Vent-Axia Sentinel Multivent SMV Instructions De Montage Et De Câblage page 6

5.6. Controllers or switches that switch a volt-free relay can be connected to the volt-free terminals on the
motherboard. When the circuit between the two terminals is closed, (when a connected switch is in the 'On' or
'Closed' position, for example), the fan will switch to Boost speed. There are no delay on or overrun timers with the
volt-free connection as the controller should determine when the fan is running at Boost or Normal speeds. Use the
LS connection described above if you want a timer.
5.7. Multiple controllers or switches can be connected to the volt-free terminals when connected in parallel and the
cable lengths are not long.
5.8. Connecting a switch / relay between the Com and Hi terminals will have the same effect as the connecting to
the volt-free connections.
5.9. The Lo, Hi and Com terminals can be used to connect a three position switch. Connect Com to the common
terminal of the switch, Lo to Lo, Low or position 1 and Hi to Hi, High, Boost or position 3. No connection to Normal or
position 2 is required. If there is no current to the Lo or Hi terminals on the motherboard, the fan will default to
Normal speed.
5.10. An optional wall mounted CO sensor (433257) can be connected to the 24V, 0V and 10V terminals. The CO
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sensor will tell the Sentinel Multivent what the CO level is in ppm (parts per million) and the unit will adjust the fan
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speed accordingly. When the CO level is below the lower threshold, (adjustable in the software), the fan will run at
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Normal speed. When the CO level is above the upper threshold, (also adjustable in the software), the fan will run at
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Boost speed. If the CO level is between the lower and upper thresholds the fan will run at a speed in between
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Normal and Boost proportional to the difference between the CO level and the thresholds.
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5.11 An optional internal relative humidity sensor PCB (437598) can be purchased and connected. First remove the
small label covering the square hole on the scroll. Plug the connector on the end of the ribbon cable into the
connector on the motherboard marked RH. Screw the PCB on to the scroll in the location indicated above with the
small chip on the PCB pointing in to the square hole. The Sentinel Multivent uses technology similar to that in Vent-
Axia's Ambient Response product, to adjust the fan speed proportionally depending on the temperature and relative
humidity levels in the extracted air whilst avoiding nuisance tripping at night time when temperatures drop and
relative humidity naturally rises. The Sentinel Multivent does not just look for relative humidity levels above a set
point, which can be unreliable in products that extract from multiple rooms, but it also looks for rapid increase in
relative humidity typically generated by such activities as showering or cooking.
5.12. The Sentinel Multivent can also be controlled by an optional battery powered, wireless boost switch (437827)
when the optional wireless receiver PCB (437599), (available in wireless boost and receiver kit 439352), is
connected to the motherboard. Screw the wireless receiver PCB to the scroll in the position indicated above and
plug it in to the connector on the motherboard marked CO . The system address is set by the 6-way DIP switch on
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the PCBs. The system address needs to match on the receiver PCB and all transmitter PCBs for any one system.
For multiple systems in close proximity to each other, the system addresses need to be different in order to identify
which transmitters are controlling which fans. The transmitter PCBs also have a 2-way DIP switch to set the
transmitter address. Up to four transmitters can be used to control any one Sentinel Multivent. The transmitter
address needs to be different for each transmitter in a system.
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