Pressure Guard - SystemAir SAVE VTC 200-1 Service & Accessories Installation Manual

42 | Accessories
Note:
24 VAC dampers can be powered and
controlled only by using a relay mounting kit
with a transformer (article number: 153548).
This installation procedure describes how to connect
dampers powered by 230 V~ with a relay mounting kit
without transformer (article number: 153549).
Installation and connection
1. Install dampers (U/V).
2. Connect control signal wires (24V, DO) coming out from
the relay box (RL) to any free digital output on the con-
nection board (CB).
3. Connect power supply wires (N) from dampers to the
terminal block. Connect control signal wires (Y, line)
from dampers to relay socket terminals (11, 21). See
illustration.
When damper with a non-spring return actuator is
used, an addition power line (L) has to be connected to
the terminal block since such damper requires constant
power supply.
4. Connect power supply wires (L, N) coming out from the
relay box to 230 V~ power source.
Configuration
1. Go to Service menu
2. Enter password (default 1111)
3. Configure control signal to the relay. Go to Output menu. Select DIGITAL tab. Select the digital output to which the
relay is connected. Example if it is connected to DO3 on the connection board, then select DIGITAL OUTPUT 3 and
select signal type as Outdoor-/Exhaust Air Damper from the output type list.
6.5.2

Pressure Guard

A differential pressure switch is used to detect air pressure difference in a duct. The contact in the switch changes (on/
off) when air pressure exceeds the setpoint value.
One of the possibilities is to use this device with a cooker hood which has an internal fan. Turned on cooker hood causes
air pressure to increase in the exhaust air duct. After exceeding a set air pressure value in the pressure switch, wires
from the ventilation unit get connected by contact and signal is sent to the ventilation unit to activate the Pressure
Guard function.
Fig. 12 Damper connection
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