eta FWM-E User manual

2016-06-22
EN
0000000131
V.009
X.36.0
22010-02
93994-001 Fresh water module
with 2 energy-saving pumps
Operating Instructions

ETA Heiztechnik
Gewerbepark 1
A-4716 Hofkirchen an der Trattnach
Tel: [phone] / 22 88 -0
Fax: [phone] / 22 88 -22
[email protected]
www.eta.co.at

3
Contents
1 General information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 CE-Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3 Information for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Circulation set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.1 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 CAN bus installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.3 Circuit board EM-C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9 Information on cold water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.1 Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.2 Lime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.3 Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9.4 Aggressive cold water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10 Descaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11 ETAtouch controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11.1 Getting to know the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11.1.1 Setting a time window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11.2 [Fresh water module] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.2.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11.2.2 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4 www.eta.co.at
General information
1 General information
Copyright
All contents of this document are property of ETA
Heiztechnik GmbH and are protected by copyright.
Any reproduction, transfer to third parties or use for
other purposes is prohibited without written permission
from the owner.
Subject to technical alterations
We reserve the right to make technical modifications
without notice. Printing and typesetting errors or
changes of any kind made in the interim are not cause
for claims. Individual configurations depicted or
described here are only optionally available. In the
event of contradictions between individual documents
regarding delivery scope, the information in our current
price list applies.
Software Description
The software version described in this documentation
corresponds to the version valid at the time of publica-
tion. The software version installed on your product
may differ from that described in this documentation.
A software update to a more recent version can
always be performed. With the appropriate au-
thorisation, the required files can be found at
"www.eta.co.at".
Explanation of symbols
Instructions and information
Layout of safety instructions
SIGNAL WORD!
Type and source of danger
Possible effects
• Measures for avoiding the danger
Types of safety instruction
CAUTION!
On non-compliance withthis safety instruction, there is
a risk of material damage.
WARNING!
On non-compliance withthis safety instruction, there is
a risk of physical injury.
DANGER!
On non-compliance with this safety instruction, there is
a risk of major physical injury.

Warranty, guarantee and liability
5
2 Warranty, guarantee and liability
Installation in a dry, frost-proof room
A dry, frost-proof room is required for the installation.
Observe the drinking water ordinance
In terms of the cold water, the chemical, physical and
bacterial limits stated in the applicable national
drinking water ordinance must not be exceeded.
See 9.1 "Quality"for more information.
Calcification
Potential calcification of the fresh water module is
excluded by the warranty. In the case of water with par-
ticularly high scale-forming properties, water softening
or regular descaling may be necessary.
Safety valve for the drinking water line
Before each closed drinking water heater (=TWE /
tank) a membrane safety valve is to be installed in
accordance with DIN 1988 and 4753, Part 1 and
TRD 721. This valves opens automatically when a set
operating pressure is exceeded (6, 8, 10 bar), and
after a pressure reduction it closes again automatical-
ly.
Except flow heaters with a nominal volume of less than
3 litres.
The ETA fresh water module falls under this
exception rule. That is why no additional safety
valve is required.
With the optional circulation set, however, a
safety valve is required on the drinking water side
(10 bar) and that is why it is already installed at the
factory. This must not be blocked nor removed.
pH value between 8 and 9
The pH value of water used to fill the heating system
must be between 8 and 9.
Expanding the control system
Only components provided by us may be used for
expanding the control system, unless these are
generally available standard devices, such as thermo-
stats.
Proper installation
The installing contractor is liable for proper installation
according to the corresponding installation instructions
and the relevant rules and safety regulations. If you as
customer have installed the heating system partly or
entirely without relevant training and in particular
without up-to-date practical experience, without having
the installation checked by a trained and responsible
expert, we exclude defects in our delivery and conse-
quential damages resulting from this cause from our
warranty, guarantee and liability.
Repairs
Repairs are only permitted using spare parts provided
by us. The only exceptions are commonly available
standard parts such as electrical fuses or fastening
materials, provided such parts have the necessary
features and do not compromise the safety of the
system.
Repair of defects
For repairs of defects carried out by the customer or by
a third party, ETA shall only bear the costs or remain
obligated by warranty if this work was approved in
writing in advance by the customer service of ETA
Heiztechnik GmbH.

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CE-Conformity
3 CE-Conformity
ETA Heiztechnik GmbH
A-4716 Hofkirchen an der Trattnach, Gewerbepark 1
www.eta.co.at
Declaration of conformity
Product: Fresh water module with energy-saving pumps
Types: ETA FWM-E
EU Directives:
2004/108/EC Directive relating to electromagnetic compatibility (EMC Directive)
2006/95/EC Directive relating to electrical equipment designed for use within certain voltage limits
(low-voltage Directive)
2011/65/EU Directive on the restriction of the use of certain hazardous substances in electrical and
electronic equipment (RoHS 2 Directive)
Applied Standards:
EN 60335-1:2012 Household and similar electrical appliances - Safety
Part 1: General requirements
IEC 61000-6 1/2:2005 Electromagnetic compatibility (EMC):
Generic standards - Immunity for residential, commercial and light-industrial environ-
ments (1) and industrial environments (2)
IEC 61000-6 3/4:2007
+ A1:2011 Electromagnetic compatibility (EMC): Generic standards - Emission standard for residential, commercial and light-industrial
environments (3) and industrial environments (4)
We hereby declare that the product in its standard design as stated here corresponds to the above provisions.
Hofkirchen, 16/05/2014 Ing. Johann Eibelhuber
Quality Assurance DI Ferdinand Tischler Management

Description Technical data
7
4 Description
4.1 Technical data
Connections and components
1 Bleed screw
2 Return temperature sensor for hot water circuit
3 3/4" flow connector from buffer
4 Admixing pump as calcification protection
5 Flow temperature sensor for hot water circuit
6 Buffer pump for hot water circuit
7 Flow sensor with temperature sensor for hot water
8 3/4" return connection to buffer
9 3/4" cold water connection
10 3/4" hot water connection
11 Optional circulation pump with safety valve
(10 bar)
12 Circuit board [EM-C2]
Dimensions
Technical data
Tap output
33 litres/minute with 45 °C hot water at a buffer
temperature of 60 °C.
Pressure loss (drinking water side)
15 litres/minute = 150 mbar (1,5 mws)
33 litres/minute = 580 mbar (5,8 mws)
Connections (drinking water side)
DN20 (3/4") internal thread; according to DIN
DVGW or ÖNORM B5014-4
Connections (hot water side)
DN20 (3/4") internal thread
Purging connections
DN15 (1/2")
Pumps
Two speed-regulated highly efficient pumps for
hot water preparation and calcification
protection (admixing pump)
Standards
Corresponds to DIN DVGW or ÖNORM B5014-
4

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Function Description
4.2 Function
Potentiometer and operating display
The temperature of the hot water can be set with the
potentiometer on the under side, from 40°C to 60°C.
The LED that is attached next to it shows the current
operating condition as well as any faults regardless of
the light colour and the flashing frequency.
The potentiometer is only active if the fresh water
module is operated without the ETAtouch
controller.
1 LED for operating display
2 Potentiometer to set the hot water temperature
Operating displays of the LEDs
•Flashing GREEN (1x per second):
The fresh water module is in preparation.
•GREEN lights:
Thefreshwatermodule is inoperationanddelivers
hot water.
•Flashing YELLOW (1x per second):
The fresh water module is ready, but in emergency
mode without admixing pump.
•YELLOW lights:
The fresh water module is in emergency mode and
delivers hot water.
Fault displays of the LEDs
•Flashing RED (1x every 4 seconds):
The temperature sensor for the hot water is
defective.
•Flashing RED (2x every 4 seconds):
The temperature sensor for the hot water flow is
defective.
•Flashing RED (3x every 4 seconds):
The temperature sensor for the hot water return is
defective.
•Flashing RED (4x every 4 seconds):
The potentiometer for manual setting of the hot
water temperature is defective.
•Flashing RED (5x every 4 seconds):
Automatic venting by the admixing pump does not
work. There may be air in the primary circuit of the
fresh water module. Or the admixing pump,
cabling or the outlet on the circuit board is
defective.
If emergency mode is activated, it still attempts to
produce hot water.
To remedy, vent the fresh water module or activate
the function [Automatic venting].
•Flashing RED (6x every 4 seconds):
The hot water is not heated. The buffer may be
cold or the lines are blocked. Also check the func-
tionality of the buffer pump. If it is defective, you
can try to produce hot water by replacing the
admixing pump and activating emergency mode.
The fresh water module works autonomously.
The basic functions of the fresh water module are
already configured at the factory, also without CAN-
Bus connection to boiler. In this way, the fresh water
module can be put into operation immediately as soon
as the buffer delivers heat. Power is supplied via a
230 V earthed socket.
The temperature of the hot water can be set with the
potentiometer on the under side, from 40 °C to 60 °C.
The LED that is attached next to it shows the current
operating condition as well as any faults.
Even if the fresh water module works autono-
mously, a CAN-Bus connection to the ETAtouch
controller is recommended. This enables multiple
settings for the hot water and any faults are reported
back.
How the fresh water module works
If hot water is drawn off, the flow sensor starts up the
buffer pump of the fresh water module. The hot heating
water is directed through the primary side of the plate
heat exchanger, heating it up.

Description Function
9
The cold water that simultaneously flows through the
plate heat exchanger on the secondary side absorbs
thisheatandexitsthefreshwatermoduleashotwater.
Fig. 4-1: Function of the fresh water module
1 Connections for the boiler water circuit (primary
side)
2 Connections for cold water (secondary side)
The design of the fresh water module protects it
against calcification
In principle, all parts that bear hot water are at risk of
calcification, particularly in the context of hard,
calcareous water and temperatures above 60°C.
However, the decisive advantage of the fresh water
module compared with a hot water tank is its very fast
flow, which leaves almost no time for the lime to build
up in the plate heat exchanger. In the same way, the
lime build up has little opportunity to form as it is
purged from the plate heat exchanger as a result of the
high flow speeds.
In order to protect the plate heat exchanger
against calcification, a second pump called an
admixing pump is also installed. Whilst the hotwater is
being drawn off, the admixing pump reverse pumps a
proportion of the heating water that has cooled downin
the plate heat exchanger and mixes this with the hot
heating water from the buffer. As a result of this, the
critical calcification temperature of 60°C is not reached
and lime buildup is prevented.
Fig. 4-2: Admixing of heating water
If a hot water temperature above 55°C is set, it is
no longer assured that the heating water can be
mixed to a temperature below 60°C. This can result in
individual ducts of the plate heat exchanger no longer
having any protection against calcification.
The hot side of the plate heat exchanger is arranged at
the bottom. As hot water rises and cool water sinks, the
water is mixed in the plate heat exchanger at the end
of each hot water draw-off. This ensures that the plate
heat exchanger will cool down to below the critical
temperature of 60°C during the standby phases.

10 www.eta.co.at
Information for installation Description
4.3 Information for installation
Hydraulically uncoupling the fresh water module
or installing a solenoid valve
Run separate piping between the fresh water module
and the buffer, and do not install in the flow between
the heat producer and the buffer.
However, if this is not possible, then a solenoid
valve (230 V, Kv value > 7) must be installed in
the boiler water return line of the fresh water module.
This opens only if hot water is required and prevents
the plate heat exchanger from being heated up unin-
tentionally by the buffer pump (the pump from the heat
producer to the buffer).
The solenoid valve is connected to the circuit board
[EM-C] at the terminal [S102 LZ] and must be
assigned manually.
Take the line resistance of the hot water installa-
tion into account.
The "Wilo-Star Z Nova" pump installed in the optional
circulation set is dimensioned so that for common in-
stallations a feed capacity of approx 2 - 2.5 l/min is
achieved (= ~150 l/h or 0.15 m³/h respectively).
The flow sensor of the fresh water module is
dimensioned for a flow rate of 2 - 40 l/min. But if
less than 1 l/min hot water is used, it could be that the
flow sensor is not responding and thus the circulation
is not starting.
For this reason, the line resistance of the hot water in-
stallation must be checked during installation. Using
the pump characteristic curve a transport capacity of
0.15 m³/h yields a transport height of approx
0.60 mWs (=60 mBar).
Fig. 4-3: Pump characteristic curve
Examples from practise:
At 0.15 m³/h feed capacity, an installation with a new
aluminium interconnector (16 x 2.2 mm, 20 m length,
6 fittings) has a line resistance of approx. 0.65 mWs.
This roughly corresponds to the transport height of the
circulation pump and thus fits.
The same result also applies for a comparable new
stainless steel line. For an existing galvanised 1/2"
steel line a distance of 30 m is not a problem, even for
a high degree of contamination.
A longer distance would be problematic (>10 m) with a
PEX pipe 12 x 1.5 mm due to the smaller cross-
section and the resulting higher line resistance.
If the circulation does not work, check the following
points:
• Were the pipelines purged?
• Is circulation even possible? (blocked lines,
crushing, pressed in protective cap ...)
• Check the pipe dimensions, lengths and number of
fittings and calculate the line resistance.

Installation
11
5 Installation
Select installation site of the fresh water module
The fresh water module can be attached to a wall or
directly on the buffer storage tank.
If installing on a wall, the fresh water module should be
mounted in the vicinity of the buffer (maximum 5 m
simple line length) to limit pressure losses.
For installation on the buffer, an optional
pipework set is available from ETA. The room
height must be at least the buffer height plus 100 mm
for the installation of the pipework and the ventilation
valve.
Fig. 5-1: Optional pipework set
1 3/4" flow line from buffer to fresh water module
including ventilation valve
2 Bracket with 6/4" nipple
3 3/4" return line from fresh water module to buffer
The length of the CAN-Bus line supplied for
connection to the boiler is 10 m. The
3 temperature sensors for the buffer can be connected
to the circuit board [EM-C] of the fresh water module.
If buffer and heating consumer are located at the
same level
If all consumers of the heating system are located at
the same level or lower than the buffer, the fresh water
module should be connected to the highest side
coupling on the buffer and not above on the buffer cap.
In this case the pipework set can be left out.
Because as soon as air penetrates the heating
system, it collects at the highest point of the
system. In this case in the buffer cap. If the fresh water
module is connected there, there is a danger that air
penetrates the fresh water module and disrupts the hot
water production. That is why the fresh water module
should be connected to the side of the buffer in this
case.
Removing the plastic cover
Prior to starting installation, remove the plastic cover
by loosening the screw on the bottom side.

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Installation
Mounting the fresh water module on the wall
Find a suitable location for wall assembly. The
fresh water module weighs approximately 20 kg.
The position for 2 screws on the top and bottom side
must be transferred to the wall.
Fig. 5-2: Mounting holes for wall installation
Mount the 4 screws in the wall, hang the fresh water
module on these and fasten in place.
Mounting the fresh water module on the buffer
This section describes installation on the buffer
using the optional ETA piping set.
Reseal the 6/4" nipple and mount in a buffer
connection that is not in use. Push the bracket with the
clamping jaws ontothe nipple and fasten using the two
screws.
Fig. 5-3: Bracket with clamping jaws
Hang the fresh water module on the 4 screws present
on the bracket and fasten.
Fig. 5-4: Fastening the fresh water module in place

Installation
13
Mounting the screw joints
At the top, mount the ball valve on the flow connection
using the supplied flat seal.
Fig. 5-5: Ball valve on flow connection
Mount the check valve and the ball valve on the return
connection to the buffer. Use flat seals with all screw
joints.
Note the flow direction of the check valve. This
must flow from the fresh water module to the
buffer.
Fig. 5-6: Check valve on return connection
For cold water, mount both ball valves with purging
connections using the supplied flat seals.
Fig. 5-7: Cold water connections
Produce piping to fresh water module
Mount the flow line on the buffer. Adjust the length of
the lines to connect to the fresh water module and re-
connect the lines with the press sleeves.
A press tool is needed to press the sleeves:
• M crimping jaws (Mapress, Chibro, Filtube,
Gibaco, X-Press) or
• V crimping jaws (Viega, Comap, Effebi, BQ-Press,
Frabo, IBP) or
• SA crimping jaws (Sanha, Cimpress, Giacomini)

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Installation
Add the flat seals to the screw connections.
Fig. 5-8: Adjust the length of both flow lines
If there is sufficient space above the buffer, better
ventilation is provided when the ventilation is
installed on the buffer cap. But then the flow line must
have a slight incline to the fresh water module.
Fig. 5-9: Ventilation on the buffer cap
Mount the return line on the buffer. Adjust the line
lengths to connect the fresh water module and re-
connect them with the press sleeve.
Fig. 5-10: Adjust the length of the return line
Installing a bleed valve in the flow to the fresh
water module
A bleed valve with sufficient dimensions must be
installed at the highest point of the flow line from the
buffer to the fresh water module.
A bleed valve is already installed in the ETA
piping set.
Fig. 5-11: Bleed valve
Installing the dirt filter upstream of the fresh water
module
At least one dirt filter must be installed upstream
of the fresh water module in the cold water
system.

Installation Circulation set
15
Connecting the cold water pipe
Connectthecold waterpipe tothe freshwatermodule.
Fig. 5-12: Cold water connections
If the water installation is designed with rigid
pipes and narrow diameters (such as 15 mm CU
or 1/2" galvanised), then pressure shocks are to be
expected. In order to protect all components against
pressure shocks, we recommend fitting a small
diaphragm pressure expansion vessel (for example,
8 litre version suitable for cold water) in order to absorb
the pressure shocks in the hot water pipe. The
respective national hygiene standards must be
observed in the process.
Establish a CAN-Bus connection to the boiler
Establish a CAN-Bus connection between the boiler
and the fresh water module with the CAN-Bus line
supplied.
The fresh water module can also be put into
operation without a CAN-Bus connection. The
temperature of the hot water can be set with the poten-
tiometer on the under side, from 40 °C to 60 °C. Nev-
ertheless, a CAN-Bus connection to the ETATouch
controller is recommended, as this enables multiple
settings for the hot water and any faults are reported
back.
5.1 Circulation set
Optional circulation set for the hot water
A circulation set for the hot water can optionally
be installed on the fresh water module.
Fig. 5-13: Optional circulation set
1 18 mm joint (DN15)
2 Safety valve (10 bar)
3 Circulation pump
4 Joint with 1" outer thread
Mounting the circulation set
Insert the circulation set at the fresh water module and
mount the joint at the connection using the supplied flat
seal.
Fig. 5-14: Mounting the joint

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Circulation set Installation
To attach the joint, push the bracket into the recess on
the housing.
Fig. 5-15: Attaching the joint
Running piping to the safety valve
A safety valve with 10 bar opening pressure has
already been installed on the circulation set at the
factory.
Fig. 5-16: Safety valve
DANGER!
Safety valve outlet
The safety valve outlet must be directed to the ground
in a pipe so nobody is endangered by hot water or
steam.
The safety valve outlet must be directed to the
sewer via a clearly visible, open route (siphon
funnel), so that malfunctions, especially a failure of
the safety valve to close, can be detected. If no
sewer connection is available, the outlet must be
directed to the ground in a pipe.
Connecting the hot water pipe
Mount the hot water pipefor the circulation at the pump
connection.
Fig. 5-17: Connecting the hot water pipe
If the water installation is designed with rigid
pipes and narrow diameters (such as 15 mm CU
or 1/2" galvanised), then pressure shocks are to be
expected. In order to protect all components against
pressure shocks, we recommend fitting a small
diaphragm pressure expansion vessel (for example,
8 litre version suitable for cold water) in order to absorb
the pressure shocks in the hot water pipe. The
respective national hygiene standards must be
observed in the process.
Installing drain cock to bleed the circulation line
So that the air can escape from the circulation
line we recommend installing an on-site flushing
facility, or a drain cock in the circulation line. It should
be in the direction of flow before the circulation pump.
Don´t use thermal controlled pumps for the hot
water circulation
If an external circulation set is installed instead of
the ETA set, don´t use thermal controlled pumps.
Because they will stop if the return is getting warm,
than the function "Auto Loop" will not work.

Configuration
17
6 Configuration
Topic of this configuration
Only the steps required for the configuration of this
product are described below.
The configuration of the complete heating system is
described in the "Configuration" manual supplied with
the boiler.
Software version X.28.0 or later
Software version X.28.0 or later must be installed on
the boiler in order to perform configuration.
If an earlier software version is installed, an update is
required.
Starting the configuration assistant
In the system settings, increase the authorization
to [Service], and open the system configuration menu
with the [Systems configuration] button.
Fig. 6-1: System configuration menu
Start the configuration assistant with the [Assistant
start] button.
Function block [FWM 2pumps] is already installed
To control the fresh water module using energy-saving
pumps, the circuit board [EM-C] features the separate
[FWM 2pumps] function block; this is already installed
at the factory.
For monitoring purposes, check whether this is
shown in the [Selected function blocks] column
for the circuit board [EM-C 0] in the function blocks
overview.
Adjusting options in function block [FWM 2pumps]
The circulation pump is already configured at the
factory (=option [Circulation pump]) as well as the hot
water temperature settings via the potentiometer only
(=option [Target value can be set with rotary knob]).
If, however, no circulation pump is installed or the
hot water temperature should be set with the
ETATouch controller, these options must be deactivat-
ed.
This is done by selecting the fresh water module
function block from the [Selected function blocks]
column:
Open options. Deactivate the respective option in the
window that opens:
Press the [Accept] button to save.
Adding fresh water module as consumer
The fresh water module is connected to the buffer
as an additional consumer (together with the
heatingcircuits, forexample). A separate connection is
not required.
If there is not yet any connection between the buffer
and the heating circuit, a new connection must be set
up. For this purpose, press the [New connection]
button and select the [Heating water] connection type.
Connect the fresh water module (as a consumer) to
the buffer (as a producer). See below for an example
with a heating circuit and the fresh water module:
Tab. 6-1: Example with heating circuit and fresh water
module
If there is already a connection between the
buffer and the heating circuits, the fresh water
module must only be added to this connection as an
additional consumer.
Selected function blocks
EM-C 0
FWM 2pumps
Circulation pump
Target value can be set with rotary knob
Connections
Heating water
Producers
GM-C 0: Buffer: HC/HWT
Consumers
EM-C 0: FWM: .
GM-C 0: HC: .

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Configuration
Assigning a terminal for the optional solenoid
valve
This step is only necessary if the fresh water
module is installed in the flow between the heat
producer and the buffer, meaning that a solenoid valve
is required. The solenoid valve is connected to the
circuit board [EM-C] at the terminal [S102 LZ] and
must be assigned manually.
Assigning terminal
1. In the [Selected function blocks] field, first select
the function block of the fresh water module [FWM
(FWM 2pumps)].
2. Double tap at the buffer pump [Buffer pump]. A
window opens.
3. Select in the lower window the terminal [S102 LZ]
at the board [EM-C] and add it with [Connect].
4. Close the window using the [Close] button.
Installing a configuration
Finish by pressing [Apply] to install the configuration.
The configuration will then be adopted and the
software restarted.

Electrical connections Requirements
19
7 Electrical connections
7.1 Requirements
Electrical connection must only be made by
qualified specialist personnel
The electrical installation must only be performed
by specialist personnel with the corresponding
qualifications.
Power supply of the module
Power is supplied to the module via the power
plug that has already been mounted; this is
performed independent of the boiler. However, the
power supply can also be securely wired to the
electronic distributor.
DANGER!
Electric shock
There are live parts on the circuit boards. If
touched, they can cause injury and
property damage.
Before beginning any work, isolate the system
completely from all power sources, ensure that it
cannot be switched back on, and verify that it is
safely isolated from supply.
CAUTION!
Flexible stranded conductors
If flexible stranded conductors are not used for the
wiring, the contacts in the plug connections will be
subjected to excessive mechanical strain. In this case,
the warranty for the electronics would become null and
void.
Only flexible stranded conductors may be used for
the wiring.
7.2 CAN bus installation
Establishing a CAN bus connection
To establish the CAN-Bus connection to the boiler,
there a 2 terminals and the associated line in the
delivery scope.
Allocation of CAN-Bus terminal
Only clamp the "Sch" shield on one side. Do not
connect the "+" and "Gnd" wires.
Example: connection to circuit board [GM-C]
A terminal resistor (yellow jumper) must be set at
the end of the CAN-bus . If both CAN-Bus
terminals are allocated, the terminal resistor must be
removed on this circuit board.
In the example listed above, the terminal resistor must
be removed from the circuit board [GM-C] at [X4] and
set on circuit board [EM-C] at [X1].

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Circuit board EM-C2 Electrical connections
7.3 Circuit board EM-C2
Terminal Function Default assignment
CAN Node CAN bus node switch Position "0"
F1 Fuse T 3,15 A (Mains power input)
S100 Supply 230 V Mains power input
S101 230 V output Buffer pump and admixing pump
S102 LA 230 V output Circulation pump (optional)
S102 LZ 230 V output
Optional solenoid valve.
Required if the fresh water module is installed in
the flow between the heat producer and the
buffer. This terminal must be assigned manually in the
control.
S103 230 V input Free
S600 T1 Temperature input Primary flow
S600 T2 Temperature input Primary return
S600 T3 Temperature input Free (can be used for buffer)
S600 T4 Temperature input Free (can be used for buffer)
S600 T5 Temperature input Potentiometer for the hot water temperature
S600 T6 Temperature input Hot water
S601 RS-485 bus
S602 PWM output Speed control for buffer pump
S603 PWM output Speed control for admixing pump
S604 24 V input Flow sensor with temperature sensor
S605A CAN-bus From boiler
S605B CAN-bus Free
X1 CAN bus terminator resistor
X2 RS-485 terminator resistor
X3 Boot jumper
Terminals marked with this symbol are not pre-wired.