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Operating Modes
Manual operation
In manual mode, the ventilation level is defined by means of the level button, see section „Display and Operation" on
page 4.
Automatic operation
The automatic operation of the device is enabled once a sensor signal is detected at the input AI.
Automatic operation must be activated with the level button, see section „Display and Operation" on page 4.
IP08 defines a reset time after which the unit returns to automatic mode if it has been manually overridden. With a reset
time setting of 0, automatic reset is deactivated.
Level mode (IP00=ON)
During AUTO operation, the levels are switched by a control signal. The switching levels are defined under IP04 – IP06.
The hysteresis defined with IP07 prevents rapid switching of levels in auto mode.
Function: A level activates once the input signal exceeds the activation limit (IP04-IP06). It deactivates once the input
signal drops below the activation limit minus the hysteresis. For example, with a hysteresis of 10% and an activation limit
of 40%, the level activates with a 40% input signal and switches down to the next lower level with a 30% input signal.
Automatic switching for certain levels may be disabled by setting an activation limit of 0. The sensor signal will then not
be able to activate this particular level. This may proof useful for the highest level (boost mode) by setting IP06 = 0.
AO [%]
OP03 (Level 3)
OP02 (Level 2)
OP01 (Level 1)
OP00 (Level 0)
IP04
Figure 1: Function level mode
Continuous mode (IP00=OFF)
During AUTO operation, the ventilation is controlled gradually by the sensor signal. Instead of level steps, the output
voltage is adjusted continuously. The sensor minimum and sensor maximum of the linear range can be set with IP04 and
IP06. The output voltage then behaves linearly between OP00 and OP03.
AO [%]
OP03
OP00
IP04
Figure 3: Function continuous mode
NOTE: If the MZ3 is used in continuous mode, the following settings are recommended:
- IP04
= 20% (400 ppm)
- IP06
= 100% (2000 ppm)
Doc: 70-00-0982A V2.5, 20230123
Subject to alternation
CO2
IP05
IP06
[ppm]
AI [%]
IP06
© Vector Controls GmbH, Switzerland
www.vectorcontrols.com
AO [%]
OP03
= 100
OP02
= 60
OP01
= 40
OP00
= 20
IP04
IP05
= 800
= 1200
Figure 2: Example level mode
AO [%]
OP03
= 100
OP00
= 20
IP04
= 30
Figure 4: Example continuous mode
- OP00 = 0%
(0 V)
- OP03 = 100% (10 V)
MZ3-C-V11
IP06
CO2
= 1600
[ppm]
IP06
= 100 AI [%]
Page 5-8
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