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EWC EWT-3900 - Wireless 7 Day or 5+3 Day Single Stage, Two Stage or Heat Pump Compatible

Item: EWT-3900
MFR: EWT-3900
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Model EWT-3900 Wireless Programmable Digital Thermostat.

  • Power: Thermostat - Rechargeable Lithium-Ion Battery (USB Charging Cable and Wall Charger included). Receiver - 19-30VAC 50/60 Hz from Class 2 Transformer.
  • Input Voltage: 19-30VAC 60 Hz Transformer 40 - 60VA MAX. NEC Class 2.
  • Current Draw: 260 mA @ 24VAC. Max load per terminal 1 amp.
  • Wireless Range: Up to 300 Feet (91 Meters). Concrete and steel will reduce range.
  • Wiring: 18 gauge Solid copper wire. Do not use Stranded or Shielded Cable.
  • Operation Conditions: Temperature: Operating Range - 30°F to 99°F. Storage Temp - 14°F to 140°F. Humidity: 0% - 90% RH Non-Condensing.
  • Compatible Equipment: Single or Two Stage Heating and Cooling Equipment - Gas, Electric, Oil, or Hydronic. One or Two Stage Compressor Heat Pump with Electric Backup Heat.

  • Programming: 7 Day or 5/2 Day Programming. Armchair Programming capable.
  • Auto-Changeover: Can be set for Auto or Manual Changeover.
  • Adjustable Temperature Range: Thermostat can be set between 45°F and 95°F.
  • Temperature Differential: The Temperature differential can be adjusted from 1°F to 3°F to adjust system cycling response. Default setting is 2°F.
  • Keypad Lockout: Capable of locking keypad for unauthorized changes.
  • Filter Monitor: Alerts you to change the filter after 400 hours of system run time.
  • Compatible Ultra-Zone Control Panels: NCM-300, BMPlus3000, or UZC4


NameEWC EWT-3900 - Wireless 7 Day or 5+3 Day Single Stage, Two Stage or Heat Pump Compatible
BrandEWC Controls
Gemaire Item NumberEWT-3900
Manufacturer Product NumberEWT-3900
SKU - PIM Number1369225537040
ERP Number245635
Unit of MeasureEACH
Weight3.0 Pound (lb.)
Length7.0 Inches (in)
Width5.0 Inches (in)
Height4.0 Inches (in)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginUSA
Voltage24 VAC
Electrical ConnectionScrew terminal
Electrical Rating19-30 VAC 60 HZ
Power Method24 V or Battery
Batteries IncludedYes
750mV CompatibleYes
Auto ChangeoverYes
Built In Wi-FiNo
Change/Check RemindersYes
Daylight Savings Time ReadyYes
Display OptionsFilter, system
Displays Outdoor TemperatureYes
Heat Pump CompatibleYes
Indoor Remote SensorNo
Low Battery IndicatorYes
Programmable FanNo
Stages Cool2
Stages Heat3
Temperature Settings per Day6
Vacation ModeYes
Battery BackupYes
Sensing ElementYes
Ambient Temperature Range20°F to 99°F (-6.6°C to 37.2°C)
Differential Temperature4°F
Dual Transformer CompatibleYes
Fan SwitchingYes
Mountingfree standing
Zone CapabilitySingle
Number of HVAC Zones1
Operating Temperature Range30°F to 99°F (-1.1°C to 37.2°C)
Removable InterfaceNo
Switch ActionRelay
System SwitchingYes
Temperature Range50°F to 99°F (10°C to 37.2°C)
Terminal DesignationsC,R,W1/E, W2, Y1, G,O, B
Warranty Offered5 Year
Energy Star RatedNo
Inside Depth1/4"
Inside Width3 3/4"
Inside Height4 3/4”
GEM - Case Quantity