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[EnergyPlus_Support] warning about "COOLING TOWER:VARIABLE SPEED"

Hi all,

I try to run the example file "CoolingTower_VariableSpeed.idf".  It is
OK if this just did two design days. After I changed run period from
two days to the whole year, there are 6783 warning. 

I am not sure whether these warnings are serious. 
Any suggestions would be greatly appreciated.

Thanks a lot.

Tj Ywh


"
  ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL TOWER" - Tower
range temperature is outside model boundaries at  0.10.
   **   ~~~   **  ...Valid range =  1.11 to 22.22. Occurrence info =
CHICAGO IL USA TMY2-94846 WMO#=725300, 04/01 07:00 - 07:01
   **   ~~~   **  ...Tower range temperature passed to the model = 
0.10416
   **   ~~~   **  ...Range temperatures outside model boundaries may
not adversely affect tower performance.
   **   ~~~   **  ...This is not an unexpected occurrence when
simulating actual conditions.
   ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL TOWER" -
Cooling tower air flow rate ratio calculation failed
   **   ~~~   ** ...with conditions as Twb = 13.07, Trange =  0.41,
Tapproach = 16.93, and water flow rate ratio =  3.34
   **   ~~~   ** ...a solution could not be found within the valid
range of air flow rate ratios
   **   ~~~   **  ...Valid air flow rate ratio range =  0.20 to 1.0.
Occurrence info=CHICAGO IL USA TMY2-94846 WMO#=725300, 04/03 11:45 - 11:47
   **   ~~~   ** ...Consider modifying the design approach or design
range temperature for this tower.
   ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL TOWER" - Liquid
to gas ratio (L/G) is out of range at 11.17.
   **   ~~~   **  ...Valid maximum ratio =  8.00. Occurrence info =
CHICAGO IL USA TMY2-94846 WMO#=725300, 04/03 12:30 - 12:45
   *************
   ************* ===== Recurring Error Summary =====
   ************* The following recurring error messages occurred.
   *************
   *************  ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL
TOWER" - Tower range temperature is out of range error continues...
   *************  **   ~~~   **   This error occurred 4742 times.
   *************  **   ~~~   **   Max=1.110559  Min=5.492994E-002
   *************
   *************  ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL
TOWER" - Cooling tower air flow rate ratio calculation failed error
continues.
   *************  **   ~~~   **   This error occurred 526 times.
   *************
   *************  ** Warning ** COOLING TOWER:VARIABLE SPEED "CENTRAL
TOWER" - Liquid to gas ratio is out of range error continues...
   *************  **   ~~~   **   This error occurred 1512 times.
   *************  **   ~~~   **   Max=16.058515  Min=8.001353
   *************
   ************* EnergyPlus Completed Successfully-- 6783 Warning; 0
Severe Errors; Elapsed Time=00hr 00min 47.60sec
"



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