AFA4000/E VAV Airflow Controller / p.85
Figure 50: Tilt switch wiring schematic
6.6 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.
6.6.1 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 6.9 and Figure 51.
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.
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