Description
Information for installation
11
Hydraulic connection of the fresh water module
The schematic representation also contains the
optionally available circulation set. A bleed valve with
sufficient dimensions must be installed at the highest
point of the flow line from the buffer to the fresh water
module.
Fig. 3-7: Hydraulic connection
Required software version
The configuration of the fresh water module "33"
requires the software version X.35.7 or X.41.0 or
higher. An update must be performed first if a lower
version is installed.
The fresh water module "44" requires the
software version X.46.0 or higher. A configuration
with the previous software interface (up to X.35.X) is
therefore not possible. But the fresh water module
works independently, even without a CAN-bus
connection to the ETAtouch control.
3.4
Information for installation
Hydraulically uncoupling the fresh water module,
only installing a solenoid valve in exceptional
cases
Ideally, separate piping must run between the fresh
water module and the buffer and this should
not
be
integrated in the flow between the heat producer and
the buffer.
However, if this is not possible, then a solenoid
valve (230 V, Kv value > 7) must be installed in
the boiler water return line of the fresh water module.
This opens only if hot water is required and prevents
the plate heat exchanger from being heated up unin-
tentionally by the boiler pump (the pump from the heat
producer to the buffer).
The solenoid valve is connected to the circuit board
[EM-C] at the terminal [S102 LZ]. The ouput of the
buffer pump from the fresh water module must then be
duplicated, i.e. additionally assigned to the terminal
[S102 LZ] on the circuit board [EM-C]. This
assignment is only possible for systems with an
ETAtouch control panel.
Take the line resistance of the hot water installa-
tion into account.
The "WILO - Yonos Para-Z" pump installed in the
optional circulation set is dimensioned so that in con-
ventional installations a sufficient flow rate is achieved
(see pump curve).
The flow sensor of the fresh water module is
dimensioned for a flow rate of 2 - 40 l/min. But if
less than 1 l/min hot water is used, it could be that the
flow sensor is not responding and thus the circulation
is not starting. For this reason, the line resistance of
the hot water installation must be checked during in-
stallation. If required, the operating mode of the
circulation pump can be adjusted (see
).
Practical example:
At 0.24 m³/h feed capacity (4 l/min), an installation with
a new aluminium interconnector (16 x 2.2 mm, 20 m
length, 6 fittings) has a line resistance of approx.
1.60 mWs. This roughly corresponds to the pump
characteristic of the circulation pump at the "constant
speed" setting, just below Stage II (see characteristic
curve
Fig. 7-3: ""Constant speed" characteristic
). In this setting, the pump needs approximately
18 W of power.
If the circulation does not work, check the following
points:
•
Were the pipelines purged?
•
Is circulation even possible? (blocked lines,
crushing, pressed in protective cap ...)
