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EnergyPlus version 25.1

I am attempting to provide heating using an air-source heat pump for outdoor air temperatures down to -10°C. Below this, a boiler will provide heating to my hot water loop. From the error message shown below, it suggests that negative values are not allowable as an upper limit.

from .err:

* Severe * PlantEquipmentOperationSchemes = "HWL OPERATION", found a negative value for an upper limit in PlantEquipmentOperation:OutdoorDryBulb = "HWL OA CTRL".

* Fatal * LoadEquipList/GetEquipmentLists: Failed due to preceding errors.

my .idf:

PlantEquipmentOperation:OutdoorDryBulb,

HWL OA Ctrl,             !- Name
-70,                     !- Dry-Bulb Temperature Range 1 Lower Limit {C}
-10,                     !- Dry-Bulb Temperature Range 1 Upper Limit {C}
HWL Boiler,              !- Range 1 Equipment List Name
-10,                     !- Dry-Bulb Temperature Range 2 Lower Limit {C}
70,                      !- Dry-Bulb Temperature Range 2 Upper Limit {C}
HWL All Equipment;       !- Range 2 Equipment List Name

Can I not use negative number in my OA ranges in the PlantEquipmentOperation:OutdoorDryBulb element?

Many thanks for suggestions/observations.

EnergyPlus version 25.1

I am attempting to provide heating using an air-source heat pump for outdoor air temperatures down to -10°C. Below this, a boiler will provide heating to my hot water loop. From the error message shown below, it suggests that negative values are not allowable as an upper limit.

from .err:

* Severe * PlantEquipmentOperationSchemes = "HWL OPERATION", found a negative value for an upper limit in PlantEquipmentOperation:OutdoorDryBulb = "HWL OA CTRL".

* Fatal * LoadEquipList/GetEquipmentLists: Failed due to preceding errors.

my .idf:

PlantEquipmentOperation:OutdoorDryBulb,

HWL OA Ctrl,             !- Name
-70,                     !- Dry-Bulb Temperature Range 1 Lower Limit {C}
-10,                     !- Dry-Bulb Temperature Range 1 Upper Limit {C}
HWL Boiler,              !- Range 1 Equipment List Name
-10,                     !- Dry-Bulb Temperature Range 2 Lower Limit {C}
70,                      !- Dry-Bulb Temperature Range 2 Upper Limit {C}
HWL All Equipment;       !- Range 2 Equipment List Name

Can I not use negative number in my OA ranges in the PlantEquipmentOperation:OutdoorDryBulb element?

Many thanks for suggestions/observations.

EnergyPlus version 25.1

I am attempting to provide heating using an air-source heat pump for outdoor air temperatures down to -10°C. Below this, a boiler will provide heating to my hot water loop. From the error message shown below, it suggests that negative values are not allowable as an upper limit.

from .err:

** Severe  * ** PlantEquipmentOperationSchemes = "HWL OPERATION", found a negative value for an upper limit in   PlantEquipmentOperation:OutdoorDryBulb = "HWL OA CTRL".
 
* CTRL".
**  Fatal  * ** LoadEquipList/GetEquipmentLists: Failed due to preceding errors.errors.

PlantEquipmentOperation:OutdoorDryBulb,

HWL OA Ctrl,             !- Name
-70,                     !- Dry-Bulb Temperature Range 1 Lower Limit {C}
-10,                     !- Dry-Bulb Temperature Range 1 Upper Limit {C}
HWL Boiler,              !- Range 1 Equipment List Name
-10,                     !- Dry-Bulb Temperature Range 2 Lower Limit {C}
70,                      !- Dry-Bulb Temperature Range 2 Upper Limit {C}
HWL All Equipment;       !- Range 2 Equipment List Name

EnergyPlus version 25.1

I am attempting to provide heating using an air-source heat pump for outdoor air temperatures down to -10°C. Below this, a boiler will provide heating to my hot water loop. From the error message shown below, it suggests that negative values are not allowable as an upper limit.

from .err:

** Severe  ** PlantEquipmentOperationSchemes = "HWL OPERATION", found a negative value for an upper limit in   PlantEquipmentOperation:OutdoorDryBulb = "HWL OA CTRL".
**  Fatal  ** LoadEquipList/GetEquipmentLists: Failed due to preceding errors.

my .idf:

PlantEquipmentOperation:OutdoorDryBulb,

HWL OA Ctrl,             !- Name
-70,                     !- Dry-Bulb Temperature Range 1 Lower Limit {C}
-10,                     !- Dry-Bulb Temperature Range 1 Upper Limit {C}
HWL Boiler,              !- Range 1 Equipment List Name
-10,                     !- Dry-Bulb Temperature Range 2 Lower Limit {C}
70,                      !- Dry-Bulb Temperature Range 2 Upper Limit {C}
HWL All Equipment;       !- Range 2 Equipment List Name

Can I not use negative number in my OA ranges in the PlantEquipmentOperation:OutdoorDryBulb element?

Many thanks for suggestions/observations.

EnergyPlus version 25.1

I am attempting to provide heating using an air-source heat pump for outdoor air temperatures down to -10°C. Below this, a boiler will provide heating to my hot water loop. From the error message shown below, it suggests that negative values are not allowable as an upper limit.

from .err:

** Severe  ** PlantEquipmentOperationSchemes = "HWL OPERATION", found a negative value for an upper limit in   PlantEquipmentOperation:OutdoorDryBulb = "HWL OA CTRL".
**  Fatal  ** LoadEquipList/GetEquipmentLists: Failed due to preceding errors.

my .idf:

PlantEquipmentOperation:OutdoorDryBulb,

HWL OA Ctrl,             !- Name
-70,                     !- Dry-Bulb Temperature Range 1 Lower Limit {C}
-10,                     !- Dry-Bulb Temperature Range 1 Upper Limit {C}
HWL Boiler,              !- Range 1 Equipment List Name
-10,                     !- Dry-Bulb Temperature Range 2 Lower Limit {C}
70,                      !- Dry-Bulb Temperature Range 2 Upper Limit {C}
HWL All Equipment;       !- Range 2 Equipment List Name

Can I not use negative number in my OA ranges in the PlantEquipmentOperation:OutdoorDryBulb element?

Note that I did try the PlantEquipementOperation:OutdoorDryBulb in the oppsite order (warmest range first) with the same result and error message.

Many thanks for suggestions/observations.