WT920 Embedded HVAC Controller Full Function Device

The WT920 is a conventionally wired embedded controller with up to 4 Stages of Cooling Control, modulating outputs for Economy Cycle Control, 1 Stage of Heating or Modulating Output, 2 Wired Thermistor Element Sensors and 2 Auxiliary Inputs. 24 VAC with ModBus interface through the WC21 Full Function Device which is supplied with the WT920.

Detailed Specifications   
RF  Full Function Device 
RF Classification802.15.4 ISM Band DeviceMesh FFD Capacity75 FFD’s
Frequency2.4 GHz 16 ChannelsLine of Sight Range1,400 Feet / 425 Meters
Network ArchitectureStar Mesh PAN Coordinator
Device ClassificationFull Function Device
Transmit Sensitivity12 dBm
Receive Sensitivity-94 dBm
Module HardwarePhysical
WC21 FFD ControllerSee WC21 Data SheetDimensions146 ” X 104 X 63 mm
WT 920 Embedded I/O Module24 VAC 25 VAWeight1 Lb
Control Transformer50 VA RecommendedPower ( Device Usage )25 VA @ 24VAC
Factory Wiring18 Ga 600V Insulation Comm CableCertificationsFCC
EnclosureNEMA 1 PolycarbonateOperating temp0 Deg F to 135 Deg F
BackplaneNoneStorage temp0 Deg F to 176 Deg F
CoverPolycarbonate Slip CoverOperating humidity5% to 95% (non condensing)
Exterior HardwareNoneStorage humidity5% to 95% (non condensing)
WT920 I/O Module DetailFunctional I/O on the WT920
WC21 Polling Rate350 msecCooling Outputs3  5 Amp 300 VAC
Minimum Update Interval10 SecondsHeating Outputs1  5 Amp 300 VAC
Maximum Update Interval3,600 SecondsAnalog Outputs2  0-10 VDC
WC21 On Board I/ONot Functional when 920 ConnectedAux Outputs1  5 Amp 300 VAC
Input Resolution10 BitThermistor Inputs2  10 K Ohm
Aux Inputs2  Contact Closure

Category Model number Item Description
FFD – CONTROL WT920 Star Mesh Network Full Function Multi Stage HVAC Controller

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