screw-connect suction pipe
12 High limit safety cut-out for DHC
12
C26_03_01_0670

9
Fig. 9
Installation of casing and ventilation hoses (internal installation)
3.7 Circulation pump
3.7.1 Circulation pump in the heat pump circuit
(buffer cylinder loading pump)
Determine the pressure drop for the inter-
connecting line between WPKI 5 and the heat
pump, if you are using the cylinders SBP 200
or SBP 700 (buffer cylinders) and the heat
pump Compact Installation WPKI 5 (see table).
The total pressure drop is the sum of the pres-
sure drop for the interconnecting line, the heat
pump and the WPKI 5. Base the sizing of the
circulation pump on the nominal volume flow
and the total pressure drop.
Heat pump WPL 33
Nominal volume flow m³/h 1,4
Pressure drop
Heat pump hPa 190
SBP 700 + WPKI 5 hPa 55
Pressure hose 1¼“ hPa/m 4
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
downwards out of equipment through the
aperture in base unit (Fig. 7). For internal in-
stallations route the defrost water into a public
sewer. The condensate hose can be routed to
the right, front or to the left out of the equip-
ment. For this, break out the knock-outs in the
side panel or in the floor plate of the refrige-
ration drive and either at the front door or the
side panel (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,
if the condensate pump PK 9 (part no. see sec-
tion 1.6) is used for draining the condensate.
3.9 Buffer cylinder
A buffer cylinder is required to ensure trouble-
free heat pump operation. The buffer cylinder
(cylinder SBP) 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.
3.10 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).
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
7
7
8
6
6
2
8
3
4
3
1
5
77
C26_03_01_0664

10
Installation and casing (external installation)
Fig. 11
2
3
5
1
3
4
1
2
3
1 Spacer brackets, top
2 Spacer brackets, bottom
3 Fan
Drehrichtung
Fig. 10
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.
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 flexible, thermally insulated and are
self-extinguishing in case of fire 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.
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
flexibility; 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 adhe-
sive 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 openings
using a wire grille, and secure the hoses
against slippage.
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)
Rotating
direction
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C26_03_01_0662

11
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])
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 m:.
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.
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.
For fuse ratings, see specification
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). The terminals become accessible 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)
– the BUS cable
Ensure that High, Low and Ground are cor-
rectly connected.
– the enabling signal for stand alone operati-
on 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.
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 uti-
lisation side in accordance with the electrical
connection diagram (Fig. 15) or the enginee-
ring documents.
4.6 Stand alone operation
In emergencies, this heat pump can also
operate without the heat pump manager (see
page 17). 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 condu-
it (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).
12 34 5
C26_03_01_0671
4.8 For internal installation
route the electrical cables through the cable
entry at the top into the heat pump, and
secure 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 in the appliance
can only turn in one direction.
If the appliance is not connected correctly,
the compressor remains in operation for 10
seconds then switches OFF.
In this case the heat pump manager displays
the fault message "no output". Two phases
should then be interchanged to alter the
direction of rotation.
After connecting all electrical cables, refit and
seal the cover over the mains terminal (X3)
(Fig. 13).

12
Plombendraht
durch die
Schraubenköpfe
58907/1-2/10.84
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.
Mains impedance: Zmax ≤ 0.296 :
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)
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
C26_03_01_0672

13
Fig. 14
Wiring diagram for heat pumps WPL 33
A1 Integral heat pump control unit IWS B5 Temperature sensor Heißgas E1 Instantaneous water heater (DHC) E2 Oil sump heater Comp. 1 E3 Oil sump heater Comp. 2 F2 High pressure limiter F5 High limit safety cut-out for DHC F7 Fan temperature limiter F13 Frost protection temperature sensor K1 Contactor – resistance start Comp. 1 K2 Contactor – compressor start Comp. 1
K3 Contactor – resistance start Comp. 2 K4 Contactor – compressor start Comp. 3 K5 Contactor - instantaneous water heater K6 Safety Contactor K7 Contactor - fan M1 Motor - compressor 2 M2 Motor - compressor 2 M3 Motor - fan N2 Defrost – pressure differential switch N3 Oil sump thermostat
P1 High pressure transducer P3 Low pressure transducer R1 Start-up resistance Comp. 1 R2 Start-up resistance Comp. 1 R3 Start-up resistance Comp. 1 R4 Start-up resistance Comp. 2 R5 Start-up resistance Comp. 2 R6 Start-up resistance Comp. 2 X1 Terminals X2 Terminal LV X3 Mains supply
X4 Terminals - control X25 Earth block – mains supply X26 Earth plug-in block X27 Socket terminal strip 2-pole X28 Socket terminal strip 4-pole X29 Socket plug IWS 12-pole X30 Socket plug IWS 3-pole X31 Socket plug IWS 5-pole Y1 Changeover valve - defrost Z3 Supressor
C26_03_01_0065

14
L
H
Kleinsp
BUS
Steuerung
(Netz)
L PE 2.WE
X3
L1 L2 L3
WP
NL1 L2 L3
DHC
NETZ
PE
L1
L2
N
N
X4 X2
max. 2Agl
16 Agl
L3
C26_03_01_0673
Fig. 15
Electrical connection diagram for heat pumps WPL 33 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
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
2/N/PE
~ 50Hz
4000V
FE7

15
5 Commissioning
See the operating instructions for the
heat pump manager WPM II.
Set parameter 35 HEAT PUMP DHW
STAGES either to 01 or to 02 if DHW
heating/loading is required.
6 Operation and control
A WPM heat pump manager is required to
operate the heat pump. It regulates the entire
heating system and all required adjustments
are made on this control unit.
See the operating instructions for the
WPM II heat pump manager.
Only qualified contractors must make
adjustments on the WPM heat pump
manager.
Never isolate the heat pump from the mains
power supply, even outside the heating
season, otherwise the system will not be
protected against frost. Generally, the system
must not be shut down during summer, as the
WPM is provided with an automatic summer/
winter changeover facility. Set the WPM to
standby when the system is taken out of use.
This retains the safety functions designed to
protect the system (e.g. frost protection).
Drain the water side of the heat pump if there
is a risk of frost, and the heat pump has been
completely shut down.
7 Maintenance and cleaning
7.1 Maintenance
The heat pump operates under automatic con-
trol and requires no specific maintenance.
Keep the air inlet and outlet openings of the
heat pump free from snow and leaves.
7.2 Cleaning
7.2.1 Remove all leaves and accumulated dirt
from the evaporator fins, which are accessible
after the casing parts on the condenser side
have been removed.
7.2.2 Regularly check the condenser drain .
Remove dirt and blockages.
7.2.3 When the heat pump operation is im-
paired through deposits of corrosion bypro-
ducts (rust sludge) inside the condenser, the
customer service can only use solvents and a
flushing pump to dissolve such deposits.

16
8 Troubleshooting
8.1 See operating and installation instructions WPMW
8.2 Checking the settings on the IWS
If a fault cannot be located using the
WPM II, in emergencies the control
panel needs to be opened to check the IWS
adjustments. These checks must only be car-
ried out by a qualified contractor:
Slide switches (WP-Typ)
You can select various compressor systems
with the slide switches (WP-Typ) to. In the
factory, this was set to 2, subject to the heat
pump type WPL 33.
2 Dual-compressor with internal HS 2
(DHC)
If the WPL is to be operated in dual-mode
together with a second heat source other than
the DHC, or alternatively as module with ano-
ther WPL, then set the slide switches (WP-Typ)
to
10 In that case, never connect the internal
HS 2 (DHC) (control and supply).
Check that the slide switches (WP-Typ) is set
correctly.
Slide switches (S3))
The switches 1 and 2 have no effect for WPL.
Switch 3 position
Switch ON: SERVICE mode
Corresponding compressors (defaulted by set-
ting the slide switches (WP-Typ)) are started in
one second intervals.
Switch 4 position
Switch ON: STAND ALONE operation
Should the WPM develop a fault, the heat
pump can, in emergencies, be operated in
stand alone operation. In this operating mode
there is no communication with the WPM II
heat pump manager. The heat pump regulates
to a fixed temperature. The heat pump starts
at 50 °C and stops at 55 °C. The frost protec-
tion sensor connected to the IWS at terminals
sensor 1,2 is no used to sense the control
magnitude, i.e. frost protection and protection
against freezing up during defrosting of an ex-
ternally installed heat pump are now lost.
In addition, remove the jumper bet-
ween terminal X4/5 and X4/6, and
connect 230 V to terminal X4/5. The operating
mode is indicated by the r.h. green LED.
LEDs
Red LED: Flashing or static:
The LED flashes if the heat pump fault occurs
once.
The system will be shut down.
The red LED becomes static, if more than two
heat pump faults occur within five hours. The
system will be shut down permanently.
In both cases, the fault will be entered into the
error list (parameter 46) of WPM. Operation
can recommence 10 minutes after the fault has
been removed; the LED goes out.
To delete the fault on the IWS, select parame-
ter 52, then press PRG to reset the IWS. The
internal counter will then be returned to zero.
Heat pump faults indicated by the LED: High
pressure, low pressure, central and hardware
faults on the IWS. (see parameter 46)
Green LED centre: Flashes during initialisation,
and becomes steady after the BUS address has
been allocated successfully. Only then is the
communication with WPM possible.
Green LED right: Illuminates constantly, when
stand alone operation has been selected.
Reset button
In case of incorrect initialisation, see section
5.4.1 of the WPM II operating and installation
instructions.
Fig. 16
LEDs
26_03_01_0661
BA
Slide switches (S1) Reset button
Slide switches (WP-Typ)
C26_03_01_0661

17
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