Anti-Freezing Operation
The EC fans must be operated periodically in cold weather to reduce the possibility of lock up due to ice and snow
accumulation. During periods of fan inactivity and outdoor temperatures below 35°F (1.6°C), the EC fans will spin for at least
30 seconds every 15 minutes at 60% of the maximum fan speed.
Surge Protective Device
An optional Surge Protective Device (SPD) can be field wired to protect the condenser from power surges that threaten
sensitive equipment. The condenser’s electrical panel provides a terminal block to allow the SPD to be wired in parallel with
the high voltage power. An additional low voltage terminal block is provided on condensers to allow monitoring of the SPD
alarm circuit.
ASCO Series 420 surge protective device provides 50kA per mode of surge current protection. An illuminated green LED
indicates the SPD is on and operating properly. An illuminated red LED indicates that the device may require replacement.
When both LEDs are off, there is no power to the condenser, either from a power failure or because the condenser disconnect
is in the off position.
8 Proprietary and Confidential ©2024 Vertiv Group Corp. 2 Nomenclature and Components
Vertiv™ Liebert® MCV Installer/User Guide
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