Page 6
Airflow adjustment for Left-Hand Drainage
1. For left hand drainage as shown on Page 5, ensure that the jumper switch JP4 (see diagram above) is in
Position B.
Normal (trickle) speed (l/h drainage)
2. Before making any adjustments, switch on the unit at trickle speed.
WARNINg : 230 volt, live mains are
present on the circuit board.
Move the speed adjust jumper switch JP5, to position A, as shown in the
diagram. A green light will appear on the circuit board.--
3. With the boost switch OFF (bathroom light switch off), measure the airflow rate at the extract valve and
compare this to the design value. If there is a difference, adjust the potentiometer MIN-MOT1, on the con-
trol board and re-check the airflow rate. If the value is slightly higher than that required, final adjustment
can be made at the air valve.
4. Set the position of the potentiometer MIN-MOT2 to the same as MIN-MOT1.
5. Measure the airflow at the supply valve. This should be the same or slightly lower than the extract rate
(
unless a different supply value has been specified). If higher, reduce the airflow by adjusting MIN-MOT2.
Final, minor adjustments can be made at the air valve.
Boost speed (l/h drainage)
6. Switch on the boost (light switch ON).
7. Measure the airflow rate at the extract valve and compare this to the design value. If there is a difference,
adjust the potentiometer MAX-MOT1.
8. Re-check the airflow rate and make further adjustments at MAX-MOT1 until correct.
Do not re-adjust the
air valve.
9. Set the position of the potentiometer MAX-MOT2 to the same as MAX-MOT1.
10. Measure the airflow at the supply valve. This should be the same or slightly lower than the extract rate.
*
If higher, reduce the airflow by adjusting MAX-MOT2 until correct.
Do not re-adjust the air valve
.
*
unless a different supply value has been specified.
11. Return the speed adjust jumper switch JP5, to position B (green light goes out)
Timer Overrun Adjustment
After the boost switch has been turned off, the fan will continue to run at boost speed for up to 20 minutes.
This overrun time is adjustable using the potentiometer marked TIMER. The time can be varied between 0 and
20
minutes. After the set time, the fan returns to normal speed.
Delay-on Boost
When the boost switch is operated, the boost speed activation can be delayed by 2 minutes, if required.
Using the jumper switch JP6, move the jumper position to either:-
A
- 2 minutes, or
B
- 0.5 seconds
Finally, replace the control panel cover securely.
Controller Adjustment diagram
