Retrotec 3300 series variable-frequency fans require 100-280 VAC 50/60 Hz power in order to operate reliably. Voltage drops due to line losses and fluctuations in AC power can be significant. The fans will not work at line voltages of less than 95 VAC.
If the system will:
· Not control smoothly
· Slow suddenly
· Stop completely
· Produce less than 6,500CFM @100% speed
· Multi-fan systems will oscillate, with fans running at varying speeds
The problem is likely that insufficient line voltage is arriving at the variable-frequency power supply.
To resolve the issue
· Use a 240VAC Stove or Dryer outlet
· Use 208VAC
· Reduce extension cord length on 120V circuits and/or use an industrial quality 12 gauge extension wire.