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POLYCLIM 21A+Timer+Fog – User’s Manual
In addition, 3 operating modes are possible for the vents (with 2 sides):
1) Simultaneous operation: both sides open and close at the same time in relation to the main
setpoint. In weather safety mode, both sides open to the defined "exposed side" opening position if
necessary.
2) Operation in cascade (only possible with wind vane sensor connected): the side sheltered from the
wind opens first after the main setpoint is reached, then the exposed side (facing the wind) opens after
the main setpoint + a temperature offset is reached. During closing, the exposed side closes first, then
the sheltered side. In weather safety mode, the opening position will depend on the wind direction and
the setting of the "sheltered side" and "exposed side" opening positions.
3) Operation with priority to one side (right or left): the side with priority opens first after the main
setpoint is reached, then the other side opens after the main setpoint + a temperature offset is
reached. In weather safety mode, the side with priority opens to the "exposed side" position.
If only one side is ventilated, the operating mode must be "simultaneous".

Weather safety functions:
If there is a light wind or rain, the controller allows the vents to open up to a certain percentage.
If there is a strong wind, the vents are closed completely.
The "light wind" opening positions depend on the wind speed as shown in the following diagram:
If there is a light wind and rain, the controller uses whichever is smaller, the "Wind" opening
position or the "Rain" opening position.
Regardless of the reasons for opening (high temperature, dehumidifying, etc.), closing by the
weather safety function always has priority.
Version 3.x – February 2010 – Page 22