23
All safety-related components must be integrated into the system in such a
way that their function and leaktightness can be checked at any time. The
thermal discharge safety device water drain should be designed in such a
way that it can be inspected at any time (e.g., via an open drain with siphon
trap).
The cold water pipe should be flushed through before first using the system.
This will flush out any dirt that could interfere with the closing of the thermal
discharge safety device. The instructions and information provided by the
manufacturer of the thermal discharge safety device must be observed.
2.9.4 THERMAL PUMP CONTROL ambiente a4 H
2
O
A thermostatic switch (e.g. Afriso) is located in the bottom compartment for
optimum control of the circulating pump. This ensures that the circulating
pump will start up only when the water reaches the specified temperature
(>60°C). It is possible for the pump to be controlled via the boiler control
system or similar devices if the pump switches on when the temperature
exceeds 55°C. The maximum contact rating of the factory-fitted pump ther-
mostat is approx. 16 (4) A with a 250 V AC system.
The thermostat is factory-set to a temperature of approx. 62°C. The circu-
lating pump or the load unit will thus be switched on or off if the temper-
ature reaches or drops below the specified water temperature of approx.
60°C in the ambiente a4 H
2
O’s water heat exchanger. As an option, the
temperature can be adjusted by the installation contractor if circumstances
demand. This is done by adjusting the circular disc or removing the top
cover, according to the thermostat version. The temperature range can be
altered after removing the cover.
Please note:
At water temperatures below 60°C there is a greater risk of
falling below the dew point. This can cause tarry soot to form. Also, cleaning
becomes necessary much more often. We therefore recommend setting the
temperature at which the pump switches on to a minimum of 60°C and a
maximum of 70°C.
2.9.5 ELECTRICAL CONNECTION
The entire electrical installation of the individual components of the heating
system must be carried out by an authorised specialist contractor. All work
must be carried out in accordance with VDE regulations (e.g., VDE 0105,
VDE 0116, VDE 0100, etc.) and the local electricity supplier’s technical
connection conditions.
The only work required on the ambiente a4 H
2
O is the electrical installation of
the thermostat for the load unit pump (refer to section „2.9.7 Load unit (heat
charger) in the ambiente a4 H
2
O stoves“ on page 26) and connection to
the domestic electricity supply. The temperature-resistant connecting lead is
approx. 3.0 m long and is already connected up inside the thermostat.
The blue wire, the switched
phase (L‘) is wired as phase to
the circulating pump or load unit.
The green-and-yellow wire is
wired to the earth conductor
(ground) (PE) of the mains
cable.
The brown wire is wired to the
phase (L) of the mains cable.
Fig. 13a
