7–37 T-354Figure 7.30 Return Sensor PositioningSensor STS/SRSReinstall the supply sensor as shown inFigure 7.31. For proper placement of the supply sensor, be sure to positionthe seal section of the sensor against the side of the mounting clamp.Figure 7.31 Supply Sensor PositioningSensor DTSThe DTS sensor must have insulating material placed completely over the sensor to insure the coil metal tempera-ture is sensed.7.24 VENT POSITION SENSOR (VPS)The vent position sensor (VPS) determines the position of the fresh air vent in near real-time via the function code 55.The fresh air VPS alarm (AL50) will occur if the sensor reading is not stable for five minutes or if the sensor is out-side of its valid range (shorted or open). This can occur if the vent is loose or the panel is defective. To confirm adefective panel, assure that the wing nut is secure and then power cycle the unit.The alarm should immediately go inactive. Check the four-minute stability requirement. If the alarm reoccurs afterthe four minutes and the panel was known to have been stable, then the panel should be replaced.If the alarm immediately reappears as active, the panel should be replaced.Cap and GrommetAssemblyProbeHolderReturn SensorSensorWiresReturnAirStreamEvaporatorBack Panel6mm(1/4--inch)Evaporator GrilleCombinationSensor (Mount inEither Clamp)MountingClampSeal
