Power Circuit

1 Motor Starting Equipment Star Delta / Solid State StarterProtection Fuses / MCBsOver Load Relay for compressorsOver Load Relay for FansPhase volt Monitor

2 SafetiesHP SwitchLP SwitchOil Pressure SwitchAnti FreezeLow Chilled water FlowLoss of Refrigerant charge

3 Capacity Control ( Leaving water temperature to be held withing +/- 0.1 deg C)

Sensor Controller First Stage ofTemp Sensor Controller Solenoid Valves

Cut of Cylinders

4 Display Type LED / LCD / Super VGA

5 Display Parameters Chw Temp entChw Temp LeavingCondensing tempEvaporator TempSuction Super HeatDischarge Super Heat% Load

6 Compressor Controller Lead / Lag control or Run time equalisationPump down at the beginging and end of every cycleLimiting of chilled water temperature pull down rate at start up to 0.56 deg C per minute

7 Keeping a Track of Records

Second Stage ofCut of Compressors

Controls

Capacity Control

Sensor Controller First Stage of Second Stage ofAction Action

Recips Temp Sensor Controller Solenoid Valves Cut of CompressorsCut of Cylinders

Screw Temp Sensor Controller Slide valve unloads Cut of Compressorsthe screw

Centrifugal Temp Sensor Controller Hydraulic assemblycloses the Guide vanes

Absorption Temp Sensor Controller Closes the Steamcontrol valve

Split unit Temp Sensor Relay Switches of compressor

Window uniTemp Sensor Relay Switches of compressor

Fridge Temp Sensor Relay Switches of compressor