Standard on-off control of room humidity and air temperature, where staged on-off control of cooling and heating is required. This control package is intended for a residential and light commercial swimming pool applications, where remote monitoring is needed (Internet connected router required). This control package is limited to only Air Cooled - Non Water Heating Assist Models DCA650-DCA3300, DCA3500 and DCA4400.

Unit of Measure



  • Based on Honeywell THX9421 Prestige IAQ
  • Easy to use graphical interface
  • Remote access with RedLINK gateway (Internet connected router required)
  • Built in humidity and temperature sensors
  • Automatic changeover of set points
  • PID logic for temperature control
  • Adjustable set points and differentials
  • Configurable integral and derivative times
  • Sensor calibration

Package Components


  • DCA part number 413-004, which includes:
    • Honeywell THX9421R5021WW Thermostat
    • Honeywell THM5421R1021 Equipment Interface Module (EIM)
  • DCA part number 413-007 - Honeywell THM6000R1002 RedLINK Gateway Dimensions: 6 x 5 x 2.5 inches


N/A C7189R1004 Wireless indoor remote sensor - wall mount
Requires (2) AAA alkaline batteries (not included)
Dimensions: 2-7/8 x 1-7/8 x 15/16 inches

Technical Specifications

Thermostat Power Consumption

N/A ½ Brightness = 2.1 VABacklight off =1.9 VAFull Brightness = 3.0 VA

EIM Power Consumption

N/A 2.0 VA

RedLINK Communication

N/A Frequency: 900 MHz frequency range Re-Sync Time: RedLINK devices re-establish communication within 6 minutes after AC power resumes

Humidity Display Range

N/A 0% to 99% RH

Humidity Sensor Accuracy

N/A ± 5 % RH from 30% to 50% RH at 75 °F (24.0 °C)

Dehumidification Setting Range

N/A 40% to 80% RH

Temperature Sensor Accuracy

N/A ± 1.5 °F at 70 °F (0.75 °C at 21.0 °C)

Temperature Setting Range

N/A Cooling: 50 to 99°F (10 to 37°C) Heating: 40 to 90°F (4.5 to 32°C)