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UAB AMALVA we reserve the right to make changes without prior notice.
2.6. “OVR” function
“OVR” (Override) function is intended for remote unit control by an additional external device. After the activation
of this function the current mode of operation will be ignored and the unit will operate at a set intensity.
Applications of the “OVR” function:
• Maintenance of CO
2
quantity in room
– by adding an additional CO
2
sensor (with relay), the main user-set
ventilation rate at higher CO
2
will be switched to the maximum intensity until the room is ventilated, and then
again will return to the user-defined intensity.
• Maintaining relative humidity in the room
– after contacting the external relative humidity sensor (with relay),
automatically switching to maximum or different set ventilation intensity the humidity level desired by the user
will be maintained.
• Ventilation on demand
– when the motion sensor is connected to the control contacts, ventilation will be
adjusted according to demand, i.e. if people are indoors, ventilation will be carried out according to the set
“OVR“ intensity and if there‘s nobody in the room - the unit will operate according to the main user intensity, for
example, the minimum.
• Ventilation with additional air extraction
– connection of additional extracting device, for example, a kitchen
hood or other extraction device without a separate fan, is intended, thus the air extraction is carried out by the
unit itself. After the activation of the function the supply and exhaust air fans start operating at maximum intensity.
• Negative pressure compensation
– intended for systems where air extraction can be carried out in a sepa
-
rate air extraction fan. Thus, for the compensation of negative pressure in room, the “OVR” function can be
activated by separate control contacts. After the activation of the function, only supply fan starts operating at
maximum intensity and the exhaust air fan goes off.
Note:
To make this function work, namely to stop the exhaust air fan in the “OVR” mode, the jumper No 4 on the
automation box should be ON (2.8. Picture).
2.7. Activation of the “OVR” Function
The „OVR“ function can be activated in two ways:
1. With the external control device.
Connection is described in chapter 1.4. After connecting (short-circuiting)
the FC contacts (see the wiring diagram), the unit will operate in the selected „OVR“ mode (see chapter 2.6.),
and after their disconnection the unit will return to the previous operating mode.
2. With the control panel.
In this case there is no need for additional connections to external control devices,
the function is activated by the control panel, and the unit will operate in the selected „OVR“ mode until the unit
internal timer is active.
„OVR“ mode activation procedure:
• Enable the maximum level with the ventilation intensity selection switch (4) (Picture 2.1.) (before enabling, the
unit must operate at a minimum or at normal intensity).
• After enabling the maximum level, switch back and forth the “Summer / Winter“ mode setting switch (3) in 5
seconds as many times as the „OVR“ function timer has to be active:
1 time
2 times
3 times
Timer 30 min.
Timer 60 min.
Timer 90 min.
• After the timer activation, the required level of ventilation has to be set, in which the unit will operate after the timer
is shut down, i.e. when the set „OVR“ mode time will expire.
Example.
„OVR“ mode activation for 1 hour:
2 times
1
2
3
Note:
In order to disable the „OVR“ mode before the timer period expires, it is necessary to carry out the above
steps (1) and (3), and to omit the step (2).
Summary of Contents for Domekt RECU
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