Upgraded control system for Axminster air filter units.
Button options (actions take effect when button is released):
- quick (< 3 seconds) press start/demand button: start fan if stopped, or reset timer to 20 minutes if already running
- long (>= 3 seconds) press start/demand button: stop fan
- quick press speed button: cycle fan speed if running
Sometimes the display can become unresponsive due to electrical noise from the contactors. A power cycle will fix this.
From fan motor:
- black = N
- white = SL high speed
- yellow = SL medium speed
- blue = SL low speed