TEL AFA4000/2, Installation And Operating Manual

Page: 78 / 177

AFA4000/2 Airflow Monitor / p.78
Figure 50: Tilt switch wiring schematic
6.7 Sash Low switch
Two types of Sash Low switch can be used:
•
Micro-Switch
• Proximity Switch
Switches signal the sash as being open when the switch is open or closed, depending on
the installation requirements.
6.7.1 Installing the Sash Low micro-switch
The Sash Low Micro-Switch is a change-over type switch. When the sash is closed the
switch makes or breaks the circuit depending on which terminals are used on the switch
for each type of activation. Typically, the switch would be fitted so that the lever engages
(pushes in) when the sash is open.
Connect the Sash Low Micro-Switch to the Auto Sash Control Unit (Figure 51 See the
wiring schematic in section 6.10 and Figure 31.
If the switch is installed so that the lever pushes in when the sash is closed , connect the
wiring to the Auto Sash Control Unit to terminals C and NO on the switch.
If the switch is installed so that the lever pushes in when the sash is open , connect the
wiring to the Auto Sash Control Unit to terminals C and NC on the switch.