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So, the following seems to work reasonably well:

vrfs_in = model.getZoneHVACTerminalUnitVariableRefrigerantFlows
vrfs_in.each do |vrf_in|
  puts vrf_in.name
  cooling_coil = vrf_in.coolingCoil().get
  puts cooling_coil.name
end

However, the following fails, stating that the get method is undefined:

vrfs_in = model.getZoneHVACTerminalUnitVariableRefrigerantFlows
vrfs_in.each do |vrf_in|
  puts vrf_in.name
  supply_air_fan = vrf_in.supplyAirFan().get
end

Yet, both coolingCoil() and supplyAirFan() appear to have identical "status" per this reference, and so I would have thought they both can be treated the same way? Why does it fail for supplyAirFan() but not for coolingCoil()?

So, the following seems to work reasonably well:

vrfs_in = model.getZoneHVACTerminalUnitVariableRefrigerantFlows
vrfs_in.each do |vrf_in|
  puts vrf_in.name
  cooling_coil = vrf_in.coolingCoil().get
  puts cooling_coil.name
end

However, the following fails, stating that the get method is undefined:

vrfs_in = model.getZoneHVACTerminalUnitVariableRefrigerantFlows
vrfs_in.each do |vrf_in|
  puts vrf_in.name
  supply_air_fan = vrf_in.supplyAirFan().get
end

Yet, both coolingCoil() and supplyAirFan() appear to have identical "status" per this reference, and so I would have thought they both can be treated the same way? Why does it fail for supplyAirFan() but not for coolingCoil()?