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[EnergyPlus_Support] Question on example file 5ZoneVAV-Pri-SecLoop.idf

In this example file, there is a cooling and a heating supply air 
temperature set point managers. First, I do not really understand how 
these two set point managers work. How does the program determine 
which one to take effect during the simulation? Second, why is the 
heating supply air temperature 10oC, but the cooling supply air 
temperature 14oC?

! NOTE:  Heating supply air setpoint is placed on Supply Path Inlet 
node to allow separate heating and cooling setpoints.
! SET POINT MANAGER:MIXED AIR <system name> Heating Coil Air 
Temp Manager adjusts this setpoint for fan heat and places it on the 
Heating Coil Outlet
 
  SET POINT MANAGER:SCHEDULED,
    VAV Sys 1 Heating Supply Air Temp Manager,  !- Name
    TEMP,                    !- Control variable
    COMPACT HVAC-ALWAYS 10.0,!- Schedule Name
    VAV Sys 1 Supply Path Inlet;  !- Name of the set point Node or 
Node List

  SET POINT MANAGER:SCHEDULED,
    VAV Sys 1 Cooling Supply Air Temp Manager,  !- Name
    TEMP,                    !- Control variable
    COMPACT HVAC-ALWAYS 14,  !- Schedule Name
    VAV Sys 1 Supply Fan Outlet;  !- Name of the set point Node or 
Node List



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