eta Fresh water module 33 User manual

2019-11-22
EN
0000000131
V.016
X.35.11, X.47.0
93994-004
Fresh water module
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 CE-Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Technical data "Fresh water module 33" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Technical data "Fresh water module 44" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Information for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Select installation site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Connecting piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Circulation set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 CAN bus installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Circuit board EM-C4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Information on cold water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.2 Calcification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.3 Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.4 Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9 Descaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10 ETAtouch controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1 Up to software version X.35.X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1.1 [Fresh water module] 2 pumps function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1.2 Setting a time window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.2 Software version X.36.0 and later . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10.2.1 [Fresh water module] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
10.2.2 Setting a time window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.3 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

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General information General
1 General
1.1 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 changes
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 available optionally. 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 with this safety instruction, there is
a risk of material damage.
WARNING!
On non-compliance with this 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.
1.2 Warranty, guarantee and liability
Installation in a dry, frost-proof room
A dry, frost-proof room is required for the installation.
Heed the drinking water ordinance
In terms of drinking water, the chemical, physical and
bacterial limits stated in the applicable national
drinking water ordinance must not be exceeded. See
chapter on 8 "Information on cold water".
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. You can find
more information in the chapter on 8 "Information on
cold water".
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.

General Warranty, guarantee and liability
5
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 common standardised
parts such as electrical fuses or fastening materials, as
long as they possess the required features and do not
restrict the functionality 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
2 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 "Fresh water module 33"
7
3 Description
3.1 Technical data "Fresh water
module 33"
Fig. 3-1: 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) and drain cock to empty the hot water
circulation line
12 Circuit board [EM-C]
Fig. 3-2: 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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Technical data "Fresh water module 44" Description
3.2 Technical data "Fresh water module 44
"
Fig. 3-3: Components
1 Bleed screw
2 Return temperature sensor for hot water circuit
3 1" 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 1" return connection to buffer
9 1" cold water connection
10 1" hot water connection
11 Optional circulation pump with safety valve
(10 bar) and drain cock to empty the hot water
circulation line
12 Circuit board [EM-C]
Fig. 3-4: Dimensions
Technical data
Tap output
44 litres/minute with 45°C hot water at a buffer
temperature of 60°C
Pressure loss (drinking water side)
20 litres/minute = 160 mbar (1,6 mws)
44 litres/minute = 560 mbar (5,6 mws)
Connections (drinking water side)
DN25 (1") internal thread; according to DIN
DVGW or ÖNORM B5014-4
Connections (hot water side)
DN25 (1") 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

Description Function
9
3.3 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:
The fresh water module is in operation and delivers
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.

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Function Description
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.
Fig. 3-5: Function of the fresh water module
1 Connections for the boiler water circuit (primary
side)
2 Connections for cold water (secondary side)
The cold water that simultaneously flows through the
plate heat exchanger on the secondary side absorbs
this heat and exits the fresh water module as hot water.
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 hot water is
being drawn off, the admixing pump reverse pumps a
proportion of the heating water that has cooled down in
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. 3-6: 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.

Description Information for installation
11
Hydraulic connection of the fresh water module
The schematic representation also contains the
optionally available circulation set. 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.
Fig. 3-7: Hydraulic connection
Required software version
The configuration of the fresh water module "33"
requires the software version X.35.7 or X.41.0 or
higher. An update must be performed first if a lower
version is installed.
The fresh water module "44" requires the
software version X.46.0 or higher. A configuration
with the previous software interface (up to X.35.X) is
therefore not possible. But the fresh water module
works independently, even without a CAN-bus
connection to the ETAtouch control.
3.4 Information for installation
Hydraulically uncoupling the fresh water module,
only installing a solenoid valve in exceptional
cases
Ideally, separate piping must run between the fresh
water module and the buffer and this should not be
integrated 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 boiler 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]. The ouput of the
buffer pump from the fresh water module must then be
duplicated, i.e. additionally assigned to the terminal
[S102 LZ] on the circuit board [EM-C]. This
assignment is only possible for systems with an
ETAtouch control panel.
Take the line resistance of the hot water installa-
tion into account.
The "WILO - Yonos Para-Z" pump installed in the
optional circulation set is dimensioned so that in con-
ventional installations a sufficient flow rate is achieved
(see pump curve).
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 installation must be checked during in-
stallation. If required, the operating mode of the
circulation pump can be adjusted (see Fig. 7-2:
"Factory pump settings").
Practical example:
At 0.24 m³/h feed capacity (4 l/min), an installation with
a new aluminium interconnector (16 x 2.2 mm, 20 m
length, 6 fittings) has a line resistance of approx.
1.60 mWs. This roughly corresponds to the pump
characteristic of the circulation pump at the "constant
speed" setting, just below Stage II (see characteristic
curve Fig. 7-3: ""Constant speed" characteristic
curve"). In this setting, the pump needs approximately
18 W of power.
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 ...)

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Information for installation Description
• Check the pipe dimensions, lengths and number of
fittings and calculate the line resistance.

Installation Preparation
13
4 Installation
Technical Illustrations
The technical illustrations show the assembly of the
"fresh water module 33". These graphics apply equally
to other available fresh water modules from ETA.
Assembly and installation only by qualified
specialist personnel
The assembly and installation may be performed
by specialist personnel with the corresponding
qualifications only.
4.1 Preparation
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.
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.
Removing the plastic cover
Prior to starting installation, remove the plastic cover
by loosening the screw on the bottom side.
Hydraulic connection on the buffer
Ideally, the fresh water module is laterally connected to
the buffer. Since this ensures optimal ventilation of the
buffer on its buffer cap.
Fig. 4-1: preferred connection variant
If a lateral connection is not possible, the fresh water
module can be connected to the buffer cap. But then
the flow line must have an incline to the fresh water
module. The T-piece for the bleed valve must be the
same size as the connection on the buffer, so that no
air pocket may form.
Fig. 4-2: alternative connection variant

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Select installation site Installation
4.2 Select installation site
Mounting the fresh water module on the wall
The position for two screws on the top and bottom side
each must be transferred to the wall. Mount the
four screws in the wall, hang the fresh water module
on these and fasten in place.
Fig. 4-3: Mounting holes for wall installation
The fresh water module weighs approximately
20 kg.
Mounting the fresh water module on the buffer
For mounting the fresh water module on the buffer, a
bracket with clamping jaws for 6/4" nipples is optionally
available.
Fig. 4-4: optional bracket with clamping jaws
Reseal the 6/4" nipple and mount in a buffer
connection that is not in use. Mount the clamping jaws
at the required height in the bracket. Push the bracket
with the clamping jaws onto the nipple and fasten
using the two screws.
Fig. 4-5: Bracket with clamping jaws

Installation Connecting piping
15
Hang the fresh water module on the 4 screws present
on the bracket and fasten.
Fig. 4-6: Fastening the fresh water module in place
4.3 Connecting piping
Leave the joint at the fresh water module "44"
For the fresh water module "44", the joint is
already included in the delivery scope of the fresh
water module. Keep this in fresh water module so that
it is available if later a circulation set is retrofitted.
Fig. 4-7: Joint
Mounting the screw joints
At the top, mount the ball valve on the flow connection
using the supplied flat seal.
Fig. 4-8: 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.
Fig. 4-9: Check valve on return connection
Note the flow direction of the check valve. This
must flow from the fresh water module to the
buffer.

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Connecting piping Installation
For cold water, mount both ball valves with purging
connections using the supplied flat seals.
Fig. 4-10: Cold water connections
Produce piping for the fresh water module
The preferred lateral connection of the fresh water
module to the buffer is shown in the following.
Establish the flow line from the buffer to the fresh water
module.
Fig. 4-11: Flow line to the fresh water module
If a lateral connection is not possible, the fresh
water module can also be connected to the buffer
cap. But then the flow line must have an incline to the
fresh water module. See the following graphic.
Fig. 4-12: alternative connection
Mount the return line from the fresh water module to
the buffer.
Fig. 4-13: Return line to the buffer

Installation Connecting piping
17
Install bleed valve
A bleed valve with sufficient dimensions must be
installed at the highest point.
Fig. 4-14: Bleed valve
If the fresh water module was connected to the buffer
cap, the T-piece for the bleed valve must be the same
size as the connection on the buffer, so that no air
pockets may form.
Fig. 4-15: 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.
Connecting the cold water pipe
Connect the cold water pipe to the fresh water module.
Fig. 4-16: Cold water connections
If the water installation is designed with rigid
pipes and narrow diameters (such as 15 mm CU
or 1/2" galvanised, for example), 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 drinking 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.

18 www.eta.co.at
Circulation set Installation
4.4 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. 4-17: Optional circulation set
1 18 mm joint (DN15)
2 Safety valve (10 bar)
3 Circulation pump
4 Drain cock to bleed the hot water circulation line
5 Joint with 1" outer thread
For the fresh water module "44", the joint is
already included in the delivery scope of the fresh
water module. Keep this in fresh water module so that
it is available if later a circulation set is retrofitted.
Fig. 4-18: Joint
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. 4-19: Mounting the joint

Installation Circulation set
19
To attach the joint, push the bracket into the recess on
the housing.
Fig. 4-20: 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. 4-21: Safety valve
Position the outlet of the safety valve so that no
leaking water can drip onto the pump. Therefore,
guide the outlet with a pipe to the ground or drainage
system (e.g. sewer). A freely visible, open flow path
(e.g. siphon funnel) during the procedure allows a
visual check to determine whether the safety valve is
dripping.
Dripping safety valve due to pressure surges and
thermal expansion
When running a hot water circulation, the water is
heated in a closed system and expands. The check
valve in the cold water inlet prevents water expansion
in the cold water pipe. The safety valve prevents
excessive pressure in the system and thus protects the
fresh water module or installation. This is why it is
possible that the safety valve opens a little and begins
to drip. Similar to a pressure-free under-counter
storage tank or a hot water tank.
If the water installation is designed with rigid pipes and
narrow diameters (such as 15 mm CU or 1/
2" galvanised, for example), then pressure surges 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 drinking water) in order to
absorb the pressure shocks in the hot water pipe. This
expansion tank also avoids a leaking safety valve.
The pressure expansion vessel for the hot water
pipe must comply with the country-specific
hygiene standards.
Connecting the hot water pipe
Connect the hot water pipe for the circulation.
Fig. 4-22: Connecting the hot water pipe
Do not use thermally regulated pumps for hot
water circulation
If the ETA circulation set is not used but instead
an external circulation set is installed, you may
not use thermally regulated pumps. Because this will
switch off when the return gets too warm, then the
"self-learning" function (often called "Auto Loop") will
not work properly for the fresh water module.

20 www.eta.co.at
Configuration
5 Configuration
Content 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 "Configu-
ration" manual supplied with the boiler.
Required software version
The configuration of the fresh water module "33"
requires the software version X.35.7 or X.41.0 or
higher. An update must be performed first if a lower
version is installed.
The fresh water module "44" requires the
software version X.46.0 or higher. A configuration
with the previous software interface (up to X.35.X) is
therefore not possible. But the fresh water module
works independently, even without a CAN-bus
connection to the ETAtouch control.
Starting the configuration assistant
The process of starting the configuration assistant
differs depending on the installed software version.
Software version X.35.X and earlier
• Increase the authorisation to [Service]. Then open
the [Toolbox] menu by pressing the button and
the [Configure system] button.
Software version X.36.0 and later
• In the system settings , increase the authori-
zation to [Service] and open the system configura-
tion menu with the [Systems configuration] button.
Start the configuration assistant with the
[Starting the assistant] button.
Description for software version X.36.0 and later
The following description and screen shots represent
the software interface of version X.36.0 and later.
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
heating circuits, for example). 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. 5-1: 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: .