STIEBEL ELTRON FEK Operating And Installation Instructions

26_03_01_0106

270783

FEK

Control module
Operating and installation instructions

Index

1. Operating instructions 2

for users and contractors

1.1 Equipment description 2

1.2 Equipment overview 2

1.3 Important information 2

1.4 Operation 3

1.5 Settings 3

2. Installation instructions 12

for contractors

2.1 Standard delivery 12

2.2 General 12

2.3 Installation 12

2.4 Specification 13

2.5 Commissioning 13

2

1 Operating instructions for users and contractors

1.1 Equipment description

The FEK control module only works in
conjunction with the weather-compensated
WPMi control unit. It enables the convenient
entry and display of system parameters, e.g.
outside temperature, relative humidity and
heating circuit parameters (e.g. heating times
and required room temperature) for the
heating system from the user’s living room.
This allows the constant monitoring and
optimising of the heating system, both in
heating and in cooling mode.
In addition, hooking up a room temperature
enables the correction of the weather­compensated WPMi control unit.

1.2 Equipment overview

1.2.1 With closed control flap and standard
display

Relative humidity

Heating times

Time

Room temperature

Day

1.2.2 With the control flap open and with all
indicator elements on display

2

1

1 Programming indicator
2 + key
3 PRG key
4 - key
5 Reset

1.3 Important information

3 4

The control module must only be
installed and maintained by qualified
contractors.

5

C26_21_01_0011

1 2

1 Away key
2 Operating mode key
3 Help key
4 Rotary selector for changing the set

room temperature ± 5 K

3 4

1.4 Operation

The operation is split over three control levels.
Control levels
and contractors alike. Control level 3 is only
designed for qualified contractors:

Control level 1

This enables the adjustment of operating
modes, such as standby mode, programmed

C26_21_01_0010

operation, constant day or setback mode (for
this, see section 1.5.1).

Control level 2

This enables parameters, such as room
temperature, heating programs, etc. to be
adjusted (for this, see section 1.5.5).

1 and 2 are accessible to users

(control flap closed)

(control flap open)

3

Control level 3 (for contractors only)
This level is protected by a code and should
only be used by contractors. At this level,
heat pump and system-specific details are
determined (for this, see section 2.5).

1.5 Adjustments (control level 1)

With the flap closed, the display shows the
operating mode, time and day, as well as
the current room temperature and relative
humidity.

1.5.1 Operating mode key

Vital facts in brief

Settings

All adjustments follow the same pattern:

Opening the control flap toggles the FEK
to control level 2. The display shows the
parameter “room temp.”.
Pressing enables you to adjust the
parameter you want to change.
Press to change the value of the
parameter. You can change the currently
displayed value with
indicator is illuminated. Press again, the
indicator then extinguishes and the new
set value has been saved. You can modify
further values for this parameter by pressing

or , if the red indicator has not been
extinguished after saving.
The programming step can only be
terminated when the red indicator has
extinguished.

Terminating programming

You can terminate the programming process
after entering and saving the required
parameter changes by closing the control
flap. However, if you want to make further
changes, press one of the keys until the
display shows BACK, then press
will return you to the previous level. Closing
the control flap with illuminated indicator
returns the FEK into its original position. The
modified value will then not be saved.

or , when the red

. This

When connecting a FEK, only the operating
modes for the pre-selected heating circuit are
adopted by the WPMi.

You can select the required operating mode
by pressing this key several times with the
flap closed. The selected operating mode is
indicated by a symbol in the display. It becomes
effective if the setting was not changed for five
seconds.

Standby mode

Frost protection for the heating operation
is active. The standby symbol flashes, when
the heat pump manager is in standby
mode, and the operating mode cannot be
adjusted.
Application: During holidays.

Automatic mode
Heating according to time switch program.

Changeover between day temperature
and setback temperature. With this
operating mode, an additional symbol (sun
or moon) indicates in the display, whether
the heating circuit is currently in day or in
setback mode.

Constant day mode

The heating circuit is held at constant day
temperature.

Application: In low energy houses without

setback mode.

Constant setback mode

The heating circuit is held at constant
setback temperature.

Application: During weekends away.

4

1.5.2 Away key

This key activates the eco mode (away).
Press twice: The heating circuit switches to
setback mode for one hour. The selected
heating interruption is briefly displayed in
hours.
Press this key several times: the heating circuit
switches for the respective number of hours
to setback mode. If no key is then pressed for
approx. three seconds, the display returns to
the standard display and the active heating
interruption is displayed by the flashing moon
symbol.
You can scan the selected heating interruption
by pressing the “Away” key once at any time.
Pressing the operating mode key deactivates
the “Away” period and the moon symbol will
extinguish.

1.5.3 Help key

Pressing this key allows you to scan

sensor
temperatures of the heat pump or heat
pump system, such as outside temperature,
actual DHW temperature, actual return
temperature, actual room temperature and

the relative humidity.

After you press this key, the first display is
the outside temperature. Continuing to
press displays, in sequence, the actual DHW
temperature, the actual return temperature,
the maximum and minimum room
temperatures and the maximum and minimum
relative humidity. The standard display returns
after five seconds.
The MIN/MAX values for room temperature
and relative humidity are constantly updated
and stored.
If you hold down the key for four seconds, the
top of the display shows DELETE VALUES. All
MIN/MAX values will then be deleted.

Any fault in the heat pump causes an arrow
above the help key and the attention symbol
to flash. Pressing the help key displays that
fault. Three seconds later, the fault display
extinguishes and the standard display returns
again.

1.5.4 Room temperature

You can adjust the room temperature by
+/- 5K with the rotary selector. This set value
adjustment applies to the then current heating
time, not to the setback time.

Display (including all elements)

1 2 3

10

11

4

5

6

12 13 14915 16

7 8

1 Heating times for central
heating and DHW (black)
2 12-digit plain text display
3 Mixer mode
4 Heating mode
5

DHW mode
6 Cooling mode
7 Compressor runs
8 Booster in operation

Stage 1, 2 or 3
9 Fault message (flashing)
10 ‘BUS connection to the

WPMi established
11 WPMI in away mode
12 Standby mode
13 Automatic mode
14 Constant day mode
15 Constant setback mode
16 Day

C26_21_01_0012

5

1.5.5 Overview of system parameter (control level 2)

Select the required parameter with the rotary selector.
For adjustments to parameters, turn to page 6.

With the Room temp. parameter you can adjust the set

ROOM T

room temperature of the heating circuit for the day and

setback mode.

TEMPERATURES

HTG PROG

HTG CURVE

CONTRACTOR

The Temperatures parameter enables you to scan the
sensor temperatures of the heat pump or heat pump

system, comparing the actual with the set temperatures,

the relative humidity, etc.

In the Heating program parameter, you can adjust the
heating program.

In the Heating curve parameter, you can adjust the
heating curve. The room temperature will only remain

constant, irrespective of the outside temperature, if the
correct heating curve has been selected for the relevant
type of building. Selecting the correct heating curve is
therefore vitally important.

commissioning, you need to not only determine

During
the settings of control level 2, but also the system-specific
parameters. These parameters are adjusted at control
level 3 by your heating contractor, access to which is
protected by code.

.

6

Adjustments at control level 2 for users and contractors

The heating curve, room temperature

and heating program parameters are
not shown at the WPMi heat pump manager,
if the FEK is pre-selected for a specific
heating circuit.

Room temperature

With the Room temp. parameters you can
adjust the set room temperature for the day
and setback mode. Changing these parameters
results in a parallel offset of the heating curve.

Open the control flap

ROOM T

SET DAY

SET HIGHT

SET HIGHT

ROOM T

BACK

Temperatures

SET DAY

SET DAY

SET HIGHT

The Temperatures parameter enables you to
scan the following sensor temperatures of the
heat pump or heat pump system, comparing
the actual with the set temperatures,

relative humidity, etc.

– Outside temperature
– Actual room temperature
– Set room temperature
– Relative humidity
– Actual DHW temperature
– Set DHW temperature
– Actual heat pump return temperature
– System frost protection temperature

Note

No display, if the corresponding temperature
sensor is not connected.

.

the

7

Open the control flap

TEMPERATURES

OUTDOOR TEMP

BACK

At all other times, the heat pump operates
in setback mode. You will already have
selected the corresponding set values for day
and setback mode under the Room temp.
parameter.

Example:

Your heating system should operate daily
from Monday to Friday at two different times,
i.e. from 05:30 h until 08:30 h and from 14:00
h until 22:00 h. For the weekend, your heating
system should provide heat from 08:30 h until
21:00 h.

Open the control flap

HTG PROG

MON-FRI

TEMPERATURES

Heating program

Under this parameter you have the option of
setting up a heating program, i.e:
– for every day of the week (Mo, ..., Su
–

Monday to Friday (Mo - Fr)
– Saturday and Sunday (Sa - Su)
– the whole week (Mo - Su)

You can adjust three switching time pairs (I, II,
III) for each of these options.This determines
when and how often the heat pump system
should heat in day mode.

8

)

ON

OFF

ON

OFF

ON

SAT - SUN

ON

OFF

Heating curve

The Heating curve parameter allows you to
select a heating curve for heating circuit 1 or

2. Selecting the correct heating curve is vitally
important.
Note: Your contractor will have set up a
building and system-specific optimum heating
curve for the heating circuit. It relates to the
heat pump return temperature for heating
circuit 1 and to the mixer flow temperature for
heating circuit 2.

When adjusting the heating curve, the
calculated set return or flow temperature,
which is subject to the outside temperature
and the set room temperature, will be shown
at the top of the display.

Relative to +20 °C
Outside temperature

Relative to 0 °C
Outside temperature

Relative to -20 °C
Outside temperature

ON

ON

BACK

Relative to +20 °C
Outside temperature

Relative to 0 °C
Outside temperature

Relative to -20 °C
Outside temperature

26_21_01_0013

9

Open the control flap

1,5

2

1,2
1

0,6
0,4
0,2

2,5

3

2018161412

10

8

6

4

2

0

-2-4-6

-8

-10

-12

-14

-16

-18

-20

100

80

60

40

20

Außentemperatur [°C]

Heizkreis 2 WP-Vorlauftemperatur [°C]

Heizkreis 1 WP-Rücklauftemperatur [°C]

0,8

HTG CURVE

BACK

Heating curve diagram

One heating curve respectively can be adjusted for heating circuit 1 and heating circuit 2.
At the factory, heating curve 0.6 is set up for heating circuit 1 and heating curve 0.2 for
heating circuit 2. These heating curves relate to a set room temperature of 20 °C.

Heating circuit 1, HP return temperature [°C]

Heating circuit 2, HP flow temperature [°C]

10

Outside temperature [°C]

26_03_01_0077

2018161412

10

8

6

4

2

0

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

Außentemperatur [°C]

70

60

50

40

30

20

Tag-Betrieb

Absenk-Betrieb

Rücklauf- / Vorlauftemperatur [°C]

Adjustment of programmed changeover between day/setback mode

2018161412

10

8

6

4

2

0

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

Außentemperatur [°C]

Rücklauf- / Vorlauftemperatur [°C]

70

60

50

40

30

20

geänderte Heizkurve

The figure shows a standard heating curve with a slope of 0.8, relative to a set room
temperature for day mode of 20 °C. The lower curve represents the setback curve. For this,
a set room temperature for setback mode of 15 °C is used, in other words the heating curve
is subjected to a parallel offset.

Day operation

Setback operation

HP return temp. / flow temp. [°C]

Matching a heating curve to actual conditions

Example: During spring and autumn, the return or flow temperature of a heating system is
too low at an outside temperature between 5 and 15 °C, but is OK at outside temperatures
of ≤ 0 °C. This problem can be remedied by a parallel offset and a simultaneous reduction of
the heating curve. Prior to this adjustment, heating curve 1.0 was adjusted, relative to a set
room temperature of 20 °C. The dotted line indicates the modified heating curve at 0.83 and
a modified set room temperature at 23.2 °C.

HP return temp. / flow temp. [°C]

Modified heating curve

Outside temperature [°C]

26_03_01_0078

Outside temperature [°C]

26_03_01_0079

11

2 Installation instructions for contractors

2.1 Standard delivery

FEK Part no: 22 01 93

Dimensions: 147 x 97 x 33 (mm)

2.2 General information

The FEK is vitally important for area cooling,
e.g. underfloor heating systems, area heating
etc. Apart from the room temperature, it also
determines the relative humidity to prevent
condensation.

2.3 Installation

The correct function of the control module can
only be assured if the following are observed:

– Fitting on an internal wall (not in a recess)
– No cover through curtains or similar
– External heat influence is prevented

(e.g. sun, heating system, TV set)

– Prevention of direct draughts

(next to windows and doors)

For fitting, remove
the top part of the
casing by levering a
screwdriver above
the opening in the
bottom part.

Secure the bottom part on the wall and
connect the BUS cable.

A Fixing holes
B Cable entry (knock-out)
C Terminals

Position the top part
of the casing centrally
at the upper edge,
hook into place and
then pivot down onto
the base, using only

26_21_01_0018

light pressure, and
push home.

26_21_01_0017

12

26_21_01_0016

2.4 Specification

Supply voltage 12 V DC ± 15 %

Power consumption

EN 60529 IP 40

EN 60730 Protection class II

Clock backup > 10 hours

Permiss. ambient temp. during operation

Permiss. ambient temp. during storage

Room temperature sensor resistance
Tolerance in Ohm
Temperature tolerance

~ 25 mA

0 to 50 °C

- 20 to 60 °C

Test resistance NTC 5 k
± 1 % at 25 °C
± 0.2 K at 25 °C

Ω

2.5 FEK commissioning

Only approved contractors may commission
this control module and instruct the owner
in its use.

Not only the adjustments at control level 2
but also the system-specific parameters must
be determined as part of commissioning the
FEK. These parameters are adjusted at control
level 3, access to which is protected by code.
To reach this point, press
“Contractor” parameter, then
press . Check all parameters in sequence,

Note: Not all adjustments take immediate
effect. Some adjustments only become effective
in certain situations or after a delay.

Code 1 0 0 0

Enter the correct four-digit code to change
parameters at control level 3.
The factory-set code is 1 0 0 0.
After pressing (indicator illuminates),
by pressing
Pressing again confirms the value, then
the second digit of the code begins to flash.

you can adjust the first digit.

, until you reach the

Pressing enables the adjustment of the
second digit of the code, etc. The display
shows CODE OK when all four digits have
been entered correctly. This enables access
to control level 3. Closing and re-opening the
flap requires that the code is entered again.
Checking settings does not require the code to
be entered.

Language

Press and select the required language
with . Then confirm your selection by pressing

.

Contrast

Press

SELECT REM CON

You can predetermine with parameter
selection, to which heating circuit the remote
control applies.
As standard, HC1 is pre-selected. Accordingly,
the parameters room temp., heating curve and
heating program for heating circuit 1 are not
displayed at the WPMi.

and adjust the contrast with

or .

FE

13

FE Correction

This parameter enables the calibration of the
actual room temperature.

Room influence for FEK

Standard setting 5; adjustable from ----via
“0 to 20” dashes (----) in the display:
When the FEK control module is connected,
the room temperature sensor only serves
to capture and display the actual room
temperature; it has no influence on the actual
control. With any setting, you can adjust the
set room temperature for the heating circuit at
the FEK control module by ±5 K. This set value
adjustment applies for the then current heating
time, not for the setback time.
At the same time, setting “0 to 20” serves to
control the room temperature-dependent night
setback. This means, the heating circuit pump
is switched OFF at the point of changeover
from the heating into the setback phase. It
remains OFF, until the actual room temperature
first drops below the set room temperature.
Afterwards the system regulates in weather­compensated mode.
If you want the room temperature to be taken
into account, set the room temperature sensor
influence to > 0. The room sensor influence
has the same effect as the outside temperature
sensor has on the return temperature. Only
this effect is 1 to 20 times greater than the set
factor.

Room temperature-dependent return
temperature with weather compensation

With this type of control, a control cascade is
formed from weather-compensated and room
temperature-dependent return temperature
control. In other words, the weather­compensated return temperature control
pre-selects the return temperature, which is
corrected by the overlaid return temperature
control in accordance with the following
formula:

Because a substantial proportion of control
is already taken care of by the weather­compensated control, the room temperature
sensor influence K can be set lower than with a
purely room temperature control (
figure on page 15 indicates the control method
with the set factor K = 10 (room influence)
and a heating curve S = 1.2.

Room temperature control with weather­compensation

This type of control offers two substantial
benefits:
Incorrectly set heating curves are corrected
by the room temperature sensor influence
K, whilst the smaller factor K provides more
stable control.

However, observe the following for all control
units with room temperature sensor influence:
– The room temperature sensor must capture

the room temperature accurately.

– Open doors and windows severely

influence the control result.

– All radiator valves in the lead room must

always be fully open.

– The temperature inside the lead room is

decisive for the entire heating circuit.
Set the room temperature sensor influence to
> 0, if you want the room temperature to be
taken into account.

LCD test

Pressing once initiates a LCD test. All
display elements are displayed in sequence.

FEK software

Display of the current software issue.

K = 20). The

∆ϑR = (ϑ

14

Rset

− ϑ

Ractual

) * S * K

20

30

40

20

50

60

70

80

90

Vorlauftemperatur [°C]

15 16 1917 18 21 22 23 24 25

Raumtemperatur [°C]

0

10

20

30

40

0

50

60

70

80

90

Vorlauftemperatur [°C]

20

-20

Außentemperatur [°C]

0

10

15

10

5

-5

-10

-15

Heizkurve

S = 1,2



= S  K  (

- )

witterungsabhängiger Vorlaufsollwert bei 

A

= -10°C

witterungsabhängiger Vorlaufsollwert bei 

A

= 0°C

witterungsabhängiger Vorlaufsollwert bei 

A

= 10°C

Raumfühlereinfluss bei K = 10 und S = 1,2

und Regelabweichung +/- 2 K

R

R soll R ist

26_03_01_0098

S = 1.2

Heating curve

Outside temp. [°C]

Flow temp. [°C]

Weather-compensated set flow temperature ϑ = 0 °C

Weather-compensated set flow temperature ϑ = -10 °C

Weather-compensated set flow temperature ϑ = 10 °C

Room temp. [°C]

and control deviation ± 2 K

Room influence at K = 10 and S = 1.2

∆ϑRoom = S * K * (ϑSet Room - ϑSet Room )

Room influence

Flow temp. [°C]

15

www.stiebel-eltron.com

Stiebel Eltron International GmbH

Dr.-Stiebel-Str. 37603 Holzminden
Telefon [phone]

-0

Fax

055 31/702 - 479
E-Mail [e-mail]
Internet www.stiebel-eltron.com

Austria

Stiebel Eltron Ges.m.b.H.
Eferdinger Str. 73 A-4600 Wels
 072 42-47367-0 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.at

Belgique

Stiebel Eltron S.p.r.l./ b.v.b.a.
Rue Mitoyenne 897 B-4840 Welkenraedt
 087-88 1465 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.be

 

Stiebel Eltron spol. s r.o.
K Háju

o

m 946 C�Z-15500 Praha 5-Stodulky
 235 512 122 / 6111 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.cz

France

Stiebel Eltron SAS
7-9, rue des Selliers
BP 85107 F-57073 Metz-Cédex 3
 03-87-74 3888 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.fr

Great Britain

Exclusive Distributor:
Applied Energy Products Ltd.
Morley Way GB-Peterborough PE2 9JJ
 08709 000420 Fax [phone]
E-Mail [e-mail]
Internet www.applied-energy.com

Magyarország

Stiebel Eltron Kft.
Pacsirtamezo´´ u. 41 H-1036 Budapest
 012 50-6055 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.hu

Nederland

Stiebel Eltron Nederland B.V.
Daviottenweg 36
Postbus 2020 NL-5202 CA‘s-Her togenbosch
 073-6 2300 00 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.nl

Polska

Stiebel Eltron sp.z. o.o
ul. Instalatorów 9 PL-02-237 Warszawa
 022-8 4648 20 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.com.pl

Sverige

Stiebel Eltron AB
Friggagatan 5 SE-641 37 Katrineholm
 0150-487900 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.se

Switzerland

Stiebel Eltron AG
Netzibodenstr. 23 c CH-4133 Pratteln
 061-8 169333 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron.com

Thailand

Stiebel Eltron Asia Ltd.
469 Moo 2, Tambol Klong-Jik
Amphur Bangpa-In Ayutthaya 13160
 035-220088 Fax [phone]
E-Mail [e-mail]
Internet www.stiebeleltronasia.com

USA

Stiebel Eltron Inc.
17 West Street West Hatfield MA 01088
 04 13-247-3380 Fax [phone]
E-Mail [e-mail]
Internet www.stiebel-eltron-usa.com

Irrtum und technische Änderungenvorbehalten · Subject to errors

and technical changes! · Sous réserve d‘erreurs et de modifications

techniques!

· Onder voorbehoud vanvergissingen en technische

wijzigingen! · Salvo error o modificación técnica! · Rätt till misstag och
tekniska ändringar förbehålls! · Excepto erro ou alteração técnica ·

      · Omyly a

technické změny jsou vyhrazeny!

·    

  

· Возможность неточностей и

технических изменений не исключается

CAP 270783/34075/1/8043 · HD · Subject to modifications. · 6.6701.394-00