diff --git a/openstudiocore/src/model/ScheduleTypeRegistry.cpp b/openstudiocore/src/model/ScheduleTypeRegistry.cpp
index d4552cc8942..d86a89645ac 100644
--- a/openstudiocore/src/model/ScheduleTypeRegistry.cpp
+++ b/openstudiocore/src/model/ScheduleTypeRegistry.cpp
@@ -251,8 +251,8 @@ ScheduleTypeRegistrySingleton::ScheduleTypeRegistrySingleton()
     {"ElectricEquipment","Electric Equipment","schedule",true,"",0.0,1.0},
     {"ElectricEquipmentITEAirCooled", "Design Power Input", "designPowerInputSchedule", true, "", 0.0, 1.0},
     {"ElectricEquipmentITEAirCooled", "CPU Loading", "cPULoadingSchedule", true, "", 0.0, 1.0},
-    {"ElectricEquipmentITEAirCooledDefinition", "Supply Temperature Difference Schedule", "supplyTemperatureDifferenceSchedule", true, "Temperature", 0.0, 50.0},
-    {"ElectricEquipmentITEAirCooledDefinition", "Return Temperature Difference Schedule", "returnTemperatureDifferenceSchedule", true, "Temperature", -50.0, 0.0},
+    {"ElectricEquipmentITEAirCooledDefinition", "Supply Temperature Difference Schedule", "supplyTemperatureDifferenceSchedule", true, "Temperature",0.0,OptionalDouble()},
+    {"ElectricEquipmentITEAirCooledDefinition", "Return Temperature Difference Schedule", "returnTemperatureDifferenceSchedule", true, "Temperature",OptionalDouble(),0.0},
     {"ElectricLoadCenterDistribution", "Track  Scheme", "trackScheduleSchemeSchedule",true,"",0.0,OptionalDouble()},
     {"ElectricLoadCenterDistribution", "Storage Charge Power Fraction", "storageChargePowerFractionSchedule",true,"",0.0,1.0},
     {"ElectricLoadCenterDistribution", "Storage Discharge Power Fraction", "storageDischargePowerFractionSchedule",true,"",0.0,1.0},