SiUS34-801A_b Basic ControlVRVIII R-410A Heat Recovery 60Hz 195circulation rate to be supplied to indoor units.6.6 Heat Exchanger ControlWhile in heating or cool/heat simultaneous operation, ensure target condensing and evaporatingtemperature by changing over the air heat exchange of outdoor unit to the evaporator or thecondenser in response to loads.[Single system]Hold the currentstep on outdoorunit fan-1 step onoutdoor unit fan+1 step onoutdoor unit fanPI controlPI controlLapse of 20 sec.Lapse of 20 sec.Fan step 7Pc>446.6psiPc>461.1psiFan step 8Pc>475.6psiFan step 9PI controlPI controlPI controlNote 1. "GR" is a numeric valuerepresenting the currentbalanced condition andcalculated from targetcondensing temperature,target evaporatingtemperature, currentcondensing temperature,and current evaporatingtemperature.Outdoor unitLeft sideCondenserRight sideCondenserOutdoor unitLeft sideEvaporatorRight side–Outdoor unitLeft sideEvaporatorRight sideEvaporatorOutdoor unitLeft sideEvaporatorRight sideCondenserGR > 25 GR < -20GR > 25GR < -20GR > 15 GR < -10
