wirsbo CoSy Radio User manual

Wirsbo CoSy
External temperature sensor
May. 2002
Assembly instructions
Wirsbo CoSy External temperature sensors can be used for maximum
or minimum limitation of the floor temperature, regardless of the
room thermostat settings. The setting range is 20 - 45°C and the
maximum or minimum limitation is selected with a changeover
switch inside the thermostat.
The maximum limitation can be used, for example, to prevent a
sensitive floor covering from exposure to too high a temperature
where there is a high heat demand. The minimum limitation
can be used, for example, to keep a tile floor warm even when
there is no general demand for heat supply to the room. The
minimum limitation should not be set to a value higher than
the required room temperature.
The sensing element of the sensor should be located as close as
possible to the floor surface. To protect the sensor and simplify its
replacement, the entire sensor including the sensing element, can be
installed in an conduit. If the sensing element is also placed in the
conduit allowance must be made for the disadvantages of greater
inertia and lower precision.
Fig 3 Installation in floor heating chipboard
Fig 2 Installation in loose panel
Fig 1 Embedding in concrete
the floor heating pipe, in a recess in the batten. The recess should
be made so deep that the sensing element is not deformed when
the heat emission plates and floor covering are installed, but so
that the sensing element is in contact with the plate.
When the sensor is installed in floor heating chipboard (see Fig. 3)
both the cable and sensing element can be set into a groove
which is cut into the chipboard. In all cases, avoid crossing
the floor heating pipes.
Note: Mark on the drawing where in the floor the
sensor has been installed.
If embedded in concrete (see Fig. 1), the sensing element should
be installed directly underneath a tile. When installed in a
wooden suspended floor (see Fig. 2) the sensing element can be
positioned directly underneath the heat emission plate, close to

1140S 02-02-12-V
In keeping with our policy of continuous improvement and development, Uponor
Wirsbo AB reserves the right to change specifications without prior notice.
Uponor Wirsbo AB
Box 101 Phone [phone]
SE-730 61 Virsbo Fax [phone]
Sweden www.wirsbosystems.com
Temperature drop in floor covering
The difference between the temperature on the floor surface
and the temperature of the sensor depends on the heat flow and
heat resistance in the intermediate layers. Moreover, there is a
temperature variation in the layer between the pipes.
t = q(d1/1+ d2/2+…)
t = temperature difference °C
q = heat output, W/m²
d = thickness, m
= thermal conductivity, W/m°C
Calculation example
Required maximum floor surface temperature 27°C, installation
in a wooden suspended floor with heat emission plates, 55 W/m²,
floor covering consisting of 22 mm chipboard, = 0,14 W/m°C
and 7 mm laminate, = 0,12 W/m°C.
t = 55 (0,022/0,14 + 0,007/0,12) = 11,9°C
The temperature on the underside of the chipboard should not
therefore exceed 27 + 11.9 = 38.9 °C.
In view of temperature variations in the horiziontal direction in
the floor and the drop in temperature between the chipboard
and the temperaure sensor, the maximum limitation is set at
approximately 40°C.
Technical data
Length: 3 m
Sensor element: NTC, resistance
Precision: +/- 0,2°C @ 0°C to 70°C
Power consumption (25°C): < 75mW
Thermal time constant: < 10 secs. in stationary air.
Article numbers
Please note that not all items are available on every market
concerned.
Sensor, separate:
Wirsbo CoSy External temperature sensor, 3 m, Art no 80463
The sensor can be connected to:
Wirsbo CoSy Room thermostat, Public, 24V, Art no 80464 and
Wirsbo CoSy Room thermostat, Switch, 24V, Art no 80465
Thermostat, complete with sensor:
Room thermostat with temperature lowering, including external
sensor Art no 804651
Resistance , kV
Temperature, °C
Resistance of the temperature sensor
Fig 4
Fig 5 Electrical connection and settings
11 12
2 3 4 5 6
20 45
25 40
30 35 Setting button for max or min. limitation.
Adjustment knob for the limitation temperature of the external
temperature sensor.
The external temperature sensor is connected to terminal 11
and 12.The sensor can be extended by a maximum of 5 metres,
using 0.5 mm2 cable. Joining cables must be carried out safely,
e.g. in a box on the wall.