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[EnergyPlus_Support] questions about dx vav system

I have two questions here.

First, I am simulating a VAV system with no terminal reheat. I 
specify the supply air temperature to be 12.8oC in cooling season and 
35oC in heating season. According to results I got, it works well in 
cooling season, trying to keep the indoor temperature under 23oC by 
varing the supply air flow rate. While in winter, it keeps heating 
the space to a high temperature. In heating season, the supply air 
flow rate is always at its maximum value. I can not understand why 
the supply air flow rate in heating season does not vary.

Second question is about the iteration. I am using a multispeed DX 
coil. The program terminates when simulating the system in May. There 
is a fatal error which says the iteration limit is exceeded when 
calculating the speed of the compressor. I have no idea how to 
resolve the problem.

I have uploaded the file named BOX4_VAV.idf to the files area.


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