Wagner & Co RATIOfresh 250 Manual

TECHNICAL INFORMATION / INSTALLATION INSTRUCTIONS Wagner & C
o
RATIOfresh Freshwater Station 250/400
Hygienic Water Heating
A continuous flow process is used to heat potable water
quickly and on demand to a preset temperature.
Excellent Performance
The RATIOfresh 250 unit delivers hot water at up to 25 l/
min. The larger station RATIOfresh 400 even reaches a tap-
ping capacity of 40 l/min and thus is suitable for multi-fam-
ily homes with up to 20 individual apartments.
Functional Design
A modern powder-coated metal casing houses all compo-
nents in a compact design.
Adaptive Microprocessor Controlling
The microprocessor “learns“ the water withdrawal patterns
of users. This means the freely selectable hot water temper-
ature can be maintained precisely even with fluctuating
flow or inlet temperatures within the primary circuit. This
also offers various options of regulating hot water
circulation.
Easy Assembly and Maintenance
The station is suitable for mounting on the wall or the stor-
age tank (in conjunction with all RATIO buffer cylinders and
the additionally available tank expansion kit). Flat sealing
connections simplify assembly and installation as well as all
service tasks. After the hydraulic integration, the ready-to-
plug-in station can be operated immediately as delivered.
Numerous Application Options
The freshwater station can be combined with almost any
heat source. Oil, gas, wood logs and pellet boilers are as
suitable as a solar installation or local or district heating dis-
tribution systems. All it takes is a buffer cylinder whose ther-
mal stratification is supported by minimal return tempera-
tures within the primary circuit.
Protection from Legionella Pneumophila Bacteria
If required, the hot water and the circulation piping net-
work can be thermally disinfected. Time, temperature, and
duration of the disinfection process are individually
adjustable.
Content
1. Technical Information .................2
1.1 Technical Data ......................2
1.2 Scope of Delivery ....................3
1.3 Accessories .......................3
2. Safety Information ...................6
2.1 Operator Qualifications ................6
2.2 Intended Use ......................6
2.3 Standards and Guidelines ...............7
2.4 Installation Recommendations ............7
3. Installation ........................8
3.1 Prior to the Installation .................8
3.2 Wall Mounting ......................8
3.3 Storage Tank Mounting ................8
3.4 Connecting Potable Water ...............9
3.5 Connecting Circulation .................9
3.6 Installing the Primary Circuit .............10
3.7 Switching the Primary Return Flow ..........11
3.8 Connecting the Controller ..............11
3.9 Closing the Housing ..................11
4. Controller Operation .................13
4.1 Controller Displays ..................13
4.2 Controller Settings...................13
4.3 Controller Setting Tables ...............14
5. Initial Startup......................19
6. Notes for Operators..................20
7. Maintenance and Care ................22
8. Troubleshooting....................23
9. System Solutions – Example .............27
Figure 1 RATIOfresh Freshwater Station 250/400.
Solar Thermal / Solar Cylinder EN-RATIOfresh-250-400_TI-MA-0809-11214900 1

2EN-RATIOfresh-250-400_TI-MA-0809-11214900
1. Technical Information
1.1 Technical Data
Table 1 Technical Data
Feature RATIOfresh 250
Variation Copper soldered heat exchanger Stainless steel soldered heat exchanger
Order no. 150 300 65 150 301 77
Nominal tapping capacity
10 °C →45 °C (sec.)
10 °C →60 °C (sec.)
25 l/min
61 kW
87 kW
Coefficient of performance (NL)
10 °C →45 °C (sec.), 82 °C (prim.) acc. to DIN 4708 T3
10 °C →60 °C (sec.), 85 °C (prim.)
10 °C →60 °C (sec.), 75 °C (prim.)
NL=13
NL=11
NL=7
Nominal hot water temperature 25 – 70 °C
Circulation return 5 – 70 °C/5–25K
Pressure loss, Dp secondary < 370 mbar (with 25 l/min)
Voltage supply 230V/50Hz
Fuses
Operating voltage 230 V, control fuse 100 mAT / 250 V, power fuse 2 AT/250 V.
To replace internal fuses, de-energize the device, remove the screws on the
controller, and lift off cover (fig. 8, 9, 10).
Dimensions of housing (HxWxD) 940x350x181mm
Color (powder-coated) Upper section: RAL 7035 (light gray)
Bottom section: RAL 7021 (black-gray)
Max. permissible pressure 6 bar (primary), 10 bar (secondary)
Max. permissible temperature 95 °C (primary and secondary)
Capacity of water space 1.1 l (primary) / 1.2 l (secondary)
Max. electrical power consumption / standby
operation mode 2 x 200 W (when connecting two pumps) / 0.6 W
Protection class IP 44
Weight 26 kg

EN-RATIOfresh-250-400_TI-MA-0809-11214900 3
1.2 Scope of Delivery
Table 3 Delivery Scope
Freshwater station, ready for plug-and-play, 4 dowel sets for wall
mounting; 4 solder connection sets LT 22-1; installation
instruction
1.3 Accessories
Table 4 Accessories
Item Order no.
Solder connection set
LT 28.1 ¼“, swivel nut,
gasket and solder connection 22mm
139 000 44
Threaded connection set
GT 1 ¼“, swivel nut,
gasket and threaded connection
130 100 88
RATIOfresh RS 232 PC interface cable 150 400 22
Cylinder mounting kit for CIRCO 139 000 28
Motor actuated 3 way valve 1“ M 160 101 44
Motor actuated 2way ball valve 819 201 33
Table 2 Technical Data
Feature RATIOfresh 250
Variation Copper soldered heat exchanger Stainless steel soldered heat exchanger
Order no. 150 300 66 150 301 78
Nominal tapping capacity
10 °C →45 °C (sec.)
10 °C →60 °C (sec.)
40 l/min
98 kW
139 kW
Coefficient of performance (NL)
10 °C →45 °C (sec.), 82 °C (prim.) acc. to DIN 4708 T3
10 °C →60 °C (sec.), 85 °C (prim.)
10 °C →60 °C (sec.), 75 °C (prim.)
NL= 19,5
NL=17
NL=11
Nominal hot water temperature 25 – 70 °C
Circulation return 5 – 70 °C/5–25K
Pressure loss, Dp secondary < 490 mbar (with 40 l/min)
Voltage supply 230V/50Hz
Fuses
Operating voltage 230 V, control fuse 100 mAT / 250 V, power fuse 2 AT/250 V.
To replace internal fuses, de-energize the device, remove the screws on the
controller, and lift off cover (fig. 8, 9, 10).
Dimensions of housing (HxWxD) 940x350x181mm
Color (powder-coated) Upper section: RAL 7035 (light gray)
Bottom section: RAL 7021 (black-gray)
Max. permissible pressure 6 bar (primary), 10 bar (secondary)
Max. permissible temperature 95 °C (primary and secondary)
Capacity of water space 1.6 l (primary) / 1.2 l (secondary)
Max. electrical power consumption / standby
operation mode 2 x 200 W (when connecting two pumps) / 0.6 W
Protection class IP 44
Weight 28 kg

4EN-RATIOfresh-250-400_TI-MA-0809-11214900
940
570
240
100
110
181
Side view
4Primary
flow
5Primary
return
1Controller
2-Heat ex
changer
85
57
80
ø55
ø55
181
350
80
7Hot water
6Cold water
9Single-jet meter
3Circulation pump
10 Housing
8Circulation
Frontal view
Top/bottom view
Drill pattern
64 32
254
521
827
70
Figure 2 RATIOfresh freshwater station viewed sectionally, with dimensions and drilling template.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 5
Figure 3 Cross-section of RATIOfresh freshwater station with dimensions and drill hole pattern (page 4)
1Adaptive microprocessor control to regulate hot water and circulation,display 2 x 16 characters, plastic foil keypad with 3 keys and 4 LED, 2 power
outputs, 3 temperature sensors and 2 immersion sleeves made from chrome-plated brass; 2Plate heat exchanger made from stainless steel, cop-
per-soldered, flat-sealing connection T 1" (OT) – quickly disassembled for maintenance, specially embossed plate structure to avoid lime deposits;
3Circulation pump in primary return, especially energy-saving design, easy to service due to flat-sealing integration;
4Primary flow connection T 1" (OT, flat-sealing) made from brass, with shut-off valve; 5Primary return connection T 1" (OT, flat-sealing) made from
brass, with pump shut-off slider incl. backflow preventer; 6Cold water supply connection T 1" (OT, flat-sealing) made from brass; 7Hot water outlet
connection T 1" (OT, flat-sealing) made from brass; 8Circulation return connection option T ½" (IT) closed with plug; 9Single-jet meter – brass,
chrome-plated, connections ¾" (OT, flat-sealing), QN 2.5 m³/h; 10 Bottom section of housing made from powder-coated sheet steel with keyhole
drills for wall mounting; 11 Housing cover made from powder-coated sheet steel, removable; 12 EPP shell insulation (expanded polystyrene) for
plate heat exchanger; 13 Temperature sensor hot water; 14 Temperature sensor circulation return; 15 Temperature sensor storage cylinder; 16
Power switch to select pump output level; 17 Backflow preventer (in ball valve); 18 Temperature sensor primary; 19 Mains plug.
Wag ner & C o
1
7
6
13
9
14
3
5
12
4
11
10
18
8
16
15
19
2
17
Housing cover
Top section of housing

6EN-RATIOfresh-250-400_TI-MA-0809-11214900
2. Safety Information
The following safety information is intended to protect you
from hazards and dangers that may suddenly occur when
the device is handled incorrectly, either deliberately or un-
knowingly. We differentiate between general safety infor-
mation, explained on this page, and special safety informa-
tion, which is listed throughout the text of this manual. The
following symbols are important!
DANGER – possibility of personal injury
The following may occur during assembly or installation:
hazardous electrical shock, scalding, bruising/contusions,
and other adverse health effects.Please comply with the in-
structions marked with this symbol in the documentation.
CAUTION – possibility of property damage
This symbol indicates hazards that may result in damage to
components or a significant reduction of the functionality
of the system. Please follow the described assembly steps
and comply with the sequence of these steps.
NOTE – additional information
This symbol indicates useful notes, tips to make work
easier, and other information that may help you with the in-
stallation or operation.
2.1 Operator Qualifications
All tasks and activities involving the transport, installation,
as well as operation and servicing must be performed by
qualified technical personnel. We do not assume responsi-
bility or liability for damages resulting from noncompliance
with these instructions.
2.2 Intended Use
Function
Heated water from a storage tank is used with a plate heat
exchanger to prepare hot water with a constant tempera-
ture.The cooled down return water is layered into the lower
section of the storage tank.
This is controlled demand-dependent. Only when potable
water is withdrawn and detected by the single-jet meter,
the circulation pump feeds the exchanger with a variable
hot water volume stream from the storage tank so that a de-
fined tapping temperature is maintained.
The return temperature is the result of the storage tank tem-
perature, the pump speed, and the plate heat exchanger
design. The heat exchanger of the RATIOfresh freshwater
station is designed in such a way that the lowest possible re-
turn temperatures are reached, which exhibit only a minor
difference to the cold water temperature.
Thermal Disinfection
The Legionella Pneumophila Bacteria protection function
can be used to disinfect the entire hot water and circulation
piping network thermally and during freely selectable
times (day or week program). You choose between once
per week (Mon-Sun) or daily. This function serves to pre-
vent the formation of bacteria and viruses in the potable
water network.
The station uses an external relay output to activate the
buffer storage auxiliary or backup heating if the required
primary temperature (= disinfection temp. + hysteresis
dTNH) is not detected by the sensor Tbuffer. The display de-
picts “DISINFECTION.” If the required temperature exists
within the primary circuit (data logging with the tempera-
ture sensor “Tbuffer”), the thermal disinfection program
starts. The freely selectable disinfection temperature (e.g.
65 °C) is maintained across a settable time duration (e.g. 20
min) and across all flooded hot water and circulation pipes.
Unexpected malfunctions during the disinfection phase
are indicated to the user in plain text and additionally with a
visual signal (LED light, fig. 10, no. 4).
Potable water hygienists recommend a material tempera-
ture of 70 °C or higher for a duration of at least 3 minutes to
disinfect the piping network. The disinfection temperature,
however, should be a few degrees higher or the disinfec-
tion time somewhat longer to ensure proper disinfection
occurs. Do not forget to raise the branch lines to the hot wa-
ter tapping points to the required temperatures by with-
drawing water several times for several minutes.
Before activating the disinfection function, check whether
the hot water or circulation network can sustain such high
temperature stress (e.g. damaging galvanized steel pipes)
and whether the carbon hardness of the potable water is
within an acceptable range.
The hot water users are at risk of scalding injuries while the
disinfection program is running. The disinfection should
therefore be carried out at night.
Circulation
The temperature difference is calculated from the circula-
tion flow and return temperature and compared with the
preset nominal difference. If the temperature difference is
too small, the control detects an oversupply of the circula-
tion and reduces the output of the circulation pump based
on the deviation. If the temperature difference is too great,
the control increases the output of the circulation pump
based on the deviation. The mass flow is then varied
through a pulsed modulation of the pump output. If an ad-
justable return temperature is exceeded, the controller
switches the pump off.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 7
Standby Temperature Control
The RATIOfresh freshwater station is also equipped with a
standby temperature control in addition to the circulation
function. The control activates the primary pump and sup-
plies the station with hot water to maintain the preset
standby temperature at the primary flow outlet port re-
gardless of a withdrawal of hot water.
This function serves to preheat the plate heat exchanger;
this means that hot water is thus much more quickly avail-
able at the desired nominal temperature in case water is
withdrawn. This function also protects from frost if the
standby temperature is set to a lower value of 10 °C. The
standby temperature control is only activated if the cylin-
der temperature is sufficiently high.
2.3 Standards and Guidelines
The following standards and guidelines must be observed
and complied with when installing hydraulics and/or per-
forming electrical wiring: IEC 364 or CENELEC HD 384,
DIN VDE 0100 and IEC-Report 664, DIN VDE 0110 and na-
tional accident prevention rules and regulations, as well as
VDE 0100, VDE 0160 (EN 50178), VDE 0113 (EN 60204),
and local rules and specifications of your energy provider
or utility company.
Specifications outlined by DVGW W551 concerning pro-
tection from the Legionella pneumophila bacteria must be
observed for multi-family home installations. A circulation
must be operated between hot water heater and tapping
point for potable water volumes greater than 3 liters. The
hot water outlet temperature of the RATIOfresh station
must always be set to ≥60 °C.
2.4 Installation Recommendations
The tank must be installed in a frost-free room with short
lines to the consumer.
De-energize the control unit as outlined by the manual be-
fore working on the pump or the control unit. Controller
and pump carry electricity even if the controller switches
the pump off!
Cold and Hot Water Line
A safety valve (cf. fig. 5) is required in the cold water supply
line as specified by DIN 4753 T1. A min. thread diameter of
DN 15 must be selected for a heating output of max. 75 kW.
The safety valve can be omitted only if a type approved flow
monitor limits the water temperature to 95 °C. The valve
must be designed for a blowing-off pressure that corre-
sponds with the permissible working overpressure. In case
of 10 bar and higher waterline pressures, install a pressure
reducer behind the water meter. When heating the fresh-
water station without water tap,water is dripping out off the
safety valve. Use a siphon funnel to catch and dispose off
this water.
Do not install a shut-off between safety valve and freshwa-
ter station. A drain valve should be installed for mainte-
nance and service tasks. The functionality of the safety
valve must be checked regularly in accordance with DIN
4753. The exhaust vent may never be closed or restricted. A
corresponding water filter meeting current technology
standards is to be installed into the cold water supply line.
Connecting the Circulation
The freshwater station RATIOfresh is designed to be con-
nected to a circulation line.The circulation pump must be a
commercially available stepped wet pump. E-pumps or
pumps with integrated motor protection or ON/OFF
switching electronics may not be operated.
Connecting the Primary Circuit
The piping of the primary circuit should be as short as pos-
sible to achieve the rapid heating of the heat exchanger
when water is tapped. The max. permissible pressure loss
within the primary circuit may not be exceeded when lines
are longer.
A bleeder is to be installed at the highest point of the pri-
mary circuit. The primary flow should be withdrawn at the
hottest point of the buffer storage tank, and the primary re-
turn should be returned as close to the bottom of the buffer
storage tank as possible.
Gravity circulations may occur depending on the length,
design, and insulation state of the primary circuit. This con-
tinuously withdraws energy from the standby section of the
buffer cylinder.
A gravity brake with low admission pressure must be in-
stalled on-site in addition.
Thermal Disinfection / Protection from Legionella
Pneumophila Bacteria
Please note that the “Disinfection” function only can be
used as intended if the cylinder temperature sensor can
correctly measure the derivative temperature within the
connected auxiliary heating range. The sensor should thus
be attached 10 cm below the actual tapping point on the
buffer cylinder (on the tank wall as depicted in fig. 7).
Please also note that increased temperatures within the hot
water network and associated pipes pose a risk of scalding
injuries while the disinfection program is running!
Protection from Corrosion and Lime Buildup
All water-conducting parts are basically subject to corro-
sion and lime buildup, especially if temperatures exceed
60 °C and with aggressive water. Hot water temperatures
thus should never exceed 60 °C. Significant lime deposits
are not expected with carbonate hardness below approx.
10° dH and temperatures less than 60 °C. If your potable
water is harder than this, we recommend on-site lime
buildup reducing measures. If the plate heat exchanger
must be decalcified on a regular basis, irrigation cocks (fig.
6) should be installed during the system assembly.
The plate heat exchanger of your freshwater station is
made from copper soldered stainless steel plates. Steel
pipes may thus not be used in the flow direction (towards
the freshwater station) since copper is water soluble in
minute particles and causes pitting when deposited on
steel.
Water with low hydrocarbon content and high portion of
neutral salts (e.g. soft water containing chloride) can cause
dezincification of the installed brass elements.

8EN-RATIOfresh-250-400_TI-MA-0809-11214900
3. Installation
3.1 Prior to the Installation
●Before assembly, please compare the delivered compo-
nents with the parts list in table 3.
●You need the following tools: drill, stone drill (12 mm),
voltage meter, screwdriver, folding meter-rule, wrench
size 10, monkey wrench, ratchet with size 13 socket.
●Materials/components needed on-site: sets of union
connectors to connect primary and potable water cir-
cuit, a safety subassembly to install into potable water
network if needed, a circulation pump if needed, pipe
material, and insulation material.
●Open the RATIOfresh freshwater station as depicted in
fig. 8 by removing the housing cover in the lower section
from the lower part and lift out off the snap-in groove.
3.2 Wall Mounting (fig. 4)
●Transfer the hole pattern to the wall as depicted in fig.4.
●Drill holes (1) with a 12-mm stone drill and insert in-
cluded plugs (2).
●Insert screws (3) to a distance of 1 cm and insert housing
(4) into keyholes (5) and attach screws.
●Tighten screws (3) firmly.
3.3 Storage Tank Mounting (fig. 5)
The RATIOfresh freshwater station is suitable for mounting
directly on all buffer cylinders (RATIO-H series) using the
additionally available tank expansion kit (cf. accessories,
table 4):
●Remove the insulation of the RATIO-H (1) cylinder and
snap the mounting plate (3) with the U-shaped ends (4)
into the second (2) and fifth connection (5) from the top.
●Screw down the mounting plate with the included 1 1/2"
flat swivel nuts (6).
●Then screw the included 3 hexagonal carriage bolts (7)
halfway into the mounting plate, attach lower part of
housing with keyhole drill holes (fig. 4) and tighten with
the carriage bolts (7).
1
2
5
4
6
37
4
6
Figure 4 Wall mounting
1Holes; 2Plugs; 3Screws; 4Bottom section of housing;
5Keyholes.
Figure 5 Tank mounting
1RATIO-H cylinder; 2Second connection from top;
3Mounting plate; 4Bracket; 5Fifth connection from top;
61¼" flat swivel nut; 7Hexagonal carriage bolts.
254
827
1
2
4
3
5
5
5
3
4

EN-RATIOfresh-250-400_TI-MA-0809-11214900 9
3.4 Connecting Potable Water (fig. 6)
Cold and hot water connections must be connected to the
freshwater station in accordance with the rules and regula-
tions issued by the local water utility or water provider. We
recommend connecting to the potable water network in
the manner illustrated in fig. 6.
●A safety subassembly (3) with safety, shut-off, and check
valve must be installed in the cold water supply (2) in
acc. with DIN 1988. Make sure there is no shut-off be-
tween the RATIOfresh station (1) and the safety sub-
assembly (3). To connect the piping to the cold water
supply (7) of the station, please use the connection sets
with 1" swivel nuts (4), soldered connection 22 mm (5),
and flat seal (6) or threaded connection sets as an alter-
native, both available as additional accessories.
●The hot water outlet of the station (8) must be connected
to the hot water network with soldered or threaded con-
nection sets and well insulated as well. Do not forget flat
seals (6)!
●Potable water with a high content of lime may require
that the heat exchanger is flushed regularly. This re-
quires installing irrigation cocks (9) and (10) into the
cold and hot water lines in close proximity to the station!
After irrigation cock (10) in the hot water line, an addi-
tional shut-off cock (11) is needed for flushing the pipes.
3.5 Connecting Circulation
(Optional, fig. 6)
DVGW 551 specifies a circulation element or system in
larger hot water networks. The circulation return (21) must
be installed directly before tapping point (22). The circula-
tion pump (23) is supplied with voltage and controlled by
the controller. Chapter 3.7 provides information about the
correct connection of the power cable (24). Please note
that a backflow preventer (integrated in the figure of the cir-
culation pump) must be installed in the circulation line.
●Remove the 1/2" plug (26) at the circulation return con-
nection of the station (25) and attach the circulation re-
turn line as per connection diagram.Use a 1/2" threaded
connection (27).
Wagn er & Co
1
8
7
25
6
5
4
10
11
24
21
6
5
4
9
3
1/2 AG
22
26
27
23
KW
2
Figure 6 Potable water connection
1Bottom section of housing; 2Cold water supply; 3Safety subassembly; 41" swivel nut; 522-mm soldered connection; 6Flat seal;
7Cold water supply; 8Hot water outlet; 9Irrigation cock; 10 Irrigation cock; 11 Shutoff valve; 21 Circulation return;
22 Tapping point; 23 Circulation pump; 24 Connection cable to circulation pump; 25 Circulation return connection;
26 ½" plug; 27 ½" threaded sleeve.

10 EN-RATIOfresh-250-400_TI-MA-0809-11214900
3.6 Installing the Primary Circuit (fig. 7)
In order for the RATIOfresh freshwater station to yield the
desired output,it must be supplied with a sufficient volume
of hot water either from a buffer storage tank or a district
heating system. Table 14 lists the required primary flow
temperatures.
The primary circuit may never be serviced by another
pump even only temporarily!
●Route primary flow line (1) from the hot storage tank sec-
tion to the RATIOfresh-freshwater station and connect
with soldered or threaded connection sets. At the RATIO
cylinder use 18-1½" connection sets with swivel nut (4),
soldered or threaded connection (3) and flat seal (2),
and connection sets 22-1¼" with swivel nut (7), soldered
or threaded connection (6) and flat seal (5) at the station.
Install a bleeder if lines in the primary flow are installed in
an upward direction!
●Connect the primary return line (8) and route to the cor-
responding storage tank connection that matches the
temperature level. Table 14 lists the return temperatures
of the station in dependency of the operating condi-
tions.
●Routecableofthetemperaturesensor(9) marked
“Tprim” from the freshwater station along the primary flow
and attach sensor in the aux. heating section of the
buffer cylinder approx. 10 cm below the actual tapping
point of the primary flow. Use the uppermost position of
the connector block (10) at the RATIO buffer cylinder.
The sensor must correctly detect the cylinder temperature.
Check the correct position of the sensors after the initial
startup!
Wagner&Co
10 cm
7
6
5
9
432
5
6
7
8
910
4
1
32
10
Figure 7 Primary circuit installation
6-1 Primary flow line; 6-2 Flat seal; 6-3 Soldered or threaded connection; 6-4 Swivel nut; 6-5 Flat seal; 6-6 Soldered or threaded union; 6-7 Swivel
nut; 6-8 Primary return line; 6-9 Temperature sensor Tbuffer ;6-10 Connector block.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 11
3.7 Switching the Primary Return Flow
(fig. 15)
When the RATIOfresh freshwater unit is used in systems
that are continuously operated at water temperatures >=
60 °C and work with circulation nets, we recommend the
controlled switching of the return flow to the buffer cylin-
der. Thus it can be avoided that during periods of low hot
water drawing, hot water enters the lower part of the the
buffer cylinder where it could cause unwanted mixing.
The switching can be carried out by a 3-way valve (see solu-
tion shown in fig. 15).The valve should have short switching
times (<30 s) and low pressure loss. (e.g. Wagner & Co 3-
way-valve, order no. 160 101 44). Control should be based
upon temperature difference, e.g. via solar controller
SUNGO SXL.
3.8 Connecting the Controller (fig. 9)
All tasks and activities involving the transport, installation,
as well as operation and servicing must be performed by
qualified technical personnel.
The controller is for the most part prewired. A fourth tem-
perature sensor and a circulation pump can be connected
in addition to the mains connection.If the disinfection func-
tion is utilized, the auxiliary heating of the buffer cylinder
must be activated via the external switching output.
●To open the controller turn the 4 Phillips screws (cf.10-9)
to the left by 90° and remove cover of housing. Remove
the flat ribbon cable plug to the display board from
socket (3) and set aside the cover of the controller to
avoid damaging it.
●Remove the plug (4) to the mains connection from
socket (5), route the mains cable (cable cross-section 3 x
0.75 to 1.5), e.g. along the primary return and a free PG
gland (cf. 10 no. 10), into the station. Attach phase, zero
conductor, and potential ground to plug (4) and then in-
sert this plug into socket (5).
●If needed, connect the circulation pump with plug (6) in
the same way and plug into socket (7) (required cable
cross-section: 3 x 0.75 to 1.5).
●A fourth temperature sensor (type KTY, cf. accessories)
can be connected via plug (8) and socket (9).
●A RS 232 interface cable available as an accessory can
be connected to plug (12) (socket (13)). It is also possi-
ble to log all measured values, the current controller sta-
tus, and the current pump output. This requires connect-
ing the 9-pin D-SUB plug of the data cable to the serial
RS 232 interface of a computer. Possible logging utilities
are a terminal program such as included with Windows
95, 2000, or XP (All Programs -> Accessories). Use these
transfer settings: RS 232 Port = COM1/COM2, Emula-
tion = ANSI, Transfer rate = 19200 bit/s, Data bits = 8,
Stop bits = 1, Parity = None, Protocol = No protocol
(XON/XOFF, RTS/CTS).
●The additional external switching output of the
RATIOfresh freshwater station on plug (14) socket (15) is
intended for the activation of the aux. boiler heating for
the disinfection operation. Please note that the current
applied to this potential-free switching contact may not
exceed a current intensity of max. 0.5 A. If a boiler de-
mand is triggered, the controller closes contact 11-12
and opens contact 11-13. Once the boiler is no longer
needed, contact 11-12 is opened again and contact 11-
13 is closed again. If contact 11-12 is closed, the third
LED from the left (cf. 10-3) is continuously green.
●fig. 9 also depicts the control fuse (16) (400mAT / 250 V)
and the output fuse (17) (6.3 AT / 250 V).
●Hold controller housing cover before the bottom sec-
tion of the housing, reattach the flat ribbon cable to the
display board (3),attach the cover to the bottom section,
press down the 4 Phillips screws (cf. 10-9) and turn to-
wards the right by 90°.
3.9 Closing the Housing (fig. 8)
To close the metal housing, insert the housing cover (1) into
the snap-in groove (2) at the bottom section of the housing
(3) and then snap the two snap-in plugs (4) at the bottom
into sockets (5).
2
1
4
3
4
5
5
Figure 8 Close housing
1Housing cover; 2Snap-in groove; 3Bottom section of housing;
4Snap-in plug; 5Snap-in socket.

12 EN-RATIOfresh-250-400_TI-MA-0809-11214900
Figure 9 Controller connection
3Socket flat data cable; 4/5 Mains (plug/socket); 6/7 Circulation pump (plug/socket); 8/9 Primary circuit sensor (plug/socket); 10/11 Meter (plug/
socket); 12/13 Data cable (plug/socket); 14/15 External switching output for heating circuit control (plug/socket); 16 Micro-fuse, 250V/T6,3 A;
17 Micro-fuse, 250V/T400 mA; 18/19 Secondary sensor hot/cold water (plug/socket); 20/21 Primary pump (plug/socket).
12 1311
1
2
3
4
PE
LN
P1 PE
LN
P2
PE
LN
Low voltage area 230 V
+5V
+15V
+
RT +10 9
11
3
13
9
19
15
5
21
7
16
17
14
18
8
10
12
6
20
4
at rest
11 12 13
activated
11 12 13
Hot-/cold water sensors
Hot water sensor (blue)
Mass (brown)
Circulation / cold water
sensor (blue)
Primary circuit sensors
Buffer cyl. sensor (blue)
Mass (brown)
Primary flow sensor (blue)
Optional data cable
Plus 5V (yellow)
TxData (white)
RxData (green)
Mass (brown)
Optional circulation pump
Grounding (yellow/green)
Zero (blue)
Phase (black or brown)
Primary pump cable
Grounding (yellow/green)
Zero (blue)
Phase (black or brown)
Mains connection
Grounding (yellow/green)
Zero (blue)
Phase (black or brown)
Single jet meter
Mass (brown
Impulse (green)
not used
not used
22

EN-RATIOfresh-250-400_TI-MA-0809-11214900 13
4. Controller Operation
4.1 Controller Displays (fig. 10)
The controller of the RATIOfresh freshwater station features
a permanently backlit LCD display (5) with 2 lines, LCD- Dis-
play (5), 4 LEDs depicting information about the operating
status of the station (1) to (4) and 3 control buttons (6),(7),
and (8).Open the cover of the controller by unscrewing the
four Phillips screws (9)!
IMPORTANT
Only open the controller housing cover when unit is de-
energized! Only qualified technical personnel!
●A steady green LED (1) is based on the output of the pri-
mary circuit pump (max. output), with longer green
phases (medium output), or with shorter green phases
(low output).
●LED (2) indicates the operating status of the circulation
pump (if connected) in the same manner.
●A steady green LED (3) indicates that the external
switching output to activate the auxiliary heating (only
disinfection function) is closed.
●A steady red LED (4) indicates that the disinfection tem-
perature was less than required during the disinfection
time or that the primary circuit temperature fell below
the required temperature level.
●Use keys < (6) and > (8) to browse within the info level
and depict all current temperatures and pump outputs.
4.2 Controller Settings (fig. 10)
●Use key ■(7) to switch from the info level to the menu
level.
●Use keys < and > to select the desired setting menu.
●Press key ■to switch to the value level where the set
nominal values are listed in square brackets.
●Select the desired menu item with the < and > keys and
release for change with the ■key: the square keys are no
longer depicted.
●Use the < and > keys to set the new nominal value and
press the ■key to save.
●Exit the menu level with the menu item “END … “ and se-
lect with the < and > keys and press the ■key. This re-
turns you to the next higher level.
Temp. Warmwasser
Ist: 47°C
Temp. hot water
Actual: 46°C
Temp. Warmwasser
Ist: 47°C
Settings:
HOT WATER
Info Level
Menu level
Pump 1 mode
[AUTO]
Temp. hot water
Nominal: [45]°C
Value level
Temp. Warmwasser
Ist: 47°C
Temp. hot water
Nominal: [45]°C
Setting level
Temp. hot water
Nominal: [50]°C
Settings:
End ...
End ...
previous post
Temp. Warmwasser
Ist: 47°C
Temp. hot water
Nominal: [50]°C
1
2
3
4
5
6
7
8
10
Wagner & Co
9
Figure 10 Controller display and controller configuration
1LED, primary circuit pump; 2LED, circulation pump; 3LED, Aux. heat-
ing activation; 4LED, temperature; 5LCD display; 6Left key; 7Center
key; 8Right key; 9Phillips screws.

14 EN-RATIOfresh-250-400_TI-MA-0809-11214900
4.3 Controller Setting Tables
Table 5 Info Level
(use the < and > keys to select the desired display, use the key to switch to the menu level)
Menu Description Range
TEMP. HOT WATER
Actual: ## °C
Temperature at hot water connection of station. While water is being
withdrawn, the hot water temperature is displayed, otherwise the standby
temperature.
-20 to 120 °C
TEMP. CIRCULATION
Actual: ## °C
Circulation return temperature (with active circulation function or cold water
temperature [without circulation system]) -20 to 120 °C
TEMP. VESSEL
Actual: ## °C
Derivative temperature in aux. heating section of the buffer cylinder. The
RATIOfresh controller corrects the hot water control function based on this
measured value.
-20 to 120 °C
PRIMARY FLOW
Actual: ## °C
Temperature at primary flow connection of the unit. While water is drawn, the
flow temperature is displayed, otherwise the stand-by temperature is shown. -20 to 120 °C
P 1 – HOT WATER
Output: ### % Output of primary circulation pump in % 0 to 100 %
P 2 – CIRCULATION
Output: ### % Output of circulation pump in % 0 to 100 %
TAPPING/AREA
###%/##
Tapped volume in % of the set max. tapping volume. The range number
indicates the tapping slot reached when withdrawing water [01 – 10], see also
-> max.tap volume.
0to100%
MONDAY
##:##:## Day of the week and current time, in hours:minutes:seconds Monday – Sunday,
00:00 to 24:00
Table 6 Menu Level
(use the < and > keys to select the desired menu and confirm with the key)
Menu Description
SETTINGS:
HOT WATER
Settings for the primary circuit pump, nominal hot water
temperature, and standby temperature, details in Table 7
SETTINGS:
CIRCULATION
Settings for the circuit pump operating mode, determining the time
frame for the circulation operating, circulation return temperatures,
details in Table 8
SETTINGS:
DISINFECTION
Settings for the thermal disinfection, time, duration, temperatures,
details in Table 9
SETTINGS:
TIME Setting of day of the week and time, details in Table 10
SETTINGS:
MAINTENANCE
This menu serves to change control parameters with special
applications and requires input of a code to prevent accidentally
changing these parameters (code available upon request), details
in Table 11
SETTINGS:
MANUAL FUNCTION
This menu is used for maintenance tasks directly affecting the
operating mode of the primary circuit pump and the circulation
pump, details in Table 12
SETTINGS:
LANGUAGE Presetting the desired language for all displays, details in Table 13
SETTINGS:
DEFAULTS
Activate this menu with the ■key and select “YES” with the < or >
keys to restore all values of all menu items to the factory settings
indicated in Tables 7 to 13 (factory settings). Important! All
customized settings are deleted and replaced with the default
settings! Select “END” to return to the menu level.
END Select this menu item with the < and > keys and press the ■key to
return to the info level.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 15
Table 7 Value Level – HOT WATER SETTINGS
(use the < and > keys to select the desired menu item, use the key to switch to the setting level, use < and > to change values, save
with the key)
Designation Description Range Base value Your value
PUMP 1 – MODE
[AUTO]
Software can be used to set the operating mode of the primary circuit
pump and is used for manual operation of the pump.
OFF
ON
AUTO
AUTO
P 1 MIN CAPACITY
[010] %
The min. output indicates the pump capacity used to control the hot
water in standby and circulation. This value cannot be less than 10 %
because the pump bearings no longer have a sufficient amount of water
available for use with a value below 10 %.
10–70% 10%
TEMP. HOT WATER
Nominal: [45] °C Setting the desired nominal hot water temperature 25-70 °C 50 °C
TEMP.
CIRCULATION
Nominal: [45] °C
Setting the desired circulation flow temperature concerning the
temperature measured as the hot water temperature sensor 25-70 °C 45 °C
TEMP. STANDBY
Nominal: [40] °C
This is the temperature maintained by the system if no water is
withdrawn and the circulation function is not active.
The lowest set value of 10 °C ensures protection from frost for the
RATIOfresh freshwater station.
The current buffer cylinder temperature must be higher than the
nominal standby temperature by at least5Korthehold function is
deactivated.
10-70 °C 40 °C
MAX. USAGE
Nominal: [20] l/min
Setting the tap volume max. occurring in this system on a regular basis.
For example, if you use a shower with 10 l/min and two water faucets
each with 5 l/min, the max. tapping volume to be expected on a regular
basis amounts to approx. 20 l/min. Set [20] l/min as the max. tap
volume. The selected tapping volume range (here: 0 l/min to 20 l/min)
is divided by the control into 10 time slots and an internal control value
is adjusted for each time window during the adaptation process.
Selecting an unfavorable max. tap volume value can thus adversely
affect the control performance. The actual max. output of the station is
not reduced by this setting.
20 to
80 l/min 20 l/min
END Use the < and > keys to select and then confirm returning to the menu level with the ■key.
Table 8 Value Level – SETTINGS: CIRCULATION
Designation Description Range Base value Your value
MODE
[time]
Setting the mode for the hot water circulation. The “continuous” mode
controls the circulation continuously and adjusts circulation to the
specified temperature difference between hot water outlet and
circulation return.
The “time” mode starts the control of the circulation pump as soon as
the withdrawal of water is detected (brief opening of a tapping point
suffices). The control ends if the “post-event time” (see below) has
expired after the hot water has been withdrawn.
Programming the time slots makes it possible to combine both control
modes: When selecting “time” and programming the time slots, the
circulation control functions outside of the time window according to
the detection of the withdrawal of water and within the time window
according to the temperature difference.
continuous
time continuous
PUMP 2 – MODE
[AUTO]
Software can be used to set the operating mode of the circulation
pump and is used for the manual operation of the pump.
OFF
ON
AUTO
AUTO
P2 – MIN
CAPACITY
[010] %
This setting indicates the min. pump capacity used to control the
circulation. The value must be adjusted depending on used pump type
and check valve.
10–70% 10%
FOLLOW-UP TIME
[010] min
The follow-up time is only adjustable if the “time” circulation mode is
selected. Set the time in minutes for which the circulation time is to run
after the end of a tapping.
0 – 255 min 10

16 EN-RATIOfresh-250-400_TI-MA-0809-11214900
Table 8 Value Level – SETTINGS: CIRCULATION
Designation Description Range Base value Your value
The time slots 1 to 4 are depicted in the menu only if the circulation mode “time” has been selected.
TIMESLOT
WEEKDAY
slots 1-4
Sub-menu for setting the circulation times on weekdays (Monday
to Friday)
TIMESLOT
WEEKEND
slots 1-4
Sub-menu for setting the circulation stimes on weekends (Saturday
and Sunday)
TIMESLOT 1 (2,3,4)
Start:
[00:00] Time
First switching on point for the circulation pump in “time” mode. Press
the ■key to release the time for changes. Use < and > to set the hours
first and then use ■to switch to the minute input and change the
minutes with < and > and then use ■to return to the time window level.
00:00-
24:00 00:00
TIMESLOT 1 (2,3,4)
Stop:
[00:00] Time
First switching off point for the circulation pump in “time” mode. Follow
the procedure already described.
00:00-
24:00 00:00
TARGET GAP
Nominal: [10] K
The nominal difference indicates the temperature difference in K, which
is to be maintained between hot water outlet and circulation return. 5–25K 10K
MAX.
TEMPERATURE
Nominal: [40] °C
This adjustable value indicates the circulation return temperature in °C.
If this value is exceeded, the circulation pump switches off. 5–70°C 40°C
END Select this menu item with the < and > keys and press the ■key to return to the menu level.
Table 9 Value Level – DISINFECTION SETTINGS
Designation Description Range Base value Your value
The disinfection can be displayed and activated only when the cylinder temperature sensor is connected. Based on the current measured
value, the demand for aux. heating is carried out via the external potential-free output.
Risk of scalding during the disinfection cycle!
MODE
Nominal: [OFF]
Select operating mode for the disinfection of the hot water system.
When in automatic mode (AUTO), the hot water and circulation network
are thermally disinfected at the selected time. Select a time outside of
the typical tapping times to reduce the risk of scalding!
With the operating mode ON, the disinfection is activated continuously
(e.g. for testing the function), with OFF is it completely deactivated.
AUTO
ON
OFF
OFF
STARTING TIME
[23:00] Enter the time when disinfection is to start. 00:00 –
24:00 23:00
STARTING DAY
[Monday]
Setting the week program. Disinfection can also be started on a
predefined day (Mon-Sun) or every day.
Mon to Sun,
daily Sun
SYSTEM TEMP
Nominal: [65] °C
The system regulates the circulation pump so that the set system
temperature is reached in the circulation return. The hot water temp. is
then adjusted to a temperature that is 50 % higher than the hysteresis of
the aux. heating.
55–80°C 65°C
DURATION
[020] min
Disinfection duration in minutes. This is the duration for which the
system temperature is maintained in the circulation return. The LED
diode (9-4) lights up red if the system duration falls below this value
during this time.
0 – 60 min 20 min
TEMP. RISE
[10] K
Aux. heating hysteresis. The external (potential-free) switching output of
the controller is closed as soon as the temperature in the aux. heating
section of the buffer drops below the sum of disinfection temp. and
hysteresis.
The boiler serving for the aux. heating must be connected in a way that
it starts the boiler charge function when the potential-free contact is
closed. Since the max. temperature of the boiler is not monitored, the
boiler temperature limitation must be set in a way as to prevent excess
temperatures in the system.
5–15K 10K
END Select this menu item with the < and > keys and press the ■key to return to the menu level.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 17
Table 10 Value Level – SETTINGS: TIME
Designation Description Range Base value Your value
WEEKDAY
[Monday]
Make sure the day of the week and the time are set correctly especially
when using the circulation and disinfection function.
Monday to
Sunday -
TIME
[00:00]
Make sure the day of the week and the time are set correctly especially
when using the circulation and disinfection function.
00:00 –
24:00 -
END Select this menu item with the < and > keys and press the ■key to return to the menu level.
Table 11 Value Level – SETTINGS: SERVICE
Designation Description Range Base value Your value
CODE NUMBER
800174
MON-005
This menu serves to change control parameters with special
applications and requires input of a code to prevent accidentally
changing these parameters. The code is available upon request. Use
the < and > keys to set the correct code.
0 – 255
RS232-INTERVAL
[003] s Setting the output interval of the serial interface. 1 – 255 s 3 s
PRIMARY FACTOR
[20]
Compensation factor to affect the sensitivity of the hot water control in
dependency of the buffer cylinder temperature. If the compensation
factor is set to 0, compensation is not active and that also applies to
when neither primary flow sensor nor buffer cylinder sensor are
connected.
0 – 240 20
Kp CIRCULATION
[05] K
Boost factor of pump in relation to the determined temperature
difference hot water-circulation return 1–10K 5K
IMPULSE/LITRE
[35 ] Impulse value of the volume flow sensor 0 – 100 35
Kp VOL
[05] K Boost factor of pump in relation to drawn water volume. 1 - 50 K 5 K
RATIOfresh type
[250-400] Controlling variation - this selection resets all values to factory setting. 250/400/
800 250/400
ADAPTATION
VALUES
Start values for calculation of pump power. For all 10 tapping slots start
values are set. They are the base of calculating the required pump
force. The actual temperatures and tapping volumes are incorporated
in the calculation. The individual values can be examined and changed
by selecting the respective sub-menus. If not all slots are reached
during controlled tapping while commissioning the system (chap. 5.6),
the adaptation values can be set directly. The power of the pump
continuously increases over the ten tapping slots. Each slot must have a
higher value than the previous one.
ADAPT. VALUE 1
60 °C 01 [08]
Adaption value of the first tapping slot. On the left the current hot water
temperature is shown. In the centre you can see the tapping slot
currently in use. On the right, the momentary adaptation value can be
seen. In order to make an adjustment, the adaptation value (display:
top) related to the current tapping slot (display: centre) should be
selected. Increasing this value will also increase the initial pump power
of the slot. Setting the value to high results in risk of scalding, since the
controller only starts with the adaptation after 10 s and then reduces the
pump power until the set water temperature is reached.
5–90 8
ADAPT. VALUE 2
60 °C 02 [15] Adaptation value of the second tapping slot 5 – 90 15
ADAPT. VALUE 10
60 °C 10 [71] Adaptation value of the tenth tapping slot 5 – 90 71
PUMP INTERVAL
[200] ms
200 – 600
ms 200 ms
END Select this menu item with the < and > keys and press the ■key to return to the menu level.

18 EN-RATIOfresh-250-400_TI-MA-0809-11214900
Table 12 Value Level – SETTINGS: MANUAL OPERATION
Designation Description Range Base value Your value
P1 – HOT WATER
[AUTO]
Software can be used to set the operating mode of the primary circuit
pump and is used for the manual operation of the pump.
OFF
ON
AUTO
AUTO
P2 – CIRCULATION
[AUTO]
Software can be used to set the operating mode of the circulation
pump and is used for the manual operation of the pump.
OFF
ON
AUTO
AUTO
BOILER REQUEST
[AUTO]
Software can be used to set the operating mode of the potential-free
relay and is used for manual operation.
OFF
ON
AUTO
AUTO
END Select this menu item with the < and > keys and press the ■key to return to the menu level.
Table 13 Value Level – SETTINGS: LANGUAGE
Designation Description Range Base value Your value
LANGUAGE
[English] All menu items and displays are depicted in the selected language.
German,
French,
English,
Italian,
Spanish
German
END Select this menu item with the < and > keys and press the ■key to return to the menu level.

EN-RATIOfresh-250-400_TI-MA-0809-11214900 19
5. Initial Startup
5.1 Checking Installation
Check especially the following three points:
●The correct connection of the pipes based on the con-
nection diagrams in fig. 6 and fig. 7 as well as the de-
scribed assembly steps.
●The correct placement of the temperature sensor Tbuffer
within the aux. heating section of the buffer cylinder. The
controller uses this sensor to detect the available tem-
perature for the functions “circulation” and “standby”.
Temperature sensor Tbuffer also serves to activate the aux.
heating boiler during the thermal disinfection process.
●If the disinfection function is to be activated, the external
switching output of the RATIOfresh freshwater station
must be connected with the external switching input of
the aux. heating boiler.In this case, the boiler is fired and
the storage charge pump starts when the RATIOfresh
issues a boiler request.
5.2 Filling the Primary Circuit (fig. 11)
Now slowly fill the buffer cylinder and the primary circuit.
This requires inserting the mains plug and switching the
primary circuit pump to the operation mode “Constant” us-
ing the “Manual Mode” menu. Open check valve (15) at the
ball cock in the primary return (see fig. 11 enlarged section
for the correct position). Vent the primary circuit during the
filling process.
5.3 Configuring the Controller (fig. 10)
Now configure the controller for the specific on-site condi-
tions. fig. 10 provides an overview over the menu structure
and explains the use of the control keys. Enter the corre-
sponding values into the setting menus in the following
order: “HOT WATER”, “CIRCULATION”, “DISINFECTION”,
“SERVICE”, “LANGUAGE”, and “TIME”. Tables 7 to 13 pro-
vide assistance with selecting the respective values. To
finish, enter the individual configuration into the “Your
Value” column.
5.4 Selecting Pump Level (fig. 11)
The RATIOfresh freshwater station pump has three power
levels (maximum, medium, and minimum). The setting key
(16) is located on the upper side of the pump switching box.
Select the matching level for the chosen max. tapping vol-
ume based on Table 14. The table values were calculated
based on the assumption that the potable water flows in
with a cold water temperature of 10 °C and is heated by the
RATIOfresh station to a nominal temperature of 45 °C or
60 °C (incl. pressure loss of 0.7 m corrugated tube DN 16
between station and buffer and screw connections):
●Select the volume flow from column 1, which is the max.
volume you wish to withdraw from the hot water net-
work.
●The pressure loss listed in column 2 occurs additionally
in your hot water network with the indicated tapping rate
due to the station.
2
5
6
34
12
90°
10
11
8
16
7
9
14
15
15
Z
A
Z
A
Ready
for operation
Open
Figure 11 Heat exchanger disassembly
21" swivel nut; 3Heat exchanger; 41" swivel nut; 5Shut-off valve;
61" swivel nut; 7Ball valve; 8Circulation pump; 91¼" swivel nut;
10 1" swivel nut; 11 1" swivel nut; 12 Size 36 wrench; 14 Size 10
wrench; 15 Check valve; 16 Adjustment pump speed.

20 EN-RATIOfresh-250-400_TI-MA-0809-11214900
●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”.
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.