SiUS34-801A_b Basic ControlVRVIII R-410A Heat Pump 60Hz 496.6 Heat Exchanger ControlIn case of multi outdoor unit systems, this function is used to ensure condensing and evaporatingtemperatures by changing over the air heat exchanger of the outdoor unit to the evaporator or thecondenser in response to loads while in heating operation.[Multi outdoor unit system][RXYQ144PTJU]GR > 15 GR < -10A1A2Outdoor unit Note 1. "GR" is a numeric value representing the current balancedcondition and calculated from target condensing temperature,target evaporating temperature, current condensingtemperature, and current evaporating temperature.Note 2. On the system with two outdoor units, if there is no step for thedestination of transition, that step will be skipped.1Condenser2CondenserB1 Outdoor unit1–2EvaporatorOutdoor unit1Condenser2CondenserOutdoor unit1Condenser2CondenserOutdoor unit1Condenser2EvaporatorGR > 25 GR < -20GR > 25GR < -20GR > 25A3GR > 15 GR < -10B2 Outdoor unit1Evaporator2EvaporatorOutdoor unit1Evaporator2EvaporatorGR > 15 GR < -10B3A4GR > 15 GR < -10Note 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
