VRF outdoor unit max_net_vert_distance calculation

[JanghyunJK]

background

• noticed there is a line like this below when calculating Vertical Height used for Piping Correction Factor for AirConditioner:VariableRefrigerantFlow object

  max_net_vert_distance = [max_net_vert_distance, 0.000001].max
  

• which was not letting max_net_vert_distance to be a negative value

• but EP documentation example shows max_net_vert_distance can be a negative value. for example, if your VRF outdoor unit is located on the roof, and all of your indoor units are below the roof, max_net_vert_distance becomes a negative value.

change summary

• so this change is basically removing one line.

• cc-ing: @khaddad

[mdahlhausen]

check if the value can be zero. if so, remove the check

[JanghyunJK]

did a test by varying max_net_vert_distance from -50 to 50 meters (and including zero) for the same model and looks like setting max_net_vert_distance to zero does not throw any error. so, removing the if statement for zero.

[mdahlhausen]

cool. I'll wait for the tests to run then merge asap.