Operation as an Air-handling Control
(fig. left both)
The operation of the air-handling control is basically the same as
for warm water heating. Instead of the flow temperature, the air
temperature in the supply duct is measured.
The control unit calculates the necessary heat demand and regula-
tes the drive motor so that the desired room temperature is reached.
Depending on the layout of the air-handling system, the drive mo-
tor operates on a different part of the system:
n
In case of a mixing chamber system the blinds for the inco-
ming and outgoing air are set.
n
In case of heating coil control the hot water temperature is
set for air heating.
In both of types of system, the supply of heat is regulated so that the
room temperature set with the temperature selector is maintained.
