Watts Industries Isomix-HC User manual

Isomix-HC
Control station for load-based control of the flow
temperature in surface heating/cooling systems
Installation and Operating Manual
(translated from the original operating manual)
Issued 10/2018 Revision 1
Watts Industries Deutschland GmbH
Godramsteiner Hauptstr. 167
76829 Landau, Germany
Tel.: [phone]
[e-mail]
WattsWater.de

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Contents
1 General information...................................... 2
1.1 Important information about this installation and operating
manual ..................................................................................2
1.2 Product conformity .........................................................2
1.3 Product features..............................................................2
1.4 Product labeling ..............................................................2
2 Technical data ............................................... 3
3 Safety.............................................................. 4
3.1 Presentation of safety information ...................................4
3.2 Important safety information ...........................................4
3.3 Intended use...................................................................4
3.4 Foreseeable misuse ........................................................4
3.5 Responsibilities of the plant operator..............................5
3.6 Personnel groups............................................................5
3.7 Information on the operating environment.......................5
4 Structure ........................................................ 5
5 Function.......................................................... 6
6 Installation and commissioning .................. 6
6.1 Installation .......................................................................7
6.2 Initial commissioning.......................................................9
6.3 Use in combination with Watts Heat Interface Unit HIU 2 10
7 Pressure loss curve .....................................11
8 Maintenance ................................................ 12
8.1 Annual maintenance...................................................... 12
8.2 Replacement of wear parts........................................... 12
9 Troubleshooting........................................... 13
10 Spare parts list...........................................14
11 Disposal.......................................................14
11.1 Return to the manufacturer.......................................... 14
11.2 Notification of administrative bodies and the manufacturer 14
12 Warranty......................................................14
1 General information
1.1 Important information about the installa-
tion and operating manual
The plant operator is responsible for
ensuring compliance with the local laws
and regulations
(e.g. accident prevention regulations,
etc.).
Incorrect operation or operating the
Isomix outside the specifications
invalidates all warranty claims.
This installation and operating manual
• is an integral part of the Isomix
• contains instructions and information about safe and
correct installation and commissioning of the Isomix
• must be available to all users throughout the entire service
life of the Isomix
• is intended for trained personnel who are familiar with the
applicable standards and regulations and, in particular,
with the relevant safety concepts, operation and
maintenance of the Isomix
• is protected by copyright and may not be altered without
the manufacturer’s permission
• may not be made accessible to unauthorized persons,
either in original form or as a copy.
1.2 Product conformity
A Declaration of Conformity according to Machinery Directive
2006/42/EC has been issued for the Isomix product.
1.3 Product features
• All connections to the system with 1" male thread and flat
sealing
• Very convenient controls, compact, space-saving design.
1.4 Product labeling
HC

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2 Technical data
Electrical connection
Operating voltage
230 V
Frequency
50 Hz
Nominal heat output
approx. 14 kW
Hydraulic performance data
Max. operating pressure
6 bar
Max. ambient temperature
40°C
Max. operating temperature
80 °C
Control range of flow temperature
5 – 100 °C
Media
Water/water-glycol mixture as per VDI 2035/ÖNORM (Austrian standard) 5195
Weight
Total weight net
approx. 4.72 kg
Total weight gross
approx. 5.05 kg
Connections to pipe network
1” male thread primary (heat generator)
1” fl. secondary (heat distribution)
Isomix
1”, flat sealing
Materials
Fittings
Brass CW617 N--nickel plated
Seals and O-rings
AFM34/2 and EPDM
Plastics
Impact resistant and temperature resistant
Circulation pump, actuator and other
electrical components
Technical data can be found in the enclosed technical documentation.
Kvs value
3.2 m³/h
Differential pressure
max. 500 mbar

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3 Safety
3.1 Presentation of safety information
DANGER indicates an imminent danger
that may cause serious physical injury
or death if the appropriate safety
precautions are not in place.
WARNING indicates a danger arising
through incorrect behavior (e.g. misuse,
disregarding notices, etc.) that may
cause serious physical injury or death.
CAUTION indicates a potentially
dangerous situation that may cause
minor or slight injuries if the appropriate
safety precautions are not in place.
NOTE indicates a situation that
may cause material damage if the
corresponding precautions are not taken.
3.2 Important safety information
• Before using the Isomix, read this operating manual
through carefully.
• Connect the Isomix only to a power source that
corresponds to the mains voltage specified on the rating
plate of the Isomix.
• The power supply to the Isomix must be disconnected
prior to maintenance, cleaning and repair work.
• Maintenance, cleaning and repair work may be carried out
by trained specialist personnel only.
• The Isomix must not be used if it is damaged or is no
longer operating correctly. In this case, contact your
specialist dealer immediately.
• Observe the maintenance instructions and intervals.
• Protect the Isomix from the weather.
• Never use the Isomix outdoors.
• The unit may be used only in accordance with its intended
use.
3.3 Intended use
The Isomix-HC distributor control station is used for load-
based control of the flow temperature in surface heating/
cooling systems.
The flow temperature is controlled by the integrated
HEATING/COOLING controller in accordance with the
external temperature by means of a selectable heating/
cooling curve.
The steepness of the curve can be selected in accordance
with the conditions at the location (further details can be
found in the operating manual for the controller).
The Isomix-HC can be used to operate a heating system that
is set to the individual requirements of a home or of individual
living rooms or commercial areas.
The integrated CC-HC climate controller has 7-day
programming with 9 standard programs set in the factory
and 4 user programs that you can select yourself.
As an option, a room thermostat can be connected to the
CC-HC climate controller. Suitable room thermostats are
available in our range of accessories in cabled or wireless
versions. With these, operation of the heating system can be
optimized to the usage behavior of a reference room.
The control station is intended for direct fitting to the right or
left of round pipe heating manifolds with 1” male thread and
an axis dimension of 210 mm.
It comes with union nuts with a 1” G thread for this purpose.
The control station is intended for use in dry rooms in
residential or commercial areas.
It is usually installed in the heating room or in a distribution
cabinet.
The Isomix is not intended to be operated by people
(including children) with limited physical, sensory or mental
capacities, or by people with insufficient experience or
previous knowledge.
3.4 Foreseeable misuse
The following is considered to be foreseeable misuse:
• Operating the Isomix beyond its specifications.
• Improper use of the Isomix.
• Modifications to the Isomix that have not been agreed with
the manufacturer.
• Use of replacement or wear parts that have not been
approved by the manufacturer.
• Operating the Isomix outdoors.

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3.5 Responsibilities of the plant operator
The plant operator must ensure that:
• the Isomix is used only for its intended purpose
• the Isomix is installed, operated and maintained according
to the specifications of the installation and operating
manual
• the Isomix is operated only in accordance with local
regulations and occupational health and safety regulations
• all precautionary measures have been taken to avoid
dangers originating from the Isomix
• all precautions for first aid and firefighting have been taken
• only authorized and trained users have access to the
Isomix and operate it
• users have access to this installation and operating manual
at all times
3.6 Personnel groups
Only qualified persons may install and operate the Isomix
and carry out maintenance work.
Operators
Operators are deemed to be qualified if they have read these
operating instructions and understood the potential hazards
associated with improper behavior.
Fitters/commissioning engineers
Fitters/commissioning engineers are in a position to carry out
work on the Isomix, taking into consideration the applicable
standards, provisions, regulations and laws and their
technical training and technical knowledge, and can detect
and prevent potential hazards.
3.7 Information on the operating environment
Limescale deposits (from hard water), corrosion and
chemical and physical reactions can damage the control
station.
The system planner is responsible for evaluating these
parameters and developing remedies.
4 Structure
1 2
6
4
3
7
10
9
11
12
8
5
1Primary supply (1” male thread)
2Primary return (1” male thread)
3Surface heating/cooling supply (1” union nut)
4Surface heating/cooling return (1” union nut)
53-point actuator
6Temperature limiter (optional)
7Circulation pump
83-way mixer valve with non-return valve
9Eccentric screw connection for supply temperature
sensor
10 Climatic controller CC-HC
11 External temperature sensor
12 Flow temperature sensor

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5 Function
The set value for the flow temperature, determined by the
heating controller using the current external temperature
and the heating curve, is monitored continuously by the flow
sensor. If there are temperature fluctuations, the controller
causes the 3-point actuator to open or close the valve, or to
maintain the valve position when the set value is reached.
The hot water fed in from the primary circuit via the valve
is mixed directly with the water from the underfloor heating
return. The mixed medium is distributed by the pump to the
heating circuit manifold and from there to the connected
heating circuits.
The underfloor heating flow temperature can be seen on the
heating controller.
There is a non-return valve between the primary feed and the
return connection on the mixer valve, which prevents a short-
circuit in the primary circuit.
6 Installation and commissioning
Electrical energy!
Risk of death from electric shock.
• Work on parts carrying live voltage must
be carried out by qualified electricians
only.
• Disconnect the power supply of the
system and secure it to prevent it from
being switched on again before carrying
out any installation, maintenance, cleaning
or repair work.
The installation and commissioning of
the Isomix must be carried out only
by trained personnel who have been
authorized by the manufacturer.
When repairing the unit or replacing
parts, be sure to observe the specified
installation positions and flow directions
of the parts being replaced!
Material damage!
Pressure shocks may occur if the stop
valve is opened or closed quickly.
• Always open and close the stop valves
slowly and in a controlled way.

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6.1 Installation
Optional:
Pump 1
Mixer circuit
Power supply
230VAC 50 Hz
External temperature
sensor (cable)
Optional: Return
temperature sensor
Supply temperature
sensor
3-point
drive
Red
Blue
White
CLOSE
OPEN
System diagram of heating elements and surface heating/cooling system
Separate heating and cooling generator
Separate risers
System diagram of heating elements and surface heating system
One heat generator
Shared riser
System diagram of surface heating/cooling system
Separate heating and cooling generator
System diagram of surface heating/cooling system
Reversible heat pump
Isomix-HCIsomix-HC
Isomix-HCIsomix-HC

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1Heat generator
2Primary circulation pump boiler/heating circuit
3Primary supply circuit
4Primary return circuit
5Heating element / radiator
6Underfloor heating/cooling supply
7Underfloor heating/cooling return
8Heating/cooling circuit manifold
9Flushing, filling and emptying unit
10 3-way mixer valve with 3-point drive
11 Underfloor heating/cooling circulation pump
12 Temperature limiter (optional)
13 Underfloor heating/cooling supply temperature sensor
14 Return temperature sensor
15 HEATING/COOLING controller
16 External temperature sensor
17 Room temperature and humidity sensor (optional)
18 Non-return valve
19 Shut-off device (recommended)
20 Cooling unit/cold water unit
21 Switch/zone valve
22 Reversible heat pump (heating/cooling)
23 Hydraulic separator
Hot water!
Risk of severe scalding.
Do not reach into the hot water when
emptying the Isomix.
Ensure that the Isomix has cooled
down before carrying out maintenance,
cleaning and repair work.
Install a suitable scalding protection
device at every tapping point (safety
shut-off valve, for example, or thermostat
mixer tap).
More detailed information on scalding
protection can be found in DIN 1988,
sheet 2, section 4.2.
During installation it must be ensured that the cables
from the pump and temperature limiter are not kinked.
The cables must not be under tension.
1. Fit the control station to the manifold with the 1” nuts and
associated seals.
The control station can be fitted on the right or left of
the manifold by turning the eccentric screw fitting.
2. Fit the temperature limiter to the supply collector pipe on
the manifold.
3. Connect the control station to the power supply.
Further information about electrical connection of
the control station can be found in the separate
documentation for the assemblies.
To ensure that the pump runs only
when heat is required, the manufacturer
recommends connecting the pump to
a pump relay (e.g. the pump logic of an
electrical control distributor that also
controls the actuators).
Alternatively, the pump can be operated
with a timer switch.
4. Set the temperature on the (optional) temperature limiter
to approx. 55 °C.
In the event of a fault, the temperature limiter
switches off the circulation pump and so avoids
overheating of the surface heating system.
5. Optional:
If all heating circuits are fitted with actuators and no
pump relay is used, the temperature limiter must be fitted
to the supply of the heating circuit manifold.

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6.2 Initial commissioning
All screw fittings must be checked and tightened if
necessary prior to installation and commissioning!
Torque:
• ¾” screw fittings 35 Nm
• 1” screw fittings 55 Nm
• 11/2” screw fittings 130 Nm
1. Connect the control station to the pipe network.
2. Shut off the ball valves (using ball valves (15) supplied
with the heating circuit manifold or shut-off device fitted
by the customer).
3. Switch off the pump and close all of the heating circuits
on the distributor.
It is sufficient to close the valves in the return
collector of the heating circuit manifold with the
protection caps.
4. Fill the manifold and control station with hot water (in
accordance with VDI 2035):
5. connect the filling hose to the fill and drain valve on the
return (5-9b) and the draining hose to the fill and drain
valve on the supply (5-9a).
Heating circuits are closed.
6. Open both fill and drain valves and fill the manifold and
control station until water comes out of the fill and drain
valve on the supply.
7. Close both fill and drain valves.
8. To fill and flush the heating circuits, connect the filling
hose to the supply fill and drain valve (6-9a) and the
emptying hose to the return fill and drain valve (6-9b).
9. Open the heating circuit to be flushed.
10. Open fill and drain valve and flush out the heating circuit
in the direction of flow until the air and any contamination
has been removed from the circuit completely.
The non-return valve (14) in the mixer bypass prevents
any short circuit when flushing.
11. Repeat the process for all the heating circuits.
Flushing is permitted only in the direction
of flow of the heating circuits, i.e. the
water must enter through the flow
manifold and come out of the return!
The drain must always be open, as
otherwise the high water pressure could
damage the heating system.
The instructions on flushing in the
operating manual for the heating circuit
manifold must also be observed.

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6.3 Use in combination with
Watts Heat Interface Unit HIU 2
For use in combination with the HIU 2 Heat Interface Unit,
the Isomix-HC must be converted (overhead) and the
eccentric rotated.
1. Release nut (A).
A
2. Rotate eccentric (B).
C
B
BEccentric
CPosition of the contact thermostat

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7 Pressure loss curve
Pressure loss Isomix oor control unit
Pressure loss [mbar]
Flow rate [L/h]

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8 Maintenance
Electrical energy!
Perform maintenance work on the Isomix
only when the power supply has been
disconnected.
Hot water!
Risk of severe scalding.
Do not reach into the hot water when
emptying the Isomix.
Ensure that the Isomix has cooled
down before carrying out maintenance,
cleaning and repair work.
Hot surfaces!
Risk of serious burns.
Do not touch the pipes or components
during operation.
Ensure that the Isomix has cooled
down before carrying out maintenance,
cleaning and repair work.
Wear heat-resistant safety gloves if it
is necessary to carry out work on hot
components.
Maintenance of the Isomix-HC must be
carried out only by trained personnel
who have been authorized by the
manufacturer.
8.1 Annual maintenance
1. General visual inspection
• Check the control station for leaks and retighten sealing
connections or replace seals, as required.
2. Functional check
• Check that settings and operating and performance
parameters are set correctly.
• Check flow noise during operation.
• Ask users if there are any noticeable problems.
3. Action to be taken following maintenance work
• Check that all screw fittings that were unscrewed have
been retightened and retighten if necessary.
• Remove all tools, materials and other equipment used from
the working area.
• Restore the power supply.
• Slowly pressurize the Isomix and vent it.
• Readjust the system settings if required.
8.2 Replacement of wear parts
Please note that the Isomix contains parts that, for technical
reasons, are subject to wear depending on the intensity of
use, even if the specified care and maintenance has been
provided.
This applies especially to mechanical parts and parts that
come into contact with water and steam, such as hoses,
seals, valves, etc.
By their nature, defects caused by wear do not constitute a
fault and are therefore not covered by the warranty or any
guarantee. Nevertheless, these defects and malfunctions
must be remedied by trained specialist personnel only.
Contact your specialist dealer for this.

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9 Troubleshooting
Fault
Possible cause Remedy
1Underfloor heating circuits do not heat up; pump not running
1.1 Temperature limiter (TL) is switching the control station
pump off.
Reason: TL setting is too low.
Set TL to approx. 10 K higher than the underfloor heating
flow temperature.
Note the maximum permitted temperature for the
underfloor heating!
The switching difference of the TL is approx. 5 K.
The control station is ready to operate more quickly if
the TL is removed briefly to cool down to its switching
temperature.
1.2 TL is switching the control station pump off.
Reason: The pump remains switched on despite closed
underfloor heating circuits. The water inside the control
station is being heated by waste heat from the pump. The
TL switches the pump off when the maximum temperature
is reached!
Remove TL from the control station and fit to supply heating
circuit manifold.
Use electrical control distributor with pump logic (relay). The
pump logic ensures that the pump runs only if at least one
underfloor heating circuit is open.
1.3 The pump is connected to a room thermostat or electrical
control distributor.
If all actuators are closed, the pump switches off. During a
lengthy shutdown, the underfloor heating flow cools down.
The controller therefore causes the 3-way mixer valve
to open. Hot water is injected from the primary heating
circuit. As a result, the control station heats up. When the
maximum temperature of the TL is reached, the contact
opens. The pump does not switch on again.
Remove TL from the control station and fit to supply heating
circuit manifold.
See 1.1
2Underfloor heating flow temperature cannot be set to the required value or the feed temperature fluctuates
significantly
2.1 Supply and return on the control station have been mixed
up Check that all connections on the control station are correct (see Section “Structure” on page 5)
2.2 The head / pumping level of the pump is set too low Change the pump setting (see separate pump instruction
manual).
2.3 The differential pressure of the primary pump is too high
(>500mbar) Change the pump setting (see separate pump instruction manual) or fit differential pressure controller.
2.4 The heating load is too high for the control station, i.e. heat
consumption exceeds the nominal output of the control
station. This condition can come about temporarily, for
example, when heating up a “cold” floor.
Establish maximum heat requirement and compare with
nominal output. The heating circuits may have to be shared
with a second control station with a corresponding heating
circuit distributor.
If this is caused by heating up the underfloor heating for the
first time, it may start working normally after the heating up
phase (2 – 3 days). This is particularly likely in the case of
operation at the upper nominal output limit.

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10 Spare parts list
Spare part Art. no.:
WTC-IS temperature limiter
internal setting
10013410
Yonos PARA 15/6 pump
1” male thread, L = 130mm
Wilo
10080331
UPM3 Auto L15-70 pump
1” male thread, L = 130mm
Grundfos
10080353
Isomix-HC eccentric
1” fl. x 1” fl.
10080536
Isomix-F / HC thermal
mixer valve
2x1” male thread x 2x1” fl.
10080537
Isomix-HC bracket
1” male thread x 1”fl.
10080540
Climatic control regulator
CC-HC
10021172
Actuator
3-point 230 V
10027254
11 Disposal
Potential for contamination of the
environment and groundwater from
improper disposal!
The legal regulations and guidelines
in the country of operation must be
observed when disposing of components
and operating materials.
1. Ensure that all assemblies and components are
de-energized.
2. Disassemble the Isomix properly or commission a
specialist company to do so.
3. Sort the assemblies and component parts into recyclable
materials, hazardous substances and operating materials.
4. Dispose of the assemblies and components in
accordance with local laws and regulations or take them
to be recycled.
11.1Return to the manufacturer
Get in contact with the manufacturer if you would like to
return the Isomix or parts of it.
11.2 Notication of administrative bodies and
the manufacturer
Inform the manufacturer of decommissioning and disposal of
the Isomix for statistical purposes.
12 Warranty
WATTS products are tested extensively. WATTS therefore
guarantees only to replace or repair components of the
products supplied free of charge – at the sole discretion of
WATTS – if, in the opinion of WATTS, they exhibit verifiable
manufacturing faults. Warranty claims due to defects
or defects of title may be asserted within one (1) year of
delivery/transfer of risk. Excluded from the warranty is
damage attributable to normal product use or friction and
to damage resulting from modifications or unauthorized
repairs to the products, for which WATTS rejects all claims
for compensation (direct or indirect). (For more detailed
information, please refer to our website.) In all cases, supply
is subject to the General Terms and Conditions,
which can be found on www.wattswater.de.