I've got this error:
** Severe ** WaterHeater:HeatPump:WrappedCondenser = PLANTHEATPUMPWATERHEATER:
** ~~~ ** Heater Control Type for WaterHeater:Stratified = WATER HEATER TANK must be CYCLE.
on a fairly simple model, where I have I think completely copied the heat pump water heater components from the WaterHeaterHeatPumpWrappedCondensor example file (which has both a wrapped condenser heater and a stratified water heater tank, just like my model). This is why this error is confusing me, because it says the tank must have a cycle control, but that is only available in a WaterHeater:Mixed, not a WaterHeater:Stratefied - and somehow this combination is working fine int he example file. I wasn't able to find anything explaining the requirement in the documentation, so I'm at a bit of a loss. Any idea what might trigger this requirement in the heat pump settings or somewhere else? Just in case, here is my full text for those two objects:
WaterHeater:Stratified,
Water Heater Tank, !- Name
Water Heater, !- End-Use Subcategory
0.287691, !- Tank Volume {m3}
1.594, !- Tank Height {m}
VerticalCylinder, !- Tank Shape
, !- Tank Perimeter {m}
100, !- Maximum Temperature Limit {C}
Simultaneous, !- Heater Priority Control
WaterHeaterElec Setpoint Temp, !- Heater 1 Setpoint Temperature Schedule Name
18.5, !- Heater 1 Deadband Temperature Difference {deltaC}
4500, !- Heater 1 Capacity {W}
1.129, !- Heater 1 Height {m}
WaterHeaterElec Setpoint Temp, !- Heater 2 Setpoint Temperature Schedule Name
18.5, !- Heater 2 Deadband Temperature Difference {deltaC}
0, !- Heater 2 Capacity {W}
0.266, !- Heater 2 Height {m}
Electricity, !- Heater Fuel Type
1, !- Heater Thermal Efficiency
8.3, !- Off Cycle Parasitic Fuel Consumption Rate {W}
Electricity, !- Off Cycle Parasitic Fuel Type
0, !- Off Cycle Parasitic Heat Fraction to Tank
1, !- Off Cycle Parasitic Height {m}
8.3, !- On Cycle Parasitic Fuel Consumption Rate {W}
Electricity, !- On Cycle Parasitic Fuel Type
0, !- On Cycle Parasitic Heat Fraction to Tank
1, !- On Cycle Parasitic Height {m}
Zone, !- Ambient Temperature Indicator
, !- Ambient Temperature Schedule Name
CorridorFlr2 Thermal Zone, !- Ambient Temperature Zone Name
, !- Ambient Temperature Outdoor Air Node Name
0.7878, !- Uniform Skin Loss Coefficient per Unit Area to Ambient Temperature {W/m2-K}
1, !- Skin Loss Fraction to Zone
, !- Off Cycle Flue Loss Coefficient to Ambient Temperature {W/K}
1, !- Off Cycle Flue Loss Fraction to Zone
, !- Peak Use Flow Rate {m3/s}
, !- Use Flow Rate Fraction Schedule Name
, !- Cold Water Supply Temperature Schedule Name
Water Heater Use Inlet Node, !- Use Side Inlet Node Name
Water Heater Use Outlet Node, !- Use Side Outlet Node Name
1, !- Use Side Effectiveness
0, !- Use Side Inlet Height {m}
autocalculate, !- Use Side Outlet Height {m}
, !- Source Side Inlet Node Name
, !- Source Side Outlet Node Name
, !- Source Side Effectiveness
, !- Source Side Inlet Height {m}
, !- Source Side Outlet Height {m}
Fixed, !- Inlet Mode
autosize, !- Use Side Design Flow Rate {m3/s}
autosize, !- Source Side Design Flow Rate {m3/s}
1.5, !- Indirect Water Heating Recovery Time {hr}
12; !- Number of Nodes
WaterHeater:HeatPump:WrappedCondenser,
PlantHeatPumpWaterHeater,!- Name
, !- Availability Schedule Name
WaterHeaterGas Setpoint Temp, !- Compressor Setpoint Temperature Schedule Name
3.89, !- Dead Band Temperature Difference {deltaC}
0.0664166667, !- Condenser Bottom Location {m}
0.8634166667, !- Condenser Top Location {m}
0.2279, !- Evaporator Air Flow Rate {m3/s}
OutdoorAirOnly, !- Inlet Air Configuration
, !- Air Inlet Node Name
, !- Air Outlet Node Name
HPPlantAirInletNode, !- Outdoor Air Node Name
HPPlantFanAirOutletNode, !- Exhaust Air Node Name
, !- Inlet Air Temperature Schedule Name
, !- Inlet Air Humidity Schedule Name
, !- Inlet Air Zone Name
WaterHeater:Stratified, !- Tank Object Type
Water Heater Tank, !- Tank Name
Water Heater Use Inlet Node, !- Tank Use Side Inlet Node Name
Water Heater Use Outlet Node, !- Tank Use Side Outlet Node Name
Coil:WaterHeating:AirToWaterHeatPump:Wrapped, !- DX Coil Object Type
HPWHPlantDXCoil, !- DX Coil Name
7.2, !- Minimum Inlet Air Temperature for Compressor Operation {C}
48.89, !- Maximum Inlet Air Temperature for Compressor Operation {C}
Outdoors, !- Compressor Location
, !- Compressor Ambient Temperature Schedule Name
Fan:SystemModel, !- Fan Object Type
HPWHFan, !- Fan Name
DrawThrough, !- Fan Placement
0, !- On Cycle Parasitic Electric Load {W}
0, !- Off Cycle Parasitic Electric Load {W}
, !- Parasitic Heat Rejection Location
, !- Inlet Air Mixer Node Name
, !- Outlet Air Splitter Node Name
, !- Inlet Air Mixer Schedule Name
MutuallyExclusive, !- Tank Element Control Logic
1.262, !- Control Sensor 1 Height In Stratified Tank {m}
0.75, !- Control Sensor 1 Weight {dimensionless}
0.464; !- Control Sensor 2 Height In Stratified Tank {m}
