brummerhoop Lago 0321 User manual

Safety
Operating and installation instructions
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.
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 Techni-
cal data.
Please read and keep in a safe place
Please read through these instructions carefully before
installing or operating. Following the installation, pass the instruc-
tions on to the operator.
These instructions can also be found at www.docuthek.com.
Explanation of symbols
•, 1 ,  ,  ... = Action
▷= Instruction
Safety
Heating Controller Lago 01

2
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
Table of contents

3
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

4
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 ................................44
Outside sensor AF/AFS .................................45
Boiler sensor KF/KFS
Storage sensor SPF/SPFS ...............................45
Flow sensor VF/VFAS ....................................45
Sensor values ...........................................46
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

5
Table of contents
Certification ......................................51
Declaration of conformity .............................51
Eurasian Customs Union .............................51
Heating circuit allocation ...........................5
For the installation expert .............................52
Contact ..........................................5

6
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
0On//Off boiler control
Mixer circuit and hot water preparation
Temperature-controlled multifunction relay
1CAN bus communication
Part designations
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
1
2
3
4
4
5
1Selector 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
4Assembly holder of the controller
5Cable feed-throughs
Selector switch
Standard
Mode Operating mode selection
°C Desired room temperature Day (for both heating
circuits)
°C Setback temperature (for both heating circuits)
°C 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

7
Verify type of application
Display
Mo Tu We Th Fr Sa Su
1/
1 2
1
2
3
4
6
7
5
1Days 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
4Heat source temperature (When used as a mixer expansion,
"--" is displayed.)
5Time
6Operating modes:
Operational readiness/OFF (Heating and hot water
preparation OFF, frost protection operation only)
1Automatic mode 1 (Heating according to heating program
1, hot water according to parameter 18)
2Automatic 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.)
7Display of the heating times

8
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
+ Room temperature for up to 8 heating circuits
AF Outside temperature
*) Heat source and concurrently flow temperature of the
direct heating circuits (1st HC)
*) Flow temperature of the mixer circuit (2ndHC)
*) Hot water temperature
FF *) Multifunction sensor temperature
* The desired temperature is displayed when the OK button is pressed.
▷If a sensor is not connected, the display will show -- --.
▷ 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 manu-
ally, 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.

9
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
#3
Lago 0321
#1
Lago 0321
#2
Lago 0321
1
Lago #1
1
1
1
1
#2
1
#3
off off
on on
off
off
off
off
off
on
offon
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 tem-
perature).
This setting is required for events such as a party, when the heat-
ing period in automatic mode will not be sufficient. Do not forget to
switch back to automatic mode once the party is over.

10
User – Settings
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 HO Holiday operating mode
You leave on Monday and return Thursday evening. Before leaving
on Monday program:
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒
Mo–Su
°C
°C
1
S
a–Su
1
Mo–Fr
1 Turn selector switch to „Mode“.
Mo Tu We Th Fr Sa So
1/
1
▷The display shows the current operating mode
(e.g. automatic mode 1)
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
 Press the OK button.
▷Display flashes.
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
 Rotate the rotary knob clockwise until HO 4
flashes in the display.
▷ HO 4 indicates that 4 absent days have been pro-
grammed (in this example Mon, Tue, Wed and
Thu).
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
4 Press the OK button.
▷The display shows HO 4.

11
User – Settings
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK
⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
Mo Tu We Th Fr Sa So
1/
1
OK
>1s
°C
Mode
Time
OK⇒Mo–Su
°C
°C
1
Sa–Su
1
Mo–Fr
5 Turn selector switch back to .
▷The holiday function starts immediately and ends
on Thursday at 24:00. On Friday (day 5) heating
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.
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 “----”.
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
1/
1
0 6 12 18 24
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
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 .

12
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.

13
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
06:00 – 08:00
16:00 – 22:00
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 07:00 – 23:00
07 Heating program 2 for Sunday 00:00 – 24:00
08 Operating mode direct heating circuit (HC1) ----, , 1, 2, , ----
09 Heat slope direct heating circuit 0.20 – 3.00 1,20
10 Room sensor influence
direct heating circuit OFF, 0 – 20 10
11 Room sensor correction
direct heating circuit -5 to +5 K 0
13 Operating mode mixer circuit (HC2) ----, , 1, 2, , ----
14 Heat slope mixer circuit 0.20 – 3.00 1.20
With underfloor heating set parameter 14 < 1, with radiator heating > 1.
15 Room sensor influence
Mixer circuit OFF, 0 – 20 10
16 Room sensor correction
Mixer circuit -5 to +5 K 0
18 Hot water according to program
0 = Off
1 = Heating program 1
2 = Heating program 2
3 = 1 hour before heating
4 = 24 hours hot water
1
19 Indication of heating program at the lower margin of the
display
0 = for direct heating circuit
1 = for mixed heating circuit 0

14
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. Be-
cause underfloor heating acts slower than a radiator, the underfloor
heating is to be switched on and off beforehand.
Set the general operating mode “ 1Automatic mode 1”, see page
8 (Set operating mode).
In order to use different heating times for the mixer circuit, set pa-
rameter 13 to 2 = Automatic mode 2.
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 tem-
perature 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.

15
User – Set parameters
▷Typical values:
floor heating: 0.4 to 0.8
Radiators: 1.0 to 1.5
20
20 16 12 840-4 -8 -16 -20
40
60
80
100
0,2
0,4
0,6
0,8
1
1,2
1,5
2
2,5
3
Outside temperature [°C]
Flow temperature [°C]
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 influ-
ence 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 in-
creased 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 cor-
rect 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, how-
ever, 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.)

16
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 dis-
played.
P19 = 1: The heating program for the mixed heating circuit is dis-
played.
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.

17
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 cir-
cuit, 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).

18
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
95 75
Top
57 60
Ø 3,5
AB
AB
B
B
AA
A
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.

19
Expert - Electrical connections
Heating system controller
Lago 0321
12
KF
SPF
VF
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

20
Expert - Electrical connections
Controller for a heat source in a cascade: Heating module
KF
#1
Lago 0321
#2
Lago 0321
VF SPF
KF
CAN-Bus
Merlin
This application is automatically activated as soon as you connect
a heat source sensor (KF/KFS) and set parameter 38 = 1–8 (heat-
ing 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.