Installation Instructions
Specifications are subject to change without notice.
Page 7
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MultiVent Continuous Extract Ventilation
2. RS485 Wired inputs
The RS485 terminals are used to connect compatible sensors and switches. The connection allows sensors be daisy chained to simplify wiring.
The maximum length of cable run from. The unit is limited to 250m. Once accessories are wired to the unit, they must be paired to the unit to
function correctly.
LOW VOLTAGE CONNECTIONS
1. Important
: Use 4-core, low voltage, twisted pair, telecoms type cable for accessories. Accessories are connected via the IO (Input Output) PCB;
see the Low Voltage Connections diagram in the Main fitting and wiring guide.
Pos/Label Description
Action
A
5V
5V Output,
Max 250mA
RS485 communication to wired
accessories. Data connection (B, C) if
available. The 5V and Ground connections
are available on all units.
B
A+ Data
C
B-
Data
D
GND Ground
E
COM
Digital input
common
Go to Boost speed (Min.1V, max. 6V).
The 5V output from the RS485 connection can be
used as a power supply
F
+
Digital input 2
G
COM
Digital input
common
Go to Low speed (Min.1V, max. 6V).
The 5V output from the RS485 connection can be
used as a power supply
H
+
Digital input 1
I
COM
Digital output
common
Unpowered Boost indicator Switch
(switching 6V 50mA max)
J
+
Digital
output
2
K
COM
Digital output
common
Unpowered LED fault indicator switch
(switching 6V 50mA max)
L
+
Digital
output
1
M
+
Analog input 2
0-10V analogue input
Two user settable voltage thresholds with two user
settable actions. The unit will run at normal when
supplied voltage is between the two thresholds.
N
GND
Ground
O
+
Analog input 1
P
GND
Ground
Low Voltage Switch’s – Boost & Low Speed
