Technical data
41  CTC EcoZenith i250
General Information
HP Brine pump/Fan.
Brine pump On/Off. Activation of the fan or brine pump. 
EcoAir: the fan can be adjusted 0-100%
HP Charge pump
Charge pump On/Off. Function test 0-100%.
Manual defrosting (Only applies to CTC EcoAir) 
Manual defrosting function test On/Off 
Compressor heater (Only applies to CTC EcoAir) 
Compressor heater function test On/Off .
Heater condensation tray (Only applies to CTC 
EcoAir) 
Heater condensation tray function test On/Off .
Heating cable (Only applies to CTC EcoAir) 
Heating cable function test. (Accessory) On/Off 
4-way valve (Only applies to CTC EcoAir) 
4-way valve function test On/Off . 
Valves
Function test carried out on the flow conditioner. This 
involves testing the flow Up or Down (upper and lower 
parts of the tank respectively).
Alarm log 
You can use this to read information about the latest 
alarms. The latest alarm is displayed at the top and the 
four latest alarms are shown under Stored alarms.
An alarm which reoccurs within an hour is ignored so 
as not to fill up the log. If all the alarms are the same, 
this can indicate that there is an intermittent fault, e.g. a 
loose contact.
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
Room temp.
Heating circuit 1
Night reduction Holiday
Room temp.
Heating circuit 1 (50)
Night reduction Holiday
Heat pump
Compressor Permitted
Min outdoor temp °C  -15
Brine pump on 10 days  0
Tariff HP  Off
Minimum run time  6
Electric heater
Boiler upper°C  50
Boiler upper add°C  57
Boiler upper extra DHW°C  60
Boiler upper max kW  5.5
Boiler lower °C  55
Boiler lower max kW  6.0
Delay mixing valve  180
Main fuse A  25
Input voltage  3x400 V
Upper tank
Stop temp HP°C  Max
Start/stop diff upper ºC  7
Max time upper tank  20
Max time lower tank  40
Communication
MB address  1
Baud rate  9600
Parity  even
Stop bit  1
Save settings
Save settings?
Def Heat pump
Heat pump  Off
Flow/level switch  None
Test Heating circuit
Mixing valve1  Open
Rad pump1  On
Mixing valve2  Off
Rad pump2  Off
LED room sensor  On
Test valves
Test Elec.heater
3-way valve  Down
Electric heater L1A  Off
Electric heater L1B  Off
Electric heater L2A  Off 
Electric heater L2B  Off
Electric heater L3A  Off
Electric heater L3B  Off
Electric heater A13  Off
Alarm log 
Latest alarm:  Time  HP (b)  LP (b)  SH (K)  I(A)
Low brine flow  07:20 6/3  8.8  3.3  15.9  3.9
Stored alarms:
Wrong phase order  10:30 1/3  27.9  8.6  -227  50.0
Comm. error motor protect  09:01 1/3 27.9  3.6  42.2 
0.0
Factory settings coded
Code  0 0 0 0
Upper tank 
Lower tank
Compressor operation
Expansion valve
Log compressor stop
Operation data heating 2
Out  Room1 Prim1  Return Room2  Prim2
Test Heat pump
HP Compr.  Off
HP Brine p/Fan  Off
HP Charge p  0
Defrost Manually  Off
Compressor heat  Off
Drip tray heater  Off
Heating Cable  Off
4-way valve(Y11)  Off
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
Room temp.
Heating circuit 1
Night reduction Holiday
Room temp.
Heating circuit 1 (50)
Night reduction Holiday
Heat pump
Compressor Permitted
Min outdoor temp °C  -15
Brine pump on 10 days  0
Tariff HP  Off
Minimum run time  6
Electric heater
Boiler upper°C  50
Boiler upper add°C  57
Boiler upper extra DHW°C  60
Boiler upper max kW  5.5
Boiler lower °C  55
Boiler lower max kW  6.0
Delay mixing valve  180
Main fuse A  25
Input voltage  3x400 V
Upper tank
Stop temp HP°C  Max
Start/stop diff upper ºC  7
Max time upper tank  20
Max time lower tank  40
Communication
MB address  1
Baud rate  9600
Parity  even
Stop bit  1
Save settings
Save settings?
Def Heat pump
Heat pump  Off
Flow/level switch  None
Test Heating circuit
Mixing valve1  Open
Rad pump1  On
Mixing valve2  Off
Rad pump2  Off
LED room sensor  On
Test valves
Test Elec.heater
3-way valve  Down
Electric heater L1A  Off
Electric heater L1B  Off
Electric heater L2A  Off 
Electric heater L2B  Off
Electric heater L3A  Off
Electric heater L3B  Off
Electric heater A13  Off
Alarm log 
Latest alarm:  Time  HP (b)  LP (b)  SH (K)  I(A)
Low brine flow  07:20 6/3  8.8  3.3  15.9  3.9
Stored alarms:
Wrong phase order  10:30 1/3  27.9  8.6  -227  50.0
Comm. error motor protect  09:01 1/3 27.9  3.6  42.2 
0.0
Factory settings coded
Code  0 0 0 0
Upper tank 
Lower tank
Compressor operation
Expansion valve
Log compressor stop
Operation data heating 2
Out  Room1 Prim1  Return Room2  Prim2
Test Heat pump
HP Compr.  Off
HP Brine p/Fan  Off
HP Charge p  0
Defrost Manually  Off
Compressor heat  Off
Drip tray heater  Off
Heating Cable  Off
4-way valve(Y11)  Off
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
Room temp.
Heating circuit 1
Night reduction Holiday
Room temp.
Heating circuit 1 (50)
Night reduction Holiday
Heat pump
Compressor Permitted
Min outdoor temp °C  -15
Brine pump on 10 days  0
Tariff HP  Off
Minimum run time  6
Electric heater
Boiler upper°C  50
Boiler upper add°C  57
Boiler upper extra DHW°C  60
Boiler upper max kW  5.5
Boiler lower °C  55
Boiler lower max kW  6.0
Delay mixing valve  180
Main fuse A  25
Input voltage  3x400 V
Upper tank
Stop temp HP°C  Max
Start/stop diff upper ºC  7
Max time upper tank  20
Max time lower tank  40
Communication
MB address  1
Baud rate  9600
Parity  even
Stop bit  1
Save settings
Save settings?
Def Heat pump
Heat pump  Off
Flow/level switch  None
Test Heating circuit
Mixing valve1  Open
Rad pump1  On
Mixing valve2  Off
Rad pump2  Off
LED room sensor  On
Test valves
Test Elec.heater
3-way valve  Down
Electric heater L1A  Off
Electric heater L1B  Off
Electric heater L2A  Off 
Electric heater L2B  Off
Electric heater L3A  Off
Electric heater L3B  Off
Electric heater A13  Off
Alarm log 
Latest alarm:  Time  HP (b)  LP (b)  SH (K)  I(A)
Low brine flow  07:20 6/3  8.8  3.3  15.9  3.9
Stored alarms:
Wrong phase order  10:30 1/3  27.9  8.6  -227  50.0
Comm. error motor protect  09:01 1/3 27.9  3.6  42.2 
0.0
Factory settings coded
Code  0 0 0 0
Upper tank 
Lower tank
Compressor operation
Expansion valve
Log compressor stop
Operation data heating 2
Out  Room1 Prim1  Return Room2  Prim2
Test Heat pump
HP Compr.  Off
HP Brine p/Fan  Off
HP Charge p  0
Defrost Manually  Off
Compressor heat  Off
Drip tray heater  Off
Heating Cable  Off
4-way valve(Y11)  Off
1 2
1 2
T ºC
60
40
20
0
-20
16  20  0  4  8 12
Room temp.
Heating circuit 1
Night reduction Holiday
Room temp.
Heating circuit 1 (50)
Night reduction Holiday
Heat pump
Compressor Permitted
Min outdoor temp °C  -15
Brine pump on 10 days  0
Tariff HP  Off
Minimum run time  6
Electric heater
Boiler upper°C  50
Boiler upper add°C  57
Boiler upper extra DHW°C  60
Boiler upper max kW  5.5
Boiler lower °C  55
Boiler lower max kW  6.0
Delay mixing valve  180
Main fuse A  25
Input voltage  3x400 V
Upper tank
Stop temp HP°C  Max
Start/stop diff upper ºC  7
Max time upper tank  20
Max time lower tank  40
Communication
MB address  1
Baud rate  9600
Parity  even
Stop bit  1
Save settings
Save settings?
Def Heat pump
Heat pump  Off
Flow/level switch  None
Test Heating circuit
Mixing valve1  Open
Rad pump1  On
Mixing valve2  Off
Rad pump2  Off
LED room sensor  On
Test valves
Test Elec.heater
3-way valve  Down
Electric heater L1A  Off
Electric heater L1B  Off
Electric heater L2A  Off 
Electric heater L2B  Off
Electric heater L3A  Off
Electric heater L3B  Off
Electric heater A13  Off
Alarm log 
Latest alarm:  Time  HP (b)  LP (b)  SH (K)  I(A)
Low brine flow  07:20 6/3  8.8  3.3  15.9  3.9
Stored alarms:
Wrong phase order  10:30 1/3  27.9  8.6  -227  50.0
Comm. error motor protect  09:01 1/3 27.9  3.6  42.2 
0.0
Factory settings coded
Code  0 0 0 0
Upper tank 
Lower tank
Compressor operation
Expansion valve
Log compressor stop
Operation data heating 2
Out  Room1 Prim1  Return Room2  Prim2
Test Heat pump
HP Compr.  Off
HP Brine p/Fan  Off
HP Charge p  0
Defrost Manually  Off
Compressor heat  Off
Drip tray heater  Off
Heating Cable  Off
4-way valve(Y11)  Off
Immersion heater
You use this function to test the immersion heater’s 
phases: L1, L2 and L3. 
The modes available are On/Off










