STIEBEL ELTRON WPL 07 ACS classic Quick start guide

OPERATION AND INSTALLATION
Air source heat pump
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TABLE OF CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Other applicable documents ���������������������������������� 3
1.2 Safety instructions����������������������������������������������� 3
1.3 Other symbols in this documentation ����������������������� 4
1.4 Units of measurement ������������������������������������������ 4
1.5 Standardised output data �������������������������������������� 4
2. Safety����������������������������������������������������������4
2.1 Intended use������������������������������������������������������ 4
2.2 Safety instructions����������������������������������������������� 4
3. Appliance description ���������������������������������������5
3.1 Minimum software versions����������������������������������� 5
3.2 Properties ��������������������������������������������������������� 5
3.3 Function ����������������������������������������������������������� 5
4. Settings �������������������������������������������������������6
5. Maintenance and care ���������������������������������������6
6. Troubleshooting ����������������������������������������������6
INSTALLATION
7. Safety����������������������������������������������������������7
7.1 General safety instructions ������������������������������������ 7
7.2 Instructions, standards and regulations �������������������� 7
8. Appliance description ���������������������������������������7
8.1 Standard delivery������������������������������������������������ 7
8.2 Accessories�������������������������������������������������������� 7
9. Preparation ���������������������������������������������������7
9.1 Sound emissions������������������������������������������������� 7
9.2 Minimum clearances�������������������������������������������� 8
9.3 Preparing the installation location��������������������������� 8
9.4 Installing the supply lines������������������������������������� 11
9.5 WPM heat pump manager ������������������������������������ 11
9.6 Buffer cylinder �������������������������������������������������� 11
9.7 Preparing the electrical installation ������������������������ 11
10. Installation�������������������������������������������������� 12
10.1 Transport ��������������������������������������������������������� 12
10.2 Siting �������������������������������������������������������������� 12
10.3 Flow and return connection ���������������������������������� 12
10.4 Fitting the push-fit connectors������������������������������� 12
10.5 Heating water connection������������������������������������� 13
10.6 Oxygen diffusion������������������������������������������������ 13
10.7 Filling the heating system ������������������������������������ 14
10.8 External second heat generator ����������������������������� 14
10.9 High limit safety cut-out for area heating system�������� 14
11. Electrical connection��������������������������������������� 15
11.1 Terminal area���������������������������������������������������� 15
12. Commissioning ��������������������������������������������� 16
12.1 Checks before commissioning�������������������������������� 16
12.2 Ensuring a minimum flow rate ������������������������������ 16
13. Settings ����������������������������������������������������� 18
13.1 Heating curve adjustment ������������������������������������ 18
13.2 Reduced night mode (Silent mode) ������������������������� 19
13.3 Other settings ��������������������������������������������������� 19
14. Appliance handover���������������������������������������� 19
15. Shutting down the system �������������������������������� 19
15.1 Standby mode ��������������������������������������������������� 19
15.2 Power interruption ��������������������������������������������� 19
16. Maintenance ������������������������������������������������ 20
17. Troubleshooting �������������������������������������������� 20
17.1 Checking the IWS DIP switch settings ���������������������� 20
17.2 LEDs (IWS)�������������������������������������������������������� 21
17.3 Reset button ����������������������������������������������������� 22
17.4 Fan noise ��������������������������������������������������������� 22
18. Specification ������������������������������������������������ 23
18.1 Dimensions and connections ��������������������������������� 23
18.2 Wiring diagram ������������������������������������������������� 24
18.3 Application limit ������������������������������������������������ 26
18.4 Output diagrams WPL 07 ACS classic ����������������������� 27
18.5 Output diagrams WPL 09 ACS classic ����������������������� 28
18.6 Output diagrams WPL 13 ACS classic ����������������������� 29
18.7 Output diagrams WPL 17 ACS classic ����������������������� 31
18.8 Data table �������������������������������������������������������� 32
GUARANTEE
ENVIRONMENT AND RECYCLING

www.stiebel-eltron.com WPL ACS classic|3
SPECIAL INFORMATION | OPERATION
General information
SPECIAL INFORMATION
- 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. Cleaning and user maintenance
must not be carried out by children without
supervision.
- The connection to the power supply must be in
the form of a permanent connection. Ensure the
appliance can be separated from the power sup-
ply by an isolator that disconnects all poles with
at least 3mm contact separation.
- Maintain the minimum clearances to ensure trou-
ble-free operation of the appliance and facilitate
maintenance work.
- Maintenance work, such as checking the electri-
cal safety, must only be carried out by a qualified
contractor.
- We recommend a 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 intended condition).
- Following disconnection from the power supply,
parts of the appliance may remain energised
for 2minutes until the inverter capacitors have
discharged.
- Never interrupt the heat pump power supply,
even outside of the heating season. Otherwise,
system frost protection is not guaranteed.
- If the heat pump is completely switched OFF and
there is a risk of frost, drain the system on the
water side.
OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for appliance users and qualified contractors.
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on these instructions to a new user if required.
1.1 Other applicable documents
Instructions for the WPM heat pump manager
Operating and installation instructions for connected
indoor unit
Operating and installation instructions for mounting
bracket used
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
Symbol Type of risk
Injury
Electrocution
1.2.3 Keywords
KEYWORD Meaning
DANGER Failure to observe this information will result in serious
injury 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-seri-
ous or minor injury.
!

OPERATION
Safety
4|WPL ACS classic www.stiebel-eltron.com
1.3 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
f Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal 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 mm unless stated oth-
erwise.
1.5 Standardised output data
Information on determining and interpreting the specified stand-
ardised output data.
1.5.1 EN 14511
The output data specifically mentioned in text, diagrams and
technical datasheets has been calculated according to the test
conditions of the standard shown in the heading of this section.
However, there is a deviation from this norm in the output data for
air/water inverter heat pumps at source temperatures of > -7°C
as this concerns partial load values. The associated percentage
weighting in the partial load range can be found in EN14825 and
EHPA quality label regulations.
Generally, the test conditions stated above will not fully match the
conditions found at the installation site of the system user.
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.
Additional factors that have an influence on the test values are the
measuring equipment, the system configuration, the age of the
system and the flow rates.
Confirmation of the specified output data can only be obtained if
the test conducted for this purpose is also performed in accord-
ance with the test conditions defined in the first paragraph of this
section.
2. Safety
2.1 Intended use
The appliance is designed for room heating and cooling within
the application limits given in the specification.
The appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in non-do-
mestic environments, e.g.in small businesses, as long as it is
used in the same way.
Any other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions and of instructions for any
accessories 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 applicable regulations during installation and
commissioning.
- The appliance should only be operated once it is fully in-
stalled 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 men-
tal 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 appliance. Cleaning and user maintenance must
not be carried out by children without supervision.
!
WARNING Injury
f For safety reasons, only operate the appliance with
the casing closed.
!

OPERATION
Appliance description
www.stiebel-eltron.com WPL ACS classic|5
3. Appliance description
3.1 Minimum software versions
The following minimum software versions are necessary for op-
eration of the heat pump:
WPL07ACSclassic| WPL09ACSclassic| WPL17ACSclassic
- WPM: 390.09
- MFG: V.14
- FES: 417.05
WPL 13 ACS classic.
- WPM: 390.12
- MFG: V.14
- FES: 417.07
3.2 Properties
This appliance is an air source heat pump designed for outdoor
installation. Heat is extracted from the outdoor air at a low tem-
perature 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 60 °C.
This appliance has further operational characteristics:
- Suitable for underfloor heating systems.
- Preferred for low temperature heating systems.
- Extracts heat from the outdoor air even at outside tempera-
tures of -20 °C.
- Corrosion-protected, external casing made from hot-dipped
galvanised sheet steel plus stove-enamelled finish.
- Filled with non-combustible safety refrigerant.
Note
The appliance may only be used in conjunction with the
following products:
- Hydraulic module HM(S) (Trend)
- Hydraulic module HMH
- Cylinder and hydraulic module HSBB200(S)
- Integral cylinder HSBC200(S) –
3.3 Function
3.3.1 Heating
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The evaporated refrigerant is com-
pressed by a compressor. This process requires electrical ener-
gy. At this point, the refrigerant is at a higher temperature level.
A further heat exchanger (condenser) transfers the heat to the
heating circuit. The refrigerant then expands again and the cycle
restarts from the beginning.
At air temperatures below approx. + 7 °C, the humidity in the
air condenses as hoarfrost on the evaporator fins. This hoarfrost
is automatically defrosted. The resulting water flows out of the
appliance via the free condensate drain and seeps away into the
gravel bed.
!
Material losses
During the defrost cycle, the fan is switched OFF and the
heat pump circuit is reversed. The heat required for de-
frosting is drawn from the buffer cylinder. For operation
without a buffer cylinder, observe chapter "Menu/ Menu
description/ SETTINGS/ HEATING/ STANDARD SETTING/
BUFFER OPERATION" in the WPM installation instructions.
This prevents damage to the heat pump as a result of
unfavourable conditions.
Note
In winter, icicles can form on the bottom of the conden-
sate drain. This does not interfere with the operation
of the appliance, provided the condensate can drain off
unimpeded.
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
60°C.
3.3.2 Cooling
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
f Observe the application limits (see chapter "Specifi-
cation/ 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.
Note
The HM(S) (Trend) is equipped for both area and fan
cooling.
The HSBB 200 (S) and HSBC 200 (S) can provide area
cooling.
Rooms are cooled by reversing the heat pump circuit. Heat is
extracted from the heating water. The evaporator transfers this
heat to the outdoor air.
Area cooling requires the installation of the FET remote control
unit in a reference room to capture the relative humidity and the
room temperature as part of dew point monitoring.
Fan cooling requires the installation of the FE7/ FET remote con-
trol unit in a reference room to capture the room temperature. In
addition, a buffer cylinder needs to be installed.

OPERATION
Settings
6|WPL ACS classic www.stiebel-eltron.com
Heat pump application limit
The heat pump is switched off if the outside temperature falls
below the selected lower application limit for cooling (LIMITCOOL-
ING parameter).
4. Settings
The system is operated exclusively via the WPM heat pump man-
ager. The heat pump manager is installed in the products required
as accessories (see chapter “Installation/ Appliance description/
Accessories”).
f Please observe the instructions for the heat pump manager.
5. 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.
f Protect the appliance from dust and dirt during building
work.
!
Material losses
Keep the air discharge and intake apertures free from
snow and leaves.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor if
required (to return the system to its intended condition).
6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
remains cold.
No power at the appli-
ance.
Check the fuses/ MCBs in your
fuse box/ distribution board.
Replace the fuses/reset the MCBs
if required. Notify your qualified
contractor if the fuses/MCBs
blow/trip again after switching
the system back on.
The heater gets
warm, but the
rooms are not
heated to the
required temper-
ature.
The dual mode tempera-
ture is set too low.
Increase the dual mode tempera-
ture to e.g. 0°C.
The building is a new
build and is in the screed
drying phase.
Increase the dual mode tempera-
ture to +5°C.
After 1 to 2 years the dual mode
temperature can be reset to e.g.
-3°C.
Condensate
collects on the
outside of the
appliance and on
the air grille.
The heat pump is extract-
ing heat from the outdoor
air to heat the building.
This can cause the hu-
midity in the outdoor air
to accumulate as dew or
frost on the cooled heat
pump casing. This is not
a defect.
Fault Cause Remedy
The fan runs
when the
compressor is
switched OFF.
At outside temperatures
below 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 tempera-
tures above the freezing
point, the time between
two defrost cycles is in-
creased, thereby improv-
ing overall efficiency.
The appliance
produces rhyth-
mic scraping or
grinding noises.
Ice has formed on the air
grille, on the fan blades
or in the air routing.
Call your qualified contractor
(see chapter "Installation/ Trou-
bleshooting/ Fan noise").
If you cannot remedy the fault, 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 front top, on the
right or left-hand side of the casing.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26�03�01�1736
1
1 Number on the type plate

INSTALLATION
Safety
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INSTALLATION
7. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
WPL 07 ACS classic| WPL 09 ACS classic
The tested appliance conforms to IEC 61000-3-3.
WPL 13 ACS classic.| WPL 17 ACS classic
The tested appliance conforms to IEC 61000-3-12.
8. Appliance description
The appliance offers frost protection for the connection lines. The
integral frost protection circuit starts the circulation pump in the
heat pump circuit automatically at a condenser temperature of
8°C, and thereby ensures circulation in all water-carrying sec-
tions. When the temperature in the buffer cylinder falls to below
+5°C, the heat pump is automatically started subject to the out-
side temperature.
8.1 Standard delivery
The following are delivered with the appliance:
- Wiring diagram
8.2 Accessories
8.2.1 Required accessories
Note
If the appliance is used with the HMH hydraulic module, it
is not necessary to connect an electric emergency/auxil-
iary heater for some functions, as the 2nd heat generator
fulfils this function.
f Refer to the HMH hydraulic module operating and
installation instructions.
- T-support SK 2 or wall mounting support WK 1
- Hydraulic module HM(S) (Trend), Hydraulic module HMH, cyl-
inder and hydraulic module HSBB 200 (S) or integral cylinder
HSBC 200 (S)
8.2.2 Additional accessories
- Remote control for heating systems FET
- Remote control for heating systems FE7
- High limit safety cut-out for area heating system STB-FB
- Cover CH1
9. Preparation
!
D0000060163
The appliance is designed for installation on a T-support or wall
mounting bracket. Observe the minimum clearances. If the appli-
ance is installed in an open space, protect the air intake side. Do
this by erecting a wall to shield it against the wind. A gravel bed
is an essential requirement for both installation versions.
9.1 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.
- Sound propagation can also be reduced by installing closely
spaced palisade fencing around the appliance.
f Ensure that the air intake direction is the same as the main
wind direction. Air should not be blown out against the wind.
f Ensure that the air intake and air discharge are never direct-
ed towards noise-sensitive rooms of the house, e.g.bed-
rooms, or neighbouring houses.
f Avoid installation between reflective building walls. Reflect-
ing building walls can increase the noise level.

INSTALLATION
Preparation
8|WPL ACS classic www.stiebel-eltron.com
9.2 Minimum clearances
≥2000
≥500
≥200 ≥300
≥1000
≥800
D0000057581D0000096921
f Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
f Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
!
Material losses
Please note that both the flow of outdoor air into the
appliance, 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.
9.2.1 Installation in coastal areas
1
3
4
2
>500 m
D0000088568
1 Main wind direction
2 Building, wall or wind protection
3 appliance
4 Air discharge
f Ensure that the air intake direction is the same as the main
wind direction. If the main wind direction is from the sea (>
2% salinity), ensure that the installation is at least 500m
from the sea.
9.3 Preparing the installation location
f Observe chapter "Sound emissions".
f Ensure that the appliance is accessible from all sides.
9.3.1 Condensate drain
!
WARNING Injury
At temperatures below freezing point, ice may form.
f Do not allow the gravel bed or surrounding area to
slope downwards towards paths.
!
Material losses
The foundations of the building must have a damp proof
membrane.
Note
f Never use grit for the gravel bed.

INSTALLATION
Preparation
www.stiebel-eltron.com WPL ACS classic | 9
Example: Gravel bed under T-support SK 2
>800 100
300
a
D0000063484
1
1 Drainage pipe
Heat pump a
WPL 07 ACS classic 700
WPL 09 ACS classic 700
WPL 13 ACS classic 830
WPL 17 ACS classic 830
f Lay a drainage pipe under the appliance to drain moisture
away from the building.
f Create a gravel bed below the condensate drain of the appli-
ance.
Example: Gravel bed under wall mounting bracket WK 1
>800
≥300
a
b
D0000065666
1
1 Drainage pipe
Heat pump a b
WPL 07 ACS classic 900 865
WPL 09 ACS classic 900 865
WPL 13 ACS classic 1000 995
WPL 17 ACS classic 1000 995
f Lay a drainage pipe under the appliance to drain moisture
away from the building.
f Create a gravel bed below the condensate drain of the appli-
ance.

INSTALLATION
Preparation
10|WPL ACS classic www.stiebel-eltron.com
9.3.2 Siting
Example: T-support SK 2
B
C
A
1
3
2100100
D0000063486
1 Air intake side
2 Air discharge side
3 Main wind direction
Heat pump A B C
WPL 07 ACS classic 850 500 408
WPL 09 ACS classic 850 500 408
WPL 13 ACS classic 980 500 408
WPL 17 ACS classic 980 500 408
!
Material losses
The T-support may bend if the heat pump is subject to
any lateral load.
f Do not exert any pressure on the sides of the heat
pump.
f Observe the structural limits of the T-support used.
To cover the supply lines, you can install a cover hood.
Note
You can install the cover hood either vertically or hori-
zontally.
f Observe the installation instructions for the cover
hood.
200
358
200 190-400
D0000084661
200
300-400
20032
D0000084662
Example Wall mounting support WK 1
Note
To prevent disturbance due to structure-borne noise
transmission, never install the wall mounting bracket on
the external walls of living areas or bedrooms.
f Install the wall mounting bracket on a garage wall,
for example.
Note
Condensate drips from the appliance onto the floor.
f Observe the minimum clearance below the appli-
ance (see chapter "Preparations/ Minimum clear-
ances").
≥200
2
31
D0000057582
1 Heating flow
2 Heating return
3 Wall mounting bracket
f Observe the structural limits of the wall mounting bracket
used.
To cover the supply lines, you can install a cover hood.
f Observe the installation instructions for the cover hood.
200
95
200 190-400
D0000084663

INSTALLATION
Preparation
www.stiebel-eltron.com WPL ACS classic|11
9.4 Installing the supply lines
Note
f Do not route the heating flow and return pipes
through the gravel bed below the appliance.
The supply lines are all electric cables plus the heating flow and
return lines.
- To facilitate connection to the appliance, we recommend
using flexible supply lines in the case of outdoor installation.
f Use only weatherproof cables, e.g. NYY.
f Protect the flow and return lines against frost with sufficient
thermal insulation. Provide thermal insulation in accordance
with applicable regulations.
f Also protect all supply lines against humidity, damage and
UV radiation by means of a conduit.
f Protect all pipe fixings and external wall ducts with anti-vi-
bration insulation.
9.5 WPM heat pump manager
A WPM heat pump manager is required to operate the appliance.
This controls the entire heating system. The heat pump manager
is installed in the products defined as required accessories (see
chapter "Installation/ Appliance description/ Accessories").
9.6 Buffer cylinder
!
Material losses
A buffer cylinder with diffusion-proof insulation is essen-
tial to enable cooling by means of fan convectors.
Note
If cooling is provided via an area heating system, the
buffer cylinder is not required.
We recommend the use of a buffer cylinder to ensure trouble-free
appliance operation.
The buffer cylinder provides hydraulic separation of the volume
flows in the heat pump circuit and heating circuit, and also serves
as an energy source for defrosting.
f If operating without a buffer cylinder, observe the details in
chapter "Commissioning/ Ensuring a minimum flow rate".
Note
For operation without a buffer cylinder, we recommend
installing an electric emergency/auxiliary heater (NHZ).
There is an emergency/auxiliary heater in the products
required as accessories (see chapter “Installation/ Ap-
pliance description/ Accessories”).
f If you do not install an emergency/auxiliary heater,
activate the WW LEARNING FUNCTION parameter in
the WPM heat pump manager for fault-free opera-
tion.
9.7 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
separated from the power supply by an isolator that dis-
connects 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 power sup-
ply.
f Observe the type plate.
!
Material losses
f Provide separate fuses for the two power circuits
(for the appliance and the control unit).
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 discon-
nected from the distribution board.
The electrical data can be found in the chapter "Specification". You
require a J-Y (St) 2x2x0.8mm² cable as a BUS cable.
f Use cables with the relevant cross-sections. Observe the ap-
plicable national and regional regulations.
WPL 07 ACS classic| WPL 09 ACS classic
Fuse protec-
tion
Assignment Cable cross-section
1x B 16 A Compressor
(single phase)
2.5 mm² for routing through a wall
1.5 mm² when routing on a wall or in an
electrical conduit on a wall
1x B 16 A Control unit 1.5mm²
WPL 13 ACS classic.| WPL 17 ACS classic
Fuse protec-
tion
Assignment Cable cross-section
1x B 25A Compressor
(single phase)
≥ 2.5 mm²
Alternatively:
1x B 16 A Compressor
(single phase)
≥ 2.5 mm²
1x B 16 A Control unit 1.5mm²
You can safeguard the compressor using the alternative, smaller
fuse protection.

INSTALLATION
Installation
12|WPL ACS classic www.stiebel-eltron.com
f If you have selected a lower fuse protection for the compres-
sor, you will need to limit the maximum power consumption.
In the COMMISSIONING/ COMPRESSOR menu, adjust the
MAXIMUM CURRENT parameter. Observe the information in
the commissioning instructions for the heat pump manager.
10. Installation
10.1 Transport
!
Material losses
Protect the appliance against heavy impact during
transport.
You can transport the appliance in various ways:
f When carrying, hold on to the narrow sides (transverse
sides) under the base plate.
f Slide a robust pipe through the holes at the bottom of the
appliance frame to create a handle.
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. The longer the appliance is tilted, the greater
the distribution of refrigerant oil inside the system.
f Wait approx. 30minutes before starting the appliance after it
has been tilted.
10.2 Siting
f When siting the appliance, observe the air discharge direc-
tion (see chapter "Preparations/ Sound emissions").
f Mount the appliance on the T-support or wall mounting sup-
port. Observe the installation instructions for the mounting
bracket used.
10.3 Flow and return connection
!
Material losses
In cooling mode, condensate can form when the dew
point temperature is undershot.
f For cooling with fan convectors, the heating flow
and heating return lines must be provided with va-
pour diffusion-proof insulation.
f Take the position of the heating flow and return from the fol-
lowing diagram:
D0000058375
1
2
1 Heating flow
2 Heating return
f Connect the heat pump to the heating circuit. Check for leaks.
Cooling with a buffer cylinder
f Install an immersion/contact sensor in the heating flow,
downstream of the buffer cylinder.
10.4 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.
f Install the push-fit connectors only in the heating
circuit.
!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.
f Using a pipe cutter, cut a groove (depth ap-
prox.0.1mm) at a defined distance from the end of
the pipe.
- Pipe diameter 22mm: 17±0.5mm
- Pipe diameter 28mm: 21±0.5mm

INSTALLATION
Installation
www.stiebel-eltron.com WPL ACS classic|13
How the push-fit connectors work
The push-fit connectors are equipped with a retainer with stain-
less steel serrations and an O-ring for sealing. The push-fit con-
nectors 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
1 Retainer
2 Screw cap
3 Gap between screw cap and main body
4 Main body
D0000088520
Pipe Ø 22mm
Depth of insertion A max. 38mm
!Material losses
Pipe ends must be deburred.
f Always use a pipe cutter to trim pipes.
f Push the pipe past the O-ring into the push-fit connector
until it reaches the prescribed insertion depth.
f Finger-tighten the screw cap as far as it will go against main
body. This secures the push-fit connection.
Undoing the push-fit connection
If the push-fit connectors later need to be undone, proceed as
follows:
f Turn the screw cap anti-clockwise until there is a narrow gap
of approx. 2mm. Press the retainer back with your fingers
and hold on to it.
f Pull out the inserted pipe.
D0000088521
10.5 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.
f Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies (e.g. welding
pearls, rust, sand, sealant, etc.) can impair the operational
reliability of the heat pump.
f Connect the heat pump on the heating water side. Check for
leaks.
D0000105622
f Ensure that the heating flow and return are connected cor-
rectly. Do not twist the pipes in the appliance when connect-
ing.
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”).
10.6 Oxygen diffusion
!
Material losses
Do not use open vented heating systems. Use oxygen
diffusion-proof pipes in underfloor heating systems with
plastic pipework.
In underfloor heating systems with plastic pipes that are per-
meable 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 cylinder, on
buffer cylinders, steel radiators or steel pipes).
f In the case of oxygenation, separate the heating system be-
tween the heating circuit and the buffer cylinder.
!
Material losses
The products of corrosion (e.g. rusty sludge) can set-
tle in the heating system components, which may re-
sult in a lower output or fault shutdowns due to reduced
cross-sections.

INSTALLATION
Installation
14|WPL ACS classic www.stiebel-eltron.com
10.7 Filling the heating system
10.7.1 Water quality
Carry out a fill water analysis before filling the system. This analy-
sis may, for example, be requested from the relevant water supply
utility.
!
Material losses
To avoid damage as a result of scaling, it may be neces-
sary to soften or desalinate the fill water. The fill water
limits specified in chapter "Specification/ Data table"
must always be observed.
f Recheck these limits 8-12weeks after commission-
ing, 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 prevent corrosion.
Note
Suitable appliances for water softening, as well as for
filling and flushing heating systems, can be obtained via
trade suppliers.
Note
f Never add inhibitors or other additives to the fill
water.
Note
The appliance offers frost protection for the connection
lines in regular operation.
In the event of prolonged power failure or when shutting
down, drain the DHW side of the appliance.
If it is not possible to detect power failures (for example
if the system is in a holiday home left vacant for extended
periods of time), the following protective measure can
be taken.
f Add a suitable concentration of ethylene glycol to
the fill water.
f Please note that antifreeze changes the density and
viscosity of the fill water.
Part number
MEG 10 Heat transfer medium as concentrate on
an ethylene glycol base
231109
MEG 30 Heat transfer medium as concentrate on
an ethylene glycol base
161696
10.7.2 Filling the heating system
f Fill the heating system on the heating side.
10.7.3 Venting the heating system
The appliance has an automatic air vent valve.
D0000063489
1
1 Automatic air vent valve
f Remove the hood and the EPS cover (see chapter "Trouble-
shooting/ Checking the IWS DIP switch settings").
f Vent the pipework by turning the grey cap on the automatic
air vent valve.
f Close the automatic air vent valve after the venting process.
f Reattach the EPS cover and hood on the appliance.
10.8 External second heat generator
With dual mode systems, connect the heat pump into the return
of the second heat source.
10.9 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.

INSTALLATION
Electrical connection
www.stiebel-eltron.com WPL ACS classic|15
11. Electrical connection
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the terminal area.
Note
Please observe the instructions for the heat pump man-
ager.
Connection work must only be carried out by a qualified contractor
and in accordance with these instructions.
You must have permission to connect the appliance from the rel-
evant power supply utility.
11.1 Terminal area
The terminals are located in the terminal area of the appliance.
Observe chapter "Preparing the electrical installation".
f For all connections, use appropriate cables in accordance
with local regulations.
Access to the terminal area
D0000058263
f Unscrew and remove the two screws.
f Slide the cover down.
f Remove the cover by pivoting it open to the right.
D0000058264
1
2
1 Terminal area
2 Strain relief
f Route cables and leads through the strain relief fittings.
f Terminate the screen at both ends of the bus cable.
f If you wish to use the following appliance functions, install
an electric emergency/auxiliary heater. There is an emergen-
cy/auxiliary heater in the products required as accessories
(see chapter “Installation/ Appliance description/ Accesso-
ries”).
Appliance func-
tion
Effect of the electric emergency/auxiliary
heater
Mono energetic
operation
If the dual mode point is undershot, the electric emer-
gency/auxiliary heater safeguards both the heating oper-
ation and the provision of high DHW temperatures.
Emergency mode Should the heat pump suffer a fault that prevents its con-
tinued operation, the heating output will be covered by
the electric emergency/auxiliary heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <25°C, the electric emer-
gency/auxiliary 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.
Pasteurisation
mode
To heat up the water regularly to a temperature of 60°C
to protect against the growth of legionella bacteria, the
electric emergency/auxiliary heater is started automati-
cally when pasteurisation control is enabled.
f Connect the cables according to the following diagram.
f Earth the ELV lead by inverting the screen over the cable
sheath and clamping it under the earth terminal.
Note
f Earth the LV lead either at the outdoor unit or at one
of the products defined as required accessories (see
chapter "Installation/ Appliance description/ Acces-
sories").
f Then check that the strain relief fittings are working as in-
tended.

INSTALLATION
Commissioning
16|WPL ACS classic www.stiebel-eltron.com
!
Material losses
Strain relief fittings that are too tight may lead to a short
circuit.
f Never tighten them completely.
Connection
nc H L
N L1
X2X4X3
T
D0000058265
1
2
3
1X3 Compressor (inverter)
L1, N,
2X4 Control voltage
Power supply: L, N,
3X2 Safety extra low voltage (BUS)
nc (not assigned)
High H
Low L
12. Commissioning
A WPM heat pump manager is required to operate the appliance.
All necessary adjustments prior to and during operation are made
on this device.
Only qualified contractors may make the settings in the heat pump
manager commissioning report, commission the appliance and
instruct the owner in its use.
Carry out commissioning in accordance with these operating and
installation instructions, and the instructions for the heat pump
manager. Our customer support can assist with commissioning,
which is a chargeable service.
Where this appliance is intended for commercial use, the rules of
the relevant Operational Safety Ordinance must be observed at
commissioning. For further details, check with your local author-
ising body (e.g. TÜV).
12.1 Checks before commissioning
Before commissioning, check the following points (note the com-
missioning checklist):
12.1.1 Heating system
- Have you filled the heating system to the correct pressure
and closed the automatic air vent valve?
12.1.2 Temperature sensors
- Have you correctly positioned and connected the outside
temperature sensor and return temperature sensor (in con-
nection with a buffer cylinder)?
12.1.3 Power supply
- Have you correctly connected the power supply?
12.2 Ensuring a minimum flow rate
Note
The minimum flow rate and the defrost energy must al-
ways be assured (see chapter "Specification/ Data table").
When heating circuit temperatures are very low, in excep-
tional circumstances it is possible that the electric emer-
gency/auxiliary heater will be activated during a defrost
operation in order to provide the required defrost energy.
The appliance is designed in such a way that no buffer cylinder
is required in conjunction with appropriately sized area heating
systems.
Installations with several heating circuits require a buffer cylinder
to be used.
12.2.1 Sizing the heating circuits
For systems with a buffer cylinder, we recommend checking the
sizing of the heating circuits in order to ensure that the system
operates efficiently.
For systems without a buffer cylinder, you will need to check the
sizing of the heating circuits in order to ensure that the flow rate
is sufficient for defrosting and to avoid system failures due to
defrosting faults.

INSTALLATION
Commissioning
www.stiebel-eltron.com WPL ACS classic | 17
The design of the underfloor heating system determines the pos-
sible flow rate through the permanently open heating circuits.
If the flow rate of the permanently open heating circuits is less
than the minimum flow rate of the heat pump, check whether the
available external delivery head of the heating circulation pump
is sufficient.
Delivery head test
ΔpUP* ≥ (Vmin / VHKo)² × (ΔpHK + ΔpV) + ΔpWP
ΔpUP External delivery head of the circulation pump at Vmin
* If the circulation pump is integrated in an indoor unit, the
available external head can be found in the specification
for the indoor unit.
Vmin Minimum flow rate of heat pump
VHKo Design flow rate of the permanently open heating circuits
ΔpHK Design pressure drop of the permanently open heating
circuits
ΔpVDesign pressure drop to and from floor distributors
ΔpWP Pressure drop in the heat pump at Vmin
For heat pumps with an integral circulation pump, the pressure
drop of the heat pump (ΔpWP) is not taken into account.
If the external delivery head is not sufficient for the minimum flow
rate, additional heating circuits for the underfloor heating must
be permanently opened.
Checking the minimum flow rate
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/
auxiliary heater to isolate the emergency/auxiliary heater
from the power supply. Alternatively, switch OFF the second
heat generator.
f Ensure that hydronic balancing has been performed.
f Check the connected pumps against the hydraulic diagram.
12.2.2 Systems without a buffer cylinder
Note
If the appliance is operated solely through the WPM heat
pump manager, and an external pump that is not con-
trolled by the WPM is used as a heating circuit pump, you
will have to adjust the heating circuit pump manually.
For systems without a buffer cylinder, one or more heating cir-
cuits in the system must remain open. The open heating circuit(s)
must be installed in the lead room (room in which the external
programming unit is installed, e.g. living room or bathroom). The
lead room can be individually controlled using the external pro-
gramming unit, or indirectly by adjusting the heating curve or
activating room influence.
f Operate the appliance in heating mode.
f When designing underfloor heating in the lead room, ob-
serve our recommendations. The table applies if individual
room control is installed.
WPL
07 ACS
classic
WPL
09 ACS
classic
WPL
13 ACS
classic
WPL
17 ACS
classic
Minimum flow rate of heat pump
l/h 400 400 600 600
Minimum water content of the open heating circuits during
operation without buffer cylinder
l16 16 19 19
Composite pipework 16 x 2mm / installation spacing 10cm
Lead room floor area
m² 21 21 21 21
Number of circuits
nxm 3x70 3x70 3x70 3x70
Composite pipework 20 x 2.25mm / installation spacing 15cm
Lead room floor area
m² 21 21 21 21
Number of circuits
nxm 2x70 2x70 2x70 2x70
Buffer cylinder always required
No No No No
Buffer cylinder volume in relation to product range
l80-200 80-200 80-200 80-400
Activate the integral emergency/auxiliary heater
Yes Yes Yes Yes
f Fully open the heating circuit(s) in the lead room.
f Close all other heating circuits.
f If an overflow valve is installed in the heating system, close
this valve.
f Adjust the parameters.
Parameter Setting
MINIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
OFF
MAXIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
ON
f Check the current flow rate.
Parameter
WP WATER FLOW RATE (INFO/ HEAT PUMP/ PROCESS DATA)
f Compare the value with the minimum flow rate (see chapter
"Specification/ Data table").
Minimum flow rate has been reached
No further measures required.
f Reset the parameters to their original values.
Parameter Setting
MINIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
ON
MAXIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
OFF
Minimum flow rate has not been reached
If the specified flow rate is not met, take suitable measures to
achieve the flow rate.
f Open the heating circuit permanently in another room.
f Check the current flow rate.
f If the minimum flow rate is not reached, repeat these steps.
f Set the overflow valve correctly.

INSTALLATION
Settings
18|WPL ACS classic www.stiebel-eltron.com
12.2.3 Systems with a buffer cylinder
f Operate the appliance in heating mode.
f Adjust the parameters.
Parameter Setting
MINIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
OFF
MAXIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
ON
f Check the current flow rate.
Parameter
WP WATER FLOW RATE (INFO/ HEAT PUMP/ PROCESS DATA)
f Compare the value with the minimum flow rate (see chapter
"Specification/ Data table").
Minimum flow rate has been reached
No further measures required.
f Reset the parameters to their original values.
Parameter Setting
MINIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
ON
MAXIMUM PUMP RATE (COMMISSIONING/ CHARGING
PUMP CONTROL / STANDBY/ TYPE OF CONTROL)
OFF
Minimum flow rate has not been reached
f Check the technical guide to the heating system.
12.2.4 In cooling mode
If the buffer cylinder is bypassed in cooling mode, the flow rate
must be checked for cooling mode in the same way as for heating
mode.
f Observe chapter “Systems without a buffer cylinder”.
13. Settings
13.1 Heating curve adjustment
The efficiency of a heat pump decreases as the flow temperature
rises. Adjust the heating curve carefully. Heating curves that are
set too high result in the zone or thermostatic valves closing, which
may result in the minimum required flow rate in the heating circuit
being undershot.
f Please observe the instructions for the heat pump manager.
The following steps will help you to adjust the heating curve cor-
rectly:
- Fully open thermostatic or zone valves in a lead room (e.g.
living room and bathroom).
We do not recommend installing thermostatic or zone valves
in the lead room. Control the temperature for these rooms
via a remote control.
- At different outside temperatures (e.g. –10°C and +10°C),
adjust the heating curve so that the required temperature is
set in the lead room.
Standard values to begin with:
Parameter Underfloor heating Radiator heating
system
Heating curve 0.4 0.8
Control dynamic 25 50
Comfort temperature 20°C 20°C
If the room temperature is not high enough in spring and autumn
(approx. 10°C outside temperature), go to the heat pump manager
menu under "SETTINGS / HEATING / HEATING CIRCUIT" and raise
the "COMFORT TEMPERATURE" parameter.
Note
If no remote control is installed, raising the "COMFORT
TEMPERATURE" parameter will lead to a parallel offset
of the heating curve.
If the room temperature is not high enough when outside temper-
atures are low, increase the “HEATING CURVE RISE” parameter.
If you raise the “HEATING CURVE RISE” parameter, adjust the
zone valve or thermostatic valve in the lead room to the required
temperature when outside temperatures are high.
!
Material losses
Never reduce the temperature in the entire building by
closing all zone valves or thermostatic valves, instead do
this by using the setback programs.
Once everything has been implemented correctly, the system can
be heated to its maximum operating temperature and vented once
again.
!
Material losses
For underfloor heating systems, observe the maximum
permissible system temperature for that particular un-
derfloor heating.

INSTALLATION
Appliance handover
www.stiebel-eltron.com WPL ACS classic | 19
13.2 Reduced night mode (Silent mode)
f Look up the sound power level in the data table (see chapter
"Specification / Data table").
To reduce the sound power level of the appliance for a specified
period, you can set the appliance to night mode if required.
You can specify the times during which the appliance is set to night
mode using the time programs.
Parameter Meaning
PROGRAMS (SILENT PROGRAM 1) reduced night mode
PROGRAMS (SILENT PROGRAM 2) Appliance switched off
Two versions of night mode are available for you to use.
Version 1: reduced night mode
You can reduce the sound power level of the appliance through
its output or through the fans. If the emergency/auxiliary heater
cuts in, this will result in higher running costs.
Version 2: appliance switched off
You can switch the appliance off. If the appliance is switched off,
central heating and DHW heating will be supplied solely through
the emergency/auxiliary heater. If the emergency/auxiliary heater
cuts in, this will result in higher running costs.
13.2.1 Reduced night mode
Note
When reduced night mode is active, this may result in
higher running costs.
The output and fan control are infinitely variable.
f See the table for the maximum appliance sound levels ac-
cording to the settings made in the “COMMISSIONING/ SI-
LENT MODE/ OUTPUTREDUCTION/ OUTPUT” menu.
Setting in the
WPM
Sound power
level
Heating
output
Output re-
stricted to
[%]
Maximum value
due to output
restriction
[dB(A)]
Maximum at
A-7/W35
[kW]
WPL 07 ACS classic 70 54 2.23
43 52 1.38
WPL 09 ACS classic 70 56 2.65
35 52 1.38
WPL 13 ACS classic 70 58 4.96
35 57 2.76
WPL 17 ACS classic 70 61 4.96
35 57 2.76
f Adjust the fan control and compressor output in the heat
pump manager.
Parameter
OUTPUT (COMMISSIONING/ SILENT MODE / OUTPUT REDUCTION)
FAN (COMMISSIONING/ SILENT MODE / OUTPUT REDUCTION)
13.2.2 Appliance switched off
Note
If the appliance is switched off, central heating and DHW
heating will be supplied solely through the emergency/
auxiliary heater. This will result in higher running costs.
f Switch the appliance off in the heat pump manager.
Parameter
HEAT PUMP OFF (COMMISSIONING/ SILENT MODE)
13.3 Other settings
f For operation with or without a buffer cylinder, observe the
information in the instructions for the WPM and parameter
BUFFER OPERATION in menu SETTINGS/ STANDARD SET-
TING.
Using the heat-up program
When using the heat-up program, observe the information in the
commissioning instructions for the heat pump manager (chapter
“PROGRAMS/ HEAT-UP PROGRAM”).
14. Appliance handover
Explain the appliance function to users and familiarise them with
how it works.
Note
Hand over these operating and installation instructions
to users for safekeeping.
All information in these instructions must be closely ob-
served. The instructions provide information on safety,
operation, installation and maintenance of the appliance.
15. Shutting down the system
!
Material losses
Never interrupt the heat pump power supply, even out-
side of the heating season. Otherwise, system frost pro-
tection is not guaranteed.
The heat pump manager automatically switches the heat
pump to summer or winter mode.
15.1 Standby mode
To shut the system down, simply set the heat pump manager to
"Standby mode". This way, the safety functions that protect the
system remain enabled, e.g. frost protection.
15.2 Power interruption
If the system is to be isolated from the power supply permanently,
please observe the following:
!
Material losses
f If the heat pump is completely switched OFF and
there is a risk of frost, drain the system on the water
side.

INSTALLATION
Maintenance
20|WPL ACS classic www.stiebel-eltron.com
16. Maintenance
WARNING Electrocution
f Prior to commencing any service or cleaning work,
isolate the appliance across all poles from the
power supply.
Following disconnection from the power supply, parts of
the appliance may remain energised for 2minutes until
the inverter capacitors have discharged.
!
Material losses
Keep the air discharge and intake apertures free from
snow and ice.
f Remove any leaves or other foreign bodies from the evapora-
tor fins periodically.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance if required (to return the
system to its original condition).
17. Troubleshooting
WARNING Electrocution
f Before working on the appliance, isolate it from the
power supply at the control panel.
Following disconnection from the power supply, parts of
the appliance may remain energised for 2minutes until
the inverter capacitors have discharged.
Note
Please observe the instructions for the heat pump man-
ager.
If you cannot locate the fault using the heat pump manager, check
the control elements on the IWS.
f Read the following sections on troubleshooting and follow
the instructions.
17.1 Checking the IWS DIP switch settings
f Carry out the following steps to make the IWS accessible.
D0000063487
f Undo and remove the four screws on the sides of the hood.
f Remove the hood.
D0000063488
f Unscrew and remove the four screws on the top panel.
f Remove the top panel.
D0000063490
1
2
1
1
2
2
1 Screws to be unscrewed
2 Screws to be removed
f Unscrew and remove the screws.
D0000063530
f Completely remove the side panel by sliding it upwards.
f The IWS is located above the terminal area.