Thanks for your answer but in PTHP we only have ZoneHVAC:PackagedTerminalHeatPump, which accommodates coils, fans etc. and we don't have specifically indoor and outdoor units. If I replace ZoneHVAC:TerminalUnit:VariableRefrigerantFlow with ZoneHVAC:PackagedTerminalHeatPump, then what will be outdoor unit for PTHP?