STIEBEL ELTRON WPL 15 A2W Premium Specification sheet

OPERATION AND INSTALLATION
Air source heat pump
» WPL 15 A2W Premium
» WPL 25 A2W Premium

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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information ___________________________________________ 3
1.1 Relevant documents________________________________________________ 3
1.2 Safety instructions__________________________________________________ 3
1.3 Other symbols in this documentation __________________________ 4
1.4 Units of measurement _____________________________________________ 4
1.5 Standardized output data _________________________________________ 4
2. Safety____________________________________________________________ 4
2.1 Intended use_________________________________________________________ 4
2.2 Safety instructions__________________________________________________ 4
3. Register your product _________________________________________ 5
4. Appliance description _________________________________________ 5
4.1 Properties ____________________________________________________________ 5
4.2 Function ______________________________________________________________ 6
5. Settings _________________________________________________________ 6
6. Maintenance and care _________________________________________ 7
7. Troubleshooting ________________________________________________ 7
INSTALLATION
8. Safety____________________________________________________________ 8
8.1 General safety instructions _______________________________________ 8
8.2 Instructions, standards and regulations _______________________ 8
9. Appliance description _________________________________________ 8
9.1 Accessories___________________________________________________________ 8
10. Preparation _____________________________________________________ 8
10.1 Sound emissions____________________________________________________ 8
10.2 Minimum clearances_______________________________________________ 9
10.3 Installation near ocean/salt water______________________________10
10.4 Preparing the installation location_____________________________10
10.5 Installing the supply lines________________________________________10
10.6 Siting _________________________________________________________________10
10.7 WPM heat pump manager _______________________________________12
10.8 Buffer tank __________________________________________________________12
10.9 Preparing the electrical installation ___________________________12
11. Installation_____________________________________________________13
11.1 Transport ____________________________________________________________13
11.2 Heating water connection________________________________________13
11.3 Flow and return connection _____________________________________13
11.4 Fitting the push-fit connectors__________________________________14
11.5 Oxygen diffusion___________________________________________________15
11.6 Filling the heating system _______________________________________15
11.7 Minimum flow rate ________________________________________________15
11.8 Setting the flow rate on the heating side _____________________16
11.9 Condensate drain __________________________________________________17
11.10 External second heat generator ________________________________17
11.11 High limit safety cut-out for area heating system___________17
12. Electrical connection__________________________________________ 17
12.1 Access to the terminal area______________________________________17
12.2 WPL15/25A2W Premium ________________________________________19
12.3 Closing the terminal area ________________________________________19
12.4 Ribbon heater ______________________________________________________19
13. Commissioning ________________________________________________21
13.1 Checks before commissioning___________________________________21
13.2 Using the appliance with an external second heat
generator____________________________________________________________21
13.3 Initial start-up______________________________________________________22
13.4 Appliance handover _______________________________________________22
14. Settings ________________________________________________________ 22
14.1 Silent mode _________________________________________________________22
15. Appliance shutdown __________________________________________23
15.1 Standby mode ______________________________________________________23
15.2 Power interruption ________________________________________________23
16. Maintenance ___________________________________________________ 23
17. Troubleshooting _______________________________________________ 23
17.1 Checking the IWS DIP switch settings _________________________24
17.2 Light emitting diodes (LEDs)_____________________________________26
17.3 Reset button ________________________________________________________26
17.4 Resetting the high limit safety cut-out ________________________26
17.5 Fan noise ____________________________________________________________26
18. Specification ___________________________________________________28
18.1 Dimensions and connections ____________________________________28
18.2 Wiring diagram ____________________________________________________30
18.3 Application limit ___________________________________________________32
18.4 Output diagrams, WPL 15 A2W Premium _____________________33
18.5 Output diagrams, WPL 25 A2W Premium _____________________36
18.6 Data table ___________________________________________________________39

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- The appliance may be used by children aged8
and older and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience and know-how, provided that they
are supervised or they have been instructed
on how to use the appliance safely and have
understood the potential risks. Children must
never play with the appliance. Children must
never clean the appliance or perform user
maintenance unless they are supervised.
- The connection to the power supply must be
in the form of a permanent connection. Ensure
the appliance can be separated from the power
supply by an isolator that disconnects all poles
with at least 1/8˝ (3mm) contact separation.
- Maintain the minimum clearances to ensure
trouble-free operation of the appliance and fa-
cilitate maintenance work.
- Maintenance work, such as checking the elec-
trical safety, must only be carried out by a
qualified contractor.
- We recommend regular inspection (to establish
the current condition of the system), and main-
tenance by a qualified contractor if required (to
return the system to its original condition).
- Following disconnection from the power sup-
ply, parts of the appliance may remain ener-
gized for 2minutes until the inverter capacitors
have discharged.
- Never interrupt the power supply, even outside
the heating season. The system's active frost
protection is not guaranteed if the power sup-
ply is interrupted.
- If the heat pump is completely switched off and
there is a risk of frost, drain the system on the
water side.
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1. General information
The chapters “Special information” and “Operation” are intended
for both users and qualified contractors.
The chapter “Installation” is intended for qualified contractors.
Note
Read these instructions carefully before using the appliance
and retain them for future reference.
Pass on the instructions to a new user if required.
1.1 Relevant documents
Instructions for the WPM heat pump manager
Operating and installation instructions for system
components
Commissioning checklist for heat pump
1.2 Safety instructions
1.2.1 Structure of safety instructions
!
KEYWORD Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
f Steps to prevent the risk are listed.
1.2.2 Symbols, type of risk
ZźăĒù `źĤ¼ĒÏļêń÷
Injury
Electrocution
1.2.3 Keywords
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DANGER Failure to observe this information will result in serious in-
jury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-serious
or minor injury.
!

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1.3 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
f Read these texts carefully.
ZźăĒù B¼|ĉêĉÖ
Material losses
(appliance damage, consequential losses and environmental
pollution)
Appliance disposal
f This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.4 Units of measurement
Note
All measurements are given in inches (mm) unless stated
otherwise.
1.5 Standardized output data
Information on determining and interpreting the specified standard-
ized output data.
1.5.1 AHRI 550/590
The output data specifically mentioned in texts, diagrams and tech-
nical data sheets has been calculated according to the test conditions
of the standard shown in the heading of this section.
Generally, the test conditions stated above will not fully match the
conditions found at the installation site of the system user.
The usage of antifreeze glycol is strongly recommended. It has an
influence on the efficiency and heat capacity, depending on the
concentration of glycol.
Depending on the chosen test method and the extent to which this
method differs from the test conditions defined in the first paragraph
of this section, any deviations can be considerable.
Confirmation of the specified output data can only be obtained if
the test conducted for this purpose is also performed in accordance
with the test conditions defined in the first paragraph of this section.
2. Safety
2.1 Intended use
Observe the application limits listed in chapter "Specification / Data
table".
The appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in a non-do-
mestic environment, e.g. in a small business, as long as it is used
in the same way.
Any other use beyond that described shall be deemed inappropriate.
Observation of these instructions and of instructions for any acces-
sories used is also part of the correct use of this appliance.
2.2 Safety instructions
Observe the following safety instructions and regulations.
- Only qualified contractors may carry out the electrical work
and installation of this appliance.
- The qualified contractor is responsible for adherence to all ap-
plicable regulations during installation and commissioning.
- The appliance should only be operated once it is fully installed
and all safety equipment has been fitted.
- Protect the appliance from dust and dirt during building work.
!
WARNING Injury
The appliance may be used by children over 8 years of
age and persons with reduced physical, sensory or mental
capabilities or a lack of experience and expertise, provided
that they are supervised or they have been instructed on
how to use the appliance safely and have understood the
potential risks. Children must never play with the appli-
ance. Children must never clean the appliance or perform
user maintenance unless they are supervised.
!
WARNING Injury
f For safety reasons, only operate the appliance with
the casing closed.
WARNING Electrocution
Contact with live components presents a threat to life.
Damage to the electric insulation or to individual compo-
nents may result in a threat to life.
f If there is damage to the insulation, disconnect the
power supply and arrange a repair.
All work on the electrical installation must be carried out
by a qualified contractor.
WARNING Scalding
The water in the DHW tank can be heated to temperatures
in excess of 149 °F (65 °C). There is a risk of scalding at
outlet temperatures in excess of 110 °F (43 °C).
f Ensure you do not come into contact with the water
when discharged.
WARNING Burns
Touching hot components can lead to burns.
When working on hot components, always wear protective
working clothing and safety gloves.
The pipework connected to the DHW outlet of the appliance
can reach temperatures in excess of 149 °F (65 °C).
WARNING Burns
In the case of a fault, temperatures up to the high limit
safety cut-out temperature limit can occur (See 18.6, “Data
table”, pg. 39).
!

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WARNING Scalding
The appliance is filled with refrigerant at the factory.
In case of leaking refrigerant, avoid coming into contact
with the refrigerant or inhaling the released vapors. Ven-
tilate the rooms affected.
!
CAUTION Injury
Never place any objects on top of the appliance. If objects
are left on the appliance, noise emissions may increase
due to resulting vibrations, and the objects could fall and
cause injury.
!
CAUTION
To reduce the risk of excessive pressures and tempera-
tures in this water heater, install temperature and pressure
protective equipment required by local codes and no less
than a combination temperature and pressure relief valve
certified by a nationally recognized testing laboratory that
maintains periodic inspection of production of listed equip-
ment or materials, as meeting the requirements for Relief
Valves and Automatic Gas Shutoff Devices for Hot Water
Supply Systems, ANSI Z21.22. This valve must be marked
with a maximum set pressure not to exceed the marked
maximum working pressure of the water heater. Install
the valve into an opening provided and marked for this
purpose in the water heater, and orient it or provide tubing
so that any discharge from the valve exits only within 6
inches above, or at any distance below, the structural floor,
and does not contact any live electrical part. The discharge
opening must not be blocked or reduced in size under any
circumstances.
!
Material losses
Only operate the appliance when the DHW tank has been
filled.
!
Material losses
If you disconnect the appliance from the power supply, it is
no longer protected against frost.
f Do not interrupt the power supply to the appliance.
!
Material losses
Never cover this appliance. Covering the air intake or air
discharge leads to a reduced air supply. If the air supply is
restricted, the operational reliability of the appliance cannot
be guaranteed.
!
Material losses
Heating liquids other than potable water is not permitted.
3. Register your product
Note:
You must register this product within 90 days of purchase
on our web site in order to activate the standard warran-
ty or to be eligible for the extended warranty. Go to our
web site at www.stiebel-eltron-usa.com and click on
register your product.
Before beginning the registration process, we suggest that you
gather the necessary information which will be as follows:
1 Serial number on the type plate (the type plate label is located
at the top left of the unit when facing the air outlet)
Type, Example: WPL A2W 15 Premium
Number listed after “Nr.”
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
Installation Date
If you have any questions concerning the registration process or
warranty options, please contact Stiebel Eltron USA directly at
800.582.8423.
4. Appliance description
4.1 Properties
The appliance is an air source heat pump that operates as a heat-
ing heat pump for outdoor installation. Heat is extracted from the
outdoor air at a low temperature level, and is then transferred to
the heating water at a higher temperature. The heating water can
be heated up to a flow temperature of 149°F (65°C).
The appliance is equipped with an electric emergency/booster heat-
er (NHZ). To ensure heating operation and the provision of high
DHW temperatures, the electric emergency/booster heater is acti-
vated as an emergency heater if the dual mode point is undershot in
mono mode operation. If the same thing happens in mono energetic
operation, the electric emergency/booster heater is activated as a
booster heater.
This appliance has further operational characteristics:
- Suitable for underfloor and radiator heating systems.
- Preferred for low temperature heating systems.
- Extracts heat from the outdoor air even at outside tempera-
tures of -4°F (-20 °C).
- Corrosion-protected, external casing made from hot-dipped
galvanized sheet steel plus powder coated finish.
- Comprises all components and safety equipment required for
operation.

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- Filled with non-combustible safety refrigerant.
- The product is delivered without a cord.
Note
For centralized control of the heating system, you would
need the WPM heat pump manager.
4.2 Function
4.2.1 Heating
Heat is extracted from the outdoor air via the heat exchanger (evapo-
rator) on the air side. The evaporated refrigerant is compressed by a
compressor. This process requires electrical energy. At this point, the
refrigerant is at a higher temperature and pressure level. A further
heat exchanger (condenser) transfers the heat to the heating circuit.
The refrigerant then passes an electronically controlled expansion
valve, expands again, and the cycle restarts from the beginning.
If the ambient air temperature drops below 45°F (7°C), the moisture
of the air freezes on the evaporator fins and hoarfrost builds up.
The amount of hoarfrost build up depends on the relative humidity
of the air, and is automatically defrosted from time to time. Water
created by this defrosting process collects in the heated defrost pan
and is drained off.
!
Material losses
It is strongly recommended to install a buffer tank. The
buffer tank acts like an air separator, and a proper flow
rate is provided to avoid high pressure failure. During the
defrost cycle, the fan is switched off and the heat pump
circuit is reversed. The heat required for defrosting is drawn
from the buffer tank.
The heat pump automatically reverts to heating mode at the end of
the defrost cycle.
!
Material losses
In dual mode operation, return water from the second heat
generator may flow through the heat pump. Please note
that the return temperature must be no higher than 140°F
(60 °C).
4.2.2 Cooling
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
f Observe the application limits (see chapter "Specifica-
tion/ Data table").
!
Material losses
In cooling mode, condensate can form when the dew point
temperature is undershot.
f Take suitable measures to prevent the formation of
condensate.
Rooms are cooled by reversing the heat pump circuit. Heat is ex-
tracted from the heating water and the evaporator transfers this
heat to the outdoor air.
Area cooling and fan cooling require the installation of a remote
control unit (FET) in a reference room to capture the relative hu-
midity and the room temperature as part of dew point monitoring.
With fan cooling, it is also necessary to install a buffer tank.
Heat pump application limit
The heat pump is switched off if the ambient temperature is below
-4°F (-20 °C) in heating mode, or the selected lower application limit
for cooling (COOLING LIMIT parameter). The appliance is intended to
be used at an altitude of up to 6,561 ft (2000 m).
5. Settings
The system is operated exclusively via the WPM heat pump manager.
If the Heat pump is delivered with a system tank HSBC Integral, the
WPM is integrated in the indoor system tank assembly, and the WPM
is configured with default parameter setting for the complete system.
If the heat pump is delivered without a HSBC integral system tank a
SD card is delivered with the WPM for initial setup.
SD card default Parameter setting:
Heating curve default value for low energy application: 0.6 (10 °F
[-12.2 °C] ambient temperature means 113 °F [45°C] leaving water
temperature)
DHW temperature setting default value is 140 °F (60 °C)
Summer mode for cooling is activated at 78 °F (26 °C) ambient air
temperature
Adjusted Heating curve for lower building standard: 1.0 (-4 °F [-20°C]
ambient temperature means 149°F [45°C] leaving water tempera-
ture)
For cooling application a FET (remote control) is required.
The FET need to be installed in a reference room of the building to
detect the room temperature.
If a FET is installed the set point value for the leaving water tem-
perature of the heat pump is controlled using the room temperature
sensor information. The room temperature sensor is integrated in-
side the FET.
f To adjust the default settings of the WPM, please observe the
instructions for the WPM unit.

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6. Maintenance and care
!Material losses
Maintenance work, such as checking the electrical safety,
may only be carried out by a qualified contractor.
A damp cloth is sufficient for cleaning all plastic and sheet metal
parts. Never use abrasive or corrosive cleaning agents.
Regularly check the condensate drain (visual inspection). Remove
any contaminants and blockages immediately.
1.
2.
1
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1 Inspection port
!Material losses
Keep the air discharge and intake apertures free from snow
and leaves.
Remove any leaves or other foreign bodies from the evaporator fins
periodically.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor as
required (to restore the system to the ideal condition).
7. Troubleshooting
TļĒù¼ă |şń¼ ZĒùşŒêĒĉ
The heat pump is
not operating.
The WPM is not installed and/
or the ambient air temperature
sensor is not installed.
Activate the WPM and check
the installation of the ambi-
ent air temperature sensor.
It need to be placed on the
northern side of the building
not affected by solar radi-
ation.
Water is leaking
from the appli-
ance.
The condensate drain may be
blocked.
Clean the condensate drain
as described in "Mainte-
nance and care".
The heater gets
warm, but the
rooms are not
heated to the
required tempera-
ture.
The dual mode temperature is
set too low.
Increase the dual mode tem-
perature to e.g. 32°F (0°C).
TļĒù¼ă |şń¼ ZĒùşŒêĒĉ
The heater gets
warm, but the
rooms are not
heated to the
required tempera-
ture.
The building is new construc-
tion, and is in the screed drying
phase.
Increase the dual mode
temperature to 41°F (+5°C).
After 1 to 2 years the dual
mode temperature can be
reset to e.g. 27 °F (-3°C).
Condensate is
collecting on the
outside of the ap-
pliance.
The heat pump extracts heat
from the outdoor air in order
to heat the building. This can
cause the humidity in the
outdoor air to accumulate as
dew or frost on the cooled
heat pump casing. This is not
a defect.
The fan runs when
the compressor is
switched off.
At outside temperatures below
50 °F (10°C), the fan is regularly
started at the lowest speed
when the compressor is idle.
This prevents the evaporator
and fan from freezing or icing
up due to water draining off. At
temperatures above the freez-
ing point, the time between
two defrost cycles is increased,
thereby improving overall ef-
ficiency.
The appliance
produces rhythmic
scraping or grind-
ing noises.
Ice has formed on the air grille,
on the fan blades or in the air
routing.
Call your qualified contrac-
tor (see chapter "Installa-
tion/ Troubleshooting/ Fan
noise").
Note
Even when the condensate has been drained correctly, it
is not unusual for water to drip from the appliance onto
the floor.
If you cannot solve the problem, contact your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate. The type plate is located at the top left-hand side of
the casing, when facing the air outlet. Please contact Stiebel Eltron
technical support at (800)-582-8423 or (413)-247-3380.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26_03_01_1736
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8. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
8.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
8.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
The appliance is tested according to:
- IEC 61000-3-11
- UL 60335-2-40:2017 Ed.2
- UL 60335-1:2016 Ed.6
- CSA C 22.2 60335-2-40 : 2012 Ed.1+U1
- CAN/CSA E 60335-1/4E issued 2003/04/01 Ed.4
- AHRI Standard 550/590 (I-P)-201
- Energy star tested according to AHRI 550/590 2018
9. Appliance description
The appliance offers frost protection for the water driven pipe con-
nection tubing. The integral frost protection circuit starts the circu-
lation pump in the heat pump circuit automatically at a condenser
temperature of 46 °F (8 °C), and thereby ensures circulation in all
water-carrying sections. If the temperature inside the buffer tank
drops, the heat pump starts automatically no later than when the
temperature falls below 41°F (+5 °C).
Nevertheless, a 25% glycol water mixture is recommended to protect
against frost damage during a power outage. Polypropylene glycol is
strongly recommended to avoid corrosion issues. The Polypropylene
concentration should be not less than 25%.
9.1 Accessories
9.1.1 Required accessories
- WPM heat pump manager
9.1.2 Additional accessories
- FET remote control
- FE7 remote control
- HZB 1 ribbon heater
- HZB 2 ribbon heater
- SK 1 T-support
- AS-WP 2 connection set, item no. 203247
10. Preparation
!
D0000060163
The appliance is designed for siting in front of a wall. Observe the
minimum clearances. If the appliance is installed in an open space
or on a roof, protect the air intake side. Do this by erecting a wall to
shield it against the wind.
10.1 Sound emissions
The appliance is louder on the air intake and air discharge sides
than on the two enclosed sides. Take the following information into
account when selecting the installation location.
Note
For details regarding the sound power level, see chapter
"Specification / Data table".
- Lawn areas and shrubs help reduce the spread of noise.
- Noise propagation can also be reduced through dense pali-
sades or similar.
f Ensure that the entire appliance frame is in full contact with the
substrate. Uneven substrates can increase sound emissions.
f Ensure that the air intake direction is the same as the dominant
wind direction. Air should not be drawn in against the wind.
f Ensure that the air intake and air discharge are never directed
towards noise-sensitive rooms of the house, e.g.bedrooms, or
neighboring houses.
f Avoid installation on large, echoing floor areas, e.g.tiled
floors.
f Avoid installation between reflective building walls. Reflecting
building walls can increase the noise level.

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10.2 Minimum clearances
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f Maintain the minimum clearances to ensure trouble-free oper-
ation of the appliance and facilitate maintenance work.
91_00_00_0036
f Never install the appliance in a recess. Two sides of the appli-
ance must remain exposed.
!
Material losses
Please note that both the flow of outdoor air into the appli-
ance, and the flow of exhaust air from the appliance must
be unimpeded.
If the air intake and discharge of the appliance are ob-
structed by surrounding objects, this may cause a thermal
short circuit.
10.2.1 Minimum clearances with cascades
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
D0000078118
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
D0000078119

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 
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


D0000078120
3

1 Main wind direction
2 Air discharge
3 Wall or wind protection
10.3 Installation near ocean/salt water
1
3
4
2
>1640 ft
(>500 m)
D0000088568-ca
1 Main wind direction
2 Building, wall or windbreak
3WPLunit
4Airoutlet
fMake sure that the air inlet direction is the same as the main
wind direction. If the main wind direction is from the sea (sa-
linity >2%), keep a minimum distance of at least 1640ft (500m)
from the ocean.
10.4 Preparing the installation location
!WARNING Injury
The discharged cold air can cause condensation to be
formed in the vicinity of the air outlet.
fEnsure that no risk of slipping due to wet conditions
or ice formation occurs on adjacent footpaths and
driveways at low temperatures.
fObserve chapter "Sound emissions".
fEnsure that the appliance is accessible from all sides.
fEnsure that the substrate is level, even, solid and permanent.
fProvide a recess (space) in the base to enable supply lines to be
routed into the appliance from below.
!Material losses
fEnsure that all electric cables, connections, and con-
duit are placed and secured in such a way to keep
them free of damage during lawn cutting or landscap-
ing operations.
10.5 Installing the supply lines
The supply lines are all electric cables plus the flow and return lines.
- To facilitate connection to the appliance, we recommend using
flexible supply lines in the case of outdoor installation.
fAlso protect all supply lines against humidity, damage and UV
radiation by means of a conduit.
fUse only weatherproof cables, e.g. NYY.
fProtect the flow and return lines against frost with sufficient
thermal insulation. The thermal insulation must be at least
twice as thick as the diameter of the pipe. Provide thermal in-
sulation in accordance with applicable regulations.
fProtect all pipe fixings and external wall ducts with anti-vibra-
tion insulation.
Note
When routing the condensate hose, observe chapter "In-
stallation/ Condensate drain".
10.6 Siting
fWhen siting the appliance, observe the air discharge direction.
fTo avoid mold buildup, make sure that the appliance does not
blow cold air directly towards building structures.
fPosition the appliance on the prepared substrate or on a suit-
able support.

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10.6.1 Siting on foundations
Note
Allow the conduits for the supply lines to protrude slightly
above the foundations. Ensure that no water can enter the
conduits.
Foundations with recess (WPL15A2W Premium)
29 ½Ǝ
(750)
51 ǩƎ
(1300)
4Ǝ
(100)
4Ǝ
(410)
7 ǬƎ
(200)
3Ǝ
(75)
5 ½Ǝ
(140)
4
5
1
3
2
D0000034133
1 Air intake
2 Air discharge
3 Main wind direction
4 Supply line recess
5 Condensate drain recess, minimum diameter 2¾˝ (70mm)
f Ensure that the foundations offer the necessary recess.
Foundations with recess (WPL25A2W Premium)
59Ǝ
(1500)
4
5
1
3
2
7 ǬƎ
(200)
5 ½Ǝ
(140)
3Ǝ
(75)
29 ½
Ǝ
(750) 4
Ǝ
(100)
4Ǝ
(410)
D0000028298
1 Air intake
2 Air discharge
3 Main wind direction
4 Supply line recess
5 Condensate drain recess, minimum diameter 2¾˝ (70mm)
f Ensure that the foundations offer the necessary recess.
Installation on foundations
Note
Installation directly on foundations is not recommended in
climates where snow buildup is a concern. Excessive snow
buildup may block the air intake of the WPL and interrupt
normal operation. If installing in such a climate, consider
one of the alternative installation options presented in this
manual.
4
12
5
AB
C
3
D0000028297
A 4˝ (100 mm)
B 11¾˝ (300 mm)
C Depth of frost line
1 Heating flow
2 Heating return
3 Condensate drain conduit
4 Foundation
5 Gravel bed
Note
To secure the appliance against toppling over, it can also
be fixed to the foundations with screws.
f Use the accessories with which the appliance was se-
cured to the transport pallet.

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D0000064201
fHook two brackets respectively into the lateral slots on the
front and back. Ensure you are using the correct brackets for
the left and right hand slots respectively.
fPosition the brackets so that the groove on the bracket is
hooked into the appliance.
fSecure the appliance to the foundations using the brackets and
suitable rawl plugs and screws. Do not use the screws with
which the appliance was secured to the transport pallet.
T-support SK1
Note
fInstall a ribbon heater when mounting on the wall
bracket or T-support (see chapter "Electrical connec-
tion/ Ribbon heater").
A
B
8
5
7
3
4
2
1
6
9
10
D0000050006
A Depth of frost line
B 11 ¾˝ (300 mm)
1Heatingflow
2 Heating return
3 Conduit for supply lines
4 Foundation
5T-support
6 Gravel bed
7 Condensate drain conduit
8 Condensate drain
9 Ribbon heater
10 Cover
fObserve the structural limits of the T-support used.
fSee the dimensioned connection drawing for the correct spac-
ing between holes (see chapter "Specification/ Dimensions and
connections").
10.7 WPM heat pump manager
A WPM heat pump manager is required to operate the appliance.
This controls the entire heating system. If the heat pump is installed
with the indoor HSBC Integral system tank, a WPM is included with
preset parameters for easy initial setup.
fObserve the WPM installation instructions during installation.
10.8 Buffer tank
!Material losses
A buffer tank with diffusion-proof insulation is essential to
enable cooling by means of fan convectors. The emergency/
booster heater must be connected.
We recommend the use of a buffer tank to ensure trouble-free ap-
pliance operation.
The buffer tank provides hydraulic separation of the volume flows
in the heat pump circuit and heating circuit, and also serves as an
energy source for defrosting.
10.9 Preparing the electrical installation
WARNING Electrocution
Carry out all electrical connection and installation work in
accordance with national and regional regulations.
WARNING Electrocution
The connection to the power supply must be in the form of
a permanent connection. Ensure the appliance can be sep-
arated from the power supply by an isolator that discon-
nects all poles with at least 3mm contact separation. This
requirement can be met by contactors, isolators, fuses, etc.
!Material losses
The specified voltage must match the mains voltage. Ob-
serve the type plate.
!Material losses
Provide separate fuses/MCBs for the three power circuits,
i.e. those of the appliance, the control unit and the elec-
tricemergency/booster heater.
fUse cables with the relevant cross-sections. Carry out the field
wiring according to NEC. Use SJT type cable for outdoor appli-
cations. The cable need to be UV and oil resistant.

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BŎÏşń¼
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ńńêÖĉă¼ĉŒ |ù¼ļĒńńéń¼ŒêĒĉ
1x B 20 A Compressor
(1-phase)
WPL15A2W Premium
AWG 10
1x B 35A Compressor
(1-phase)
WPL25A2W Premium
AWG 8
1x B 30 A Electric emergency/
booster heater
WPL15A2W Premium
WPL25A2W Premium
AWG 10
1x B 15 A Control unit AWG 16
The electrical data can be found in the chapter "Specification". A
shielded 4-wire 18 AWG cable is required for the data bus connec-
tion.
Note
The appliance includes an inverter for the variable speed
compressor. In the event of a fault, inverters can cause DC
residual currents. If RCDs are provided, they must be type
B AC/DC-sensitive.
A DC residual current can block type A RCDs.
f Ensure that the appliance power supply is disconnect-
ed from the distribution board.
11. Installation
Note
The device is designed in such a way that it can be posi-
tioned and connected without removing the cover or side
panels.
11.1 Transport
f When transporting the appliance, be aware of its center of
gravity.
- The center of gravity is in the area where the compressor is
located.
f Protect the appliance against heavy impact during transport.
f Use the recessed grips provided at the sides.
D0000071298
- If the appliance needs to be tilted during transport, this must
only be for a short time and it must only be tilted on one of its
longitudinal sides. When transporting the appliance, ensure
the compressor is on the upper appliance side.
- The longer the appliance is tilted, the greater the distribution of
refrigerant oil inside the system.
f Wait approximately 30minutes before starting the appliance
after it has been tilted.
11.2 Heating water connection
!
Material losses
The heating system to which the heat pump is connected
must be installed by a qualified contractor in accordance
with the water installation drawings that are part of the
technical guide.
To facilitate connection to the heating system, push-fit connectors
are enclosed with the appliance (see chapter "Fitting the push-fit
connectors").
Use the 1 inch copper tubes delivered with the heat pump. They are
expanded on the installation side for soldering.
The non-expanded end of the tube needs to fit in the push-fit con-
nector.
For soldering, release the copper tubes out of the push fit connector.
f Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies, such as welding
pearls, rust, sand or sealant can impair the operational reli-
ability of the heat pump.
f Connect the heat pump on the heating side. Check for
tightness.
f Make sure that the tube connections are correct: the leaving
water tube (hot) is on the right-hand side, and the incoming
(cold) is on the left-hand side.
f Provide thermal insulation in accordance with applicable
regulations.
f When sizing the heating circuit, observe the internal pressure
differential (see chapter "Specification/ Data table").
11.3 Flow and return connection
!
Material losses
In cooling mode, condensate can form when the dew point
temperature is undershot.
f Take suitable measures to prevent the formation of
condensate.

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26_03_01_1871
2
1
3
4
1 Leaving water port (hot)
2 Heating return (cold)
3Drain
4Purgevalve
fConnect the heat pump to the heating circuit. Check for
tightness.
11.4 Fitting the push-fit connectors
Note
The plastic push-fit connectors are not suitable for instal-
lation in the DHW line or the solar circuit.
fInstall the push-fit connectors only in the heating cir-
cuit.
!Material losses
Tighten the screw cap of the push-fit connector by hand.
Never use a tool.
!Material losses
To ensure the push-fit connector is held securely, pipes
with a surface hardness>225HV (e.g. stainless steel) must
have a groove.
fUsing a pipe cutter, cut a groove (depth ap-
prox.0.1mm) at a defined distance from the end of
the pipe.
- Pipe diameter 7/8˝: 11/16˝±1/32˝ (22mm: 17 ± 0.5mm)
- Pipe diameter 11/8˝: 13/16˝±1/32˝ (28mm: 21 ± 0.5mm)
How the push-fit connectors work
The push-fit connectors are equipped with a retainer with stainless
steel serrations and an O-ring for sealing. The push-fit connectors
also have a "twist and secure" function. Simply turning the screw cap
by hand will secure the pipe in the connector and push the O-ring
against the pipe to seal it.
Making the push-fit connection
The connector must be in its relaxed position before the pipe is
inserted. In this position, there is a small gap between the screw
cap and main body.
D0000088519
1234
1Retainer
2Screwcap
3 Gap between screw cap and main body
4 Main body
D0000088520
Pipe Ø 11/8˝ (28 mm)
Depth of insertion A max. 1¾˝ (44mm)
!Material losses
Pipe ends must be de-burred.
fAlways use a pipe cutter to trim pipes.
fPush the pipe past the O-ring into the push-fit connector until
it reaches the prescribed insertion depth.
fTighten the screw cap by hand against main body as far as it
will go. This secures the push-fit connection.
Undoing the push-fit connection
If the push-fit connectors later need to be undone, proceed as fol-
lows:
fTurn the screw cap anti-clockwise until there is a narrow gap of
approx. 1/16˝ (2mm). Press the retainer back with your fingers
and hold on to it.
fPull out the inserted pipe.
D0000088521

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11.5 Oxygen diffusion
!Material losses
Do not use open vented heating systems. Use oxygen diffu-
sion-proof pipes in underfloor heating systems with plastic
pipework.
In underfloor heating systems with plastic pipes that are permeable
to oxygen and in open vented heating systems, oxygen diffusion may
lead to corrosion on the steel components of the heating system (e.g.
on the indirect coil of the DHW tank, on buffer tanks, steel radiators
or steel pipes).
fWith heating systems that are permeable to oxygen, separate
the heating system between the heating circuit and the buffer
tank.
!Material losses
The products of corrosion (e.g. rusty sludge) can settle
in the heating system components, which may result in a
lower output or fault shutdowns due to reduced cross-sec-
tions.
11.6 Filling the heating system
Carry out a fill water analysis before filling the system. This analy-
sis may, for example, be requested from the relevant water supply
utility.
Use propylene glycol for boiler applications with a minimum con-
centration of 25% for frost protection.
Do not use automotive glycol. Automotive glycol causes deposits in
the heat exchanger and may destroy the heat exchanger.
The glycol concentration depends on the coldest temperature locally.
&ùźĒù Ēĉ¼ĉŒļ|ŒêĒĉ %ļĒńŒ ĤļĒŒ¼ŒêĒĉ Œ¼ăĤ¼ļ|Œşļ¼
30% concentration 8°F (-13.3 °C)
40% concentration -7 °F (-21.7°C)
50% concentration -29 °F (-33.9°C)
The water system must contain a mixture of inhibited glycol and
water with thermal protection sufficient for the coldest expected
temperature for the installation. The inhibitor level can degrade
over time, and may need to be adjusted periodically. The inhibitor
is essential to prevent the glycol from accelerating corrosion of
metal components in the system. The glycol and inhibitor levels
must be checked regularly (no less than once annually).
!Material losses
To avoid damage as a result of scaling, it may be necessary
to soften or desalinate the fill water. The fill water limits
specified in chapter "Specification/ Data table" must always
be observed.
fRecheck these limits 8-12weeks after commissioning,
every time the system is topped up and during the
annual service.
Note
With a conductivity >1000μS/cm, desalination treatment is
recommended in order to avoid corrosion.
Note
If you treat the fill water with inhibitors or additives, the
same limits apply as for desalination.
Note
Suitable appliances for water softening and desalinating,
as well as for filling and flushing heating systems, can be
obtained from trade suppliers.
fFill the heating system via the drain (see chapter "Specifica-
tion/ Dimensions and connections").
fAdd water to the system as needed to raise the pressure to 29
PSIG (verify that all system components are suitable for this
pressure). Verify that the pressure remains constant for at least
one hour. Locate and correct any leaks.
11.6.1 Venting the heating system
fBefore you fill the system, open the high point purge valve to
vent the air during filling.
fAlso open the purge valve on the heat pump.
D000035306
1
1Purgevalve
fVent the pipework by activating the purge valve.
11.7 Minimum flow rate
The minimum flow rate and the defrost energy must always be
assured (see chapter "Specification/ Data table").

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11.8 Setting the flow rate on the heating side
!
Material losses
Never operate the system without a buffer tank to ensure
proper flow rate for the heating system. The buffer tank
ensures there is always enough thermal energy to defrost
the evaporator in time. If a buffer tank is not used, the
condenser may freeze under defrost mode and lead to a
complete loss of refrigerant.
The setting is made in heat pump mode. In order to do this, firstly
make the following settings:
f Temporarily remove the fuse from the electric emergency/
booster heater to isolate the emergency/booster heater from
the power supply. Alternatively, switch OFF the second heat
generator.
f Operate the appliance in heating mode.
The flow rate is set automatically via the self-regulating system (see
menu "COMMISSIONING/ HEATING/ SPREAD CONTROL/ STANDBY
PUMP RATE" in the heat pump manager).
In heat pump mode, a fixed temperature rise between the heat
pump flow and return is set (see menu "COMMISSIONING/ HEATING/
SPREAD CONTROL" in the heat pump manager).
Checking the flow rate
f Set parameter STANDBY PUMP RATE to 100%.
f Set buffer operation to OFF.
f The current flow rate can be called up in the menu "INFO/
INFO HEAT PUMP/ PROCESS DATA" under "WP WATER FLOW
RATE".
f Compare the value with the specification (see chapter "Specifi-
cation/ Data table").
f If the specified flow rate is not met, take suitable measures to
increase the flow rate up to the minimum required value.
f Reset the parameters to their original values
!
Material losses
A buffer tank with diffusion-proof insulation is essential to
enable cooling by means of fan convectors.
BêĉêăşăÏùĒŷ
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ĒăĤĒńꌼĤêĤ¼ŷĒļ÷ŗŎÔķŎ
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<¼|®ļĒĒă
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Cşă¼ļĒÏêļé
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ÏùĒĒļ|ļ¼|
Cşă¼ļĒÏêļé
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ÖĤäĦùŎäħ Ö|ùĦùħ ÏŒ²ĦăŞħ #ŨŹŨÏŒ ÏŒ²ĦăŞħ #ŨŹŨÏŒ
WPL 15 A2W 185 gph (700 l/h) 4.2 gal (16 l) 226 ft2(21 m2) 3 x 230 226 ft2(21 m2) 2 x 230
WPL 25 A2W 264 gph (1000 l/h) 7.7 gal (29 l) 301 ft2(28 m2) 4 x 230 344 ft2(32 m2) 3 x 230
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ä¼|Œ¼ļ
WPL 15 A2W Yes 26.4 gal (100 l) 26.4 gal (100 l) Yes
WPL 25 A2W Yes 26.4 gal (100 l) 26.4 gal (100 l) Yes
f Install the open heating circuit(s) in the lead room (room where
the external programming unit of the heat pump control unit
is installed, such as in the living room). The individual room
can then be controlled either with the external programming
unit or indirectly by adjusting the heating curve or the room
influence.
f Fully open the heating circuit(s) in the lead room.
f Close all other heating circuits.
f If an overflow valve has been installed in the heating system,
fully close this overflow valve in order to determine the mini-
mum flow rate.
In combination with a hydraulic module, tank and hydraulic module
or integral tank:
f Under menu item "COMMISSIONING/ HEATING" the parameter
"HEATING CIRC PUMP RATE" (heating circuit pump rate) such
that the minimum flow rate required for system operation is
assured (see chapter "Specification/ Data table").
If the appliance is operated on its own with a WPM:
f Set the heating circuit pump so that the minimum flow rate re-
quired to operate the system is safeguarded.
The current flow rate can be called up in the menu "INFO/ HEAT
PUMP INFO/ PROCESS DATA" under "WP WATER FLOW RATE".
11.8.2 Minimum flow rate for systems with a buffer tank
When using a buffer tank, in menu "SETTINGS/ HEATING/ STAN-
DARD SETTINGS", set parameter "BUFFER OPERATION" to "ON".
In combination with a hydraulic module, tank and hydraulic module
or integral tank, and with spread control disabled:
f In menu "COMMISSIONING/ HEATING", set parameter "HEAT-
ING CIRC PUMP RATE" so that the nominal flow rate required
for system operation is assured (see chapter "Specification/
Data table").
If the appliance is operated on its own with a WPM:
f Set the buffer charging pump so that the nominal flow rate re-
quired for system operation is assured.
The current flow rate can be called up in the menu "INFO/ HEAT
PUMP INFO/ PROCESS DATA" under "WP WATER FLOW RATE".

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11.9 Condensate drain
A condensate drain connector is factory-fitted to the defrost pan to
enable any condensate to drain off.
26_03_01_1868
1
1 Condensate drain
fObserve chapter "Electrical connection/ Ribbon heater".
fIf the appliance is sited on foundations, the condensate drips
freely into the condensate drain pipe.
fIf the appliance is mounted on a bracket or T-support, attach a
condensate hose to the condensate drain.
fProtect the condensate hose against frost with sufficient ther-
mal insulation.
!Material losses
Ensure the condensate hose is not kinked. Route the hose
with a slope.
fAfter routing the condensate hose, check that the condensate
can drain correctly.
11.10 External second heat generator
For dual mode systems, always connect the heat pump into the
return of the second heat generator (e.g. oil boiler).
11.11 High limit safety cut-out for area heating system
!Material losses
In order to prevent excessively high flow temperatures in
the area heating system causing damage in the event of a
fault, install a high limit safety cut-out to limit the system
temperature.
12. Electrical connection
WARNING Electrocution
fBefore working on the appliance, isolate it from the
power supply at the control panel.
Note
The leakage current of this appliance can be >3.5mA.
The connection must only be made by a qualified contractor and in
accordance with these instructions.
You must have permission to connect the appliance from the relevant
power supply utility.
Note
Please observe the instructions for the heat pump manager.
The terminals are located in the terminal area of the appliance.
Follow the instructions in the chapter "Preparation/ Preparing the
electrical installation".
fFor all connections, use appropriate cables in accordance with
National Electric Code (NEC).
12.1 Access to the terminal area
D0000035356

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D0000035358
fPush the cover upwards.
D0000035363
12
1Strainrelief
2 Terminal area
fRoute cables and leads through the strain relief fittings.
If space behind the appliance is limited, the terminal area can be
folded out.
D0000035380
fUndo the screw on the terminal area.
D0000035382
fPivot the terminal area to the side.
D0000075146
fFix the terminal area in place with the locking mechanism.

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fConnect the electric emergency/booster heater if you want to
utilize the following appliance functions:
ĤĤùê|ĉ¼
ÏşĉŒêĒĉ
ÏϼŒ ĒÏ Œä¼ ¼ù¼Œļê ¼ă¼ļÖ¼ĉźŎĒĒńŒ¼ļ
ä¼|Œ¼ļ
Mono energetic op-
eration
If the dual mode point is undershot, the electric emergen-
cy/booster heater safeguards both the heating operation
and the provision of high DHW temperatures.
Emergency mode If the heat pump shuts down due to a fault, the heating
output is covered by the electric emergency/booster heat-
er.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <77 °F (<25°C), the electric
emergency/booster heater must provide the necessary
heat for screed drying.
With such low system temperatures, the heat for screed
drying must not be provided by the heat pump, otherwise
the frost protection of the appliance can no longer be
guaranteed during the defrost cycle.
When the heat-up program has ended, the electric emer-
gency/booster heater can be disconnected if it is not re-
quired for appliance operation.
Please note that during the heat-up program, emergency
mode is not available.
Disinfection mode The electric emergency/booster heater starts automati-
cally when disinfection mode is active. The DHW is then
regularly heated to 140 °F (60 °C) to protect it against the
growth of legionella bacteria.
12.2 WPL15/25A2W Premium
fConnect the cables according to the following diagram.
BUS
X2
L
H
T
„+“
X5 / DHC X3 / WP X4 / Steuerung
L2 L1L1 L2 L1 L2 L1
ON
-
ERR
L2
3,0 kW L1 L2 PE
3,2 kW L1 L2 PE
6,2 kW L1 L2 L1 L2 PE
L1/L2/PE~240/60
C 32A
L1/L2/PE~240/60
C 16A
L1/L2/PE~240/600
C 20A
D0000037825
1
1 Ground terminal for screening the LV lead
X2 Z|ϼŒź¼ŹŒļ|ùĒŷŶĒùŒ|Ö¼ĦeZħ
BUS High H
BUS Low L
BUS earth
BUS "+" (is not connected)
X3 ĒăĤļ¼ńńĒļ ĦêĉŶ¼ļŒ¼ļħ
L1, L2, GND
X4 ĒĉŒļĒù ŶĒùŒ|Ö¼
-
ON
ERR
Power supply: L1, L2, GND
X5 ù¼Œļê¼ă¼ļÖ¼ĉźŎĒĒńŒ¼ļä¼|Œ¼ļĦC+xħ
X2 Z|ϼŒź ¼ŹŒļ| ùĒŷ ŶĒùŒ|Ö¼ ĦeZħ
L1, L2, GND
Ēĉĉ¼Œ¼® ùĒ|® `¼ļăêĉ|ù |ńńêÖĉă¼ĉŒ
3.0kW L1 L2 GND
3.2kW L1 L2 GND
6.2kW L1 L2 L1 L2 GND
fGround the LV lead by inverting the screen over the cable
sheath and clamping it under the ground terminal.
fThen check that the strain relief fittings are working as
intended.
12.3 Closing the terminal area
D0000035356
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1 Serrated washer
2Screw
fSecure the cover with the screw and serrated washer.
fConnect the following components to the heat pump manager
in accordance with the technical guides:
- Circulation pump for the heat consumer side
- Outside temperature sensor
- Return sensor (only for operation with buffer tank)
12.4 Ribbon heater
A ribbon heater (see chapter "Installation/ Appliance description/
Accessories/ Further accessories") can be fitted to the condensate
pan and the condensate hose.
fInstall a ribbon heater when mounting on the wall bracket or
T-support.
When installing on foundations or the mounting bracket, we rec-
ommend installing a ribbon heater if the routing of the condensate
hose means it is at risk of frost or is fully exposed to the elements.

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Access to the terminal area
26_03_01_1544
fRemove the cover.
A.
1
D0000035975
1 Electrical connection for ribbon heater
fGuide the ribbon heater through the appliance.
D0000033168
fGuide the ribbon heater into the condensate drain pipe.
B.
D0000035976
fMake the electrical connection for the ribbon heater.
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Power supply: L1, L2, GND
Closing the terminal area
26_03_01_1867
fPosition the cover on the appliance.
fSecure the cover with the four screws.