USER INSTRUCTIONS
24
FAN COIL WITH ON-OFF SPEED CONTROL
The operating principle involves activating/deactivating the fan coil speeds on the basis of
the difference between the fixed setpoint and the detected temperature, using independent
1-bit communication objects to manage the individual speeds.
The figures below refer to the control of the speeds of a fan coil with three operating stages
for heating and cooling. The charts show that each stage has a hysteresis cycle, and each
speed is associated with two thresholds that determine its activation and deactivation.
3cond
valve
2cond
1cond
valve ON
valve OFF
fan OFF
set-point
valve OFF
valve ON
1heat
valve
2heat
3heat
set-point
fan OFF
A
IR
-
CONDITIONING
H
EATING
