TEMP/TIME Based controls is the principle of operation.
UN2000 is used in this method. The instrument is designed for single or double stage compressors. The antifridge and capacity control are important temperature points. Compressor is switched ON & OFF considering these points. This leads to optimum use of compressor intern saving in electricity bill. Also DELAYTIME is introduced to avoid frequent ON/OFF. Once the compressor gets off & if temperature increases above set point it can get ON only after the DELAY TIME. The delay time is also programmable.
Inputs : I. 4-20 mA form Volumetric Flow meters---(A), II. The temperature of inlet and outlet of compressor is measured Two R.T.D.'s(T1-T2)---(B)
Range : -40 to 0 °C
Supply : 90-260 VAC , 50 Hz
Logic : One constant is to be derived depending on density and viscosity of BRINE---(C )
A*B*C Is the TR of Compressor
TR INDICATOR HELPS IN MONITORING EFFICIENCY OF COMRESSORS AND GUIDES TO TAKE CORRECTIVE ME