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[EnergyPlus_Support] How to change max number of HVAC iterations



hi All

Apologies for the stupid question, but I can't seem to change my .idd 
file to increase the max number of HVAC iterations. The following is 
the .idd entry:

System Convergence Limits,
       \unique-object
  N1 , \field Minimum System Time Step
       \units minutes
       \type integer
       \note 0 sets the minimum to the zone time step (ref: TimeStep 
In Hour)
       \note 1 is normal (ratchet down to 1 minute)
       \note setting greater than zone time step (in minutes) will 
effectively set to zone time step
       \minimum 0
       \maximum 60
  N2 ; \field Maximum HVAC Iterations
       \type integer
       \default 20
       \minimum 1

Now I've gone ahead and changed the second last line to :

       \default 50

But I still get the same errors, and it still tells me that 20 is the 
maximum number of iterations. 

So how do I chane the maximum number of HVAC iterations?

cheers
Danny



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