7
Humidity and Time Set-Point Adjustment.
The fan’s Humidity Set-Point is factory set to switch the fan on at approximately 72%RH. The sensitivity may be
adjusted from 65%RH - 90%RH, by altering the adjuster on the Fan PCB.
The overrun Time period is factory set to approximately 15 minutes. The overrun time period may be adjusted from
5-30 minutes, by altering the adjuster on the Fan PCB.
Before adjusting the Set-Point, switch off the Mains Supply.
1. Remove the Indoor Grille [A]. Loosen the screw (top middle) of the Grille, to release front grille gently lever the
Grille downwards away from the Inner Cover [B].
2. Remove Inner Cover [B]. Loosen the screw (bottom middle) and release the inner grille gently from the Base
Housing [D].
3. To LOWER the Set-Point/ operating time, turn the indicated adjuster ANTI-CLOCKWISE. This makes the fan
more sensitive to RH%, i.e. the fan will come on at a lower RH% or will reduce the overrun time.
4. To RAISE the Set-Point/ operating time, turn the adjuster CLOCKWISE. This makes the fan less sensitive to
RH%, i.e. the fan will come on at a higher RH% or will increase the overrun time.
5. Replace the Inner Cover and Indoor Grille.
6. Reconnect the mains supply.
Shutter Operation
The shutter mechanism in all VA140/ 150 range fans will open approximately 40 seconds after the fan is turned On.
The shutter will close about a minute after the fan is switched Off.
C.
SERVICING AND MAINTENANCE.
WARNING:
THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE ISOLATED
FROM THE POWER SUPPLY DURING 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. Remove the Indoor Grille (See Section A : 2 for instructions) and wash in warm soapy water.
3. Wipe the shutter blades with a damp cloth until clean.
4. Replace the Grille.