All motors are tested at Retrotec facilities for 1.5 hours under full current and stress. The motors which shut off due to excess heat are rejected, and sent back to the beginning of the production line. Some users, however, may still encounter problems in the field. Below are some points that may be followed to remedy a specific problem.
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The 3300 series fan's power supply will stop working if either of the following conditions occurs:
1. The internal 25 Amp circuit breaker is triggered
2. The internal relay comes loose
If either situation occurs,
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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:
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