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– In the case of a concealed connection, the
connection lead must project at least
30 mm from the wall, properly insulated
.
– Priority circuit
in combination with
other electrical units, such as electric stor-
age heaters, the load-shedding relay is to be
used:
a. Load-shedding relay (see "2.15 Special
Accessories").
b. Control line to the switching contactor of
the second unit (e.g. electric storage
heater).
c. Control contact, open when the HDE
electronic is switched on.
Load-shedding takes place when the HDE
electronic unit is in operation.
The load-shedding relay may only be
connected to the middle phase of the
unit terminal strip.
Connection in the lower unit area
In the delivery state, the unit is prepared for
the electrical connection to be in the lower
part of the unit.
– Set the unit up as shown in the illustration.
– To provide a seal against water penetration,
the cable grommet (26) provided must be
used.
– Connect the connection lead to the termi-
nal block.
Connection in the upper part of the unit
Preparing the unit for electrical connection at
the top:
– Knock out the infeed aperture marked out
in the rear wall (a) of the unit.
– Shorten the cable grommet (b) for the seal,
wet with a rinsing agent on the inside to
provide a better fit (sliding capacity), and
install in the rear wall (c).
– Release the plastic profile strip (d).
– Release the terminal block (e).
– Fit the terminal block in the upper part of
the unit (f). Care must be taken to ensure
that the switch lead wires do not project
over the rear wall of the unit.
– Fit the plastic profile strip (g).
Carrying out the electrical connection
To provide protection against water pen-
etration, the cable grommet provided (26)
and the plastic profile strip must be fitted
and the dimensions properly respected.
Connect the connection lead to the termi-
nal strip.
2.12 Completing installation
1. Open the three-way isolating valve (a)
2. Fix the lower part of the rear wall (b)
3. Fit the lower securing screw (c).
4. With a surface installation for the water
connection
, knock out the passage
apertures
(d) in the cover in an appro-
priately clean manner, or use a file. The
guide pieces (e) provided with the unit
must be engaged in the apertures.
5. If required, activate the temperature miter
(see "2.9 Temperature Limitation").
14
2.13 Taking into operation
for the first time
(This may only be done by a qualified installer)
Fill the unit and bleed it of air;
ensure there is no risk of dry
running.
Open and close all the attached hot
water fittings several times, until the
pipe network and the unit are free of
air. With regard to air, see under
"2.2 Important Notes".
Activate the safety switch
The HDE electronic is supplied with the
safety switch activated (press the blue
reset button in).
Insert the plug of the setpoint
sensor cable to position X 1.
Fit the cover and secure it with
screws.
Connect the network voltage.
Turn the thermostat to the left
and right stops to calibrate the
unit.
Check the function of the
instantaneous water heater.
Handing over the unit:
Explain to the user how the unit works and
acquaint them with the instructions for use.
Important notes:
Advise the user about possible risks
(scalding).
Hand over these instructions, which are to
be kept in a safe place.
2.14 Operation with pre-
heated water
The HDE electronic unit allows for reheating
of the incoming water up to a maximum of
60 °C.
If the incoming water is already at
more than 55 °C, it will not be
heated.
A maximum incoming temperature of 60 °C
can be guaranteed by installing a central
thermostatic fitting (see "2.15 Special
Accessories").
2.15 Special accessories
Two-handle pressure fittings
– Kitchen fitting WKMD
Order No. 07 09 17
– Bath fitting WBMD
Order No. 07 09 18
Construction set, two-piece water
plugs G ½
Order No. 07 40 19
Required with water installations for surface
fittings, not for WKMD or WBMD fittings.
Load-shedding relay LR 1-A
Order No. 00 17 86
Priority circuit for the HDE electronic, with
simultaneous operation of, for example,
electric storage heaters.
For connection of LR 1-A, see
Remote control FS 1
for HDE elec-
tronic operation.
Setting button for installation in a concealed
socket.
Order No. 16 73 30
With a remote control unit installed, operation
is only possible with the FS 1 remote control
unit.
The remote control unit is operated with
safety extra-low voltage. Suitable connection
leads (without metallic screening) are, for
example, NYM 3 x 1.5 or J-YY 2x2x0.6 (tel-
ephone line).
Fixed-position laying of the control lead, on
the surface or concealed, in position
permissible.
No screened cable may be used in protec-
tion area 1.
Accessories for operating a HDE
electronic with pre-heated water
– Central thermostatic fitting ZTA 3/4
Order No. 07 38 64
The central thermostatic fitting installed
directly above the storage unit ensures, by
adding cold water via a bypass line, that the
output temperature of 60 °C will not be
exceeded.
Service monitor
Order No. 16 77 41
Diagnostic unit for fault recognition in the
HDE electronic.
Universal installation frame
Order No. 07 37 90
With rear wall and electrical wiring.
This module creates a hollow space be-
tween the rear wall of the unit and the
installation wall. This allows for a concealed
electrical connection to be fitted at any
desired point behind the unit. The depth of
the unit is increased by 30 mm. The protec-
tion mode will be changed by the addition
of the module, to IP 24 (spray water pro-
tected).
Pipe module offset installation
Order No. 07 39 17
Pipe module offset installation, including
universal installation frame, Order -
No. 07 37 90. Vertical displacement of the
unit in relation to the water connection by
90 mm downwards. The depth of the unit
will be increased by 30 mm. The protection
mode will be changed by the addition of
the module, to IP 24 (spray water pro-
tected).
Pipe module installation below
working surface
Order No. 07 05 65
Connections: Surface installation, G 3/8,
top.
.
(a) is
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