Problem:
UC400 UV closing valves before going into unoccupied temperature control.
Unit vent in freeze avoidance mode. Fan off, oa damper closed, valves full open.
Sequence of operation for unoccupied heating control is that the space temp has to go 1.5 deg below the unoccupied heating setpt before opening up the heating valve and bringing on the fan.
Problem is the space temp drops below the unoccupied heating setpt and the heating and cooling valves close but the valve should remain full open until the space temp goes 1.5 deg F below the unoccupied heating setpt.
Heating and cooling valves should remain open for freeze avoidance until the space goes below 1.5 deg f below the unoccupied heating setpt and the unit heats.
Workaround:
Would have to write tgp2 routine to adjust the unoccupied heating setpt above the space temp by at least 1.5 deg f once the space temp was equal to the unoccupied heating setpt. Once the space temp reaches the original unoccupied heating setpt, release the unoccupied override.
Solution:
Workaround is the only solution until defect fix.
Status:
Defect #327394
TBD on when it will be fixed.