brummerhoop Lago 0321 Operating And Installation Instructions

Safety

Operating and installation instructions

Heating Controller Lago 01

Liability

We will not be held liable for damages resulting from non-observance
of the instructions and non-compliant use.

Safety instructions

Information that is relevant for safety is indicated in the instructions
as follows:

DANGER

Indicates potentially fatal situations.

WARNING

Indicates possible danger to life and limb.

Safety

Please read and keep in a safe place

Please read through these instructions carefully before
installing or operating. Following the installation, pass the instruc­tions on to the operator.
These instructions can also be found at www.docuthek.com.

Explanation of symbols

• , 1 ,  ,  ... = Action

▷ = Instruction

CAUTION

Indicates possible material damage.

All work and settings in the chapters “Expert” may only be carried
out by a qualified technician. Electrical interventions may only be
carried out by a qualified electrician. The heating system must be
disconnected from the power supply before any electrical work is
carried out on the unit.

Conversion

All technical changes are prohibited.

Transport

On receipt of the product, check that the delivery is complete. Report
any transport damage immediately.

Storage

Store the product in a dry place. Ambient temperature: see Techni­cal data.

Table of contents

Table of contents

Heating Controller Lago 01 .........................1

Safety.............................................1

Table of contents ...................................

Verify type of application............................. 6

Type designation codes ...............................6

Part designations ....................................6

Selector switch ...........................................6

Display .................................................7

User – Settings .....................................8

Set time and day of the week...........................8

Set the desired temperature............................ 8

Desired room temperature Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Setback temperature (desired room temperature Night) ............8

Desired hot water temperature ...............................8

Display actual temperatures ............................8

Set operating mode ..................................8

Standby/OFF ..........................................9

1 Automatic mode 1 .....................................9

2 Automatic mode 2 .....................................9

Day mode ............................................9

Night mode (reduced night mode) ..........................10

Summer mode ........................................10

Service ..............................................10

HO Holiday ..........................................10

Set heating program 1 ...............................11

Set heating program 2 ...............................11

Load factory settings (Reset) ..........................12

User – Set parameters ..............................1

List of parameters P01 to P19...............................13

Explanation of the parameters .........................14

P01 – P07 Heating program 2 (Monday to Sunday) ...............14

P08 Operating mode direct heating circuit (HC1)/

P13Operating mode mixer circuit (HC2) .......................14

P09 Heat slope direct heating circuit/

P14Heat slope mixer circuit ................................14

P10 Room sensor influence direct heating circuit/

P15 Room sensor influence mixer circuit.......................15

P11 Room sensor correction direct heating circuit/

P16 Room sensor correction mixer circuit ......................15

P18 Hot water according to program .........................15

P19 Indication of heating program at the lower margin of the display .16

User – Questions ..................................16

How do I switch to summer/winter time? .................16

How do I set the heating controller so that it gets warm

sooner in the morning? ..............................16

My heater does not get warm enough. What can I do? ......16

How do I set the heating system for holidays? .............17

How can I switch the heating system off during the summer? . 17
Is it possible to let the heating system run longer in the

evening for special occasions such as a party? ............17

How do I set the heating controller to save energy? .........17

Which room is allocated to which heating circuit? ..........17

My heating system is not running .......................17

2

Table of contents

Expert - Installation ................................18

Expert - Electrical connections ......................18

Define application...................................18

Connection diagram controller without socket .............21

Connection diagram controller with socket................22

Options ..........................................23

Maximum limiter .........................................23

Examples of installations .............................24

Heating system controller for heat source, mixed heating circuit and

hot water preparation .....................................24

Heating system controller for mixed heating circuit and hot water

preparation from a buffer storage tank.........................25

Heating system controller for direct heating circuit, mixed heating

circuit and hot water preparation .............................26

Controller for a mixed heating circuit as expansion for a heating

system controller .........................................27

Controller for a heat source in a cascade: Heating module .........28

Internal hot water preparation of the first heat source in the cascade

(hydraulic separation)......................................30

Expert – Set DIP switches ...........................1

Direct heating circuit or multifunction relay......................31

Assigning a remote control FBR2 to the direct heating circuit or

mixer circuit.............................................31

Set sensor resistance .....................................31

Expert – Set parameters ............................

List of parameters P20 to P99 .........................33

Explanation of the parameters .........................34

P20 Code no. input .......................................34

P21 code no. change .....................................34

P22 Outside temperature frost protection ......................34

P23 CAN bus ID mixer circuit (heating circuit address) ............34

P30 Maximum heat source temperature .......................34

P31 Heat source minimum temperature .......................34

P32 Warm-Up Temp .....................................34

P33 Minimum limit heat source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

P34 Dynamic switching hysteresis ...........................35

P35 Hysteresis time ......................................35

P36 Burner starts ........................................35

P37 Burner operating time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

P38 Address heating module (only for cascade operation) .........35

P50 DHW Relief (charging pump lock) ........................35

P51 Parallel pump operation ...............................35

P52 Antilegion function ....................................36

P53 Temperature increase during hot water preparation ..........36

P60 Maximum flow temperature direct heating circuit ............36

P61 Minimum flow temperature direct heating circuit .............36

P69 Additional mixer functions (P77 – 79) ......................36

P70 Maximum flow temperature mixer circuit ...................36

P71 Minimum flow temperature mixer circuit ...................36

P72 Mixer Dynamic OPEN (when opening)/

P73 Mixer Dynamic CLOSED (when closing) ....................36

74 T-Flow Cooling (flow temperature Cooling) ...................37

P75 T-Room Cooling (desired room temperature) ................37

P76 Min TO Cooling (Minimum outside temperature for cooling) .....37

P77 Mixer scan time ......................................38

P78 Mixer operating time limit ..............................38

P79 Mixer start seconds ...................................39

P80 MF Relay function ....................................39

P81 Switching temperature of the multifunction relay .............40

P82 Multifunction relay hysteresis ............................40

P97 PC enable (0000 = disabled) ............................40

P98 Relay Test ..........................................40

P99 Software version and index (63.XX) .......................40

Expert – Checklist for commissioning .................41

3

Table of contents

Service...........................................4

STL Test .........................................42

Accessories ......................................4

Operating module Merlin BM, BM8, or remote control Lago

FB ..............................................43

Merlin BM ..............................................43

Lago FB ...............................................43

PC Adapter .......................................43

CoCo PC active..........................................44

CoCo PC mobile .........................................44

Remote control and room sensor FBR2 ................44

Room sensor RFB

Outside sensor AF/AFS .................................45

Boiler sensor KF/KFS

Storage sensor SPF/SPFS ...............................45

Flow sensor VF/VFAS

Sensor values ...........................................46

................................44

....................................45

Help with faults....................................47

Technical data ....................................49

Glossary .........................................50

Flow and return flow temperature.......................50

Desired and actual temperature ........................50

Setback temperature ................................50

Heat source .......................................50

Circulation pump ...................................50

Direct heating circuit.................................50

Mixed heating circuit / Mixer circuit .....................50

Heating time.......................................50

Header pump...................................... 51

Feed pump .......................................51

Legionella.........................................51

4

Certification ......................................51

Declaration of conformity .............................51

Eurasian Customs Union .............................51

Heating circuit allocation ...........................5

For the installation expert .............................52

Contact ..........................................5

Table of contents

5

Verify type of application

Verify type of application

Heating controller to be used as a
– heating system controller,
– mixer extension or
– as a controller for a heat source in a cascade,
for further explanation see page 18 (Expert - Electrical connections).
The heating controller regulates two independent heating circuits:
one indirect heating circuit and one mixer circuit.
The function is only guaranteed within the specified limits, see page
49 (Technical data).
Any other use will be deemed improper use.

Type designation codes

Code Description

Lago Heating controller
0 On//Off boiler control

 Mixer circuit and hot water preparation

 Temperature-controlled multifunction relay

1 CAN bus communication

Part designations

5

Mode

Time

OK⇒Mo–Su

Th Fr Sa So

Mo Tu We

1

4

>1s

Mo–Fr

1/

1

Sa–Su

OK

3

1 Selector switch
 Rotary knob

for changing the set values and displaying the temperatures

 OK button

for displaying the desired temperature of the heat source, for
confirming settings, and the for testing the Safety Temperature
Limiter

4 Assembly holder of the controller
5 Cable feed-throughs

Selector switch

Standard

Mode Operating mode selection

°C

°C
°C

Desired room temperature Day (for both heating
circuits)
Setback temperature (for both heating circuits)

Desired hot water temperature
Sa – Su Heating program 1 from Saturday to Sunday
Mo – Fr Heating program 1 from Monday to Friday

Parameter setting for User and Expert

Time Setting the time and the day of the week

1

°C

°C

4

°C

1

2

6

Verify type of application

Display

Mo Tu We Th Fr Sa Su

1
2

3
4
5
6
7

1 2

1/

1 Days Monday – Sunday underlined
 Communication to devices on the CAN bus (such as Lago FB,

BM8, Merlin BM)

 Status indications:

Burner,

Mixer circuit pump,
Hot water enabled,
Storage charging pump,
Mixer open,
Mixer closed,

Room temperature,

/ 1 Multifunction relay /Pump direct heating circuit

4 Heat source temperature (When used as a mixer expansion,

"--" is displayed.)

5 Time

6 Operating modes:

Operational readiness/OFF (Heating and hot water

preparation OFF, frost protection operation only)

1 Automatic mode 1 (Heating according to heating program

1, hot water according to parameter 18)

2 Automatic mode 2 (Heating according to heating program

2, hot water according to parameter 18)

Day mode (24 hour heating with desired room temperature

Day, hot water according to parameter 18)

Night mode (24 hour heating with setback temperature, hot

water according to parameter 18)

Summer mode (Heating OFF, hot water according to

parameter 18)

Service (Heat source controls to maximum heat source

temperature.)

Holiday mode (During holidays the rooms are heated to 15

°C, after the holidays the rooms are automatically heated
according to heating program again.)

7 Display of the heating times

7

User – Settings

User – Settings

Set time and day of the week

1 Turn selector switch to Time.
 Press the OK button.

▷ Display flashes.

 Set time with rotary knob.
4 Press the OK button.
5 Set day of the week with rotary knob.
6 Press the OK button.

▷ The new time and the day of the week is displayed.

7 Turn selector switch back to .

▷

To cancel the settings without saving, turn the selector switch
back to at any time.

Set the desired temperature

Desired room temperature Day

▷ Active during heating times

1 Turn selector switch to °C .

Setback temperature (desired room temperature Night)

▷ Active between heating times

1 Turn selector switch to °C

Desired hot water temperature
1 Turn selector switch to °C

All three temperatures
 Press the OK button.

▷ Display flashes.

 Set day of the desired temperature with rotary knob.

.

.

4 Press the OK button.

▷ The new desired temperature is displayed.

5 Turn selector switch back to .

Display actual temperatures

1 Turn selector switch to .
 Use the rotary knob to set one of the following temperature indi-

cations:

H1 to H8
+

AF

*) Hot water temperature

FF *)

* The desired temperature is displayed when the OK button is pressed.

▷ If a sensor is not connected, the display will show -- --.
▷

Room temperature for up to 8 heating circuits

Outside temperature
Heat source and concurrently flow temperature of the

*)

direct heating circuits (1st HC)

*) Flow temperature of the mixer circuit (2ndHC)

Multifunction sensor temperature

The display reverts to the standard indication after a few seconds
without action.

Set operating mode

The operating mode determines how the heating controller works.
Whether the heating system is to be controlled automatically or manu­ally, during a party for example. Or how should the heating system
be controlled during longer periods of absence such as holidays?

The heating controller leaves the factory with the setting

▷

Standby/OFF. The operating mode must be changed for normal
operation.

1 Turn selector switch to “Mode”.
 Press the OK button.

8

User – Settings

▷ Display flashes.

 Set the operating mode using the rotary knob.
4 Press OK after you have selected your setting.

▷ The new operating mode is displayed.

5 Turn selector switch back to .

▷

All operating modes have an effect on the heat source and on
both internal heating circuits of the controller. A different mode
can be assigned to each heating circuit individually, see page 12
(User – Set parameters).

▷ If the controller is used as a heating system controller, all heating

circuits of the system are deactivated for operating modes and

. This only applies to the associated heating circuit when used

as a mixer expansion.

Example: Installation with three mixed heating circuits and
hot water preparation

Lago #1

1

#1

Lago 0321

off off
on on
off

#2

Lago 0321

#2

1

1

off
off
off

#3

Lago 0321

#3

off

1

on

1

offon

1

Lago#1 controls the first heating circuit and hot water. Lago #2
controls the second heating circuit and Lago #3 the third. If mode

was selected for Lago #1, the entire system will be switched off,

regardless of the settings for the other controllers.

You can set the following operating modes

Standby/OFF

Heating and hot water preparation are deactivated. Only the frost
protection function remains active.

1 Automatic mode 1

Heating occurs according to heating program 1: Heating occurs at
identical times for Monday – Friday, as well as Saturday – Sunday. Hot
water according to parameter 18, see page 11 (Set heating program 1).

 Automatic mode 

Heating occurs according to heating program 2: You can set Individual
heating times for each day. Hot water according to parameter 18,
see page 11 (Set heating program 2).

▷

Toggling between Automatic mode 1 and 2 can be useful for shift
workers. The times do not need to be entered for each shift - they
only need to be switched over.

Day mode

Heating occurs for 24 hours to desired room temperature Day. Hot
water according to parameter 18, see page 8 (Set the desired tem­perature).
This setting is required for events such as a party, when the heat­ing period in automatic mode will not be sufficient. Do not forget to
switch back to automatic mode once the party is over.

9

User – Settings

S

1/

Th Fr Sa So

1/

1

°C

Mode

Time

OK⇒Mo–Su

°C

°C

1

Sa–Su

1

Mo–Fr

°C

Mode

Time

°C

°C

1

Sa–Su

1

Mo–Fr

1/

Th Fr Sa So

1/

1

°C

Mode

Time

OK⇒Mo–Su

°C

°C

1

Sa–Su

1

Mo–Fr

Night mode (reduced night mode)

Heating is reduced to the setback temperature for 24 hours.
Hot water according to parameter 18, see page 15 (P18 Hot water
according to program).
This setting can be used to save energy; in exceptional cases when
no-one is going to be home during the day over a longer period of
time for example. Do not forget to switch back to automatic mode
once the party is over.

Summer mode

The heating system is switched off to save energy. Parameter 18 for
hot water must be set to 1, 2 or 4, see page 12 (User – Set parameters).

Service

The heat source heats to the max. temperature set in parameter

30. As soon as the temperature of 65 °C has been reached, the
consumers regulate to their max. flow temperature for heat removal.
Automatic reset after 15min.

HO Holiday

During holidays the room temperature is regulated to 15 °C.

▷ If parameter 18 is set to 3, hot water preparation is deactivated,

see page 15 (P18 Hot water according to program). If parameter
18 is set to 0, 1, 2 or 4, the HO Holiday mode has no effect
on the hot water preparation.

Example: Setting

You leave on Monday and return Thursday evening. Before leaving
on Monday program:

HO Holiday operating mode

Mode

Time

Mo–Su

Mo–Fr

°C

1

a–Su

Mo Tu We Th Fr Sa So

1

OK

>1s

Mo Tu We Th Fr Sa So

OK

>1s

1 Turn selector switch to „Mode“.

°C

°C

▷ The display shows the current operating mode

(e.g. automatic mode 1)

 Press the OK button.

▷ Display flashes.

 Rotate the rotary knob clockwise until HO 4

flashes in the display.

▷

HO 4 indicates that 4 absent days have been pro­grammed (in this example Mon, Tue, Wed and
Thu).

4 Press the OK button.

▷ The display shows HO 4.

10

User – Settings

°C

Mode

Time

°C

°C

1

Sa–Su

1

Mo–Fr

Example: Indication of the heating times for heating
program 1

Heating is to occur from Monday to Friday respectively between 6:00
and 8:00 in the morning, from 11:30 to 13:00 at lunchtime and from
18:00 to 22:00 in the evening.

Mo Tu We Th Fr Sa So

⇒Mo–Su

Mo–Fr

Mode

Time

1

Sa–Su

5 Turn selector switch back to .

▷ The holiday function starts immediately and ends

°C

on Thursday at 24:00. On Friday (day 5) heating

°C

°C

mode reverts to the original mode.

▷

Should you return from your holiday before this
time, you will need to set the original operating
mode again (e.g. automatic mode 1).

Set heating program 1

Heating program 1 is assigned to automatic mode 1. It is used
to define the heating times for the working week (Mo – Fr) and the
weekend (Sa – Su). You can set three heating times per day.

▷ During heating times the controller heats to desired temperature,

between heating times to setback temperature.

1 Rotate selector switch to Mo – Fr 1 or Sa – Su 1.
 Press the OK button.

▷ The start time of the first heating time flashes.

 Use the rotary knob to select the start time.
4 Press the OK button.

▷ The end of the first heating time flashes.

7 Finally, turn the selector switch back to .

▷

The heating program 1 has been set. In order to apply it, set
the operating mode to “ 1 Automatic Mode 1” , see page 8 (Set
operating mode).

▷

To cancel the process without saving, turn the selector switch
back to at any time.

▷ Factory setting:

Mo – Fr: 6:00 to 22:00
Sa – Su: 7:00 to 23:00

1

0 6 12 18 24

1/

5 Use the rotary knob to select the end time.
6 Press the OK button.

▷ Continue with step 3 to set the second and third heating time.
▷ The heating times will only be saved once you have entered all

three heating times or have set the start time to “----”.

▷

If you want to delete an existing heating time, use the rotary knob
to set the start or end time to “----”.

Set heating program 

Heating program 2 is assigned to automatic mode 2. It can be
used to set the heating times for each individual day. You can set
three heating times per day.

▷ During heating times the controller heats to desired temperature,

between heating times to desired temperature Night.

1 Turn selector switch to (Parameter setting).

▷ The display shows .

11

User – Set parameters

 Turn the rotary knob one step in clockwise direction.

▷ The display shows 01 (Monday).

 Press the OK button.

▷ The start time of the first heating time flashes.

4 Use the rotary knob to select the start time.
5 Press the OK button.

▷ The end of the first heating time flashes.

6 Use the rotary knob to select the end time.
7 Press the OK button.

▷ Continue with step 3 to set the second and third heating time.
▷ The heating times will only be saved once you have entered all

three heating times or have set the start time to “----”.

▷

If you want to delete an existing heating time, use the rotary knob
to set the start or end time to “----”.

Example: see page 11 (Set heating program 1).

8 Turn the rotary knob clockwise to the next day: 02 = Tuesday to

07 = Sunday.

▷ Continue with step 3.

9 Finally, turn the selector switch back to .

▷

The heating program 2 has been set. In order to apply it, set
the operating mode to “ 2 Automatic Mode 2”, see page 8 (Set
operating mode).

▷

To cancel the process without saving, turn the selector switch
back to at any time.

▷ Factory setting:

Mo – Fr: 6:00 to 8:00, 16:00 to 22:00
Sa – Su: 7:00 to 23:00

Load factory settings (Reset)

▷ All personal settings will be lost.

1 Take a note of all the settings you have made in these instructions.
 Switch off mains.
 When switching the mains back on, keep the OK button pressed

until EE P appears in the display.

▷ The factory settings have been loaded.

User – Set parameters

As for heating program 2 you can change further parameters to
adapt the heating system to your requirements.
1 Turn selector switch to (Parameter setting).

▷ The display shows .

 Turn the rotary knob clockwise until the parameter you want

to change appears in the left-hand side of the display: 08 to 19
(operating mode direct heating circuit until to display heating
program).

 Press the OK button.

▷ Display flashes.

4 Use the rotary knob to set the desired value.
5 Press the OK button to confirm.
6 After you have made the setting, continue with step 2 if you want

to change further parameters, or turn the selector switch back to

.

▷

The table – see page 13 (List of parameters P01 to P19) – shows the
possible settings (including the parameters for heating program 2).

▷

The heating controller will only display those parameters for which
there are sensors connected.

12

User – Set parameters

List of parameters P01 to P19

P-No.

Parameter Setting range Factory setting Own values
01 Heating program 2 for Monday 00:00 – 24:00
02 Heating program 2 for Tuesday 00:00 – 24:00
03 Heating program 2 for Wednesday 00:00 – 24:00
04 Heating program 2 for Thursday 00:00 – 24:00
05 Heating program 2 for Friday 00:00 – 24:00
06 Heating program 2 for Saturday 00:00 – 24:00
07 Heating program 2 for Sunday 00:00 – 24:00
08 Operating mode direct heating circuit (HC1) ----,
09 Heat slope direct heating circuit 0.20 – 3.00 1,20

Room sensor influence
10

direct heating circuit

Room sensor correction
11

direct heating circuit
13 Operating mode mixer circuit (HC2) ----,

14 Heat slope mixer circuit 0.20 – 3.00

With underfloor heating set parameter 14 < 1, with radiator heating > 1.

Room sensor influence
15

Mixer circuit

Room sensor correction
16

Mixer circuit

18 Hot water according to program

Indication of heating program at the lower margin of the
19

display

, 1, 2, , ----

OFF, 0 – 20 10

-5 to +5 K 0

, 1, 2, , ----

OFF, 0 – 20 10

-5 to +5 K 0

0 = Off
1 = Heating program 1
2 = Heating program 2
3 = 1 hour before heating
4 = 24 hours hot water

0 = for direct heating circuit
1 = for mixed heating circuit

06:00 – 08:00
16:00 – 22:00

07:00 – 23:00

1.20

1

0

13

User – Set parameters

Explanation of the parameters

P01 – P07 Heating program  (Monday to Sunday)

Heating program 2 is assigned to Automatic mode 2, see page 11
(Set heating program 2).

P08 Operating mode direct heating circuit (HC1)/
P1Operating mode mixer circuit (HC)

P08 = ----: The direct heating circuit operating mode corresponds
to the value in chapter “Set operating mode”.
P13 = ----: The mixer circuit operating mode corresponds to the
value in chapter “Set operating mode”.
A separate and different operating mode can be selected for both
circuits individually.
1 = Standby/OFF
2 = 1 Automatic mode 1
3 = 2 Automatic mode 2
4 = Day mode
5 = Night mode (reduced night mode)
Exception: The general operating modes Standby/OFF and
Summer mode have a reducing effect on the entire system. All
heating circuits are switched off.

Example: Heating by means of radiators and underfloor
heating

In your house you have heaters that supply the direct heating circuit
with water, and underfloor heating that heats the mixer circuit. Be­cause underfloor heating acts slower than a radiator, the underfloor
heating is to be switched on and off beforehand.
Set the general operating mode “
8 (Set operating mode).

1 Automatic mode 1”, see page

In order to use different heating times for the mixer circuit, set pa­rameter 13 to
Now you can use Heating program 1 to set the heating times for
your radiators and Heating program 2 to set different times for the
floor heating, see page 11 (Set heating program 1) and page 11 (Set
heating program 2).
If the floor heating is meant to be switched off, set parameter 13 to

= Standby/OFF.

P09 Heat slope direct heating circuit/
P14Heat slope mixer circuit

Selecting the correct heat slope saves energy because the heat
sources only heat to the point required by the respective outside
temperature.
The heat slope specifies the number of °C by which the flow tem­perature changes when the outside temperature rises or drops.

▷

Before you select the heat slope, set the room temperature to the
desired value, see page 8 (Set the desired temperature).

▷

Ideally, the heat slope is set when the outside temperature is below
5 °C. Changes to the heat slope setting must be applied in small
steps and long intervals (at least 5 – 6 hours between steps). The
system must be allowed to adjust to the new value after each
change to the heat slope.

▷

Select the heat slope so that the desired room temperature is
achieved with the thermostat valves fully opened, and doors and
windows closed.

▷

Increase the heat slope if the desired room temperature is not
reached in combination with low outside temperatures.

▷

If the desired room temperature is not reached in combination with
high outside temperatures, increase the desired room temperature.

• Now change the heat slope.

2 = Automatic mode 2.

14

User – Set parameters

3

▷ Typical values:

floor heating: 0.4 to 0.8
Radiators: 1.0 to 1.5

100

80

Flow temperature [°C]

60

40

20

20 16 12 8 4 0 -4 -8 -16 -20

Outside temperature [°C]

2,5

2

1,5

1,2

1

0,8

0,6

0,4

0,2

P10 Room sensor influence direct heating circuit/
P15 Room sensor influence mixer circuit

Only active if a room sensor is connected or an FBR2 remote control
with integrated room sensor is used. It is possible to adjust the influ­ence of the room sensor on the control process.

▷

The higher the set value the greater the influence of the room

sensor on the calculated flow temperature.
P10/15 = OFF: purely weather-guided control
P10/15 = 0: purely weather-guided control
P10/15 = 20: pure room temperature control

Within the range 0 – 20 the heating circuit pump operates up to the
next heating time if there is a heating requirement during the period
of reduced temperature Night (e.g. frost protection of when the
temperature drops below the setback temperature. This prevents
the rooms from becoming too cool.

Example: P10/15 = 5

With this setting the desired temperature of the heat source is in­creased by 5K when the room temperature drops below the desired
room temperature by 1K.

P11 Room sensor correction direct heating circuit/ P16 Room sensor correction mixer circuit

Only active if a room sensor is connected or an FBR2 remote control
with integrated room sensor is used. This setting can be used to cor­rect measurement errors of the connected room sensor, e.g. when
the room sensor is influenced by incorrect positioning.
Setting range: P11/16 = -5 to +5 K.

Example: Room sensor correction direct heating circuit

Your room sensor measures 20 °C. A reference thermometer, how­ever, determines 22 °C. Now set parameter 11 = 2 so that the value
2 K is added to the measured value.

P18 Hot water according to program

This parameter can be used to define the heating times for hot water.
P18 = 0: Off (no hot water preparation)
P18 = 1: hot water in line with heating program 1
P18 = 2: hot water in line with heating program 2
P18 = 3: 1 hour before the heating times of automatic mode 1 or 2.
(The desired automatic mode is set via the operating mode.
With activated HO Holiday mode the hot water preparation is
not switched on.)

15

User – Questions

With the mode “Summer mode” parameter 18 must be set to 1,
2, or 4.
P18 = 4: 24 hours hot water

Example: P18 = 

If “Automatic mode 1” was selected as the operating mode, the
heating controller will always switch on the hot water one hour before
switching on the heating. If HO Holiday mode is activated, the
hot water is not switched on.

P19 Indication of heating program at the lower margin of the display

P19 = 0: The heating program for the direct heating circuit is dis­played.
P19 = 1: The heating program for the mixed heating circuit is dis­played.

User – Questions

How do I switch to summer/winter time?

To switch from summer to winter time and vice verse you need to
reset the time, see page 8 (Set time and day of the week).

How do I set the heating controller so that it gets warm sooner in the morning?

There are two heating programs to set the heating times.
Heating program 1 for setting the heating times Mo – Fr (working
week) and Sa – Su (weekend) for the week as a whole,
Heating program 2 for setting the heating times for each day of the
week Mo, Tu, We, Th, Fr, Sa and Su.
Heating program 1 in operating mode 1 is assigned to automatic

mode 1.
Heating program 2 in operating mode 2 is assigned to automatic

mode 2.
First select automatic mode 1 or 2, see page 8 (Set operating
mode).
Then adjust the associated heating program to suit your needs, see
page 11 (Set heating program 1) or 11 (Set heating program 2).

My heater does not get warm enough. What can I do?

You have two options.
First increase the desired room temperature Day, see page 8 (Set
the desired temperature).
Wait for a few hours to give the heating system time to respond to
the new setting.

16

User – Questions

Should the room(s) still not get warm enough, you can increase
the heat slope for the direct heating circuit or the mixer cir­cuit, see page 14 (P09 Heat slope direct heating circuit/
P14Heat slope mixer circuit).
Should this measure not be sufficient, see page 47 (Help with faults)
and contact your heating engineer.

How do I set the heating system for holidays?

If you want to go away for a number of days, you
can set the heating controller to the operating mode
“ HOHoliday”. The heating system will revert to automatic mode at
the end of the holiday so that it will be warm when you come home,
see page 8 (Set operating mode).

How can I switch the heating system off during the summer?

In summer you should set the heating controller to the operating
mode “Summer mode”. This mode deactivates heating and the
system is only used for hot water, see page 8 (Set operating mode).

Is it possible to let the heating system run longer in the evening for special occasions such as a party?

For this purpose select the operating mode “ Day mode”, see page
8 (Set operating mode).

How do I set the heating controller to save energy?

▷

Set the desired room temperature only as high as absolutely
necessary. The energy consumption is increased by around 6%
for every degree, see page 8 (Set the desired temperature).

▷

Set your heating program so that it switches the heating off at
night or at times when no-one is home.

▷ Only open you windows briefly to let in fresh air. Avoid tilted win-

dows over longer periods.

Which room is allocated to which heating circuit?

Please contact your heating engineer to answer this question. You
will find a table on the last page of these instructions where these
allocations can be entered.

My heating system is not running

Check the selector switch position. The selector switch must be
set to .
Check the operating mode. The display must indicate 1 for Automatic
mode 1, or 2 for Automatic mode 2, see page 8 (Set operating mode).

17

Expert - Electrical connections

Expert - Installation

CAUTION

The minimum distance from surrounding heat sources is to be

chosen so that the permitted ambient temperature will not be
exceeded during operation, see page 49 (Technical data).

21a 1b

3

Top

B

A

A

B

A

A

B

A B

95 75

57

Ø 3,5

60

Expert - Electrical connections

WARNING

Possible life-endangering electrical shock! Switch the power off to
electrical cables before working on power-carrying parts!

CAUTION

For fixed devices, an isolating mechanism must be installed for
shutting off from the network, in accordance with the installation
guidelines and EN 60335, e.g. with a switch.

The insulation for line conductors is to protected against damage

by overheating, e.g. insulating sleeve.

Define application

The Lago 0321 can be used for three different applications:

as a heating system controller, as a mixer expansion, or as a controller
for a heat source (boiler control) in a cascade.

The application is determined automatically by connecting certain

sensors and on setting specific parameters.

18

Expert - Electrical connections

Heating system controller

Lago 0321

VF

1

KF

SPF

2

Connect heat source sensor (KF/KFS), flow sensor (VF/VFAS) and
storage sensor (SPF/SPFS),
Parameter 38 = “----” (no heating module address)

The following functions are now active:

▷

control of a single-stage heat source or an alternative heat removal

from a buffer storage tank,

▷ control of a hot water preparation system,
▷ control of a mixed heating circuit,
▷

control of a direct heating circuit or, alternatively, an additional

function with multifunction relay, such as a circulation pump, return

flow temperature increase or header pump. (For this purpose,

set the DIP switches and parameters 80 – 82. Additional sensors

may be required.)

Controller for a mixed heating circuit as expansion for a
heating system controller

Lago 0321

VF

This application is automatically activated if only one flow sensor
(VF/VFAS) is connected.
Set parameter 23 to heating circuit address (2 – 15).

The following functions are now active:

▷

Control of an additional mixed heating circuit (expansion for a
heating system controller), e.g. in a multi-family unit.

▷

Control of an additional function with multifunction relay, e.g.
circulation pump or return flow booster. (For this purpose, set

the DIP switches and parameters 80 – 82.)

The following functions can not be used:

▷ Header pump
▷ Heat source pump

19

Expert - Electrical connections

Controller for a heat source in a cascade: Heating module

CAN-Bus

#1
Lago 0321#2Lago 0321

Merlin

KF

KF

VF

SPF

This application is automatically activated as soon as you connect
a heat source sensor (KF/KFS) and set parameter 38 = 1 – 8 (heat­ing module address).

The following functions are now active:

▷ Control of a heat source in a cascade,
▷

Control of an additional function with multifunction relay, e.g. heat
source pump or return flow booster.

▷ A cascade manager, such as Merlin 5064, is required for heating

circuit and hot water control.

20

11

N

12
13
14
15

1
2L1
3
4
5
6
7
8

Sensor

230 V

L1’

1/

H
L
–
+

CAN-BUS

1

2

2

M

Connection diagram controller without socket

Sensor

H

11
12
13
14
15
16
17
18
19
20
21
22

L
–
+
1
2

3

SPF
RF
KF
VF 2
AF

CAN-BUS

FBR2

GND

ON

1 2 3 4 5 6

N

= OFF

L1’

= ON

2

T1
T2

Expert - Electrical connections

▷

Use solid lines or flexible lines with wire
end sleeves for connections (230 V).

▷

230 V

1
2L1
3

1/

4

2

5
6
7

M

8
9

10

Route CAN bus lines and sensor lines
separately from power lines.

▷ Never mix 1 kΩ and 5 kΩ sensors.
▷

Only connect sensors required for the
system.

▷

Connect a bridge between terminal 16
and GND bus terminal. If the bridge be­tween terminal 16 and GND is omitted,
the sensor values will not be displayed.

▷ Set bridge and reset heating controller.

2

16

17
18
19

SPF
RF

FBR2

3

GND

SELV, safety extra low voltage

~230 V, switching capacity of the relays 2(2) A, ~250 V

11 – 14 CAN-BUS 1 Neutral conductor mains
15 – 17 FBR2, alternatively: 2 Mains voltage heating controller L1
15 – 16 Room thermostat 3 Mains voltage for the outputs L1‘

16 – 17 Phone switch 4

Pump heating circuit 1 or
multifunction relays

18 Storage sensor 5 Pump heating circuit 2

19

20 Boiler sensor 7 Mixer Open
21 Flow sensor 8 Mixer Close
22 Outdoor sensor 9 – 10 Burner electrically isolated

Room sensor or multifunction sen­sor

▷ Use solid lines of flexible lines with wire end sleeves for connections (230 V).
▷ Route bus lines and sensor lines separately from power lines.
▷ Never mix 1 kΩ and 5 kΩ sensors.

6 Storage charging pump

21

Expert - Electrical connections

Sensor

11
12
13
14
15

H

L
–

+

CAN-BUS

1

Top

Connection diagram controller with socket

SPF

RF

KF
VF
AF

H

L
–

CAN-BUSFBR2

+
1
2
3

Sensor

11
12
13
14
15
16
17
18
19
20
21

2

22

230 V

1
2
3
4
5

N

L1
L1’

1/

2

N

Top

6
7
8
9
10

~230 V, switching capacity of the relays 2(2) A, ~250 V

1 Neutral conductor mains

2

M

GND

T1
T2

SELV, safety extra low voltage

11 – 14

CAN-BUS

2 Mains voltage heating controller L1 15 – 17 FBR2, alternatively:

15 – 16

3 Mains voltage for the outputs L1‘

Pump heating circuit 1 or

4

multifunction relays

Room thermostat

16 – 17 Phone switch

5 Pump heating circuit 2 18 Storage sensor
6 Storage charging pump 19 Room sensor or multifunction sensor

7 Mixer Open 20 Boiler sensor

8 Mixer Close 21 Flow sensor
9 – 10 Burner electrically isolated 22 Outdoor sensor

▷

Use solid lines or flexible lines with wire
end sleeves for connections (230 V).

▷

Route CAN bus lines and sensor lines
separately from power lines.

▷ Never mix 1 kΩ and 5 kΩ sensors.
▷

Only connect sensors required for the
system.

▷

Connect a bridge between terminal 16
and GND bus terminal. If the bridge be­tween terminal 16 and GND is omitted,
the sensor values will not be displayed.

▷ Set bridge and reset heating controller.

2

16

FBR2

3

17

GND

SPF

RF

18
19

22

Options

N

1
2
3

230 V

Top

Provided no separate regulations for protecting the relay apply, a
bridge to supply the relay must be connected between terminals
2 and 3.

Expert - Electrical connections

230 V

1

2
3

Maximum limiter

4

5

6

If a maximum limiter is required for the mixed heating circuit, e.g. in
combination with underfloor heating, the limiter must be connected
between terminal 5 and the heating circuit pump.

N

L1

ϑ

2

N

23

Expert - Electrical connections

Examples of installations

Heating system controller for heat source, mixed heating circuit and hot water preparation

Requirements

In the condition as supplied to the customer the heating controller can
be used for this system, provided the required sensors are connected.

AF

KF

Sensors, see page 4 (Accessories)

▷ AF/AFS external sensor: only with atmospheric control
▷ KF/KFS boiler sensor: in combination with heat source control
▷ VF/VFAS flow sensor: only with mixed heating circuit
▷ SPF/SPFS storage sensor.

22

20

Lago 01

T2T1

867109

21

2

VF

2

185

SPF

▷ FBR2 Remote control with room sensor,
▷ RFB Room sensor on terminals 15+16,
▷ Lago FB, BM8 or Merlin BM operating module, connected via a

CAN-BUS (Terminals 11 – 14).

Set parameters

P14, P18, P19 and P70

The factory settings apply for all other parameters, see page 32

(Expert – Set parameters).

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

Room control

The room temperature can be detected and controlled as follows:

24

Expert - Electrical connections

Heating system controller for mixed heating circuit and hot water preparation from a buffer storage tank

Requirements

In the condition as supplied to the customer the controller can be
used for this system, provided the required sensors are connected.

AF

KF

Lago 01

22

20

87 5

21 18

2

VF

2

2

2

6

SPF

Sensors, see page 4 (Accessories)

▷ AF/AFS external sensor: only with atmospheric control
▷

KF/KFS boiler sensor: If the KF/KFS sensor is connected, the

heating circuit pump and the storage charging pump will only

be switched on when the Warm Up Temperature is exceeded at

this sensor. The storage charging pump is only activated when

the heat source temperature (KF/KFS) is also higher than the hot

water temperature (SPF/SPFS).

If no heat source sensor (KF/KFS) is installed, the heating controller

▷

will show “--” for nothing to display.

▷ VF/VFAS flow sensor: only with mixed heating circuit
▷ SPF/SPFS storage sensor

Room control

The room temperature can be detected and controlled as follows:

▷ FBR2 Remote control with room sensor,

Set parameters

P14, P18, P19, P32, P50, P52, P53 and P70
The factory settings apply for all other parameters, see page 32 (Expert
– Set parameters) for explanations.

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

Additional functions with multifunction relay

The multifunction relay (terminal 4) can be used for additional functions.

▷ DIP switch 4 = “OFF” (Multifunction relay activated)

25

Expert - Electrical connections

Circulation pump,
parameters 80
= 02

SPF

Pump heat source

1, P80 = 05

KF

Return flow
booster, P80 = 24

KF

Set P81 and P82
according to boiler
manufacturer’s
specifications

Heating system controller for direct heating circuit, mixed heating circuit and hot water preparation

Requirements

▷ DIP switch 4 = “ON” (direct heating circuit)
▷ Set parameter 23 = Address 2 – 15 for the mixed heating circuit.

KF

AF

22
20

T2T1

4

109

1

Lago 01

587

21 18

2

VF

2

2

6

SPF

Sensors, see page 4 (Accessories)

▷ AF/AFS external sensor: only with atmospheric control
▷ KF/KFS boiler sensor: in combination with heat source control
▷ VF/VFAS flow sensor: only with mixed heating circuit
▷ SPF/SPFS storage sensor

26

Room control

The room temperature can be detected and controlled as follows:

FBR2 remote control with room sensor, Assign the desired heating

▷

circuit using DIP switch 5.

Expert - Electrical connections

▷ If a second room sensor is connected to terminal 19, it automati-

cally affects the other heating circuit.

Set parameters

P9, P14, P18, P19, P30, P31, P32, P50, P51, P52, P60 and P70

The factory settings apply for all other parameters, see page 32

(Expert – Set parameters) for explanations.

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

If a remote control is connected, set DIP switch 5:

▷ DIP switch 5=“ON”: Remote control with room sensor FBR2 for

direct heating circuit,

▷ DIP switch 5=“OFF”: Remote control with room sensor FBR2

for mixer circuit.

See page 31 (Expert – Set DIP switches) for explanation.

Controller for a mixed heating circuit as expansion for a

heating system controller

Requirements

▷ This application is automatically activated if only one flow sensor

(VF/VFAS) is connected.
Set parameter 23 = Address 2 – 15 for the mixer circuit to be

▷

controlled. This address must not be assigned to another heat­ing circuit.

Lago 01

5

87

21

2

VF

2

2

Sensor

▷ VF/VFAS flow sensor: for the mixer circuit.

Set parameters

P14, P19 and P70
The factory settings apply for all other parameters, see page 32 (Expert
– Set parameters) for explanations.

27

Expert - Electrical connections

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

Additional functions with multifunction relay

The multifunction relay (terminal 4) can be used for additional functions.

▷ DIP switch 4 = “OFF” (Multifunction relay activated)

Circulation pump,
parameters 80

Feed pump 1,
P80 = 03

Return flow
booster, P80 = 24

= 02

KF

SPF

Set P81 and P82
according to boiler
manufacturer's
specifications

Controller for a heat source in a cascade: Heating module

Requirements

This application is automatically activated when

▷ a heat source sensor (KF/KFS) is connected and
▷ parameter 38 is assigned an address 1 to 88 (address heating

module).

The heating controller controls “his” heat source according to the

requests from the cascade controller.

The internal mixer circuit can be used should the mixer circuits con-

trolled by the cascade controller (e.g. Merlin) be insufficient. In this
case, parameter 23 for the internal mixer circuit must be set to an
address 1 – 15.

Sensors, see page 4 (Accessories)

▷ KF/KFS boiler sensor
▷ VF/VFAS Flow sensor (only with use of the internal mixer circuit)

28

Expert - Electrical connections

The multifunction relay controls the heat source pump.

T2 10
T1 9

CAN-Bus

Merlin

VF

AF

SPF

#1

Lago
0321

T2 10
T1 9

420

KF

#2

Lago

0321

420

KF

Set parameters

P30, P31, P32, P38, P80 = 5
The factory settings apply for all other parameters, see page 32 (Expert
– Set parameters) for explanations.

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

The multifunction relay controls the return flow booster.

#1
Lago

0321

T2 10
T1 9

41920

KF

#2

Lago
0321

T2 10

T1 9
19
420

KF

CAN-Bus

Merlin

VF

AF

SPF

Set parameters

P30, P31, P32, P38, P80 = 24, P81 and P82
The factory settings apply for all other parameters, see page 32 (Expert
– Set parameters) for explanations.

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

29

Expert - Electrical connections

Internal hot water preparation of the first heat source in the
cascade (hydraulic separation)

Requirements

This mode of operation is automatically activated when

▷ a heat source sensor (KF/KFS) is connected and
▷ parameter 38 is assigned an address 1 to 88 (address heating

module).
In this application the relay for the hot water charging pump is used
for controlling the three-way valve for switching the heat source to
the hot water storage tank. The multifunction relay controls the heat
source pump.

#2

Lago

0321

T2 10
T1 9

420

KF

CAN-Bus

Merlin

AF

VF

SPF

#1

Lago

0321

T2 10
T1 9

420

KF

The factory settings apply for all other parameters, see page 32

(Expert – Set parameters) for explanations.

Set DIP switches

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6

KF, SPF, VF, AF… (5 kΩ)

KFS, SPFS, VFAS, AFS… (1 kΩ)

= OFF

= ON

See page 31 (Expert – Set DIP switches) for explanation.

Set parameters

P30, P31, P32, P38, P80 = 05

30

Expert – Set DIP switches

1 2 3 4 5 6

Expert – Set DIP switches

= OFF = ON

▷

The DIP switches 1 – 3 are now without function. The heating

circuit address of the mixer circuit is set via parameter 23, see
page 34 (P23 CAN bus ID mixer circuit (heating circuit address)).

Direct heating circuit or multifunction relay

The output on terminal 4 can be switched over between “Pump direct

heating circuit” and “Multifunction relay”.

• Use DIP switch 4.

Direct heating circuit

MFMultifunction relay

1 2 3 4 5 6

▷ If terminal 4 is to be used for the direct heating circuit pump, set

the heating circuit address 2 or higher for the mixer circuit because
the direct heating circuit occupies address 1.

Assigning a remote control FBR to the direct heating

circuit or mixer circuit

A connected remote control FBR2, a connected room sensor or

room thermostat can be assigned to the direct heating circuit or

the mixer circuit if the system is operated with two heating circuits.

• Use DIP switch 5.

Direct heating circuit

Mixer circuit

Set sensor resistance

The heating controller can be operated with 5 kΩ or 1 kΩ sensors.

• Use DIP switch 6.

1 kΩ PTC

5 kΩ NTC

123456

▷ Only sensor of one type may be used.

31

Expert – Set parameters

Expert – Set parameters

▷

Parameters P1 to P19 for User, see page 12 (User – Set parameters)

WARNING

Incorrect settings can cause malfunctions and damage the heating
installation! Only a qualified expert may change the parameters
from no. 21.

▷ A code number must be entered via parameter P20 to change

parameters P21 and higher.
1 Turn selector switch to

▷ The display shows .

 Turn the rotary knob until the parameter you want to change or

retrieve appears on the left in the display: 21 to 99.
 Press the OK button.

▷ The indicator jumps to 20 0000. The first digit flashes.

4 Enter code no. (factory setting is 0000).

▷ Set each digit with the rotary knob and press the OK button.
▷ The display jumps back to the parameter to be changed.
▷ Display flashes if the correct code no. was entered. (The display

does not flash if the code no. was not entered correctly. Continue

with step 3.)
5 Use the rotary knob to set the desired value.

▷ A number of parameters can only be displayed.

6 Press the OK button to confirm.
7 After you have made your settings, continue with step 2 if you

want to change further parameters (you do not need to enter the

code no. again), or turn the selector switch back to .

▷ The table on page 33 (List of parameters P20 to P99) shows the

possible settings.

▷

Our heating controller will only display those parameters for which

there are sensors connected.

(Parameter setting).

32

Expert – Set parameters

List of parameters P0 to P99

P.

Parameter Setting range

no.
20 Code no. input 0000 – 9999 0000
21 Code no. 0000 – 9999 0000

Outside temperature

22

Frost protection

23 CAN bus ID mixer circuit

With active heat source (HS) (boiler module/heating module)

30 Maximum temperature HS 30.0 – 110.0 °C 85.0 °C
31 Minimum temperature HS 10.0 – 80.0 °C 40.0 °C
32 Warm Up Temp 10.0 – 80.0 °C 35.0 °C
33 Minimum limiter HS 0, 1, 2 1
34 Dyn. switching hysteresis 5.0 – 20.0 K 10.0 K
35 Hysteresis time 0 – 30 min 0 min
36 Burner starts Display only
37 Burner running time Display only

Address heating module

38

(only for cascade
operation)

With active hot water function

50 DHW Relief 0, 1 1
51 Parallel pump operation 0, 1 0
52 Antilegion function 0, 1 1

Temperature increase

53

during hot water
preparation

With active direct heating circuit

Maximum flow tempera-

60

ture direct heating circuit
Minimum flow temperature

61

direct heating circuit

----,

-15.0 to +5.0 °C
1 – 15 (2 – 15 with
direct heating circuit)

----, 1 – 8 ----

0.0 – 50.0 K 20.0 K

20.0 – 110.0 °C 80.0 °C

10.0 – 110.0 °C 10.0 °C

Factory
setting

0.0 °C

2

Own
values

P.

Parameter Setting range

no.

With active mixer circuit

Additional mixer functions

69

(P77 – 79)
Maximum flow tempera-

70

ture mixer circuit
With underfloor heating, set parameter 70 according to manufac­turer‘s specifications.
Minimum flow temperature

71

mixer circuit

72 Mixer Dynamic OPEN

73 Mixer Dynamic CLOSED

In combination with heating system controllers with active cooling
function

74 T-Flow Cooling 0, 1, 15.0 – 25.0 °C 15.0 °C
75 T-Room Cooling ----, 20.0 – 40.0 °C 25.0 °C
76 Min TO Cooling ----, 0.0 – 40.0 °C 27.0 °C

P77 – 79 can only be adjusted if P69=1

77 Mixer scan time 10 – 200 s 100 s
78 Mixer operating time limit ----, 0 – 30 min
79 Mixer start seconds 0 – 30 s

With multifunction relay (MF Relay)

80 MF Relay function 0 – 34

MF Relay switching

81

temperature

82 Hysteresis of the MF Relay 2.0 – 10.0 K 5.0 K

Service

PC enable (0000 =

97

disabled)

98 Relay Test 0, 1 – 6 0

Software version and

99

index (63.XX)

0, 1 0

20.0 – 110.0 °C

10.0 – 110.0 °C 10.0 °C

5.0 – 25.0
(P69=1: 5.0 – 200.0)

5.0 – 25.0
(P69=1: 5.0 – 200.0)

30.0 – 90.0 °C 30.0 °C

0000 – 9999 0000

63.00 – 63.99 Display only

Factory
setting

80.0 °C

16.0
(P69=1: 50)

12.0
(P69=1: 20)

---­0 s

0

Own
values

33

Expert – Set parameters

Explanation of the parameters

P0 Code no. input

Here the code number defined via P21 is entered for adjustment of
the Expert parameters.

▷ The factory setting for the heating controller is 0000.

P1 code no. change

Here you can specify your own code no. Remember this code well!

The parameters 21 – 99 can not be changed without this code no.

Should you forget the code no., the factory settings must be re­loaded, and this means that all your settings will be lost, see page

12 (Load factory settings (Reset)).

• Change every digit of the four-digit code no. and confirm by
pressing the OK button.

P Outside temperature frost protection

P22 = ----: Frost protection is deactivated.
P22 = -15.0 to +5.0 °C: When the outside temperature drops be­low the set value, the heating circuit controller switches the heating
circuit pumps on.

P CAN bus ID mixer circuit (heating circuit address)

P23 = 1 – 15: It is possible to assign an address from 1 to 15 to the
mixer circuit. If the direct heating circuit is activated via DIP switch 4,
you must set an address of 2 – 15 for the mixer circuit because the
direct heating circuit automatically receives the address 1.

▷ Do not assign a heating circuit address more than once.
▷ When replacing a controller, always set the same address as the

original controller.

With active heat source (boiler module/heating module)

P0 Maximum heat source temperature

P30 = 30.0 – 110.0 °C: The heat source is heated to the maximum
of P30.

Protects the heat source from overheating and prevents triggering

▷

the Safety-Temperature-Limiter (LIMITER).

▷ Limiting the maximum temperature saves energy.
▷ Also has an effect on the hot water preparation.
▷ Settings according to boiler manufacturer’s specifications.

P1 Heat source minimum temperature

P31 = 10.0 – 80.0 °C: Set the parameter so that the formation of
condensation is prevented in the heat source when there is a low
heating requirement. The heat source does not switch off before P31

+ Switching hysteresis (P34) has been reached when heating up.

▷ Settings according to boiler manufacturer’s specifications.

P Warm-Up Temp

P32 = 10.0 – 80.0 °C: The heating controller switches the heating
circuit pumps off and closes the mixer until the heat source has
reached the temperature P32 when heating up.

▷ This reduces operation within the condensation range.
▷ Settings according to boiler manufacturer’s specifications.

P Minimum limit heat source

Reduces the formation of condensation in the heat source when there
is a low heating requirement. The heating controller does not switch
off before the minimum temperature (P31) + Switching hysteresis
(P34) has been reached.
P33 = 0: The minimum limit is switched off.
P33 = 1: The heat source maintains at least the set minimum tem­perature (P31) + Switching hysteresis (P34) during any heating time.

34

Expert – Set parameters

P33 = 2: The heat source maintains at least the set minimum tem­perature (P31) + Switching hysteresis (P34) for 24 hours (including
setback mode times).

P4 Dynamic switching hysteresis

P34 = 5.0 – 20.0 K: The switching hysteresis is added to the Mini­mum Temperature (P31) of the heat source to calculate the actual
switch-off value.

P5 Hysteresis time

This function optimises heat source operation when subjected to

varying loads.

P35 = 0: The switching hysteresis (P34) is not reduced.
P35 = 1 – 30 min: The switching hysteresis (P34) is reduced to a hyster­esis of 5K after the heat source is switched on and P35 has elapsed.

▷

When there is little removal of heat, set a long period for P35. This
prevents frequent pulsing of the heat source.

▷ Set a short period for P35 when there is a high removal of heat.

This avoids heating up the heat source to unnecessarily high

temperatures. The energy consumption of the heating system
is optimised.

Example: Hysteresis time

P34 = 15, P35 = 10

20

15

P34 [K]

10

5

246810 12 14 16

P35 [Min.]

The initial switching hysteresis is reduced from 15 K to 5 K after 10

minutes.

P6 Burner starts

P36 shows the number of burner starts (no setting possible).

P7 Burner operating time

P37 shows the entire burner operating time in hours (no setting
possible).

P8 Address heating module (only for cascade operation)

P38 = ----: individual heat source (no cascade)
P38 = 1 – 8: In a cascade the heating controller is addressed under

the address specified.

With active hot water function

P50 DHW Relief (charging pump lock)

P50 = 0: The charging pump lock is switched off.
P50 = 1: The heating controller only switches the storage charging

pump on when the heat source temperature exceeds the storage
temperature by 5K. The controller switches the pump off as soon as
the heat source temperature drops below the storage temperature.

▷ This prevents the storage from being cooled by the heat source

at the beginning of hot water preparation.

P51 Parallel pump operation

P51 = 0: Hot water priority mode; During hot water preparation the

heating circuit pumps switch off the mixer valves close.

P51 = 1: Parallel pump operation; During hot water preparation the

heating controller only disables the direct heating circuit. The mixer

circuit continues to be heated.

35

Expert – Set parameters

▷ This function extends hot water preparation.

P5 Antilegion function

P52 = 0: Protective function switched off.
P52 = 1: As a protective measure against thermoresistant bacte­ria, the hot water storage tank is heated to 65 °C with every 20th
heating-up process or at least once per week on Saturday at 01:00.

P5 Temperature increase during hot water preparation

P53 = 0.0 – 50.0 K: The heat source is operated at increased tem­perature during hot water preparation to ensure that the hot water
temperature is reached quickly via the heat exchanger.

The heat source desired temperature during hot water preparation

▷

= Desired hot water temperature + P53.

With active direct heating circuit

P60 Maximum flow temperature direct heating circuit

P60 = 20.0 – 110.0 °C: The heating controller limits the calculated
desired flow temperature of the direct heating circuit to P60 to protect
the consumer from overheating.

▷ Only when the temperature of the heat source exceeds P60 by

8K does the heating controller switch off the heating circuit pump
of the direct heating circuit. The controller will switch the heating
circuit pump back on as soon as the heat source temperature
drops below P60 + 5 K.

P61 Minimum flow temperature direct heating circuit

P61 = 10.0 – 110.0 °C: The heating controller increases the calculated
desired flow temperature of the direct heating circuit to P61, when
air heating is installed for example.

With active mixer circuit

P69 Additional mixer functions (P77 – 79)

P69 = 0: The additional mixer functions (P77 – 79) are deactivated.
Instead, the mixer is operated with default settings. This means
that the heating controller computes a correction value for the mixer
position every 10s (scan time).

▷ Settings when motor-driven roller wheel mixers are used.

P69 = 1: P77 – 79 can be set.

▷ Settings when motor-driven lifting valves are used.

P70 Maximum flow temperature mixer circuit

P70 = 20.0 – 110.0 °C: The heating controller limits the calculated
desired flow temperature of the mixed heating circuit to P70 to
protect the consumer from overheating, e.g. when an underfloor
heating system is installed.

P71 Minimum flow temperature mixer circuit

P71 = 10.0 – 110,0 °C: The heating controller increases the calculated
desired flow temperature of the mixed heating circuit to P71, e.g.
when air heating is installed.

P7 Mixer Dynamic OPEN (when opening)/
P7 Mixer Dynamic CLOSED (when closing)

P72/73 = 5.0 – 25.0 (when P69 = 1; 5.0 – 200.0):

The Mixer Dynamic determines the ratio between switch-on and

switch-off times of the mixer when opening or closing the mixer.
Depending on the deviation between desired and actual flow tem­perature, the mixer is actuated for a longer or a shorter period. The
ratio is based on a scan rate of 10s.

▷

Lower values cause fast mixer movement and can result in vi­bration.

36

Expert – Set parameters

Example: Mixer Dynamic OPEN

P72 = 8

10

9
8
7
6

On-period [s]

5
4
3
2
1

1 2 3 4 5

5 8 10 12

6 7 8 9 10 11 12

Control deviation [°K]

14
16

18
20
22
24

In the case of a controller deviation of 6 K the mixer is actuated for

7s and remains switched off for 3s.

In combination with heating system controllers with active
cooling function

As a requirement for cooling mode, the central controller (e.g. Merlin)

must activate the “Cooling” operating mode.

74 T-Flow Cooling (flow temperature Cooling)

P74 = 0: The heating circuit is not cooled. The mixer in the heating
circuit remains closed, the heating circuit pump is switched off.
P74 = 1:

CAN-Bus

Merlin

Lago 0321

587

OFF

2

2

21

2

VF

ON

The mixer in the heating circuit functions as a valve. The mixer

opens (ON). The heating circuit pump is switched on.

P74 = 10.0 – 25.0 °C: The mixer controls to the set flow temperature

P74 of the heating circuit, see page 38 (Example: Cooling Operation).

P75 T-Room Cooling (desired room temperature)

Room temperature guided cooling

P75 = ----: The heating controller does not control according to

desired room temperature.

P75 = 20.0 – 40.0 °C: The heating controller starts cooling mode

of operation as soon as the temperature exceeds the set desired

room temperature P75. Cooling mode ends when the temperature

drops below P75 by 2K.

P76 Min TO Cooling (Minimum outside temperature for cooling)
Weather-guided cooling

37

Expert – Set parameters

P76 = ----: The heating controller does not control guided by the
weather.
P76 = 0.0 – 40.0 °C: The heating controller starts cooling mode
of operation as soon as the temperature exceeds the set outside
temperature P76. Cooling mode ends when the temperature drops
below P76 by 1 K.
If values have been defined for P75 as well as P76, both conditions
must be met for cooling mode to start.

Example: Cooling Operation

CAN-Bus

Merlin

OFF

ON

Lago 0321

54 87

21

2

VF

2

2

hot water preparation and the direct heating circuit. The Lago 0321
controls the bypass valve and the mixed heating circuit.
P80 = 34, P74 = 20 °C
As soon as the central controller activates “Cooling” mode, the mul­tifunction relay in the Lago0321 responds and opens the bypass
valve (ON) so that the cooling circuit is separated from the heat source.

The mixer 2 controls to the set flow temperature P74.

P77 – 79 can only be adjusted if P69=1

The parameters P77 – 79 are required when a motor-driven elevating

mixer is used.

P77 Mixer scan time

P77 = 10 – 200 s: The flow temperature is measured in cycles after
P77 has elapsed respectively.

▷ The longer the pipes the higher the value for P77 should be set.

P78 Mixer operating time limit

P78 = ----: Limit in the direction CLOSED = 10min, limit in the
direction OPEN = none
P78 = 0: No limit in either direction
P78 = 1 – 30 min: The value specifies the maximum length of time
that the mixer is operated in one direction (OPEN or CLOSED).

▷

This is important when the mixer is not equipped with a safety-

friction clutch or limit switches.
After the mixer has moved in one direction for the specified period,

▷

the mixer will not be controlled in the same direction until there
has been a control process in the opposite direction.

▷ Settings according to mixer manufacturer’s specifications.

The central controller activates the “Cooling” operating mode via the

CAN bus and controls the heat source, the refrigerating machine, the

38

Expert – Set parameters

P79 Mixer start seconds

P79 = 0 – 30 s: The first stroke of a closed mixer does not immediately
effect a change in the flow temperature. P79 is the time that elapses
until a change in flow temperature can be measured.

▷

Increase this value if the flow temperature changes too slowly
during the initial stage.

With multifunction relay (MF Relay)

The multifunction relay (terminal 4) is active with the setting DIP

switch4 = “OFF”. The sensor on terminal 19 is assigned to the relays.

P80 MF Relay function

P80 = 0: without function
P80 = 1: Header pump (only when the Lago0321 is used as a
heating system controller)

▷

The header pump is switched on when a consumer requests heat.

▷

When there is no heat request, the pump is switched off. The pump
runs on for 5 minutes after the heat source has been switched off.

P80 = 2: The circulation pump is switched on simultaneously with

the hot water program.

▷ A storage sensor must be installed in the system.

P80 = 3: Feed pump

▷

The feed pump is switched on when an internal consumer re-

quests heat.

▷

When there is no heat request, the pump is switched off. The pump
runs on for 5 minutes after the heat source has been switched off.

P80 = 5: Heat source pump

▷

The multifunction relay switches in combination with the burner

relay (T1 – T2), run-on = 5 min

P80 = 20: Temperature-controlled circulation pump

T-CIRCL = Return flow temperature of the circulation line (measured

by the multifunction sensor)

▷

The circulation pump is switched on when T-CIRCL < P81, i.e.

when the return flow temperature is lower than the switching
temperature of the multifunction relay (set via P81).

▷ The pump is switched off when T-CIRCL >P81 + P82, i.e. when

the return flow temperature is higher than the switching tempera­ture of the multifunction relay (set via P81) plus hysteresis (P82).

▷ The pump can only be switched on during the switch-on times

of the hot water program (P18).

P80 = 21: Circulation pump via pulse

▷ The circulation pump is switched on for 5 minutes when there is

a short-circuit between terminal 19 and GND.

▷ The pump can only be switched on during the switch-on times

of the hot water program (P18).

P80 = 24: Return flow booster, heat source

T-RETURN= Return flow temperature of the system (measured by

the multifunction sensor)

▷

The pump for the return flow boost is switched on when T-RETURN
< P81, i.e. when the return flow temperature is lower than the

switching temperature of the multifunction relay (set via P81).

▷

The pump is switched off when T-RETURN >P81 + P82, i.e. when

the return flow temperature is higher than the switching tempera­ture of the multifunction relay (set via P81) plus hysteresis (P82).

39

Expert – Set parameters

P80 = 34: Bypass valve in cooling mode

▷

The multifunction relay witches as soon as a central controller, e.g.

Merlin, activates the operating mode “Cooling”.

▷

During cooling mode hot water preparation is possible by means
of conventional heat sources.

▷

Example see page 37 (P76 Min TO Cooling (Minimum outside
temperature for cooling)).

P81 Switching temperature of the multifunction relay

P81 = 30.0 – 90.0 °C: Switching requirements: see page 39 (P80 MF
Relay function).

P8 Multifunction relay hysteresis

P82 = 2.0 – 10.0 K: The multifunction relay is switched off when the
measured temperature is greater than P81 + P82.

Service

P97 PC enable (0000 = disabled)

P97 = 0000 – 9999: Unlock code that can be used to retrieve data
from the mixed heating circuit by means of the PC software “Com­fortSoft”.

• Change every digit of the four-digit code no. and confirm by
pressing the OK button.

P98 Relay Test

The relay test is used to check the electrical connection.

Each relay output is actuated one after the other by changing the
parameter values. The corresponding output is shown in the display.
P98 = 0: No relay is controlled
P98 = 1: Heating circuit pump Direct heating circuit / multifunction
relay (terminal 4)
P98 = 2: Heating circuit pump Mixed circuit (terminal 5)

P98 = 3: Storage charging pump (terminal 6)
P98 = 4: Mixer Open (terminal 7)
P98 = 5: Mixer Closed (terminal 8)
P98 = 6: Burner electrically isolated (terminals 9 – 10)

Perform relay test

▷ Turn the selector switch back to

1 Turn selector switch to (parameter setting).

▷ The display shows PL.

 Turn rotary knob until 98 0 appears in the display.
 Press the OK button.

▷ Display jumps to 20 0000. The first digit flashes.

4 Enter code no. (factory setting 0000). To do this, set each digit

using the rotary and press the OK button.

▷ Display jumps back to 98 and the 0 flashes. (If an incorrect code

number was entered, the display jumps back to 20 0000. Con­tinue with step 4.)

5 Use rotary knob to select the desired relay output (1, 2, 3, 4, 5

or 6) to control.

▷ The controlled relay output flashes in the display.

6 Check the device connected to the relay output for active running.

▷ Continue with step 5 if further relay outputs need to be checked.
▷ After no more than 10 minutes control of the connected device

is terminated and the display of the relay to control jumps to “0”.

7 Press the OK button to terminate the relay test.

▷ Display jumps to 98 0.

8 Turn selector switch back to .

P99 Software version and index (6.XX)

P99 = 63.00 - 63.99

If you have questions about your heating controller, always specify

▷

the software version.

to cancel.

40

Expert – Checklist for commissioning

❑

Heating controller properly wired? Particularly the bridges between
L and L1 and between GND and terminal 16, see page 21 (Con­nection diagram controller without socket) and page 22 (Connection
diagram controller with socket).

❑ Are the sensors required for the application connected?
❑ Sensors that are not required are not connected.
❑

DIP switch set correctly? See page 31 (Expert – Set DIP switches).

❑

User parameters configured? Set at least time and day of the
week, see page 8 (Set time and day of the week).

❑

Expert parameters configured? See page 32 (Expert – Set pa­rameters).

❑ Sensors tested for plausible values? See page 8 (Display actual

temperatures).

❑ Relay outputs tested? See page 40 (P98 Relay Test).
❑ Operating mode set? See page 8 (Set operating mode).
❑ Selector switch turned to ?

Expert – Checklist for commissioning

41

Service

Service

1 Remember the current operating mode.
 Turn selector switch to “Mode”.
 Press the OK button.

▷ Display flashes.

4 Rotate the rotary knob clockwise up to .
5 Press the OK button.
6 Perform service.

▷ The heat source heats to the max. temperature set via parameter

30. As soon as the temperature of 65 °C has been reached,
the consumers regulate to their max. flow temperature for heat
removal.

7 Press OK after you have completed the service procedure.
8 Use the rotary knob to set the mode back to the original operating

mode.

9 Turn selector switch back to .

▷ The heating controller resets the “Service” operating mode auto-

matically after 15 minutes.

STL Test

▷ You will find information on the trigger temperature of the STL in

the heat source manual.

▷

It is not necessary to disconnect the heating circuit pumps or the
mixer for the STL test.

▷ The boiler sensor must be connected.

1 Turn selector switch to “Mode”.
 Press and hold the OK button.

▷

Display flashes and shows the actual temperature of the heat
source. The temperature rises for as long as the OK button re­mains pressed, up to the point that STL triggers.

 Unlock the STL manually.

▷ If the STL does not trigger, replace STL.
▷

Once the OK button is released, the heating circuit pumps switch
on to remove heat.

42

Accessories

Accessories

Operating module Merlin BM, BM8, or remote
control Lago FB

The controller supports the option to connect an operating module

via the CAN bus. With the operating module it becomes possible
to move various operating functions and the monitoring of system
values into the living space itself.

This makes operation very convenient. The technical information for

the operating module describe the full range of functions in detail.

▷ Display of the Expert parameters
▷ Input of User parameters
▷ Room temperature control
▷ Automatic adaptation of the heat slope (not for Lago FB)

Merlin BM

With plain text display in the language of the country; illuminated,
4-digit display; a button is allocated to every row, very convenient
to operate.

Instructions in German: Order no. 99 778 201

With instructions in language of your choice: Order no. 99 778 202

Installation and operation, see enclosed instructions.

BM 8

Plain text in language of the country and symbols in the display, op­eration with three buttons, easy setting of desired room temperature

with rotary knob, party button and mode selection.

Instructions in German: Order no. 99 678 736

With instructions in language of your choice: Order no. 99 678 738

Installation and operation, see enclosed instructions.

Lago FB

Operation as for heating controller Lago 0321.

Order no. D/D 99-678-868
Installation and operation, see enclosed instructions.

PC Adapter

For the communication between heating controller with bus and a PC.

The ComfortSoft program can be used to set and retrieve all system

parameters. In the PC the parameters can be saved, graphically dis­played and evaluated within a specified time periods. The software

is available for download at www.docuthek.com. For a connection
to the PC the CoCo PC active is required, which, in combination
with a modem, also supports sending error messages via SMS

43

Accessories

and the remote retrieval of controller data. The CoCo PC mobile is
an alternative without remote retrieval or error messages via SMS.

CoCo PC active

Order no. 99 678 288

Scope of supply

CoCo PC active, instructions.

The connecting cable for the RS232 interface must be ordered sepa-

rately: Order no.: 99676894.

CoCo PC mobile

Order no. 99 677 961

Scope of supply

CoCo PC mobile, instructions, connecting cable to USB mini-B for
CAN bus or eBus.

On installation and operation, see enclosed instructions.

Remote control and room sensor FBR

Remote control for selecting the operating mode and setting the
desired room temperature

Order no. 99 679 161
Installation and operation, see enclosed instructions.

Room sensor RFB

Order no. 99 676 857

Scope of supply

Room sensor

Position of installation

▷ In the main living room of the heating circuit on an inside wall
▷ Not in the vicinity of radiators or other devices that give off heat
▷ Not covered by curtains
▷ Not influenced by draught
▷ The radiator valves in the room must be fully opened.

44

Installation
1 Remove upper part from base at the underside.
 Screw base to the wall.

Accessories

 Connect electrically, see page 18 (Expert - Electrical connec-

tions).

4 Press upper part back on.
5 Set parameter 10 or 15 on the heating controller.

Sensor

Outside sensor AF/AFS

Order no. AF, 5 kΩ: 99 679 030
Order no. AFS, 1 kΩ: 99 679 001

Scope of supply

Outside sensor, screw and dowel

Position of installation

▷ Ideally on a wall facing north or north-east
▷ Approx. 2.5 m above the ground
▷ Not above windows or air shafts

Installation
1 Pull cover off sensor.
 Fasten sensor with enclosed screw.
 Connect electrically, see page 18 (Expert - Electrical connections).

Boiler sensor KF/KFS
Storage sensor SPF/SPFS

Order no. KF/SPF, 5 kΩ, 3 m, ø 6.0x50:

99 676 769

Order no. KFS/SPFS, 1 kΩ, 3 m, ø 6.0x50:

99 676 682

Position of installation

In the immersion pipe of the hot water storage tank (usually on the

front side of the storage tank

Installation

1 Dry immersion pipe.

 Insert the sensor as far as possible into the immersion pipe.

 Connect electrically, see page 18 (Expert - Electrical connections).

Flow sensor VF/VFAS

Order no. VF, 5 kΩ, 3 m, ø 6.0x50: 99679073

Order no. VFAS, 1 kΩ, 3 m, ø 6.0x50: 99679051

Scope of supply

Flow sensor, thermal compound, retaining strap, instructions

Position of installation

▷ In the case of heating system control instead of boiler sensor KF,

as close as possible at the back of the boiler on the heater flow

▷ In the case of mixer operation approx. 0.5 m behind the heating

circuit pump

Installation

1 Thoroughly clean flow pipe.

 Apply thermal compound to sensor.

 Fasten sensor to the flow pipe with the retaining strap.

45

Accessories

4 Connect electrically, see page 18 (Expert - Electrical connections).

Sensor values

Temp.

[°C]

-60 698961 470

-50 333908 520

-40 167835 573

-30 88340 630

-20 48487 690

-10 27648 755
0 16325 823

10 9952 895
20 6247 971
25 5000 1010
30 4028 1050
40 2662 1134
50 1801 1221
60 1244 1312
70 876 1406
80 628 1505

90 458 1607
100 339 1713
110 255 1823
120 194 1936

▷ Only sensor of one type may be used.

5 kΩ NTC:

AF, KF, SPF, VF

[Ω]

1 kΩ PTC: AFS, KFS,

SPFS, VFAS

[Ω]

▷

Set the sensor type with DIP switch 6, see page 31 (Expert –
Set DIP switches).

▷ The sensor value of a remote control unit with room sensor FBR

or a room sensor RFB is detected automatically.

46

Help with faults

Help with faults

? Fault
! Cause

• Remedy

When a fault occurs, the associated error number is indicated in
the display.

Fault Error no.

The mixer does not

start.

The heating circuit

pumps do not switch
off.

No more hot water
available.

The flat does not get

warm. No more hot
water available.

The multifunction

pump is off.

The flat gets too warm.

• Check electrical connection. Replace sensor, if necessary.

? The display shows error no. E 81.
! EEPROM error. An invalid parameter has been replaced by the

default value.

• Check parameter values.

• Switch mains power off and on again to reset the error no.

E 69

E 75

E 76

E 77

E 79

E 80

Defective sensor (break /
short-circuit)

Flow sensor mixer circuit

VF/VFAS

Outside sensor

AF/AFS

SPF/SPFS storage sensor

Boiler sensor
KF/KFS

Sensor for the multifunction
relay

Room sensor

? The display shows error no. E 91.
! The set CAN bus address is already used by a different device.

• Set parameter 23 to a different address that is not yet in use.

? All radiators and the hot water storage tank are cold. But the

heating controller display shows high temperatures.

? All radiators and the hot water storage tank are warm. But the

heating controller display shows low temperatures.

! DIP switch 6 set to wrong sensor type.

• Set DIP switch 6 correctly:
OFF = 5 kΩ sensor (KF, SPF, VF, AF…),
ON = 1 kΩ sensor (KFS, SPFS, VFAS, AFS…)

▷ Never mix 1 kΩ and 5 kΩ sensors.

? When displaying the actual values on the heating controller you

realise that the indicated value does not match the real one. For
example, the actual hot water temperature is 20 °C, but the display
shows 65 °C (or vice versa).

! 1 kΩ and 5 kΩ sensors have been mixed.

• Only use sensors with identical resistance values.

47

Help with faults

? No actual values are indicated on the heating controller.
! No bridge between terminal 16 and GND.

• Check electrical connection, set bridge and load factory settings
on the heating controller (Reset).

? Although pumps and mixer are indicated on the display they are

not actuated.

! No bridge between terminals 2 and 3 or terminal 1 and neutral

block.

• Check electrical connection.

? The flat does not get warm.
! The heating circuits do not respond to the mode setting.

• Set parameters 08 and 13 = “----”.

! The heating times at the bottom of the display to not match the

desired heating program.

• Set parameter 19: P19 = 00 for direct heating circuit, P19 = 01
for mixed heating circuit.

• Set parameters 08 and 13 = “----”.

! Pump for direct heating circuit is not running.

• Set DIP switch 4 to “Pump direct heating circuit”.

? The hot water stays cold during summer mode.
! Parameter 18 = 03 set (hot water 1h before heating)

• Set P18 = 01 or 02.

Should the actions described above fail to help, please
contact your heating engineer.

▷ Please have ready the software version (parameter P99).

48

Technical data

Mains voltage according to DIN IEC 60 038: ~230 V, ±10%
Power consumption: max. 5 VA
Switching capacity of the relays: ~250 V, 2(2) A
Max. current via terminal L1’: 6.3 A
Protection class according to DIN EN 60529: IP 40
Protection class according to DIN EN 60730: I
Reserve power of clock: >10 h.
Permissible ambient temperature during operation: 0 to 50 °C
Permissible ambient temperature during storage: -20 to 60 °C
Permissible relative humidity, not condensing: 95%r.H.

Sensor resistances: NTC 5 kΩ (AF, KF/SPF, VF),
Tolerance in ohms: ±1 % at 25 °C,
Temperature tolerance: ±0.2 K at 25 °C

Sensor resistances:

PTC 1010 Ω, (AFS, KFS, SPFS, VFAS)
Tolerance in ohms: ±1 % at 25 °C,
Temperature tolerance: ±1.3 K at 25 °C

Efficiency gain*

3,5% VII

* In accordance with Directive 2009/125/EC Communication 2014/C_207/02/

Controller

class

In combination with

Room temperature control

Outside temperature control

Staged boiler temperature control

Technical data

49

Glossary

Glossary

Flow and return flow temperature

The flow temperature is the temperature to which the heat source

heats the water that transfers the heat to the consumer (e.g. radiator).

The return flow temperature is the temperature of the water that flows

back from the consumer to the heat source.

Desired and actual temperature

The desired temperature (or setpoint temperature) describes the

desired temperature for a room or for hot water.
The actual temperature denotes the actual temperature that prevails.
The heating controller has the task to adjust the actual temperature

to the desired temperature.

Setback temperature

The setback temperature is the desired temperature to which the

heating system heats outside heating times (e.g. at night). It should

be set so that the rooms do not cool down too much while saving

energy.

Heat source

Heat source is generally the designation for the heating boiler. It may

also be a buffer storage tank however.

Circulation pump

The circulation pump ensures that there is constant hot water avail-

able. The hot water is held in the storage tank. The circulation pump

circulates it via the fresh water pipes in accordance with the heating

program.

Return flow booster

The return flow booster prevents the temperature difference at the heat

source between flow an return becoming too great. A mixing valve is
here used to add a portion of the hot flow water to the return flow to
prevent condensation of the steam from the heating gas against the
cold heat carrier inside the heating boiler. The minimum temperature
required for this process inside the heating boiler depends on the
type of fuel (oil 47°C, gas 55°C). The risk of corrosion inside the
heating boiler is thereby reduced significantly.

Direct heating circuit

In the direct heating circuit the flow temperature is identical to the
heat source temperature, i.e. the direct heating circuit is operated
with the maximum temperature.

Mixed heating circuit / Mixer circuit

In the mixed heating circuit a three-way valve is used to add cooled
water from the return flow to the hot flow water. The flow temperature
is thus reduced. This is important for underfloor heating systems,
for example, because they must only be operated with low flow
temperatures.

Heating time

In the heating programs you can define up to three heating times per
day, one for the morning, one for lunchtime, and one for the evening
for example. During a heating time, the temperature is controlled to
the desired room temperature. Between heating times the tempera­ture is controlled to the setback temperature.

50

Certification

Header pump

A header pump is used to pump the hot water in a system with one

or several heat sources. It is switched on as soon as a consumer in

the system requests heat.

Feed pump

A feed pump functions like a header pump. It is switched on as soon

as an internal consumer in the system requests heat.

Legionella

Legionella are bacteria that live in water. The hot water storage tank
is heated to 65°C every 20th heating period or at least once a week
as protection against these bacteria.

Certification

Declaration of conformity

We the manufacturer declare the product Lago0321 is in conformity
with the fundamental requirements of the following directives and

standards.

Directives:
– 2014/35/EU
– 2014/30/EU
– 94/62/EG
– 2009/125/EG
– 1907/2006

Standards:
– EN 60730-1
– EN 60730-2-9
– EN 60335-1
– EN 60335-2-102
The manufacture is subject to the quality management system in

accordance with DIN EN ISO 9001.

Elster GmbH

Scan of the declaration of conformity (D, GB) – see

www.docuthek.com

Eurasian Customs Union

The product Lago 0321 meets the technical specifications of the

Eurasian Customs Union.

51

Contact

Heating circuit allocation

For the installation expert

Please enter which rooms the heating circuits are assigned to here.

Direct heating circuit Mixed heating circuit

52

Kurt-Schumacher-Allee 2 · 28329 Bremen

https://www.brummerhoop.com

[email protected]