Timer Adjustment; Servicing And Maintenance - Vent-Axia Lo-Carbon Quadra Series Installation And Wiring Instructions

2. SELECTING THE BOOST SPEED (15, 30 or 60 l/s)
This will determine the speed at which the fan will run when activated by either the Pullcord, PIR,
LS, or Relative Humidity Sensor (note: the %RH boost speed is 50% of the set boost flow rate –
see Relative Humidity Adjustment section below).
Slide one of the three switches marked as 'Boost Speed' in fig.7 to the right (on position)
i.
to select that flow rate for boost speed.

3. TIMER ADJUSTMENT

The overrun time period is the length of time that the fan will continue to run at boost for after the
LS connection is switched off or the PIR (Quadra TM only) stops sensing movement. It is factory
set to approximately 15 minutes. The overrun time period may be adjusted from approximately 1-
30 mins by altering the adjuster on the control PCB. (figs.4 & 7).
i. To REDUCE the operating time, turn the adjuster ANTI-CLOCKWISE.
ii. To INCREASE the operating time, turn the adjuster CLOCKWISE.
4. RELATIVE HUMIDITY ADJUSTMENT (HTP model only)
The fan's Relative Humidity (RH) Set-Point is factory set to switch the fan on at about 72%RH.
The fan will increase the flow rate proportionally with %RH to 50% of the set boost speed. If
constant trickle is selected, the fan will increase the flow rate from the set trickle rate to 50% of the
boost rate. To Boost the fan to 100% of the boost rate use the integral pullcord or remote switch
via the LS connection.
i. To LOWER the Set-Point, turn the Humidity Adjuster (figs.4 & 7) ANTI-CLOCKWISE. This
makes the fan more sensitive to RH%, i.e. the fan will come on at a lower RH%.
ii. To RAISE the Set-Point, turn the Humidity Adjuster (figs.4 & 7) CLOCKWISE. This makes
the fan less sensitive to RH%, i.e. the fan will come on at a higher RH%.
C. WIRING.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING INSTALLATION OR
MAINTENANCE.
Use 0.75mm
1. Select and follow the appropriate wiring diagram (figs. 9 & 10).
2. Additional controls, such as room mounted humidistats, pullcords, PIR sensors and
normal/boost switches, can be connected to the LS connection instead of the room lighting
circuit in fig 10 in order to make the fan boost. These accessories must switch a 240V 50Hz
live connection on when boost is wanted.
3. Use the Cable Clamp provided.
4. Check all connections have been made correctly and ensure all terminal connections are
securely fastened.
D. SERVICING AND MAINTENANCE.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING SERVICING OR
MAINTENANCE.
1. At intervals appropriate to the installation, the fan should be inspected and cleaned to ensure
there is no build up of dirt or other deposits.
2. If you have a Filter (fig.3), remove it by using a small, flat bladed screwdriver to lift the bottom
edge over the retaining edge (fig.2) and then slide the filter out.
2
cable