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5. Electrical connection
Only connect the unit to AC voltage according to the
specifications on the type plate.
It is recommended to provide a separate circuit
for the instantaneous water heater.
IHW 35
Replace the upper part of the housing and screw it
tight. The instantaneous water heater is factory-
equipped with a mains cable with plug.
Make sure that the socket is always accessible.
IHW 55
Insert the supply cable through the cable entry on the
rear wall of the unit, relieve the strain and connect it to
the terminal block:
Replace the upper part of the housing and screw it
tight.
6. Water connection
ATTENTION!
The maximum water pressure indicated on
the type plate must not be exceeded. If a
backflow preventer is installed in the water
inlet, then a safety valve must be installed
between the instantaneous water heater and
the backflow preventer.
NOTE
Observe the regulations of your water supply com-
pany and DIN 1988.
For the complete connection diagram, see page 6.
The unit can be used for heating cold water in pres-
surised or unpressurised operation.
Place the dirt filter with flow reducer (A) on the
cold water inlet connection.
Screw on the connection adapter (B).
Fit the sealing rings (C).
Make the water connection (D).
EN-4
NOTE
Each unit is supplied ex works with a jet former that
determines the flow rate. It is matched to the respec-
tive unit output and must always be fitted to the outlet
of the water fitting instead of the existing jet former.
7. Initial commissioning
NOTE
Before plugging in the mains plug or before switching
on the fuse, be sure to bleed it.
Open the water inlet and check the connections
for leaks.
Open the hot water valve completely for 15 to 30
seconds. The water jet must emerge evenly and
without bubbles.
Close the hot water valve.
Plug in the mains plug, switch on the fuse.
Check the function of the unit.
8. Operation
The instantaneous water heater operates fully auto-
matically.
The maximum adjustable outlet temperature depends
on the flow rate and the temperature of the incoming
cold water.
NOTE
The maximum outlet temperature must not exceed
55°C. There is a risk of rapid calcification.
2105/A
IHW 35, IHW 55
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