Installation
Circulation set
19
To attach the joint, push the bracket into the recess on
the housing.
Fig. 4-20: Attaching the joint
Running piping to the safety valve
A safety valve with 10 bar opening pressure has
already been installed on the circulation set at the
factory.
Fig. 4-21: Safety valve
Position the outlet of the safety valve so that no
leaking water can drip onto the pump. Therefore,
guide the outlet with a pipe to the ground or drainage
system (e.g. sewer). A freely visible, open flow path
(e.g. siphon funnel) during the procedure allows a
visual check to determine whether the safety valve is
dripping.
Dripping safety valve due to pressure surges and
thermal expansion
When running a hot water circulation, the water is
heated in a closed system and expands. The check
valve in the cold water inlet prevents water expansion
in the cold water pipe. The safety valve prevents
excessive pressure in the system and thus protects the
fresh water module or installation. This is why it is
possible that the safety valve opens a little and begins
to drip. Similar to a pressure-free under-counter
storage tank or a hot water tank.
If the water installation is designed with rigid pipes and
narrow diameters (such as 15 mm CU or 1/
2" galvanised, for example), then pressure surges are
to be expected.
In order to protect all components against
pressure shocks, we recommend fitting a small
diaphragm pressure expansion vessel (for example,
8 litre version suitable for drinking water) in order to
absorb the pressure shocks in the hot water pipe. This
expansion tank also avoids a leaking safety valve.
The pressure expansion vessel for the hot water
pipe must comply with the country-specific
hygiene standards.
Connecting the hot water pipe
Connect the hot water pipe for the circulation.
Fig. 4-22: Connecting the hot water pipe
Do not use thermally regulated pumps for hot
water circulation
If the ETA circulation set is not used but instead
an external circulation set is installed, you may
not use thermally regulated pumps. Because this will
switch off when the return gets too warm, then the
"self-learning" function (often called "Auto Loop") will
not work properly for the fresh water module.
