Introduction
1.0INTRODUCTION
1.1Description
The Liebert VFD Control Condenser, Model TCDV, is an air cooled direct-drive refrigeration con- denser designed to reject the heat from a precision air conditioning unit to the outdoor air. The con- denser uses a Variable Frequency Drive (VFD) to control fan speed, which provides positive refrigerant head pressure control for outdoor ambients as low as -20°F (-28.9°C).
Figure 1 Liebert Model TCDV Condenser—2-fan
1.2Application
The VFD Control Condenser is applied to precision air conditioning units with dual refrigeration cir- cuits, including units with digital scroll compressors.
1.3Features and Benefits
•Variable Frequency Drive (VFD)—Programmed at the factory to integrate fluctuating head pres- sure signals created by compressor unloading, including digital scroll compressors, and varying condenser capacity created by lower ambient temperatures.
•The VFD adjusts fan speed to provide stable fan speeds and condensing temperatures.
•Provides protection for motor overload and incoming power supply phase loss, undervoltage and overvoltage.
•Built-in EMC filter—Electromagnetic emission levels comply with EN61800-3 (Second Envi- ronment - Light Industrial Applications).
•Inverter duty motor with permanently lubricated ceramic ball bearings for reliability
•Transducers on each circuit sense refrigerant pressures, providing input to the VFD
•Standard TVSS—Transient Voltage Surge Suppression increases condenser reliability by build- ing in a layer of electrical protection against electrical failure caused by transient voltage surges from unconditioned power sources and atmospheric discharges.
•Standard Locking disconnect
•Contacts for monitoring VFD and TVSS alarm conditions
•Available in 2-, 3- or 4-fan, dual-circuit condenser models
