Carrier 33CSSP3-FC - Copying Daily Program Settings

15
Troubleshooting
• SYMPTOM:Thethermostatdisplayashes‘Occupied1’whenrunningthe
program.
CAUSE:ThesensorconnectedtotheDryContactterminalsofthe
thermostat,isactive,forcingtheunitinto‘Occupied1’.
REMEDY: Verify proper wiring between the thermostat and the occupancy
sensor and verify that the wiring is not shorted. If no sensor is connected,
programtheDryContactpolarityforNormallyOpen(step#14,page21of
theOwner’sManual).
• SYMPTOM:ThethermostatwillonlyallowHeatorOin2-pipe
installations, even though chilled water is available.
CAUSE:Faulty,improperlywired,orimproperlyinstalledH2Ochangeover
sensor.
REMEDY:Conrmproperwiringofthechangeoversensor(betweenRand
H2O).Conrmproperplacementofthesensor(goodmechanicalcoupling
fortemperaturetransfer).Testthechangeoversensorasfollows:
 1.Removepowerfromthefancoilsystem.
 2.DisconnectthewirebetweenthesensorandtheH2Oterminal.
 3.PlaceanohmmeterbetweenRandthewirejustdisconnectedfrom
the sensor.
 4.Agoodsensorwillshowcontinuitywheneverthewatertemperature
  isconrmedtobeatorbelow65degrees.Ifthesensorisopenwhen
  thewatertemperatureisconrmedtobeatorbelow65,replace
the sensor.