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UAB AMALVA we reserve the right to make changes without prior notice
EN
C4-16-01-v1
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
separate 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 operat
-
ing 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
(2.7. Picture).
2.7. Configuration of automation functions
Switches (2.7. Picture) on the automatic box can be used for the selection of heat exchanger type, heater and
fan, and the OVR function mode. Settings take effect only after rebooting the power supply.
Switch No.
ON
OFF
1
Rotary heat exchanger
Plate heat exchanger
2
Water heater
Electric heater
3
Is not used
Is not used
4
OVR mode when the exhaust air fan is off
Usual OVR mode
Automation configuration switches
2.7 Picture
Summary of Contents for C4
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