InstallatIon and operatIng InstructIons
°C
ON
OFF
1x
>60°C
ECO
domestIc hot water heat pump
wwk 300
»
wwk 300 sol
»
2
Index Page
Specification 2
Special accessories 2
Operating instructions - for users
1 Operation and control 3
1.1 Equipment description 3
1.2 Correct operation 3
1.3 Incorrect operation 3
1.4 Description of functions 3
1.5 Operation outside the scope of
applications 3
1.6 Maintenance and cleaning 3
1.7 Operation and control 4
1.8 Troubleshooting by users 4
Installation instructions - for contractors
2 Safety equipment and maintenance 5
2.1 On the equipment 5
2.2 On the system 5
3 Installation 6
3.1 Transport 6
3.2 Positioning 6
3.3 Water connection 6
3.4 Boiler connection 7
3.5 Electrical connection 8
4 Commissioning 9
5 Shutting the equipment down 9
Environment/recycling 9
Customer service/warranty 9
Information for owners
Keep these operating instructions safely and
pass them on to any new user, should the
equipment change hands. Let your contractor
check their content in conjunction with any
maintenance or repair work.
Positioning, installation and commissioning
must be carried out by trained contractors,
in accordance with these operating and
installation instructions.
The manufacturer’s warranty only applies,
if the WWK 300 is installed, connected and
operated in accordance with these operating
and installation instructions.
In conjunction with the positioning/
installation, observe all local/national
standards and requirements, as well as the
stipulations by your local water board and
energy supply company.
Specification
Type WWK 300 WWK 300 SOL
Part no. 074361 074362
Operational limits of the heat pump
DHW temperature Heat pump
Electric heating element
Air volume / throughput
Cylinder capacity
°C +6 to +35 +6 to +35
°C +25 to +55
(adjustable)
+65 (fixed)
+25 to +55
(adjustable)
+65 (fixed)
m3/h 550 550
l 303 284
Refrigerant / filling volume -- / g R 134a / 850 R 134a / 850
Dimensions H / W / D
Weight dry / filled
mm 1792 / 660 / 690 1792 / 660 / 690
kg 150 / 453 180 / 464
Voltage / frequency V/Hz L/N/PE ~ 230 / 50 L/N/PE ~ 230 / 50
P
(ttl. power cons.) / fuse kW / A 2.0 / 16 gL 2.0 / 16 gL
N max.
Water connections (male thread)
Circulation connections (male thread)
mm Ø 22 (outside) Ø 22 (outside)
inch G ½
4)
G ½
4)
Condensate connection mm Ø 20 Ø 20
Permitted pressure, water side
Maximum power consumption Heat pump
Heating capacity HP
2)
COP (t)
2)
1)
Power consumption Electric heating element
bar 6 6
kW 0.53 0.53
kW approx 1.6 approx 1.6
4.2 4.2
kW 1.5 1.5
Condenser Safety heat exchanger
Heat exchanger for external DHW heating (type SOL)
2
Heat exchanger surface
m
Material
Content l
Permitted pressure
bar
Permitted flow temperature
Pressure drop - heat exchanger
hPa
°C
-
-
-
-
-
-
1.3
St-em
11
10
95
4.5
(1000 l/h)
Pressure drop - heat exchanger
hPa
-
8
(1500 l/h)
Heating capacity - heat exchanger
3)
kW
-
13.7
at flow temp. 55 °C
(flow rate: 1000 l/h)
Water con. heat ex. (male thread)
1)
Test point at 35 °C air temperature, 70 % rel. humidity and 55 °C water temperature.
2)
Average value at 15 °C air temperature, 70 % rel. humidity, and heating water from 15 °C to 55 °C.
3)
At an average temperature difference ∆T = 30 K (difference between the average heat exchanger
temperature and the average cylinder temperature).
4)
ISO 7-1.
mm
-
Ø 22 (outside)
Additionally Order.-No. Description
PK 9 18 21 38 Condensate pump
Air channel adaptor 07 14 48 For connection to air hoses / channels160
and 200 mm dia. (circular)
Operating instructions for users and contractors
1 Operation and control
The WWK 300 domestic hot water (DHW) heat
pump from STIEBEL ELTRON is an automatic
DHW heater offering a capacity of approx. 300
l. The required DHW temperature can be preselected.
Your local contractor will install, connect and
commission your WWK. Nevertheless, you
should familiarise yourself with the most
important aspects of this equipment.
1.1 Equipment description
The WWK 300 contains two heat sources
within the cylinder; both heat the water to the
required temperature:
– Heat pump
– Electrical supplementary heater
The WWK 300, with suffix SOL, not only
contains a heat pump and an electrical
supplementary heater, but also a heat
exchanger permanently fitted inside the
cylinder, which can be supplied with energy
from a boiler or solar heating system.
The WWK 300 extracts energy from the air
which can be utilised to heat the water
contained inside the cylinder. This energy
extraction leads to a cooling of the installation
room by approx. 1-3 °C. The WWK can also
be operated with a connection to an air duct
(for part no., see page 2). However, such air
channels must not be smaller than Ø 160 mm;
their length should not exceed a maximum of
approx. 5 m.
The WWK 300 also extracts moisture from the
air, which turns into condensate and must be
drained off. A hose connection is provided for
that purpose.
1.2 Correct operation
This DHW heat pump is designed to extract
energy from the air inside the equipment
installation room or from a room, to the
ambient air of which it is connected, via air
ducts. With that energy it heats domestic hot
water (DHW).
1.3 Incorrect operation
Never
– use greasy exhaust air
– heat liquids other than potable water
– install the equipment
a) outside
b) in rooms at risk from frost
c) in rooms at risk from dust, gases
or vapours liable to explode
– operate the equipment with an empty
cylinder
– operate the integral heat exchanger
inside the equipment cylinder with
liquids other than heating water.
1.4 Description of functions
1.4.1 Heat pump operation
This is the standard operating mode, to which
the limits of scope of the heat pump apply
(see: specification). To heat the cylinder
content of approx. 300 litres of water to 55 °C,
the WWK 300 (to EN 255 part 3) requires:
ϑ
6 °C 70 % 15 °C 11.5 h 3.3
15 °C 70 % 15 °C 9.0 h 4.2
35 °C 47 % 15 °C 6.4 h 5.2
The water inside the cylinder will be heated to
55 °C by the electrical supplementary heater,
which is controlled by the programmable
time switch, subject to the heating period
being long enough. This enables the option
of making greater mixing water volumes
available at certain times. At all other times,
the water will be heated to the temperature
selected on the controller (see page 4, Fig. 1,
item 3).
failure, the compressor will only
re-start (after approx. 15 minutes) when the
pressure inside the refrigerant circuit has
normalised again.
1.4.2 Electrical supplementary heater
You can accelerate the heating-up process
with the electrical supplementary heater, if the
DHW demand increases or if the WWK 300 has
previously been switched OFF and you require
hot water as quickly as possible. For reasons
of saving energy, the electrical supplementary
heater only heats the top third of the cylinder
capacity (approx. 100 litres). This takes approx.
2 hours.
In SOL versions, approx. 50 litres are heated
up due to the flange being positioned higher
up on the cylinder.
The electrical supplementary heater is
switched ON when the actual temperature falls
below 58 °C and is switched OFF when 65 °C
are exceeded.
Press the push button only once if you want to
activate the electrical supplementary heater
only to cover a peak demand.
1.4.3 Boiler operation via heat exchanger
A heat exchanger, which is generally
connected to a central heating system, is
integrated into the cylinder. Subject to the
heating water flow temperature, the entire
cylinder capacity should be heated up by the
heat exchanger in between 3 and 4 hours.
H
Space
If the heat pump was manually switched OFF and ON again after a power
(only for SOL version)
ϑ
rel
Cold waterτ Heat-up
COP(t)
1.5 Operation outside the limits of use below
6 °C to 4 °C
Subject to the relative humidity and the
DHW temperature inside the cylinder, the
evaporator begins to ice up below a room
temperature of 6 °C. When the evaporator
is covered in hoarfrost, the frost stat N2 (see
wiring diagram) shuts down the compressor,
whilst the fan continues to operate, thereby
defrosting the compressor. The compressor
starts again automatically after the defrosting
process has been completed, and the heat
pump operation continues.
The minimum temperature required for the
heat pump operation is +4 °C. The evaporator
is defrosted upon demand at operating
temperatures between +4 and
+6 °C. This increases the heat-up time.
Room temperature higher than 35 °C
The heat pump will be switched OFF by safety
equipment at room temperatures above
approx. 35 °C. The heat pump will be restarted automatically after a brief cooling
down period. The heat pump will be switched
OFF again if the room temperature is still
higher than 35 °C.
Take appropriate steps to prevent
the ambient temperature rising
above 35 °C.
1.6 Maintenance and cleaning
The WWK 300 is largely maintenance free.
Maintenance must only be carried out by
qualified contractors.
Have the protective anode checked regularly.
Your contractor, who will be familiar with
your local water quality, will advise you of the
optimum timing for such maintenance. The
first inspection of the protective anode is due
after two years.
Never exceed the maximum inlet temperature of 65 °C into the heat pump
heat exchanger.
3
4
°C
ON
OFF
1x
>60°C
ECO
1.7 Operation
1.7.1 Overview of the user interface
3 (N1) 1 (S1)
C26_03_01_0312
Description in brackets, see wiring diagram Fig. 8, page 8
Fig. 1
Function
WWK 300 / WWK 300 SOL
Only heat pump operation 25 °C to 55 °C.
Single reheating via the electrical heater rod to 65 °C.
Programmed start of the electrical heater rod via the time switch.
1.7.2 Description of functions
– Switch (1) switches the entire heat pump
ON (I) or OFF (0).
– Using push button (2), you can activate
a single quick heat-up of the cylinder via
the electrical supplementary heater. After
the top third of the cylinder capacity has
segments. The shortest switching period is
2 hours long. Segments pressed inwards
towards the disk centre (approx. 2 mm lift)
are switched ON.
– The DHW display sensor captures the DHW
temperature inside the upper third of the
cylinder (approx. 100 litres).
reached a DHW temperature of 65 °C, the
electrical supplementary heater is switched
OFF, but is not automatically switched ON
again.
– An indicator lamp is integrated into push
button (2), which lights up when the
electrical supplementary heater is switched
ON.
– Select the DHW temperature with the rotary
selector (3) of the thermostat,
Fully clockwise approx. 55 °C
ECO approx. 40 °C
(frost protect. stage) approx. 25 °C
In position ECO, the heat pump operates more
efficiently than at the r.h. end stop. You will
need to establish the DHW temperature you
require, because a higher temperature would
result in a larger volume of DHW at approx.
40 °C (temperatures for baths and showers are
generally around 40 °C).
– The time switch (4) is equipped with
a week disk comprising 84 switching
1.8 Troubleshooting by the user
1.8.1 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. Notify your local contractor, if the
MCB trips/fuse blows again when you insert
the mains plug into the socket again.
Still no hot water, even though power is
available
Check, whether the air inlet/outlet is
unobstructed.
The thermoswitch trips out or the high
limit safety pressure limiter switches
the compressor OFF if the compressor
4 (S5) 2 (S2 / H1)
Main ON/OFF
switch (1)
ON – –
ON 1x –
ON – Yes
Push button (2) Clock (4) programmed
is overloaded due to excessive ambient
temperature or excessive extract temperature
(>35 °C), or because of a fault in the
refrigerant circuit. Ask your local contractor to
remove the relevant fault.
The thermoswitch automatically switches itself
ON again.
The high limit safety pressure limiter
must only be reset by your contractor after he has removed the cause of the
relevant fault.
1.8.2 Other faults
Safety valve of the cold water supply line drips
This may occur during the heat-up phase and
is completely normal.
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.
DHW heating can be maintained in most
fault conditions by switching the electrical
supplementary heater ON.
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