880-ECM Series

Head Pressure Control

The electronic head pressure control modulates condenser fan motor speed by varying the air volume through the condenser. The control monitors the head pressure by sensing the sub-cooled liquid line temperature.
Applications
Typically utilized on new, energy efficient ECM condenser fan motors in air conditioning and refrigeration systems. 880-ECM(SS) Model for PWM Control of single motor condenser applications, 880-ECM(VDC) Model for 0-10 VDC control of single motor condenser applications, and 880-ECM(DS) Model for multi motor refrigeration applications.
Applicable Motors
  • ECM (brushless dc) Motors
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Features
  • Improves system performance while saving energy
  • Non-invasive sensor requires no system penetration
  • Eliminates compressor slugging
  • Sensing is independent of all refrigerant types
Typical Installations
  • Commercial A/C
  • Computer rooms
  • Hospitals
  • Grocery and convenience stores
  • Frozen food storage
  • Humidity or temperature sensitive environments
  • Cooling tower fans, glycol coolers
  • Liquid heat exchangers

Why Measure Head Pressure using Temperature instead of Pressure?

Many people assume that the best way to control the head pressure from a compressor is to directly sense the line pressure using a sensor inserted into the liquid line.
Data Sheets for Models Available
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“Dallas