Safety valve
The appliance is a sealed unvented DHW cylinder. Provide the
appliance with a pressure relief valve.
Install a type-tested safety valve in the cold water supply
line. The response pressure of the safety valve must be below
or equal to the permissible operating pressure of the DHW
cylinder.
The safety valve protects the appliance against unacceptable ex-
cess pressure. The diameter of the cold water supply line must be
no greater than the diameter of the safety valve.
Ensure that the expansion water escaping from the safety
valve can drip into a drain, e.g. a tank or funnel.
Ensure the drain cannot be shut off.
Size the drain so that water can drain off unimpeded when
the safety valve is fully opened.
Ensure that the discharge pipe of the safety valve is open to
the atmosphere.
Fit the discharge pipe of the safety valve with a constant
downward slope and in a room free from the risk of frost.
Pressure reducing valve
Bear in mind that, depending on the static pressure, you may also
need a pressure reducing valve.
DHW circulation
DHW circulation is not recommended for reasons of poor energy
efficiency. If DHW circulation is required due to unfavourable pi-
pework or for reasons of convenience, you must install the DHW
circulation in accordance with applicable standards. To reduce
pump runtime and energy demand, we recommend imposing time
and temperature controls on activation of the circulation pump.
A DHW circulation pipe kit and circulation pump can be found in
our range of accessories.
5.6 Filling the DHW cylinder
The DHW cylinder can be filled via the cold water inlet connection.
Open one or more hot water draw-off points to fill the DHW
cylinder.
Close the hot water draw-off points once the cylinder is full.
5.7 Option: Connecting the second DHW cylinder
XD04-TX : Connect the temperature sensor for the second
DHW cylinder. See chapter „Electrical connection/ Connec-
ting sensors“. The temperature sensor must be type Pt1000.
5.8 Condensate drain and overpressure valve
Check the position of the internal condensate pump in the
function module. The condensate pump must fully rest on the
floor.
D0000077842
1
2
1 Safety valve drain
2 Condensate drain
On its r.h. side, the appliance is equipped with a condensate drain.
Connect a condensate drain pipe to the condensate drain.
!
Material losses
To ensure the condensate drains off correctly, never kink
the condensate line. If necessary, create a loop.
Route the condensate line with a sufficient fall.
Route the condensate into a floor drain. When doing so, ensure the
drain is adequately ventilated, e.g. free discharge into a siphon.
Use a condensate pump if there is insufficient fall.
If using a condensate pump, ensure that it delivers at least
6l/min.
Pressure relief valve drain
On the r.h. side of the appliance, the safety valve drain connection
also routes the pressure relief valve discharge hose out of the
casing. Ensure that draining water can run off freely.
5.9 Electrical connection
WARNING Electrocution
Only qualified electricians may carry out the connection
in accordance with these instructions. Carry out all elect-
rical connection and installation work in accordance with
national and regional regulations.
WARNING Electrocution
Disconnect the appliance from the power supply before
carrying out work on the control panel.
WARNING Electrocution
The connection to the power supply must be in the form
of a permanent connection. The appliance must be able
to be separated from the power supply by an isolator
that disconnects all poles with at least 3mm contact
separation. This requirement can be met by using con-
tactors, circuit breakers, fuses/MCBs, etc.
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