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1. Operating instructions
1.1 Description of the unit
The DEL electronic LCD instantaneous water
heater heats the water as it flows through the
unit. The hot water outlet temperature can
be adjusted precisely to the required degree
setting and in stepless mode from 30 °C to
60 °C, using the thermostat. From a water
volume of 3 l/min, depending on the tem-
perature setting and the temperature of the
cold water, a combined regulation and control
system will switch on the correct heating
output.
1.2 The most important
points - at a glance
e l e c t ro n i c L C D
e l e c t ro n i c L C D
Display with temperature
indication 30 - 60 °C
Thermostat
By rotating the thermostat, the desired
temperature can be steplessly adjusted
and read off on the display.
If the preselected output temperature is
not achieved with the tap fully open, this
means that more water is flowing through
the unit than the heating elements can
heat (output limit 18, 21, 24, or 27 kW).
In this event, the water volume needs to
be reduced accordingly at the hot water
outlet.
There is a danger of scalding with output
temperatures in excess of 43 ºC.
1.3 Important notes
Without a temperature limiter on the
unit, high water temperatures may
occur at the hot water outlet.
Children should therefore be kept away
from the hot water outlet.
Danger of scalding.
When operating with pre-heated water, the
output temperature may be higher than the
reference temperature which has been set
at the thermostat.
If the water feed to the unit is interrupted,
for example due to the risk of freezing or
work being conducted on the water mains,
the following procedures must be carried
out before the system is taken back into
use:
1. Remove the fuses or disconnect them.
2. Turn any hot water fittings downstream
of the unit on full until the unit and the
cold water pipe have been bled and are
free of air.
3. Replace the fuses again, or connect them
again.
for the user and the qualified installer
1.4 Hot water output
Cold water temperatures vary depending on
the time of year. The following maximum
output volumes, or mixed water volumes, can
be achieved with these different cold water
inlet temperatures (see Table 1):
ϑ
= Cold water inlet temperature
1
ϑ
= Mixing water temperature
2
ϑ
= Output temperature
3
• Useful temperature:
– approx. 38 ºC: For example, for showers,
hand basins, filling baths, etc.
– approx. 60 ºC: For dishwashers and when
using thermostatic fittings.
ϑ ϑ ϑ ϑ ϑ
= 38 ºC (Mixing water temperature)
2
18 kW 21 kW
24 kW 27 kW
ϑ
l/min
1
6 ºC
8,0
9,4
10,7
10 ºC
9,2
10,7
12,3
14 ºC
10,7
12,5
14,3
ϑ ϑ ϑ ϑ ϑ
= 60 ºC (Output temperature)
3
18 kW 21 kW
24 kW 27 kW
ϑ
l/min
1
6 ºC
4,8
5,6
6,4
10 ºC
5,2
6,0
6,9
14 ºC
5,6
6,5
7,5
Table 1
The actual output volume depents on the
supply pressure available.
1.5 Temperature limitation
º
A temperature limit of 43
C can be set by a
qualified installer.
1.6 Remote control
The unit can be operated via a fitted cable, by
means of a remote control device type FS 1
(see "2.15, Special Accessories").
The thermostat and the display on the unit
do not then function (inactive).
1.7 Setting recommendation
• Operation with thermostatic fitting
In order to ensure correct operation of the
thermostatic fitting, the unit must be set to a
º
temperature of more than 50
C.
1.8 First Aid in the event of
faults
• Check the fuses
• Check that the fittings and shower controls
are free of limescale or dirt contamination.
See also "3. Fault finding - User".
1.9 Care and maintenance
Maintenance work, such as checking
electrical safety, may only be carried
out by a qualified installer.
All that is needed to clean the housing is a
damp cloth. Do not use any abrasive or caus-
tic cleaning substances.
1.10 Instructions for Installa-
tion and Use
Follow these instructions carefully,
and, in the event of change of owner-
ship, pass them on to the new user. If any
maintenance or repair work is necessary,
give them to the qualified installer for him
to read.
12,1
13,8
16,1
7,2
7,7
8,4
11
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