No Heating from PVVT Heat Pump

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I am trying to model a PVVT system, that uses an air-cooled heat pump for
heating and cooling. For some reason, the system refuses to supply any heating.
When I change the condenser type from air-cooled to water-cooled, the system
WILL provide heat. Has anyone experienced problems like this, or has
someone successful modeled a PVVT air-cooled heat pump? I have attached my IDF
and PD2 file for review.

Eddie Corwin's picture
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Joined: 2011-09-30
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