Technical data
34
CTC EcoZenith i250 
General Information
8.7  Settings
This is used to set the parameters for operating 
the system. 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  Heating circuit 1 or 2
Max. primary flow  55(30...80)
The maximum permitted temperature supplied to the 
radiators. This functions as an electronic limiter to 
protect the floor coils in underfloor heating systems.
Radiator system 2 can only reach the same temperature 
as radiator system 1 or a lower temperature.
Min. primary flow  Off (Off, 15...65)
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 heating coils, 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 then operate 
for 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, outside  18(10...30)
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 to reduce the risk 
of jamming. The system restarts automatically when 
heating is required. 
Heating off, minutes  120(30...240)
The delay period before the radiator pump stops as 
described above.
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
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  23 - 24
00 - 08   23 - 24
00 - 08   22 - 24
06 - 09  18 - 21
07 - 09  -- - --
08 - 09  -- - --
08 -  --  --  - 21
08 -  --  --  - 21
10 - 12   20 - 23
10 - 12   20 - 23
  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
Operation data system
Status HP upper tank
Tank upper°C    49 (58)
Tank lower°C    42 (45)
Electric power kW    0.0+2.5
Current L1/L2/L3 0.0 0.0 0.0
Diff func. Pump / ºC    On 32
Pool ºC Off 22(20)
Operation data EcoZenith
Stored oper data
Heating circuit
Operation data heating
Installer
Time/Language  Settings  Define system  Service
Software display PCB:  20120205
Software HP PCB:  01234
Installer
Installer
Time 21:34
Date 2012-02-05
Settings
Heating circuit 1
Heating circuit 1
Heating circuit 2
Heat pump
Electric heater
Upper tank
Remote control  None
Communication
Solar panels
Diff thermostat function
Pool
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 1
Heating circuit 1
Heating circuit 2
Heat pump
CTC SMS
Cooling
Solar panels
Diff thermostat function  No
Pool (G50, G51, B50)    No
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
Solar
Diff thermostat function
Pool
Total operation time h:  14196
Max primary flow°C:    51
Consumtion kWh    20
Compressor:
 Total Operation time    1540
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  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
Settings language
Night reduction heat circ. 1
Weekly program  Day by day  NR
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program  Day by day  DHW
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program DHW
 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
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  22 - 24
00 - 06  23 - 24
00 - 08   23 - 24
00 - 08   22 - 24
06 - 09  18 - 21
07 - 09  -- - --
08 - 09  -- - --
08 -  --  --  - 21
08 -  --  --  - 21
10 - 12   20 - 23
10 - 12   20 - 23
  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
Operation data system
Status HP upper tank
Tank upper°C    49 (58)
Tank lower°C    42 (45)
Electric power kW    0.0+2.5
Current L1/L2/L3 0.0 0.0 0.0
Diff func. Pump / ºC    On 32
Pool ºC Off 22(20)
Operation data EcoZenith
Stored oper data
Heating circuit
Operation data heating
Installer
Time/Language  Settings  Define system  Service
Software display PCB:  20120205
Software HP PCB:  01234
Installer
Installer
Time 21:34
Date 2012-02-05
Settings
Heating circuit 1
Heating circuit 1
Heating circuit 2
Heat pump
Electric heater
Upper tank
Remote control  None
Communication
Solar panels
Diff thermostat function
Pool
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 1
Heating circuit 1
Heating circuit 2
Heat pump
CTC SMS
Cooling
Solar panels
Diff thermostat function  No
Pool (G50, G51, B50)    No
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
Solar
Diff thermostat function
Pool
Total operation time h:  14196
Max primary flow°C:    51
Consumtion kWh    20
Compressor:
 Total Operation time    1540
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  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
Settings language
Night reduction heat circ. 1
Weekly program  Day by day  NR
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program  Day by day  DHW
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Weekly program DHW










