[EnergyPlus_Support] Economizer does not function properly

["JV Dirkes II" <jvd2pe@xxxxxxx>]

Dear E+ Forum,

The air handler in my current model has an economizer which is staying
 at the fixed minimum position at all times on the Winter Design Day.
 As a result, the cooling coil operates to create the discharge air
temperature setpoint.  I expect that the economizer should increase
the outdoor air flow to accomplish the same result, but it does not.

I've shown the critical objects below and hope someone can direct me
to the problem.  Thank you!

p.s., I will upload it, too.

BRANCH,
    Branch_AirLoop_AH1,      !- Branch Name
    Autosize,                !- Maximum Branch Flow Rate {m3/s}
    OUTSIDE AIR SYSTEM,      !- Comp1 Type
    OASystem_AH1,            !- Comp1 Name
    NodeOut_RFan_AH1,        !- Comp1 Inlet Node Name
    NodeOut_MA_AH1,          !- Comp1 Outlet Node Name
    PASSIVE,                 !- Comp1 Branch Control Type
    DXSystem:AirLoop,        !- Comp2 Type
    DXAirLoop_AH1,           !- Comp2 Name
    NodeOut_MA_AH1,          !- Comp2 Inlet Node Name
    NodeOut_ClgCoilAir_AH1,  !- Comp2 Outlet Node Name
    PASSIVE,                 !- Comp2 Branch Control Type
    FAN:SIMPLE:VARIABLEVOLUME,  !- Comp3 Type
    SFan_AH1,                !- Comp3 Name
    NodeOut_ClgCoilAir_AH1,  !- Comp3 Inlet Node Name
    NodeOut_SF_AH1,          !- Comp3 Outlet Node Name
    ACTIVE,                  !- Comp3 Branch Control Type
    COIL:WATER:SIMPLEHEATING,!- Comp4 Type
    HtgCoil_AH1,             !- Comp4 Name
    NodeOut_SF_AH1,          !- Comp4 Inlet Node Name
    NodeOut_Air_AH1,         !- Comp4 Outlet Node Name
    PASSIVE;                 !- Comp4 Branch Control Type

SET POINT MANAGER:MIXED AIR,
    SPMgr_MixedAir_AH1,      !- Name
    TEMP,                    !- Control variable:
    NodeOut_Air_AH1,         !- reference set point node name
    NodeOut_ClgCoilAir_AH1,  !- fan inlet node name
    NodeOut_SF_AH1,          !- fan outlet node name
    NodeOut_MA_AH1;          !- Name of the set point Node or Node List

CONTROLLER:OUTSIDE AIR,
    OAController_AH1,        !- Name
    ECONOMIZER,              !- EconomizerChoice
    RETURN AIR TEMP LIMIT,   !- ReturnAirTempLimit
    NO RETURN AIR ENTHALPY LIMIT,  !- ReturnAirEnthalpyLimit
    NO LOCKOUT,              !- Lockout
    FIXED MINIMUM,           !- MinimumLimit
    NodeOut_MA_AH1,          !- Control_Node
    NodeIn_OA_AH1,           !- Actuated_Node
    Autosize,                !- minimum outside air flow rate {m3/s}
    Autosize,                !- maximum outside air flow rate {m3/s}
    21.1,                    !- temperature limit {C}
    12.8,                    !- temperature lower limit {C}
    ,                        !- enthalpy limit {J/kg}
    ,                        !- dew point temperature limit {C}
    ,                        !- electronic enthalpy limit curve name
    NodeOut_EA_AH1,          !- Relief_Air_Outlet_Node
    NodeOut_RFan_AH1,        !- Return_Air_Node
    ,                        !- Minimum Outside Air Schedule Name
    ,                        !- Name of VENTILATION:MECHANICAL object
    ,                        !- Time of Day Economizer Control
Schedule Name
    NO,                      !- High Humidity Control Flag
    ParkingLobbies,          !- Humidistat Control Zone Name
    1,                       !- High Humidity Outside Air Flow Ratio
    Yes;                     !- Control High Indoor Humidity based on
Outdoor Humidity Ratio

DXSystem:AirLoop,
    DXAirLoop_AH1,           !- Name of DX Cooling Coil System
    SchCpct_AlwaysOn,        !- Availability schedule
    NodeOut_MA_AH1,          !- DX Cooling Coil System inlet node name
    NodeOut_ClgCoilAir_AH1,  !- DX Cooling Coil System outlet node name
    NodeOut_Air_AH1,         !- DX Cooling Coil System Control Node
    COIL:DX:COOLINGBypassFactorEmpirical,  !- Cooling coil type
    ClgCoil_AH1,             !- Cooling coil name
    None,                    !- Dehumidification Control Type
    Yes,                     !- Run on Sensible Load
    No;                      !- Run on Latent Load

SET POINT MANAGER:SCHEDULED,
    SPMgr_Sched_HC_AH1,      !- Name
    TEMP,                    !- Control variable
    SchCpct_DischAir_AH1,    !- Schedule Name
    NodeOut_Air_AH1;         !- Name of the set point Node or Node List







------------------------------------

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/