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Preliminary 003
Access V4.X Configuration manual
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2019-05-13
2.2 Temperature control
Temperature controller is a closed loop system which includes measurement, processing and
adjustment.
Temperature control types
To maintain comfort temperature the controller constantly adjusts supply air temperature. It can be set
constant or variable depending on parameters of choice. Several temperature control types are
available:
Configuration > Functions > Function activation > Temperature control type >
Supply air
The supply air temperature is kept at the setpoint value by controlling the output signals. The controller
is reverse acting, i e. the output will increase for decreasing temperature.
Supply air outdoor compensated
The supply air temperature setpoint is outdoor temperature compensated using a control curve with 4
node points.
Room cascade
Cascade control of room temperature and supply air temperature to achieve a constant, settable room
temperature. The room controller output signal generates
the supply air controller’s setpoint value. The
room controller uses an own PI loops.
1..4 room sensors can be connected. The average value of selected sensors is used in the control loop.
Extract air cascade
Cascade control of extract air temperature and supply air temperature to achieve a constant, settable
room temperature. The extract air controller output signal generates the supply air controller’s setpoint
value. The extract controller used an own PI loop.
Room (summer) else supply air
Outdoor temperature dependent switching between supply air temperature control and room
temperature control.
When the outdoor temperature is lower than a settable limit (winter), outdoor compensated supply air
temperature control will be active, otherwise (summer) cascaded room temperature control as in room
cascade type.
Extract air (summer) else supply air
Outdoor temperature dependent switching between supply air temperature control and extract air
temperature control.
When the outdoor temperature is lower than a settable limit (winter), outdoor compensated supply air
temperature control will be active, otherwise (summer) cascaded extract air temperature control as in
extract air cascade type.