I have a site that has several Intellipaks (Vintage 1994). They are VAV units with gas heat. They still have an older Tracer 100 BMS on the system. My question is about the gas heat. The units run 24/7, so MWU is not an issue, but I thought gas heat was enabled when DWU initiate stpt was reached. There are several units reacting different, but none ever bring on gas heat.
They all appear to be to stop economizing and start to warm up the space just on recirculation. Some actually show mode as DWU, others still show mode as cool, but close off OA and start recirculating.
Am I missing some setting in the unit or Tracer that is holding out the gas heat?
Any suggestions would be appreciated.