Installation instructions
47
DHW sensor
: When the control system is used in DHW systems with an external heat exchanger and
speed-controlled pump, changes in the amount of water have to be
reacted to quickly
. Hence, the
DHW sensor has to be put directly on the heat exchanger’s outlet. A T-shaped connector should be
used to insert the ultrafast sensor (special accessory) in the outlet using an O-ring. The heat ex-
changer has to be installed upright with the warm water outlet on top.
Radiation sensor:
To get a measurement according to the collector’s position, it should be parallel to
the collector. It should thus be screwed onto the metal sheet or next to the collector along an expan-
sion of the assembly rail. To this end, the sensor case has a blind hole that can be opened at any
time. The sensor is also available as a wireless sensor.
Room sensor:
This sensor is intended for installation in the living room (as a reference room). The
room sensor should not be installed near a source of heat or near a window. The sensor is also avail-
able as a wireless sensor.
Outdoor temperature sensor:
This sensor is installed on the coldest wall side (usually the north)
some two meters above ground.
Avoid temperature influences from nearby air shafts, open windows,
etc.
Sensor lines
All of the sensor lines with a cross-section of 0.5mm2 can be extended up to 50m. With this length of
line and a Pt1000 temperature sensor, the measurement error is approx. +1K. Longer lines or a lower
measurement error require an appropriately larger cross-section. The sensor and the probe can be
connected by putting the heat-shrinkable sleeve truncated to 4 cm over a wire and twisting the bare
ends. If one of the wire ends is tinned then the connection must be made through soldering. Then the
heat-shrinkable sleeve is put over the bare, twisted ends and carefully heated (such as with a lighter)
until it has wrapped the connection tightly.
In order to prevent measurement fluctuations, the sensor cables must not be subject to negative
external influences to ensure fault-free signal transmission. When using non-screened cables, sensor
cables and 230V network cables must be laid in separate cable channels and at a minimum distance
of 5 cm. If screened cables are used, the screen must be connected to the sensor earth (GND).
