STIEBEL ELTRON DHA 4/8 L Gebrauchs- Und Montageanweisung Seite 6

1. Operating instructions
1.1 Description of the unit
The DHA 4/8 L hydraulically-controlled small
instantaneous water heater heats the water
while it is flowing through the unit. The
heating system in the unit switches on from a
flow volume of > 2,9 l/min.
1.2 The most important
points - in brief
1. Set the heating capacity at the selector
switch (1)
Stage •
Reduces the hot water
outlet temperatures
Stage ••
Full hot water outlet
temperature
2. Open hot water fitting on the fitting
The unit will heat up; display
"Power" (2).
1.3 Operating
"Overheating" light (3) on:
This means the unit is reducing the power
because of an excessively high inflow
temperature. Once it has cooled down, the
unit will automatically switch the heating
power back on.
The basic power rating, set by a qualified
installer (selectable: 8,8; 6,6; or 4,4 kW at
230 V), the cold water inlet temperature, and
the flow volume at the fitting, are the factors
2. Installation instructions
2.1 Description of the unit / unit
structure
The Stiebel Eltron DHA instantaneous water
heater is a hydraulically-controlled pressure
unit for hot water supply to one or more
draw-off points.
1 Selector switch for heating capacity
2 Power" light: Unit is heating up
3 "Overheating" light: Outlet temperature
> 65 °C
4 Terminal strip for electrical connection
5 Cable bushing for electrical connection
cable, concealed and visible
6 Safety thermal cutout with reset push
button
7 Differential pressure switch
8 Flow rate adjustment screw
9 Terminal strip with terminal bridges for
power rating selection
10 Cold water connection G ½, surface
installation
11 Hot water connection G ½, surface
installation
12 Cold water connection G ½, concealed
installation
13 Hot water connection G ½, concealed
installation
14 Fixing position
15 Filter
16 Reset button for differential pressure
switch
6
for the user and the qualified installer
which determine the outlet temperature. If
the outlet temperature is too low, set the
selector switch to Stage ••, or reduce the
flow rate.
Table 1 (on page 2) shows the temperature
rise at the individual power ratings, as a
function of the flow rate. If these values are
added to the cold water temperature
prevailing at the place of installation, the hot
water outlet temperature in each case can be
obtained.
Example:
Basic power setting
Flow rate
Temperature increase
Cold water inflow
Hot water outflow
Table 2: What do you do if . . . ?
Fault Cause
No hot water – Unit is not heating up.
despite the hot
water fitting being
The flow rate of > 2,9 l/min.
fully opened.
required for the system to switch
on is not being attained.
– Dirt contamination or limescale
formation in the flow regulator
in the fitting or in the shower
head.
for the qualified installer
2.2 Technical data
Type DHA 4/8 L
Design type Closed
Capacity 0,5 l
Rated pressure 10 bar
Weight 2,5 kg
Protection class as
per IEC 335-1
Protection mode
as per IEC 529 IP 24
Test marking See unit rating plate
Water connection G 1/2 (external thread)
Electrical
connection 1/N/PE ~ 220 . . . 240 V
Rated power kW
at 220 V 8,0
at 230 V 8,8
at 240 V 9,6
Use Over-sink unit for the
supply of one or more
draw-off points.
Switch-on flow rate > 2,9 l/min
Switch-on flow pressure
(pressure drop) 0,3 bar
at flow rate 2,9 l/min
Suitable for
cold water up to 25 °C
1.4 Important notes
All the information in these
instructions for operation and
installation must be followed carefully.
They provide important information
regarding safety, operation, and
maintenance of the unit.
1.5 Care and maintenance
A damp cloth is sufficient to clean the unit.
Do not use any foaming or abrasive cleaning
agents!
8.8 kW
4 l/min Maintenance work may only be
32 °C carried out by a qualified installer.
10 °C
1.6 What do you do if . . . ?
42 °C
See Table 2.
2.3 Specifications and
provisions
– The specifications and provisions of the
local energy supply company and the water
supply company concerned are to be
respected.
2.4 Important notes
– Make sure the data on the unit rating plate
is current
– Install the unit so that it is flush with the
wall
– Material for the water installation:
Steel, copper, or plastic piping systems.
If plastic piping systems are being used, the
following instructions are to be respected:
In the event of a fault, the following loads
may occur in the installation:
kW kW
– Temperature: max. 95 °C
6,0 4,0
– Pressure:
6,6 4,4
– Electrical connection to securely fixed lines
7,2 4,8
only.
– The unit must be capable of being isolated
from the mains, for example by fuses, with
an isolated distance of at least 3 mm.
The unit must be connected to the
protective earth conductor (see
electric circuit diagram).
– Fittings for open units are not permissible.
– A safety valve is not required.
Rectification
– Check the fuses and replace
them if necessary.
– Cleaning or descaling the flow
regulator in the fitting or in the
shower head.
max. 10 bar