STIEBEL ELTRON EAC 5 Operation Instruction

Brand: STIEBEL ELTRON

Model: EAC 5

Type: Operation Instruction

Charge controller

» EAC 5

OPERATION AND INSTALLATION

CONTENTS

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Contents

Scope of delivery ................................... 3

Overview ................................................ 4

Functions................................................ 5

Charge Controller ..................................... 5

Applications .............................................. 6

System Control ......................................... 7

Heat Demand .......................................... 10

Charge Release ...................................... 14

Charging Models ..................................... 16

Control System ....................................... 19

Password System ................................... 20

User Interface ......................................... 21

Installation ............................................ 22

Mounting ................................................. 22

Wiring...................................................... 23

Start-up ................................................... 26

User menu ........................................... 32

Idle screen .............................................. 32

Operation ................................................ 35

Information .............................................. 40

Setup ...................................................... 42

Installer Menu ...................................... 45

Information ............................................. 50

Service ................................................... 56

Detail Settings ........................................ 56

Appendix .............................................. 69

Sensor characteristics ............................ 69

Troubleshooting ...................................... 74

Specifications ......................................... 77

Guarantee, environment and recycling 80

Safety and Installation Instructions ...... 81

Safety Instructions

When installing this device or working on it always observe

the safety instructions given at the end of this document!

SCOPE OF DELIVERY

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Scope of delivery

Charge Controller EAC 5

Installation quick reference guide EAC 5

(for the installer)

Operation instructions EAC 5

(for the user)

Pencil (Rubber tip can be used to operate the Touch Display)

ENGLISH

OVERVIEW

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Overview

The charge controller EAC 5 has been designed for use in

heating systems with electrical storage heaters.

The EAC 5 implements the basic functions of a central

control unit as defined in the standard DIN EN 50350:

 Calculate the heat demand based on the outdoor tem-

perature,

 Process the charge release signals of the distribution

network operator (with/without time function),

 Output the charge release signal and the target charge

rate to the storage heaters.

As opposed to a central control unit according to the

standard, the EAC 5 implements additional comfort

functions to meet the preferences of individual users. This

includes e.g. a week program for a timed control of the tar-

get charge rate, a holiday program for vacation periods and

the capability to connect to an internet-based server; see a

subsequent chapter.

The type of outdoor temperature sensor can be chosen from

a range of types well-established in electrical storage heat-

ing systems. For the control signal, a duty cycle AC output

(ED) is provided.

The charge controller EAC 5 provides several applications,

selectable during installation, which allow to choose the

charging model (Classic, Self-learning, Reduced).

Complementary devices

Because of its TGN bus connectivity the charge controller

EAC 5 is compatible to the "Electrical Energy Storage Heat-

ing" family of devices made by tekmar Regelsysteme GmbH.

Additional information about the available devices can be

found at www.tekmar.de.

FUNCTIONS: CHARGE CONTROL

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Functions

Charge Controller

The fundamental difference between the new EAC 5 and a

conventional central control unit is the availability of time

functions.

A central control unit does not know date or time. The reac-

tion on release signals is always spontaneous, i.e. the central

control unit is "surprised" by every new signal and reacts ac-

cording to its parameter settings.

The EAC 5, however, knows the current date and time and

ideally has information on outdoor temperature, release sig-

nals and user preferences (time schedules) for the next 24

hours. This enables the EAC 5 to establish an energy forecast

which calculates and controls the optimal charging within

the next 24 hours.

Accordingly, date and time must always be set correctly in

the EAC 5. If an internet gateway (special accessory from

tekmar) is connected, this will happen automatically through

the internet.

Subsequently, the individual functions of the controller fami-

ly are explained, which can be found in the following menu

items:

 Applications

 System Control

 Heat Demand

 Charge Release

 Control System

 Password System

 User Interface

ENGLISH

FUNCTIONS: APPLICATIONS

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Applications

An application which is to be selected during installation de-

fines the charging model:

 Classic: Charging model forward or backward control as

per DIN EN 50350 with the familiar parameter settings

 Self-learning: Self-learning charging model that can be

used for almost all release models * and adapts the charg-

ing process to the outdoor temperature, the release times

and the user preferences (heat level, time programs) by

means of a forecast calculation

 Reduced: like Self-learning, however, for release models

with reduced power demand (e.g. 19 hours charge release

with 55% power reduction) and phase sequence control

(tekmar type PSS)

The selection of an application also includes the definition of

a series of basic settings which can be set individually in the

"Detail settings" menu to match the specifics of a particular

installation.

* not for variable charging models, where the release times depend

on outdoor temperature or day of week. For these, the correct se-

lection is

Classic / Forward control w/o time function

FUNCTIONS: SYSTEM CONTROL

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System Control

The system control summarizes the results of the heat de-

mand calculation and the charge release, forwards these to

the selected charging model and applies

preferences in order to calculate the charging and finally to

output the charging signals as per selected output model.

By setting the operating mode, the heat level and the weekly

or holiday program, the user can define the target room

temperature which the system is to achieve, depending on

the time of day and day of week. Additional parameters al-

low to scale the heat level. The heat level 3.0 always refers to

the heat limit temperature set by E2 in the heating curve

plus 2 K internal gain of the room (factory default 18 °C + 2 K

= 20 °C).

Selectable operating modes:

 Standby: heating operation off, only frost protection ac-

tive

 Manual: manual setting of the heat level through the

menu or online

 Automatic: time-dependant automatic setting of the heat

level through weekly programs and holiday periods

Heat level adjustment:

 Frost protection: room temperature reduction to the pre-

set frost protection level (factory default 10 °C)

 1.0 ..: minimum target room temperature

(factory default 15 °C)

 .. 5.0: maximum target room temperature

(factory default 25 °C)

Charging model

The control model defines how the target charge rate is cal-

culated from the desired heat level, the heat demand and

the charge release. The available charging models depend

on the application Classic or Self-learning (or Reduced).

Classic charging models as per DIN EN 50350:

 Forward control without time function (FWCw/oT)

 Forward control with time function (FWCwT)

 Backward control (BWC)

For a description of these charging models see the corre-

sponding standard.

Self-learning charging models of the EAC 5:

 Temperature forecast (TempFcast)

 Energy forecast (EnerFcast)

The energy forecast summarizes the future trends of heat

demand, release values and user preferences and calculates

the resulting target charge rates of the next 24 hours by

means of a simulation of the flat.

ENGLISH

FUNCTIONS: SYSTEM CONTROL

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The temperature forecast is an automatic fallback system in

case the input data for the energy forecast is not entirely

present as a time series. To calculate the target charge rate

only the current data at the point in time "now" is taken into

account.

The following table shows for which release method (see

section Charge Release, page 14) the individual charging

models can be used (Bold print = optimal setting).

Charging

model

Release

method

Forward without

time function

Forward with

time function

Backward

Energy

forecast

Variable

LF/LZ signals

yes

Fixed

LF/LZ signals

yes

Output model

The output of the signals to the main contactor (output SH)

and to the storage heaters is adjusted to the operating mode

of the installation by means of the control model for the SH

contactor:

 SH Release: the SH output is switched on when the charge

release signal is present (on delay 25 s), and the ED signal

takes safety steps if the target charge rate = 0 or if the

charge release is missing (signal values as per DIN EN

50350 that represent a negative rate of charge).

 SH Charging: like SH Release, however, the SH output is

switched on only if the target rate of charge > 0.

 CR Standby: the SH output is switched on or off depend-

ing on the release signal; the target charge rate is continu-

ously output through the ED signal, independent of the re-

lease signal (only for special cases).

 ED Switch-off: the SH output works as with SH Charging

(on delay 480 s), however, the ED signal is switched off if

the target charge rate is = 0 or if the charge release is miss-

ing.

The model ED Switch-off should particularly be used for

storage heaters with thermo-mechanic charge controllers.

Switching off the ED control voltage outside the release pe-

riods saves the energy for heating these controllers, particu-

larly during summertime. If electronic controllers are present

this model cannot be used as these can possibly recognize

this as a fault and switch to emergency operation.

The control of the signal output can assume the following

states:

FUNCTIONS: SYSTEM CONTROL

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 Reset: initialising

 Switched Off: signal output switched off;

charge signal = 0%, SH relay off

 Start-up: starting up for 120 s after controller power-up;

charge signal = 0%, SH relay off

 Off Standard: no release signal, or where appropriate tar-

get charge rate = 0%;

charge signal = 0%, SH relay off

 Off ED Thermic: no release signal, or target charge rate =

0%;

charge signal ED switched off, other charge signals = 0%,

SH relay off

 Off SH Standby: no release signal;

charge signal according to calculation, SH relay off

 Starting: signal output is starting as release signal is pre-

sent and target charge rate > 0%, delay time running;

charge signal according to calculation, SH relay off

 Operation: normal operation, release signal present and

where appropriate target charge rate > 0%;

charge signal according to calculation, SH relay on

Note: When using the models CR Standby or ED Switch-off it

is essential to switch the heating current of the entire instal-

lation with a main contactor which is driven from the SH

output.

ENGLISH

FUNCTIONS: HEAT DEMAND

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Heat Demand

Depending on availability, the heat demand calculation is

based on the outdoor temperature values measured by the

temperature sensor which is connected to the system (by

wire, alternatively by radio) or optionally with additional

tekmar devices. Both sources are evaluated independently of

each other as individual values or, if possible, as a time series.

If both sources are equally available the weather forecast

takes precedence for the determination of the effective out-

door temperature as it provides a more substantiated future

prediction.

Additionally, the system carries along an outdoor tempera-

ture substitute value which is automatically adjusted to the

current effective outdoor temperature on a daily basis and

can be adjusted manually if failures persist over extended

periods.

The result of the heat demand calculation is the current heat

demand and as far as can be determined the future series

of the heat demand for the next 24 hours.

States

Depending on the availability of both of these sources, the

heat demand calculation can assume the following states:

 Reset: initialising

 Substitute value: both sources at fault, substitute value is

used

 OT Measured value: outdoor temperature sensor active,

only measured value available (normally for some time af-

ter power-up)

 OT Value now: outdoor temperature sensor active, current

individual value including building thermal inertia availa-

ble

 OT Value trend: outdoor temperature sensor active, time

series with pseudo future available

 Weather hour: weather forecast active, only single value

for the next hour available

 Weather future: weather forecast active, only forecast

available

 Weather now: weather forecast active, current single val-

ue including building thermal inertia available

 Weather trend: weather forecast active, complete time se-

ries available

 Error: calculation module internal error

Building thermal inertia

The indoor temperature of a building follows a change of the

outdoor temperature only with a time delay that depends

mainly on the building mass (type of structure) and its insu-

lation. An efficient heat demand calculation must take this

FUNCTIONS: HEAT DEMAND

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into account as otherwise unnecessary heating phases

would occur, particularly during the transitional period.

To match this calculation with the respective building the

two main influencing factors can be set through a single pa-

rameter.

Type of

structure

Insulation

light

normal

heavy

bad

light +

bad

normal +

bad

heavy +

bad

normal

light +

normal

normal +

normal

heavy +

normal

good

light +

good

normal +

good

heavy +

good

For testing purposes the building thermal inertia can be dis-

abled.

The past values of the outdoor temperature (outdoor tem-

perature sensor or historical weather data) are subject to the

selected delay time and result in the so-called "effective out-

door temperature".

Heating characteristic

The heating characteristic is defined by three parameters

and uses the effective outdoor temperature to calculate the

heat demand and thus the target charge rate, which is

passed on to the storage heaters and the charging control-

lers, respectively.

 Full charging (E1): rated outdoor temperature which re-

quires the heating system to provide its full power to

achieve the standard room temperature of 20 °C (heat

demand = 100%)

 Start of charging (E2): outdoor temperature below which

the heating operation commences

 Base charge at start of charging (E15): target rate of

charge to be output at start of charging

The E numbers refer to the definitions given in the standard

DIN EN 50350.

Thus, the heat demand is varied through the heating charac-

teristic from the base charge at start of charging to 100% at

rated full power.

ENGLISH

FUNCTIONS: HEAT DEMAND

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Here, the rated outdoor temperature is a fixed value of the

heating installation inside the building. Initially, the base

charge depends on the type of heating element, however, it

can be modified to some extent by the user preferences. The

start of heating can be adjusted to the individual user pref-

erences.

Heat demand factor

Frequently, houses and flats that are equipped with electrical

storage heating are already older and have been energetical-

ly improved since their construction (e.g. by fitting new win-

dows or a cladding insulation) without the heating installa-

tion having been adapted accordingly. In these cases, the

parameter heat demand factor allows to match the current

heat demand at design temperature with the original heat

demand at system installation time.

The heat demand factor corrects the heat demand calculat-

ed from the heating characteristic to the new value required

after refurbishment.

The new heat demand has to be calculated (heat require-

ment calculation) or estimated. An estimation can be based

on e.g. a typical specific heating load which is assumed for

the year of construction or the year that corresponds to the

refurbishment standard, respectively:

FUNCTIONS: HEAT DEMAND

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Year of construction

Heating load [W/m²]

< 1958

180

1959-68

170

1969-73

150

1974-77

115

1978-83

1984-94

> 1995

KFW 60

KFW 40

Passive house

The heat demand factor is calculated as:

HDF = Heating load(Refurbishment) / Heating load(Year of

construction) * 100

Example: Year of construction 1966 and Year of refurbish-

ment standard 1990 makes a HDF of 75/170*100 = 44%.

A heat demand factor (HDF) calculated by this method

should be adapted according to the user experience some

time after installation of the controller (too cold: increase

HDF, too warm: decrease HDF).

ENGLISH

FUNCTIONS: CHARGE RELEASE

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Charge Release

The charge release is derived from the release information of

the distribution network operator (DNO) and determines

when a charging of the storage heaters may occur.

This is done by the charge controller and is based on the sig-

nals LF, LZ and LL as defined in the standard EN 50350 which

are normally created locally by a ripple control receiver or a

time switch.

These release signals have the following functions:

 LF: standard charge release for the main charging period

(in classic charging models the 8 hours charging at night)

or the additional charging time with low tariff.

 LZ: additional charge release, e.g. for additional charging

during the afternoon; possibly with high tariff if required,

signal is not used by every DNO.

 LL: start signal of clockwork that starts the time functions

of the charging models backward control (BWC) and for-

ward control with time (FWCwT); signal is sent separately

only by a few DNOs.

Concerning the use of these signals the technical connection

conditions of the corresponding network operator have to

be followed in any case.

Release memory

To have a future series of release times available for self-

learning charging models, this application stores the release

signals of the past 24 hours in steps of 15 minutes as it is to

be expected that the release times of the next 24 hours will

repeat in the same way.

Note: This does not or only conditionally apply to release

signals that depend on outdoor temperatures or week days

and holidays; thus this function is not suitable for such re-

lease signals of the DNO. Normally, these cases only allow

the use of the classic charging model forward control w/o

time (FWCw/oT). Alternatively, one can apply to the network

operator and ask for fixed release times.

Linkage LF-LL

As nearly all DNOs supply the signals LF and LL simultane-

ously (if LL is transmitted at all), the controller provides an in-

ternal linkage function that uses the LF input to create not

only the LF signal but also the LL signal. This linkage can be

disabled by a parameter and assigned to the input LX to feed

the controller with a separate LL signal. For the self-learning

charging models LL is not required.

FUNCTIONS: CHARGE RELEASE

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High tariff charging lock

Frequently, electrical storage heating systems are sized such

that an additional charging time during the day, if available,

is needed only in cold weather. If this additional charge is

billed at high tariff it is even more desirable to use the addi-

tional charging time only on particularly cold days.

To achieve this a high tariff inhibit signal can be defined that

refers to the input LZ or LX (if not assigned to a separate LL

signal, see above), respectively, and the parameter of which

offers the following selections:

 Off: no high tariff lock

 LZ  HT: high tariff lock if LZ = on

 LX  HT: high tariff lock if LX = on

 LX  NT: high tariff lock if LX = off

The corresponding temperature limit, above which the lock

is effective, can be set or disabled in the heat demand sec-

tion.

Time function cut-off

When using the charging models FWCwT or BWC the time

function can be temporarily disabled (the clockwork keeps

running independent of this cut-off) by simultaneously excit-

ing the terminals LF and LZ and activating the model

FWCw/oT. Depending on the value of the parameter FBD

this is effective either only during the night or during the en-

tire day.

States

Accordingly, for charge release the following states are de-

fined:

 Reset: Initialisation

 Off: processing release off

 L* signals: release is based on signal inputs LF and LZ.

 Memory learning: like L* signals, release memory activat-

ed but still in learning mode (for up to 24 hours after pow-

ering-up the controller).

 Memory: like L* signals, additionally calculated charge re-

lease prediction for the next 24 hours available.

The result of the charge release calculation is the current

charge release and as far as can be determined the future

series of the charge release for the next 24 hours.

ENGLISH

FUNCTIONS: CHARGING MODELS

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Charging Models

A charging model translates the identified heat demand, the

settings into a target charge rate. Depending on the selected

application, one or more of the following charging models

are available.

Energy forecast

For the energy forecast, the future values of the heat de-

mand, the release signal and, if required, control values of

the distribution network operator are used, together with

the heat level desired by the user, to determine the current

and the future charging demands by means of a simulation

of the next 24 hours. Additional to these time series, the pa-

rameters installation type and charging time for 100%

charge are evaluated.

The timed heat level presets are to be defined by a week

program which makes sure that the charging is adjusted ac-

cording to the comfort requirements of the user (e.g. as a

night-time set-back). With this charging model, a manually

adjusted heat level is normally not reasonable.

The energy forecast requires a predictive release for the sim-

ulation and thus is reasonably usable only with the release

methods fixed LF/LZ signals, release program and timetable.

Note: The model energy forecast should not be used in con-

junction with charging times that depend on the outdoor

temperature as this can occasionally lead to unsuitable

charge predictions.

The system states of this model are:

 EnerFcast Off: charging model not activated (no release or

no heat demand)

 EnerFcast RTtarg: calculation of target charge rate with

heat demand correction by target room temperature.

Temperature forecast

The temperature forecast model is the automatic fall-back

model in case there is no sufficient time series for an energy

forecast.

The required charging is determined by the current release,

the current value of the effective outdoor temperature and

as far as available the time series of an outdoor tempera-

ture forecast. The corresponding heat demand is calculated

from the heating characteristic; corrected, if need be, by a

deviating target room temperature or a control value of a

timetable.

The system states of this model are:

 TempFcast Off: charging model not activated (no release

or no heat demand)

FUNCTIONS: CHARGING MODELS

www.stiebel-eltron.com EAC 5 | 17

 TempFcast RTtarg: calculation of target charge rate with

heat demand correction by target room temperature.

Classic as per DIN EN 50350

The charging models forward control (FWC) and backward

control (BWC) are the classic charging models according to

DIN EN 50350. This standard and the charging methods de-

fined therein were developed when analogue electronic

controllers with mechanical clockwork were still state of the

art. Accordingly, their "intelligence" is limited to counting

the time and directly processing the effective outdoor tem-

perature.

The two forward control models FWC differ in the way the

time information is treated by the clockwork release (logic

signal LL, normally combined with LF). The model FWCw/oT

ignores the time information, i.e. with every release the

charging is based on the target charge rate from the heating

characteristic and the current heat level. In the model

FWCwT, the charge rate drops down to the corresponding

additional daytime charge (E10) after the daytime changeo-

ver (E12).

These methods are mainly used with charging times 8+0h

and 8+2h, respectively. Other charging times can be imple-

mented, this, however, frequently requires a precise adjust-

ment of the time parameters E3, E11, E12, E13 as well as, if

required, E14 and/or a separate processing of the clockwork

release LL (see section Charge Release, page 14).

The following sketch shows a typical trend of a target charge

rate over a day in a backward control including the E para-

meters involved:

ENGLISH

FUNCTIONS: CHARGING MODELS

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In the control models FWCwT and BWC the correct determi-

nation of the runtime, i.e. the reading of the electronically

emulated historical clockwork, is essential. The clockwork is

started with the signal LL at the beginning of the night

charging time and stopped after the lapse of E13 until a new

start occurs.

In case of a loss of power the controller restores the reading

of the clockwork, precisely timed, from the last start of LL

and the current time of day. Should the controller have lost

its time due to an extended loss of power (e.g. summer

switch-off), it is possible to set the current runtime manually

additional to the time of day.

Due to their fixed structures and their use in conjunction

with the traditional "night charging times" these models are

not (BWC) or hardly (VWC) usable in conjunction with week

programs that work with varying heat levels over the day.

The parameters E1 (full charging), E2 (start of charging) and

E15 (base charge at start of charging), additionally specified

in the standard, define the heating characteristic of the in-

stallation and are valid for all charging models. Hence, they

are contained in the heat demand section.

States

The system states of these models are:

 Off: Charging model not activated (fault)

 Night operation: runtime  E12, LF not set

 Night release: runtime  E12, LF set, no charging

 Night charging: runtime  E12, LF set, charging active

 Day operation: runtime  E12, LF/LZ not set

 Day release: runtime  E12, LF/LZ set, no charging

 Day charging: runtime  E12, LF/LZ set, charging active

 End of day: runtime  E13, re-start with activation LL

 Forward w/o time: charging as per heating characteristic

without runtime

 Fault LF mon: fault detected by LF monitoring (only floor

heating installations)

For additional explanations of these charging models see

DIN EN 50350.

Note: The models FWCwT and BWC must not be used in con-

junction with outdoor temperature dependent charging

times.

FUNCTIONS: CONTROL SYSTEM

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Control System

The control system outputs the target charge rate to the

storage heater devices.

The AC control system, due to its nature as a burst-firing con-

trol also called ED system (Einschalt-Dauer = duty cycle),

works with a control signal in the 230 V power line.

The ED system can be set to different specific values (e.g.

80%, 72%, 37%), with the specific value defining the duty cy-

cle of the burst-firing control which represents a target

charge rate of 0%. Thus, if ED system = 80% a duty cycle of

80% transmits a target charge rate of 0%. (Attention, reverse

relationship: high ED value = low charge rate)

With the ED system it is necessary to differentiate between

electronic and thermo-mechanical controllers in the storage

heaters. Thermo-mechanical controllers require a compensa-

tion of the line voltage (power measurement) which would

lead to false readings of the charge rate in electronic control-

lers (counting of the 50 Hz half waves). Electronic controllers,

however, frequently have a control signal loss detection. For

these controllers, an ED signal representing 100% target

charge rate still must have a base duty cycle of 2%.

All characteristics of the control signals are adjustable

through corresponding parameters.

ENGLISH

FUNCTIONS: PASSWORD SYSTEM

20 | EAC 5 www.stiebel-eltron.com

Password System

The controllers provide a facility to set passwords for four

menu levels (level 0

Information

is always freely accessible).

This e.g. makes sense to ensure that the controller can be

configured only by qualified personnel. A password consists

of four digits and can be set individually for each of the four

levels. The password 0000 disables the password protection

of the corresponding level.

Password protection of the menu items:

Information

Level 0

Operation

Password level 1

Setup

Password level 2

Installer

Password level 3

A password for a higher level is also valid for the levels be-

low, i.e. somebody who has access to a higher level, has au-

tomatically access to the levels below even if the passwords

of these levels are not known.

In case a password is forgotten or is not accessible any more

for another reason (e.g. change of the installer) a super

password allows to delete the passwords of the levels 1 to 3

and thus to unlock the controller. The super password is

documented in the chapter "Installation". In case of prob-

lems the technical customer service can be contacted.

Note: The password of a lower level can be set only if all

passwords of the higher levels have already been set.

Factory settings:

 0000 for levels 1, 2 and 3.

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STIEBEL ELTRON EAC 5 Operation Instruction

STIEBEL ELTRON EAC 5 Operation Instruction

STIEBEL ELTRON EAC 5 Operation Instruction

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