mCq pCO - Standard + Heat Pump - McQuay

Conditioning: pCO Standard chiller + heat pump User Guide ver. 2.9 02/11/99• number of compressors to be controlled;• compressors capacity-controlled routines;• water temperature probe at evaporator inlet;• water temperature probe at evaporator outlet;• temperature probe circuit no.1;• temperature probe circuit no.2;• pressure probe circuit no.1;• pressure probe circuit no. 2;• min. and max. values for pressure probes (when al least one probe is connected).In the 2nd masks loop you can set all parameters concerning the compressors:• min. time compressors' off;• min. time compressors' on;• min. time-interval between two consecutive On routines of the same compressor;• min. time-interval between two On routines of different compressors;• time-delay between two capacity-controlled routines or time-delay between a compressor'sstart-up and its capacity-controlled routine;• compressors shift;• pump-down procedure;• max time pumpdown procedure (only if the procedure has been previosuly enabled);• compressor off during defrosting;• compressor off only when the defrosting cycle begins or at start/end defrosting (thisparameter will be displayed only if the defrosting procedure has been previously enabled);• time-interval relative to the compressor's off routine during defrosting (this parameter will bedisplayed only if the procedure has been previoulsy enabled);• defrosting mode: depending on one or two probes (when using just one external airtemperature probe the system also needs an end-defrosting pressurestat).In the 3rd masks loop you can select the following parameters:• type of regulation: Proportional or Proportional + Integral;• integration time (when selecting a P+I regulation logic);• time-delay before stopping the electropump after the unit has been turned off (unless thereis an alarm condition);• Differential capacity step when the pressure exceeds the high pressure threshold;• time-delay before activating the low pressure pressurestat alarm when the compressorstarts;• time-delay before activating the oil differential pressurestat alarm when the compressorstarts;• Max time in which manual reset low pressure alarm can occur;• Number of automatic reset low pressure alarms before manual alarm occurs;• time-delay before the activation of the flowmeter alarm when the unit is working understeady conditions;• time-delay before the activation of the flowmeter alarm when the electropump starts;• pressure values determining the Start/Stop routines of the fans;• inverter set-point and differential;• selection of Low Noise mode.The 4th masks loop allows you to perform the following operations:• set factory-set values (this should be done when you start the unit the very first time and anytime you change the unit eprom);• set a new manufacturer keyword.Pag.53/61