oventrop Regumaq X-25 User manual

Valves, controls + systems
Operating instructions
EN Fresh water station “Regumaq X-25”

“Regumaq X-25” Contents
3
138112581-V01.10.2019
1. General information ................................................................................................................6
1.1 Validity of the operating instructions .........................................................................................6
1.2 Type plate ..................................................................................................................................6
1.3 Extent of supply ........................................................................................................................6
1.4 Contact......................................................................................................................................6
1.5 Declaration of conformity..........................................................................................................6
1.6 Used symbols............................................................................................................................6
2. Safety-related information......................................................................................................7
2.1 Correct use................................................................................................................................7
2.2 Modicationstotheproduct .....................................................................................................7
2.3 Warnings ...................................................................................................................................7
2.4 Safety notes ..............................................................................................................................8
2.4.1 Danger to life due to development of legionella ......................................................................................8
2.4.2 Danger to life due to electric current........................................................................................................8
2.4.3 Dangerincaseofinadequatepersonnelqualication............................................................................. 8
2.4.4 Risk of scalding due to hot water ............................................................................................................8
2.4.5 Risk of injury from pressurised components............................................................................................ 8
2.4.6 Riskofburnsduetoanuncontrolledescapeofhotuids ......................................................................8
2.4.7 Risk of burns due to hot components and surfaces................................................................................ 8
2.4.8 Risk of injury due to the weight of the product........................................................................................8
2.4.9 Risk of injury in case of improper work....................................................................................................8
2.4.10 Damage to property due to an unsuitable installation location ...............................................................9
2.4.11 Damage to property due to incorrect operation ......................................................................................9
2.4.12 Availability of the operating instructions ..................................................................................................9
3. Technical description ............................................................................................................10
3.1 Construction............................................................................................................................10
3.2 Functional description.............................................................................................................12
3.3 System diagram ......................................................................................................................12
3.4 Example of the application......................................................................................................14
3.5 Technical data .........................................................................................................................14
3.5.1 Front view............................................................................................................................................... 16
3.5.2 Side view................................................................................................................................................17
3.5.3 Wall bracket ...........................................................................................................................................18
3.6 Controller terminal assignment ...............................................................................................19
4. Accessories and spare parts................................................................................................20
4.1 Potable water circulation set...................................................................................................20
4.2 Sealing set...............................................................................................................................20
4.3 Load relay................................................................................................................................20
4.4 Water sampling valve Aquastrom P ........................................................................................20
Content
Page

Contents “Regumaq X-25”
4138112581-V01.10.2019
4.5 Non-return check valve
Aquastrom R .......................................................................................................................... 21
4.6 Strainer................................................................................................................................... 21
4.7 WaterlterAquanovaMagnum.............................................................................................. 21
4.8 Grounding clip........................................................................................................................ 21
4.9 Connectionttings ................................................................................................................. 21
5. Transport and storage.......................................................................................................... 22
6. Installation............................................................................................................................. 22
6.1 Advice regarding installation .................................................................................................. 22
6.2 Wall attachment of the station................................................................................................ 23
6.2.1 Required tools....................................................................................................................................... 23
6.2.2 Installation............................................................................................................................................. 23
6.3 Pipework ................................................................................................................................ 25
6.4 Protective equipotential bonding/Grounding ......................................................................... 27
7. Commissioning..................................................................................................................... 28
7.1 Filling and bleeding of the storage cylinder circuit................................................................. 28
7.2 Filling and bleeding of the potable water circuit .................................................................... 29
7.3 Electrical connection.............................................................................................................. 29
7.3.1 Power supply via pre-assembled power supply cable ......................................................................... 30
7.3.2 Power supply without pre-assembled power supply cable.................................................................. 30
7.4 Congurationofthecirculationfunction(optional) ................................................................ 32
7.4.1 Activation of the circulation function..................................................................................................... 32
7.4.2 Operating mode of the circulation pump .............................................................................................. 32
7.5 Handover to the user.............................................................................................................. 33
8. Operation .............................................................................................................................. 34
8.1 Setting of the nominal hot water temperature........................................................................ 34
8.2 Emergencyoperation(manualoperation) .............................................................................. 34
8.3 Anti-lock protection................................................................................................................ 35
8.4 Displays.................................................................................................................................. 35
8.4.1 Error messages on the display.............................................................................................................. 35
8.4.2 Control LED........................................................................................................................................... 35
8.5 Replacement of the fuse ........................................................................................................ 35
9. Troubleshooting.................................................................................................................... 37
9.1 Troubleshooting table............................................................................................................. 37
9.2 Nominal resistances of the temperature sensors................................................................... 38
9.3 Decalcicationoftheheatexchanger.................................................................................... 39
9.3.1 Decalcicationofthepotablewatersideafterinstallation ................................................................... 39
9.3.2 Cleaningoftheheatexchanger(storagecylindercircuitside) ............................................................. 40
9.3.3 Decalcicationofthedismountedheatexchanger............................................................................... 41
9.4 Cleaningoftheowsensor.................................................................................................... 42
9.4.1 Required tools....................................................................................................................................... 42
9.4.2 Cleaning of the measuring turbine........................................................................................................ 42

“Regumaq X-25” Contents
5
138112581-V01.10.2019
10. Maintenance ..........................................................................................................................45
10.1 Maintenance............................................................................................................................45
10.1.1 Leakcheck(visualinspection) ...............................................................................................................45
10.1.2 System pressure check.......................................................................................................................... 45
10.1.3 Functionalcheckofthesafetyvalves(potablewatercircuit) ................................................................45
10.1.4 Water sampling ......................................................................................................................................45
10.1.5 Actuation of the four isolating ball valves ..............................................................................................45
10.1.6 Electronic components and plug-in connections ..................................................................................45
10.1.7 Functional check of the check valve of the circulation set ....................................................................45
10.1.8 Replacementofthepotablewaterlterinsert.......................................................................................46
11. Advice for the user ................................................................................................................46
12. Removal and disposal...........................................................................................................47
12.1 Dismantlingofthetting .........................................................................................................47
12.1.1 Disconnection of the station from the power supply ............................................................................. 47
12.1.2 Removal of the station ........................................................................................................................... 47
12.2 Disposal...................................................................................................................................47
13. Illustration index ....................................................................................................................48
14. Appendix ................................................................................................................................50
14.1 Characteristic line for Wilo circulation pump ..........................................................................50
14.2 Characteristic lines for potable water heating.........................................................................51
14.2.1 Heatingofpotablewaterfrom10°Cto45°C .......................................................................................51
14.2.2 Heatingofpotablewaterfrom10°Cto50°C .......................................................................................52
14.2.3 Heatingofpotablewaterfrom10°Cto55°C .......................................................................................53
14.2.4 Heatingofpotablewaterfrom10°Cto60°C .......................................................................................54
14.2.5 Heatingofpotablewaterfrom10°Cto65°C .......................................................................................55
14.2.6 Heatingofpotablewaterfrom10°Cto70°C .......................................................................................56
14.2.7 Heatingofpotablewaterfrom10°Cto75°C .......................................................................................57
14.3 EU Declaration of conformity ..................................................................................................58
15. Advice regarding corrosion protection ...............................................................................59
16. Handover report ....................................................................................................................61
17. Maintenance report...............................................................................................................63

General information “Regumaq X-25”
6138112581-V01.10.2019
1. General information
The original operating instructions were drafted in
German.
The operating instructions in other languages have been
translated from German.
1.1 Validity of the operating
instructions
These operating instructions apply to the “Regumaq
X-25” station for hot potable water preparation.
1.2 Type plate
Thetypeplateisafxedexternallytothebottomleftof
the front insulation shell.
1.3 Extent of supply
Please check your delivery for any damage caused
during transit and for completeness.
Items included in the delivery:
• Product assembly with controller
• Fixing material
• Angled wall bracket
• 4x ring gaskets
• Operating instructions
1.4 Contact
OVENTROP GmbH & Co. KG
Paul-Oventrop-Straße 1
59939 Olsberg
GERMANY
Technical services
Telephone: [phone]
1.5 Declaration of conformity
Oventrop GmbH & Co. KG hereby declares that this
product complies with the basic requirements and other
relevant provisions of the EC Directives concerned.
The declaration of conformity can be obtained from the
manufacturer.
1.6 Used symbols
Highlights important information and further
explanations.
fAction required
• List
1.
2.
Fixed order. Steps 1 to X.
Result of action

“Regumaq X-25” Safety-related information
7
138112581-V01.10.2019
2. Safety-related information
2.1 Correct use
Operating safety is only guaranteed if the product is
used correctly.
The station is an electronically controlled product
assemblywithheatexchangerfordomesticuse(e.g.
rentalunitsinresidentialandcommercialbuildings).The
product assembly serves the supply of heated potable
water(hotwater).
Use the product:
• In a technically perfect condition.
• At installation locations which are directly connected
to the public low-voltage network
The passage of media other than heating water through
the storage cylinder and fresh water through the pota-
ble water circuit will be considered incorrect. A direct
connection of the fresh water station to local and/or dis-
trict heating networks may lead to malfunctions. Parallel
operation with other heating system components such
as heating circuit stations is not permitted.
Any other use of the product will be considered incor-
rect use.
Claims of any kind against the manufacturer and/or its
authorised representatives due to damage caused by
incorrect use will not be accepted.
Observance of the operating instructions is part of com-
pliance with correct use.
2.2 Modi cations to the product
Modicationstotheproductarenotpermitted.Inthe
caseofmodicationstotheproduct,thewarrantywill
become void. The manufacturer will not accept liability
fordamageandbreakdownscausedbymodications
to the product.
2.3 Warnings
Each warning contains the following elements:
Warning symbol SIGNAL WORD
Type and source of danger!
Possible consequences if the danger occurs or
the warning is ignored.
fPossibilities of avoiding the danger.
The signal words identify the severity of the danger
arising from a situation.
DANGER
Indicates an imminent danger with high risk.
The situation will lead to death or serious injury
if not avoided.
WARNING
Indicates a possible danger with moderate risk.
The situation may lead to death or serious injury
if not avoided.
CAUTION
Indicates a possible danger with lower risk. The
situation may lead to minor and reversible injury
if not avoided.
NOTICE
Indicates a situation that may lead to damage
to property if not avoided.

Safety-related information “Regumaq X-25”
8138112581-V01.10.2019
2.4 Safety notes
The product is manufactured in accordance with the
latest technical standards and is safe to use. However,
residual dangers to people and property may occur
during installation and operation.
2.4.1 Danger to life due to development of
legionella
The following must be ensured:
• The potable water temperature in the cold water
risermustnotexceed25°C.
• The water in the potable water circuit must be ex-
changed completely at least once every 72 hours.
• The hot water temperature must not drop below
60°Cwhenusingacirculationpipe.Thetempera-
ture difference between the hot water outlet of the
heat exchanger and the return of the circulation pipe
atthestationmustnotexceed5°C.
2.4.2 Danger to life due to electric current
fEnsure that the product can be disconnected from
the power supply at any time.
fDo not put the product into operation if there are
visible signs of damage.
The controller only has to be opened when
using accessory components. This means that
work on the power supply is only necessary
when using accessory components.
Any work on the power supply may only be carried out
byaqualiedelectrician.
fCompletely disconnect the product from the power
supply and protect it against accidental restart.
fCheck that no voltage is present.
fThe product may only be installed in dry indoor
areas.
2.4.3 Danger in case of inadequate personnel
quali cation
Any work on this product must only be carried out by
qualiedtradesmen.
As a result of their professional training and experience
as well as their knowledge of the relevant legal regu-
lations,qualiedtradesmenareabletocarryoutany
work on the described product professionally.
User
The user must be informed how to operate the product
byaqualiedinstaller.
2.4.4 Risk of scalding due to hot water
The setting or a defect of the controller may entail a rise
in the hot water temperature at the draw-off points up
to the heating water temperature in the buffer storage
cylinder.
AccordingtoDINEN806andDIN1988,alldraw-
off points must be provided with protection against
scalding if there is a risk of scalding due to high heating
water temperatures in the buffer storage cylinder.
In case of low heating water temperatures in the buffer
storage cylinder and resulting low hot water tempera-
tures without risk of scalding at the draw-off points, the
user of the system has to be instructed so that the low
heating water temperature in the buffer storage cylinder
is guaranteed throughout the year.
2.4.5 Risk of injury from pressurised
components
fBefore starting work on the heating circuit or the
potable water circuit, make sure that the system is
depressurised.
fObserve the permissible operating temperatures
during operation.
fInstall a safety valve without isolating facility in the
potablewaterheatinginstallation(DINEN806-2).
2.4.6 Risk of burns due to an uncontrolled
escape of hot  uids
fBefore starting work on the heating circuit or the
potable water circuit, make sure that the system is
depressurised.
fBefore starting work, let the product cool down.
fCheck that the product is not leaking after work is
complete.
fWear safety goggles.
2.4.7 Risk of burns due to hot components and
surfaces
fAllow the product to cool down before working on it.
fWear protective clothing to avoid unprotected con-
tact with hot system components.
2.4.8 Risk of injury due to the weight of the
product
fAlways wear safety shoes during installation.
2.4.9 Risk of injury in case of improper work
Stored residual energies, angular components, points,
and edges on and in the product may cause injuries.
fBefore starting work, make sure that there is enough
space.
fHandle open and hard-edged components with
care.
fMake sure that the work place is tidy and clean to
avoid accidents.

“Regumaq X-25” Safety-related information
9
138112581-V01.10.2019
2.4.10 Damage to property due to an unsuitable
installation location
fDo not install the product in locations prone to frost.
fDo not install the product in wet or damp environ-
ments.
fDo not install the product in spaces with corro-
sion-enhancing ambient air. Observe the advice
regardingcorrosionprotection(seeappendix).
fEnsure that the product is not exposed to any sourc-
es of strong electromagnetic radiation.
2.4.11 Damage to property due to incorrect
operation
fDo not close the secondary ball valves during oper-
ation.
2.4.12 Availability of the operating instructions
These operating instructions and all other relevant
documents(e.g.operatinginstructionsofaccessories)
must be read and applied by any person working on the
product.
The operating instructions must be available at the
installation location.
fHand these operating instructions and all other
relevantdocuments(e.g.accessorymanuals)overto
the user.

Technical description “Regumaq X-25”
10 138112581-V01.10.2019
3. Technical description
3.1 Construction
3
2
4
7
6
5
15
8
1
9
10
11
12
13
14
18 17 19 16
Illust. 1: “Regumaq X-25”

“Regumaq X-25” Technical description
11
138112581-V01.10.2019
(1) Temperature sensor for potable hot water S2
(2) Temperature sensor for storage cylinder circuit S1
(3) Heat exchanger
(4) Fill and drain ball valve for potable cold water
(5) Flow sensor for potable water circuit VTY 20
(6) Fill and drain ball valve for storage cylinder circuit return
(7) Isolating ball valve for potable hot water
(8) Wall bracket
(9) Isolating ball valve for potable cold water
(10) Safetyvalveforpotablewatercircuit(10bar)
(11) Connection for circulation pipe
(12) Temperature sensor for potable cold water / circulation, S3
(13) Storage cylinder circuit circulation pump
(14) Controller
(15) Non-return check valve in storage cylinder circuit
(16) Isolating ball valve for storage cylinder circuit return
(17) Fill and drain ball valve for potable hot water
(18) Isolating ball valve for storage cylinder circuit supply
(19) Fill and drain ball valve for storage cylinder circuit supply

Technical description “Regumaq X-25”
12 138112581-V01.10.2019
3.2 Functional description
The “Regumaq X-25” is an electronically controlled
product assembly complete with heat exchanger for
potablewaterheatingaccordingtothecontinuousow
principle. Potable water is only heated up when it is
needed. This station dispenses with the need to store
hot potable water in a storage cylinder. The station
facilitates a demand-based heat supply – even when
potable water consumption is very low.
The integrated heat exchanger provides a system sepa-
ration between the potable water circuit and the storage
cylinder circuit.
Ataxedpotablewatertemperatureof60°Canda
storagecylindertemperatureof75°C,thehotpotable
water discharge capacity can vary between
1and25l/min.Thisisprovidedbymeansofthecon-
trollerregulatingthecirculationpumptoa(variable)
speed in order to feed heating water from the con-
nected buffer storage cylinder to the heat exchanger
as needed. The controller calculates the pump speed
necessary to achieve the desired potable water temper-
ature on the basis of the actual values for the volume
owandthetemperature(ofthepotablewater)record-
ed by the sensors.
Example:
A simultaneous draw-off at several delivery points and
the associated higher consumption of hot potable water
directly triggers a higher pump speed to feed more
heating water into the heat exchanger. This transfers
more heat to the potable water circuit accordingly.
3.3 System diagram
13
24
5
Illust. 2: System diagram with one “Regumaq X-25” fresh water station

“Regumaq X-25” Technical description
13
138112581-V01.10.2019
13
24
4
3
5
Illust. 3: System diagram with two “Regumaq X-25” fresh water stations
(1) Heat generator
(2) Buffer storage cylinder
(3) “Regumaq X-25”
(4) “Aquastrom R” non-return check valve
(5) “AquanovaMagnum”waterlter
Storage cylinder circuit supply
Storage cylinder circuit return
Potablecoldwater(PWC)
Potablehotwater(PWH)
Directionofow
When operating several “Regumaq X-45” stations in parallel, connect the stations to the pipework ac-
cording to the Tichelmann system to guarantee a constant circulation through the stations with the lowest
possible resistance.

Technical description “Regumaq X-25”
14 138112581-V01.10.2019
3.5 Technical data
General information
Max. operating pres-
sure (ps)
10 bar
Max. operating tem-
perature (ts)
95°C
Ambient temperature 2–35°C
Empty weight Approx.13kg
Connections
Storage cylinder
circuit, potable water
circuit, circulation
G1 male thread high
sealing level
Fill and drain ball
valves
G ¾male thread, for
hose connections
Storage cylinder circuit
Fluid Heating water in accor-
dancewithVDI2035/
ÖNORMH5195-1;uid
category≤3inaccor-
dancewithEN1717;see
Oventrop information
sheet on corrosion pro-
tection in the appendix
kv value 2,67 m3/h
Pump Wilo Para 15-130/8-75/
UN-9
Power consumption
duringoperation2–75W
Potable water circuit
Fluid Potablewater(seeOven-
trop information sheet on
corrosion protection in
theappendix)
Notice
Damage to measur-
ing turbine caused by
chemical inuences!
Water treatment additives
in high concentrations
can damage the measur-
ing turbine.
fEnsure that the
permitted limits for
potable water are not
exceeded.
Discharge capacity
(where Δ T = 15K)
1–25 l/min
kv value 1.88 m3/h
Safety valve 10 bar
- General temperature
range:
- Controller presetting:
20–75°C
20–60°C
Material
Valves and ttings Brass/dezincication-re-
sistant brass
Seals Fibre material
Insulation EPP
Pipes Stainless steel 1.4404
3.4 Example of the application
Designtemperatures:60°Chotwater;75°Cowtemperaturestoragecylindercircuit
(designaccordingtoDIN1988-300)
Number
of “X-45”
stations
Residential
building
Hospital
room
Hotel
room
Communal shower
facility
Buffer
storage
cylinder
volume
[l]
Re-
quired
boiler
capacity
[kW]
1Washbasin(WB)
1Kitchensink(KS)
1Shower(S)
1 WB
1 S
1 WB
1 S
Numberofshowersat6l/
min60°PWH
(Simultaneityfactor80%)
13 4 3 5 500 17
214 19 12 10 800 33

“Regumaq X-25” Technical description
15
138112581-V01.10.2019
Heat exchanger
copper brazed
Plates: Stainless steel
1.4401
Connections: Stainless
steel 1.4404
Brazing material: Copper
Heat exchanger
copper-brazed, with
Sealix® protective
layer
Plates: Stainless steel
1.4401
Connections: Stainless
steel 1.4404
Brazing material: Copper
Protective layer: SIO2-
based
Dimensions
Width/Height/Depth 400/625/240 mm
Pipe distance to con-
nections (primary)
100 mm
Pipe distance to con-
nections (secondary)
250 mm
Centre distance to wall
(primary)
105 mm
Centre distance to wall
(secondary)
65 mm
Distance between seal-
ing surfaces
Primary to secondary
side
565 mm
Tightening torques
G¾collar nuts 45 Nm
G1 collar nuts 45 Nm
Temperature sensor 15 Nm
Flow sensor 15 Nm
Controller
Inputs 3x Pt1000 temperature
sensors,1xSikaow
sensor
Outputs 1x solid-state relay and
1x PWM output
Switching capacity 1(1)A240V~(solid-state
relay)
Total switching capac-
ity
1A240V~
Supply 100–240V~(50–60Hz)
Type of connection X
Operation mode Type 1.C.Y
Rated surge voltage 2.5 kV
Fuse T4AH250V
Data interface LIN bus
Housing Plastic, PC-ABS and
PMMA
Display 2x 7-segment displays,
1x operating control LED
Operation 2 buttons
Protection IP 22/ DIN EN 60529
Protection class I
Degree of contamina-
tion
2
Dimensions 183 x 203 x 54 mm

Technical description “Regumaq X-25”
16 138112581-V01.10.2019
3.5.1 Front view
400
250
100175
80
25
625
565
Illust. 4: “Regumaq X-25” dimensions in mm (front)

“Regumaq X-25” Technical description
17
138112581-V01.10.2019
3.5.2 Side view
240
105
65
625
Illust. 5: “Regumaq X-25” dimensions in mm (side)

Technical description “Regumaq X-25”
18 138112581-V01.10.2019
3.5.3 Wall bracket
120
225 175
400
625
410 215
Illust. 6: “Regumaq X-25” dimensions in mm (wall bracket)

“Regumaq X-25” Technical description
19
138112581-V01.10.2019
3.6 Controller terminal assignment
PWM
S1 S2 S3
100 – 240 V
T4A
50-60 Hz
R1|1 (1) A 240 V~
GND
SikaSensors LIN-Bus
GND Signal V 10V 10V
PE NR1 PE NL' PE N
L' PE NL
IP 22
X-25
VN: 1.0
Paul-Oventrop-Straße 1
D-59939 Olsberg
LNPE
Illust. 7: Terminal allocation
Sensors
S1 Storage cylinder supply Connections for the temperature sensors with any polarity at
terminals S1 to S3.
S2 Hot water
S3 Cold water
Control output for a high-efciency pump
PWM Controloutputforahigh-efciencypump.
Flow sensor
10 V Connectionfortheowsensorobserving the prescribed po-
larity at the 10 V,
V
and GND terminals.
Volumeow
GND
Interface for LIN bus pump
10 V Connection for the LIN bus pump observing the prescribed polarity at the 10 V, GND and signal termi-
nals.
GND
Signal
Power supply 100–240 V~ (50–60 Hz)
PE Earth conductor
NNeutral conductor
R1 Conductor relay 1
PE Earth conductor
NNeutral conductor
L‘ Phase(permanentlylive,fusedcontact)
PE Earth conductor
NNeutral conductor
L‘ Phase(permanentlylive,fusedcontact)
PE Earth conductor
NNeutral conductor
LPower supply phase

Accessories and spare parts “Regumaq X-25”
20 138112581-V01.10.2019
4. Accessories and spare parts
Youcanndthecurrentaccessoriesandspare
part list on our homepage.
www.oventrop.com/qr/1381125
CAUTION
Risk of injury from incorrect accessories
and spare parts!
Incorrect or faulty accessories and spare parts
may lead to damages, operational failure and
malfunctions, which increases the risk of injury.
fOnly use original spare parts from the man-
ufacturer.
fAs far as possible, only use original ac-
cessories from the manufacturer or other
suitable accessories.
4.1 Potable water circulation set
Accessories Item no.
Potable water circulation
set with pump
1381150
Potable water circulation
set without pump
1381152
4.2 Sealing set
Accessories Item no.
Sealing set 5 X G1 1344498
Sealing set 5 X G ¾ 1344497
4.3 Load relay
Ifcomponents(suchaspumpsorelectricalimmersion
heater)witharatedcurrentexceeding1ampereare
connected to the controller, this may cause damage to
the controller. In this case, the Oventrop load relay must
be inserted between.
Illust. 8: Load relay (item no. 1152089)
4.4 Water sampling valve Aquastrom P
Illust. 9: Water sampling valve
Size Connection Item no.
DN 8 G ¼ M 4209102
DN 10 G ⅜ M 4209103
The lower shell contains a bracket for the dis-
chargeelbowofthewatersamplingvalve(see
Illust.16onpage25).