Zehnder EASY 5.0
53
19.1. General
For all machine versions, the speed of the fans is controlled via an analogue 0-10V control signal directly from the
controller.
The fans start at a control voltage of 1V (minimum speed) and stop at a voltage below 1V. The maximum speed is
achieved when the control voltage = 10V.
Between 1 and 10V, the fan speed is proportional to the command signal.
The fan operation control is done either by:
■
Pressure switch for ECO / DIVA versions factory set at 25 Pa.
■
Pressure transducers for LOBBY versions (25Pa threshold set in the CLD-283 controller)
■
Volume transducers (differential pr K factor) for MAC2 / QUATTRO versions (variable threshold set in the
CLD-283 controller in accordance with the AHU model, see XV.11 Fan feedback and difference thresholds).
19.2. ECO controller
The ECO controller is an open loop control of the speed of the supply and exhaust air fans; there is no regulation. A
speed setpoint (0-10V signal), which depends on the time schedule, is sent directly to the fan. The actual air volume or
pressure at the supply or return is a result of the pressure/volume curve of the fan and the network curve.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
Fan speed
Control signal
Max*
Min*
Off
0V 1V
10V
*The max and min speeds depend on the fan model.
Return air
Fresh air (outdoor)
Exhaust air
Supply air
VAS
VAR
DEP S
Setpoint
speed
Setpoint speed
VAS
Setpoint speed
VAR
Setpoint
speed
DEP R
Pa
Volume flow HS
Volume flow LS
Volume flow
