Vent-Axia MultiVent FAN7453, Manual

Installation Instructions

Specifications are subject to change without notice. 

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MultiVent Continuous Extract Ventilation

Using instructions from the section “UNIT ADJUSTMENT” make the following changes:

LS1 change from Low to BOOST
D2 change from Purge to BOOST 

With this completed the MultiVent once switched ON will operate in NORMAL speed (35%) when the bathroom FAN switch is turned on the 
MultiVent will operate at BOOST (70%) speed clearing away steam and humidity if the kitchen FAN switch is turned on the MultiVent will operate 
at BOOST (70%) if both bathroom and kitchen FAN switches are turned on together the MultiVent will operate at PURGE (100%) speed helping 
to clear away steam and cooking odours. The toilet FAN switch will also turn the MultiVent on to BOOST (70%). Please note that only having the 
2 larger rooms (bathroom and kitchen) switched on will activate PURGE (100%) speed.

FAULT CODES

FOR COMPLIANCE WITH G4/AS1 CLAUSE 1.5

If the MultiVent unit detects a fault it will display an error message on the HMI display.

These applications are to be installed and maintained to the requirements of AS/NZS 3666.1 and AS/NZS 3666.2.

Fault Code

Description

F01

Control fault – Unit failed startup check

F02

Motor Fault – No RPM

F03

Humidity/Temp sensor Fault – No value

F04

Temp or Humidity sensor connected via RF/RS485 is offline/Lost

For the toilet the MultiVent will use its Extra Low Voltage connections for control. Using a short piece of wire connect a 0.5mm (or similar sized wire) 
from the GND terminal at the RS485 connection to the COM terminal adjacent to DIN 2 (digital input 2) + connector. Using a twin red TPS cable 
connect one RED core to the + connector at DIN 2 and connect the other RED core to the 5V terminal at the RS485 connection. Run the other end 
of the cable to the toilet FAN switch and connect the 2 red cores to the C (common) and the normally open (usually labelled 1) connections at this 
switch. See diagram below.

C

TOILET

1

RED

RED