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6.
Mounting
6.1
Connection of Water Piping
The nominal pipe widths of the field-installed sanitary installations must be selected on the basis of the avail-
able water pressure and the expected pressure drop within the piping system.
The water-side installation has to be executed in compliance with DIN 1988 (see appendix – in the case of
excessive water pipe pressure, a pressure relief valve is to be provided, among other things!)
The water pipes may be of the rigid or flexible type. To prevent corrosion damage, make sure that the mate-
rials used in the piping system are compatible (see section Commissioning).
Caution!
When installing the pipework on the customer's site, any contamination of the piping
system must be avoided (pipes may have to be flushed prior to the connection of the
HPWH)!
6.2
Connection of Condensate Line
The condensate hose is passed through the rear panel of the unit. It must be routed in such a way that any
condensate which may collect can drain without any obstruction. When the unit is delivered, the condensate
hose is passed through the bottom of the rear panel and can thus be used for condensate drainage near
ground level. For condensate drains located at a higher level, the condensate hose can be routed through
the upper opening (Fig. 1). With this type of routing it is imperative that a minimum height difference of
260 mm be maintained between the condensate hose outlet opening (on the unit) and the condensate hose
end (e.g. in a siphon).
At the end of the condensate hose a sealing lip valve (that opens without pressure) is provided which must
also be relocated when the condensate hose is shortened (valve can be easily removed and reinstalled on
the hose).
6.3
Electrical Connection
The HPWH is pre-wired, ready for connection, the power is supplied via the mains cable connected to a wall
outlet with earthing contact (~230 V, 50 Hz). This outlet must be accessible also after the installation has
been completed.
For the control of external devices for the supplementary heat source, a separate wire must be fed into the
unit. For this purpose, the HPWH must be opened as described under 6.3.1. The cable must also be passed
through the partition in that it is guided through a free cable bushing provided for this purpose. The terminal
(X5 – 4/5/PE) with a potential-free contact for the control (ON/OFF) of the external ancillary equipment
(pump, solenoid valve, etc.) is located on the partition inside the unit. The cable must be inserted into the
provided strain relief (Fig. 5) and secured.
External immersion heater control
As an option, it is possible to configure the immersion heater in such a way that in addition to the activation
by the "immersion heater" switch on the operating panel on the HPWH it is also possible to activate the elec-
tric heating element remotely (e.g. by using a timer). A potential-free contact on the external switchgear must
be available for this connection; in addition, another wire (min. 2 x 1.0 mm
be introduced into the unit and clamped to terminals 6 and 7 of terminal strip X5.
Fig. 8: Terminal in the appliance
X5
X3
2
/ max. outside dia. 10 mm) must
( X3 – only internal wiring )
X5 (4 + 5) Terminal, potential-free contact
for supplementary heat source
X5 (6 + 7) Terminal for external immersion
heater control (option)
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