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1. Operating instructions
Description
The DHB hydraulically-controlled
instantaneous water heater heats the water
when the required volume of water flows
through the device.
Important information - in
brief
Power selector switch
To change the heating output to the
required level.
Shower comfort switch
For even more comfort when
showering.
Operation
Power selector switch
Full output
Automatic output modulation in 2 stages,
depending on the water volume, greatest
temperature increase,
1
/
or full load.
2
Energy saving
Automatic output modulation in 2 stages,
energy saving with
/
or
/
heating load
1
2
3
3
(summer operation).
Half load
Fine adjustment to max.
/
heating load,
1
2
full heating capacity blocked (constant low
water requirement).
Shower comfort switch
Variable setting
Fine adjustment of water volume and
temperature when showering, with hot
water tap fully opened.
Latching position
For high temperatures, or with low
pressure in the hot water system.
Trouble-shooting in the
event of problems
Set the output selector switch to the
basic setting
.
Set the shower comfort switch to the
basic position
.
Check fuses.
Check the fittings and shower head for
lime scale or dirt.
See page 13 for more fault-finding
information.
Recommended settings
for supplying bathroom and
kitchen:
Power selector switch:
Position
Shower comfort switch:
Latching position
.
The desired temperature is adjusted at
the fitting.
for the user and the qualified installer
For suppling bathroom only:
Power selector switch:
Filling bath, position
.
Showering in summer, position
Shower comfort switch:
Hot water valve fully open.
With sufficient pressure in the water
system, adjust the shower temperature
with the shower comfort switch
Operation with two-handle fitting/
mono-bloc mixer
The DHB automatically controls the
individual heat output depending on the
water flow rate (Stages and ) through the
device. To do this, a minimum volume is
required for actuation (see "Technical
Data").
Sink:
Open the hot water tap of the two-
handle fitting or set the mono-bloc mixer
to the Hot setting. With a low flow
volume, the device will switch on heating
stage . By reducing the flow at the hot
water tap, the output temperature can
be increased, and reduced by opening
the tap further.
Shower/bath/basin:
With the hot water tap fully open/mono-
bloc mixer at the hot setting, the device
will operate automatically in Stage . The
output temperature and hot water
volume can be changed by means of the
shower comfort switch
in cold water at the fitting.
Shower comfort switch:
Always in the latching position
Power selector switch:
Position
or
Take note of the instructions provided by the
manufacturer of the fitting.
The desired temperature at other tap
points is adjusted at the fitting.
With low pressure in the water system,
the shower comfort switch is to be set to
the latching position
.
The pressure loss in the downstream
fitting and in the hand-held shower in
particular, influences the temperature
selection possibility at the shower comfort
switch. Use hand-held showers with low
pressure loss (see page 12 for Relexa
hand-held shower).
Energy saving tip
The position
saves energy and
water when showering, especially
in Summer. For filling the bath, the
power stage
is
recommended (shorter filling time).
Important information
When selecting the temperature at
the draw-off fitting, water
.
temperatures of over 60 °C may be
reached. For this reason, children should
be kept away from the fitting, due to the
risk of scalding.
Air in the cold water pipe will destroy the
bare-wire heating system of the DHB. If
.
the water supply to the DHB has been
interrupted, for example due to the risk of
frost or work on the water pipe, the
following steps must be carried out before
the system is used again:
1. Disconnect the supply or disconnect the
fuses.
2. Open a hot water tap downstream of
the device for as long as is necessary for
the device and the cold water pipe to be
freed of air.
3. Reconnect the supply or connect the
fuses again.
Hot water output
Depending on the time of year, a variety of
cold water supply temperatures can be
obtained which in turn give the following
maximum flow volumes or mixed water
volumes (see table 1).
= Cold water inlet temperature
1
= Hot water outlet temperature.
2
Useful temperatures:
– Approx. 38 °C: E.g. for shower, hand was-
hing, bath filling, etc.
– Approx. 60 °C: For kitchen washing and
when using thermostat fittings (shower
comfort switch in latching position
or by mixing
= 38 °C
2
18 kW
l/min
1
6 °C
8,0
10 °C
9,2
14 °C
10,7
= 60 °C
2
18 kW
l/min
1
6 °C
4,8
10 °C
5,2
14 °C
5,6
Table 1
Maintenance
Maintenance work may only be
carried out by a qualified installer. An
overview of faults which you can rectify
yourself is provided on page 13.
Care
A damp cloth is all that is needed to care for
the housing. Do not use any abrasive or
aggressive cleaning agents.
Instructions for use and installation
Keep these instructions in a safe
place, and give them to the new
owner if you move house; if maintenance
or repair work is required, let the qualified
installer have them for reference.
).
21 kW
24 kW
27 kW
9,4
10,7
12,1
10,7
12,3
13,8
12,5
14,3
16,1
21 kW
24 kW
27 kW
5,6
6,4
7,2
6,0
6,9
7,7
6,5
7,5
8,4
9
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