mCq pCO - Standard + Heat Pump - McQuay

Conditioning: pCO Standard chiller + heat pump User Guide ver. 2.9 02/11/99ALARMS loopAL_1Compr.Therm.OverloadCircuit 1This mask refers to digital input no. 11 relative to compressor breakers of the 1st circuit.In this case the off-normal condition forces compressor no.1 and relative fan to stop.AL_2Compr.Therm.OverloadCircuit 2This mask refers to digital input no. 12 relative to compressor breakers of the 2nd circuit.In this case the off-normal condition forces compressor no.2 and relative fan to stop.AL_3Low Pressure SwitchCircuit 1Manual ResetThe low pressure condition in the 1st circuit forces compressor no. 1 to stop.AL_3bLow Pressure SwitchCircuit 1Automatic ResetThe low pressure condition in the 1st circuit forces compressor no. 1 to stop; when the pressurestat switchson the circuit starts up automatically. If pressurestat’s contact is open , to start up the circuit you must openand close digital input contact no. 1.AL_4Low Pressure SwitchCircuit 2Manual ResetThe low pressure condition in the 2nd circuit forces compressor no. 2 to stop.AL_3bLow Pressure SwitchCircuit 2Automatic ResetThe low pressure condition in the 2nd circuit forces compressor no. 2 to stop; when the pressurestat switchson the circuit starts up automatically. If pressurestat’s contact is open , to start up the circuit you must openand close digital input contact no. 4.Pag.54/61