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Commissioning
7
Commissioning
Monitoring the screw joints
Due to vibration and thermal expansion, all screw
joints must be inspected and tightened prior to
commissioning.
Bleeding before commissioning
The fresh water module must be ventilated before
commissioning. For ventilation, there is a ventilation
screw on the top of the fresh water module.
Fig. 7-1: Bleed screw
The option [Automatic venting] has been enabled
at the factory. In this way, the controller
recognises the introduction of air into the heat
exchanger and tries to remove it with the help of both
pumps. This can also take place multiple times one
after the other.
If, however, the water is still not sufficiently warm, there
is still air in the plate heat exchanger and manual
venting is needed. To do this, carry out the following
steps.
Venting the fresh water module
1. Open the hot water tap in the drinking water
network so that the fresh water module pumps
start.
2. After about 15 seconds, close the hot water tap
again.
3. Open the vent screw in the fresh water module and
allow the air to escape.
4. Then open the hot water tap once more and carry
out the steps again. Carry on doing this until no
more air escapes from the fresh water module.
Mounting the plastic cover
Reattach the plastic cover following commissioning.
Pull off the protective film and affix the ETA logo in the
corresponding recess.
Adjusting the speed of the circulation pump
By default, the circulation pump is set to "Constant
Speed" in the "III" position. If required, the operating
mode "differential pressure variable (Δp-v)" (left scale
on the rotary knob) can also be set.
Fig. 7-2: Factory pump settings
Using the current flow rate (readable in the text menu
of the ETAtouch control) and the pump curve (see
pump characteristics), the speed of the circulation
pump can be adapted to the customer's requirements.
We recommend adjusting the pump so that a flow
rate of approximately 4 l/min is achieved. A
minimum flow of 2 l/min must be guaranteed for the
flow sensor to trigger.
Thermal valves for the circulation line are actually
not required, because the circulation pump shuts
down in time by means of the return sensor. If there are
several strands available for the circulation line and
thermal valves are installed in these, at least one
strand must always remain open (the longest strand, if
possible) so that circulation can occur.
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