eta Fresh water module 33 Operating Instructions Manual

Tel: +43 (0) 7734 / 22 88 -0 Fax: +43 (0) 7734 / 22 88 -22 [email protected] www.eta.co.at

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

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.

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.

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

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

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

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.

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.

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 ...)

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

"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

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

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.

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

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.

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

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.

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: .

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.

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. 6.2 CAN bus installation Establishing a CAN bus connection To establish the CAN-Bus connection to the boiler, there a two terminals and the associated cable in the delivery scope. Fig. 6-1: CAN-bus cable 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].

23 Check the node numbers if the circuit boards are the same design If multiple circuit boards of the same design (e.g.: two [EM-C]) are connected to one another via CAN-bus, those circuit boards must have different and consecutive node numbers. In this way they are recognized in CAN-bus and can be configured. Therefore, compare the node numbers of the individual circuit boards of the same design and set them as needed using the node switch.

Electrical connections 6.3 Circuit board EM-C4 Terminals marked with the symbol are not factory pre-wired. Terminal Function Default assignment CAN Node CAN-Bus node switch Position "7" for fresh water module "33" Position "9" for fresh water module "44" 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 Motor ball valve for cascade systems (if there are several fresh water modules) From factory, this output is intended for motor ball valves of cascade systems in order to activate the subsequent fresh water module (also referred to as "Slave" module). This output can also be used for a solenoid valve in order to turn off the heater side of the fresh water module in case this is not connected hydraulically decoupled. See chapter 3.4 "Information for installa- tion". S103 230 V input On the factory side, the contacts "NC" and "COM" are connected (bridged), because otherwise all 230 V outputs are locked. 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

25 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 terminal resistor X2 RS-485 terminal resistor X3 Boot jumper Terminal Function Default assignment

Due to vibration and thermal expansion, all screw joints must be inspected and tightened prior to commissioning. Bleeding before commissioning The fresh water module must be ventilated before commissioning. For ventilation, there is a ventilation screw on the top of the fresh water module. Fig. 7-1: Bleed screw The option [Automatic venting] has been enabled at the factory. In this way, the controller recognises the introduction of air into the heat exchanger and tries to remove it with the help of both pumps. This can also take place multiple times one after the other. If, however, the water is still not sufficiently warm, there is still air in the plate heat exchanger and manual venting is needed. To do this, carry out the following steps. Venting the fresh water module 1. Open the hot water tap in the drinking water network so that the fresh water module pumps start. 2. After about 15 seconds, close the hot water tap again. 3. Open the vent screw in the fresh water module and allow the air to escape. 4. Then open the hot water tap once more and carry out the steps again. Carry on doing this until no more air escapes from the fresh water module. Mounting the plastic cover Reattach the plastic cover following commissioning. Pull off the protective film and affix the ETA logo in the corresponding recess. Adjusting the speed of the circulation pump By default, the circulation pump is set to "Constant Speed" in the "III" position. If required, the operating mode "differential pressure variable (Δp-v)" (left scale on the rotary knob) can also be set. Fig. 7-2: Factory pump settings Using the current flow rate (readable in the text menu of the ETAtouch control) and the pump curve (see pump characteristics), the speed of the circulation pump can be adapted to the customer's requirements. We recommend adjusting the pump so that a flow rate of approximately 4 l/min is achieved. A minimum flow of 2 l/min must be guaranteed for the flow sensor to trigger. Thermal valves for the circulation line are actually not required, because the circulation pump shuts down in time by means of the return sensor. If there are several strands available for the circulation line and thermal valves are installed in these, at least one strand must always remain open (the longest strand, if possible) so that circulation can occur.

Fig. 7-4: "Differential pressure variable (Δp-v)" characteristic curve Adjusting the runtime of the circulation pump After installation, and after all lines have been connected and vented, the runtime of the circulation pump must be adjusted. Thus unnecessarily long run times of the circulation pump can be prevented and the risk of calcification of the heat exchanger in the fresh water module is minimized. You can determine the required running time of the circulation pump in the following way. Start the circulation pump in the control system by means of manual operation in the inputs and outputs menu. After starting, measure the time until the fresh water module warms up the return line for the circulation. This time (e.g. 3 minutes) is required to heat the hot water pipe. Then enter this time in parameter [Circulation runtime]. During this time measurement, no hot water may be tapped (e.g. by sink, shower ...), because otherwise an incorrect time is measured. Circulation Circulation runtime

8 Information on cold water 8.1 General Different variants of fresh water modules and heat exchangers In general, there are two major points to consider for drinking water heating via plate heat exchangers: • Calcification: This depends on the water hardness specified in degrees of German hardness (°dH). • Corrosion of the plate heat exchanger: This depends on the water quality, especially the conductance. This is why ETA offers two versions of fresh water modules or replacement heat exchangers. The inexpensive standard solution with stainless steel plates connected by copper solder, as well as the somewhat more expensive special solution with stainless steel plates connected by stainless steel brazing solder ("INOX" heat exchanger). If you have the fresh water module with the "standard heat exchanger" but are not sure whether this can keep up with the demands of your drinking water, then you can operate the fresh water module normally, of course. If the heat exchanger actually develops leaks due to copper corrosion, you can exchange it at any time for the special solution with stainless steel brazing solder. This heat exchanger is also offered individually by ETA. Ask your heating technician We recommend that you take advantage of the heating technician's experience. He or she will know whether you must pre-treat your drinking water and which procedure is best suited to the drinking water in your region. 8.2 Calcification Increasing water hardness increases the risk of calcification Irrespective of the type of drinking water heater, we recommend installing a water softener from a water hardness of 14°dH and above. With our fresh water module, damage caused by calcification is not of great concern since an inexpensive replacement heat exchanger from ETA can be replaced by the heating engineer in a few easy steps. For machines like coffee makers, washing machines, dishwashers ... the damage from calcification is often associated with high costs, or the devices may even become irreparable. Due to the fact that 1 litre of water contains about 18 mg of calcium for each °dH, the risk of calcifi- cation increases with increasing water hardness. One litre of water with 10° dH therefore contains around 180 mg calcium, at 20° dH about 360 mg. The calcification risk also increases when the hot water temperature is set above 55 °C or when circulation pumps are operated for 24 hours (in other words practically all the time). In these cases, the provided protective measures against excessive calci- fication, such as reducing the primary temperature (see functionality of the fresh water module), circulation breaks or its deactivation and optimised connection arrangement of the ETA fresh water module, are unable to cope. The heat exchangers offered by ETA do not exhibit any differences in terms of calcification. They only differ in terms of corrosion resistance. 8.3 Corrosion The electrical conductance is crucial for possible copper corrosion What is important for potential copper corrosion of the solder connections of the individual plates is the electrical conductance. How well water conducts current is determined with the conductance meter. This can only measure how well all conductive minerals in the water conduct together. The conductance of individual materials cannot be determined. So this overall hardness determines the conductance. Basically, water with a lower conductance has a lower overall hardness. Water with higher conductance is correspondingly harder. However, it is not possible to calculate the hardness from the conductance with a precise formula, or vice versa. A rule of thumb is: per °dH the conductance of tap water increases by at least 35 μS/cm. Due to the content of sodium, chloride and sulphate in different tap waters differing widely, the conductance can be pushed up sharply. For example: tap water with an overall hardness of: 17° dH and a conductance of over 700 μS/cm exists. So the rule of thumb can only be applied to a limited extent for tap water. However, it is helpful in making a rough estimation without precise water tests. In general, copper soldered heat exchangers with a conductance of less than 500 μS/cm are very corrosion-resistant. At 500-1000 μS/cm, corrosion

Thresholds 29 cannot be ruled out depending on other water properties. At a conductance of over 1000 μS/cm corrosion is likely. Therefore, the rule of thumb results in the following thresholds for copper-soldered heat exchangers in regard to water hardness: If the water hardness is minimised by a softening system, the electrical conductivity of the drinking water still remains unchanged. 8.4 Thresholds Thresholds for the water quality on the drinking water side Tab. 8-1: Thresholds for drinking water Conductance Water hardness Resistance < 500 μS/cm at approx. <14.3° dH corrosion- resistant 500-1000 μS/cm at approx. 14.3 - 28.6° dH Corrosion is no excluded > 1000 μS/cm approx. >28.6° dH Corrosion is likely Conductance Water hardness Resistance Substance Standard heat exchanger (soldered with copper solder) "INOX" heat exchanger (soldered with stainless steel brazing solder) Appearance clear clear Odour odourless odourless Impurities free from deposits and/or particles free from deposits and/or particles pH value between 7.5 and 8.5 between 6 and 10 electrical conductivity < 500 µS/cm no restriction Chloride (Cl-) < 100 mg/l < 100 mg/l Sulphate (SO4 2-) < 100 mg/l no restriction Nitrate (NO3) < 100 mg/l no restriction Nitrite (NO2) not permitted not permitted Ammonia (NH3, NH4 +) < 2.0 mg/l no restriction Free chlorine (Cl) < 1.0 mg/l < 1.0 mg/l Iron (Fe) < 0.2 mg/l no restriction Aluminium (Al) < 0.2 mg/l no restriction Manganese (Mn) < 0.1 mg/l no restriction Free carbon dioxide (CO2) < 5 mg/l no restriction Hydrogen sulphide (H2S) < 0.05 mg/l no restriction Hydrogen carbonate (HCO3) < 300 mg/l no restriction

If the heat exchanger of the fresh water module is calcified, it can be descaled via the two purging connections with the use of acetic acid or formic acid. Fig. 9-1: Purging connections When descaling using acid, the flow sensor must be removed and replaced with an adapter as it is not acid-proof. Fig. 9-2: Flow sensor Once a plate heat exchanger has been calcified, it will never again provide the same level of performance as a model that is 'as new'. In the event of heavy calcification, we recommend replacing the plate heat exchanger. The fair spare part price offered by ETA means that replacement is often even cheaper than purging or descaling, both of which are labour- intensive. Using acetic acid or formic acid 5 to 12 per cent acetic acid or 10 to 20 per cent formic acid is suitable for descaling purposes. Both acids are available from drugstores. Pay attention to the concen- tration. CAUTION!  Always pour the acid into the water; never pour the water into the acid (this leads to spraying that can cause burns). Use protective gloves and safety goggles. In standard cases, use the medium specified dilution. Dilution using less water poses a risk to the seals. Mixing ratios: • Dilute vinegar essence (25%) with 1 to 4 parts water • Dilute acetic acid concentrate (60%) with 4 to 12 parts water • Dilute formic acid (85%) with 4 to 8 parts water Professional mixtures including phosphoric acid are available for treating particularly stubborn cal- cification. Purge the fresh water module for 1 hour Mix 10 litres of dilution and use a purging pump to purge the solution via a pellet bin for approximately 1 hour. After purging Having purged the heat exchanger, seal the connections once more and reattach the cover.

31 10 ETAtouch controller 10.1 Up to software version X.35.X 10.1.1 [Fresh water module] 2 pumps function block 10.1.1.1 Overview Overview of the fresh water module (2 pumps) You can return to the overview by pressing and [FWM]. 1 Operating condition 2 Temperature [Buffer top] 3 Temperature [Primary return] 4 Display of hot water uptake 5 Temperature [Hot water] 6 Timer [Stand-by times] This only appears if the hot water temperature is not set via the potentiometer (option [Target value can be set with rotary knob] is deactivated). 7 Timer [Circulation times] This only appears if a circulation pump is installed and the [Self-learning] function is deactivated. Function of the fresh water module The desired hot water temperature is set with the po- tentiometer on the fresh water module. If in the config- uration the [Target value can be set with rotary knob] option is deactivated, the timer [Stand-by times] appears in the overview. With this you can set different time windows and hot water temperatures for every day of the week. Inside these time windows, the upper part of the buffer is maintained at no lower than the configured hot water temperature. Outside the set time windows, the hot water is maintained at the lowest set temperature of the 3 time windows, provided that the accumulator tank is sufficiently hot. If an additional circulation pump for hot water is installed, the different operating modes for this pump are set in the same way. See the following description for this. Operating modes for the circulation pump There are two ways to operate the circulation pump. Either through automatic detection of the operating times ("self-learning" function, often referred to as "auto loop") or manual specification of the operating times (set time window). • "Self-learning" function: This is already set at the factory (= parameter [Self- learning] to [Yes]). The hot water tappings of the past 2 weeks are stored for automatic determina- tion of the daily operating times. On the basis of this, the operating times of the current day are calculated and the circulation pump is started in a timely manner. In this operating mode, the circulation pump starts as soon as hot water is drawn (detected by the flow sensor in the fresh water module). The pump will then run for a while and subsequently pause. These runtimes and pauses are configurable (=parameter [Circulation runtime] and [Circulation pause]). After commissioning, no more data is available for the "self-learning" circulation. That is why an operating period of about 4 weeks is required in the beginning, so that the control system can save sufficient data. • Setting a time window: To do this, the "self-learning" function must be switched off (= parameter [Self-learning] to [No]). The operating times of the circulation pump are now set manually, for example from 10:00 am to 2:00 pm . Within these time windows, the circulation pump alternately starts and pauses, based on the set runtimes and pauses, regardless of whether hot water is currently being drawn or not. Example: Time window = 10:00 am to 2:00 pm [Circulation runtime] = 5 minutes [Circulation pause] = 10 minutes => The pump runs from 10:00 am to 10:05 am ,

ETAtouch controller then pauses until 10:15 am , restarts at 10:15 am, pauses from 10:20 am to 10:30 am , and so on ... until the end of the time window at 2:00 pm . In this operating mode, the circulation pump can also start outside of the time window when hot water is being tapped. This is useful if, for example, the time window ends at 8:00 pm and you shower at 9:30 pm . When you then turn on the hot water briefly, the circulation pump starts, and you will have hot water for showering shortly afterwards. This runtime (outside the time window) is set in the text menu (parameter [Circulation pump delay]). Enter the same value as parameter [Circulation runtime]. Heat exchanger The tap symbol next to the heat exchanger is only displayed if the fresh water module is feeding hot water into the water mains. The temperature shown next to this is the temperature of the hot water currently being supplied. If no hot water is being supplied, the heat exchanger is shown blue all the way through. Circulation pump in operation Optional: for [Circulation pump] The pump symbol next to the heat exchanger appears when the circulation pump for hot water is in operation. Timer [Stand-by times] This is only displayed if option [Target value can be set with rotary knob] is deactivated This timer displays the set charging times of the current day for charging the hot water tank. These time windows are displayed as a black bar in the timer. Timer [Circulation times] This only appears if a circulation pump is installed and the [Self-learning] function is deactivated. This timer displays the set times of the current day to operate the circulation pump. These time windows are displayed as a black bar in the timer. 10.1.1.2 Operating modes Ready No hot water is currently being taken. Working Hot water is currently being supplied. Buffer cold Hot water is being supplied, but the buffer is not hot enough to reach the configured hot water temperature. Primary return too warm Hot water is being supplied, but the selected hot water temperature is being reduced because the [Primary return] temperature in the heat exchanger of the fresh water module is too high. Malfunction A temperature sensor in the fresh water module has a defect. Circulation The circulation pump is in operation. Venting The controller has found air in the fresh water module and automatic venting is in operation. For this, both pumps are operated at full speed for a short period of time to remove the air from the fresh water module. This can also take place multiple times sequentially. Emergency operation The fresh water module is in emergency mode because the admixing pump is defective. Currently, hot water is being delivered but it is only being produced with the buffer pump. Without the admixing pump, calcification protection of the heat exchangers it not guaranteed. Protracted emergency mode can therefore calcify the heat exchanger. Ready (Emergency operation) The fresh water module is in emergency mode because the admixing pump is defective. Without the admixing pump, calcification protection of the heat exchangers it not guaranteed. Protracted emergency mode can therefore calcify the heat exchanger. Circulation Circulation pump delay

33 10.1.1.3 Operation Setting charging times and temperatures of the fresh water module With the [Stand-by times] timer, you can set different time windows and hot water temperatures for the fresh water module for each day of the week. Within these time windows, the upper part of the accumulator tank is maintained at no less than the set hot water temperature. Outside the set time windows, the hot water is maintained at the lowest set temperature of the 3 time windows, provided that the accumulator tank is suffi- ciently hot. To set the charging times and temperatures, tap the overview screen on the [Stand-by times] timer. A screen opens. Fig. 10-1: Overview of hot water charging times Set the hot water temperature as low as possible to prevent limescale build-up. You can find further details about setting the time window in chapter 10.1.2 "Setting a time window". Setting circulation times for the circulation pump With the [Circulation times] timer, you can set 3 different time windows for the circulation times of the circulation pump for each day of the week. To set the circulation times, tap the [Circulation times] timer in the overview screen. A screen opens. Fig. 10-2: Overview of circulation times Set the circulation times to be as short as possible to ensure good buffer stratification and prevent limescale build-up. You can find further details about setting the time window in chapter 10.1.2 "Setting a time window".

ETAtouch controller 10.1.2 Setting a time window Setting time window and temperatures The time window is set with the timer for charging the tank (for example for accumulator tank and hot water tank), or the operating times (for example for the heating circuit). 1 Timer to set a time window Setting a time window and the hot water temperature for the hot water tank will be described in the following. This example applies accordingly for all other function blocks with timers. To set the charging times, tap the timer in the overview. An overview opens. Fig. 10-3: Overview Set the individual time windows and temperatures by tapping the lines [Time slot 1:], [Time slot 2:], [Time slot 3:] and [Set-back temperature between time slots:]. A settings window appears after tapping. Fig. 10-4: Settings window Enter the time window and desired temperature and press [Accept] to save. Set the further time windows the same way. Press the [Delete] button to delete a set time window and restore the factory settings. Copying time windows After you have set the time windows, you can copy them for other days of the week. To do this, tap the [Copy] button in the overview screen. Fig. 10-5: Overview

35 A screen opens showing the individual days of the week. Fig. 10-6: Copying time windows Make your selection and press the [Accept] button to save.

ETAtouch controller 10.2 Software version X.36.0 and later 10.2.1 [Fresh water module] function block Fresh water module overview screen 1 Operating condition and information. A description of the operating conditions can be found in the integrated Help menu by pressing the button. 2 Producer for the fresh water module. Currently, the fresh water module is charged by the buffer at a flow temperature of 58 °C. 3 Primary side return temperature 4 Circulation pump (only displayed if it has been installed and is in operation) 5 Hot water temperature (the tap is displayed only when hot water is currently being drawn) 6 [Settings] button. In this menu, the time window can be set, for example. Function of the fresh water module The desired hot water temperature is set with the po- tentiometer on the fresh water module. If in the config- uration the [Target value can be set with rotary knob] option has been disabled, different time windows and hot water temperatures can be set. See chapter on 10.2.1.1 "Setting the hot water charging times". Inside these time windows, the upper part of the buffer is maintained at no lower than the configured hot water temperature. Outside the set time windows, the hot water is maintained at the lowest set temperature of the time windows, provided that the accumulator tank is sufficiently hot. If an additional circulation pump for hot water is installed, the different operating modes for this pump are set in the same way. See the following description for this. Operating modes for the circulation pump There are two ways to operate the circulation pump. Either through automatic detection of the operating times ("self-learning" function, often referred to as "auto loop") or manual specification of the operating times (set time window). • "Self-learning" function: This is already set at the factory (= parameter [Self- learning] to [Yes]). The hot water tappings of the past 2 weeks are stored for automatic determina- tion of the daily operating times. On the basis of this, the operating times of the current day are calculated and the circulation pump is started in a timely manner. In this operating mode, the circulation pump starts as soon as hot water is drawn (detected by the flow sensor in the fresh water module). The pump will then run for a while and subsequently pause. These runtimes and pauses are configurable (=parameter [Circulation runtime] and [Circulation pause]). After commissioning, no more data is available for the "self-learning" circulation. That is why an operating period of about 4 weeks is required in the beginning, so that the control system can save sufficient data. • Setting a time window: To do this, the "self-learning" function must be switched off (= parameter [Self-learning] to [No]). The operating times of the circulation pump are now set manually, for example from 10:00 am to 2:00 pm . Within these time windows, the circulation pump alternately starts and pauses, based on the set runtimes and pauses, regardless of whether hot water is currently being drawn or not. Example: Time window = 10:00 am to 2:00 pm [Circulation runtime] = 5 minutes [Circulation pause] = 10 minutes => The pump runs from 10:00 am to 10:05 am , then pauses until 10:15 am , restarts at 10:15 am, pauses from 10:20 am to 10:30 am , and so on ... until the end of the time window at 2:00 pm . In this operating mode, the circulation pump can also start outside of the time window when hot water is being tapped. This is useful if, for example, the time window ends at 8:00 pm and you shower at 9:30 pm . When you then turn on the hot water briefly, the circulation pump starts, and

37 you will have hot water for showering shortly afterwards. This runtime (outside the time window) is set in the text menu (parameter [Circulation pump delay]). Enter the same value as parameter [Circulation runtime]. 10.2.1.1 Setting the hot water charging times Open the overview screen of the set charging times and temperatures The standby times for the hot water and the set tem- peratures can be adjusted in the settings ( button). To adjust, open the settings and then open the standby times of any given day with the [Stand-by times Daily plan] button. An overview screen opens. Fig. 10-7: Overview 1 Set time windows (standby times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable hot water temperature within the time window 8 Period of the time window 9 Set-back temperature of the hot water outside the time window Setting the time window and copying to other days of the week is described in chapter 10.2.2 "Setting a time window". If a circulation pump is also installed (and the function [Self-learning] is switched off), these operating times are set in the same way (button [Circulation times Daily plan]). Circulation Circulation pump delay

ETAtouch controller 10.2.2 Setting a time window Setting the charging and operation times In some function blocks, the time window for charging the tank (for example the buffer and hot water tank), or the operating times (for example for the heating circuit) are set. This time window must be created in the settings of the respective function block. Subsequently, the setting of the charging times and temperatures will be described in relation to the hot water tank. This example applies accordingly to other function blocks. Open the overview of the time window settings 1. Open the settings for the function block with the [Settings] button. Fig. 10-8: Open the settings 2. Access the charge times of a particular day with the [Charging times Daily plan] button. Fig. 10-9: Access charging times 3. An overview screen opens. Fig. 10-10: Overview 1 Selected time window (charging times or operating times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable target temperature. This is dependent on the function block, and, in this example, corresponds to a hot water temperature of 55 °C. 8 Period of the time window. In this example, the hot water is charged between 08:00 a.m. and 8:00 p.m. to 55 °C. 9 Set-back temperature. Outside the time window, the hot water is charged to this set temperature. Setting the time window is described below.

39 Setting the charging times 1. In the overview, select the charge time. In each field, use the arrow keys ( , ) to set the time and temperature. Fig. 10-11: Setting time slot and temperature In this example, the hot water is charged between 08:00 a.m. and 8:00 p.m. to 55 °C 2. If an additional time window is necessary, add it using the button. Adjust as described above. A maximum of 3 time windows can be set. To delete an unnecessary time window, press the button in the selected time window. 3. For the period outside of the set charging times, a reduced temperature can be set. To adjust the settings, select the [Set-back temperature outside the time window] field and use the arrow keys to select the desired temperature. Fig. 10-12: Reduced operation temperature settings In this example, the desired hot water temperature outside the charging times is 30 °C. When loading times and temperatures of a day of the week have been set, they can be copied to other days of the week. Copying time windows In the following example, the time windows from Wednesday are copied to Saturday and Sunday. Time windows from Wednesday copied to Saturday and Sunday. 1. In the overview, press the [Weekly plan] button to switch to view all days of the week. Fig. 10-13: Copying time windows to days of the week 2. This opens an overview of time windows for all days of the week. First, choose the day of the week to copy (this is framed) and then press the [Copy selected day] button. Fig. 10-14: Overview 3. Now, select the days of the week for which the time window is to be copied. In this example Saturday and Sunday. Fig. 10-15: Select days of the week Pressing the [Mark all days] button marks all days.

ETAtouch controller 4. Press the [Save] button to save. The overview will be updated accordingly. Close the window using the arrow on the left side. You can also access the week overview via the function block settings ( button). For this, press the [Charging times Weekly plan] button in the settings. 10.3 Text menu - Adjustable parameters Adjustable parameters Detailed descriptions of the parameters are provided below. Explanation of [Automatic venting] This function attempts to remove introduced air from the fresh water module automatically. If the function is activated and the controller detects air intake, both pumps are operated at full speed for a short period of time to remove the air from the fresh water module. This can also take place multiple times sequentially. This function is activated by default. During venting, the hot water can briefly be hotter than the target temperature set. Explanation of the [Emergency operation only with buffer pump] function Emergency operation of the fresh water module can be activated with this function if the admixing pump is defective. If it is activated, water heating is only provided by the buffer pump. Without the admixing pump, calcification protection of the heat exchangers is not guaranteed Protracted emergency mode can therefore calcify the heat exchanger. Explanation of the function [Self-learning] With this function, the operating times of the circulation pump of the last 2 weeks are saved. The operating times of the current day are calculated based on this and the circulation pump will be put into operation ac- cordingly. This function is also called the "Auto Loop" function. This function is set to [Yes] by default. If [No] is set, the operating times for the circulation pump can be set manually. Hot water Automatic venting Emergency operation only with buffer pump Circulation Self-learning Circulation runtime Circulation pause Circulation pump delay

41 Explanation [Circulation runtime] Optional: only for circulation pump This parameter specifies the duration for operating the circulation pump after it has been started by the control system. Once this time has expired, the circulation pump is switched off for the set duration [Circulation pause]. Example: [Circulation runtime] = 3 minutes [Circulation pause] = 10 minutes If the circulation pump has been started, it is in operation for 3 minutes and then disabled for 10 minutes. This means that it can only be requested again by the control system after 13 minutes. You can determine the required running time of the circulation pump in the following way. Start the circulation pump in the control system by means of manual operation in the inputs and outputs menu. After starting, measure the time until the fresh water module warms up the return line for the circulation. This time (e.g. 3 minutes) is required to heat the hot water pipe. Then enter this time in parameter [Circulation runtime]. During this time measurement, no hot water may be tapped (e.g. by sink, shower ...), because otherwise an incorrect time is measured. Explanation [Circulation pause] Optional: only for circulation pump This parameter sets the pause after a circulation pump operation. The control system can only restart the circulation pump after this pause/break has expired. Example: [Circulation runtime] = 3 minutes [Circulation pause] = 10 minutes If the circulation pump has been started, it is in operation for 3 minutes and then disabled for 10 minutes. This means that it can only be requested again by the control system after 13 minutes. Explanation [Circulation pump delay] Optional: only for circulation pump If a time is set for this parameter, then the circulation pump also starts outside the time window set. This is useful if, for example, the time window ends at 8:00 pm and you shower at 9:30 pm. When you then turn on the hot water briefly, the circulation pump starts, and you will have hot water for showering shortly afterwards. Enter the same value for this parameter as for parameter [Circulation runtime].

11 Simplified electrical connection (overview)

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