STIEBEL ELTRON WWK 300 A, WWK 300 AH Operation And Installation

OPERATION AND INSTALLATION

DHW HEAT PUMP

» WWK 300 A

» WWK 300 AH

Contents

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1. Operating instructions for users
and contractors ____________________ 3

1.1 Operation and control �������������� 3

1.2 Device description ������������������ 3

1.3 Correct operation ������������������� 3

1.4 Incorrect operation ����������������� 3

1.5 Function description ���������������� 3

1.6 Operation with active defrost fea­ture
WWK 300 A and WWK 300 AH ���� 3

1.7 Maintenance and cleaning �������� 4

1.8 Troubleshooting by the user ������ 4

2. Installation instructions for con­tractors _____________________________ 5

2.1 Regulations and standards �������� 5

2.2 Installation ��������������������������� 6

2.3 Water connection ������������������� 6

2.4 Power supply ������������������������ 8

2.5 Commissioning ���������������������� 8

2.6 Safety equipment and mainte­nance ���������������������������������� 8

2.7 Specification ������������������������10

2.8 Operation with active defrost fea­ture ����������������������������������� 11

2.9 Wiring diagrams �������������������12

2.10 Dimensions and connections ����14

Guarantee __________________________________15

Environment and Recycling ______________15

Symbols used in these instructions

Observe the following safety instructions:

Please note: Warning about pos­sible dangers.

Note: Important information and
tips.

Note: Carefully read these

operating and installation
instructions and keep them safe. Should
the equipment change hands, pass these
instructions to the subsequent owner.
Pass them to the trained contractors for
servicing purposes.

Positioning, installation and commission­ing must be carried out by trained per­sonnel working in accordance with these
operating and installation instructions.

The appliance may be used by

children aged 8 and up and per­sons with reduced physical, sensory or
mental capabilities or a lack of experi­ence provided that they are supervised
or they have been instructed on how
to use the appliance safely and have
understood the resulting risks. Children
must never play with the appliance.
Children must never clean the appliance
or perform user maintenance unless
they are supervised.

Note: All measurements are given
in mm unless stated otherwise.

Standardised output data

Explanations to determine and interpret
the specified standardised output data

Standard: EN255-3

The output data specifically mentioned in
text, diagrams and technical datasheets
has been determined in line with the
test conditions described in the standard
shown in the heading of this chapter.

Generally, these standardised test condi­tions will not fully meet the conditions
found at the installation site of the system
user. Depending on the chosen test meth­od and the extent to which the selected
method deviates from the conditions
described in the standard shown in the
heading of this chapter, any deviations
can have a considerable impact. Further
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.

A confirmation of the specified output
data can only be obtained if the condi­tions applicable to the relevant test match
those of the standad shown in the head­ing of this chapter.

2

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1. Operating instructions for users and contractors

1.1 Operation and control

The Stiebel Eltron domestic hot water
heat pump WWK300A/AH (DHW)
is a DHW generator that operates
automatically and has a capacity of
approx. 300l. The water temperature is
permanently set to 60°C.

The device is installed, connected and
handed over ready for use by a qualified
contractor. Nevertheless, you should
familiarise yourself with the most
important technical features of your heat
pump.

WARNING Burns

The water in the DHW cylinder
can be heated to temperatures in
excess of 60°C. There is a risk of
scalding at outlet temperatures
in excess of 43°C.

In Australia and New Zealand
the installation shall comply with
AS/NZS3500.4: This standard
requires mandatory use of a
suitable tempering device (eg.
tempering valve, thermostatic
mixing valve) for all installations
that supply hot water to sanitary
fixtures used primarily for per­sonal hygiene.

1.2 Device description

The device extracts heat from the
ambient air. This energy is used to heat
the water inside the cylinder. Where the
device is installed inside a room, this is
cooled down through the heat extraction
by approx. 1 to 3°C. The device also
extracts moisture from the ambient air
that creates condensate, which must
be drained off. For this purpose, a
condensate drain is integrated into the
unit.

Special features of the WWK 300 AH

An electric booster heater is integrated for
heating approx. 100 litres of water in the
upper sector of the DHW cylinder.

1.3 Correct operation

The DHW heat pump is designed for
extracting heat from the ambient air and
the utilisation of that energy for heating
domestic hot water. The DHW heat pump
can be installed in the open as well as in
enclosed spaces.

The appliance is intended for domestic
use, i.e. it can be used safely by untrained
persons. The appliance can also be used

in a non-domestic environment, e.g. in a
small business, as long as it is used in the
same way.

1.4 Incorrect operation

The following are not permitted:

— The utilisation of greasy extract air.
— The heating of liquids other than

domestic hot water.

— The installation of the equipment:

a) in rooms where the temperature

is below the freezing point.

b) in rooms where the device is at

risk from explosions as a result
of dust, gases or vapours.

— Operation of the device with an empty

cylinder.

Always operate the unit with a



full water tank, otherwise high
pressures will develop in the refrigera­tion system, causing it to shut down. A
manual reset will be necessary after­wards to restart the unit.

1.5 Function description

Heat pump operation

This is the standard operating mode,
to which the limits of scope of the heat
pump apply (see: Specification). To
heat up the cylinder capacity of approx.
300litres of water in accordance with
EN255 part 3 to 60 °C, the WWK300A
requires:

Heat-

Room

up

temper-

time

ature

[h]

[°C]

10.1 15 70 15 3.19/3.3
5 42 70 15 5.61

τ

Heat-upϑRoomFrelϑCold water

10.1 h 15 °C 70 % 15 °C 3.19/3.3

5 h 42 °C 70 % 15 °C 5.61

If the heat pump is switched OFF
and ON again, for instance after a

power failure, the compressor will only
re-start (after approx. 3 minutes), when
the pressure inside the refrigerant
circuit has normalised again.

Electric booster heater (only for the
WWK300AH)

If there is a higher DHW demand or
the WWK was switched OFF because
you require hot water quickly, you can
accelerate the heat-up process by means

Rela­tive
humid­ity [%]

Cold
water
tempera­ture [°C]

WWK 300 A

COP

WWK
300 A

COP (t)

of the electric booster heater. For reasons
of saving energy, the electric booster
heater will only heat up approx. 100litres
of water in the upper section of the
cylinder.

The control thermostat of the electric
booster heater is preset to 60°C and will
be restarted when the DHW temperature
falls below 45°C. This safeguards not only
that primarily the heat pump provides hot
water, but also that you enjoy a high level
of DHW convenience when large amounts
of hot water are drawn.

The red ON indicator illuminates when
the electric booster heater is switched on.

1

1 Red indicator

1.6 Operation with active de­frost feature

WWK 300 A and WWK 300 AH

Subject to the relative humidity and the
DHW temperature, the evaporator begins
to build up hoar frost at an ambient
temperature of below 6°C.

If the evaporator is covered in hoar
frost, the frost monitor N2 (see wiring
diagram) switches the fan OFF, whilst
the compressor continues to run, and
the changeover valveV2 routes the hot
gas directly to the evaporator. For this,
the condenser is shut off by changeover
valveV1 (see Fig.4). When the
temperature at the evaporator fins rises
above 3°C, the fan is started again, and
DHW heating continues.

The DHW heat pump can be operated at
ambient temperatures as low as 0°C.
The evaporator is defrosted according to
demand in the temperature range 0°C to
+6°C. This extends the heat-up time.

Ambient temperature

The heat pump must not be

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installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently

drop below 0°C.

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1.7 Maintenance and cleaning

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The device is generally maintenance free,
with the exception of cleaning the con­densate drain and having an authorised
contractor check the sacrificial anode (as
outlined below).

A damp cloth is sufficient for cleaning
all plastic parts. Never use scouring or
solvent-based cleaning agents.

PLEASE NOTE: Maintenance work,

e.g. checking the electrical safety,
must only be carried out by a qualified
contractor.

z Check at least monthly the condensate

drain at the middle of the unit (see
Fig. 1, number 13) and at the top the
condensate pan drain (visual check,
see Fig.3, pos.15). Remove contami­nants and blockages immediately.

z For the WWK300AH, it is recommen-

ded that the electric booster heater be
descaled from time to time. This will
result in prolonged life fo the electric
booster.

z Your local contractor, who is familiar

with the local water quality, should
identify for you the timing of the next
service.

z Ask your local contractor to regularly

check the safety assembly and the
electric booster heater.

z The device is subject to mains water

pressure. The expansion water drips
from the safety valve during heat-up.
Inform your local contractor of water
drips from the system after the he­at-up process has ended.

PLEASE NOTE: The sacrificial

anode must be checked by a
qualified contractor 12 months after
the unit has been installed and checked
periodically thereafter as advised by
the qualified contractor. Failure to do so
may void your warranty.

z To protect the steel cylinder against

corrosion, the interior is coated with
a special enamel and is furthermore
equipped with a protective anode.
Ask your local contractor to check the
protective anode 12 months after in­stallation and periodically thereafter
as advised by your local contractor. A
sacrificial anode maintenance log is
located at the end of this manual for
your local contractor to fill in.

1.8 Troubleshooting by the user

No hot water

Should you fail to obtain hot water at any
time, you can take the following steps to
remedy that situation.

No electrical power

Check the fuse/circuit breaker in your fuse
box. If it has blown/tripped, replace/reset
the fuse/MCB. If it should blow/trigger
repeatedly, notify your local contractor.

Still no hot water, even though power is
available

Check, whether the air inlet/outlet is
blocked.

The thermoswitch trips out or the high
limit safety pressure limiter switches
the compressor OFF if the compressor
is overloaded due to excessive ambient
temperature or excessive air temperature
(>42°C), or because of a fault in the
refrigerant circuit. Ask your local
contractor to remove the fault.

After a short cooldown phase, the
thermoswitch will restart the compressor
automatically.

The high limit safety pressure

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limiter must only be reset by your
contractor after he has removed the
cause of the relevant fault.

Other issues

Safety valve of the cold water supply line
drips

This may occur during the heat-up phase
and is completely normal.

The condensate drain drips

This always happens when the surface
temperature of the evaporator is lower
than the ambient dew point temperature.

For all other faults, consult your
contractor.

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2. Installation instructions for contractors

Cold Water

2.1 Regulations and standards

z The installation (water and electrical

work) and commissioning, as well as
the maintenance of this equipment,
must only be carried out by an autho­rised qualified contractor in accordan­ce with these instructions.

z Perfect function and safe operation

can only be assured when using origi­nal accessories and spare parts inten-

ded for this equipment.
z DIN VDE 0100 / DIN VDE 0701
z Regulations of your local electricity

supply utility.
z DIN 1988 / DIN 4109
z Regulations of your local water supply

utility.

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2

Also observe the following:

z The equipment type plate

z The specification

z Water installation

— Observe AS/NZS 3500.4 [local

regulations].

— Material of the cold water line:

Steel, copper or plastic pipe
systems.

— Material of the hot water line:

Copper or plastic pipe systems.

13

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DHW

7

1 Cold water supply G1

(G¾ female with adapter)

2 Hot water connection G1

(G¾ female with adapter)

3 Condensate drain G¾hose

connection (20mm male)

4 Connection for P&T relief valve G¾ (on-site)
5 Electrical cable (without plug)
6 Drain valve (on-site)
7 Expansion control valve (if required*, on-site)
8 Straight-through shut-off valve (on-site)
9 Pressure gauge test connector ** (on-site)
10 Non-return valve (on-site)
11 Test valve connection **
12 Pressure reducing valve (on-site)
13

Condensate spillover

Fig. 1

1

10

11

48°

6

8

9

8

12

5

* Not all local regulations mandate the use of an

expansion control valve (ECV).

** Optional, depending on installation requiments

30°

3

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2.2 Installation

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Transport

To protect the equipment against
damage, it must be transported vertically
inside its dedicated packaging. Where
space is restricted, you may also briefly
move the equipment tipped backwards at
an angle.

Positioning

— Position the device in the installation

location.

Note: Ensure that the casing

panel in the lower area of
the device is not damaged during
positioning.

— Remove packing straps and

polystyrene mouldings.

— Level the device by adjusting the

equipment feet.

— After leveling the device fix the nut of

the rubber feet to provide a maximum
of structural safety.

External installation

The location where the WWK is to be
installed must meet the following
conditions:

— Load-bearing floor (wet weight of the

WWK approx. 430kg).

— Never operate the WWK in rooms at a

risk from explosion due to dust, gases
or vapours.

— It is preferred that the location of

the unit is not near a bedroom or a
neighbour´s bedroom. Ideally a unit
may mounted near a kitchen or laun­dry. Opposite a neighbours garage is
always prefferred.

— The water heater should be located

as close as possible to the most fre­quently used hot water tap connec­tion.

— Ensure that the data plate is clearly

visible.

— Ensure that the ambient temperature

lies within the application limits for
heat pump operation.

The heat pump must not be

installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently
drop below 0°C.

Where possible select an installation
location that has limited exposure to ex­treme rain or snow.

Mount the unit so that it is not exposed to
direct strong wind, but is well ventilated.
The air inlet and outlet must be free. Pro­tect your device with possibly a canopy, a
base and baffles to weather.

Internal installation

The room where the WWK is to be
installed must meet the following
conditions:

— Load-bearing floor (wet weight of the

WWK approx. 430kg).

— Never operate the WWK in rooms at a

risk from explosion due to dust, gases
or vapours.

— Include in your considerations the

utilisation of waste heat, for example
from a boiler, tumble drier or refrig­erator/freezer.

— The available floor area in the instal-

lation room must be at least 6 m².
Never install this equipment in rooms
with a volume of less than 13 m³.

— Never restrict the clearances of the

WWK through walls and ceilings fur­ther than illustrated in Fig.2.

The heat pump must not be

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installed in areas where ambient
temperatures frequently exceed 42°C
or areas where temperatures frequently

drop below 0°C.

Positioning

≥ 400

— In case of indoor installation and min.

installation room volume, the room
temperature might be reduced by ap­prox. 1-3°C through the heat pump
operation. The initial temperature is
reached again approx. ½ h after the
heat pump has been switched OFF.

When installing the heat pump in a boiler
room, ensure that the boiler operation
will not be impaired.

Do not place the device near high fre­quency machines.

2.3 Water connection

— Remove the protective caps from the

connectors.

— With a sharp knife, cut a hole into the

protective caps and invert over the
pipe to be connected.

— Connect the pipe and refit the

protective caps.

Please note: To protect against

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the risk of corrosion, make the
connection as flat packing seal. The use
of hemp, teflon, or thread seal tape on
connections is not acceptable.

1

1 Condensate drain
2 Hot water connection
3 Condensate spillover

Air

3

2

Air

26�03�01�1619�

≥ 100

Installation locations with aggressive air
(e.g. air loaded with ammonia, chlorine,
metals, oil, ...) are inadmissible because
they can cause damage to the device.

6

Fig. 2

670

≥ 400

≥ 400

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