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I figured out the cause by comparing my model and HVACTemplate-5ZoneVRF.idf in ExampleFiles.

The cause was Maximum Outdoor Temperature in Heating Mode in HVACTemplate:System:VRF. The default value is 16ºC. However, if a value that is less than 26.5ºC is input, the WaterCooled VRF doesn't heat zones even when the actual outdoor temperature is much lower than the input value. This might be a bug.

This does not occur when AirCooled is selected as Condenser Type of VRF. The value in HVACTemplate-5ZoneVRF.idf is set to 30ºC (below image), and it runs fine. My model used default 16ºC.

C:\fakepath\Screencapture_ HVACTemplate-5ZoneVRF.jpg

I figured out the cause by comparing my model and HVACTemplate-5ZoneVRF.idf in ExampleFiles.

The cause was Maximum Outdoor Temperature in Heating Mode in HVACTemplate:System:VRF. The default value is 16ºC. However, if a value that is less than 26.5ºC is input, the WaterCooled VRF doesn't heat zones even when the actual outdoor temperature is much lower than the input value. This might be a bug.

This does not occur when AirCooled is selected as Condenser Type of VRF. The value is set to 30ºC in HVACTemplate-5ZoneVRF.idf is set to 30ºC (below image), and it runs fine. My model used default 16ºC.

C:\fakepath\Screencapture_ HVACTemplate-5ZoneVRF.jpg

I figured out the cause by comparing my model and HVACTemplate-5ZoneVRF.idf in ExampleFiles.

The cause was Maximum Outdoor Temperature in Heating Mode in HVACTemplate:System:VRF. The default value is 16ºC. However, if a value that is less than 26.5ºC is input, the WaterCooled VRF doesn't heat zones even when the actual outdoor temperature is much lower than the input value. This might be a bug.

This does not occur when AirCooled is selected as Condenser Type of VRF. The value is set to 30ºC in HVACTemplate-5ZoneVRF.idf (below image), and it runs fine. My model used default 16ºC.16ºC. When I changed it to 26.5°C or higher, my model started to heat zones in winter.

C:\fakepath\Screencapture_ HVACTemplate-5ZoneVRF.jpg

I figured out the cause by comparing my model and HVACTemplate-5ZoneVRF.idf in ExampleFiles.

The cause was Maximum Outdoor Temperature in Heating Mode in HVACTemplate:System:VRF. The default value is 16ºC. However, if a value that is less than 26.5ºC is input, the WaterCooled VRF doesn't heat zones even when the actual outdoor temperature is much lower than the input value. This might be a bug.

This does not occur when AirCooled is selected as Condenser Type of VRF. The value is set to 30ºC in HVACTemplate-5ZoneVRF.idf (below image), and it runs fine. My model used default 16ºC. When I changed it to 26.5°C 26.5ºC or higher, my model started to heat zones in winter.winter. Conversely, when I changed the value to less than 26.5ºC in HVACTemplate-5ZoneVRF.idf, the model stopped heating.

C:\fakepath\Screencapture_ HVACTemplate-5ZoneVRF.jpg