24
Installation
11.2 Recommissioning
Vent the appliance and the cold water inlet line (see chap-
ter «Settings»).
See chapter «Commissioning / Initial start-up».
12.
Shutting down the system
» Isolate all poles of the appliance from the power
supply.
» Drain the appliance (see chapter «Maintenance»).
13. Troubleshooting
Fault
Cause
Remedy
The flow rate is too
low.
The strainer in the ap-
pliance is dirty.
Clean the strainer.
Flow meter will not
start despite tap being
fully opened.
The start-up volume
required to start up
the heating output has
not been reached.
Clean the strainer.
The appliance is not
generating hot water
despite audible sound
of the differential pres-
sure switch starting.
Safety pressure limiter
(AP 3) has switched
the appliance off for
safety reasons.
Remove the cause of
the fault (e.g. faulty
pressure washer).
Protect the heating
system against over-
heating by opening a
draw-off valve down-
stream of the appli-
ance for one minute.
This depressurises
and cools down the
heating system.
Activate the safety
pressure limiter at flow
pressure by pressing
the reset button (see
chapter "Commission-
ing").
The heating system is
faulty.
Check the heating
system resistor, and
replace it if required.
14.
Maintenance
WARNING Electrocution
Before any work on the appliance, disconnect all
poles from the power supply.
Draining the appliance
The appliance can be drained for maintenance work.
WARNING Burns
Hot water may escape when draining the appliance.
» Close the shut-off valve in the twin connector or the
cold water inlet line.
» Open all draw-off valves.
» Undo the water connections on the appliance.
» If dismantled, store the appliance in a room free from
the risk of frost, as water residues remaining inside
the appliance can freeze and cause damage.
Cleaning the strainer
26
_0
2_0
2_0
94
9
If dirty, clean the strainer in the threaded cold water fitting.
Close the shut-off valve in the cold water inlet line before
removing, cleaning and refitting the strainer.
15.
Specification
15.1
Dimensions and connections
395
100
485
325
45
5
93
226
190
50
112
190
35
c01
c06
b02
D
00000
17
75
7
b02 Entry, electrical cables I
c01 Cold water inlet
Male thread
G 1/2 A
c06 DHW outlet
Male thread
G 1/2 A
Alternative connection options
325
50
50
35
40
b03
b02
b04
b04
b04
D
00000
19
77
8
b02 Entry, electrical cables I
b03 Entry, electrical cables II
b04 Entry, electrical cables III
