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Setting the parameters
The MZ3 is designed to work for most comfort ventilation applications. It is
however possible to fine tune it to fit perfect into the application at hand.
The parameters can be changed during operation through an operation unit
called OPA-S. The operating unit OPA-S must be connected for the
adjustment of the parameters with the MZ3.
Carefully lift the front panel of the MZ3 and pull it away to the front. Plug the
connecting cable of the OPA-S operating unit into the rear part of the MZ3.
Important
The MZ3 does not accept the new settings until the OPA-S parameter menu is exited. The connection must not be
disconnected earlier than five seconds after the last keystroke!
Copy parameters
It is now possible to copy settings to an accessory (AEC-PM2) and to copy them back to
other MZ3. For this, remove the front panel of the MZ3, insert AEC-PM2 in the
designated plug.
Copy parameters from MZ3 to AEC-PM2
Connect OPA-S and copy parameters from MZ3 to AEC-PM2 by setting OP06 to 1. The
"Data" LED of the AEC-PM2 lights up for 5 seconds after successful parameter copying
and OP06 is set to 0. If parameter copying has failed, the LED flashes for 5 seconds and
OP06 is set to 7.
Copy parameters from AEC-PM2 to MZ3
Copy the parameters from AEC-PM2 to MZ3 simply by pressing the "Copy" button on the
AEC-PM2. The "Data" LED on the AEC-PM2 will light for 5 seconds after the parameters
have been successfully copied. If the parameter copy failed, the LED will blink for 5
seconds.
Calibration
The CO2 sensor unit is maintenance free in normal environments thanks to the built-in self-correcting ASC (Automatic-
Self-Calibration) algorithm. This algorithm constantly remembers the sensor's lowest reading over a 7-day interval and
slowly corrects any long-term deviation detected compared to the expected fresh air value of 400 ppm CO2.
However, rough handling and transportation may result in a decrease in sensor measurement accuracy. Over time, the
ASC function will return the readings to the correct values. However, the preset correction rate is limited to approximately
30 ppm/week.
In the event that you cannot wait for the ASC algorithm to correct a calibration error, manual calibration can be activated
using the following procedure.
Calibration to 400 ppm (with fresh air)
1.
Connect the OPA-S to the MZ3 and expose the MZ3 to fresh outside air for at least 5 minutes. It is important that
the CO2 sensor is exposed to fresh air only. An open window near the sensor with a higher CO2 concentration
could prevent a stable signal. Observe the CO2 value on the OPA-S.
2.
Once the CO2 value has stabilized, log on to the OPA-S and set the parameter IP02 = ON and exit configuration
mode to start calibration.
3.
As soon as the calibration has been performed, the parameter IP02 will change to OFF and the OPA-S will display
a CO2 value in the order of 400 ppm.
4.
If the calibration was not successful, wait at least 1 minute before repeating the procedure. Make sure that the
sensor environment is calm!
Doc: 70-00-0982A V2.5, 20230123
Subject to alternation
© Vector Controls GmbH, Switzerland
www.vectorcontrols.com
MZ3-C-V11
Page 7-8
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