I have an AAON RTU (heat pump) with the wattmaster vcm controls on it. We are having an issue with the supply air temp as it is not resetting off of outside air and the unit is putting out 43* air, too cold for the reheats to overcome and the building is cold. We have a lon card tied in to to the comm port and the points all seem to read ok, I have integrated the site via a j700 with spyder controlled reheat vav's. I am experiencing a few issues.
1: I am not sure if we are adjusting the correct point over lon for the supply temp. I am using SaClSt set at 55* and the SaHtSt set at 75*. I have of course played with these settings with no difference. The unit does ok when it is hot out and controlls the cooling well.
2:The points are jumping around on UnitMode (from RemoteScheduleOverride to CurrentOutputForceMode) and the EconPos is jumping back and forth from 5% to 25%. The unit works fine as far as the Jace controlling the occupancy and the economizer is not actually driving back and forth as the point shows.
3:When we power the unit down and unplug the lon card from the com port and plug in the system manager, we are unable to communicate with the unit. The units systems id is 1 as verified on the comm board. If we do a connect it says something to the effect of unit not found, we get the same result if we do a loop scan.
Any assistance would be appreciated. I have not had luck with aaon tech support in the past but that will be my next call on Monday