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S21
6
Exhaust damper actuator control and/or
extract fan frequency converter release
Relay
3A,
=30 V/~250 V
VALVE2
Discrete control of the cooler
Relay
3A,
=30 V/~250 V
KKB
The operation of this output depends on the cooler type selected via the
Engineering Menu:
Discrete.
The output will directly control the cooler.
Analogue.
The output will be used for cooler release. You can configure the
minimum activation period and the minimum idle time before a subsequent
activation.
Discrete control of the bypass or
analogue control of the rotary heat
exchanger
Two relay
outputs
3A,
=30 V/~250 V
3A,
=30 V/~250 V
BPS
The operation of this output depends on the unit configuration.
Discrete bypass:
Opening the bypass closes the BPS relay (C - NO) and opens the BPS relay
(C - NC).
Closing the bypass opens the BPS relay (C - NO) and closes the BPS relay
(C - NC).
Rotary heat exchanger:
Discrete.
The output will directly control the actuator.
Analogue.
The output will be used for actuator release.
The BPS relay (C - NO) is enabled.
Communication interfaces
RS-485
The terminal (RS-485) is energised with 24 DC V to power up to 16 external devices. The maximum current is 500 mA. Any current in excess
of 500 mA triggers the overload protection to automatically restore power once the load reverts to normal.
Wi-Fi
The unit can be fitted with a 50 ohm remote antenna.
