2.2 Installing the sensors
2.2.1 Outdoor sensor
Use two screws to mount the outdoor sensor to the outside wall at an appropriate place. Make
sure that the sensor is mounted away from direct heat sources (windows, vents etc.). In case of
single family dwellings, preferably mount the sensor on the wall at the side of the house where
the most frequently occupied rooms are situated.
2.2.2 Flow/return flow sensor
Mount the sensor as duct sensor or surface sensor in an easily accessible location near the con-
trol valve:
Duct sensor:
Insert the duct sensor into a thermowell as far as it will go.
Surface sensor:
Remove insulation from the flow pipe where the sensor is to be mounted and
polish the pipe clean. Firmly press the sensor onto the pipe and secure it to the pipe using the en-
closed tightening strap.
2.2.3 Room sensor
Mount the sensor on the wall approx. 150 cm above the floor at an appropriate place. Make
sure that the air circulation is not obstructed by cupboards, curtains or similar items.
3. Electrical connections
3.1 General
CAUTION!
For wiring and connection of the controller, you are required to observe the VDE
regulations and the regulations of the local power supply company. For this reason,
this type of work must be carried out by a specialist.
•
Use separate cables for 230 V supply line and the signal lines!
•
Also use separate cables for the digital signal lines (bus lines) and the analog signal lines
(sensor lines).
•
In systems with a high electromagnetic noise level, we recommend that shielded cables be
used for the analog signal lines.
Ground the shield at the inlet or outlet of the control cabinet, using the largest possible cross
section and via the shortest possible route.
The central grounding point must be connected to the grounding conductor using a min.
10 mm
2
cable.
As a rule, the shield needs only be grounded on one side at the control cabinet inlet, except
when an equipotential bonding exists that has much lower resistance than the shield resist-
ance.
•
To increase the noise immunity, make sure that there is a minimum distance of 10 cm be-
tween the power cables and signal lines. We recommend that this distance between these
lines is also kept in the control cabinet!
•
Inductances in the control cabinet, e.g. contactor coils, must be equipped with suitable inter-
ference suppressors (RC elements)!
Control cabinet elements with a high field strength, e.g. transformers or frequency conver-
ters, should be shielded by means of separators that have good chassis ground.
!
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