mCq pCO - Standard + Heat Pump - McQuay
mCq pCO - Standard + Heat Pump - McQuay mCq pCO - Standard + Heat Pump - McQuay
Conditioning: pCO Standard chiller + heat pump User Guide ver. 2.9 02/11/99TWO-COMPRESSOR UNIT WITHOUT CAPACITY-CONTROLLED ROUTINENote: the example above refers to cooling applications (Summer mode).For heating applications (Winter mode), the steps will be positioned specularly withrespect to the set-point.TWO-COMPRESSOR UNIT WITH 1 CAPACITY-CONTROLLED ROUTINE PERCOMPRESSORNote: the example above refers to cooling applications (Summer mode).For heating applications (Winter mode), the steps will be positioned specularly withrespect to the set-point.The best working condition is achieved when the unit manages to reach and keep the set-pointvalue without operating any of the connected devices.If the unit works as a heat pump, the compressors' position on the diagrams will be in thenegative field of the proportional zone.Important: the regulation of the water temperature will depend either on the water temperatureprobe at evaporator inlet or evaporator outlet, as required by the User.Pag.26/61
Conditioning: pCO Standard chiller + heat pump User Guide ver. 2.9 02/11/99It is also possible to set a dead (neutral) zone around the set-point permitting the compressors -as well as the fans when working in freecooling mode - to remain off.In this way the steps of both fans and compressors will be moved on the right with respect tothe selected dead zone. The example below shows the position of the steps after havingselected a neutral zone around the set-point.dead zoneC = compressorP = parzializationC1P1C2P2setpointdifferentialwatertemperatureNote: the range of the dead zone must be inferior to the selected differential otherwisethe connected devices will not activate.Compressors start-up (with and without capacitycontrolled)Any time the compressor is instructed to start, the relative contactor will energize and -depending on the value of the water temperature at evaporator inlet or outlet - the controllerwill:- instruct the compressor to start;- energize the LIQUID SOLENOID valve.- the compressor will start.Compressors shiftSelecting the compressors shift ensures longer life to the compressors.This procedure, in fact, makes them work in a very balanced way and compensates the numberof their on/off routines as well as their working hours.The shift is based on a F.I.F.O. logic: the first compressor that starts will be the first to bestopped.At the very beginning this logic might cause an unbalanced compressors management but thesystem will gradually settle.Upon a call for compressor start-up, the logic will be as follows:- the compressor that has been Off for the longest time-interval will be the first to start;- the first compressor that starts will be the first to be stopped;- any compressor will start again only after all the other compressors have started once.Capacity-controlled routines do not undergo shifts.Pag.27/61
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Conditioning: <strong>pCO</strong> <strong>Standard</strong> chiller + heat pump User Guide ver. 2.9 02/11/99TWO-COMPRESSOR UNIT WITHOUT CAPACITY-CONTROLLED ROUTINENote: the example above refers to cooling applications (Summer mode).For heating applications (Winter mode), the steps will be positioned specularly withrespect to the set-point.TWO-COMPRESSOR UNIT WITH 1 CAPACITY-CONTROLLED ROUTINE PERCOMPRESSORNote: the example above refers to cooling applications (Summer mode).For heating applications (Winter mode), the steps will be positioned specularly withrespect to the set-point.The best working condition is achieved when the unit manages to reach and keep the set-pointvalue without operating any of the connected devices.If the unit works as a heat pump, the compressors' position on the diagrams will be in thenegative field of the proportional zone.Important: the regulation of the water temperature will depend either on the water temperatureprobe at evaporator inlet or evaporator outlet, as required by the User.Pag.26/61