4
TIMER ADJUSTMENT
BEFORE ADJUSTING THE TIMER, SWITCH OFF THE MAINS SUPPLY. TIMER SHOULD
ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION.
1. Remove the fan grille. The controller is factory set at 15 minutes approx. The overrun time period can be
adjusted from 5-25 minutes by altering the adjuster on the control PCB.
2. To REDUCE the operating time, use a small screwdriver to turn the adjuster Fig.4. ANTI-CLOCKWISE.
3. To INCREASE the operating time, use a small screwdriver to turn the adjuster Fig.4. CLOCKWISE.
4. Replace the fan grille.
C. HUMIDISTAT / SHUTTERED HUMIDISTAT TYPE
The fan contains an integral humidity controller. In automatic mode the controller switches the fan on at full speed
when the room Relative Humidity (RH) reaches the set-point. The fan will continue to run until the room RH falls
below the set-point. Fig 5. These fans may also include a built in timer function. The timer can be activated by
removing the jumper JP1, This will give the fan a fixed over run time of approx. 15 mins.
HUMIDITY SET-POINT ADJUSTMENT
BEFORE ADJUSTING THE CONTROLLER, SWITCH OFF THE MAINS SUPPLY. HUMIDISTAT
SHOULD ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION.
1. Remove the fan grille. The controller is factory set to switch on at about 70% RH. The humidity set point can be
adjusted from 65-95%RH by altering the adjuster on the control PCB.
2. To LOWER the set-point use a small screwdriver to turn the adjuster Fig.5. ANTI-CLOCKWISE. This makes
the controller MORE sensitive.
3. To RAISE the set-point use a small screwdriver to turn the adjuster Fig.5. CLOCKWISE. This makes the
controller LESS sensitive.
4. Replace the fan grille.
NOTE! DO NOT TOUCH HUMIDITY SENSOR.
Shutter Operation
With the shuttered fan types the shutters will open immediately when the fan is turned on. The shutter will close
immediately after the fan is switched off. The shutters are positioned at the rear of the product and cannot be seen
from the front.
This product should not be disposed of with household waste. Please recycle
where facilities exist. Check with your local authority for recycling advice.
PO BOX 1285 GB
449726B
1116
