Vent-Axia Centrif Duo Installation And Wiring Instructions page 9

Fig 7. Setup
WARNING: THE FAN AND
ANCILLARY CONTROL
EQUIPMENT MUST BE ISOLATED
FROM THE POWER SUPPLY
DURING INSTALLATION OR
MAINTENANCE.
TO ACCESS THE SPEED
CONTROLS/PCB, REMOVE THE
TWO SCREWS HOLDING THE PCB
COVER IN PLACE.
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