Floor limit sensor - WlCt3, WlDt3 and WltD3
© 2015 OJ Electronics A/S
54
Room sensors/controllers with a limit sensor have a mechanical jumper on the printed circuit board
allowing limits to be set for MIN. or MAX. temperature control. If set for MAX., the limit setting will be
27°C. If set for MIN., the limit setting will be 17°C. These temperatures are fixed when used with WLM3-
xBA masters unless the room sensor has been allocated to a zone group controlled by a WLCT3 room
controller. In this case, the limit settings can be increased or decreased via the room controller. The limits
then set will apply to all room sensors with floor limit sensors belonging to that group. If a WLM3-xFS
master is used, the limit settings can be changed using the programming buttons on the master.
Mounting of floor sensor
Max. temperature
limitation is used to protect the floor area from becoming too warm. This may be
required if special floor surfaces (e.g. real wood) are used. The sensor should be positioned where it can
read the true temperature of the floor and should always be within the heated area.
Min. temperature
limitation is used to keep the floor surface warm, irrespective of room temperature. In
tiled bathrooms or pool areas, for example, water will dry more quickly if the floor surface is kept warm.
The sensor should be positioned where it can read the true temperature of the floor and should always be
within the heated area.
To ease replacement, we recommend that all floor sensors are mounted in a tube positioned between
two heating pipes. The inner end of the tube should be sealed, and the floor sensor cable led back to the
bottom of the wall. If required, the sensor cable can be extended up to 50 m with a standard installation
cable.
WltM3: using an external room sensor
An external room sensor can be used instead of the built-in sensor by connecting the jumper across the
two-pin bridge on the printed circuit board beneath the
room sensor cover. From the factory, the jumper is “parked” on one pin. Jumper location, see fig. 4.
Jumper mounted: max. limitation
Jumper removed: min. limitation
Fig. 4
BR1026A09
a
© 2015 OJ Electronic
A/
S
Channal
selector
-G
B
Jumper
Button learning
mode
BR1026A09a
The room sensors use 2 x AAA alkaline batteries. A lifetime of 1-2 years is expected. The room sensors are
equipped with a low battery alarm which beeps every 5 minutes in case of low battery. If a room sensor
is defective, or communication to the unit is interrupted, an alarm will be triggered on the master, and the
room will be heated constantly at 20% output for safety. The alarm can be overruled during the next 24
hours. Press the clock symbol on the room controller for 2 seconds. On the other room sensors, remove the
front cover and press the small learning mode button for 2 seconds.
technical specifications
See the Waterline Wired/Wireless Room Sensors Instructions
Batteries (wireless)
Summary of Contents for WLM3
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