I have a model with some heat-only fan coil units with electric heating coils. I have scheduled OFF for all hours the availability of the cooling coil, and have set the fan coil unit "maximum cold water flow rate" at zero to prevent cooling.
Results show that when the zone served gets hot, the electric heating coil is operating, exasperating the zone overheating.
It seems that I can use an availability schedule to try to make the heating coil unavailable during the summer, but is there another setting in the fan coil input that I should change to fix this? It seems like the problem shouldn't require availability schedules to solve. Thanks for any suggestions.
Here are the input objects for the Fancoil:
ZoneHVAC:EquipmentList,
L04Fire422:L04Fire422 Equipment, !- Name
ZoneHVAC:FourPipeFanCoil,!- Zone Equipment 1 Object Type
L04Fire422:L04Fire422 WH403 Fan Coil Unit, !- Zone Equipment 1 Name
1, !- Zone Equipment 1 Cooling Priority
1; !- Zone Equipment 1 Heating Priority
ZoneHVAC:FourPipeFanCoil,
L04Fire422:L04Fire422 WH403 Fan Coil Unit, !- Name
, !- Availability Schedule Name
CyclingFan, !- Capacity Control Method
Autosize, !- Maximum Supply Air Flow Rate {m3/s}
0.33, !- Low Speed Supply Air Flow Ratio
0.66, !- Medium Speed Supply Air Flow Ratio
0, !- Maximum Outdoor Air Flow Rate {m3/s}
, !- Outside Air Schedule Name
L04Fire422:L04Fire422 FCU Inlet Node, !- Air Inlet Node Name
L04Fire422:L04Fire422 FCU Outlet Node, !- Air Outlet Node Name
OutdoorAir:Mixer, !- Outdoor Air Mixer Object Type
L04Fire422:L04Fire422 FCU OA Mixer, !- Outdoor Air Mixer Name
Fan:OnOff, !- Supply Air Fan Object Type
L04Fire422:L04Fire422 FCU Fan, !- Fan Name
Coil:Cooling:Water, !- Cooling Coil Object Type
L04Fire422:L04Fire422 FCU Cooling Coil, !- Cooling Coil Name
0, !no cooling !- Maximum Cold Water Flow Rate {m3/s}
0.0, !- Minimum Cold Water Flow Rate {m3/s}
0.001, !- Cooling Convergence Tolerance
Coil:Heating:Electric, !- Heating Coil Object Type
L04Fire422:L04Fire422 FCU Heating Coil, !- Heating Coil Name
Autosize, !- Maximum Hot Water Flow Rate {m3/s}
0.0, !- Minimum Hot Water Flow Rate {m3/s}
0.001; !- Heating Convergence Tolerance
OutdoorAir:Mixer,
L04Fire422:L04Fire422 FCU OA Mixer, !- Name
L04Fire422:L04Fire422 FCU Mixer Outlet Node, !- Mixed Air Node Name
L04Fire422:L04Fire422 FCU Mixer OA Node, !- Outdoor Air Stream Node Name
L04Fire422:L04Fire422 FCU Mixer Relief Node, !- Relief Air Stream Node Name
L04Fire422:L04Fire422 FCU Inlet Node; !- Return Air Stream Node Name
OutdoorAir:Node,
L04Fire422:L04Fire422 FCU Mixer OA Node; !- Name
Fan:OnOff,
L04Fire422:L04Fire422 FCU Fan, !- Name
Always 1, !- Availability Schedule Name
1, !- Fan Efficiency
91.292019454913, !- Pressure Rise {Pa}
Autosize, !- Maximum Flow Rate {m3/s}
0.7, !- Motor Efficiency
1.0, !- Motor In Airstream Fraction
L04Fire422:L04Fire422 FCU Mixer Outlet Node, !- Air Inlet Node Name
L04Fire422:L04Fire422 FCU Fan Outlet Node; !- Air Outlet Node Name
Coil:Cooling:Water,
L04Fire422:L04Fire422 FCU Cooling Coil, !- Name
Always 0, !- Availability Schedule Name
Autosize, !- Design Water Flow Rate {m3/s}
Autosize, !- Design Air Flow Rate {m3/s}
Autosize, !- Design Inlet Water Temperature {C}
Autosize, !- Design Inlet Air Temperature {C}
Autosize, !- Design Outlet Air Temperature {C}
Autosize, !- Design Inlet Air Humidity Ratio {kg-H2O/kg-air}
Autosize, !- Design Outlet Air Humidity Ratio {kg-H2O/kg-air}
L04Fire422:L04Fire422 FCU Cooling Coil ChW Inlet Node, !- Water Inlet Node Name
L04Fire422:L04Fire422 FCU Cooling Coil ChW Outlet Node, !- Water Outlet Node Name
L04Fire422:L04Fire422 FCU Fan Outlet Node, !- Air Inlet Node Name
L04Fire422:L04Fire422 FCU Cooling Coil Outlet Node, !- Air Outlet Node Name
DetailedAnalysis, !- Type of Analysis
CrossFlow, !- Heat Exchanger Configuration
; !- Condensate Collection Water Storage Tank Name
Branch,
L04Fire422:L04Fire422 Cooling Coil ChW Demand Branch, !, !- Name
, !- Pressure Drop Curve Name
Coil:Cooling:Water, !- Component 1 Object Type
L04Fire422:L04Fire422 FCU Cooling Coil, !- Component 1 Name
L04Fire422:L04Fire422 FCU Cooling Coil ChW Inlet Node, !- Component 1 Inlet Node Name
L04Fire422:L04Fire422 FCU Cooling Coil ChW Outlet Node; !- Component 1 Outlet Node Name
Coil:Heating:Electric,
L04Fire422:L04Fire422 FCU Heating Coil, !- Name
, !- Availability Schedule Name
1.0, !- Efficiency
1000, !- Nominal Capacity {W}
L04Fire422:L04Fire422 FCU Cooling Coil Outlet Node, !- Air Inlet Node Name
L04Fire422:L04Fire422 FCU Outlet Node, !- Air Outlet Node Name
; !- Temperature Setpoint Node Name
