Technical data

73
CTC EcoZenith i250
Installation
14.5 Extra low voltage protection
The following outputs and inputs have extra low voltage protection: current
sensor, outdoor sensor, room sensor, primary flow sensor, return sensor,
NR/SO, temperature sensor, level switch and PWM signals.
Connection of outdoor sensor (B15)
The sensor should be set up on the house’s northwest or north side, so that
it is not exposed to morning and evening sun. If there is a risk of the sensor
being affected by the sun’s rays, it must be protected by a screen.
Place the sensor at around 2/3 of the height of the facade near a corner, but
not under a roof projection or other form of wind protection. Do not place it
either above ventilation ducts, doors or windows where the sensor may be
affected by factors other than the actual outdoor temperature.
Connection of room sensor (B11) (B12)
The room sensor is fitted at a central point in the house, in the most open
position possible, ideally in a hall between several rooms. This is the best
position for the sensor to record an average temperature for the house.
Feed a three-conductor cable (minimum 0.5 mm
2
) between the heat pump
and room sensor. Then attach the room sensor securely in a position at
roughly two thirds of the way up the wall. Connect the cable to the room
sensor and EcoZenith.
Connection of primary flow sensor (B1, B2) /return sensor
(B7)
Fit the primary flow sensor to the primary flow pipe, ideally after the
circulation pump. Fit the return sensor to the return pipe.
The sensing part is towards the end of the sensor (see sketch).
Contact paste Sensory element Sensors
Primary flow pipe Tie strap Insulation
Sensor cable
!
Do not attach the
sensor cable perma-
nently until you have
tested where the
best location is.
• Attach the sensor using the tie strap provided.
• Ensure that the sensor makes good contact with the pipe.
Apply contact paste to the front part of the sensor between the sensor
and the pipe if good contact is otherwise difficult to obtain.
• Important! Insulate the sensor using pipe insulation.
• Connect the cables to the EcoZenith’s terminal board.