eta 13180LP-T, Operation

Page: 52 / 88

52 www.eta.co.at
[Fresh water module] function block ETAtouch controller
5.6 [Fresh water module] function
block
Fresh water module overview screen
1 Operating condition and information.
A description of the operating conditions can be
found in the integrated Help menu by pressing the
button.
2 Producer for the fresh water module.
Currently, the fresh water module is charged by the
buffer at a flow temperature of 58 °C.
3 Primary side return temperature
4 Circulation pump (only displayed if it has been
installed and is in operation)
5 Hot water temperature (the tap is displayed only
when hot water is currently being drawn)
6 [Settings] button.
In this menu, the time window can be set, for
example.
Function of the fresh water module
The desired hot water temperature is set with the po-
tentiometer on the fresh water module. If in the config-
uration the [Target value can be set with rotary knob]
option has been disabled, different time windows and
hot water temperatures can be set. See chapter on
5.6.1 "Setting the hot water charging times" .
Inside these time windows, the upper part of the buffer
is maintained at no lower than the configured hot water
temperature. Outside the set time windows, the hot
water is maintained at the lowest set temperature of
the time windows, provided that the accumulator tank
is sufficiently hot.
If an additional circulation pump for hot water is
installed, the different operating modes for this
pump are set in the same way. See the following
description for this.
Operating modes for the circulation pump
There are two ways to operate the circulation pump.
Either through automatic detection of the operating
times ("self-learning" function, often referred to as
"auto loop") or manual specification of the operating
times (set time window).
• "Self-learning" function:
This is already set at the factory (= parameter [Self-
learning] to [Yes]). The hot water tappings of the
past 2 weeks are stored for automatic determina-
tion of the daily operating times. On the basis of
this, the operating times of the current day are
calculated and the circulation pump is started in a
timely manner.
In this operating mode, the circulation pump starts
as soon as hot water is drawn (detected by the flow
sensor in the fresh water module). The pump will
then run for a while and subsequently pause.
These runtimes and pauses are configurable
(=parameter [Circulation runtime] and [Circulation
pause]).
After commissioning, no more data is
available for the "self-learning" circulation.
That is why an operating period of about 4 weeks
is required in the beginning, so that the control
system can save sufficient data.
• Setting a time window:
To do this, the "self-learning" function must be
switched off (= parameter [Self-learning] to [No]).
The operating times of the circulation pump are
now set manually, for example from 10:00 am to
2:00 pm . Within these time windows, the
circulation pump alternately starts and pauses,