Operating the Control
The
ZG 215VN
can be used at choice for the control of an
air-handling system’s constant discharge temperature (left-
hand system diagram) or a floor heating’s constant flow tempe-
rature (right-hand system diagram).
The
VF/LF
temperature sensors monitor constantly the actual va-
lues and transmit these values to the
ZG
control unit. Should the “
temperature or the supply temperature deviate from the target va-
lue, the controller commands the
VM
servo motor to adjust the
ZR/DR
mixing valve.
The mixing valve performs the necessary change to the mixing ra-
tio between the heated supply water and the heating circuit’s retur-
ning cooled water.
The
TW
temperature selector is used as remote control. By means
of the
P2
selector knob the flow or supply temperature can be mo -
dified. The temperature selector is not absolutely necessary in
functional terms, but it makes the operation easier.
The
FT
frost protection thermostat (air-handling system only)
works independently from the control unit and protects the air hea-
ter against freezing.
