Honeywell T8400; T8401 Electronic Thermostats; T8411 Electronic Heat Pump Thermostat; T8424 Electronic Multistage Thermostat.
Electronic Thermostats provide temperature control for 24V heating-cooling systems, including multistage heat pump systems and multistage conventional systems, with manual changeover from heat to cool.
Attractive styling complements any decor.
Ease-of-use means fewer questions and increased satisfaction.
Large display for quick easy readability.
Keys are located by the display for easy access.
Fan and system switches are located on the lower edge to eliminate accidental setting changes.
Easy installation, setup and self-test saves installer time.
Manual changeover from heat to cool eliminates unexpected system operation.
T8400; T8401 for 1 stage heat, 1 stage cool.
T8411 for 2 stage heat, 1 stage cool.
T8424 for up to 2 stage heat, 2 stage cool.
Degree F or C temperature display for added model flexibility.
Selectable heating cycle rate for a variety of applications.
Cooling cycle rate is fixed (3 cph), the standard setting for compressors, for speedy installation.
Setpoints are permanently held in memory (no batteries used) and retained during power outages.
Description Electronic Thermostat
Application Cooling and electric heat systems
Terminal Designations R, W, Y, G
Accuracy (C) 0.5 C
Accuracy (F) 1 F
Dimensions (in.) 3 1/2 in. high, 3 1/2 in. wide, 1 3/16 in. deep, 3 1/2 in. high, 5 1/2 in. wide, 1 3/16 in. deep
Dimensions (mm) 89 mm high, 140 mm wide, 55 mm deep, 89 mm high, 89 mm wide, 55 mm deep
Setting Temperature Range (F) 40 F to 99 F
Setting Temperature Range (C) 4 C to 37 C
Electrical Ratings (Vac) 18 to 30 Vac
Cycles per Hour Adj. 1,3,4,5,6,9,12 depending on model
Currents (Cooling) .02 to 1.5A run; 7.5A inrush; 2nd stage 1.0A Max
Currents (Heating) .02 to 1.5A run; 7.5A inrush; 2nd stage 1.0A Max
Currents (Fan) .02 to .5A run; 2.5A inrush
Interstages Differential Temperature (C) .5 to .8 C Multistage models only
Interstages Differential Temperature (F) 1 to 1.5 F Multistage models only
Operating Range (C) 4 C to 43 C
Operating Range (F) 40 F to 110 F
Frequency (Hz) 60Hz or 50/60 Hz
Power Method Power-Stealing
Sensor Element THERMISTOR
Stages (cooling) 1
Stages (heating) 1
Switch Positions (Fan) AUTO-ON
Switch Positions (System) COOL-OFF-HEAT
Switch Type Electronic
Humidity Ratings (% RH) 5% RH to 90% RH, non-condensing
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