Uniflair UST500 Instruction Manual
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Contents
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UST500 CONTROL BOARD46 06MC0074@00B010014/04/2010Operating modesAlways on digital modeThe internal circuit water pump is always active, unless• one or more alarms are blocking the internal circuit water pump;• the device is switched OFF locally or remote, and antifreeze with water pump is not active if enabled. (*)• the device is switched to stand-by locally or remotely and antifreeze with water pump is not active if enabled. (**)(*) The pump switches off immediately.(**) The pump switches off after the set safety delay (e.g. after the delay following compressor shut-down)Digital operation on requestThe internal circuit water pump is switched on when requested by the temperature controller.In addition*• The compressor is switched on with a set delay (Pa PI02) after the internal circuit water pump switches on.• The internal circuit water pump is switched off with a delay (Pa PI03) after the temperature controller enters the OFF state and frommachine standby.• During defrost, when the compressor is OFF, the circuit water pump stays on.• The pump is on if internal circuit antifreeze heaters are active (if enabled in parameter PI22 – see table. See also the heaters chapter,parameters HI00, HI01).Table PI22Parameter Description Value0 1PI22Enable internal circuit water pump on whenantifreeze heaters active Internal circuit waterpump disabledInternal circuitwater pumpenabled• The pump is on if the heaters are on in integrated use.• The pump is on if the boiler is onThe internal circuit water pump is off if• Temperature control is not requested (except for * - see above)• One or more active alarms are blocking the internal circuit water pump;• the device is switched OFF locally or remotely (*).(*) The pump switches off immediately.Diagram ATERM: temperature controller COMPR: compressorWP: internal circuit water pump Time: time in secondsPI02: Delay internal circuit pump on -compressor onPI03: Delay compressor off - internal circuitpump offThe internal circuit water pump is switched on when requested by the temperature controller.In addition:• the compressor is switched on with a delay (PI02, see table 3 par. PI02-PI03) after the internal circuit water pump is switched on• the internal circuit water pump is switched off with a delay (PI03, see table 3 par. PI02-PI03)) after the compressor is switched OFF and after machineenters STD-BY state• when the compressor is OFF during defrost, the internal circuit water pump stays on• the internal circuit water pump is on during internal circuit antifreeze is this function is enabled in the relative parameterTable 3 (par. PI02-PI03)Parameter DescriptionPI02 Delay internal circuit water pump on and compressor onPI03 Delay compressor off - internal circuit water pump off.Pa PI03Pa PI02ONOFFTimeTERMONOFFTimeCOMPRONOFFTimeWP |
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