OSF WATERFRIEND exclusiv MRD-2 User manual

Installation and Operating Instructions
Water treatment for pH and ORP
optional with web server and Internet connection
Technical Data
WATERFRIENDexclusiv
Nominal voltage
1/N/PE 230V/50Hz
Metering pump pH
Peristaltic pump
Metering pump ORP
Peristaltic pump
Flow rate pH
0 to 10 L / h
Flow rate ORP
0 to 10 L / h
Protection class
IP 20
Housing size
500 x 390 x 130
Humidity
0 to 95%, non condensing
Surrounding temperature
0 to 40 °C
Measuring water pressure
max. 2 bar
MRD-2
Made by

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 2 (44)
Subject
Contents
Page
General.......................................................................................................................................................................5
Safety information ....................................................................................................................................................5
Installation and operating manual .......................................................................................................................5
Caution ................................................................................................................................................................5
Canister ...............................................................................................................................................................5
Personnel qualification ........................................................................................................................................5
Installation.................................................................................................................................................................5
Installation ...........................................................................................................................................................6
Installation in the water circuit .............................................................................................................................6
General informational installation in the water circuit..........................................................................................6
Electrical power supply............................................................................................................................................7
Low-voltage cables..............................................................................................................................................7
Wiring diagram ....................................................................................................................................................7
Alarm ...................................................................................................................................................................7
External pumps....................................................................................................................................................7
Enabling...............................................................................................................................................................8
RS-485 ................................................................................................................................................................8
Connecting to EUROMATIK.net ..............................................................................................................................8
External Touch-Panel..........................................................................................................................................8
Connecting to the computer network (optional) ...................................................................................................8
Operation...................................................................................................................................................................9
Displays...............................................................................................................................................................9
Temperature........................................................................................................................................................9
Measurement water flow quantity........................................................................................................................9
Child lock...........................................................................................................................................................10
Professional level ..............................................................................................................................................11
Bleed metering hose..........................................................................................................................................11
pH regulation...........................................................................................................................................................11
Switching off pH regulation................................................................................................................................11
Setting the pH target value................................................................................................................................12
Setting the alarm limit values ............................................................................................................................12
Setting the lower pH alarm................................................................................................................................12
Setting the upper pH alarm ...............................................................................................................................13
Setting the pH proportional range .....................................................................................................................13
Meaning of the proportional range ....................................................................................................................14
Setting the maximum pH metering time............................................................................................................14
pH metering pump flow rate ..............................................................................................................................15
pH Power-on delay............................................................................................................................................16
ORP regulation........................................................................................................................................................16
Switching ORP regulation off ............................................................................................................................16
Setting the ORP target value.............................................................................................................................17
Setting the alarm limit values ............................................................................................................................17
Setting the lower ORP alarm.............................................................................................................................17
Setting the upper ORP alarm ............................................................................................................................18
Setting the ORP proportional range ..................................................................................................................18
Meaning of the proportional range ....................................................................................................................19
Setting the maximum ORP metering time.........................................................................................................20

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 3 (44)
ORP Power-on delay.........................................................................................................................................20
Chlorine metering pump flow rate (ORP)..........................................................................................................21
Calibration...............................................................................................................................................................21
Buffer solution....................................................................................................................................................22
Electrodes..........................................................................................................................................................22
Calibrating the pH electrode..............................................................................................................................22
Calibrate current working point or upper value (pH 7). .....................................................................................22
Setting the lower value (pH 4)...........................................................................................................................23
pH calibration errors ..........................................................................................................................................23
Calibrating the ORP electrode...........................................................................................................................23
Calibrating .........................................................................................................................................................24
ORP calibration errors.......................................................................................................................................24
Service settings ......................................................................................................................................................25
Time and date....................................................................................................................................................25
Selecting the language......................................................................................................................................25
Operating hours after the last calibration ..........................................................................................................26
LAN settings ......................................................................................................................................................26
Access control (PIN numbers)...........................................................................................................................26
Reset all settings to factory settings..................................................................................................................27
Adjustment of temperature display....................................................................................................................27
Acoustic error message.....................................................................................................................................28
Increase pH <=> decrease pH ..........................................................................................................................28
Alarm / error message............................................................................................................................................29
Acknowledging an error message.....................................................................................................................29
Measuring chamber colors....................................................................................................................................29
Meaning of the individual colors........................................................................................................................29
Using the osf communication server ...................................................................................................................30
Communication server for pool owners...........................................................................................................30
Registering a new device with the server..........................................................................................................31
Communication server for pool installers........................................................................................................32
Registering a new control unit with the server ..................................................................................................33
Communication server with technical view .....................................................................................................34
Registering a new device with the server..........................................................................................................35
Read device ID on the display of the dosing control.........................................................................................36
Changing the PIN (password)............................................................................................................................37
Assigning a new PIN .........................................................................................................................................37
Naming the unit...................................................................................................................................................38
Entering an e-mail address................................................................................................................................38
Entering an e-mail address ...............................................................................................................................38
Assigning a name..............................................................................................................................................38
Update......................................................................................................................................................................38
Checking for updates .........................................................................................................................................38
Explanations ...........................................................................................................................................................39
Storage, Transport.............................................................................................................................................39
Maintenance............................................................................................................................................................39
6-monthly service ...................................................................................................................................................39
Sealtightness.....................................................................................................................................................39
Dirt filter .............................................................................................................................................................39

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 4 (44)
Injection valves..................................................................................................................................................39
pH electrode ......................................................................................................................................................39
ORP electrode...................................................................................................................................................39
Metering pumps.................................................................................................................................................40
Annual service ........................................................................................................................................................40
Replacing ORP and pH electrodes ...................................................................................................................40
Replacing the metering hose.............................................................................................................................40
Decommissioning...................................................................................................................................................40
Electrodes..........................................................................................................................................................40
Flow fitting .........................................................................................................................................................40
Metering pumps.................................................................................................................................................40
Wear parts ...............................................................................................................................................................40
Interfacing with building automation systems ....................................................................................................41
Shipment of the dosing system ...........................................................................................................................43

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 5 (44)
General
Safety information
Installation and operating manual
This operating manual contains important information which must be observed during installation, operation and
maintenance of the metering unit. For this reason, it is imperative that this operating manual is read by the fitter
and the responsible specialist personnel or equipment owner before installation and initial start-up. It must be
continuously available at the device installation location.
Caution
The metering liquids used are corrosive or highly flammable. The two pressure hose ends at the hose pumps
must never be hanging freely, otherwise corrosive or highly flammable liquids can be discharged.
Canister
The canisters containing the metering liquids must be placed in interception troughs. They may never be
placed directly underneath the controller. Gas-emitting chemicals can cause damage to the sensitive controller.
Personnel qualification
The personnel who will be operating, maintaining, inspecting and installing the device must have appropriate
qualifications for this work. The plant operator must precisely define the areas of responsibility, responsibilities
and monitoring of the personnel. If the personal does not have the required knowledge, they must be trained and
instructed. This can be carried out by the manufacturer or supplier on behalf of the owner if required. Furthermore,
the owner must ensure that the contents of this operating manual have been understood by his personnel in all
respects.
Installation
You have purchased a high-quality measuring, regulating and metering device with the WATERFRIEND. The
device is a precise and sensitive system which needs to be handled carefully at all times. Please handle the
protective cover carefully as well. It may not be allowed to fall down or come into contact with chemicals. The
protective cover should be cleaned using a soft cloth and a little water if necessary.
pH metering
pump
Chlorine
metering pump
Operating
panel
Dirt filter
Overview table for
entering calibrations
carried out
Here, the buffer solutions
are set aside and stored
Measuring chamber
pH sensor
ORP sensor
Drain valve
Measurement
water feed
Measurement water
return

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 6 (44)
All regulations and provisions applicable to the place of installation must be observed during installation. The
swimming pool must be constructed such that a possible technical malfunction, power failure or a defective
metering system may not cause any consequential loss.
Installation
The bottom housing section is fixed vertically and permanently to a solid wall with suitable load-bearing capacity.
Please ensure that the measuring cells are vertical after this has been carried out. The installation location must
be protected against dust and water in order to guarantee correct and proper functioning of the device. The
surrounding temperature must be between -0° C und + 40° C and should be kept as constant as possible.
Humidity at the installation site may not exceed 95%, and no condensation may take place. Please avoid direct
heat or sun irradiation onto the device.
Installation in the water circuit
Please observe all valid safety regulations when carrying out installation work, and ensure that this is carried out
carefully. Disconnect the measuring, regulation and metering device and all other electrical consumers such as
filter pumps and heaters from the power supply.
Chlorine
pH Filter
Chlorine metering
pH metering
Measurement water
Measurement
water return
Filter pump
WATERFRIEND MRD-2
General informational installation in the water circuit
Before carrying out initial start-up, ensure that the injection valves open and close reliably.
All hoses must be routed free of kinks.
Avoid routing hoses over sharp edges.
Connect all hoses carefully and check to ensure that they are tightly fitted to their connections.
Avoid unnecessarily long hose lengths.
Hoses may not be routed directly over pipes carrying heat or over other devices.

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 7 (44)
Electrical power supply
The controller must be mounted protected against moisture in accordance with its protection class. The device
must be powered via a multi-pole main switch with a contact opening width of at least 3mm and a residual current
circuit breaker with IFN30mA. The device must be isolated before opening the housing. Electrical power
supply connections, in addition to alignment and service work, may only be carried out by approved
electricians. The attached circuit diagrams and all applicable safety regulations must be observed.
Low-voltage cables
Low-voltage cables may not be routed together with three-phase or alternating current cables in one cable duct.
Routing of low-voltage cables in the vicinity of three-phase or alternating current cables should generally be
avoided.
Wiring diagram
Steckverbinder connector Steckverbinder connector
Dosierpumpe pH dosing pump pH
Dosierpumpe Chlor dosing pump chlorine Niveau Sensor pH level sensor ORP
Niveau Sensor Chlor level sensor chlorine
Lvl 1 Lvl 2
Netz mains 1 / N / PE 230V 50Hz
N L1
Sicherung
fuse
T2A
Alarm
Freigabe (Filtersteuerung)
enable (pool control)
PWM1 PWM2
Alarm
Externe Pumpe Chlor
external pump chlorine
Externe Pumpe pH
external pump pH
Data+
Data-
RS 485
Service-Terminal
Control Board
Alarm
An external acoustic or optical alarm can be connected to these terminals. These terminals can also be used for
connection to group error messaging systems. The terminals can be loaded with maximum 230V 1A.
External pumps
These connecting terminals are control contacts for external metering pumps. The terminals can be loaded with
maximum 230V 1A.
These outputs deliver clock signals with pulse duty factors that are proportional to the current dosing rate of the
built-in dosing pumps and thus enable the stepless control of external pumps.
For safety reasons, the two outputs are interlocked, i.e. when the pH metering pump is working, the chlorine
metering pump is always switched off.

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 8 (44)
Enabling
These connecting terminals are used for interlocking with a filter control unit. Opening the floating contact within
the filter control unit causes interruption of the metering process.
RS-485
These terminals are used for connection to the Euromatik.net filter control unit. A screened, twisted, 2-core
cable (twisted pair) with a cross-section of at least 0.22 mm2 is required for the connection. (e.g. Li2YCY(TP) 2 x
0.22 mm²). Screening improves the electromagnetic compatibility (EMC). The cable length of the complete bus-
system may not exceed 1200 m. The polarity (DATA+ and DATA) must be observed.
Connecting to EUROMATIK.net
External Touch-Panel
The RS-485 connection terminals are used for data transmission to the EUROMATIK.net. Thus it can be
accessed from the external touch panel of EUROMATIK.net to the water treatment WATERFRIEND MRD-2.
Please note the instruction manual of the EUROMATIK.net.
Connecting to the computer network (optional)
Connection to the Internet is only possible for dosing controls with integrated web server (option) and is
carried out by the communication server. The WATERFRIEND MRD-2 is connected using a standard
Ethernet patch cable into the network wall outlet, the powerline adapter, the wireless LAN access point or other
suitable facilities.
After the WATERFRIEND was connected to an active network outlet, the power supply can be turned on. The
web server in WATERFRIEND now searches autonomously for the communication server and logs on to the
database.
7,20 800
721 675
D -2% D +10%
pH mV
7,20 800
721 675
D -2% D +10%
pH mV
If the "OSF" icon in the monitor is visible (see chart), the WATERFRIEND has logged on to the
communication server.
Network line / patch cable
Network
outlet
LAN
Connection established
OSF
Connected to
communications server

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 9 (44)
Operation
Displays
Temperature
The displayed temperature is the measurement water temperature within the flow fittings. This can deviate from
the actual water temperature in the swimming pool depending on the pipeline routing and surrounding
temperatures.
Measurement water flow quantity
Quantity of water flowing through the measuring chamber.
7,20 800
721 675
D -2% D +10%
pH mV
Child lock OFF Internet Time Temperature Measurement water flow quantity
Current pH value
Target value
Regulation status
Current ORP value
Target value
Regulation status
Current key
function
Current key
function
Confirm selected setting,
save set value
Back.
Cancel without
saving
Back to
basic display

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 10 (44)
Regulation status
In the "Regulation status" fields, additional information about the respective operating status of the individual
controllers is displayed:
Display
Meaning
off
The controller is out of order
D ± xx %
Display of the current dosing rate and the dosing direction
too high
The measured value has exceeded the specified upper alarm limit value.
too low
The measured value has exceeded the specified lower alarm limit value.
flow
The control was temporarily interrupted because the sample water flow rate is
outside the permissible limits and therefore no reliable measurement is
possible.
ext. lock
The regulation was blocked by the enable signal of the filter control.
delay
The control is not yet active because the switch-on delay for stabilizing the
measured values has not yet ended
tank
The chemicals canister is empty.
pH too high
The chlorine dosing is temporarily blocked because the pH value is too high
for reliable chlorine control.
pH too low
The chlorine dosing is temporarily blocked because the pH value is too low
for reliable chlorine control.
dos. time
Dosing is blocked because the specified maximum dosing time has been
exceeded. After eliminating the cause of the error, this error message
must be acknowledged by pressing the start button on the info page.
meas. err
Dosing is blocked because the sensor is not delivering a valid measured
value.
pH problem
The chlorine dosing is blocked because the pH sensor is not delivering a valid
measured value.
transmitt.
Dosing is blocked because the measured value transmitter is not working.
error
Dosing is blocked because the control electronics are not working.
Child lock
This symbol shows the child lock status
OFF ON
The child lock is switched off as supplied.
To switch off child lock, press the
HOME
key for 5 seconds
To switch child lock on, press the
HOME
key for 5 seconds
All keys are blocked if the child lock is switched on! Only the
ESC
key is active and enables querying of the device
type.

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 11 (44)
Professional level
The WATERFRIEND offers protection against unauthorised
changes to important operating parameters.
This safety function is activated as supplied. All the
parameters marked with X in the display are blocked.
Safety function OFF Safety function ON (no symbol)
To switch the safety function off, press the , and keys simultaneously.
The safety function switches itself on again automatically one hour after the last time one of these keys was
actuated.
Bleed metering hose
The WATERFRIEND offers the facility for switching the
metering pump on manually so that the meeting hoses can be
bled.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "hand dosage" by pressing the keys or .
Press the
OK
key.
Each metering pump can be switched on and off individually
by pressing the appropriate keys. While doing so, please
observe the corresponding status display. The maximum
runtime is limited to 60 seconds. Once this time has elapsed,
the pumps will be switched off automatically. The remaining
runtime is shown graphically in the display.
Runtime
pH regulation
Switching off pH regulation
In the menu there is a setting to turn on and off the automatic
pH control.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "operating mode" by pressing the keys or .
Press the
OK
key.
7,20 700
721 675
Stop Stop
pH mV
7,20 800
721 675
D -2% D +10%
pH mV
7,20 800
721 675
D -2% D +10%
pH mV
X start delay 10
X comm. adress 1
X factory settings
X temperature correct.

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 12 (44)
By pressing the arrow keys and the cursor can be
moved and the desired operating mode can be selected.
Operating mode:
OFF or AUTO
Press the
OK
key to save the settings.
Setting the pH target value
There is a setting facility for the required pH value in the
menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "setpoint" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the target value.
The maximum and minimum possible values are shown right
and left in the display.
Setpoint
Press the
OK
key to save the settings.
Setting the alarm limit values
These settings may only be adjusted by a specialist.
Setting the lower pH alarm
There is a setting facility for the required alarm limit value in
the menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "lower alarm" by pressing the keys or .
Press the
OK
key.
7,20 800
721 675
D -2% D +10%
pH mV
MIN MAX
6,8 7,8
7,20
7,20
7,20 800
721 675
D -2% D +10%
pH mV
Operation mode OFF
AUTO
Factory setting: AUTO

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 13 (44)
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the target value.
The maximum and minimum possible values are shown right
and left in the display.
Target value
Press the
OK
key to save the settings.
Setting the upper pH alarm
There is a setting facility for the required alarm limit value in
the menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "upper alarm" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the target value.
The maximum and minimum possible values are shown right
and left in the display.
Target value
Press the
OK
key to save the settings.
Setting the pH proportional range
The controller offers the facility for setting the regulation proportional range in order to adapt the WATERFRIEND
to the requirements of the specific swimming pool. This value influences the delivery quantity by optimising the
pulse-width modulation. This means that the duty cycle is modulated at constant frequency. The numeric value
specifies the regulating conductance. At a deviation of the measured actual value from the desired value, which is
greater than the P range, the metering pump operates with maximum power. If the actual value approaches the
target value inside the proportional range, the metering performance decreases proportionally. This means that
the pump is working at reduced power.
Increasing the p-range leads to a slower approach to the target value with less overshoot.
MIN MAX
3,0 7,2
6,80
6,80
7,20 800
721 675
D -2% D +10%
pH mV
MIN MAX
7,20 9,90
7,30
7,60
The proportional range may only be adjusted by a specialist.
Factory setting: 6,0
Factory setting: 8,0

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 14 (44)
Metering pump
flow rate in %
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "p-range" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the proportional
range. The maximum and minimum possible values are shown
right and left in the display.
Proportional range
Press the
OK
key to save the settings.
Meaning of the proportional range
Adjustment
Benefits
Disadvantages
Diagram
Small P-range
Fast, accurate control
When switching on an overshoot
can occur
Wide P-range
No overshoot
Slow control, small deviations
between desired and actual
values possible
Setting the maximum pH metering time
The metering time limit is a safety function and prevents dangerous overdosing in cases of breakdown. Attention!
The higher the maximum dosing time is set, the more acid can be released in an uncontrolled manner in case of
any damage of the dosing tube.
MIN MAX
0,10 2,00
1,00
1,00
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 1,00

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 15 (44)
The metering time must be adapted to the actual pool size.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "max. dosage time" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the maximum
time. The maximum and minimum possible values are shown
right and left in the display.
Max. Time
Press the
OK
key to save the settings.
pH metering pump flow rate
The integrated speed control for the metering pumps enables
optimum adaptation of the regulation to the pool size.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "pH pump [l/h]" by pressing the keys or .
Press the
OK
key.
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 60 minutes
MIN MAX
1300
30
30
7,20 800
721 675
D -2% D +10%
pH mV

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 16 (44)
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the capacity.
The maximum and minimum possible values are shown right
and left in the display.
Capacity
Press the
OK
key to save the settings.
pH Power-on delay
The controller only starts up after a delay period once the power supply has been provided and once external
enable has been switched on (e.g. filter control unit). This power-on delay is necessary because a period specific
to the overall system elapses once the filter pumps have been switched on before the completely mixed water
reaches the sensors. This mixing process is mainly dependent on the pool size, the dimensions of the filter pump,
the pipe length and the filter itself.
The delay period can, if required, be adapted to the actual
pool size.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set pH" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "delay pH" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the delay (in
minutes). The maximum and minimum possible values are
shown right and left in the display.
Delay
Press the
OK
key to save the settings.
ORP regulation
Switching ORP regulation off
In the menu there is a setting to turn on and off the automatic
redox regulation.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
MIN MAX
0,2 10,0
2,5
15
Factory setting: 1,5 l/h
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 30 minutes
7,20 800
721 675
D -2% D +10%
pH mV
MIN MAX
1120
30
30

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 17 (44)
Press the
OK
key.
Move the cursor (blue backed text) to the line "operating mode" by pressing the keys or .
Press the
OK
key.
By pressing the arrow keys and the cursor can be
moved and the desired operating mode can be selected.
Operating mode:
OFF or AUTO
Press the
OK
key to save the settings.
Setting the ORP target value
There is a setting facility for the required ORP value in the
menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "setpoint" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the target value.
The maximum and minimum possible values are shown right
and left in the display.
Target value
Setting the alarm limit values
These settings may only be adjusted by a specialist.
Setting the lower ORP alarm
There is a setting facility for the required alarm limit value in
the menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "lower alarm" by pressing the keys or .
Press the
OK
key.
7,20 800
721 675
D -2% D +10%
pH mV
MIN MAX
300 900
800
700
7,20 800
721 675
D -2% D +10%
pH mV
Operation mode OFF
AUTO

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 18 (44)
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the limit. The
maximum and minimum possible values are shown right and
left in the display.
Alarm limit
Press the
OK
key to save the settings.
Setting the upper ORP alarm
There is a setting facility for the required alarm limit value in
the menu.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
Move the cursor (blue backed text) to the line "upper alarm" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the limit. The
maximum and minimum possible values are shown right and
left in the display.
Alarm limit
Press the
OK
key to save the settings.
Setting the ORP proportional range
The controller offers the facility for setting the regulation proportional range in order to adapt the WATERFRIEND
to the requirements of the specific swimming pool. This value influences the delivery quantity by optimising the
pulse-width modulation. This means that the duty cycle is modulated at constant frequency. The numeric value
specifies the regulating conductance. At a deviation of the measured actual value from the desired value, which is
greater than the P range, the metering pump operates with maximum power. If the actual value approaches the
target value inside the proportional range, the metering performance decreases proportionally. This means that
the pump is working at reduced power.
Increasing the p-range leads to a slower approach to the target value with less overshoot.
MIN MAX
800 999
750
750
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 800mV
Factory setting: 400mV
MIN MAX
0800
680
550
The proportional range may only be adjusted by a specialist.

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 19 (44)
Metering pump
flow rate in %
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "P-range" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the proportional
range. The maximum and minimum possible values are shown
right and left in the display.
P-range
Press the
OK
key to save the settings.
Meaning of the proportional range
Adjustment
Benefits
Disadvantages
Diagram
Narrow P-range
Fast, accurate control
When switching on, an overshoot
can occur
Wide P-Range
No overshoot
Slow control, small deviations
between desired and actual
values possible
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 100mV
MIN MAX
10 200
100
100

Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 20 (44)
Setting the maximum ORP metering time
The dosing time is a safety feature and prevents dangerous overdosing in case of failure. Attention! The larger the
maximum dosing time is set, the more chlorine solution can be released in an uncontrolled manner in case of any
damage to the dosing tube!
The metering time must be adapted to the actual pool size.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
Press the "NEXT" key
Move the cursor (blue backed text) to the line "max. dosage time" by pressing the keys or .
Press the
OK
key.
You can move the cursor by pressing the arrow keys and
and also use the and arrow keys to set the time limit.
The maximum and minimum possible values are shown right
and left in the display.
Max. time
Press the
OK
key to save the settings.
ORP Power-on delay
The controller only starts up after a delay period once the power supply has been provided and once external
enable has been switched on (e.g. filter control unit). This power-on delay is necessary because a period specific
to the overall system elapses once the filter pumps have been switched on before the completely mixed water
reaches the sensors. This mixing process is mainly dependent on the pool size, the dimensions of the filter pump,
the pipe length and the filter itself.
The delay period can, if required, be adapted to the actual
pool size.
Procedure: Press the "MENU" key
Move the cursor (blue backed text) to the line "set ORP" by pressing the keys or .
Press the
OK
key.
MIN MAX
1300
30
30
7,20 800
721 675
D -2% D +10%
pH mV
Factory setting: 60 minutes
7,20 800
721 675
D -2% D +10%
pH mV