STIEBEL ELTRON EAC 5 Instruction Manual

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)
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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 inthe 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
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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 dayof 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.
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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/LZsignals
yes
no
no
no
Fixed
LF/LZ signals
yes
yes
yes
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 orif the
charge release is missing (signal values as per DIN EN
50350that 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 upfor 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.
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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