flamco FlexTherm Eco G1 User guide

www.flamcogroup.com/manuals
ENG Installation and operating instruction
FlexTherm Eco G1

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
3
ENG
Content
1. Introduction ................................................................................................................................. 4
1.1 General ..................................................................................................................................................................... 4
1.2 Symbols used ........................................................................................................................................................... 4
1.3 Abbreviations ........................................................................................................................................................... 4
1.4 Responsibillities ....................................................................................................................................................... 4
2. Safety........................................................................................................................................... 6
2.1 Advantages of FlexTherm Eco compact heat storage ................................................................................................. 7
3. Technical specifications ................................................................................................................. 8
3.1 Pressure Loss Characteristic..................................................................................................................................... 9
4. FlexTherm Eco Controller ..........................................................................................................10
4.1 Description ............................................................................................................................................................. 10
4.2 PCB identification ................................................................................................................................................... 10
4.3 Installer settings ..................................................................................................................................................... 11
5. Design of cold and hot water supplies .........................................................................................12
5.1 General requirements ............................................................................................................................................. 12
5.2 Water distribution network design.......................................................................................................................... 12
5.3 Hot water circuit including water safety device ....................................................................................................... 12
5.4 Hard water areas..................................................................................................................................................... 12
6. Installation Guidelines...............................................................................................................13
6.1 General wiring recommendations ........................................................................................................................... 13
6.2 FlexTherm Eco E storage ......................................................................................................................................... 13
6.2.1 Mains cold water and hot water supplies.............................................................................................................. 13
7. Electrical wiring........................................................................................................................14
8. Flextherm Eco + PV Power Diverter.................................................................................................15
8.1 FlexTherm Eco Controller Settings ......................................................................................................................... 15
8.2 Applicability ........................................................................................................................................................... 15
8.3 PV Diverter Configuration ....................................................................................................................................... 15
9. Commissioning .........................................................................................................................17
9.1 General ................................................................................................................................................................... 17
9.2 Pre-commissioning checklist .................................................................................................................................. 17
9.3 Commissioning process .......................................................................................................................................... 17
10. Maintenance.............................................................................................................................19
11. Troubleshooting .......................................................................................................................19
12. Decommissioning & disposal......................................................................................................20
12.1 Decomissinoning .................................................................................................................................................. 20
12.2 Disposal................................................................................................................................................................ 20

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
4
ENG
1. Introduction
1.1 General
The following instructions provide guidance for the installer and user of FlexTherm Eco G1.
The installation must be carried out by a competent installer in accordance with local codes and regulations for
plumbing, electrical installations and potable water supply.
CAUTION
Do not tilt the product more than 45 degrees during the transportation or installation process.
1.2 Symbols used
In these instructions the following symbols are being used to draw the user’s attention to information of
particular importance.
DANGER
lndicates a hazardous situation that, if not avoided, will result in death or serious injury.
WARNING
lndicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
1ndicates a hazardous situation that, if not avoided, could result in minor or moderate injury or material
damage.
Notice: Signals information that is considered important but not hazard related.
1.3 Abbreviations
The following abbreviations are used in the manual,
• BERV – Back-Expansion Relief Valve
• DSR – Demand Side Response
• PCBA – Printed Circuit Board Assembly
• PCM – Phase Change Material
• PRV – Pressure Reducing Valve
• VIP – Vacuum Insulation Panel
1.4 Responsibillities
Manufacturer’s Responsibilities
Our products are manufactured in compliance with the requirements of applicable EU & UK laws and regulations.
More information can be found in the Declaration of Conformity supplied with the Heat Battery.
As an innovative company committed to achieving net zero, Sunamp continuously improves its products, which
means that all specifications and other information stated in this manual are subject to change without prior
notice.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
5
ENG
Our liability as the manufacturer may not be invoked in the following cases:
• Failure to abide by the instructions on using the Heat Battery.
• Faulty or insuicient maintenance of system components protecting the Heat Battery.
• Failure to abide by the instructions on installing the Heat Battery.
Installer’s Responsibilities
The installer is responsible for the installation and the commissioning of the Heat Battery. The installer must:
• Ensure they are suitably qualified for the level of plumbing and electrical work required for the installation of
this Heat Battery.
• Read, understand and follow the instructions given in the manuals provided with the Heat Battery.
• Comply with the prevailing legislation and standards when carrying out the installation.
• Perform the initial start-up and carry out any checks necessary.
• Complete the commissioning procedure and checklist in this manual.
• Explain the installation to the user.
• If maintenance on system components is necessary, warn the user of the requirement to check the system
components to maintain the system in good working order.
• Give all the instruction manuals to the user.
User’s Responsibilities
To achieve optimum operation and longevity of the Heat Battery, the user must adhere to the following
instructions:
• Read and follow the instructions provided in the manuals provided with the Heat Battery.
• Call on qualified professionals to carry out installation, initial start-up and commissioning.
• Ask your installer to explain your installation to you.
• Ensure that system components are maintained as necessary.
• Keep the instruction manuals in good condition and close to the Heat Battery.
CAUTION
Children shall not play with the Heat Battery.
Cleaning and user maintenance shall not be made by children.
Children must be supervised to ensure they do not play with the Heat Battery.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
6
ENG
2. Safety
The FlexTherm Eco range of advanced and compact heat storage uses Phase Change Materials (PCMs) to store heat
for producing hot water. Flamco heat storage can be classified as primary thermal because the hot water is heated
instantaneously on demand by transferring heat from the PCM to the mains water flowing through it.
The pipe connections and the construction of a FlexTherm Eco range of storage are shown in the figure above. The phase
change material (PCM) and the heat exchangers are housed in a sealed enclosure called ‘The Cell’. Although the Cell is
sealed, the pressure inside the Cell is around the ambient atmospheric pressure i.e. about 1.0 bar absolute. The Cell is
insulated using highly eicient vacuum insulation panels. The outer case and hydraulic and electrical connections are
designed so that multiple stores can be connected either in series or parallel.
The FlexTherm Eco range of heat stores have two independent hydraulic circuits for hot water preparation. The heat is
transferred between the PCM and the high power (HPC) and the low power (LPC) hydronic circuits by means of an integrated
heat exchanger inside the Cell.
The heat stores are fitted with temperature sensors for measuring the charge state and for controlling their operation when
connected to the controller. All standard models of the FlexTherm Eco range of heat stores are supplied with PCM58 which
has a phase transition temperature of 58 °C.
The heat stores models covered by this document are listed in table 1.1. This document does not cover sizing, selection,
configuration or design of the heating and hot water system in a building. It only covers installation and commissioning of
the selected compact heat storage for hot water preparation.
Generic range Description Models
FlexTherm Eco E These heat stores are heated by internal electric
heating elements only and therefore these heat
stores are equivalent to Direct vented or unvented
hot water cylinders
FlexTherm Eco 3E, FlexTherm Eco 6E,
FlexTherm Eco 9E
Table 2.1: FlexTherm Eco Range of heat storage

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
7
ENG
2.1 Advantages of FlexTherm Eco compact heat storage
The main benefits of the FlexTherm Eco compact heat storage compared with traditional hot water cylinders and hot water
only thermal stores are:
a. The heat is stored in the Phase Change Material and therefore the water content in the storage is less than 11 Litres and
the hot water is heated instantaneously on demand. Therefore:
• Easy installation because of low expansion volume.
• The risk of legionella build-up inside the store is eliminated, as there is no stagnation and the store is constantly
pasteurised.
b. Quicker and less costly installation.
c. Better insulation and no mandatory annual maintenance or inspections mean lower running costs than comparative
electric storage water heaters.
d. Operational needs: Smaller space, typically 2 – 3 times smaller than the equivalent hot water cylinders and clean
installation.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
8
ENG
3. Technical specifications
Flamco compact heat stores are supplied with PCM58 and an integrated electrical heating element. The discharge
temperature from these standard compact heat storage models can be up to 75°C when fully charged and should therefore
be fitted with a thermostatic blending valve set to 55°C.
The overall dimensions and weights of the compact heat storage models in the FlexTherm Eco range are listed in table 2.1 and
their technical specification is listed in table 2.2. The pressure loss characteristics of the compact heat storage are tabulated in
tables 2.3a, 2.3b, 2.3c.
Table 3.1. Overall dimensions and weights of FlexTherm Eco compact heat storage range
Overall dimensions [mm] Net weight
Width Depth Height [kg]
FlexTherm Eco 3E 365 575 440 70
FlexTherm Eco 6E 365 575 640 125
FlexTherm Eco 9E 365 575 870 175
Table 3.2: Technical specification of FlexTherm Eco heat storage range
Size 3 Size 6 Size 9
Storage capacity –
Standard storage with
PCM58 [1]
[kWh] 3.5 7.0 10.5
Water content – Low
power circuit (LPC)
Water content – High
power circuit (HPC)
[L]
[L]
1.3
2.3
2.4
4.5
3.5
6.8
Equivalent hot water
cylinder size [2] [L] 71 142 212
V40, Volume of hot water
available at 40°C [3] [L] 85 185 300
• Heat loss rate
• Heat loss rate
• ErP Rating class –
Hot water storage vessel
[kWh/24h]
[W]
[ - ]
0.48
20.0
C
0.67
28.1
C
0.77
32.1
C
Recommended
maximum HW flow rate [L/min] 6 15 20
Minimum cold water
supply pressure at inlet
to the heat storage
[bar]
[MPa]
1.50
0.15
1.50
0.15
1.50
0.15
Maximum working
pressure:
High power (HPC) and
Low power (LPC) circuits
[bar]
[MPa]
10.0
1.0
10.0
1.0
10.0
1.0
Hot water outlet
temperature at design
flow rate [4]
[°C] 55 55 55
Heat storage controller
• Electric heater supply
rating at 230V, AC, 50Hz
[5]
• Standby power
consumption – All
models
• Power rating of the
heater at 230V, AC, 50Hz
(‘e’ models only)
[A]
[W]
[W]
16
5
2,800
16
<1
2,800
16
<1
2,800

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
9
ENG
1) Storage operating as hot water heaters. Charged to 75 °C and then discharged using mains cold water at 10 °C until the hot water outlet temperature
dropped to 40 °C.
2) Calculated from the storage capacity of the heat storage and assuming that the hot water cylinder thermostat is set at 60 °C, mains cold water inlet
temperature is at 10 °C and the stored energy utilisation factor of cylinder is 0.85.
3) Calculated from the storage capacity of the heat storage.
4) Recommended setting for the hot water thermostatic blending valve.
5) Power supply for the standby electric heater vial local 2-pole isolator – Only for FlexTherm Eco E type of heat storage.
3.1 Pressure Loss Characteristic
Table 3.1a: Pressure loss characteristic of FlexTherm Eco 3E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.049 4.920 0.016 1.572 0.006 0.640
0.20 0.720 0.197 19.680 0.063 6.289 0.026 2.560
0.30 1.080 0.443 44.280 0.142 14.151 0.058 5.760
0.40 1.440 0.787 78.721 0.252 25.157 0.102 10.240
Table 3.1b: Pressure loss characteristic of FlexTherm Eco 6E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.082 8.228 0.023 2.335 0.010 1.000
0.20 0.720 0.329 32.914 0.093 9.339 0.040 4.000
0.30 1.080 0.741 74.056 0.210 21.013 0.090 9.000
0.40 1.440 1.317 131.655 0.374 37.357 0.160 16.000
Table 3.1c: Pressure loss characteristic of FlexTherm Eco 9E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.114 11.405 0.034 3.405 0.014 1.424
0.20 0.720 0.456 45.620 0.136 13.619 0.057 5.695
0.30 1.080 1.026 102.644 0.306 30.643 0.128 12.814
0.40 1.440 1.825 182.478 0.545 54.477 0.228 22.781

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
10
ENG
4. FlexTherm Eco Controller
4.1 Description
The FlexTherm Eco controller is housed in the unit. The controller parameters can be changed on-site.
Power
>50%
>100%
Heating
Figure 4.1: Controller in FlexTherm Eco Units
4.2 PCB identification
Location of the switches and LEDs is shown in the figure below. Wiring connections for remote control input are shown,
using the 4-way plug in connector.
Standard Configuration
Flextherm Eco controller*
Note: This controller has been shipped with all Flamco Flextherm Eco products from serial # 5204 onwards. The following
advice relates to these products only. For products with a grey controller case please refer to the older version of this
manual.
S3 = Green
S1 = Blue
S2 = Red
Const Solar
J5
N L E E L N
N Earth
PWM 0V T1 0V T2 0V +5V FV FT 0V
SW1
J8
+5V
TX
RX
SDA
SCL
GND
PRG
D1 D3 D4
J9
J4
J3
1
2
3
4
5
6
SW2
D2
J2
J1
J6
D6
D5
D7
J7
0
24
0
8
L
J1
2.5mm² HT cables:
To heang element
via OHT
SW Version
Serial No.
Relay 1
Link 2
Link 1
N
Ingress to
Control box
Sensor
Cable 2.5mm2 Earth
to Outer Case
Neutral
Heater N
Heater L
Live
Coil N
Coil L
8
6
4
2
1
0
L1 L2 N1 N2 1234
S0 = Yellow
2.5mm²

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
11
ENG
Table 4.1: Controller connections
5V input/output 2 J1.6 (FV) Connect to GND for timed boost (user switch)
5V input/output 1 J1.7 (FT) Connect to GND to command element on (PV inverter)
GND J1.8 (0V) Ground for i/o signals
4.3 Installer settings
Options
Depending on the application, dierent options may be selected.
Holding switch SW1 down will show the current setting on the 4 LEDs. Holding this switch down for longer than 5 seconds
will cause the LEDs to cycle. Release switch SW1 when the wanted LED is illuminated, and this choice will be stored.
Please note: The setting for SW2 should always be in Mode 0, meaning that no LEDs are illuminated. This can be checked
by shortly holding SW2 to show the current mode or by holding SW2 for longer than 5 seconds to cycle through the modes
(release when no LEDs are illuminated).
Table 4.2: Controller options and explanation
LED # LED Colour/ Symbol Option Description Explanation
None
D4 D3 D2 D1
Power >50% >100% Heating
Normal mode This is the standard operational mode and is suitable for most
applications.
D1
D4
D3
D2
D1
Power >50% >100% Heating
Deep discharge mode
In this mode the FlexTherm Eco E will call for heat once it has been
almost completely depleted. This mode can be used e.g. when
used as a pre-heat to a combi-boiler.
Note: Using this mode in and electric stand-alone installation can
lead to poor service.
D4
D4 D3
D2
D1
Power >50% >100% Heating
Timer/Boost function mode
In this mode the Flextherm Eco E will only recharge if the circuit
on terminals 3/4 is closed (and remains closed while charging) or
if the boost button is engaged.
Power
>50%
>100%
Heating

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
12
ENG
5. Design of cold and hot water supplies
5.1 General requirements
a. Minimum dynamic mains water supply pressure = 1.5 bar
b. Maximum dynamic mains water supply pressure = 10.0 bar
c. Mains cold and hot water pipe sizes maximum 22 mm OD copper
d. Expansion vessel charge pressure (If fitted) = Incoming mains pressure (bar)
Important: Although the FlexTherm Eco is designed for 1.0 MPa (10 bar) maximum working pressure, it is recommended
than 0.5MPa (5 bar), a approved pressure regulator set 0.5MPa (5 bar) should be fitted.
5.2 Water distribution network design
a. The water distribution network should be sized and designed to comply with the requirements of the relevant sections of
EN1717.
5.3 Hot water circuit including water safety device
Hot water circuit including recommended components
E
A --> cold in HPC
B --> cold in LPC
C --> warm out (LPC)
D --> warm out (HPC)
E --> Water Safety product
Allowed Water Safety product Art.nr. Expansion vessel Art.nr.
France Flexbrane 28360 Flexofit Super 1/2 24980
United Kingdom Prescor PRV 27467 Airfix P 24900
Netherlands Prescor IC 27190 Flexofit Super 1/2 24980
Finland Prescor IC 27190 Flexofit Super 1/2 24980
Belgium Prescor IC 27190 Flexofit Super 1/2 24980
Germany Prescor B 27111 Airfix P 24850
Czech Rep. Prescor IC 27190 Flexofit Super 1/2 24980
Slowakia Prescor IC 27190 Flexofit Super 1/2 24980
5.4 Hard water areas
In hard water areas where mains water hardness can exceed 150 ppm Total Hardness, you must install a scale reducing
device in the cold water supply to the heat storage to reduce the rate of accumulation of limescale.
Water hardness (German scale) < 8,4 °dH
Water hardness (American scale) < 150 ppm
Water hardness (French scale) < 15 °fH

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
13
ENG
6. Installation Guidelines
6.1 General wiring recommendations
a) The heat storage must be earthed.
b) The point of connection to the mains should be readily accessible and adjacent to the heat storage installation.
c) See for general installation “Quick start guide “ FlexTherm Eco
d) Every FlexTherm Eco E unit is equipped with an automatic thermal cut-out (manual reset) to protect the heating element
from overheating.
b
l
l
Figure 6.1: FlexTherm Eco direct electrically heated battery
6.2 FlexTherm Eco E storage
6.2.1 Mains cold water and hot water supplies
The FlexTherm Eco E heat stores are designed for producing hot water in dwellings and are heated directly by electricity.
Therefore, these heat stores are equivalent to direct electrically heated hot water cylinders. The general requirements for
designing hot water network are given in section 4 of this document.
a. Pipe connections – All model in this range: 22mm OD copper.
b. Both heat exchangers must be connected and filled with water during the application, see also section 4.
c. For minimum and maximum working pressures see technical section and section 4.1.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
14
ENG
7. Electrical wiring
The heat storage are supplied with a FlexTherm Eco internal controller.
Please contact Flamco if your application is not covered and you are not sure how to proceed.
Mains supply – Electric storage water heater
Run and connect mains power supply cable (16A, minimum 2.5mm2 CSA) from the local 2-pole isolator to the heat storage
controller as shown in figure 6.1.
Brown (Live): Terminal L1 (Live)
Blue (Neutral): Terminal N1 (Neutral)
Green/Yellow
(Earth): Terminal E (Earth)
Terminal 1 - boost switch
Terminal 2 - 0V
Terminal 3 - PV command signal switch
Terminal 4 - 0V
Figure 7.1: Wiring for electric storage water heater applications
16 Amp
230 V
White Case
Controller Case
Link 2
Link 1
2.5 mm2 , 3 Core HT Flex
Local 2 Pole 16A Isolator
L2 N1
~230V, 16A supply
Live Neutral Earth
N2 1 L1 234
Strain Relief
Figure 7.1: Wiring for electric storage water heater applications

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
15
ENG
8. Flextherm Eco + PV Power Diverter
Controller configuration, settings & applicability
8.1 FlexTherm Eco Controller Settings
Program (SW2): 1
D4 D3 D2 D1
Power >50% >100% Heating
Option (SW1): 0
8.2 Applicability
The following controller configuration applies to Flextherm Eco products from serial no. 5204 only. Units with a lower serial
no. (grey controller) can not be adapted in this way.
The Flextherm Eco is only compatible with modulating AC power diverters. Modulating DC power diverters are NOT
compatible with the product and their use poses a fire risk.
8.3 PV Diverter Configuration
Note: This controller has been shipped with all Flamco
Flextherm Eco products from serial # 5204 onwards. The
following advice relates to these products only.
Warning!
Only modulating AC power diverters can be used with this
appliance.
To install a Flamco Flextherm Eco E heat store with a PV
Diverter, separate the live and neutral going to the heating
element and the controller by removing Link 1 and Link
2 as highlighted in the graphic below. Follow the wiring
instructions provided below and in the power diverter
manual.
Any power diverter used with the Flextherm Eco E should:
- Enable the setting of boost times to charge the Flextherm
Eco E when there was not enough sun during the day.
- Allow cycling of the heating element by not switching o
supply immediately when demand is interrupted (also
known as Hot Cancel Delay) to allow the Flextherm Eco E to
clear its cold start routine if necessary.
Products which do not have these functions may result in
unsatisfactory user experience.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
16
ENG
S3 = Green
S1 = Blue
S2 = Red
Const Solar
J5
N L E E L N
N Earth
PWM 0V T1 0V T2 0V +5V FV FT 0V
SW1
J8
+5V
TX
RX
SDA
SCL
GND
PRG
D1 D3 D4
J9
J4
J3
1
2
3
4
5
6
SW2
D2
J2
J1
J6
D6
D5
D7
J7
0
24
0
8
L
J1
SW Version
Serial No.
Relay 1
N
Ingress to Control box
Sensor
Cable 2.5mm2 Earth
to Outer Case
L1
Neutral
Heater N
Heater L
Live
Coil N
Coil L
8
6
4
2
1
0
L2 N1 N2 1234
S0 = Yellow
2.5mm² HT cables:
To heang element
via OHT
2.5mm²
White Case
Controller Case
Local 2 Pole 16A Isolator
L2 N1
~230V, 16A supply
Live Neutral Earth
N2 1 L1 2 3 4
Modulating AC Solar
Power Diverter (Check
product wiring
instructions)
SW1
Boost switch
Volt-Free signal
switching
SW2
PV inverter command
signal
Volt-Free signal switching
Strain Relief
Link 1
removed
Link 2
removed
WARNING
To prevent the hazard of dual supply to the heat battery, the constant live to the controller and the Power Diverter must
come from the same circuit breaker, allowing to isolate both sources of power to the FlexTherm Eco E at the same time.
Modulating AC (from Power Diverter OUT to heating element.Constant AC supply to PCB and Power Diverter IN.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
17
ENG
9. Commissioning
9.1 General
CAUTION
Before commissioning the Heat Battery, first check that you have properly reviewed the previous
sections, particularly regarding Heat Battery specifications as well as location, electrical supply
and water supply requirements.
CAUTION
The Heat Battery and its associated pipework MUST be filled and fully vented in both Primary and
Secondary circuits before the Heat Battery power supply is switched on.
9.2 Pre-commissioning checklist
• Check all packaging material has been removed.
• Check all components are clean and undamaged.
• Adjust PRV on Cold Mains Supply if the Pressure exceeds 5 Bar (0.5MPa).
• f present, adjust the flow regulator valve to within the maximum recommended flow rate for the Heat Battery
size installed.
• f required, adjust the Auto-bypass valve on the primary circuit to the recommended flow rate for the Heat
Battery size installed.
9.3 Commissioning process
1. Check that the temperature sensor of the Heat Battery has not become dislodged during transport
and is fully inserted into its pocket. The white marker should be sitting on top of the blue cable gland.
2. Turn on the water supply and check that there are no leaks
3. Fully open any hot water taps in the dwelling and allow it to run for a minimum time of 2 minutes.
This is for any air to leave the system. This may vary depending on Heat Battery model size.
Notice
For larger models such as the FlexTherm Eco G1 the minimum flush time should be increased to 4 minutes.
4. Switch on the power supply to the Heat Battery, External Heat Source and solar power diversion
controller (if fitted).
5. Check the front of the Heat Battery to ensure that the “power” LED is lit (see Figure 10 & Table 7).
6. Apply the relevant DHW settings for the External Heat Source (For settings for compatible heat pumps,
please check D0086).
7. Observe on the External Heat Source controller interface if the DHW demand has been activated and
the External Heat Source Diverter Valve has moved into DHW position.
8. If present, press the BOOST button on the solar power diversion controller to start charging the Heat
Battery. The operation of the External Heat Source in DHW mode, will be paused and the Heat Battery
heating element will engage, observe if the “heating element” LED is lit (see Figure 10 & Table 7).
9. Allow the Heat Battery to charge for approximately 30 minutes with the hot water tap closed.
10. If using the heating element for charging, eg when using a PV key, please note that on first charge
or when the Heat Battery has been switched o and cooled down the heating element will cycle ON
and OFF for up to one hour, depending on the Heat Battery size. This is normal operation. If heating
element cycling persists for more than one hour.
a. If fitted with a Solar Power Diverter, please apply a setting to ensure that the Heat Battery
does not stop charging while it is cycling during start up. Please refer to the Solar Power Diverter
Manual.
11. Aer 30 minutes open the hot water tap/s and check for hot water.
12. Adjust the Hot Water Tempering Valve if installed, so that the output temperature is 45°C to 55°C.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
18
ENG
13. Check hot water temperature at all hot water outlets in the dwelling with the customer and advise on
temperature settings.
14. Ensure that the Heat Battery charges to half charge and that there are no lights flashing (which may
otherwise indicate an error.
15. If the Heat Battery is fitted with a Solar Power Diverter - Pre-planned Boost times should be set on the
Solar Power Diverter, the information on how these are set can be found in the relevant section of the
Solar Power Diverter manual. These depend on the end user usage type of the system.
16. Once the installation is finished, please carry out the following steps:
• Explain to the customer / end user all safety precautions.
• Fill in and return the Commissioning certificate provided with the Heat Battery. These
documents MUST be completed and returned to Sunamp aer the installation to obtain the extended
warranty.
• Leave all product information and literature with the customer / end user.
• It’s the responsibility of the end user to supply this manual to any other subsequent users.
Final Fit Aer Commissioning:
Commissioning instructions are provided in this Section 7 of the manual. Follow the instructions below aer
commissioning.
• Cut the 32mm thick insulation layer to suit the tube and cable entries. This layer has several perforations for
guidance. This can be done with a sharp knife or scissors. Please DO NOT cut inside the Heat Battery and near
the Vacuum Insulation panels located at the side of the Heat Battery.
• Re-place the newly cut 32mm thick insulation layer nesting the insulation around the tube work and cables.
Makes sure the main and signal cables sit above this layer.
• Re-place the top layer 10mm layer of insulation.
• Re-place the lid, aligning the rear pins with the slots in the rear of the unit, slide back, fit the 2 x M5 button head
cap screws using 3mm hex head.
• Fix any Energy labels provided in the document pack to product main body.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
19
ENG
10. Maintenance
CAUTION
Where undertaking maintenance, repairs or removals, ensure that the system is first dis-connected
from the electrical and/or water supply.
• In areas where the mains water hardness can exceed 150 ppm Total Hardness and a scale-reducing device has
been fitted, the service and maintenance requirements of this device (especially re-fill requirements) need to
be adhered to.
• The air pressure in the expansion vessel should be checked every 2-3 years and topped up if necessary. Please
refer to the expansion vessel manufacturer’s instructions.
• Except as identified above, the Heat Battery does NOT require any regular maintenance.
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard. Please refer to the Electrical wiring sections.
11. Troubleshooting
Fault Possible Cause(s) Possible Solution
The Heat Battery does not deliver hot water aer
installation
Issue with External Heat Source Refer to External Heat Source manual. If using a
FlexTherm Eco G1, the DSR/ Boost or back-up switch
can be used to supply hot water in this instance.
If using a FlexTherm Eco G1 with Solar Diversion
Control, the boost button on the solar power diverter
will activate the heating element inside the Heat
Battery (given there are no issues with the power
supply to the Heat Battery or Solar Power Diverter).
Please note this will result in higher electricity costs if
this is activated in a continuous mode.
Heat Battery not powered or not powered correctly Check wiring and power supply to Heat Battery and
rectify where necessary
Solar Power Diverter not powered or not powered
correctly (please note this ONLY applies if Heat
Battery installed with a Solar Power Diverter)
Check wiring and power supply to Solar Power
Diverter and rectify if necessary.
Non-self-resetting thermal cut-out has tripped Make sure the Heat Battery is full of water and purge
if necessary:
1. Disconnect the power supply
2. Open the electrical cover at the base of the Heat
Battery (Figure 1 -RHS image)
3. Reset the non-self-resetting thermal cut-out on
Le Hand side of the panel.
4. Check if the temperature sensor is fully inserted in
the Heat Battery (Section 7.3)
5. Reassemble the Heat Battery, and
6. Reconnect the supply.
If the problem persists, please contact Flamco.
LED D4 (power symbol) is rapidly flashing Temperature sensor string is faulty Check that the sensor cable is properly connected
to the PCBA and that the connector block or screw
terminal is making good contact.
If the problem persists, please contact Flamco.
The flowrate from the Heat Battery is lower than
expected
Air might still be trapped in the system Check that the mains supply valve is fully opened.
Make sure the Heat Battery is fully de-aired and
purge if necessary.
Incoming water pressure is too low Measure the incoming pressure from the mains
supply and contact Flamco.
Table 8. Troubleshooting of FlexTherm Eco G1

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
20
ENG
12. Decommissioning & disposal
12.1 Decomissinoning
To successfully decommission the Heat Battery, please carry out the following steps:
1. Switch o all Electrical Power Supplies to the Heat Battery.
2. If Heat Battery is charged and no leaks are present, cool down the Heat Battery by flowing cold water through,
until the temperature at the Outlet side is equal to the temperature at the Inlet.
3. Isolate the Cold Mains Supply to the Heat Battery.
4. Open the hot water taps to drain the secondary circuit system and release the pressure in the pipe work.
5. Drain the primary circuit that is connected to the External Heat Source.
6. Remove all electrical cables and connections from the Heat Battery controller.
7. Remove all pipework from the Heat Battery connections, using appropriate tools and methods. Cap pipework if
it cannot be removed from the Heat Battery connections.
8. Ensure that the Heat Battery is le to cool for at least 60 minutes aer completion of step 2 before moving it.
12.2 Disposal
This symbol on the Heat Battery and accompanying documents means the Heat Battery should
not be mixed with general household waste at the end of its life.
For proper treatment, recovery and recycling, please take the Heat Battery to designated
collection points where it will be accepted free of charge at the end of its life.
Disposing of this Heat Battery correctly will help save valuable resources and prevent any potential negative
eects on human health and the environment, which could otherwise arise from inappropriate waste handling.
Please contact your local authority for further details of your nearest designated collection point. Penalties may
be applicable for incorrect disposal of this waste, in accordance with your national legislation.

Manual FlexTherm Eco G1
We reserve the right to change designs and technical specifications of our products.
21
The Netherlands
hydronic flow control
[phone]
[e-mail]
www.flamcogroup.com
Contact
Denmark
Flamco Denmark
[phone]
[e-mail]
Hungary
Flamco K
[phone]
[e-mail]
Belgium
hydronic flow control
[phone]
[e-mail]
France
hydronic flow control
[phone]
[e-mail]
Russian Federation
ООО „Майбес РУС“
[phone]
[email protected]
Switzerland
Flamco AG
[phone]
[e-mail]
Estonia
Flamco Baltic
[phone]
[e-mail]
Italy
Flamco Italy
[phone]
[e-mail]
China
Flamco Heating Accessories
(Changshu) Ltd, Co.
[phone]
[e-mail]
Germany
Meibes System-Technik GmbH
[phone]
[email protected]om
Slovakia
Flamco SK s.r.o.
[phone]
[email protected]
United Arab Emirates
Flamco Middle East
[phone]
[e-mail]
Finland
Flamco Finland
[phone]
[e-mail]
Poland
Flamco Meibes Sp. z o.o.
[phone]
[e-mail]
Czech Republic
Flamco CZ s.r.o.
[phone]
[email protected]
Germany
Flamco GmbH
[phone]
[e-mail]
Sweden
Flamco Sverige
[phone]
[e-mail]
United Kingdom
Flamco Limited
[phone]
[e-mail]