I have an eQUEST VRF model using PVVT and variable speed compressors as a
workaround. The model had the condenser set as air cooled. In the course
of a design meeting I learned that the VRF system was to have a water cooled
condenser loop for the condenser units. No problem I thought and happily
changed the condenser source on my PVVT units from air-cooled to
water-cooled. In doing so however, no heat was added to or rejected to the
WLHP loop from the units. The only way I could have my pseudo PVVT/VRF
units interact with the condenser loop was to turn the compressor control
from "variable speed" to "single speed". No underheated/undercooled hours
were reported, but no load was carried on the condenser loop. Have others
had this experience? Suggestions?