Notes For Operators - Wagner & Co RATIOfresh 250 Technical Information Installation Instructions

●
Hot water with the temperature indicated in column 3
must be available at minimum in the auxiliary heating
section of the buffer cylinder in order to reach the de-
sired flow temperature with the indicated maximum tap-
ping volume flow. Select from the listed auxiliary heating
temperatures.
●
The volume flow indicated in column 4 must be pumped
through the heat exchanger in the primary circuit in or-
der to reach the nominal hot water temperature. The
heating water is cooled in the heat exchanger to the tem-
perature listed in column 5 and then supplied to the
lower buffer cylinder section.
●
Manually set the pump level (max – med – min) from
column 7.
●
Adjust the set value "wMax. tap volume" in menu "hot
water" (Tab. 7). Select the regularly occurring max. vol-
ume flow. It should be significantly lower than the maxi-
mum volume flow for the heating of which the pump is
set. Generally the tapping volume interval is divided into
10 time slots. For each time slot an internal control value
is adapted during the adaptation process. An unfavour-
ably chosen maximum tapping value can therefore re-
duce the controller performance. The actual maximum
performance of the unit is not affected by the settings.
5.5 Setting the Auxiliary Heating
Temperature at the Heating Boiler
The value you determine for the aux. heating temperature
of the heating boiler corresponds with the standby tempe-
rature in the buffer storage tank or the required tempera-
ture in the primary flow of the RATIOfresh station.
This nominal temperature for the primary flow is listed in ta-
ble 14 and depends on the selected max. tapping volume
and pump level. Several combinations comprised of "Pri-
mary Flow Temperature", "Primary Return Temperature",
and "Pump Power Level" are available to you for the individ-
ual weighting.
5.6 Perform Controlled Tapping
The RATIOfresh has an automatic adjustment function to
ensure the desired temperature is always available regard-
less of the tapping volumes. A single-jet meter in the cold
water supply measures the volume and passes the value to
the controller in % of the "Max. Tap Volume". The selected
tapping volume range is divided into 10 equal tapping time
slots. When different volumes are withdrawn within the set
range, the controller "learns" to deliver the desired temper-
ature in each of the 10 tapping slots. The current tapping
volume range can be displayed in the info level of the con-
troller in the menu item "Tapping/Area".
To optimally adjust the hot water temperature to different
tapping volumes, a controlled tapping should be per-
formed when initially starting up the system. Please follow
these steps and adhere to the described sequence of
these steps:
1. First, select the menu item "Tapping/Area" in the info
level of the controller.
2. Open a hot water tap until the display depicts "### % /
02".
20
3. After approx. 30 seconds, the controller starts to adjust
the hot water temperature to the desired temperature.
Select the menu item "Hot Water Temp." in the info level
of the controller and wait until the set nominal tempera-
ture has been reached.
4. Then select once more the menu item "Tapping/Area"
and now continue opening the hot water tap until the
display depicts "### % / 03". Now the adjustment starts
already after 10 seconds.
Return to the "Hot Water Temp." menu and wait until the
hot water temperature has reached the set nominal
value.
5. Continue with the remaining 7 tapping slots in this man-
ner.
If during controlled withdrawl no sufficient volume flow is
available, the adaptation values of the tapping slots that
were not reached can also be set manually. For this pur-
pose use the sub-menu "adaptation values" (Tab. 11). The
required service code is available upon request.
At the end of the controlled tapping, the controller delivers
the desired temperature with small as well as with large
volumes of water being withdrawn.

6. Notes for Operators

After professionally trained and qualified service techni-
cians performed the initial startup, your freshwater station
is triggered automatically to heat your potable water when
hot water is withdrawn from the system. No other control
steps are necessary if the system is operated as intended.
Please note the following points:
Nominal Hot Water Temperature
The nominal temperature of the hot water can be preset on
your freshwater station. Please follow the recommended
steps of this manual.
Energy-Saving Operation
The pump level should be set as low as possible; the same
applies to the nominal aux. temperature in the buffer cir-
cuit. Consult table 14.
Malfunctions and Defects
Please report any malfunctions and defects immediately to
a trained and qualified service technician!
Maintenance and Care
As with any other technical equipment, your freshwater sta-
tion must be serviced and maintained regularly by trained
and qualified technicians. If you have very "hard water" the
heat exchanger must be checked for lime buildup and
cleaned as needed. Consult Chapter "Maintenance and
Care" for additional information.
Placing System in/out off Operation / Vacation
While you are on vacation or during times when hot water is
not needed, we recommend de-energizing the freshwater
station by unplugging it from the mains power network to
avoid any unnecessary electricity consumption.
EN-RATIOfresh-250-400_TI-MA-0809-11214900