Technical data

74
CTC EcoZenith i250
Installation
L1
L2
L3
1
2
3
4
1
2
3
4
From electricity meter
Current sensor Fuse panel
To boiler
Low current
Connection block
Use at least 0.5 mm
2
cable.
L1
L2
L3
1
2
3
4
1
2
3
4
14.5.1 Remote-controlled temperature reduction
The night temperature reduction function can be activated via a closed
function on the electricity remote control input, pins G33 and G34 on the
terminal board. The function can be controlled remotely using “Minicall”, for
instance.
While the input is short circuited, the temperature reduction is activated,
regardless of other settings. When the short circuit ceases, the product
returns to ordinary settings.
The size of the reduction is set in the menu: Installer/Settings/Radiator
system/Prim reduced.
NOTE: the input function can be selected according to the following:
NR = Night reduction of temperature (time-controlled lowering of
temperature)
SO = Shut off (compressor and power output blocked by the electricity
supplier)
DHW = Extra hot water button (accessory)
14.5.2 Current sensor connection
The three current sensors, one for each phase, are fitted on the fuse panel in
the following manner.
Each phase from the electricity distribution board supplying the EcoHeat
is channelled through a current sensor before termination at the relevant
terminal. This allows the phase current to be sensed all the time and
compared with the value set for the heat pump's load switch. If the current
is higher, the control unit drops to a lower heat output on the immersion
heater. If this is insufficient, the heat pump is also limited. When the power
drops back to the set value, the heat pump and immersion heater are
reconnected.
This means that the current sensors, along with the electronics, prevent
more power being supplied than the main fuses can tolerate.
The current sensors’ holes for cables are 11 mm in diameter.