STIEBEL ELTRON WWK 300 A, WWK 300 AP, WWK 300 AH, WWK 300 AHP Operating And Installation Instructions

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Operating and installatiOn instructiOns

Supplied by K.V.A.Control cc

www.kvacontrol.co.za

dHW Heat pumps

» WWK 300 a
» WWK 300 ap
» WWK 300 aH
» WWK 300 aHp

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Contents

Observe the following safety instructions:

Please note: Warning about possible dangers.

Note: Important information and tips

1. Operating instructions for users and contractors

1.1 Operation and control ......................................................................................................................... 3

1.2 Device description

1.3 Correct operation

1.4 Incorrect operation

1.5 Function description

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

1.7 Operation with passive defrost feature
WWK 300 AP and WWK 300 AHP

1.8 Maintenance and cleaning

1.9 Troubleshooting by the user ............................................................................................................... 4

2. Installation instructions for contractors

2.1 Regulations and standards ................................................................................................................. 5

2.2 Installation ......................................................................................................................................... 6

2.3 Water connection

2.4 Power supply ...................................................................................................................................... 7

2.5 Commissioning ................................................................................................................................... 8

2.6 Safety equipment and maintenance

2.7 Specification ....................................................................................................................................... 9

Where children or persons with limited physical, sensory or mental capabilities are to be allowed to
control this equipment ensure that this will only happen under supervision or after appropriate
instructions by a person responsible for their safety. Children should be supervised to ensure that
they do not play with the equipment.

Symbols used in these instructions

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3

1. Operating instructions for users and contractors

Supplied by K.V.A.Control cc

www.kvacontrol.co.za

1.1 Operation and control

The Stiebel Eltron domestic hot water
heat pump WWK 300 A/AP/AH/AHP
(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.

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 with
closure incl. a strainer is integrated in the
floor of the device.

Special features of the WWK 300 AH and
WWK 300 AHP

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.

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: —

in rooms where the temperature is a)
below the freezing point.

in rooms where the device is at risk b)
from explosions as a result of dust,
gases or vapours.

Operation of the device with an empty —
cylinder.

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 requires ... :

τ

Heat-upϑRoomFrelϑCold water

10.1 h 15 °C 70 % 15 °C 3.19

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 and WWK 300 AHP)

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

COP (t)

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
Fig. 6 and 7) 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

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

1.7 Operation with
passive defrost feature

WWK 300 AP and WWK 300 AHP

The limit of application of the WWK AP /
AHP (without hot gas defrost feature) is
set to 6 °C.

However, with this limit of application,
the evaporator may build up hoar frost
subject to air temperature and relative
humidity, particularly when the DHW
temperature is low. The compressor
will be switched OFF as soon as the
evaporation temperature lies below ­7 °C for any length of time. When the
temperature at the evaporator fins rises
above 3 °C, the compressor are started
again, and the DHW heating continues.

Ambient temperature

The heat pump must not be
installed in areas where ambient

temperatures frequently exceed 42 °C
or areas where temperatures frequently
drop below 6 °C

1.8 Maintenance and cleaning

The device is generally maintenance free,
with the exception of cleaning the strainer
in the condensate drain.

Sand and dust can result in sludge
building up inside the strainer. Therefore,
clean the strainer at least twice per
annum or in accordance with demand.

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.

Check the condensate drain at least z
monthly at the bottom strainer outlet
and at the top condensate pan drain
(visual check, see Fig. 4, pos 16).