Zehnder EASY 5.0
60
21. Control of the hot water heating coil (BC)
21.1. Modulation of thermal output
The hot water heating coil is managed by the heating sequence and therefore has its own PID control loop which
calculates a heating requirement from the supply (or return) temperature setpoint and the measured supply (or return)
temperature. This requirement is converted into a 0-10V control signal which is used as a position setpoint for
controlling the modulating 3-way valve.
When the hot requirement is zero, the control signal is zero (0V). The hot water feed rate to the hot water heating coil is
zero.
When the hot requirement is at its maximum, the control signal is at its maximum (10V) and the hot water feed rate to
the coil is at its maximum.
21.3. Thermal output
To ensure thermal output, it is necessary to supply the heating coil with the required volume and temperature when
selecting the material.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
Control signal sent to the
3-way valve actuator
Heating requirement calculated by the heating sequence
*0V: the 3-way valve is connected in such a way that the coil is not supplied with hot water
**10V: the 3-way valve is connected in such a way that the coil is supplied with hot water
100%
10V**
0V*
0%
