1) Yes, it can be used with ZoneHVAC:IdealLoadsAirSystem.
From the Energy+.idd, you can see the list of acceptable equipment:
RoomAir:Node:AirflowNetwork:HVACEquipment,
\extensible:4
\memo define the zone equipment associated with one particular RoomAir:Node
A1, \field Name
\type alpha
\reference RoomAirNodeHVACEquipment
A2, \field ZoneHVAC or Air Terminal Equipment Object Type 1
\begin-extensible
\type choice
\key ZoneHVAC:TerminalUnit:VariableRefrigerantFlow
\key ZoneHVAC:EnergyRecoveryVentilator
\key ZoneHVAC:FourPipeFanCoil
\key ZoneHVAC:OutdoorAirUnit
\key ZoneHVAC:PackagedTerminalAirConditioner
\key ZoneHVAC:PackagedTerminalHeatPump
\key ZoneHVAC:UnitHeater
\key ZoneHVAC:UnitVentilator
\key ZoneHVAC:VentilatedSlab
\key ZoneHVAC:WaterToAirHeatPump
\key ZoneHVAC:WindowAirConditioner
\key ZoneHVAC:Baseboard:RadiantConvective:Electric
\key ZoneHVAC:Baseboard:RadiantConvective:Water
\key ZoneHVAC:Baseboard:RadiantConvective:Steam
\key ZoneHVAC:Baseboard:Convective:Electric
\key ZoneHVAC:Baseboard:Convective:Water
\key ZoneHVAC:HighTemperatureRadiant
\key ZoneHVAC:Dehumidifier:DX
\key ZoneHVAC:IdealLoadsAirSystem <===================================== HERE
\key ZoneHVAC:RefrigerationChillerSet
\key Fan:ZoneExhaust
\key WaterHeater:HeatPump
\key AirTerminal:SingleDuct:Uncontrolled
\key AirTerminal:DualDuct:ConstantVolume
\key AirTerminal:DualDuct:VAV
\key AirTerminal:SingleDuct:ConstantVolume:Reheat
\key AirTerminal:SingleDuct:VAV:Reheat
\key AirTerminal:SingleDuct:VAV:NoReheat
\key AirTerminal:SingleDuct:SeriesPIU:Reheat
\key AirTerminal:SingleDuct:ParallelPIU:Reheat
\key AirTerminal:SingleDuct:ConstantVolume:FourPipeInduction
\key AirTerminal:SingleDuct:VAV:Reheat:VariableSpeedFan
\key AirTerminal:SingleDuct:VAV:HeatAndCool:Reheat
\key AirTerminal:SingleDuct:VAV:HeatAndCool:NoReheat
\key AirTerminal:SingleDuct:ConstantVolume:CooledBeam
\key AirTerminal:DualDuct:VAV:OutdoorAir
\key AirLoopHVACReturnAir
2) You have modified the RoomAir:Node:AirflowNetwork:HVACEquipment to use a new ZoneHVAC or Air Terminal Equipment Object Type 1 but failed to update the ZoneHVAC or Air Terminal Equipment Object Name 1 to match the name of the ZoneHVAC:IdealLoadsAirSystem you created, which appears to be named North Zone Ideal Loads Air per your picture.
Original:
RoomAir:Node:AirflowNetwork:HVACEquipment,
LeftUpper_HVAC, !- Name
ZoneHVAC:PackagedTerminalAirConditioner, !- ZoneHVAC or Air Terminal Equipment Object Type 1
NORTH_ZONE PTAC, !- ZoneHVAC or Air Terminal Equipment Object Name 1
0.04, !- Fraction of Output or Supply Air from HVAC Equipment 1
0.04; !- Fraction of Input or Return Air to HVAC Equipment 1
You need to modify it to be:
RoomAir:Node:AirflowNetwork:HVACEquipment,
LeftUpper_HVAC, !- Name
ZoneHVAC:IdealLoadsAirSystem, !- ZoneHVAC or Air Terminal Equipment Object Type 1
North Zone Ideal Loads Air, !- ZoneHVAC or Air Terminal Equipment Object Name 1
0.04, !- Fraction of Output or Supply Air from HVAC Equipment 1
0.04; !- Fraction of Input or Return Air to HVAC Equipment 1
