Technical data
33  CTC EcoZenith i250
General Information
8.7  Settings
This menu is used to set the parameters for your 
home's heating requirements. It is important that this 
default setting is adjusted for your property. Values 
which are set incorrectly may mean that your property is 
not warm enough or that an unnecessarily large amount 
of energy is being used to heat your property. 
8.7.1  Radiator system 1 or 2
Max. primary flow
The maximum permitted temperature supplied to the 
radiators. This functions as an “electronic” limiter to 
protect floor circuits in underfloor heating systems.
Radiator system 2 can only give the same temperature 
as radiator system 1 or a lower temperature.
Min primary flow
You can use this option to set the minimum permitted 
temperature if you want a specific level of background 
heating during the summer in the basement or 
underfloor circuits, e.g. in the bathroom. The heating in 
other parts of your property should then be switched 
off using thermostatic radiator valves or shut-off valves. 
Note that the radiator pump will operate the whole 
summer. This means that the temperature out to the 
radiators does not fall below a selected temperature, for 
example +27°C. 
“Off” means that the function is turned off.
Heating off, out
Outdoor temperature limit at which the house no 
longer requires heating. The radiator pump stops and 
the mixing valve is kept closed. The radiator pump is 
activated daily for a short period so that it does not 
jam. The system restarts automatically when heating is 
required. 
Heating off, minutes
The delay period before the radiator pump stops as 
described above.
Inclination (default setting)
Inclination means the temperature your property needs 
at different outdoor temperatures. See more detailed 
information about this in the chapter on Your property’s 
heating installation. The value set is the outgoing flow 
temperature to radiators when the outdoor temperature 
is -15 °C. After this default setting, fine adjustment takes 
place in the “Room temperature” menu.
For example:
“Inclination 50” means that the temperature of the water 
supplied to the radiators will be 50°C when the outdoor 
temperature is -15°C, if the adjustment is set to 0. If the 
adjustment is set to +5, the temperature will be 55°C 
instead. The curve is increased by 5°C at all outdoor 
temperatures, i.e. the curve is parallel offset by 5°C.
!
Tip: Read more about these settings 
in the chapter on Your property’s 
heating installation.
 Svenska  Nederlands  English  Deutsch
 Suomi  Française  Dansk  Norsk
1 2
1 2
  22,2 ºC  21,2 ºC  58 ºC  -5 ºC
1 2
1 2
1 2
  06 - 09  18 - 21
  07 - 09  20 - 23
  06 - 09  10 - 21
 06 - --  -- - 21
 06 - --  -- - 21
  10 - 12  20 - 23
  10 - 12  20 - 23
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
06-09 18-21
07-09 00-00
06-09 00-00
06-09 00-00
06-09 00-00
10-12 00-00
10-12 00-00
  Room temp.  DHW  Operation  Installer
CTC EcoZenith  Monday 09:35
Night reduction Holiday
Heating circuit 2 (50)
Heating circuit 1
Room temp.
Start menu
Room temperature settings
Selecting DHW comfort
Heating system data
Installer settings menu
Extra
Hot water 
0.0 hours
On
Temperature
Normal
Weekly schedule
DHW
Weekly program  Day by day
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program DHW
Operation data system
Status  HP upper tank
Tank upper°C  49 (60)
Tank lower°C  42 (45)
Primary flow°C  42 (43)
Return flow°C  34
Radiator pump  On
Mixing valve  Open
Delay mixing valve  180
Electric power kW  0.0 0.0 0.0
Current L1/L2/L3  0.0 0.0 0.0
Operation data EcoZenith
Stored oper data
Heating circuit 2
Operation data heating
Installer
Time/Language  Settings  Define system  Service
Software display PCB:  20120205
Software HP PCB:  20120125
Installer
Installer
Time 21:34
Date 2012-02-05
Settings
Heating circuit
Heating circuit 1
Heating circuit 2
Heat pump
Electric heater
Upper tank
Remote control  NR
Communication
Save settings
Load settings
Load factory settings
Max primary flow°C  55
Min primary flow°C  Off
Heating off, out°C  18
Heating off  120
Inclination°C 50
Adjustment°C 0
Room temp reduced°C  -2
 or
Primary flow reduced°C  -3
Define system
Def heating circuit
Heating circuit 1
Heating circuit 2
Heat pump
SMS
Cooling
Heating circuit 1  Yes
Room sensor 1  Yes
Type Wire
Service
Function test
Function test
Alarm log
Factory settings coded
Quick start compressor.
Software update, USB
Write log to USB
Control current sensors
Re-installation
Heating circuit 
Heat pump
Valves
Electric heater
Total operation time h:  14196
Max primary flow°C:    51
Consumtion kWh    20
Compressor:
 Operation time /24 h:m  00:00
Stored oper data
Heat pump
Compressor On
Charge pump  On 47%
Brine pump  On
HP in/out°C  35.5 / 42.3
Current L1  4.0
Night reduction heat circ.
Weekly program  Day by day  NR
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Night reduction heat circ.
Weekly program  Block  NR
Decrease  Sunday 22:00
Increase  Friday 14:00
Decrease  -------- 00:00
Increase  -------- 00:00
Holiday
Holiday period  3 days
Out  Room1 Prim1  Return Room2  Prim2
 Svenska  Nederlands  English  Deutsch
 Suomi  Française  Dansk  Norsk
1 2
1 2
  22,2 ºC  21,2 ºC  58 ºC  -5 ºC
1 2
1 2
1 2
  06 - 09  18 - 21
  07 - 09  20 - 23
  06 - 09  10 - 21
 06 - --  -- - 21
 06 - --  -- - 21
  10 - 12  20 - 23
  10 - 12  20 - 23
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
06-09 18-21
07-09 00-00
06-09 00-00
06-09 00-00
06-09 00-00
10-12 00-00
10-12 00-00
  Room temp.  DHW  Operation  Installer
CTC EcoZenith  Monday 09:35
Night reduction Holiday
Heating circuit 2 (50)
Heating circuit 1
Room temp.
Start menu
Room temperature settings
Selecting DHW comfort
Heating system data
Installer settings menu
Extra
Hot water 
0.0 hours
On
Temperature
Normal
Weekly schedule
DHW
Weekly program  Day by day
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program DHW
Operation data system
Status  HP upper tank
Tank upper°C  49 (60)
Tank lower°C  42 (45)
Primary flow°C  42 (43)
Return flow°C  34
Radiator pump  On
Mixing valve  Open
Delay mixing valve  180
Electric power kW  0.0 0.0 0.0
Current L1/L2/L3  0.0 0.0 0.0
Operation data EcoZenith
Stored oper data
Heating circuit 2
Operation data heating
Installer
Time/Language  Settings  Define system  Service
Software display PCB:  20120205
Software HP PCB:  20120125
Installer
Installer
Time 21:34
Date 2012-02-05
Settings
Heating circuit
Heating circuit 1
Heating circuit 2
Heat pump
Electric heater
Upper tank
Remote control  NR
Communication
Save settings
Load settings
Load factory settings
Max primary flow°C  55
Min primary flow°C  Off
Heating off, out°C  18
Heating off  120
Inclination°C 50
Adjustment°C 0
Room temp reduced°C  -2
 or
Primary flow reduced°C  -3
Define system
Def heating circuit
Heating circuit 1
Heating circuit 2
Heat pump
SMS
Cooling
Heating circuit 1  Yes
Room sensor 1  Yes
Type Wire
Service
Function test
Function test
Alarm log
Factory settings coded
Quick start compressor.
Software update, USB
Write log to USB
Control current sensors
Re-installation
Heating circuit 
Heat pump
Valves
Electric heater
Total operation time h:  14196
Max primary flow°C:    51
Consumtion kWh    20
Compressor:
 Operation time /24 h:m  00:00
Stored oper data
Heat pump
Compressor On
Charge pump  On 47%
Brine pump  On
HP in/out°C  35.5 / 42.3
Current L1  4.0
Night reduction heat circ.
Weekly program  Day by day  NR
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Night reduction heat circ.
Weekly program  Block  NR
Decrease  Sunday 22:00
Increase  Friday 14:00
Decrease  -------- 00:00
Increase  -------- 00:00
Holiday
Holiday period  3 days
Out  Room1 Prim1  Return Room2  Prim2










