Cannot specify fixed flows for all branches of internal ductnode

[Prometeo-ianic]

Hi all,
I have these two fan, with 1 jet fan the simulation runs, without
I get this error
ERROR(553): Cannot specify fixed flows for all branches of internal ductnode:Center Node 02 .

&DEVC ID='TIMER->OUT', QUANTITY='TIME', XYZ=0.0,0.0,0.0, SETPOINT=2.0/

&VENT ID='Inlet02', SURF_ID='HVAC', XB=38.2,38.6,46.3,46.3,2.4,2.8/
&VENT ID='Outlet02', SURF_ID='HVAC', XB=38.2,38.6,48.3,48.3,2.4,2.8, IOR=2/
&VENT ID='Inlet01', SURF_ID='HVAC', XB=27.6,28.0,45.8,45.8,2.4,2.8/
&VENT ID='Outlet01', SURF_ID='HVAC', XB=27.6,28.0,47.8,47.8,2.4,2.8/

&HVAC ID='Inlet Node 01', TYPE_ID='NODE', DUCT_ID='Duct_01_01', VENT_ID='Inlet01'/
&HVAC ID='Center Node 01', TYPE_ID='NODE', DUCT_ID='Duct_01_01','Duct_02_01', XYZ=27.8,46.8,2.6/
&HVAC ID='Outlet Node 01', TYPE_ID='NODE', DUCT_ID='Duct_02_01', VENT_ID='Outlet01'/
&HVAC ID='Duct_01_01', TYPE_ID='DUCT', DIAMETER=0.355, NODE_ID='Inlet Node 01','Center Node 01', ROUGHNESS=1.0E-3, LENGTH=0.990131, DEVC_ID='TIMER->OUT'/
&HVAC ID='Duct_02_01', TYPE_ID='DUCT', DIAMETER=0.355, FAN_ID='FAN_01', NODE_ID='Center Node 01','Outlet Node 01', ROUGHNESS=1.0E-3, LENGTH=1.009869, DEVC_ID='TIMER->OUT'/
&HVAC ID='Inlet Node 02', TYPE_ID='NODE', DUCT_ID='Duct_01_02', VENT_ID='Inlet02'/
&HVAC ID='Center Node 02', TYPE_ID='NODE', DUCT_ID='Duct_01_02','Duct_02_02', XYZ=38.4,47.3,2.6/
&HVAC ID='Outlet Node 02', TYPE_ID='NODE', DUCT_ID='Duct_02_02', VENT_ID='Outlet02'/
&HVAC ID='Duct_01_02', TYPE_ID='DUCT', DIAMETER=0.355, NODE_ID='Inlet Node 02','Center Node 02', ROUGHNESS=1.0E-3, DEVC_ID='TIMER->OUT'/
&HVAC ID='Duct_02_02', TYPE_ID='DUCT', DIAMETER=0.355, FAN_ID='FAN_02', NODE_ID='Center Node 02','Outlet Node 02', ROUGHNESS=1.0E-3, DEVC_ID='TIMER->OUT'/
&HVAC ID='FAN_01', TYPE_ID='FAN', TAU_FAN=-60.0, VOLUME_FLOW=3.136/
&HVAC ID='FAN_02', TYPE_ID='FAN', TAU_FAN=-60.0, VOLUME_FLOW=3.136/

What I am doing wrong? At the beginning I thought it was the fact that I should have used a different &HVAC ID for each fun, but it didn't work.
Thank you in advance

[mcgratta]

ERROR(553): Cannot specify fixed flows for all branches of internal ductnode:Center Node 02 .

What does the error code say?

[drjfloyd]

I've tried making a simple case that has the same topology for the HVAC network but I don't get an error. Can you attach your full input?

[Prometeo-ianic]

I did the same, and I start progressively deleting things until the problem disappear. I find that some obstruction over the jet fans that I used to avoid lateral dispersion of the flow rate gave this problem, that some years ago did not happen. Thank you for the help. I really appreciate

[drjfloyd]

Can you still provide the input file? If this was due to an obstruction blocking the VENT, then I'd want to see if we can throw a more meaningful error message.

[Prometeo-ianic]

JetFan.txt
Sorry, but the file was too large and I had to simplify it as much as I can

[drjfloyd]

The case you attached runs for me with FDS 6.9.1. Are you running an older version?