enphase Vaillant aroTherm plus VWL 105/6 A 230V S2 Manual

INSTALLATION AND CONFIGURATION MANUAL (PRELIMINARY)
© 2023 Enphase Energy Inc. All rights reserved. February 2023
SG Ready installation and configuration:
Vaillant aroTherm plus heat pump system
Table of contents
Safety................................................................................................................................................................................2
Read this first ..................................................................................................................................................2
Safety instructions.........................................................................................................................................2
Corporate headquarters contact information ..........................................................................................3
Environmental protection.............................................................................................................................3
Other information ..........................................................................................................................................3
Audience .........................................................................................................................................................3
Preface .............................................................................................................................................................................4
Scope of this document................................................................................................................................4
Compatible heat pumps with this document.............................................................................................4
Optimization of the heat pump using the SG Ready interface................................................................................4
Performing the prerequisite checks............................................................................................................................4
Hardware requirements ................................................................................................................................4
Connecting the heat pump and the SG Ready Relay ...............................................................................................5
Connection to Vaillant VWZ MEH 97/6 indoor unit...................................................................................5
Connection to Vaillant VWZ AI controller..................................................................................................8
Configuring the heat pump system controller.........................................................................................................10
Configuration of Vaillant multiMATIC 700 system controller ...............................................................10
Configuration of Vaillant sensoCOMFORT 720 system controller ........................................................ 11
Commissioning the Enphase Energy System........................................................................................................... 13
Appendix ........................................................................................................................................................................ 14
References..................................................................................................................................................................... 14
Revision History............................................................................................................................................................. 15

Vaillant heat pump system configuration
2 © 2023 Enphase Energy Inc. All rights reserved. March 2023
Safety
Read this first
Follow the instructions in this manual. These instructions are key to the installation and maintenance of the SG
Ready Relay. To ensure the safe installation and operation of the SG Ready Relay, note the following safety
symbols that appear throughout this document to indicate dangerous conditions and important safety
instructions.
DANGER:
This indicates a hazardous situation, which if not avoided, will result in
death or serious injury.
WARNING:
This indicates a situation where failure to follow instructions may be a
safety hazard or cause equipment malfunction. Use extreme caution and
follow instructions carefully.
NOTE:
This indicates information that is very important for optimal system
operation. Follow instructions closely.
Safety instructions
DANGER:
Risk of electrocution!
Do not attempt to repair the SG Ready Relay. It contains no user-
serviceable parts. Tampering with or dismantling the SG Ready Relay will
void the warranty. If the equipment fails, contact Enphase Customer
Support (enphase.com/support) for assistance or replacement
equipment.
DANGER : Risk
of electric shock
Do not use SG Ready Relay in a manner not specified by the manufacturer.
Doing so may cause death or injury to persons, or damage to equipment.
All sources to equipment being serviced must be disconnected external to
the device. In particular, the storage system may energize conductors, so
storage circuit
s must ALWAYS be isolated via circuit breaker or
disconnected before working on any portion of the system.
Be aware that installation of this equipment includes risk of electric shock.
DANGER : Risk
of electric shock. Risk of
fire.
Only use
electrical system components approved for wet locations.
Only qualified personnel should troubleshoot, install, or add parts to the SG
Ready Relay
.
Ensure that all wiring is correct and that none of the wires are pinched or
damaged.
Do not work alone. S
omeone should be in the range of your voice or close
enough to come to your aid when you work with or near electrical
equipment. Remove rings, bracelets, necklaces, watches etc. when working
with batteries, photovoltaic modules, or other electrical equipment.

Vaillant heat pump system configuration
3 © 2023 Enphase Energy Inc. All rights reserved. March 2023
WARNING:
Before installing or using the
SG Ready Relay , read all instructions and
cautionary markings in the technical description and on the components.
NOTES:
Using unapproved attachments or accessories could
result in damage or
injury.
Perform all electrical installations in accordance with all national and local
electrical codes.
Corporate headquarters contact information
Enphase Energy Inc.
47281 Bayside Pkwy,
Fremont, CA 94538
enphase.com
enphase.com/support
Environmental protection
Waste electrical products should not be disposed of with household waste. Please recycle where facilities
exist. Check your Local Authority or retailer for recycling advice.
Other information
Product information is subject to change without notice. All trademarks are recognised as the property of their
respective owners.
User documentation is updated frequently; Check the Enphase website (enphase.com/support) for the latest
information.
Enphase did not author and does not take any responsibility for the functionality or accuracy of information
for third party content linked in this document.
Copyright © 2023 Enphase Energy Inc. All rights reserved.
Audience
This manual is intended for use by professional installation and maintenance personnel.

Vaillant heat pump system configuration
4 © 2023 Enphase Energy Inc. All rights reserved. March 2023
Preface
Scope of this document
This document provides the necessary information to configure and setup the supported heat pump for use
with the IQ Energy Router+ and the Enphase Energy System (EES).
For further information regarding the installation of the IQ Energy Router+ package, please review the Quick
Install Guide available in the Enphase documentation center.
This document has been developed after obtaining permission from Vaillant. Observe the safety instructions
from Vaillant with respect to installation, operation, and maintenance from the heat pump and its equipment
which you can find in References at the end of this document. The information from Vaillant might change and
hence, when in doubt, contact Vaillant.
Compatible heat pumps with this document
Heat pump Controller/indoor unit
aroTherm plus VWL 105/6 A 230V S2 VWZ MEH 97/6; VWZ AI; multiMATIC 700;
sensoCOMFORT 720
aroTherm plus VWL 125/6 A S2 VWZ MEH 97/6; VWZ AI; multiMATIC 700;
sensoCOMFORT 720
Optimization of the heat pump using the SG Ready interface
Connect the Enphase IQ Energy Router to a supported heat pump using the SG Ready interface. Once
configured, the IQ Energy Router can optimize the operation of the heat pump to increase the self-
consumption of solar energy and lower the use of energy from the public electricity grid.
NOTE:The SG Ready signal is purely a recommendation to start the heat pump. The Enphase IQ
Energy Router can never force the heat pump system to turn ON or OFF. The comfort level of the user
is always safeguarded, and the correct operation of the heat pump system is ensured.
Performing the prerequisite checks
Perform the following prerequisite checks before proceeding with the wiring and configuration of the heat
pump equipment and SG Ready Relay:
•Follow the Enphase Energy System installation and commissioning instructions in the Enphase
Installer App.
•Activate the Enphase IQ Energy Router and configure it such that it can detect and connect to the
other components such as SG Ready Relay or Energy Meter referred to in this documentation.
Hardware requirements
Install the following hardware before you proceed with this document.
•Enphase hardware
oIQ Gateway
oIQ Battery
oIQ Microinverters

Vaillant heat pump system configuration
5 © 2023 Enphase Energy Inc. All rights reserved. March 2023
•Enphase Energy System hardware (hard copy guides provided in the box)
oIQ Energy Router
oEnergy Meter
oSG Ready Relay
•Heat pump system
oSupported Vaillant heat pump system
NOTE: Install and connect the SG Ready Relay and Energy Meter to the same LAN of the customer.
Connecting the heat pump and the SG Ready Relay
Danger:Electric shock. Do not touch live components as it can lead to dangerous injuries due to
electrical current. Disconnect the whole system before working on it with a separate fuse or via the
main fuse, check that no voltage is present afterwards and secure against switching on again. There
is risk that some components still carry voltage after the main voltage has been switched off.
To set up the SG Ready Relay functionality, connect the SG Ready Relay to the heat pump indoor unit or to the
controller of the heat pump via cables. The cable connection differs depending on the connection type.
Connection to Vaillant VWZ MEH 97/6 indoor unit
Source: Vaillant

Vaillant heat pump system configuration
6 © 2023 Enphase Energy Inc. All rights reserved. March 2023
1. Remove the screws and the front cover as shown in the following figure to open the VWZ MEH 97/6.
Source: Vaillant
2. The inner components of the indoor unit are visible.
Source: Vaillant

Vaillant heat pump system configuration
7 © 2023 Enphase Energy Inc. All rights reserved. March 2023
3. Reach to the control PCB by opening the control PCB's electronics box. This can be done by hinging
the electronics box forwards and then undoing the four clips on the left and the right and the top from
the brackets.
Source: Vaillant
4. Connect the cables from SG Ready Relay with the EVU contact X106/S21 and with the X41/FB and
X41/OT inputs of the control PCB. The colors of the wires are not important.
Control PCB inputs
SG Ready Relay outputs
X106/S21:3 25
X106/S21:4 26
X41/FB
28
X41/OT
29
Source: Vaillant

Vaillant heat pump system configuration
8 © 2023 Enphase Energy Inc. All rights reserved. March 2023
5. After the wiring is completed, close the PCB's electronics box and the indoor unit by placing the front
cover back on and securing it with the screws.
NOTE: This wiring concept supports SG Ready mode 1, 2 and 3, but does not support SG Ready
mode 4. However, SG Ready mode 4 is not used by the Enphase IQ Energy Router+ anyway.
An overview of the supported operating modes is as follows:
•Mode 1: EVU closed (1), S21 open (0)
•Mode 2: EVU open (0), S21 open (0)
•Mode 3: EVU open (0), S21 closed (1)
•Mode 4: NOT SUPPORTED
Connection to Vaillant VWZ AI controller
Source: Vaillant
1. Remove the screws and the front cover as shown in the figure to open the VWZ AI.
Source: Vaillant

Vaillant heat pump system configuration
9 © 2023 Enphase Energy Inc. All rights reserved. March 2023
2. All the inner components of the control unit are visible.
3. Connect the cables from SG Ready Relay with the EVU input and with the ME input of the VWZ AI. The
colors of the wires are not important.
Control PCB inputs
SG Ready Relay outputs
EVU:1
25
EVU:2
26
ME:1 28
ME:2
29
Source: Vaillant
NOTE: This wiring concept supports SG Ready mode 1, 2, and 3, but does not support SG Ready
mode 4. However, SG Ready mode 4 is not used by the Enphase IQ Energy Router+ anyway.

Vaillant heat pump system configuration
10 © 2023 Enphase Energy Inc. All rights reserved. March 2023
An overview of the supported operating modes is as follows:
•Mode 1: EVU closed (1), ME open (0)
•Mode 2: EVU open (0), ME open (0)
•Mode 3: EVU open (0), ME closed (1).
•Mode 4: NOT SUPPORTED
Power on
After performing all the steps above, you can apply power by closing the breaker for the heat pump, the Energy
Meter, and SG Ready Relay, and then proceed to the configuration step below.
Configuring the heat pump system controller
After the installation is done, the SG Ready function must be activated and configured on the heat pump
system controller.
Depending on the system controller of the heat pump, the activation and configuration of the SG Ready
function can be different.
Configuration of Vaillant multiMATIC 700 system controller
1. Click the “Menu” button.
Source: Vaillant
2. Go to “Installer level”.
3. Click “Select” and enter the access code to access the installer level. The factory programmed code
is “000”.
NOTE: Some menu items are protected by a password code. If the factory programmed code is
not working and the new code is not known, reach out to the responsible heat pump installer.
4. Go to “System configuration” > “System” > “Energy supplier”.
5. Click “Change” and select “HP&BH off”.
6. Click “OK” to confirm.

Vaillant heat pump system configuration
11 © 2023 Enphase Energy Inc. All rights reserved. March 2023
Source: Vaillant
7. Go back to “System configuration” > “Additional module” > “Multi-funct. Input”. Select “PV”.
8. Set the temperature offset to be applied to the buffer cylinder when the SG Ready signal is active. To
set, go to “System configuration” > “System” > “Buff. cyl. offs". Set the offset with which the
temperature should be increased.
9. After you have finished the steps above click “Back” until you reach the main menu.
NOTE:
Please consult the homeowner. As a guidance, the usual settings are +5
K for DHW as
well as heating water buffer cylinder
, and +1.5 K for room temperature.
NOTE:
C
ontact the responsible heat pump installer if you need help with setting the
temperature offsets.
WARNING:
Do not set the domestic hot water temperatures too high as there might be a
risk of discomfort or injury.
Configuration of Vaillant sensoCOMFORT 720 system controller
1. Click the button to reach the “MENU”.
Source: Vaillant

Vaillant heat pump system configuration
12 © 2023 Enphase Energy Inc. All rights reserved. March 2023
2. Go to “Settings” > “Installer level”.
3. Enter the access code to access the installer level. The factory programmed code is “00”.
4. Click the button to confirm.
Note: Some menu items are protected by a password code. If the factory programmed code is
not working and the new code is not known, reach out to the responsible heat pump installer.
5. Go to “Installation configuration” > “Installation” > “ESCO”.
6. Select “HP + BUH off”.
7. Click the button to confirm.
Source: Vaillant
10. Click to go back to “Installation Configuration”.
11. Go to “HP control module configuration” > “MI”. Select “Photovoltaics”.
12. Click the button to confirm.
Source: Vaillant
13. Click to go back to “Installation Configuration”.

Vaillant heat pump system configuration
13 © 2023 Enphase Energy Inc. All rights reserved. March 2023
14. Go to “Installation” > “Buffer cylinder offset” to set the temperature offset for the buffer cylinder when
SG Ready is active.
NOTE: Please consult the homeowner. As a guidance, the usual settings are +5 K for DHW as well as
heating water buffer cylinder, and +1.5 K for room temperature.
NOTE:
C ontact the responsible heat pump installer if you need help with setting the temperature
offsets.
WARNING: Do not set the domestic hot water temperatures too high as there might be a risk of
discomfort or injury
15. Click to go back to the main menu after finishing the above steps.
Commissioning the Enphase Energy System
The last step involves commissioning the EES.
1. Open the Enphase Installer App.
2. Go to the support section of Enphase Installer App where you can find all relevant documentation
needed to commission the EES.
Note: Contact Enphase Customer Support if you experience any issues and need help

Vaillant heat pump system configuration
14 © 2023 Enphase Energy Inc. All rights reserved. March 2023
Appendix
Here is an overview of the SG Ready operating modes.
Operating mode Description
Operating mode (1:0) The heat pump and the electrical auxiliary heater are off.
Operating mode 2 (0:0) Normal operating of the heat pump based on heat pump controller
settings.
Operating mode 3 (0:1) One-
time storage tank charge up is triggered to the setpoint
temperature configured in the multiMATIC 700 / sensoCOMFORT
720. By that, energy is stored in the hot water storage tank. After
that, energy is stored in the buffer tank (if available) by increasing
the temperature to the set point configured in the mutliMATIC 700 /
sensocomfort 720.
For hot water forced charging dominates over time programs.
Storage tank charging is done outside the set time windows. If there
is no heat demand and operating mode 3 is present, no storage tank
charging is done in heating mode.
Operating mode 4 (1:1) Not supported by the wiring concept described in this document.
References
Current installation manuals, product brochures and further information for Vaillant heat pump models and
additional hardware can be obtained on the official website www.vaillant.de. The following are used as
source for setting up this manual:
VWZ MEH 97/6
•“Betriebsanleitung, Installations- und Wartungsanleitung“ (published: 20.07.2022)
https://www.vaillant.ch/downloads/installationsanleitungen/deutsch/waermepumpen/hydrauliksta
tion/installations-und-betriebsanleitung-hydraulikstation-meh-97-6-1841122.pdf
VWZ AI
•“Für den Fachhandwerker, Installationsanleitung VWZ AI VWL X/2 A“ (published: 31.03.2014)
https://www.vaillant.de/documents/download/145808
multiMATIC 700
•“Systemregler multiMATIC 700”
https://www.vaillant.de/heizung/produkte/systemregler-multimatic-700-700f-
62976.html#downloads

Vaillant heat pump system configuration
15 © 2023 Enphase Energy Inc. All rights reserved. March 2023
•“Für den Fachhandwerker, Installationsanleitung multiMATIC 700 VRC 700/4“ (published:
06.10.2018)
https://www.vaillant.ch/downloads/installationsanleitungen/deutsch/regelungstechnik/multimatic
-1/installationsanleitung-multimatic-vrc-700-2123925.pdf
sensoCOMFORT 720
•“Witterungsgeführter Regler sensoCOMFORT”
https://www.vaillant.de/heizung/produkte/witterungsgefuhrter-regler-sensocomfort-179200.html
•“Betriebs- und Installationsanleitung“ (published: 21.02.2019)
https://www.vaillant.de/produkte/sensocomfort/0020272660-00-1505609.pdf
aroTHERM plus and SG Ready
•“Elektrische Absicherungen, Anschluss EVU-Sperre, Anschluss PV/SG Ready” (published: 09.2020)
https://www.vaillant.ch/downloads/installationsanleitungen/deutsch/waermepumpen/elektrische-
anschluesse/installationsanleitung-elektrische-anschluesse-arotherm-plus-1727522.pdf
Revision History
Revision
Date
Description
Rev 1
March 2023
Initial revision